10-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-K

ý ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2013

or

¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from to

Commission File Number: 1-13245

Pioneer Natural Resources Company

(Exact name of registrant as specified in its charter)

Delaware	75-2702753
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)
5205 N. O'Connor Blvd., Suite 200, Irving, Texas	75039
(Address of principal executive offices)	(Zip Code)

Registrant's telephone number, including area code: (972) 444-9001

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Name of each exchange on which registered
Common Stock, par value $.01	New York Stock Exchange

Securities registered pursuant to Section 12(g) of the Act: None

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.    Yes  ý    No  ¨

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.    Yes  ¨    No  ý

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  ý    No  ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  ý    No  ¨

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K (§229.405 of this chapter) is not contained herein, and will not be contained, to the best of registrant's knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer or a smaller reporting company. See the definitions of "large accelerated filer," "accelerated filer" and "smaller reporting company" in Rule 12b-2 of the Exchange Act.

Large accelerated filer	ý	Accelerated filer	o
Non-accelerated filer	o  (Do not check if a smaller reporting company)	Smaller reporting company	o

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act).     Yes   ¨    No   ý

Aggregate market value of the voting and non-voting common equity held by non-affiliates computed by reference to the price at which the common equity was last sold, or the average bid and asked price of such common equity, as of the last business day of the registrant's most recently completed second fiscal quarter	$	19,865,703,072
Number of shares of Common Stock outstanding as of February 20, 2014	142,916,619

DOCUMENTS INCORPORATED BY REFERENCE:

(1) Portions of the Definitive Proxy Statement for the Company's 2013 Annual Meeting of Shareholders to be held during May 2014 are incorporated into Part III of this report.

TABLE OF CONTENTS

		Page
Definitions of Certain Terms and Conventions Used Herein		4
Cautionary Statement Concerning Forward-Looking Statements		5
PART I
Item 1.	Business	6
	General	6
	Available Information	6
	Mission and Strategies	6
	Business Activities	6
	Marketing of Production	9
	Competition, Markets and Regulations	10
Item 1A.	Risk Factors	17
Item 1B.	Unresolved Staff Comments	30
Item 2.	Properties	30
	Reserve Estimation Procedures and Audits	30
	Proved Reserves	33
	Description of Properties	34
	Selected Oil and Gas Information	38
Item 3.	Legal Proceedings	43
Item 4.	Mine Safety Disclosures	43
PART II
Item 5.	Market for Registrant's Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities	44
	Purchases of Equity Securities by the Issuer and Affiliated Purchasers	44
Item 6.	Selected Financial Data	45
Item 7.	Management's Discussion and Analysis of Financial Condition and Results of Operations	46
	Financial and Operating Performance	46
	First Quarter 2014 Outlook	47
	2014 Capital Budget	47
	Acquisitions	48
	Divestitures and Discontinued Operations	48
	Results of Operations	49
	Capital Commitments, Capital Resources and Liquidity	56
	Critical Accounting Estimates	60
	New Accounting Pronouncements	62
Item 7A.	Quantitative and Qualitative Disclosures About Market Risk	63
	Quantitative Disclosures	63
	Qualitative Disclosures	66
Item 8.	Financial Statements and Supplementary Data	67
	Index to Consolidated Financial Statements	67
	Report of Independent Registered Public Accounting Firm	68
	Consolidated Financial Statements	69
	Notes to Consolidated Financial Statements	76
	Unaudited Supplementary Information	114
Item 9.	Changes in and Disagreements With Accountants on Accounting and Financial Disclosure	124
Item 9A.	Controls and Procedures	124
	Management's Report on Internal Control Over Financial Reporting	124
	Report of Independent Registered Public Accounting Firm	125
Item 9B.	Other Information	126

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TABLE OF CONTENTS

PART III
Item 10.	Directors, Executive Officers and Corporate Governance	126
Item 11.	Executive Compensation	126
Item 12.	Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters	126
	Securities Authorized for Issuance Under Equity Compensation Plans	126
Item 13.	Certain Relationships and Related Transactions, and Director Independence	127
Item 14.	Principal Accounting Fees and Services	127
PART IV
Item 15.	Exhibits, Financial Statement Schedules	127
Signatures		134
Exhibit Index		136

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Definitions of Certain Terms and Conventions Used Herein

Within this Report, the following terms and conventions have specific meanings:

• "BBL" means a standard barrel containing 42 United States gallons.

• "BCF" means one billion cubic feet.

• "BOE" means a barrel of oil equivalent and is a standard convention used to express oil and gas volumes on a comparable oil equivalent basis. Gas equivalents are determined under the relative energy content method by using the ratio of six thousand cubic feet of gas to one BBL of oil or natural gas liquid.

• "BOEPD"means BOE per day.

• "BTU" means British thermal unit, which is a measure of the amount of energy required to raise the temperature of one pound of water one degree Fahrenheit.

• "CBM" means coal bed methane.

• "Conway"means the daily average natural gas liquids components as priced in Oil Price Information Services ("OPIS") in the table "U.S. and Canada LP – Gas Weekly Averages" at Conway, Kansas.

• "DD&A" means depletion, depreciation and amortization.

• "Proved developed reserves" mean reserves that can be expected to be recovered through existing wells with existing equipment and operating methods or in which the cost of the required equipment is relatively minor compared to the cost of a new well.

• "Field fuel" means gas consumed to operate field equipment (primarily compressors) prior to the gas being delivered to a sales point.

• "GAAP" means accounting principles that are generally accepted in the United States of America.

• "LIBOR" means London Interbank Offered Rate, which is a market rate of interest.

• "MBBL" means one thousand BBLs.

• "MBOE" means one thousand BOEs.

• "MCF" means one thousand cubic feet and is a measure of gas volume.

• "MMBBL" means one million BBLs.

• "MMBOE" means one million BOEs.

• "MMBTU" means one million BTUs.

• "MMCF"means one million cubic feet.

• "Mont Belvieu" means the daily average natural gas liquids components as priced in OPIS in the table "U.S. and Canada LP – Gas Weekly Averages" at Mont Belvieu, Texas.

• "NGL" means natural gas liquid.

• "NYMEX" means the New York Mercantile Exchange.

• "NYSE" means the New York Stock Exchange.

• "Pioneer" or the "Company" means Pioneer Natural Resources Company and its subsidiaries.

• "Pioneer Southwest" means Pioneer Southwest Energy Partners L.P. and its subsidiaries.

• "Proved reserves" mean the quantities of oil and gas, which, by analysis of geosciences and engineering data, can be estimated with reasonable certainty to be economically producible – from a given date forward, from known reservoirs, and under existing economic conditions, operating methods, and government regulations – prior to the time at which contracts providing the right to operate expire, unless evidence indicates that renewal is reasonably certain, regardless of whether deterministic or probabilistic methods are used for the estimation. The project to extract the hydrocarbons must have commenced or the operator must be reasonably certain that it will commence the project within a reasonable time.

(i) The area of the reservoir considered as proved includes: (A) The area identified by drilling and limited by fluid contacts, if any, and (B) Adjacent undrilled portions of the reservoir that can, with reasonable certainty, be judged to be continuous with it and to contain economically producible oil or gas on the basis of available geoscience and engineering data.

(ii) In the absence of data on fluid contacts, proved quantities in a reservoir are limited by the lowest known hydrocarbons ("LKH") as seen in a well penetration unless geoscience, engineering, or performance data and reliable technology establishes a lower contact with reasonable certainty.

(iii) Where direct observation from well penetrations has defined a highest known oil ("HKO") elevation and the potential exists for an associated gas cap, proved oil reserves may be assigned in the structurally higher portions of the reservoir only if geoscience, engineering or performance data and reliable technology establish the higher contact with reasonable certainty.

4

(iv) Reserves which can be produced economically through application of improved recovery techniques (including, but not limited to, fluid injection) are included in the proved classification when: (A) Successful testing by a pilot project in an area of the reservoir with properties no more favorable than in the reservoir as a whole, the operation of an installed program in the reservoir or an analogous reservoir, or other evidence using reliable technology establishes the reasonable certainty of the engineering analysis on which the project or program was based; and (B) The project has been approved for development by all necessary parties and entities, including governmental entities.

(v) Existing economic conditions include prices and costs at which economic producibility from a reservoir is to be determined. The price shall be the average during the 12-month period prior to the ending date of the period covered by the report, determined as an unweighted arithmetic average of the first-day-of-the-month price for each month within such period, unless prices are defined by contractual arrangements, excluding escalations based upon future conditions.

• "SEC" means the United States Securities and Exchange Commission.

• "Standardized Measure"means the after-tax present value of estimated future net cash flows of proved reserves, determined in accordance with the rules and regulations of the SEC, using prices and costs employed in the determination of proved reserves and a ten percent discount rate.

• "Proved undeveloped reserves"means reserves that are expected to be recovered from new wells on undrilled acreage, or from existing wells where a relatively major expenditure is required for recompletion.

(i) Reserves on undrilled acreage shall be limited to those directly offsetting development spacing areas that are reasonably certain of production when drilled, unless evidence using reliable technology exists that establishes reasonable certainty of economic producibility at greater distances.

(ii) Undrilled locations can be classified as having proved undeveloped reserves only if a development plan has been adopted indicating that they are scheduled to be drilled within five years, unless the specific circumstances, justify a longer time.

(iii) Under no circumstances shall estimates for proved undeveloped reserves be attributable to any acreage for which an application of fluid injection or other improved recovery technique is contemplated, unless such techniques have been proved effective by actual projects in the same reservoir or an analogous reservoir, or by other evidence using reliable technology establishing reasonable certainty.

• "U.S." means United States.

• "VPP" means volumetric production payment.

• "WTI" means West Texas intermediate, a light, sweet blend of oil produced from fields in western Texas.

• With respect to information on the working interest in wells, drilling locations and acreage, "net" wells, drilling locations and acres are determined by multiplying "gross" wells, drilling locations and acres by the Company's working interest in such wells, drilling locations or acres. Unless otherwise specified, wells, drilling locations and acreage statistics quoted herein represent gross wells, drilling locations or acres.

• Unless otherwise indicated, all currency amounts are expressed in U.S. dollars.

CAUTIONARY STATEMENT CONCERNING FORWARD-LOOKING STATEMENTS

This Annual Report on Form 10-K (this "Report") contains forward-looking statements that involve risks and uncertainties. When used in this document, the words "believes," "plans," "expects," "anticipates," "forecasts," "intends," "continue," "may," "will," "could," "should," "future," "potential," "estimate," or the negative of such terms and similar expressions as they relate to the Company are intended to identify forward-looking statements, which are generally not historical in nature. The forward-looking statements are based on the Company's current expectations, assumptions, estimates and projections about the Company and the industry in which the Company operates. Although the Company believes that the expectations and assumptions reflected in the forward-looking statements are reasonable as and when made, they involve risks and uncertainties that are difficult to predict and, in many cases, beyond the Company's control. In addition, the Company may be subject to currently unforeseen risks that may have a materially adverse effect on it. Accordingly, no assurances can be given that the actual events and results will not be materially different from the anticipated results described in the forward-looking statements. See "Item 1. Business — Competition, Markets and Regulations," "Item 1A. Risk Factors," "Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations" and "Item 7A. Quantitative and Qualitative Disclosures About Market Risk" for a description of various factors that could materially affect the ability of Pioneer to achieve the anticipated results described in the forward-looking statements. Readers are cautioned not to place undue reliance on forward-looking statements, which speak only as of the date hereof. The Company undertakes no duty to publicly update these statements except as required by law.

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PIONEER NATURAL RESOURCES COMPANY

PART I

ITEM 1. BUSINESS

General

The Company is a large independent oil and gas exploration and production company with operations in the United States. Pioneer is a holding company whose assets consist of direct and indirect ownership interests in, and whose business is conducted substantially through, its subsidiaries. Pioneer's common stock is listed and traded on the NYSE under the ticker symbol "PXD."

The Company is a Delaware corporation formed in 1997. The Company's executive offices are located at 5205 N. O'Connor Blvd., Suite 200, Irving, Texas 75039. The Company's telephone number is (972) 444-9001. The Company maintains other offices in Anchorage, Alaska; Denver, Colorado; and Midland, Texas. At December 31, 2013, the Company had 4,203 employees, 1,985 of whom were employed in other field and plant operations and 894 of whom were employed in vertical integration activities.

Available Information

Pioneer files or furnishes annual, quarterly and current reports, proxy statements and other documents with the SEC under the Securities Exchange Act of 1934 (the "Exchange Act"). The public may read and copy any materials that Pioneer files with the SEC at the SEC's Public Reference Room at 100 F Street, N.E., Washington, D.C. 20549. The public may obtain information on the operation of the Public Reference Room by calling the SEC at 1-800-SEC-0330. Also, the SEC maintains an Internet website that contains reports, proxy and information statements, and other information regarding issuers, including Pioneer, that file electronically with the SEC. The public can obtain any documents that Pioneer files with the SEC at http://www.sec.gov.

The Company also makes available free of charge through its internet website (www.pxd.com) its Annual Reports on Form 10-K, Quarterly Reports on Form 10-Q, Current Reports on Form 8-K and, if applicable, amendments to those reports filed or furnished pursuant to Section 13(a) of the Exchange Act as soon as reasonably practicable after it electronically files such material with, or furnishes it to, the SEC.

Mission and Strategies

The Company's mission is to enhance shareholder investment returns through strategies that maximize Pioneer's long-term profitability and net asset value. The strategies employed to achieve this mission are predicated on maintaining financial flexibility, capital allocation discipline and enhancing net asset value through accretive drilling programs, joint ventures and acquisitions. These strategies are anchored by the Company's interests in the long-lived Spraberry/Wolfcamp oil field; the liquid-rich Eagle Ford Shale play; the Hugoton and West Panhandle fields; and the Raton gas field; which together have an estimated remaining productive life in excess of 40 years. Underlying these fields are 92 percent of the Company's total proved oil and gas reserves as of December 31, 2013.

Business Activities

The Company is an independent oil and gas exploration and production company. Pioneer's purpose is to competitively and profitably explore for, develop and produce oil and gas reserves. In so doing, the Company sells homogenous oil, NGL and gas units that, except for geographic and relatively minor quality differences, cannot be significantly differentiated from units offered for sale by the Company's competitors. Competitive advantage is gained in the oil and gas exploration and development industry by employing well-trained and experienced personnel who make prudent capital investment decisions based on management direction, embrace technological innovation and are focused on price and cost management.

Petroleum industry. North American oil prices have been fairly consistent during the past three years despite the significant increase in United States oil production from unconventional shale plays. The growth in North American oil production has been offset by reduced oil imports, keeping supply and demand fairly balanced. Continued oil production growth in United States from unconventional shale plays is expected to outpace the decline in oil imports and increase oil price volatility. The growth of unconventional shale drilling has also substantially increased the supply of NGLs, resulting in a significant decline in NGL component prices as the supply of such products has grown. While more export facilities have been built and NGL exports are increasing, the overall United States demand for NGL products has not kept pace with the remaining supply of such products; consequently, prices for NGL products have generally declined over the past three years. North American gas prices have remained

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PIONEER NATURAL RESOURCES COMPANY

volatile and they trended lower from 2009 through 2012, but improved steadily throughout 2013. The decline in North American gas prices was primarily a result of significant discoveries of gas and associated gas reserves in United States gas, oil and liquid-rich shale plays, combined with the warmer than normal recent winters, which resulted in gas storage levels being at historically high levels, and minimal economic demand growth in the United States. The increases in gas prices during 2013 were primarily related to reduced drilling activity in gas shale plays and demand increases in the latter part of the year as a result of colder weather.

Oil prices continue to be primarily driven by world supply and demand fundamentals; however, recent increases in United States oil, NGL and gas production volumes from the Permian Basin, Eagle Ford, Bakken and Marcellus areas have been met with lower demand, higher storage levels and pipeline, gas plant and NGL fractionation infrastructure capacity limitations, which has led to a reduction in United States NYMEX oil, NGL and gas prices compared to international prices for similar commodities, including Brent oil prices.

Since 2010, the economies in the United States and certain other countries have continued to stabilize with resulting improvements in industrial demand and consumer confidence. However, other economies, such as those of certain European and Asian nations, continue to face economic struggles or slowing economic growth. While the outlook for a continued worldwide economic recovery remains cautiously optimistic, it is still uncertain; therefore, the sustainability of the recovery in worldwide demand for energy is difficult to predict. As a result, the Company believes it is likely that commodity prices will continue to be volatile during 2014.

Significant factors that will affect 2014 commodity prices include: the ongoing effect of economic stimulus initiatives; fiscal challenges facing the United States federal government and potential changes to the tax laws in the United States; continuing economic struggles in European and Asian nations; political and economic developments in North Africa and the Middle East; demand from Asian and European markets; the extent to which members of the Organization of Petroleum Exporting Countries ("OPEC") and other oil exporting nations are able to manage oil supply through export quotas; the capacity of United States refiners to absorb increasing domestic supplies of oil and condensate; potential export regulatory changes in the United States; the supply and demand fundamentals for NGLs in the United States and the pace at which export capacity grows; and overall North American gas supply and demand fundamentals, including refilling gas storage that is anticipated to be lower than normal at the end of the winter draw season.

Pioneer uses commodity derivative contracts to mitigate the effect of commodity price volatility on the Company's net cash provided by operating activities and its net asset value. Although the Company has entered into commodity derivative contracts for a large portion of its forecasted production through 2015, a sustained lower commodity price environment would result in lower realized prices for unprotected volumes and reduce the prices at which the Company could enter into derivative contracts on additional volumes in the future. As a result, the Company's internal cash flows would be reduced for affected periods. A sustained decline in commodity prices could result in a shortfall in expected cash flows, which could negatively affect the Company's liquidity, financial position and future results of operations. See "Item 7A. Quantitative and Qualitative Disclosures About Market Risk" and Note E of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for information regarding the Company's open derivative positions as of December 31, 2013.

The Company. The Company's growth plan is primarily anchored by horizontal drilling in the Spraberry/Wolfcamp oil field located in West Texas and the liquid-rich Eagle Ford Shale field located in South Texas. Complementing these growth areas, the Company has oil and gas production activities and development opportunities in the Raton gas field located in southern Colorado, the Hugoton gas and liquid field located in southwest Kansas, the West Panhandle gas and liquid field located in the Texas Panhandle and the Edwards gas field located in South Texas. Combined, these assets create a portfolio of resources and opportunities that are well balanced and diversified among oil, NGL and gas, and that are also well balanced among long-lived, dependable production and lower-risk exploration and development opportunities. The Company has a team of dedicated employees who represent the professional disciplines and sciences that the Company believes are necessary to allow Pioneer to maximize the long-term profitability and net asset value inherent in its physical assets.

Production. The Company focuses its efforts towards maximizing its average daily production of oil, NGLs and gas through development drilling, production enhancement activities and acquisitions of producing properties, while minimizing the controllable costs associated with the production activities. For the year ended December 31, 2013, the Company's production from continuing operations of 58.9 MMBOE, excluding field fuel usage, represented a 12 percent increase over production from continuing operations during 2012. Production, price and cost information with respect to the Company's properties for 2013, 2012 and 2011 is set forth in "Item 2. Properties — Selected Oil and Gas Information — Production, price and cost data."

Development activities. The Company seeks to increase its proved oil and gas reserves, production and cash flow through development drilling and by conducting other production enhancement activities, such as well recompletions. During the three years ended December 31, 2013, the Company drilled 1,850 gross (1,655 net) development wells, 99 percent of which were successfully completed as productive wells, at a total drilling cost (net to the Company's interest) of $4.8 billion.

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PIONEER NATURAL RESOURCES COMPANY

The Company believes that its current property base provides a substantial inventory of prospects for future reserve, production and cash flow growth. The Company's proved reserves as of December 31, 2013 include proved undeveloped reserves and proved developed reserves that are behind pipe of 102.5 MMBBLs of oil, 41.9 MMBBLs of NGLs and 328.9 BCF of gas. The Company believes that its proved reserves represent a significant portfolio of development opportunities. The timing of the development of these reserves will be dependent upon commodity prices, drilling and operating costs and the Company's expected operating cash flows and financial condition.

Exploratory activities. The Company has devoted significant efforts and resources to hiring and developing a highly skilled geoscience staff as well as acquiring a significant portfolio of lower-risk exploration opportunities that are expected to be evaluated and tested over the next decade and beyond. Exploratory and extension drilling involve greater risks of dry holes or failure to find commercial quantities of hydrocarbons than development drilling or enhanced recovery activities. See "Item 1A. Risk Factors — Exploration and development drilling may not result in commercially productive reserves" below.

Integrated services. The Company continues to expand its integrated services to control drilling and operating costs and support the execution of its drilling program and operating activities. The Company has Company-owned fracture stimulation fleets totaling approximately 300,000 horsepower supporting drilling operations in the Spraberry/Wolfcamp and Eagle Ford Shale areas. The Company also owns other field service equipment, including pulling units, fracture stimulation tanks, water transport trucks, hot oilers, blowout preventers, construction equipment and fishing tools. In April 2012, Pioneer acquired a large U.S. industrial sands company, which was renamed Premier Silica (see Note C of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for more information about the acquisition of Premier Silica). That acquisition secured a high-quality, low-cost and logistically advantaged brown sand supply for Pioneer to use for its growing fracture stimulation requirements in the Spraberry field.

Acquisition activities. The Company regularly seeks to acquire properties that complement its operations, provide exploration and development opportunities and potentially provide superior returns on investment. In addition, the Company pursues strategic acquisitions that will allow the Company to expand into new geographical areas that provide future exploration/exploitation opportunities. During 2013, 2012 and 2011, the Company spent $76.0 million, $157.5 million and $131.9 million, respectively, to purchase primarily undeveloped acreage for future exploitation and exploration activities.

In addition, on December 17, 2013, the Company completed the acquisition of all of the outstanding common units of Pioneer Southwest not already owned by the Company, through a merger of a wholly-owned subsidiary of the Company into Pioneer Southwest, the result of which was that Pioneer Southwest became a wholly-owned subsidiary of the Company. The Pioneer Southwest merger was effected pursuant to an Agreement and Plan of Merger dated August 9, 2013, as amended on October 25, 2013 (as amended, the "Merger Agreement"), and was approved by the holders of the common units of Pioneer Southwest at a special meeting held on December 17, 2013. Pursuant to the Merger Agreement, all of the common units outstanding as of the closing of the merger were canceled and converted into the right to receive 0.2325 of a share of common stock of the Company per common unit. In December 2013 the Company issued an aggregate of 3.96 million shares of its common stock to Pioneer Southwest unitholders. The merger is expected to facilitate the Company's plans to fully and optimally develop the Company's Spraberry/Wolfcamp properties in the Midland Basin in West Texas utilizing horizontal drilling and is expected to enhance the Company's organizational, operational and administrative efficiencies.

The Company periodically evaluates and pursues acquisition opportunities (including opportunities to acquire particular oil and gas assets or entities owning oil and gas assets and opportunities to engage in mergers, consolidations or other business combinations with such entities) and at any given time may be in various stages of evaluating such opportunities. Such stages may take the form of internal financial analyses, oil and gas reserve analyses, due diligence, the submission of indications of interest, preliminary negotiations, negotiation of letters of intent or negotiation of definitive agreements. The success of any acquisition is uncertain and depends on a number of factors, some of which are outside the Company's control. See "Item 1A. Risk Factors — The Company may be unable to make attractive acquisitions and any acquisition it completes is subject to substantial risks that could adversely affect its business."

Asset divestitures and discontinued operations. The Company regularly reviews its asset base for the purpose of identifying nonstrategic assets, the disposition of which would increase capital resources available for other activities and create organizational and operational efficiencies. While the Company generally does not dispose of assets solely for the purpose of reducing debt, such dispositions can have the result of furthering the Company's objective of increasing financial flexibility through reduced debt levels.

During the fourth quarter of 2013, the Company committed to a plan to sell 100 percent of the capital stock in Pioneer's Alaska subsidiary, representing all the Company's net assets in Alaska ("Pioneer Alaska"). The sale of Pioneer Alaska continues to be subject to ongoing negotiations and certain other conditions, such as governmental approvals and buyer's arrangement of financing. Associated with the planned sale of Pioneer Alaska, the Company recorded a noncash impairment charge of $539.8

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PIONEER NATURAL RESOURCES COMPANY

million during December 2013 to reduce the carrying value of Pioneer Alaska to its estimated fair value less costs to sell of $350.6 million. The Company has classified Pioneer Alaska assets and liabilities as held for sale in the accompanying consolidated balance sheet as of December 31, 2013 and has reported Pioneer Alaska's historical results of operations, and the related impairment loss, as discontinued operations, net of tax in the Company's accompanying consolidated statements of operations.

During the fourth quarter of 2013, the Company also committed to a plan to divest of its net assets in the Barnett Shale field in North Texas. The plan is expected to result in the sale of the Barnett Shale net assets during 2014. Associated with the plan to sell the Company's net assets in the Barnett Shale field, the Company recorded a noncash impairment charge of $189.5 million during December 2013 to reduce the carrying value of the Barnett Shale field net assets to their estimated fair value less costs to sell. The Company has classified Barnett Shale assets and liabilities as held for sale in the accompanying consolidated balance sheet as of December 31, 2013 and has reported Barnett Shale historical results of operations, and the related impairment loss, as discontinued operations, net of tax in the Company's accompanying consolidated statements of operations.

During December 2013, the Company committed to a plan to sell its majority interest in Sendero Drilling Company, LLC ("Sendero"), the Company's vertical drilling rig subsidiary, to Sendero's minority interest owner for $31.0 million, subject to negotiating a definitive sales agreement and the buyer completing its financing arrangements. Associated with the planned sale of Sendero, the Company recorded a noncash loss of $25.5 million during December 2013 to reduce the carrying value of Sendero's net assets to their estimated fair value. As part of the sales negotiations, the Company plans to commit to lease 12 Sendero rigs through December 31, 2015 and to lease eight Sendero rigs in 2016. The Company has classified Sendero assets and liabilities as held for sale in the accompanying consolidated balance sheet as of December 31, 2013.

The Company's plans to sell Pioneer Alaska, the Barnett Shale net assets and Sendero are in various stages of marketing or negotiation. No assurance can be given that the sales will be completed in accordance with the Company's plans.

In January 2013, the Company signed an agreement with Sinochem Petroleum USA LLC ("Sinochem"), a U.S. subsidiary of the Sinochem Group, an unaffiliated third party, to sell 40 percent of Pioneer's interest in 207,000 net acres leased by the Company in the horizontal Wolfcamp Shale play in the southern portion of the Spraberry field for consideration of $1.8 billion. In May 2013, the Company completed the sale to Sinochem for net cash proceeds of $623.8 million, resulting in a gain of $181.3 million related to the unproved property interests conveyed to Sinochem. Sinochem is paying the remaining $1.2 billion of the transaction price by carrying 75 percent of Pioneer's portion of ongoing drilling and facilities costs attributable to the Company's joint operations with Sinochem in the horizontal Wolfcamp Shale play.

During December 2011, the Company committed to a plan to exit South Africa and initiated a process to divest its net assets in South Africa ("Pioneer South Africa"). During the first quarter of 2012, the Company agreed to sell Pioneer South Africa to an unaffiliated third party, effective January 1, 2012, for $60.0 million of cash proceeds before normal closing and other adjustments, and the buyer's assumption of certain liabilities of the Company's South Africa subsidiaries. In August 2012, the Company completed the sale of Pioneer South Africa for net cash proceeds of $15.9 million, including normal closing adjustments for cash revenues and costs and expenses from the effective date through the date of the sale, resulting in a gain of $28.6 million. The Company classified Pioneer South Africa's results of operations as discontinued operations, net of tax in the accompanying consolidated statements of operations.

In February 2011, the Company sold 100 percent of the Company's share holdings in Pioneer Natural Resources Tunisia Ltd. and Pioneer Natural Resources Anaguid Ltd. (referred to in the aggregate as "Pioneer Tunisia") to an unaffiliated third party for cash proceeds of $802.5 million, excluding cash and cash equivalents sold, resulting in a gain of $645.2 million. The Company classified the results of operations of Pioneer Tunisia as discontinued operations, net of tax in the accompanying consolidated statements of operations.

The Company anticipates that it will continue to sell nonstrategic properties or other assets from time to time to increase capital resources available for other activities, to achieve operating and administrative efficiencies and to improve profitability. See Note C of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for specific information regarding the Company's asset divestitures and discontinued operations. Also see "Item1A. Risk Factors - The Company's ability to complete dispositions of assets, or interests in assets, may be subject to factors beyond its control, and in certain cases the Company may be required to retain liabilities for certain matters" for discussion of risk factors associated with the completion of divestitures.

Marketing of Production

General. Production from the Company's properties is marketed using methods that are consistent with industry practices. Sales prices for oil, NGL and gas production are negotiated based on factors normally considered in the industry, such as an index or spot price, price regulations, distance from the well to the pipeline, commodity quality and prevailing supply and demand

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conditions. See "Item 7A. Quantitative and Qualitative Disclosures About Market Risk" for additional discussion of operations and price risk.

Significant purchasers. During 2013, the Company's significant purchasers of oil, NGLs and gas were Plains Marketing LP (26 percent), Enterprise Products Partners L.P. (12 percent) and Occidental Energy Marketing Inc. (12 percent). The Company believes that the loss of a significant purchaser or an inability to secure adequate pipeline, gas plant and NGL fractionation infrastructure in its key producing areas could have a material adverse effect on its ability to sell its oil, NGL and gas production. See "Item 1A. Risk Factors" and Note L of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for more information about significant customer and infrastructure capacity risks.

Derivative risk management activities. The Company primarily utilizes commodity swap contracts, collar contracts and collar contracts with short puts to (i) reduce the effect of price volatility on the commodities the Company produces and sells or consumes, (ii) support the Company's annual capital budgeting and expenditure plans and (iii) reduce commodity price risk associated with certain capital projects. The Company also, from time to time, utilizes interest rate contracts to reduce the effect of interest rate volatility on the Company's indebtedness. The Company accounts for its derivative contracts using the mark-to-market ("MTM") method of accounting. See "Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations" for a description of the Company's derivative risk management activities, "Item 7A. Quantitative and Qualitative Disclosures About Market Risk," and Note E of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for information about the impact of commodity derivative activities on oil, NGL and gas revenues and net derivative gains and losses during 2013, 2012 and 2011, as well as the Company's open commodity derivative positions at December 31, 2013.

Competition, Markets and Regulations

Competition. The oil and gas industry is highly competitive. A large number of companies, including major integrated and other independent companies, and individuals engage in the exploration for and development of oil and gas properties, and there is a high degree of competition for oil and gas properties suitable for development or exploration. Acquisitions of oil and gas properties have been an important element of the Company's growth. The Company intends to continue acquiring oil and gas properties that complement its operations, provide exploration and development opportunities and potentially provide superior returns on investment. The principal competitive factors in the acquisition of oil and gas properties include the staff and data necessary to identify, evaluate and acquire such properties and the financial resources necessary to acquire and develop the properties. Some of the Company's competitors are substantially larger and have financial and other resources greater than those of the Company.

Markets. The Company's ability to produce and market oil, NGLs and gas profitably depends on numerous factors beyond the Company's control. The effect of these factors cannot be accurately predicted or anticipated. Although the Company cannot predict the occurrence of events that may affect these commodity prices or the degree to which these prices will be affected, the prices for any commodity that the Company produces will generally approximate current market prices in the geographic region of the production.

Securities regulations. Enterprises that sell securities in public markets are subject to regulatory oversight by agencies such as the SEC and the NYSE. This regulatory oversight imposes on the Company the responsibility for establishing and maintaining disclosure controls and procedures and internal controls over financial reporting, and ensuring that the financial statements and other information included in submissions to the SEC do not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made in such submissions not misleading. Failure to comply with the rules and regulations of the SEC could subject the Company to litigation from public or private plaintiffs. Failure to comply with the rules of the NYSE could result in the de-listing of the Company's common stock, which would have an adverse effect on the market price and liquidity of the Company's common stock. Compliance with some of these rules and regulations is costly, and regulations are subject to change or reinterpretation.

Environmental and occupational health and safety matters. The Company's operations are subject to stringent and complex federal, state and local laws and regulations governing environmental protection, worker health and safety, and the discharge of materials into the environment. Numerous governmental entities, including the U.S. Environmental Protection Agency (the "EPA") and analogous state agencies have the power to enforce compliance with these laws and regulations and the permits issued under them, often requiring difficult and costly actions to achieve and maintain compliance and imposing sanctions, including administrative, civil and criminal penalties, for any failure to comply.

These laws and regulations may, among other things:

• require the acquisition of various permits before drilling or other regulated activity commences;

• enjoin some or all of the operations of facilities deemed in noncompliance with permits;

• restrict the types, quantities and concentration of various substances that can be released into the environment in connection with oil and gas drilling, production and transportation activities;

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PIONEER NATURAL RESOURCES COMPANY

• limit or prohibit drilling activities on certain lands lying within wilderness, wetlands and other protected areas;

• impose specific criteria addressing worker protection;

• require remedial measures to mitigate pollution from former and ongoing operations, such as requirements to close pits and plug abandoned wells; and

• impose substantial liabilities for pollution resulting from operations.

These laws and regulations may also restrict the rate of oil and gas production below the rate that would otherwise be possible. The regulatory burden on the oil and gas industry increases the cost of doing business in the industry and consequently affects profitability. Additionally, the U.S. Congress, state legislatures and federal and state regulatory agencies frequently revise environmental laws and regulations, and the trend in environmental regulation is to place more restrictions and limitations on activities that may affect the environment. Any changes that result in more stringent and costly drilling, completion, construction or water management activities, or waste handling, disposal and cleanup requirements for the oil and gas industry could have a significant effect on the Company's capital and operating costs.

The following is a summary of some of the more significant laws and regulations to which the Company's business operations are or may be subject.

Waste handling. The federal Resource Conservation and Recovery Act ("RCRA") and comparable state statutes regulate the generation, transportation, treatment, storage, disposal and cleanup of hazardous and non-hazardous wastes. Under the auspices of the EPA, the individual states administer some or all of the provisions of RCRA, sometimes in conjunction with their own, more stringent requirements. Drilling fluids, produced waters and most of the other wastes associated with the exploration, development and production of oil or gas are currently regulated under RCRA's non-hazardous waste provisions. It is possible that certain oil and gas exploration and production wastes now classified as non-hazardous could be classified as hazardous wastes in the future. Any such change could result in an increase in the Company's costs to manage and dispose of wastes, which could have a material adverse effect on the Company's results of operations and financial position. In the course of its operations, the Company generates some amounts of ordinary industrial wastes, such as paint wastes, waste solvents and waste oils that may be regulated as hazardous wastes.

Wastes containing naturally occurring radioactive materials ("NORM") may also be generated in connection with the Company's operations. NORM is subject primarily to individual state radiation control regulations. In addition, NORM handling and management activities are governed by regulations promulgated by the Occupational Safety and Health Administration ("OSHA"). These state and OSHA regulations impose certain requirements concerning worker protection, with respect to NORM, the treatment, storage and disposal of NORM waste, the management of waste piles, containers and tanks containing NORM and restrictions on the uses of land with NORM contamination.

Comprehensive Environmental Response, Compensation, and Liability Act. The federal Comprehensive Environmental Response, Compensation and Liability Act ("CERCLA"), also known as the Superfund law, and analogous state laws impose joint and several liability, without regard to fault or legality of conduct, on classes of persons who are considered to be responsible for the release of a "hazardous substance" into the environment. These persons include the current and past owner or operator of the site where the release occurred, and anyone who disposed or arranged for the disposal of a hazardous substance released at the site. Under CERCLA, such persons may be subject to joint and several liability for the costs of cleaning up the hazardous substances that have been released into the environment, for damages to natural resources and for the costs of certain health studies. CERCLA also authorizes the EPA and, in some instances, third parties to act in response to threats to the public health or the environment and to seek to recover from the responsible classes of persons the costs they incur. In addition, it is not uncommon for neighboring landowners and other third-parties to file claims for personal injury and property damage allegedly caused by the hazardous substances released into the environment.

The Company currently owns or leases numerous properties that have been used for oil and gas exploration and production for many years. Although the Company believes it has used operating and waste disposal practices that were standard in the industry at the time, hazardous substances, wastes or petroleum hydrocarbons may have been released on or under the properties owned or leased by the Company, or on or under other locations, including off-site locations, where such substances have been taken for recycling or disposal. In addition, some of the Company's properties have been operated by previous owners or operators whose treatment and disposal of hazardous substances, wastes or petroleum hydrocarbons were not under the Company's control. Certain of these properties have had historical petroleum spills or releases. All of such properties and the substances disposed or released on them may be subject to CERCLA, RCRA and analogous state laws. Under such laws, the Company could be required to remove previously disposed substances and wastes, remediate contaminated property or perform remedial plugging or pit closure operations to prevent future contamination. If a surface spill or release were to occur, the Company expects that it would be controlled, contained and remediated in accordance with the applicable requirements of state oil and gas commissions and by using the Company's spill prevention, control and countermeasure ("SPCC") plans or other spill or emergency contingency plans that it maintains in accordance with EPA requirements.

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PIONEER NATURAL RESOURCES COMPANY

Water discharges and use. The federal Water Pollution Control Act, also known as the Clean Water Act (the "CWA"), and analogous state laws impose restrictions and strict controls with respect to the discharge of pollutants, including spills and leaks of oil and other substances, into waters of the United States and state waters. The discharge of pollutants into regulated waters is prohibited, except in accordance with the terms of a permit issued by the EPA or an analogous state agency. The CWA and regulations implemented thereunder also prohibit the discharge of dredge and fill material into regulated waters, including wetlands, unless authorized by an appropriately issued permit. SPCC planning requirements of federal laws require appropriate containment berms and similar structures to help prevent the contamination of navigable waters by a petroleum hydrocarbon tank spill, rupture or leak. Federal and state regulatory agencies can impose administrative, civil and criminal penalties for noncompliance with discharge permits or other requirements of the CWA and analogous state laws and regulations.

The primary federal law imposing liability for oil spills is the Oil Pollution Act ("OPA"), which sets minimum standards for prevention, containment and cleanup of oil spills. OPA applies to vessels, offshore facilities and onshore facilities, including exploration and production facilities that may affect waters of the United States. Under OPA, responsible parties, including owners and operators of onshore facilities, may be subject to oil spill cleanup costs and natural resource damages as well as a variety of public and private damages that may result from oil spills. If an oil spill subject to the requirements of OPA were to occur at a Company property, the Company expects that it would be controlled, contained and remediated in accordance with the applicable requirements of OPA and by using the Company's OPA spill response plan together with the assistance of trained first responders and any oil spill response contractor that the Company would have engaged pursuant to OPA to address such oil spills.

Operations associated with the Company's properties also produce wastewaters that are disposed by injection in underground wells. These injection wells are regulated by the federal Safe Drinking Water Act (the "SDWA") and analogous state and local laws. The underground injection well program under the SDWA requires permits from the EPA or analogous state agency for the Company's disposal wells, establishes minimum standards for injection well operations, and restricts the types and quantities of fluids that may be injected. Currently, the Company believes that disposal well operations on the Company's properties substantially comply with all applicable requirements under the SDWA. However, a change in the regulations or the inability to obtain permits for new injection wells in the future may affect the Company's ability to dispose of produced waters and ultimately increase the cost of the Company's operations. For example, in some areas of Texas, there has been concern that certain formations into which disposal wells are injecting produced waters could become over-pressured after many years of injection, and the governing Texas regulatory agency is reviewing the data to determine whether any action is necessary to address this issue. If the Texas state agency were to decline to issue permits for new injection wells into the formations currently utilized by the Company, the Company may be required to seek alternative methods of disposing of produced waters, including injecting into deeper formations, which could increase its costs. In addition, in response to recent seismic events near underground injection wells used for the disposal of wastewaters, some federal and state agencies have been investigating whether such wells have caused increased seismic activity. It is possible that federal or state agencies will seek to regulate more stringently the underground injection of oil and gas wastewaters as a result of these events. Nevertheless, the Company is not aware of any imminent actions by federal or state agencies that would affect its use or operation of underground injection wells due to the concern about seismic activity.

The Company also uses hydraulic fracturing techniques in virtually all of its drilling and completion programs and development of its properties is dependent on the Company's ability to hydraulically fracture the producing formations. The process involves the injection of water, sand and additives under pressure into targeted subsurface formations to stimulate oil and gas production. The process is typically regulated by state oil and gas commissions, but, the EPA has asserted federal regulatory authority over hydraulic fracturing involving diesel fuels under the SDWA Underground Injection Control Program and published final permitting guidance in February 2014 addressing the performance of such activities. In 2011, the EPA announced its intent to develop and issue regulations under the Toxic Substances Control Act to require companies to disclose information regarding the chemicals used in hydraulic fracturing, and in its Semi-annual Regulatory Agenda published in July 2013, the agency continues to project the future issuance of an Advance Notice of Proposed Rulemaking that would seek public input on the design and scope of such disclosure regulations. The EPA published final rules under the federal Clean Air Act ("CAA") that, among other things, require producers to reduce volatile organic compound emissions from certain subcategories of fractured and refractured gas wells for which well completion operations are being conducted by routing flowback emissions to a gathering line or capturing and combusting flowback emissions using a combustion device, such as a flare, until January 1, 2015 and performing reduced emission completions, also known as "green completions," with or without combustion devices, on or after January 1, 2015. Also, in May 2013, the federal Bureau of Land Management (the "BLM") published a supplemental notice of proposed rulemaking governing hydraulic fracturing on federal and Indian oil and gas leases that would require public disclosure of chemicals used in hydraulic fracturing, confirmation that wells used in fracturing operations meet appropriate construction standards, and development of appropriate plans for managing flowback water that returns to the surface. In addition, the U.S. Congress, from time to time, has considered adopting legislation intended to provide for federal regulation of hydraulic fracturing and to require disclosure of the chemicals used in the hydraulic-fracturing process.

Certain states in which the Company operates, including Colorado and Texas, have adopted, and other states are considering adopting, regulations that could impose new or more stringent permitting, disclosure and well-construction requirements on

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PIONEER NATURAL RESOURCES COMPANY

hydraulic fracturing operations. In addition to state laws, local land use restrictions, such as city ordinances, may restrict or prohibit drilling in general or hydraulic fracturing in particular. The Company believes that it follows applicable standard industry practices and legal requirements for groundwater protection in its hydraulic fracturing activities. Nonetheless, in the event federal, state or local restrictions are adopted in areas where the Company is currently conducting, or in the future plans to conduct operations, the Company may incur additional costs to comply with such requirements that may be significant in nature, experience delays or curtailment in the pursuit of exploration, development or production activities, and be limited or precluded in the drilling of wells or in the amounts that the Company is ultimately able to produce from its reserves.

Certain governmental reviews were recently conducted or are underway that focus on environmental aspects of hydraulic fracturing practices. The White House Council on Environmental Quality is coordinating an administration-wide review of hydraulic fracturing practices. The EPA has commenced a study of the potential environmental effects of hydraulic fracturing on drinking water and groundwater and a draft report is expected to be available for public comments and peer review in 2014. Moreover, the EPA is developing effluent limitations for the treatment and discharge of wastewater resulting from hydraulic fracturing activities and is expected to propose these standards in 2014. These studies, or future studies, depending on their degree of pursuit and any meaningful results obtained, could spur initiatives to further regulate hydraulic fracturing under the SDWA or other regulatory mechanisms.

The water produced by the Company's CBM operations also may be subject to the state laws and regulations of regulatory bodies regarding the ownership and use of water. For example, in connection with the Company's CBM operations in the Raton Basin in Colorado, water is removed from coal seams to reduce pressure and allow the methane to be recovered. Historically, these operations have been regulated by the state agency responsible for regulating oil and gas activity in the state. Nevertheless, in 2009, the Colorado Supreme Court affirmed a state court holding that water produced in connection with the CBM operations should be subject to state water-use regulations administered by a different agency that regulates other uses of water in the state, including requirements to obtain permits for diversion and use of surface and subsurface water, an evaluation of potential competing uses of the water, and a possible requirement to provide mitigation water for other water users. The Colorado legislature and state agency adopted laws and regulations in response to this ruling. These and other resulting changes in the regulation of water produced from CBM operations may have an adverse effect on the costs of doing business and the ability to expand operations by the Company or other CBM producers.

Air emissions. The CAA and comparable state laws regulate emissions of various air pollutants through air emissions permitting programs and the imposition of other requirements. Such laws and regulations may require a facility to obtain pre-approval for the construction or modification of certain projects or facilities expected to produce air emissions or result in the increase of existing air emissions; obtain or strictly comply with air permits containing various emissions and operational limitations; or utilize specific emission control technologies to limit emissions of certain air pollutants. In addition, the EPA has developed, and continues to develop, stringent regulations governing emissions of toxic air pollutants at specified sources. Moreover, states may impose their own air emissions limitations, which may be more stringent than the federal standards imposed by the EPA. Federal and state regulatory agencies can also impose administrative, civil and criminal penalties for noncompliance with air permits or other requirements of the CAA and associated state laws and regulations. The adoption of laws, regulations, orders or other legally enforceable mandates governing oil and gas drilling and operating activities in the areas where the Company conducts business that result in more stringent drilling or operating conditions or limit or prohibit the drilling of new wells for any extended period of time could increase the Company's costs or reduce its production, which could have a material adverse effect on the Company's results of operations and cash flows.

Permits and related compliance obligations under the CAA, as well as changes to state implementation plans for controlling air emissions in regional non-attainment areas, may require the Company to incur future capital expenditures in connection with the addition or modification of existing air emission control equipment and strategies for oil and gas exploration and production operations. For example, in 2012, the EPA published final rules under the CAA that subject oil and gas production, processing, transmission and storage operations to regulation under the New Source Performance Standards and National Emission Standards for Hazardous Air Pollutants programs. With regard to production activities, these final rules require, among other things, the reduction of volatile organic compound emissions from three subcategories of fractured and refractured gas wells for which well completion operations are conducted: wildcat (exploratory) and delineation gas wells; low reservoir pressure non-wildcat and non-delineation gas wells; and all "other" fractured and refractured gas wells. All three subcategories of wells must route flowback emissions to a gathering line or capture and combust flowback emissions using a combustion device, such as a flare. However, the "other" wells must use reduced emission completions, also known as "green completions," with or without combustion devices, on or after January 1, 2015. These regulations also establish specific new requirements regarding emissions from production-related wet seal and reciprocating compressors, effective October 15, 2012 and from pneumatic controllers and storage vessels, beginning as early as October 15, 2013. Compliance with these requirements could increase the Company's costs of development and production, which costs could be significant.

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PIONEER NATURAL RESOURCES COMPANY

Endangered species. The federal Endangered Species Act (the "ESA") and analogous state laws regulate activities that could have an adverse effect on threatened or endangered species. Some of the Company's operations are conducted in areas where protected species or their habitats are known to exist. In these areas, the Company may be obligated to develop and implement plans to avoid potential adverse effects to protected species and their habitats, and the Company may be prohibited from conducting operations in certain locations or during certain seasons, such as breeding and nesting seasons, when the Company's operations could have an adverse effect on the species. It is also possible that a federal or state agency could order a complete halt to drilling activities in certain locations if it is determined that such activities may have a serious adverse effect on a protected species. The presence of a protected species in areas where the Company performs activities could result in increased costs or limitations on the Company's ability to perform operations and thus have an adverse effect on the Company's business.

Moreover, as a result of a settlement approved by the U.S. District Court for the District of Columbia in September 2011, the U.S. Fish and Wildlife Service is required to make a determination on the potential listing of numerous species as endangered or threatened under the ESA before completion of the agency's 2017 fiscal year. The designation of previously unprotected species as threatened or endangered in areas where the Company operates could cause the Company to incur increased costs arising from species protection measures or could result in limitations on the Company's drilling and production activities that could have an adverse effect on the Company's ability to develop and produce its proved reserves.

Activities on Federal Lands. Oil and gas exploration, development and production activities on federal lands, including Indian lands and lands administered by the BLM, are subject to the National Environmental Policy Act, as amended ("NEPA"). NEPA requires federal agencies, including the BLM, to evaluate major agency actions having the potential to significantly impact the environment. In the course of such evaluations, an agency will prepare an Environmental Assessment that assesses the potential direct, indirect and cumulative impacts of a proposed project and, if necessary, will prepare a more detailed Environmental Impact Statement that may be made available for public review and comment. Currently, the Company has minimal exploration and production activities on federal lands.However, for those current activities as well as for future or proposed exploration and development plans on federal lands, governmental permits or authorizations that are subject to the requirements of NEPA are required. This process has the potential to delay or limit, or increase the cost of, the development of oil and gas projects. Authorizations under NEPA are also subject to protest, appeal or litigation, any or all of which may delay or halt projects.

Occupational health and safety. The Company's operations are subject to the requirements of OSHA and comparable state statutes. These laws and the related regulations strictly govern the protection of the health and safety of employees. The OSHA hazard communication standard, EPA community right-to-know regulations under Title III of CERCLA and similar state statues require that the Company organize or disclose information about hazardous materials used or produced in the Company's operations. In addition, the Company's sand mining operations are subject to the Federal Mine Safety and Health Act of 1977, as amended by the Mine Improvement and New Emergency Response Act of 2006, which imposes stringent health and safety standards on numerous aspects of mineral extraction and processing operations, including the training of personnel, operating procedures, operating equipment and other matters. The Company believes that it is in substantial compliance with these applicable standards and with OSHA and comparable requirements.

Climate change. In 2009, the EPA published its findings that emissions of carbon dioxide, methane and other greenhouse gases ("GHGs") present an endangerment to public health and the environment because emissions of such gases are, according to the EPA, contributing to warming of the Earth's atmosphere and other climatic changes. Based on these findings, the EPA has adopted regulations under the CAA establishing Title V and Prevention of Significant Deterioration ("PSD") permitting requirements for large sources of GHGs. The Company could become subject to these permitting requirements and be required to install "best available control technology" to limit emissions of GHGs from any new or significantly modified facilities that the Company may seek to construct in the future if they would otherwise emit large volumes of GHGs. The EPA has also adopted rules requiring the reporting of GHG emissions on an annual basis from specified GHG emission sources in the United States, including certain oil and gas production facilities, which includes certain of the Company's facilities. The Company is monitoring GHG emissions from its operations in accordance with these GHG emissions reporting rules and believes its monitoring activities are in substantial compliance with applicable reporting obligations.

While the U.S. Congress has from time to time considered legislation to reduce emissions of GHGs, there has not been significant activity in the form of adopted legislation to reduce GHG emissions at the federal level in recent years. In the absence of federal climate legislation in the United States, a number of state and regional efforts have emerged that are aimed at tracking or reducing GHG emissions by means of cap and trade programs that typically require major sources of GHG emissions, such as electric power plants, to acquire and surrender emission allowances in return for emitting those GHGs. If the U.S. Congress undertakes comprehensive tax reform in the coming year, it is possible that such reform may include a carbon tax, which could impose additional direct costs on the Company's operations.

Although it is not possible at this time to predict how legislation or new regulations that may be adopted to address GHG emissions would affect the Company's business, any such future laws and regulations could require the Company to incur increased

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PIONEER NATURAL RESOURCES COMPANY

operating costs, such as costs to purchase and operate emissions control systems, acquire emissions allowances or comply with new regulatory or reporting requirements including the imposition of a carbon tax. Any such legislation or regulatory programs could also increase the cost to the consumer, and thereby reduce demand for oil and gas, which could reduce the demand for the oil and gas the Company produces. Consequently, legislation and regulatory programs to reduce emissions of GHGs could have an adverse effect on the Company's business, financial condition and results of operations.

Some scientists have concluded that increasing concentrations of GHGs in the Earth's atmosphere may produce climate changes that have significant physical effects, such as increased frequency and severity of storms, droughts, floods and other climatic events. If any such effects were to occur, they could have an adverse effect on the Company's financial condition and results of operations.

Other regulation of the oil and gas industry. The oil and gas industry is regulated by numerous federal, state and local authorities. Legislation affecting the oil and gas industry is under constant review for amendment or expansion, frequently increasing the regulatory burden. Also, numerous federal and state departments and agencies are authorized by statute to issue rules and regulations binding on the oil and gas industry and its individual members, some of which carry substantial penalties for failure to comply. Although the regulatory burden on the oil and gas industry may increase the Company's cost of doing business by increasing the cost of production, the Company believes that these burdens generally do not affect the Company any differently or to any greater or lesser extent than they affect other companies in the industry with similar types, quantities and locations of production.

Development and production. Development and production operations are subject to various types of regulation at federal, state and local levels. These types of regulation include requiring permits for the drilling of wells, the posting of bonds in connection with various types of activities and filing reports concerning operations. Most states, and some counties and municipalities, in which the Company operates also regulate one or more of the following:

• the location of wells;

• the method of drilling and casing wells;

• the method and ability to fracture stimulate wells;

• the surface use and restoration of properties upon which wells are drilled;

• the plugging and abandoning of wells; and

• notice to surface owners and other third parties.

State laws regulate the size and shape of drilling and spacing units or proration units governing the pooling of oil and gas properties. Some states allow forced pooling or integration of tracts to facilitate development while other states rely on voluntary pooling of lands and leases. In some instances, forced pooling or unitization may be implemented by third parties and may reduce the Company's interest in the unitized properties. In addition, state conservation laws establish maximum rates of production from oil and gas wells, generally prohibit the venting or flaring of gas and impose requirements regarding the ratability of production. These laws and regulations may limit the amount of oil and gas the Company can produce from the Company's wells or limit the number of wells or the locations at which the Company can drill. Moreover, each state generally imposes a production or severance tax with respect to the production and sale of oil, NGL and gas within its jurisdiction. States do not regulate wellhead prices or engage in other similar direct regulation, but there can be no assurance that they will not do so in the future. The effect of such future regulations may be to limit the amounts of oil and gas that may be produced from the Company's wells, negatively affect the economics of production from these wells, or limit the number of locations the Company can drill.

Regulation of transportation and sale of gas. The availability, terms and cost of transportation significantly affect sales of gas. Federal and state regulations govern the price and terms for access to gas pipeline transportation. Intrastate gas pipeline transportation activities are subject to various state laws and regulations, as well as orders of state regulatory bodies. The interstate transportation and sale of gas is subject to federal regulation, including regulation of the terms, conditions and rates for interstate transportation, storage and various other matters, primarily by the Federal Energy Regulatory Commission ("FERC"). FERC endeavors to make gas transportation more accessible to gas buyers and sellers on an open-access and non-discriminatory basis.

Pursuant to the Energy Policy Act of 2005 ("EPAct 2005") it is unlawful for "any entity," including producers such as the Company, that are otherwise not subject to FERC's jurisdiction under the Natural Gas Act (the "NGA"), to use any deceptive or manipulative device or contrivance in connection with the purchase or sale of gas or the purchase or sale of transportation services subject to regulation by FERC, in contravention of rules prescribed by FERC. FERC's rules implementing this provision make it unlawful, in connection with the purchase or sale of gas subject to the jurisdiction of FERC, or the purchase or sale of transportation services subject to the jurisdiction of FERC, for any entity, directly or indirectly, to use or employ any device, scheme or artifice to defraud; to make any untrue statement of material fact or omit to make any such statement necessary to make the statements made not misleading; or to engage in any act or practice that operates as a fraud or deceit upon any person. EPAct 2005 also gives FERC authority to impose civil penalties of up to $1.0 million per day for each violation of the NGA or the Natural Gas Policy

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PIONEER NATURAL RESOURCES COMPANY

Act of 1978. The anti-manipulation rule applies to activities of entities not otherwise subject to FERC's jurisdiction to the extent the activities are conducted "in connection with" gas sales, purchases or transportation subject to FERC jurisdiction, which includes the annual reporting requirements under Order 704 (defined below).

In December 2007, FERC issued a final rule on the annual gas transaction reporting requirements, as amended by subsequent orders on rehearing ("Order 704"). Under Order 704, any market participant, including a producer such as the Company, that engages in wholesale sales or purchases of gas that equal or exceed 2.2 million MMBTUs of physical gas in the previous calendar year must annually report such sales and purchases to FERC on Form No. 552 on May 1 of each year. Form No. 552 contains aggregate volumes of gas purchased or sold at wholesale in the prior calendar year to the extent such transactions utilize, contribute to or may contribute to the formation of price indices. It is the responsibility of the reporting entity to determine which individual transactions should be reported based on the guidance of Order 704. Order 704 is intended to increase the transparency of the wholesale gas markets and to assist FERC in monitoring those markets and in detecting market manipulation.

Additional proposals and proceedings that might affect the gas industry are considered from time to time by the U.S. Congress, FERC, state regulatory bodies and the courts. The Company cannot predict when or if any such proposals might become effective or their effect, if any, on its operations. The Company does not believe that it will be affected by any action taken in a materially different way than other gas producers, gatherers and marketers with which it competes.

Natural gas processing. The Company's gas processing operations are not subject to FERC or state regulation. There can be no assurance that the Company's processing operations will continue to be exempt from regulation in the future. However, although the processing facilities may not be directly related, other laws and regulations may affect the availability of gas for processing, such as state regulation of production rates and maximum daily production allowable from gas wells, which could impact the Company's processing business.

Gas gathering. Section 1(b) of the NGA exempts gas gathering facilities from FERC's jurisdiction. The Company believes that its gathering facilities meet the traditional tests FERC has used to establish a pipeline system's status as a non-jurisdictional gatherer. There is, however, no bright-line test for determining the jurisdictional status of pipeline facilities. Moreover, the distinction between FERC-regulated transmission services and federally unregulated gathering services is the subject of litigation from time to time, so the classification and regulation of some of the Company's gathering facilities may be subject to change based on future determinations by FERC and the courts. Thus, the Company cannot guarantee that the jurisdictional status of its gas gathering facilities will remain unchanged.

While the Company owns or operates some gas gathering facilities, the Company also depends on gathering facilities owned and operated by third parties to gather production from its properties, and therefore the Company is affected by the rates charged by these third parties for gathering services. To the extent that changes in federal or state regulation affect the rates charged for gathering services, the Company also may be affected by these changes. Accordingly, the Company does not anticipate that the Company would be affected any differently than similarly situated gas producers.

Regulation of transportation and sale of oil and NGLs. The liquids industry is also extensively regulated by numerous federal, state and local authorities. In a number of instances, the ability to transport and sell such products on interstate pipelines is dependent on pipelines whose rates, terms and conditions of service are subject to FERC jurisdiction under the Interstate Commerce Act (the "ICA"). The Company does not believe these regulations affect it any differently than other producers.

The ICA requires that pipelines maintain a tariff on file with FERC. The tariff sets forth the established rates as well as the rules and regulations governing the service. The ICA requires, among other things, that rates and terms and conditions of service on interstate common carrier pipelines be "just and reasonable." Such pipelines must also provide jurisdictional service in a manner that is not unduly discriminatory or unduly preferential. Shippers have the power to challenge new and existing rates and terms and conditions of service before FERC.

Rates of interstate liquids pipelines are currently regulated by FERC primarily through an annual indexing methodology, under which pipelines increase or decrease their rates in accordance with an index adjustment specified by FERC. For the five-year period beginning in 2010, FERC established an annual index adjustment equal to the change in the producer price index for finished goods plus 2.65 percent. This adjustment is subject to review every five years. Under FERC's regulations, a liquids pipeline can request a rate increase that exceeds the rate obtained through application of the indexing methodology by using a cost-of-service approach, but only after the pipeline establishes that a substantial divergence exists between the actual costs experienced by the pipeline and the rates resulting from application of the indexing methodology. Increases in liquids transportation rates may result in lower revenue and cash flows for the Company.

In addition, due to common carrier regulatory obligations of liquids pipelines, capacity must be prorated among shippers in an equitable manner in the event there are nominations in excess of capacity by current shippers or capacity requests are received from a new shipper. Therefore, new shippers or increased volume by existing shippers may reduce the capacity available to the

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PIONEER NATURAL RESOURCES COMPANY

Company. Any prolonged interruption in the operation or curtailment of available capacity of the pipelines that the Company relies upon for liquids transportation could have a material adverse effect on its business, financial condition, results of operations and cash flows. However, the Company believes that access to liquids pipeline transportation services generally will be available to it to the same extent as to its similarly-situated competitors.

Intrastate liquids pipeline transportation rates are subject to regulation by state regulatory commissions. The basis for intrastate liquids pipeline regulation, and the degree of regulatory oversight and scrutiny given to intrastate liquids pipeline rates, varies from state to state. The Company believes that the regulation of liquids pipeline transportation rates will not affect its operations in any way that is materially different from the effects on its similarly-situated competitors.

In November 2009, the Federal Trade Commission ("FTC") issued regulations pursuant to the Energy Independence and Security Act of 2007 intended to prohibit market manipulation in the petroleum industry. Violators of the regulations face civil penalties of up to $1.0 million per violation per day. In July 2010, the U.S. Congress passed the Dodd-Frank Wall Street Reform and Consumer Protection Act, which incorporated an expansion of the authority of the Commodity Futures Trading Commission ("CFTC") to prohibit market manipulation in the markets regulated by the CFTC. This authority, with respect to oil swaps and futures contracts, is similar to the anti-manipulation authority granted to the FERC with respect to anti-manipulation in the gas industry and the FTC with respect to oil purchases and sales, as described above. In July 2011, the CFTC issued final rules to implement their new anti-manipulation authority. The rules subject violators to a civil penalty of up to the greater of $1.0 million or triple the monetary gain to the person for each violation.

Energy commodity prices. Sales prices of oil, condensate, NGLs and gas are not currently regulated and are made at market prices. Although prices of these energy commodities are currently unregulated, the U.S. Congress historically has been active in their regulation. The Company cannot predict whether new legislation to regulate oil and gas might actually be enacted by the U.S. Congress or the various state legislatures, and what effect, if any, the proposals might have on the Company's operations.

Transportation of hazardous materials. The federal Department of Transportation has adopted regulations requiring that certain entities transporting designated hazardous materials develop plans to address security risks related to the transportation of hazardous materials. The Company does not believe that these requirements will have an adverse effect on the Company or its operations. The Company cannot provide any assurance that the security plans required under these regulations would protect against all security risks and prevent an attack or other incident related to the Company's transportation of hazardous materials.

ITEM 1A. RISK FACTORS

The nature of the business activities conducted by the Company subjects it to certain hazards and risks. The following is a summary of some of the material risks relating to the Company's business activities. Other risks are described in "Item 1. Business — Competition, Markets and Regulations," "Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations" and "Item 7A. Quantitative and Qualitative Disclosures About Market Risk." These risks are not the only risks facing the Company. The Company's business could also be affected by additional risks and uncertainties not currently known to the Company or that it currently deems to be immaterial. If any of these risks actually occurs, it could materially harm the Company's business, financial condition or results of operations and impair the Company's ability to implement business plans or complete development activities as scheduled. In that case, the market price of the Company's common stock could decline.

The prices of oil, NGL and gas are highly volatile. A sustained decline in these commodity prices could adversely affect the Company's financial condition and results of operations.

The Company's revenues, profitability, cash flow and future rate of growth are highly dependent on commodity prices. Commodity prices may fluctuate widely in response to relatively minor changes in the supply of and demand for oil, NGL and gas, market uncertainty and a variety of additional factors that are beyond the Company's control, such as:

• domestic and worldwide supply of and demand for oil, NGL and gas;

• inventory levels at Cushing, Oklahoma, the benchmark for WTI oil prices;

• oil, NGL and gas inventory levels in the United States;

• the capacity of U.S. refiners to absorb increasing domestic supplies of oil and condensate;

• weather conditions;

• overall domestic and global political and economic conditions, including laws, regulations and administrative policies that restrict the export of the Company's products;

• actions of OPEC, its members and other state-controlled oil companies relating to oil price and production controls;

• the effect of liquefied natural gas deliveries to and exports from the United States;

• technological advances affecting energy consumption and energy supply;

• domestic and foreign governmental regulations and taxation;

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PIONEER NATURAL RESOURCES COMPANY

• the effect of energy conservation efforts;

• the proximity, capacity, cost and availability of pipelines and other transportation facilities; and

• the price and availability of alternative fuels.

In the past, commodity prices have been extremely volatile, and the Company expects this volatility to continue. For example, during 2013, oil prices fluctuated from a low of $86.68 per BBL in April to a high of $110.53 per BBL in September, while gas prices fluctuated from a low of $3.11 per MCF in January to a high of $4.46 per MCF in December. During 2012, oil prices fluctuated from a high of $109.77 per BBL in February to a low of $77.69 per BBL in June, while gas prices fluctuated from a low of $1.91 per MCF in April to a high of $3.90 per MCF in November. The Company makes price assumptions that are used for planning purposes, and a significant portion of the Company's cash outlays, including rent, salaries and noncancelable capital commitments, are largely fixed in nature. Accordingly, if commodity prices are below the expectations on which these commitments were based, the Company's financial results are likely to be adversely and disproportionately affected because these cash outlays are not variable in the short term and cannot be quickly reduced to respond to unanticipated decreases in commodity prices.

Significant or extended price declines could also adversely affect the amount of oil, NGL and gas that the Company can produce economically. A reduction in production could result in a shortfall in expected cash flows and require the Company to reduce capital spending or borrow funds to cover any such shortfall. Any of these factors could negatively affect the Company's ability to replace its production and its future rate of growth.

The Company could experience periods of higher costs if commodity prices rise. These increases could reduce the Company's profitability, cash flow and ability to complete development activities as planned.

Historically, the Company's capital and operating costs have risen during periods of increasing oil, NGL and gas prices. These cost increases result from a variety of factors beyond the Company's control, such as increases in the cost of electricity, steel and other raw materials that the Company and its vendors rely upon; increased demand for labor, services and materials as drilling activity increases; and increased taxes. Increased levels of drilling activity in the oil and gas industry in recent periods have led to increased costs of some drilling equipment, materials and supplies. Such costs may rise faster than increases in the Company's revenue, thereby negatively impacting the Company's profitability, cash flow and ability to complete development activities as scheduled and on budget. This impact may be magnified to the extent that the Company's ability to participate in the commodity price increases is limited by its derivative risk management activities.

The Company's derivative risk management activities could result in financial losses.

To mitigate the effect of commodity price volatility on the Company's net cash provided by operating activities, support the Company's annual capital budgeting and expenditure plans and reduce commodity price risk associated with certain capital projects, the Company's strategy is to enter into derivative arrangements covering a portion of its oil, NGL and gas production. These derivative arrangements are subject to MTM accounting treatment, and the changes in fair market value of the contracts are reported in the Company's statements of operations each quarter, which may result in significant noncash gains or losses. These derivative contracts may also expose the Company to risk of financial loss in certain circumstances, including when:

• production is less than the contracted derivative volumes;

• the counterparty to the derivative contract defaults on its contract obligations; or

• the derivative contracts limit the benefit the Company would otherwise receive from increases in commodity prices.

On the other hand, failure to protect against declines in commodity prices exposes the Company to reduced liquidity when prices decline.

The failure by counterparties to the Company's derivative risk management activities to perform their obligations could have a material adverse effect on the Company's results of operations.

The use of derivative risk management transactions involves the risk that the counterparties will be unable to meet the financial terms of such transactions. If any of these counterparties were to default on its obligations under the Company's derivative arrangements, such a default could have a material adverse effect on the Company's results of operations, and could result in a larger percentage of the Company's future production being subject to commodity price changes.

Exploration and development drilling may not result in commercially productive reserves.

Drilling involves numerous risks, including the risk that no commercially productive oil or gas reservoirs will be encountered. The cost of drilling, completing and operating wells is often uncertain and drilling operations may be curtailed, delayed or canceled, or become costlier, as a result of a variety of factors, including:

• unexpected drilling conditions;

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PIONEER NATURAL RESOURCES COMPANY

• unexpected pressure or irregularities in formations;

• equipment failures or accidents;

• fracture stimulation accidents or failures;

• adverse weather conditions;

• restricted access to land for drilling or laying pipelines; and

• access to, and the cost and availability of, the equipment, services, resources and personnel required to complete the Company's drilling, completion and operating activities.

The Company's future drilling activities may not be successful and, if unsuccessful, such failure could have an adverse effect on the Company's future results of operations and financial condition. While all drilling, whether developmental, extension or exploratory, involves these risks, exploratory and extension drilling involves greater risks of dry holes or failure to find commercial quantities of hydrocarbons. The Company expects that it will continue to experience exploration and abandonment expense in 2014.

Future price declines could result in a reduction in the carrying value of the Company's proved oil and gas properties, which could adversely affect the Company's results of operations.

Declines in commodity prices may result in the Company having to make substantial downward adjustments to its estimated proved reserves. If this occurs, or if the Company's estimates of production or economic factors change, accounting rules may require the Company to impair, as a noncash charge to earnings, the carrying value of the Company's oil and gas properties. The Company is required to perform impairment tests on proved oil and gas properties whenever events or changes in circumstances indicate that the carrying value of proved properties may not be recoverable. To the extent such tests indicate a reduction of the estimated useful life or estimated future cash flows of the Company's oil and gas properties, the carrying value may not be recoverable and therefore an impairment charge would be required to reduce the carrying value of the proved properties to their fair value. For example, during 2013, 2012 and 2011, the Company recognized impairment charges of $1.5 billion, $532.6 million and $354.4 million, respectively, due to the impairment of the Company's Raton field, Barnett Shale field, and Edwards and Austin Chalk gas fields in South Texas, respectively, due to declines in long-term gas prices and downward adjustments to the economically recoverable resource potential. The Company may incur impairment charges in the future, which could materially affect the Company's results of operations in the period incurred.

The Company periodically evaluates its unproved oil and gas properties and could be required to recognize noncash charges in the earnings of future periods.

At December 31, 2013, the Company carried unproved oil and gas property costs of $123.4 million. GAAP requires periodic evaluation of these costs on a project-by-project basis. These evaluations are affected by the results of exploration activities, commodity price outlooks, planned future sales or expiration of all or a portion of the leases, and contracts and permits appurtenant to such projects. If the quantity of potential reserves determined by such evaluations is not sufficient to fully recover the cost invested in each project, the Company will recognize noncash charges in the earnings of future periods.

The Company periodically evaluates its goodwill for impairment and could be required to recognize noncash charges in the earnings of future periods.

At December 31, 2013, the Company carried goodwill of $274.3 million. Goodwill is assessed for impairment annually during the third quarter and whenever facts or circumstances indicate that the carrying value of the Company's goodwill may be impaired, which may require an estimate of the fair values of the reporting unit's assets and liabilities. Those assessments may be affected by (a) additional reserve adjustments both positive and negative, (b) results of drilling activities, (c) management's outlook for commodity prices and costs and expenses, (d) changes in the Company's market capitalization, (e) changes in the Company's weighted average cost of capital and (f) changes in income taxes. If the fair value of the reporting unit's net assets is not sufficient to fully support the goodwill balance in the future, the Company will reduce the carrying value of goodwill for the impaired value, with a corresponding noncash charge to earnings in the period in which goodwill is determined to be impaired.

The Company may be unable to make attractive acquisitions, and any acquisition it completes is subject to substantial risks that could adversely affect its business.

Acquisitions of producing oil and gas properties have from time to time contributed to the Company's growth. The Company's growth following the full development of its existing property base could be impeded if it is unable to acquire additional oil and gas reserves on a profitable basis. Acquisition opportunities in the oil and gas industry are very competitive, which can increase the cost of, or cause the Company to refrain from, completing acquisitions. The success of any acquisition will depend on a number of factors and involves potential risks, including among other things:

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PIONEER NATURAL RESOURCES COMPANY

• the inability to estimate accurately the costs to develop the reserves, the recoverable volumes of reserves, rates of future production and future net cash flows attainable from the reserves;

• the assumption of unknown liabilities, losses or costs for which the Company is not indemnified or for which the indemnity the Company receives is inadequate;

• the validity of assumptions about costs, including synergies;

• the effect on the Company's liquidity or financial leverage of using available cash or debt to finance acquisitions;

• the diversion of management's attention from other business concerns; and

• an inability to hire, train or retain qualified personnel to manage and operate the Company's growing business and assets.

All of these factors affect whether an acquisition will ultimately generate cash flows sufficient to provide a suitable return on investment. Even though the Company performs a review of the properties it seeks to acquire that it believes is consistent with industry practices, such reviews are often limited in scope. As a result, among other risks, the Company's initial estimates of reserves may be subject to revision following an acquisition, which may materially and adversely affect the desired benefits of the acquisition.

The Company's ability to complete dispositions of assets, or interests in assets, may be subject to factors beyond its control, and in certain cases the Company may be required to retain liabilities for certain matters.

From time to time, the Company sells an interest in a strategic asset for the purpose of assisting or accelerating the asset's development. In addition, the Company regularly reviews its property base for the purpose of identifying nonstrategic assets, the disposition of which would increase capital resources available for other activities and create organizational and operational efficiencies. Various factors could materially affect the ability of the Company to dispose of such interests or nonstrategic assets or complete announced dispositions, including the receipt of approvals of governmental agencies or third parties and the availability of purchasers willing to acquire the interests or purchase the nonstrategic assets on terms and at prices acceptable to the Company.

Sellers typically retain certain liabilities or indemnify buyers for certain matters. The magnitude of any such retained liability or indemnification obligation may be difficult to quantify at the time of the transaction and ultimately may be material. Also, as is typical in divestiture transactions, third parties may be unwilling to release the Company from guarantees or other credit support provided prior to the sale of the divested assets. As a result, after a divestiture, the Company may remain secondarily liable for the obligations guaranteed or supported to the extent that the buyer of the assets fails to perform these obligations.

The Company's gas processing operations are subject to operational risks, which could result in significant damages and the loss of revenue.

As of December 31, 2013, the Company owned interests in six gas processing plants and nine treating facilities. The Company is the operator of two of the gas processing plants and all nine of the treating facilities. There are significant risks associated with the operation of gas processing plants. Gas and NGLs are volatile and explosive and may include carcinogens. Damage to or improper operation of a gas processing plant or facility could result in an explosion or the discharge of toxic gases, which could result in significant damage claims in addition to interrupting a revenue source.

The Company's operations involve many operational risks, some of which could result in unforeseen interruptions to the Company's operations and substantial losses to the Company for which the Company may not be adequately insured.

The Company's operations, including well stimulation and completion activities, such as hydraulic fracturing, are subject to all the risks normally incident to the oil and gas development and production business, including:

• blowouts, cratering, explosions and fires;

• adverse weather effects;

• environmental hazards, such as gas leaks, oil spills, pipeline and vessel ruptures, encountering NORM, and unauthorized discharges of toxic gases, brine, well stimulation and completion fluids or other pollutants into the surface and subsurface environment;

• high costs, shortages or delivery delays of equipment, labor or other services or water for hydraulic fracturing;

• facility or equipment malfunctions, failures or accidents;

• title problems;

• pipe or cement failures or casing collapses;

• compliance with environmental and other governmental requirements;

• lost or damaged oilfield workover and service tools;

• unusual or unexpected geological formations or pressure or irregularities in formations; and

• natural disasters.

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PIONEER NATURAL RESOURCES COMPANY

The Company's overall exposure to operational risks may increase as its drilling activity expands and as it seeks to directly provide drilling, fracture stimulation and other services internally. Any of these risks could result in substantial losses to the Company due to injury or loss of life, damage to or destruction of wells, production facilities or other property, clean-up responsibilities, regulatory investigations and penalties and suspension of operations.

The Company is not fully insured against certain of the risks described above, either because such insurance is not available or because of the high premium costs and deductibles associated with obtaining such insurance. Additionally, the Company relies to a large extent on facilities owned and operated by third-parties, and damage to or destruction of those third-party facilities could affect the ability of the Company to produce, transport and sell its hydrocarbons.

Part of the Company's strategy involves using some of the latest available horizontal drilling and completion techniques, which involve risks and uncertainties in their application.

The Company's operations involve utilizing some of the latest drilling and completion techniques as developed by it and its service providers. Risks that the Company faces while drilling horizontal wells include, but are not limited to, the following:

• landing the wellbore in the desired drilling zone;

• staying in the desired drilling zone while drilling horizontally through the formation;

• running casing the entire length of the wellbore; and

• being able to run tools and other equipment consistently through the horizontal wellbore.

Risks that the Company faces while completing wells include, but are not limited to, the following:

• the ability to fracture stimulate the planned number of stages;

• the ability to run tools the entire length of the wellbore during completion operations; and

• the ability to successfully clean out the wellbore after completion of the final fracture stimulation stage.

The results of drilling in emerging areas are more uncertain initially than drilling results in areas that are more developed and have a longer history of established production. New discoveries and emerging formations have limited or no production history and, consequently, the Company is more limited in assessing future drilling results in these areas. If the Company's drilling results are worse than anticipated, the return on investment for a particular project may not be as attractive as anticipated and the Company may recognize noncash impairment charges to reduce the carrying value of its unproved properties.

The Company's expectations for future drilling activities will be realized over several years, making them susceptible to uncertainties that could materially alter the occurrence or timing of such activities.

The Company has identified drilling locations and prospects for future drilling opportunities, including development, exploratory and infill drilling activities. These drilling locations and prospects represent a significant part of the Company's future drilling plans. For example, the Company's proved reserves as of December 31, 2013 include proved undeveloped reserves and proved developed reserves that are behind pipe of 102.5 MMBBLs of oil, 41.9 MMBBLs of NGLs and 328.9 BCF of gas. The Company's ability to drill and develop these locations depends on a number of factors, including the availability of capital, seasonal conditions, regulatory approvals, negotiation of agreements with third parties, commodity prices, costs, access to and availability of equipment, services, resources and personnel and drilling results. Changes in the laws or regulations on which the Company relies in planning and executing its drilling programs could adversely impact the Company's ability to successfully complete those programs. For example, under current Texas laws and regulations the Company may receive permits to drill, and may drill and complete, certain horizontal wells that traverse one or more units and/or leases; a change in those laws or regulations could adversely impact the Company's ability to drill those wells. Because of these uncertainties, the Company cannot give any assurance as to the timing of these activities or that they will ultimately result in the realization of proved reserves or meet the Company's expectations for success. As such, the Company's actual drilling activities may materially differ from the Company's current expectations, which could have a significant adverse effect on the Company's proved reserves, financial condition and results of operations.

The Company may not be able to obtain access on commercially reasonable terms or otherwise to pipelines and storage facilities, gas gathering systems and other transportation, processing, fractionation and refining facilities to market its oil, NGL and gas production; the Company relies on a limited number of purchasers for a majority of its products.

The marketing of oil, NGL and gas production depends in large part on the availability, proximity and capacity of pipelines and storage facilities, gas gathering systems and other transportation, processing, fractionation and refining facilities, as well as the existence of adequate markets. If there were insufficient capacity available on these systems, if these systems were unavailable to the Company, or if access to these systems were to become commercially unreasonable, the price offered for the Company's production could be significantly depressed, or the Company could be forced to shut in some production or delay or discontinue

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PIONEER NATURAL RESOURCES COMPANY

drilling plans and commercial production following a discovery of hydrocarbons while it constructs its own facility or awaits the availability of third party facilities. The Company also relies (and expects to rely in the future) on facilities developed and owned by third parties in order to store, process, transport, fractionate and sell its oil, NGL and gas production. The Company's plans to develop and sell its oil and gas reserves could be materially and adversely affected by the inability or unwillingness of third parties to provide sufficient transportation, storage or processing and fractionation facilities to the Company, especially in areas of planned expansion where such facilities do not currently exist.

For example, following Hurricanes Gustav and Ike in 2008, certain Permian Basin gas processors were forced to shut down their plants due to the shutdown of the Texas Gulf Coast NGL fractionators. The Company was able to produce its oil wells and vent or flare the associated gas; however, there is no certainty the Company will be able to vent or flare gas in the future due to potential changes in regulations.The amount of oil and gas that can be produced is subject to limitation in certain circumstances, such as pipeline interruptions due to scheduled and unscheduled maintenance, excessive pressure, physical damage to the gathering, transportation, refining or processing facilities, or lack of capacity on such facilities. The Company has periodically experienced high line pressure at its tank batteries, which has occasionally led to the flaring of gas due to the inability of the gas gathering systems in the areas to support the increased gas production. The curtailments arising from these and similar circumstances may last from a few days to several months, and in many cases, the Company may be provided only limited, if any, notice as to when these circumstances will arise and their duration.

To the extent that the Company enters into transportation contracts with gas pipelines that are subject to FERC regulation, the Company is subject to FERC requirements related to use of such capacity. Any failure on the Company's part to comply with FERC's regulations and policies or with an interstate pipeline's tariff could result in the imposition of civil and criminal penalties.

A limited number of companies purchase a majority of the Company's oil, NGLs and gas. The loss of a significant purchaser could have a material adverse effect on the Company's ability to sell its production.

The Company is growing production in areas of high industry activity, which may affect its ability to obtain the personnel, equipment, services, resources and facilities access needed to complete its development activities as planned or result in increased costs.

The Company's operations and drilling activity are concentrated in areas in which industry activity has increased rapidly, particularly in the Spraberry field in West Texas and the Eagle Ford Shale play in South Texas. As a result, demand for personnel, equipment, power, services and resources, as well as access to transportation, processing and refining facilities in these areas, has increased, as have the costs for those items. In addition, hydraulic fracturing and other operations require significant quantities of water, which supply may be affected by drought conditions. Any delay or inability to secure the personnel, equipment, power, services, resources and facilities access necessary for the Company to complete its planned development activities, including the result of any changes in laws or regulations applicable to the Company's operations relating to water usage, could result in oil and gas production volumes being below the Company's forecasted volumes. In addition, any such negative effect on production volumes, or significant increases in costs, could have a material adverse effect on the Company's cash flow and profitability.

The refining industry may be unable to absorb rising U.S. oil and condensate production; in such a case, the resulting surplus could depress prices and restrict the availability of markets.

Under U.S. law and regulations, the export of oil and certain condensates is restricted. Absent a change in this law or an expansion of U.S. refining capacity, rising U.S. production of oil and condensate could result in a surplus of these products, which would likely cause prices for these commodities to fall and markets to constrict. In such circumstances, the returns on the Company’s capital projects would decline, possibly to levels that would make execution of the Company’s drilling plans uneconomical, and a lack of market for the Company's products could require that the Company shut in some portion of its production. If this were to occur, the Company’s production and cash flow could decrease, or could increase less than forecasted, which could have a material adverse effect on the Company's cash flow and profitability.

The nature of the Company's assets and production operations exposes it to significant costs and liabilities with respect to environmental and occupational health and safety matters.

The oil and gas business involves the production, handling, sale and disposal of environmentally sensitive materials and is subject to environmental hazards, such as oil spills, produced water spills, gas leaks, pipeline and vessel ruptures and unauthorized discharges of substances or gases, that could expose the Company to substantial liability due to pollution and other environmental damage. Pollution and similar environmental risks generally are not fully insurable either because such insurance is not available or because of the high premium costs and deductible associated with obtaining such insurance. A variety of federal, state and local laws and regulations govern the environmental aspects of the oil and gas business. Noncompliance with these laws and regulations may subject the Company to administrative, civil or criminal penalties, remedial cleanups, and natural resource damages or other liabilities, and compliance with these laws and regulations may increase the cost of the Company's operations. Such laws and

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PIONEER NATURAL RESOURCES COMPANY

regulations may also affect the costs of acquisitions. See "Item 1. Business — Competition, Markets and Regulations — Environmental and occupational health and safety matters" above for additional discussion related to environmental risks.

Environmental laws and regulations are subject to amendment or replacement by more stringent laws and regulations and no assurance can be given that continued compliance with existing or future environmental laws and regulations will not result in a curtailment of production or processing activities, result in a material increase in the costs of production, development, exploration or processing operations or adversely affect the Company's future operations and financial condition.

The Company could incur significant costs and liabilities in responding to contamination that occurs at its properties or as a result of its operations.

There is inherent risk of incurring significant environmental costs and liabilities in operations upon the Company's properties due to its handling of petroleum hydrocarbons and wastes, because of air emissions and water discharges related to its operations, and as a result of historical operations and waste disposal practices by prior owners and operators. The Company currently owns, leases or operates properties that for many years have been used for oil and gas exploration and production activities, and petroleum hydrocarbons, hazardous substances and wastes have been released on or under such properties and could be released during future operations. Joint and several strict liabilities may be incurred in connection with such releases of petroleum hydrocarbons and wastes on, under or from the Company's properties. Private parties, including lessors of properties on which the Company operates and the owners or operators of properties adjacent to the Company's operations and facilities where the Company's petroleum hydrocarbons or wastes are taken for reclamation or disposal, may also have the right to pursue legal actions to enforce compliance as well as seek damages for noncompliance with environmental laws and regulations or for personal injury or property damage. The Company may not be able to recover some or any of these costs from insurance or other sources of contractual indemnity.

The Company's credit facility and debt instruments have substantial restrictions and financial covenants that may restrict its business and financing activities.

The Company is a borrower under fixed rate senior notes and a credit facility. The terms of the Company's borrowings specify scheduled debt repayments and require the Company to comply with certain associated covenants and restrictions. The Company's ability to comply with the debt repayment terms, associated covenants and restrictions is dependent on, among other things, factors outside the Company's direct control, such as commodity prices and interest rates. See Note G of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for information regarding the Company's outstanding debt as of December 31, 2013 and the terms associated therewith.

The Company's ability to obtain additional financing is also affected by the Company's debt credit ratings and competition for available debt financing.

The Company faces significant competition, and some of its competitors have resources in excess of the Company's available resources.

The oil and gas industry is highly competitive. The Company competes with a large number of companies, producers and operators in a number of areas such as:

• seeking to acquire oil and gas properties suitable for development or exploration;

• marketing oil, NGL and gas production; and

• seeking to acquire the equipment and expertise, including trained personnel, necessary to evaluate, operate and develop properties.

Some of the Company's competitors are larger and have substantially greater financial and other resources than the Company. See "Item 1. Business — Competition, Markets and Regulations" for additional discussion regarding competition.

The Company is subject to regulations that may cause it to incur substantial costs.

The Company's business is regulated by a variety of federal, state and local laws and regulations. For instance, in connection with the Company's CBM operations in the Raton Basin in Colorado, the Colorado Supreme Court affirmed a state water court holding that water produced in connection with CBM operations should be subject to state water-use regulations, including regulations requiring permits for diversion and use of surface and subsurface water, an evaluation of potential competing permits, possible uses of the water and a possible requirement to provide augmentation water supplies for water rights owners with more senior rights. As another example, the underground injection well program under the SDWA requires permits from the EPA or an analogous state agency for the Company's disposal wells, establishes minimum standards for injection well operations, and restricts the types and quantities of fluids that may be injected. In some areas of Texas, there has been concern that certain formations into which disposal wells are injecting produced waters could become over-pressured after many years of injection, and the governing Texas regulatory agency is reviewing the data to determine whether any action is necessary to address this issue. If the Texas state

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PIONEER NATURAL RESOURCES COMPANY

agency were to decline to issue permits for new injection wells into the formations currently utilized by the Company, the Company may be required to seek alternative methods of disposing of produced waters, including injecting into deeper formations, which could increase its costs. There can be no assurance that present or future regulations will not adversely affect the Company's business and operations, including that the Company may be required to suspend drilling operations or shut in production pending compliance. See "Item 1. Business — Competition, Markets and Regulations" for additional discussion regarding government regulation.

The Company's sales of oil, gas, NGLs or other energy commodities, and any derivative activities related to such energy commodities, expose the Company to potential regulatory risks.

FERC, the FTC and the CFTC hold statutory authority to monitor certain segments of the physical and futures energy commodities markets relevant to the Company's business. These agencies have imposed broad regulations prohibiting fraud and manipulation of such markets. With regard to the Company's physical sales of oil, gas, NGLs or other energy commodities, and any derivative activities related to these energy commodities, the Company is required to observe the market-related regulations enforced by these agencies, which hold substantial enforcement authority. Failure to comply with such regulations, as interpreted and enforced, could materially and adversely affect the Company's business results of operations and financial condition.

Estimates of proved reserves and future net cash flows are not precise. The actual quantities and net cash flows of the Company's proved reserves may prove to be lower than estimated.

Numerous uncertainties exist in estimating quantities of proved reserves and future net cash flows therefrom. The estimates of proved reserves and related future net cash flows set forth in this Report are based on various assumptions, which may ultimately prove to be inaccurate.

Petroleum engineering is a subjective process of estimating underground accumulations of oil and gas that cannot be measured in an exact manner. Estimates of economically recoverable oil and gas reserves and estimates of future net cash flows depend upon a number of variable factors and assumptions, including the following:

• historical production from the area compared with production from other producing areas;

• the quality and quantity of available data;

• the interpretation of that data;

• the assumed effects of regulations by governmental agencies;

• assumptions concerning future commodity prices; and

• assumptions concerning future operating costs, severance, ad valorem and excise taxes, development costs, transportation costs and workover and remedial costs.

Because all proved reserve estimates are to some degree subjective, each of the following items may differ materially from those assumed in estimating proved reserves:

• the quantities of oil and gas that are ultimately recovered;

• the production costs incurred to recover the reserves;

• the amount and timing of future development expenditures; and

• future commodity prices.

Furthermore, different reserve engineers may make different estimates of proved reserves and cash flows based on the same available data. The Company's actual production, revenues and expenditures with respect to proved reserves will likely be different from estimates, and the differences may be material.

As required by the SEC, the estimated discounted future net cash flows from proved reserves are based on average prices preceding the date of the estimate and costs as of the date of the estimate, while actual future prices and costs may be materially higher or lower. Actual future net cash flows also will be affected by factors such as:

• the amount and timing of actual production;

• levels of future capital spending;

• increases or decreases in the supply of or demand for oil, NGLs and gas; and

• changes in governmental regulations or taxation.

Standardized Measure is a reporting convention that provides a common basis for comparing oil and gas companies subject to the rules and regulations of the SEC. In general, it requires the use of commodity prices that are based upon a 12-month unweighted average, as well as operating and development costs being incurred at the end of the reporting period. Consequently, it may not reflect the prices ordinarily received or that will be received for oil and gas production because of seasonal price fluctuations or other varying market conditions, nor may it reflect the actual costs that will be required to produce or develop the

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PIONEER NATURAL RESOURCES COMPANY

oil and gas properties. Accordingly, estimates included herein of future net cash flows may be materially different from the future net cash flows that are ultimately received. In addition, the ten percent discount factor, which is required by the SEC to be used in calculating discounted future net cash flows for reporting purposes, may not be the most appropriate discount factor based on interest rates in effect from time to time and risks associated with the Company or the oil and gas industry in general. Therefore, the estimates of discounted future net cash flows or Standardized Measure in this Report should not be construed as accurate estimates of the current market value of the Company's proved reserves.

The Company's actual production could differ materially from its forecasts.

From time to time, the Company provides forecasts of expected quantities of future oil and gas production. These forecasts are based on a number of estimates, including expectations of production from existing wells and the outcome of future drilling activity. Should these estimates prove inaccurate, actual production could be adversely affected. In addition, the Company's forecasts assume that none of the risks associated with the Company's oil and gas operations summarized in this "Item 1A. Risk Factors" occur, such as facility or equipment malfunctions, adverse weather effects, or downturns in commodity prices or significant increases in costs, which could make certain drilling activities or production uneconomical.

The Company's business could be negatively affected by security threats, including cybersecurity threats, and other disruptions.

As an oil and gas producer, the Company faces various security threats, including cybersecurity threats to gain unauthorized access to sensitive information or to render data or systems unusable; threats to the security of the Company's facilities and infrastructure or third party facilities and infrastructure, such as processing plants and pipelines; and threats from terrorist acts. The potential for such security threats has subjected the Company's operations to increased risks that could have a material adverse effect on the Company's business. In particular, the Company's implementation of various procedures and controls to monitor and mitigate security threats and to increase security for the Company's information, facilities and infrastructure may result in increased capital and operating costs. Moreover, there can be no assurance that such procedures and controls will be sufficient to prevent security breaches from occurring. If any of these security breaches were to occur, they could lead to losses of sensitive information, critical infrastructure or capabilities essential to the Company's operations and could have a material adverse effect on the Company's reputation, financial position, results of operations or cash flows. Cybersecurity attacks in particular are becoming more sophisticated and include, but are not limited to, malicious software, attempts to gain unauthorized access to data and systems, and other electronic security breaches that could lead to disruptions in critical systems, unauthorized release of confidential or otherwise protected information, and corruption of data. These events could damage the Company's reputation and lead to financial losses from remedial actions, loss of business or potential liability.

A failure by purchasers of the Company's production to perform their obligations to the Company could require the Company to recognize a pre-tax charge in earnings and have a material adverse effect on the Company's results of operation.

The Company relies on a limited number of purchasers to purchase a majority of its products. To the extent that purchasers of the Company's production rely on access to the credit or equity markets to fund their operations, there is a risk that those purchasers could default in their contractual obligations to the Company if such purchasers were unable to access the credit or equity markets for an extended period of time. If for any reason the Company were to determine that it was probable that some or all of the accounts receivable from any one or more of the purchasers of the Company's production were uncollectible, the Company would recognize a pre-tax charge in the earnings of that period for the probable loss.

Declining general economic, business or industry conditions could have a material adverse effect on the Company's results of operations.

The worldwide economic outlook has been improving steadily since 2010, but if there are renewed concerns about global economic growth or government debt in Europe or the United States, there could be a significant adverse effect on global financial markets and commodity prices. If the economic climate in the United States or abroad were to deteriorate, demand for petroleum products could diminish, which could depress the prices at which the Company could sell its oil, NGLs and gas and ultimately decrease the Company's net revenue and profitability.

Certain U.S. federal income tax deductions currently available with respect to oil and gas exploration and development may be eliminated as a result of future legislation.

In recent years, legislation has been proposed that would, if enacted into law, make significant changes to U.S. tax laws, including the elimination of certain key U.S. federal income tax incentives currently available to oil and gas companies. Such tax legislation changes include, but are not limited to, (i) the repeal of the percentage depletion allowance for oil and gas properties, (ii) the elimination of current deductions for intangible drilling and development costs, (iii) the elimination of the deduction for certain domestic production activities and (iv) an extension of the amortization period for certain geological and geophysical

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PIONEER NATURAL RESOURCES COMPANY

expenditures. It is unclear whether these or similar changes will be enacted and, if enacted, how soon any such changes could become effective. The passage of any legislation as a result of these proposals or any other similar changes in U.S. federal income tax laws could eliminate or postpone certain tax deductions that are currently available with respect to oil and gas exploration and development, and any such change could have an adverse effect on the Company's financial position, results of operations and cash flows.

Climate change legislation and regulatory initiatives restricting emissions of GHGs could result in increased operating costs and reduced demand for the oil, NGLs and gas the Company produces.

In 2009, the EPA officially published its findings that emissions of GHGs present an endangerment to public health and the environment because emissions of such gases are, according to the EPA, contributing to warming of the Earth's atmosphere and other climatic changes. Based on these findings, the EPA adopted regulations under the CAA establishing Title V and PSD permitting requirements for large sources of GHGs. The Company could become subject to these permitting requirements and be required to install "best available control technology" to limit emissions of GHGs from any new or significantly modified facilities that the Company may seek to construct in the future if they would otherwise emit large volumes of GHGs. The EPA has also adopted rules requiring the reporting of GHG emissions on an annual basis from specified GHG emission sources in the United States, including certain oil and gas production facilities, which include certain of the Company's facilities. While the U.S. Congress has from time to time considered legislation to reduce emissions of GHGs, there has not been significant activity in the form of adopted legislation to reduce GHG emissions at the federal level in recent years. In the absence of federal climate legislation in the United States, a number of state and regional efforts have emerged that are aimed at tracking or reducing GHG emissions by means of cap and trade programs that typically require major sources of GHG emissions, such as electric power plants, to acquire and surrender emission allowances in return for emitting those GHGs. If the U.S. Congress undertakes comprehensive tax reform in the coming year, it is possible that such reform may include a carbon tax, which could impose additional direct costs on the Company's operations. Although it is not possible at this time to predict how legislation or new regulations that may be adopted to address GHG emissions would affect the Company's business, any such future laws and regulations could require the Company to incur increased operating costs, such as costs to purchase and operate emissions control systems, acquire emissions allowances or comply with new regulatory or reporting requirements, including the imposition of a carbon tax. Any such legislation or regulatory programs could also increase the cost to the consumer, and thereby reduce demand for oil and gas, which could reduce the demand for the oil and gas the Company produces. Consequently, legislation and regulatory programs to reduce emissions of GHGs could have an adverse effect on the Company's business, financial condition and results of operations. See "Item 1. Business - Competition, Markets and Regulations - Environmental and occupational health and safety matters - Climate change" for additional discussion relating to climate change.

The enactment of derivatives legislation could have an adverse effect on the Company's ability to use derivative instruments to reduce the effect of commodity price, interest rate and other risks associated with its business.

The Dodd-Frank Wall Street Reform and Consumer Protection Act (the "Dodd-Frank Act") enacted on July 21, 2010, established federal oversight and regulation of the over-the-counter derivatives market and entities, such as the Company, that participate in that market. The Dodd-Frank Act requires the CFTC and the SEC to promulgate rules and regulations for its implementation. In October 2011, the CFTC issued regulations to set position limits for certain futures and option contracts in the major energy markets and for swaps that are their economic equivalents. The initial position limits rule was vacated by the United States District Court for the District of Colombia in September 2012. However, in November 2013, the CFTC proposed new rules that would place limits on positions in certain core futures and equivalent swaps contracts for or linked to certain physical commodities, subject to exceptions for certain bona fide derivative transactions. As these new position limit rules are not yet final, the impact of those provisions on the Company is uncertain at this time. The CFTC has designated certain interest rate swaps and credit default swaps for mandatory clearing and the associated rules also will require the Company, in connection with covered derivative activities, to comply with clearing and trade-execution requirements or take steps to qualify for an exemption to such requirements. Although the Company believes it qualifies for the end-user exception from the mandatory clearing requirements for swaps entered to mitigate its commercial risks, the application of the mandatory clearing and trade execution requirements to other market participants, such as swap dealers, may change the cost and availability of the Company's derivatives. Although the CFTC has finalized certain regulations, others remain to be finalized or implemented and it is not possible at this time to predict when this will be accomplished or what the effect of any such regulations will be on the Company. For example, for uncleared swaps, the CFTC or federal banking regulators may require end-users to enter into credit support documentation and/or post initial and variation margin. Posting of collateral could impact liquidity and reduce cash available to the Company for capital expenditures, therefore reducing its ability to execute derivatives to reduce risk and protect cash flows. The proposed margin rules are not yet final, and therefore the impact of those provisions to the Company is uncertain at this time. The Dodd-Frank Act also may require the counterparties to the Company's derivative instruments to spin off some of their derivatives activities to a separate entity, which may not be as creditworthy as the current counterparty. The full impact of the Dodd-Frank Act and related regulatory requirements upon the Company's business will not be known until the regulations are implemented and the market for derivatives contracts has adjusted. The Dodd-Frank Act and any new regulations could significantly increase the cost of derivative contracts, materially

26

PIONEER NATURAL RESOURCES COMPANY

alter the terms of derivative contracts, reduce the availability of derivatives to protect against risks the Company encounters, reduce the Company's ability to monetize or restructure its existing derivative contracts, and increase the Company's exposure to less creditworthy counterparties. If the Company reduces its use of derivatives as a result of the Dodd-Frank Act and regulations, the Company's results of operations may become more volatile and its cash flows may be less predictable, which could adversely affect the Company's ability to plan for and fund capital expenditures. Finally, the Dodd-Frank Act was intended, in part, to reduce the volatility of oil and gas prices, which some legislators attributed to speculative trading in derivatives and commodity instruments related to oil and gas. The Company's revenues could therefore be adversely affected if a consequence of the Dodd-Frank Act and implementing regulations is to lower commodity prices. Any of these consequences could have a material adverse effect on the Company, its financial condition and its results of operations.

Federal, state and local legislative and regulatory initiatives relating to hydraulic fracturing, as well as governmental reviews of such activities, could result in increased costs and additional operating restrictions or delays and adversely affect the Company's production.

Hydraulic fracturing is a common practice that is used to stimulate production of hydrocarbons from tight formations. The Company routinely utilizes hydraulic fracturing techniques in the majority of its drilling and completion programs. The process involves the injection of water, sand and additives under pressure into targeted subsurface formations to stimulate oil and gas production. The process is typically regulated by state oil and gas commissions, but the EPA has asserted federal regulatory authority over hydraulic fracturing involving diesel fuels under the SDWA's Underground Injection Control Program and published final permitting guidance in February 2014 addressing the performance of such activities. In 2011, the EPA announced its intent to develop and issue regulations under the Toxic Substances Control Act to require companies to disclose information regarding the chemicals used in hydraulic fracturing, and in its Semi-annual Regulatory agenda published in July 2013, the agency continues to project the future issuance of an Advance Notice of Proposed Rulemaking that would seek public input on the design and scope of such disclosure regulations. The EPA has published final rules under the CAA that, among other things, require producers to reduce volatile organic compound emissions from certain subcategories of fractured and refractured gas wells for which well completion operations are being conducted by routing flowback emissions to a gathering line or capturing and combusting flowback emissions using a combustion device, such as a flare, until January 1, 2015 and performing green completions, with or without combustion devices, on or after January 1, 2015. Also, in May 2013, the BLM published a supplemental notice of proposed rulemaking governing hydraulic fracturing on federal and Indian oil and gas leases that would require public disclosure of chemicals used in hydraulic fracturing, confirmation that wells used in fracturing operations meet appropriate construction standards, and development of appropriate plans for managing flowback water that returns to the surface.

In addition, the U.S. Congress, from time to time, has considered adopting legislation intended to provide for federal regulation of hydraulic fracturing and to require disclosure of the chemicals used in the hydraulic-fracturing process. Certain states in which the Company operates, including Colorado and Texas have adopted, and other states are considering adopting, regulations that could impose new or more stringent permitting, disclosure, and well-construction requirements on hydraulic-fracturing operations. In addition, local land use restrictions, such as city ordinances, may restrict or prohibit drilling in general or hydraulic fracturing in particular. In the event federal, state or local restrictions are adopted in areas where the Company is currently conducting, or in the future plan to conduct operations, the Company may incur additional costs to comply with such requirements that may be significant in nature, experience delays or curtailment in the pursuit of exploration, development, or production activities, and perhaps be limited or precluded in the drilling of wells or in the amounts that the Company is ultimately able to produce from its reserves.

Certain governmental reviews were recently conducted or are underway that focus on environmental aspects of hydraulic fracturing practices. The White House Council on Environmental Quality is coordinating an administration-wide review of hydraulic fracturing practices. The EPA has commenced a study of the potential environmental effects of hydraulic fracturing on drinking water and groundwater and a draft report is expected to be available for public comment and peer review in 2014. Moreover, the EPA is developing effluent limitations for the treatment and discharge of wastewater resulting from hydraulic fracturing activities and is expected to propose these standards in 2014. These studies, or future studies, depending on their degree of pursuit and any meaningful results obtained, could spur initiatives to further regulate hydraulic fracturing under the SDWA or other regulatory mechanisms. See "Item 1. Business - Competition, Markets and Regulations - Environmental and occupational health and safety matters" for additional discussion related to environmental risks associated with the Company's hydraulic fracturing activities.

Laws and regulations pertaining to threatened and endangered species could delay or restrict the Company's operations and cause it to incur substantial costs.

Various federal and state statutes prohibit certain actions that adversely affect endangered or threatened species and their habitats, migratory birds, wetlands and natural resources. These statutes include the ESA, the Migratory Bird Treaty Act, the CWA and CERCLA. The U.S. Fish and Wildlife Service may designate critical habitat and suitable habitat areas that it believes are

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PIONEER NATURAL RESOURCES COMPANY

necessary for survival of threatened or endangered species. A critical habitat or suitable habitat designation could result in further material restrictions to federal land use and private land use and could delay or prohibit land access or oil and gas development. If harm to species or damages to wetlands, habitat or natural resources occur or may occur, government entities or, at times, private parties may act to prevent oil and gas exploration or development activities or seek damages for harm to species, habitat or natural resources resulting from drilling or construction or releases of oil, wastes, hazardous substances or other regulated materials, and, in some cases, may seek criminal penalties. Moreover, as a result of a settlement approved by the U.S. District Court for the District of Columbia in September 2011, the U.S. Fish and Wildlife Service is required to make a determination on the listing of numerous species as endangered or threatened under the ESA before completion of the agency's 2017 fiscal year. The designation of previously unprotected species as threatened or endangered in areas where the Company conducts operations could cause the Company to incur increased costs arising from species protection measures or could result in limitations on its development and production activities that could have an adverse effect on the Company's ability to develop and produce reserves.

Provisions of the Company's charter documents and Delaware law may inhibit a takeover, which could limit the price investors might be willing to pay in the future for the Company's common stock.

Provisions in the Company's certificate of incorporation and bylaws may have the effect of delaying or preventing an acquisition of the Company or a merger in which the Company is not the surviving company and may otherwise prevent or slow changes in the Company's board of directors and management. In addition, because the Company is incorporated in Delaware, it is governed by the provisions of Section 203 of the Delaware General Corporation Law. These provisions could discourage an acquisition of the Company or other change in control transaction and thereby negatively affect the price that investors might be willing to pay in the future for the Company's common stock.

The Company's sand mining operations are subject to operating risks that are often beyond the Company's control, and such risks may not be covered by insurance.

Ownership of industrial sand mining operations are subject to risks, many of which are beyond the Company's control. These risks include:

• unusual or unexpected geological formations or pressures;

• cave-ins, pit wall failures or rock falls;

• unanticipated ground, grade or water conditions;

• inclement or hazardous weather conditions, including flooding, and the physical impacts of climate change;

• environmental hazards, such as unauthorized spills, releases and discharges of wastes, vessel ruptures and emission of unpermitted levels of pollutants;

• changes in laws and regulations;

• inability to acquire or maintain necessary permits or mining or water rights;

• restrictions on blasting operations;

• inability to obtain necessary production equipment or replacement parts;

• reduction in the amount of water available for processing;

• technical difficulties or failures;

• labor disputes;

• late delivery of supplies;

• fires, explosions or other accidents; and

• facility interruptions or shutdowns in response to environmental regulatory actions.

Any of these risks could result in damage to, or destruction of, the Company's mining properties or production facilities, personal injury, environmental damage, delays in mining or processing, losses or possible legal liability. Not all of these risks are insurable, and the Company's insurance coverage contains limits, deductibles, exclusions and endorsements. The Company's insurance coverage may not be sufficient to meet its needs in the event of loss and any such loss may have a material adverse effect on the Company.

The Company's estimates of sand reserves and resource deposits are imprecise and actual reserves could be less than estimated.

The Company bases its sand reserve and resource estimates on engineering, economic and geological data assembled and analyzed by engineers and geologists, which are periodically reviewed by outside firms. However, commercial sand reserve estimates are necessarily imprecise and depend to some extent on statistical inferences drawn from available drilling data, which may prove unreliable. There are numerous uncertainties inherent in estimating quantities and qualities of commercial sand reserves and costs to mine recoverable reserves, including many factors beyond the Company's control. Estimates of economically recoverable commercial sand reserves necessarily depend on a number of factors and assumptions, all of which may vary considerably from actual results, such as:

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PIONEER NATURAL RESOURCES COMPANY

• geological and mining conditions or effects from prior mining that may not be fully identified by available data or that may differ from experience;

• assumptions concerning future prices of commercial sand products, operating costs, mining technology improvements, development costs and reclamation costs; and

• assumptions concerning future effects of regulation, including the issuance of required permits and taxes by governmental agencies.

The Company's sand mining operations are subject to extensive environmental and occupational health and safety regulations that impose significant costs and potential liabilities.

The Company's sand mining operations are subject to a variety of federal, state and local environmental requirements affecting the mining and mineral processing industry, including, among others, those relating to employee health and safety, environmental permitting and licensing, air emissions and water discharges, GHG emissions, water pollution, waste management and disposal, remediation of soil and groundwater contamination, land use restrictions, reclamation and restoration of properties, hazardous materials and natural resources. Some environmental laws impose substantial penalties for noncompliance, and others, such as the CERCLA, impose strict, retroactive and joint and several liability for the remediation of releases of hazardous substances. Failure to properly handle, transport, store or dispose of hazardous materials or otherwise conduct the Company's sand mining operations in compliance with environmental laws could expose the Company to liability for governmental penalties, cleanup costs and civil or criminal liability associated with releases of such materials into the environment, damages to property or natural resources and other damages, as well as potentially impair the Company's ability to conduct its sand mining operations. In addition, environmental laws and regulations are subject to amendment, replacement or interpretation by more stringent and comprehensive legal requirements. The Company's continued compliance with existing or future laws and regulations could restrict the Company's ability to expand its facilities or extract mineral deposits or could require the Company to acquire costly equipment or to incur other significant expenses in connection with its sand mining operations, which restrictions or costs could have a material adverse effect on the Company's sand mining operations.

Any failure by the Company to comply with applicable environmental laws and regulations in connection with its sand mining operations may cause governmental authorities to take actions that could adversely affect the Company, including:

• issuance of administrative, civil and criminal penalties;

• denial, modification or revocation of permits or other authorizations;

• imposition of injunctive obligations or other limitations on the Company's operations, including interruptions or cessation of operations; and

• requirements to perform site investigatory, remedial or other corrective actions.

In addition to environmental regulation, the Company's sand mining operations are subject to laws and regulations relating to worker health and safety, including such matters as human exposure to crystalline silica dust. Several federal and state regulatory authorities, including the U.S. Mining Safety and Health Administration, may continue to propose changes in their regulations regarding workplace exposure to crystalline silica, such as permissible exposure limits and required controls and personal protective equipment.

The Company's sand mining operations are subject to the Federal Mine Safety and Health Act of 1977, which imposes stringent health and safety standards on numerous aspects of the Company's sand mining operations.

The Company's sand mining operations are subject to the Federal Mine Safety and Health Act of 1977, as amended by the Mine Improvement and New Emergency Response Act of 2006, which imposes stringent health and safety standards on numerous aspects of mineral extraction and processing operations, including the training of personnel, operating procedures, operating equipment and other matters. The Company's failure to comply with such standards, or changes in such standards or the interpretation or enforcement thereof, could have a material adverse effect on the Company's sand mining operations or otherwise impose significant restrictions on the Company's ability to conduct mineral extraction and processing operations.

The Company's sand mining operations are subject to extensive other regulations that impose significant costs and liabilities.

In addition to the environmental and occupational health and safety regulation discussed above, the Company's sand mining operations are also subject to extensive governmental regulation on matters such as permitting and licensing requirements, reclamation and restoration of mining properties after mining is completed, and the effects that mining have on groundwater quality and availability. Also, the Company's sand mining operations require numerous governmental, environmental, mining and other permits, water rights and approvals authorizing operations at each sand mining facility.

In order to obtain permits and renewals of permits in the future for its sand mining operations, the Company may be required to prepare and present data to governmental authorities pertaining to the effect that any such activities may have on the environment.

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PIONEER NATURAL RESOURCES COMPANY

Obtaining or renewing required permits may be delayed or prevented due to opposition by neighboring property owners, members of the public or other third parties and other factors beyond the Company's control. A decision by a governmental agency or other third party to deny or delay issuing a new or renewed permit or approval, or to revoke or substantially modify an existing permit or approval, could have a material adverse effect on the Company's sand mining operations at the affected facility. Current or future regulations could have a material adverse effect on the Company's sand mining operations and the Company may not be able to renew or obtain permits in the future.

The Company's sand mining operations entail silica-related health issues and litigation that could have a material adverse effect on the Company.

The inhalation of respirable crystalline silica dust is associated with the lung disease silicosis. There is evidence of an association between crystalline silica exposure or silicosis and lung cancer and a possible association with other diseases, including immune system disorders, such as scleroderma. These health risks have been, and may continue to be, a significant issue confronting the commercial sand industry. The actual or perceived health risks of mining, processing and handling sand could materially and adversely affect the Company through the threat of product liability or employee lawsuits and increased scrutiny by federal, state and local regulatory authorities.

Premier Silica is named as a defendant, usually among many defendants, in numerous products liability lawsuits brought by or on behalf of current or former employees of Premier Silica's customers alleging damages caused by silica exposure. As of December 31, 2013, Premier Silica was the subject of approximately 2,200 silica exposure claims, the great majority of which have been inactive for many years due to the plaintiffs' failure to meet specific legal requirements to advance their claims. Almost all of the claims pending against Premier Silica arise out of the alleged use of Premier Silica's sand products in foundries or as an abrasive blast media and have been filed in the states of Texas, Florida and Missouri, although some cases have been brought in many other jurisdictions over the years.

It is possible that Premier Silica will continue to have silica-related products liability claims filed against it, including claims that allege silica exposure for periods for which there is not insurance coverage. Any pending or future claims or inadequacies of insurance coverage or indemnification from the seller could have a material adverse effect on the Company's results of operations.

ITEM 1B. UNRESOLVED STAFF COMMENTS

None.

ITEM 2. PROPERTIES

Reserve Estimation Procedures and Audits

The information included in this Report about the Company's proved reserves as of December 31, 2013, 2012 and 2011 is based on evaluations prepared by the Company's engineers and (i) audited by Netherland, Sewell & Associates, Inc. ("NSAI"), with respect to the Company's major properties included in its continuing operations for all periods, and (ii) with respect to the Company's Oooguruk field properties in Alaska, audited by Ryder Scott Company, L.P. ("RSC"), as of December 31, 2012. The Company has no oil and gas reserves from non-traditional sources. Additionally, the Company does not provide optional disclosure of probable or possible reserves.

Reserve estimation procedures. The Company has established internal controls over reserve estimation processes and procedures to support the accurate and timely preparation and disclosure of reserve estimates in accordance with SEC and GAAP requirements. These controls include oversight of the reserves estimation reporting processes by Pioneer's Corporate Reserves Group ("Corporate Reserves"), and annual external audits of substantial portions of the Company's proved reserves by NSAI.

Individual asset teams are responsible for the day-to-day management of the oil and gas activities in each of the Company's Permian Basin, Rockies, Mid-Continent, South Texas, Barnett Shale and Alaska asset areas (the "Asset Teams"). The Company's Asset Teams are each staffed with reservoir engineers and geoscientists who prepare reserve estimates at the end of each calendar quarter for the assets that they manage, using reservoir engineering information technology. There is shared oversight of the Asset Teams' reservoir engineers by the Asset Teams' managers and the Vice President of Corporate Reserves, each of whom is in turn subject to direct or indirect oversight by the Company's management committee ("MC"). The Company's MC is comprised of its Chief Executive Officer, Chief Operating Officer, Chief Financial Officer and other Executive Vice Presidents. The Asset Teams' reserve estimates are reviewed by the Asset Team reservoir engineers before being submitted to Corporate Reserves for further review.

The reserve estimates are summarized in reserve reconciliations that quantify reserve changes since the previous year end as revisions of previous estimates, purchases of minerals-in-place, improved recovery, extensions and discoveries, production and sales of minerals-in-place. All reserve estimates, material assumptions and inputs used in reserve estimates and significant changes in reserve estimates are reviewed for engineering and financial appropriateness and compliance with SEC and GAAP standards

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PIONEER NATURAL RESOURCES COMPANY

by Corporate Reserves, in consultation with the Company's accounting and financial management personnel. Annually, the MC reviews the reserve estimates and any differences with the reserve auditors (for the portion of the reserves audited by NSAI or RSC) on a consolidated basis before these estimates are approved. The engineers and geoscientists who participate in the reserve estimation and disclosure process periodically attend training provided by external consultants and/or through internal Pioneer programs. Additionally, Corporate Reserves has prepared and maintains written policies and guidelines for the Asset Teams to reference on reserve estimation and preparation to promote objectivity in the preparation of the Company's reserve estimates and SEC and GAAP compliance in the reserve estimation and reporting process.

Proved reserves audits. The proved reserve audits performed by NSAI for 2013, 2012 and 2011, and by RSC for 2012, in the aggregate represented 94 percent, 95 percent and 90 percent of the Company's 2013, 2012 and 2011 proved reserves, respectively; and 92 percent, 99 percent and 91 percent of the Company's 2013, 2012 and 2011 associated pre-tax present value of proved reserves discounted at ten percent, respectively.

NSAI follows the general principles set forth in the "Standards Pertaining to the Estimating and Auditing of Oil and Gas Reserve Information" promulgated by the Society of Petroleum Engineers (the "SPE"). A reserve audit as defined by the SPE is not the same as a financial audit. The SPE's definition of a reserve audit includes the following concepts:

• A reserve audit is an examination of reserve information that is conducted for the purpose of expressing an opinion as to whether such reserve information, in the aggregate, is reasonable and has been presented in conformity with the 2007 SPE publication entitled "Standards Pertaining to the Estimating and Auditing of Oil and Gas Reserves Information."

• The estimation of reserves is an imprecise science due to the many unknown geologic and reservoir factors that cannot be estimated through sampling techniques. Since reserves are only estimates, they cannot be audited for the purpose of verifying exactness. Instead, reserve information is audited for the purpose of reviewing in sufficient detail the policies, procedures and methods used by a company in estimating its reserves so that the reserve auditors may express an opinion as to whether, in the aggregate, the reserve information furnished by a company is reasonable.

• The methods and procedures used by a company, and the reserve information furnished by a company, must be reviewed in sufficient detail to permit the reserve auditor, in its professional judgment, to express an opinion as to the reasonableness of the reserve information. The auditing procedures require the reserve auditor to prepare its own estimates of reserve information for the audited properties.

In conjunction with the audit of the Company's proved reserves and associated pre-tax present value discounted at ten percent, Pioneer provided to NSAI its external and internal engineering and geoscience technical data and analyses. Following NSAI's review of that data, it had the option of honoring Pioneer's interpretations, or making its own interpretations. No data was withheld from NSAI. NSAI accepted without independent verification the accuracy and completeness of the historical information and data furnished by Pioneer with respect to ownership interest, oil and gas production, well test data, commodity prices, operating and development costs, and any agreements relating to current and future operations of the properties and sales of production. However, if in the course of its evaluations something came to its attention that brought into question the validity or sufficiency of any such information or data, NSAI did not rely on such information or data until it had satisfactorily resolved its questions relating thereto or had independently verified such information or data.

In the course of its evaluations, NSAI prepared, for all of the audited properties, its own estimates of the Company's proved reserves and the pre-tax present values of such reserves discounted at ten percent. NSAI reviewed its audit differences with the Company, and, in a number of cases, held meetings with the Company to review additional reserves work performed by the Company's technical teams and any updated performance data related to the proved reserve differences. Such data was incorporated, as appropriate, by both parties into the proved reserve estimates. NSAI's estimates, including any adjustments resulting from additional data, of those proved reserves and the pre-tax present value of such reserves discounted at ten percent did not differ from Pioneer's estimates by more than ten percent in the aggregate. However, when compared on a lease-by-lease, field-by-field or area-by-area basis, some of the Company's estimates were greater than those of the reserve auditors and some were less than the estimates of the reserve auditors. When such differences do not exceed ten percent in the aggregate and NSAI is satisfied that the proved reserves and pre-tax present values of such reserves discounted at ten percent are reasonable and that its audit objectives have been met, NSAI will issue an unqualified audit opinion. Remaining differences are not resolved due to the limited cost benefit of continuing such analyses by the Company and the reserve auditors. At the conclusion of the audit process, it was NSAI's opinion, as set forth in its audit letter, which is included as an exhibit to this Report, that Pioneer's estimates of the Company's proved oil and gas reserves and associated pre-tax present values discounted at ten percent are, in the aggregate, reasonable and have been prepared in accordance with the "Standards Pertaining to the Estimating and Auditing of Oil and Gas Reserves Information" promulgated by the SPE.

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PIONEER NATURAL RESOURCES COMPANY

See "Item 1A. Risk Factors," "Critical Accounting Estimates" in "Item 7. Management's Discussion and Analysis and Results of Operations" and "Item 8. Financial Statements and Supplementary Data" for additional discussions regarding proved reserves and their related cash flows.

Qualifications of reserves preparers and auditors. Corporate Reserves is staffed by petroleum engineers with extensive industry experience and is managed by the Vice President of Corporate Reserves, the technical person that is primarily responsible for overseeing the Company's reserves estimates. These individuals meet the professional qualifications of reserves estimators and reserves auditors as defined by the "Standards Pertaining to the Estimating and Auditing of Oil and Gas Reserves Information," promulgated by the SPE. The qualifications of the Vice President of Corporate Reserves include 36 years of experience as a petroleum engineer, with 29 years focused on reserves reporting for independent oil and gas companies, including Pioneer. His educational background includes an undergraduate degree in Chemical Engineering and a Masters of Business Administration degree in Finance. He is also a Chartered Financial Analyst Charterholder.

NSAI provides worldwide petroleum property analysis services for energy clients, financial organizations and government agencies. NSAI was founded in 1961 and performs consulting petroleum engineering services under Texas Board of Professional Engineers Registration No. F-2699. The technical person primarily responsible for auditing the Company's reserves estimates has been a practicing consulting petroleum engineer at NSAI since 1983 and has over 35 years of practical experience in petroleum engineering, including over 33 years of experience in the estimation and evaluation of proved reserves. He graduated with a Bachelor of Science degree in Chemical Engineering in 1978 and meets or exceeds the education, training and experience requirements set forth in the "Standards Pertaining to the Estimating and Auditing of Oil and Gas Reserves Information" promulgated by the board of directors of the SPE.

RSC provides worldwide petroleum property analysis services for energy clients, financial organizations and government agencies. RSC was founded in 1937 and performs consulting petroleum engineering services under Texas Board of Professional Engineers Registration No. F-1580. The technical person primarily responsible for auditing the Company's Alaska reserves estimates in 2012 was a practicing consulting petroleum engineer at RSC since 2000 with over 29 years of practical experience in petroleum engineering. He graduated with a Bachelor of Science degree in Petroleum Engineering and a Master of Business Administration degree and at the time of the reserves audit he met or exceeded the education, training and experience requirements set forth in the "Standards Pertaining to the Estimating and Auditing of Oil and Gas Reserves Information" promulgated by the board of directors of the SPE.

Technologies used in reserves estimates. Proved undeveloped reserves include those reserves that are expected to be recovered from new wells on undrilled acreage, or from existing wells where a relatively major expenditure is required for completion. Undeveloped reserves may be classified as proved reserves on undrilled acreage directly offsetting development areas that are reasonably certain of production when drilled, or where reliable technology provides reasonable certainty of economic producibility. Undrilled locations may be classified as having undeveloped proved reserves only if an ability and intent has been established to drill the reserves within five years, unless specific circumstances justify a longer time period.

In the context of reserves estimations, reasonable certainty means a high degree of confidence that the quantities will be recovered and reliable technology means a grouping of one or more technologies (including computational methods) that has been field-tested and has been demonstrated to provide reasonable certain results with consistency and repeatability in the formation being evaluated or in an analogous formation. In estimating proved reserves, the Company uses several different traditional methods such as performance-based methods, volumetric-based methods and analogy with similar properties. In addition, the Company utilizes additional technical analysis such as seismic interpretation, wireline formation tests, geophysical logs and core data to provide incremental support for more complex reservoirs. Information from this incremental support is combined with the traditional technologies outlined above to enhance the certainty of the Company's proved reserve estimates.

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PIONEER NATURAL RESOURCES COMPANY

Proved Reserves

As of December 31, 2013 and 2012, the Company's oil and gas proved reserves are located entirely in the United States. The Company's proved reserves as of December 31, 2011 were almost exclusively located in the United States, except for less than one percent that were associated with discontinued operations in South Africa. See Note C of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for additional details of the Company's discontinued operations. The following table provides information regarding the Company's proved reserves as of December 31, 2013, 2012 and 2011:

	Summary of Oil and Gas Reserves as of Fiscal Year-End Based on Average Fiscal-Year Prices
	Reserve Volumes
	Oil (MBBLs)	NGLs (MBBLs)	Gas (MMCF) (a)	Total (MBOE)	%
December 31, 2013:
Developed	256,638	148,161	1,703,667	688,743	81	%
Undeveloped	85,467	37,261	202,674	156,507	19	%
Total proved reserves	342,105	185,422	1,906,341	845,250	100	%
Less proved reserves associated with discontinued operations	24,128	10,210	80,113	47,690	6	%
Total proved reserves associated with continuing operations	317,977	175,212	1,826,228	797,560	94	%
December 31, 2012:
Developed	230,700	134,637	1,605,209	632,872	58	%
Undeveloped	256,138	97,939	592,271	452,789	42	%
Total proved reserves	486,838	232,576	2,197,480	1,085,661	100	%
Less proved reserves associated with discontinued operations	48,274	24,137	158,307	98,796	9	%
Total proved reserves associated with continuing operations	438,564	208,439	2,039,173	986,865	91	%
December 31, 2011:
Developed	190,206	120,405	1,853,363	619,506	58	%
Undeveloped	239,799	90,630	677,675	443,375	42	%
Total proved reserves	430,005	211,035	2,531,038	1,062,881	100	%
Less proved reserves associated with discontinued operations	32,301	13,011	117,299	64,862	6	%
Total proved reserves associated with continuing operations	397,704	198,024	2,413,739	998,019	94	%

 ______________________

(a) Total proved gas reserves contain 240,093 MMCF, 280,344 MMCF and 301,123 MMCF of gas that the Company expected to be produced and used as field fuel (primarily for compressors) before the gas is delivered to a sales point, as of December 31, 2013, 2012 and 2011, respectively.

The Company's Standardized Measure of total proved reserves as of December 31, 2013 was $7.3 billion, including $6.3 billion and $1.0 billion of proved developed and proved undeveloped, respectively. The Company's Standardized Measure of total proved reserves as of December 31, 2012 was $6.4 billion, including $5.0 billion and $1.4 billion of proved developed and proved undeveloped, respectively. The Company's Standardized Measure of total proved reserves as of December 31, 2011 was $7.8 billion, including $5.5 billion and $2.3 billion of proved developed and proved undeveloped, respectively.

See the "Unaudited Supplementary Information" section included in "Item 8. Financial Statements and Supplementary Data" for additional details of the estimated quantities of the Company's proved reserves, including explanations for material changes in proved developed and proved undeveloped reserves.

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PIONEER NATURAL RESOURCES COMPANY

Description of Properties

The following tables summarize the Company's development and exploration/extension drilling activities during 2013:

	Development Drilling
	Beginning Wells In Progress	Wells Spud	Successful Wells	Unsuccessful Wells	Ending Wells In Progress
Permian Basin	136	311	387	1	59
South Texas—Eagle Ford Shale	11	45	40	—	16
Mid-Continent	—	11	11	—	—
Total continuing operations	147	367	438	1	75
Barnett Shale	—	4	3	—	1
Alaska	4	3	3	—	4
Total including discontinued operations	151	374	444	1	80

	Exploration/Extension Drilling
	Beginning Wells In Progress	Wells Spud	Successful Wells	Unsuccessful Wells	Wells Sold	Ending Wells In Progress
Permian Basin	17	128	114	—	—	31
South Texas—Eagle Ford Shale	21	95	92	—	—	24
South Texas—Edwards and Austin Chalk	—	1	1	—	—	—
Other	—	5	—	2	—	3
Total continuing operations	38	229	207	2	—	58
Barnett Shale	9	52	37	6	1	17
Alaska	2	1	—	1	—	2
Total including discontinued operations	49	282	244	9	1	77

The following table summarizes the Company's average daily oil, NGL, gas and total production by asset area during 2013:

	Oil (BBLs)	NGLs (BBLs)	Gas (MCF) (a)	Total (BOE)
Permian Basin	52,596	15,196	70,766	79,586
South Texas—Eagle Ford Shale	13,737	10,421	80,458	37,568
Raton Basin	—	—	134,591	22,432
Mid-Continent	3,020	6,801	40,475	16,567
South Texas—Edwards and Austin Chalk	171	2	30,685	5,287
Other	3	2	69	16
Total continuing operations	69,527	32,422	357,044	161,456
Barnett Shale	1,492	3,193	23,443	8,592
Alaska	4,201	—	—	4,201
Total including discontinued operations	75,220	35,615	380,487	174,249

 _____________________

(a) Gas production excludes gas produced and used as field fuel.

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PIONEER NATURAL RESOURCES COMPANY

The following table summarizes the Company's costs incurred by asset area during 2013:

	Property Acquisition Costs						Exploration Costs		Development Costs			Asset Retirement Obligations
	Proved			Unproved											Total
	(in thousands)
Permian Basin	$	3,550		$	50,082		$	677,528	$	1,043,600		$	28,921		$	1,803,681
Mid-Continent	18			218			2,633		17,561			983			21,413
Raton Basin	—			—			5,119		7,582			(15,847		)	(3,146		)
South Texas—Eagle Ford Shale	35			1,711			372,065		208,507			589			582,907
South Texas—Edwards and Austin Chalk	(32		)	(17		)	3,171		3,892			3,032			10,046
Other	10			3,527			23,351		1			74			26,963
Total continuing operations	$	3,581		$	55,521		$	1,083,867	$	1,281,143		$	17,752		$	2,441,864
Barnett Shale	9,280			7,641			135,441		49,664			(109		)	201,917
Alaska	—			—			68,604		140,557		(a)	(5,129		)	204,032
Total including discontinued operations	$	12,861		$	63,162		$	1,287,912	$	1,471,364		$	12,514		$	2,847,813

 ____________________

(a) Includes $7.1 million of capitalized interest associated with the Oooguruk development project.

Permian Basin

Spraberry field. The Spraberry field was discovered in 1949, encompasses eight counties in West Texas and the Company believes it is the largest oil field in the United States. The field is approximately 150 miles long and 75 miles wide at its widest point. The oil produced is West Texas Intermediate Sweet, and the gas produced is casinghead gas with an average energy content of 1,400 BTU. The oil and gas are produced primarily from six formations, the upper and lower Spraberry, the Dean, the Wolfcamp, the Strawn and the Atoka, at depths ranging from 6,700 feet to 11,300 feet. The Company believes the Spraberry and Wolfcamp formations offer excellent horizontal drilling opportunities to grow oil and gas production because of the significant resource in place and numerous undeveloped drilling locations. The Company expects to improve the incremental recovery rates in the Spraberry field through horizontal, infill and deeper formation drilling while containing operating expenses and drilling costs through economies of scale and vertical integration of field services.

During 2013, the Company drilled 502 wells in the Spraberry field and its total acreage position now approximates 823,000 gross acres (717,000 net acres). The Company currently has 29 rigs operating in the Spraberry field, of which 11 are drilling vertical wells and 18 are drilling horizontal wells, and has plans to add an additional six horizontal drilling rigs by the end of the first quarter of 2014. During 2014, the Company expects to drill approximately 200 vertical wells and 255 horizontal wells, with the horizontal wells being principally drilled in the Wolfcamp Shale horizon. The Company expects to spend $2.4 billion of drilling capital in the Spraberry field during 2014.

The Company believes it has significant resource potential within its acreage based on its extensive geologic data covering the Spraberry and Wolfcamp A, B, C and D intervals and its drilling results to-date. During 2013, the Company completed 21 wells in the northern portion of the play and 100 horizontal wells in the southern portion of the play. In 2014, the Company expects to drill 140 horizontal wells in the northern portion of the play and 115 horizontal wells in the southern portion of the play.

During 2013, the Company initiated horizontal Wolfcamp Shale drilling activities in the northern portion of its Spraberry acreage position to delineate the area. Wells drilled in the northern portion of the play were expected to benefit from greater original oil in place and higher reservoir pressures associated with deeper drilling depths. During 2013, the Company placed on production nine Wolfcamp B interval wells, four Wolfcamp D interval wells, five Lower Spraberry Shale interval wells, two Jo Mill Shale interval wells and one Wolfcamp A interval well with encouraging results. The Company’s drilling is currently focused in Midland, Martin, Glasscock and Andrews counties. The wells in these areas are expected to be drilled on three-well pads to gain efficiencies; therefore, the wells will not be completed until after the last well on each pad is drilled and, accordingly, production from these wells is not expected until all wells on the pad are ready to produce. With the addition of drilling rigs during the first quarter of 2014, combined with the effects of pad drilling, the Company expects production growth to be weighted towards the second half of 2014.

The Company continues to drill vertically to deeper intervals in the Spraberry field below the Wolfcamp interval, including the Strawn and Atoka intervals. The 2013 drilling program reflected 90 percent of the vertical wells being deepened below the Wolfcamp interval. The Company expects to drill approximately 200 vertical wells targeting deeper intervals during 2014. These wells are also being drilled to meet continuous drilling obligations.

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PIONEER NATURAL RESOURCES COMPANY

In January 2013, the Company signed an agreement with Sinochem, an unaffiliated third party, to sell 40 percent of Pioneer's interest in 207,000 net acres leased by the Company in the horizontal Wolfcamp Shale play in the southern portion of the Spraberry field for consideration of $1.8 billion. In May 2013, the Company completed the sale to Sinochem for net cash proceeds of $623.8 million, resulting in a 2013 gain of $181.3 million related to the unproved property interests conveyed to Sinochem. Sinochem is paying the remaining $1.2 billion of the transaction price by carrying 75 percent of Pioneer's portion of ongoing drilling and facilities costs attributable to the Company's joint operations with Sinochem in the horizontal Wolfcamp Shale play. Associated with the closing of the joint venture transaction, the Company conveyed a 40 percent interest in the producing horizontal Wolfcamp Shale wells in the joint venture area.

The Company plans to drill 115 horizontal wells during 2014 in the joint interest area. The Company drilled 100 horizontal Wolfcamp Shale wells during 2013 and had capital expenditures of $454.1 million in 2013. The 2014 drilling program will be focused on drilling in the higher return areas in northern Upton and Reagan counties, with approximately two-thirds of the wells being completed in the Wolfcamp B interval and the remainder being a mix of Wolfcamp A, C and D interval wells.

Sinochem also elected to participate in certain vertical wells that were drilled in the joint interest area after the December 1, 2012 effective date and received its share of production and costs from the Wolfcamp and deeper horizons based on the reserve contribution from the Wolfcamp and deeper intervals relative to reserves from all completed intervals. Pioneer's and Sinochem's participation in vertical wells is based on each party's interest without any drilling carry applied. Pioneer retained 100 percent of its vertical production in the joint interest area for wells drilled before the December 1, 2012 effective date. Pioneer also retained its current working interests in all horizons shallower than the Wolfcamp horizon and continues as operator of the properties in the joint interest area.

The Company continues to benefit from its integrated services to control drilling and operating costs and support the execution of its drilling and production activities in the Spraberry field. The Company owns 15 vertical drilling rigs and is currently utilizing seven Company-owned fracture stimulation fleets totaling approximately 170,000 horsepower in the Spraberry field (see Note C of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for additional information about the Company's plan to sell its vertical drilling rig business). To support its growing operations, the Company also owns other field service equipment, including pulling units, fracture stimulation tanks, water transport trucks, hot oilers, blowout preventers, construction equipment and fishing tools. In addition, Premier Silica (the Company's wholly-owned sand mining subsidiary) is supplying brown sand for proppant, which is being used to fracture stimulate vertical and horizontal wells in the Spraberry and Wolfcamp Shale intervals.

Mid-Continent

Hugoton field. The Hugoton field in southwest Kansas is one of the largest producing gas fields in the continental United States. The gas is produced from the Chase and Council Grove formations at depths ranging from 2,700 feet to 3,000 feet. The Company's Hugoton properties are located on 268,000 gross acres (235,000 net acres), covering approximately 400 square miles. The Company has working interests in approximately 1,200 wells in the Hugoton field, approximately 1,000 of which it operates.

The Company operates substantially all of the gathering and processing facilities, including the Satanta plant, which processes the production from the Hugoton field. In January 2011, the Company sold a 49 percent interest in the Satanta plant to an unaffiliated third party for the third party's commitment to dedicate gas volumes to the Satanta plant. This agreement has increased the Satanta plant's processing volumes and is expected to increase its economic longevity. The Company is also exploring opportunities to process other gas production in the Hugoton area at the Satanta plant. By maintaining operatorship of the gathering and processing facilities, the Company is able to control the production, gathering, processing and sale of its Hugoton field gas and NGL production.

West Panhandle field. The West Panhandle properties are located in the panhandle region of Texas. These stable, long-lived reserves are attributable to the Red Cave, Brown Dolomite, Granite Wash and fractured Granite formations at depths no greater than 3,500 feet. The Company's gas has an average energy content of 1,365 BTU and is produced from approximately 700 wells on more than 246,000 gross acres (239,000 net acres) covering over 375 square miles. The Company controls 100 percent of the wells, production equipment, gathering system and the Fain gas processing plant for the field. As this field is characterized by very low reservoir pressure, Pioneer continually works to improve compressor and gathering system efficiency.

Raton Basin

The Raton Basin properties are located in the southeast portion of Colorado. The Company owns 198,000 gross acres (178,000 net acres) in the center of the Raton Basin and produces CBM gas from the coal seams in the Vermejo and Raton formations from approximately 2,300 wells. The Company owns the majority of the well servicing and fracture stimulation equipment that it utilizes in the Raton field, allowing it to control costs and ensure availability. See Note D of Notes to Consolidated Financial

36

PIONEER NATURAL RESOURCES COMPANY

Statements included in "Item 8. Financial Statements and Supplementary Data" for additional information about the impairment charge recorded during 2013 to reduce the carrying value of the Company's gas properties in the Raton field.

South Texas Eagle Ford Shale

The Company's drilling activities in the South Texas area during 2013 continued to be primarily focused on delineation and development of Pioneer's substantial acreage position in the Eagle Ford Shale play. The 2013 drilling program was focused on liquids-rich drilling, with no wells drilled in dry gas acreage.

The Company completed 132 horizontal Eagle Ford Shale wells during 2013, all of which were successful, with average lateral lengths of 5,300 feet and, on average, 15-stage fracture stimulations. Additionally, the Company completed its first successful Upper Eagle Ford Shale well and estimates that approximately 25 percent of the Company's acreage is prospective for this interval in the Eagle Ford Shale play. The Company plans to spend $545 million of drilling capital in 2014 to drill approximately 110 Eagle Ford Shale wells. The Company has been using two Pioneer-owned fracture stimulation fleets during 2013 in the Eagle Ford Shale area and plans to continue that usage in 2014.

The Company's drilling operations in the Eagle Ford Shale continue to focus on improving drilling efficiencies. The Company has added approximately 300 drilling locations in the liquids-rich area of the play as a result of downspacing from 1,000 feet between wells (120-acre spacing) to 500 feet (60-acre spacing) between wells. Further downspacing and staggered testing to 175 feet between wells is underway in the liquids-rich areas where the 500-foot spacing was successful. Some areas will include testing of the Lower Eagle Ford Shale interval only, while others will include a combination of the Lower and Upper intervals. Early results from the initial 300-foot downspacing and staggered test in the Lower Eagle Ford Shale continue to be encouraging with five downspaced wells performing consistently with offset 500-foot spaced wells. The number of wells drilled from pads, as opposed to single-well locations, increased from about 45 percent of the Eagle Ford Shale wells during 2012 to about 80 percent in 2013, reflecting that most of the Company's acreage is now held by production. Pad drilling saves the Company a significant amount of capital costs per well, as compared to single-well location drilling. Pad sizes generally range from two wells to six wells. In 2014, most Eagle Ford Shale wells will be drilled utilizing three-well and four-well pads. None of the wells are completed until all of the wells on a pad are drilled. Therefore, the time between when the first well on a pad is spud and when the pad is placed on production is dependent on how many wells are drilled from the pad.

Over the past two years, the Company has been testing the use of lower-cost white sand instead of ceramic proppant to fracture stimulate wells drilled in shallower areas of the field. The Company is expanding the use of white sand proppant to deeper areas of the field to further define its performance limits. Early well performance has been similar to direct offset ceramic-stimulated wells. The Company fracture stimulated 100 wells with white sand proppant during 2013, with significant capital savings per well. The Company is continuing to monitor the performance of these wells and expects that the majority of its 2014 drilling program in the Eagle Ford Shale area will use lower-cost white sand proppant.

During June 2010, the Company entered into an Eagle Ford Shale joint venture transaction. Pursuant to the transaction, the Company entered into a purchase and sale agreement to sell 45 percent of its Eagle Ford Shale proved and unproved oil and gas properties to an unaffiliated third party for $212.0 million of cash proceeds. Under the terms of the transaction, the purchaser also paid a 75 percent carry obligation of $886.8 million to cover a portion of the Company's share of exploration, drilling and completion costs attributable to the Eagle Ford Shale assets during the period from June 2010 through December 2012. As of December 31, 2012, the purchaser's carry obligation was satisfied.

The Company owns a 50.1 percent member interest in EFS Midstream LLC ("EFS Midstream"), an entity formed by the Company to own and operate gas and liquids gathering, treating and transportation assets in the Eagle Ford Shale play. The Company does not have control of EFS Midstream and accounts for its investment in EFS Midstream under the equity method of accounting for investments in unconsolidated affiliates. EFS Midstream is obligated to construct midstream assets in the Eagle Ford Shale area. The majority of the construction of the midstream assets has been completed. Eleven of the 13 planned central gathering plants were completed as of December 31, 2013. EFS Midstream is providing gathering, treating and transportation services for the Company during a 20-year contractual term. During 2011, EFS Midstream entered into a $300 million, five-year revolving credit facility that is available to fund infrastructure investments, distributions or working capital needs to the extent such uses exceed EFS Midstream's operating cash flows.

Barnett Shale

During the fourth quarter of 2013, the Company committed to a plan to divest of its net assets in the Barnett Shale field in North Texas. The plan is expected to result in the sale of the Barnett Shale net assets during 2014. The Company classified the Barnett Shale field assets and liabilities as held for sale in the Company's accompanying consolidated balance sheet as of December 31, 2013. Associated with the plan to sell the Barnett Shale field, the Company recorded a noncash impairment charge of $189.5 million during December 2013 to reduce the carrying value of the Barnett Shale net assets to their estimated fair value less costs

37

PIONEER NATURAL RESOURCES COMPANY

to sell. Historical results of operations from the Company's Barnett Shale field, and the related impairment loss, are reported as discontinued operations, net of tax in the Company's accompanying consolidated statements of operations.

See Note C of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for additional information about the Company's plan to sell its Barnett Shale assets.

Alaska

During the fourth quarter of 2013, the Company committed to a plan to sell 100 percent of the capital stock in Pioneer Alaska, representing all the Company's net assets in Alaska including the Company's 70 percent working interest in the Oooguruk project.The sale of Pioneer Alaska continues to be subject to ongoing negotiations and certain other conditions, such as governmental approvals and buyer's arrangement of financing. The assets and liabilities of Pioneer Alaska are classified as held for sale in the Company's accompanying consolidated balance sheet as of December 31, 2013. Associated with the planned sale of Pioneer Alaska, the Company recorded a noncash impairment charge of $539.8 million during December 2013 to reduce the carrying value of the Pioneer Alaska assets to their estimated fair value less costs to sell of $350.6 million. Pioneer Alaska's historical results of operations, and the related impairment loss, are reported as discontinued operations, net of tax in the Company's accompanying consolidated statements of operations.

See Notes C and F of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for additional information about the Company's planned divestiture and exploration projects in Alaska, respectively.

The Company's plans to sell the Barnett Shale net assets and Pioneer Alaska are in differing stages of marketing and negotiation. No assurance can be given that the sales will be completed in accordance with the Company's plans.

International

During August 2012 and February 2011, the Company completed the sales of Pioneer South Africa and Pioneer Tunisia, respectively, to different unaffiliated third parties. See Note C of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for information regarding the sale of Pioneer South Africa and Pioneer Tunisia. As a result of these sales, the Company no longer has operations outside the United States.

Selected Oil and Gas Information

The following tables set forth selected oil and gas information for the Company as of and for each of the years ended December 31, 2013, 2012 and 2011. Because of normal production declines, increased or decreased drilling activities and the effects of acquisitions or divestitures, the historical information presented below should not be interpreted as being indicative of future results.

Production, price and cost data. The price that the Company receives for the oil and gas it produces is largely a function of market supply and demand. Demand is affected by general economic conditions, weather and other seasonal conditions, including hurricanes and tropical storms. Over or under supply of oil or gas can result in substantial price volatility. Historically, commodity prices have been volatile and the Company expects that volatility to continue in the future. A substantial or extended decline in oil or gas prices or poor drilling results could have a material adverse effect on the Company's financial position, results of operations, cash flows, quantities of oil and gas reserves that may be economically produced and the Company's ability to access capital markets.

The following tables set forth production, price and cost data with respect to the Company's properties for 2013, 2012 and 2011. These amounts represent the Company's historical results from operations without making pro forma adjustments for any acquisitions, divestitures or drilling activity that occurred during the respective years. The production amounts will not match the proved reserve volume tables in the "Unaudited Supplementary Information" section included in "Item 8. Financial Statements and Supplementary Data" because field fuel volumes are included in the proved reserve volume tables.

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PIONEER NATURAL RESOURCES COMPANY

PRODUCTION, PRICE AND COST DATA

	Year Ended December 31, 2013
	Included in Continuing Operations									Included in Discontinued Operations			Total
	Spraberry Field			Eagle Ford Shale Field		Raton Field		Total Company Fields		United States
Production information:
Annual sales volumes:
Oil (MBBLs)	19,176			5,014		—		25,377		2,078			27,455
NGLs (MBBLs)	5,410			3,804		—		11,834		1,165			12,999
Gas (MMCF)	24,679			29,367		49,126		130,321		8,557			138,878
Total (MBOE)	28,699			13,712		8,188		58,931		4,669			63,601
Average daily sales volumes:
Oil (BBLs)	52,537			13,737		—		69,527		5,693			75,220
NGLs (BBLs)	14,822			10,421		—		32,422		3,193			35,615
Gas (MCF)	67,614			80,458		134,591		357,044		23,443			380,487
Total (BOE)	78,627			37,568		22,432		161,456		12,793			174,249
Average prices:
Oil (per BBL)	$	93.30		$	91.74	$	—	$	92.62	$	98.81		$	93.09
NGL (per BBL)	$	30.34		$	26.72	$	—	$	30.24	$	25.31		$	29.79
Gas (per MCF)	$	3.23		$	3.63	$	3.27	$	3.43	$	3.00		$	3.41
Revenue (per BOE)	$	70.84		$	48.73	$	19.61	$	53.55	$	55.79		$	53.71
Average costs (per BOE):
Production costs:
Lease operating	$	11.38		$	3.23	$	6.25	$	8.00	$	15.93		$	8.58
Third-party transportation charges	0.24			3.86		3.02		1.56		1.67			1.57
Net natural gas plant/gathering	(1.11		)	0.01		1.90		0.10		(0.95		)	0.02
Workover	1.45			0.20		—		0.77		2.70			0.91
Total	$	11.96		$	7.30	$	11.17	$	10.43	$	19.35		$	11.08
Production and ad valorem taxes:
Ad valorem	$	1.70		$	0.65	$	0.42	$	1.22	$	1.68		$	1.25
Production	3.45			1.31		0.35		2.20		0.50			2.07
Total	$	5.15		$	1.96	$	0.77	$	3.42	$	2.18		$	3.32
Depletion expense	$	18.47		$	8.80	$	18.97	$	14.70	$	21.49		$	15.20

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PIONEER NATURAL RESOURCES COMPANY

PRODUCTION, PRICE AND COST DATA - (Continued)

	Year Ended December 31, 2012
	Included in Continuing Operations									Included in Discontinued Operations
	Spraberry Field			Eagle Ford Shale Field		Raton Field		Total Company Fields		United States			South Africa		Total
Production information:
Annual sales volumes:
Oil (MBBLs)	16,096			3,613		—		20,922		2,006			157		23,085
NGLs (MBBLs)	4,451			2,683		—		9,904		1,009			—		10,913
Gas (MMCF)	21,345			23,182		54,822		131,132		7,351			3,784		142,267
Total (MBOE)	24,104			10,160		9,137		52,682		4,239			787		57,708
Average daily sales volumes:
Oil (BBLs)	43,978			9,871		—		57,165		5,480			428		63,073
NGLs (BBLs)	12,160			7,332		—		27,060		2,756			—		29,816
Gas (MCF)	58,319			63,338		149,787		358,284		20,085			10,340		388,709
Total (BOE)	65,858			27,759		24,965		143,939		11,583			2,151		157,673
Average prices, including hedge results and amortization of deferred VPP revenue (a):
Oil (per BBL)	$	90.57		$	93.84	$	—	$	90.67	$	93.20		$	108.62	$	91.01
NGL (per BBL)	$	32.23		$	31.81	$	—	$	34.04	$	30.86		$	—	$	33.75
Gas (per MCF)	$	2.58		$	2.81	$	2.41	$	2.60	$	2.49		$	8.50	$	2.75
Revenue (per BOE)	$	68.72		$	48.18	$	14.48	$	48.88	$	55.75		$	62.48	$	49.57
Average prices, excluding hedge results and amortization of deferred VPP revenue (a):
Oil (per BBL)	$	87.95		$	93.84	$	—	$	88.81	$	93.20		$	108.62	$	89.32
NGL (per BBL)	$	32.23		$	31.81	$	—	$	34.04	$	30.86		$	—	$	33.75
Gas (per MCF)	$	2.58		$	2.81	$	2.41	$	2.60	$	2.49		$	8.50	$	2.75
Revenue (per BOE)	$	66.97		$	48.18	$	14.48	$	48.15	$	55.75		$	62.48	$	48.90
Average costs (per BOE):
Production costs:
Lease operating	$	11.33		$	3.21	$	6.47	$	7.91	$	16.28		$	2.86	$	8.46
Third-party transportation charges	0.17			3.00		3.12		1.31		1.33			—		1.29
Net natural gas plant/gathering	(0.49		)	—		1.82		0.54		(0.40		)	—		0.47
Workover	1.71			0.08		—		0.83		1.10			—		0.84
Total	$	12.72		$	6.29	$	11.41	$	10.59	$	18.31		$	2.86	$	11.06
Production and ad valorem taxes:
Ad valorem	$	1.78		$	0.71	$	0.17	$	1.22	$	1.69		$	—	$	1.24
Production	3.47			2.00		0.11		2.17		0.44			—		2.01
Total	$	5.25		$	2.71	$	0.28	$	3.39	$	2.13		$	—	$	3.25
Depletion expense	$	15.58		$	5.51	$	19.52	$	12.82	$	23.37		$	—	$	13.42

 _____________________

(a) The Company records the amortization of deferred VPP revenue at a field level but does not record the results of its hedging activities at a field level. As of December 31, 2012, the Company had no further obligation to deliver oil under the VPP and did not have any hedging activities.

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PIONEER NATURAL RESOURCES COMPANY

PRODUCTION, PRICE AND COST DATA - (Continued)

	Year Ended December 31, 2011
	Included in Continuing Operations									Included in Discontinued Operations
	Spraberry Field			Eagle Ford Shale Field		Raton Field		Total Company Fields		United States		South Africa		Tunisia			Total
Production information:
Annual sales volumes:
Oil (MBBLs)	10,011			1,600		—		12,989		1,836		193		201			15,219
NGLs (MBBLs)	3,844			1,088		—		7,708		500		—		—			8,208
Gas (MMCF)	15,899			10,227		58,601		121,496		4,020		7,508		181			133,205
Total (MBOE)	16,505			4,393		9,767		40,947		3,006		1,445		229			45,627
Average daily sales volumes:
Oil (BBLs)	27,428			4,383		—		35,587		5,031		530		547			41,695
NGLs (BBLs)	10,530			2,982		—		21,119		1,368		—		—			22,487
Gas (MCF)	43,559			28,020		160,550		332,866		11,013		20,570		496			364,945
Total (BOE)	45,218			12,035		26,758		112,184		8,234		3,958		630			125,006
Average prices, including hedge results and amortization of deferred VPP revenue (a):
Oil (per BBL)	$	95.93		$	89.02	$	—	$	96.60	$	96.58	$	108.14	$	99.03		$	96.78
NGL (per BBL)	$	42.38		$	48.21	$	—	$	46.31	$	45.64	$	—	$	—		$	46.27
Gas (per MCF)	$	3.44		$	3.93	$	3.81	$	3.86	$	3.41	$	7.62	$	13.04		$	4.07
Revenue (per BOE)	$	71.37		$	53.51	$	22.86	$	50.80	$	71.15	$	54.09	$	96.29		$	52.48
Average prices, excluding hedge results and amortization of deferred VPP revenue (a):
Oil (per BBL)	$	91.44		$	89.02	$	—	$	90.61	$	96.58	$	108.14	$	99.03		$	91.67
NGL (per BBL)	$	42.38		$	48.21	$	—	$	46.31	$	45.64	$	—	$	—		$	46.27
Gas (per MCF)	$	3.44		$	3.93	$	3.81	$	3.86	$	3.41	$	7.62	$	13.04		$	4.07
Revenue (per BOE)	$	68.65		$	53.51	$	22.86	$	48.90	$	71.15	$	54.09	$	96.29		$	50.77
Average costs (per BOE):
Production costs:
Lease operating	$	10.40		$	5.45	$	6.49	$	7.59	$	14.75	$	2.35	$	7.61		$	7.90
Third-party transportation charges	—			2.77		3.01		1.14		0.86		—		1.91			1.22
Net natural gas plant/gathering	(1.45		)	—		2.15		0.16		—		—		—			0.14
Workover	1.74			0.02		—		0.80		1.08		—		(0.27		)	0.78
Total	$	10.69		$	8.24	$	11.65	$	9.69	$	16.69	$	2.35	$	9.25		$	10.04
Production and ad valorem taxes:
Ad valorem	$	1.73		$	0.27	$	0.41	$	1.17	$	2.22	$	—	$	—		$	1.20
Production	3.87			2.64		0.31		2.23		0.52		—		—			2.04
Total	$	5.60		$	2.91	$	0.72	$	3.40	$	2.74	$	—	$	—		$	3.24
Depletion expense	$	11.41		$	6.40	$	14.46	$	11.33	$	29.15	$	29.00	$	—		$	13.01

 ____________________

(a) The Company records the amortization of deferred VPP revenue at a field level but does not record the results of its hedging activities at a field level.

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PIONEER NATURAL RESOURCES COMPANY

Productive wells. Productive wells consist of producing wells and wells capable of production, including shut-in wells and gas wells awaiting pipeline connections to commence deliveries and oil wells awaiting connection to production facilities. One or more completions in the same well bore are counted as one well. Any well in which one of the multiple completions is an oil completion is classified as an oil well.

The following table sets forth the number of productive oil and gas wells attributable to the Company's properties as of December 31, 2013:

PRODUCTIVE WELLS

	Gross Productive Wells			Net Productive Wells
	Oil	Gas	Total	Oil	Gas	Total
Continuing operations	6,928	4,989	11,917	6,146	4,430	10,576
Discontinued operations	28	125	153	20	119	139
Total	6,956	5,114	12,070	6,166	4,549	10,715

Leasehold acreage. The following table sets forth information about the Company's developed, undeveloped and royalty leasehold acreage as of December 31, 2013:

LEASEHOLD ACREAGE

	Developed Acreage		Undeveloped Acreage		Royalty Acreage
	Gross Acres	Net Acres	Gross Acres	Net Acres
Continuing operations	1,612,060	1,376,615	1,144,877	773,134	298,443
Discontinued operations	79,953	64,558	48,854	39,494	10,497
Total	1,692,013	1,441,173	1,193,731	812,628	308,940

The following table sets forth the expiration dates of the leases on the Company's gross and net undeveloped acres as of December 31, 2013:

	Acres Expiring (a)
	Gross	Net
2014	147,435	104,929
2015	107,383	72,453
2016	764,845	500,980
2017	112,794	77,613
2018	36,966	34,562
Thereafter	24,308	22,091
Total	1,193,731	812,628

 _____________________

(a) Acres expiring are based on contractual lease maturities.

42

PIONEER NATURAL RESOURCES COMPANY

Drilling and other exploratory and development activities. The following table sets forth the number of gross and net wells drilled by the Company during 2013, 2012 and 2011 that were productive or dry holes. This information should not be considered indicative of future performance, nor should it be assumed that there was any correlation between the number of productive wells drilled and the oil and gas reserves generated thereby or the costs to the Company of productive wells compared to the costs of dry holes.

DRILLING ACTIVITIES

	Gross Wells						Net Wells
	Year Ended December 31,						Year Ended December 31,
	2013		2012		2011		2013		2012		2011
Productive wells:
Development	444		659		725		382		595		661
Exploratory	244		223		167		164		144		115
Dry holes:
Development	1		10		11		1		6		10
Exploratory	9		6		1		6		6		1
Total	698		898		904		553		751		787
Success ratio (a)	99	%	98	%	99	%	99	%	98	%	99	%

 ______________________

(a) Represents the ratio of those wells that were successfully completed as producing wells or wells capable of producing to total wells drilled and evaluated.

Present activities. The following table sets forth information about the Company's wells that were in process of being drilled as of December 31, 2013:

	Gross Wells	Net Wells
Development	80	62
Exploratory	77	55
Total	157	117

ITEM 3. LEGAL PROCEEDINGS

The Company is party to various proceedings and claims incidental to its business. While many of these matters involve inherent uncertainty, the Company believes that the amount of the liability, if any, ultimately incurred with respect to such proceedings and claims will not have a material adverse effect on the Company's consolidated financial position as a whole or on its liquidity, capital resources or future annual results of operations. See Note J of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for additional information regarding legal proceedings involving the Company.

ITEM 4. MINE SAFETY DISCLOSURES

The Company's sand mines are subject to regulation by the Federal Mine Safety and Health Administration under the Federal Mine Safety and Health Act of 1977, as amended by the Mine Improvement and New Emergency Response Act of 2006. Information concerning mine safety violations or other regulatory matters required by Section 1503(a) of the Dodd-Frank Wall Street Reform and Consumer Protection Act and Item 104 of Regulation S-K is included in Exhibit 95.1 to this Annual Report filed on Form 10-K.

43

PIONEER NATURAL RESOURCES COMPANY

PART II

ITEM 5. MARKET FOR REGISTRANT'S COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES

The Company's common stock is listed and traded on the NYSE under the symbol "PXD." The Company's board of directors (the "Board") declared dividends to the holders of the Company's common stock of $0.04 per share during each of the first and third quarters of the years ended December 31, 2013 and 2012. The Board intends to consider the payment of dividends to the holders of the Company's common stock in the future. The declaration and payment of future dividends, however, will be at the discretion of the Board and will depend on, among other things, the Company's earnings, financial condition, capital requirements, level of indebtedness, statutory and contractual restrictions applying to the payment of dividends and other considerations that the Board deems relevant.

The following table sets forth quarterly high and low prices of the Company's common stock and dividends declared per share for the years ended December 31, 2013 and 2012:

	High		Low		Dividends Declared Per Share
Year ended December 31, 2013
Fourth quarter	$	227.42	$	172.60	$	—
Third quarter	$	190.15	$	146.19	$	0.04
Second quarter	$	157.81	$	109.19	$	—
First quarter	$	133.68	$	107.29	$	0.04
Year ended December 31, 2012
Fourth quarter	$	110.67	$	99.75	$	—
Third quarter	$	115.69	$	82.18	$	0.04
Second quarter	$	117.05	$	77.41	$	—
First quarter	$	119.19	$	90.26	$	0.04

On February 20, 2014, the last reported sales price of the Company's common stock, as reported in the NYSE composite transactions, was $189.60 per share.

As of February 20, 2014, the Company's common stock was held by 13,527 holders of record.

Purchases of Equity Securities by the Issuer and Affiliated Purchasers

The following table summarizes the Company's purchases of its common stock during the three months ended December 31, 2013:

Period	Total Number of Shares (or Units) Purchased (a)	Average Price Paid per Share (or Unit)		Total Number of  Shares (or Units) Purchased as Part of Publicly Announced Plans or Programs	Approximate Dollar Amount of Shares that May Yet Be Purchased under Plans or Programs
October 2013	243	$	201.35	—	—
November 2013	—	$	—	—	—
December 2013	—	$	—	—	—
Total	243	$	201.35	—	$	—

 ______________________

(a) Consists of shares purchased from employees in order for the employees to satisfy tax withholding payments related to share-based awards that vested during the period.

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PIONEER NATURAL RESOURCES COMPANY

ITEM 6. SELECTED FINANCIAL DATA

The following selected consolidated financial data of the Company as of and for each of the five years ended December 31, 2013 should be read in conjunction with "Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations" and "Item 8. Financial Statements and Supplementary Data."

	Year Ended December 31,
	2013			2012			2011		2010		2009
	(in millions, except per share data)
Statements of Operations Data:
Oil and gas revenues	$	3,155.7		$	2,575.3		$	2,080.2	$	1,528.0	$	1,283.5
Total revenues and other income	$	3,719.5		$	3,072.5		$	2,513.2	$	2,143.7	$	1,076.4
Total costs and expenses (a)	$	4,281.2		$	2,235.0		$	1,917.2	$	1,329.4	$	1,354.5
Income (loss) from continuing operations	$	(349.9	)	$	547.0		$	407.8	$	545.2	$	(178.6	)
Income (loss) from discontinued operations, net of tax (b)	$	(449.6	)	$	(304.2	)	$	474.1	$	100.8	$	136.3
Net income (loss) attributable to common stockholders	$	(838.4	)	$	192.3		$	834.5	$	605.2	$	(52.1	)
Income (loss) from continuing operations attributable to common stockholders per share:
Basic	$	(2.86	)	$	4.02		$	3.03	$	4.29	$	(1.65	)
Diluted	$	(2.86	)	$	3.91		$	2.97	$	4.24	$	(1.65	)
Net income (loss) attributable to common stockholders per share:
Basic	$	(6.16	)	$	1.54		$	7.01	$	5.14	$	(0.46	)
Diluted	$	(6.16	)	$	1.50		$	6.88	$	5.08	$	(0.46	)
Dividends declared per share	$	0.08		$	0.08		$	0.08	$	0.08	$	0.08
Balance Sheet Data (as of December 31):
Total assets	$	12,292.8		$	13,069.0		$	11,447.2	$	9,679.1	$	8,867.3
Long-term obligations	$	4,427.9		$	6,166.9		$	4,726.5	$	4,683.9	$	4,653.0
Total stockholders' equity	$	6,614.8		$	5,867.3		$	5,651.1	$	4,226.0	$	3,643.0

 ______________________

(a) During 2013 and 2011, the Company recognized impairment charges of $1.5 billion related to dry gas properties in the Raton field and $354.4 million related to its Edwards and Austin Chalk net assets in South Texas, respectively. See "Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations" and Note D of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for more information about the Company's impairment charges.

(b) During 2013, the Company committed to separate plans to divest of Pioneer Alaska and its assets in the Barnett Shale field. The Company recorded noncash impairment charges of $729.3 million during 2013 associated with the planned sales and $532.6 million during 2012 related to dry gas properties in the Barnett Shale field. During December 2011, the Company committed to a plan to divest Pioneer South Africa. During December 2010, the Company committed to a plan to sell Pioneer Tunisia and in February 2011 completed the sale of the Company's share holdings in Pioneer Tunisia, resulting in a gain of $645.2 million. During 2009, the Company recorded $119.3 million of income for the recovery of the excess royalties related to its Gulf of Mexico shelf properties, which were sold in 2006. The results of these operations which are in the process of being sold or were sold during the periods presented are classified as discontinued operations in accordance with GAAP. See Note C of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for more information about the Company's discontinued operations.

45

PIONEER NATURAL RESOURCES COMPANY

ITEM 7. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Financial and Operating Performance

Pioneer's financial and operating performance for 2013 included the following highlights:

• Net loss attributable to common stockholders was $838.4 million ($6.16 per diluted share) for the year ended December 31, 2013, as compared to net income attributable to common stockholders of $192.3 million ($1.50 per diluted share) in 2012. The $1.0 billion decrease in net income attributable to common stockholders is primarily comprised of an $897.0 million decrease in income from continuing operations and a $145.4 million increase in loss from discontinued operations, net of tax.

The primary components of the decrease in net income from continuing operations include:

• a $1.5 billion impairment charge to reduce the carrying value of the Company’s Raton gas field assets based on reductions in management's long-term gas price outlook (see Note D of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" and "Results of Operations" below);

• a $326.2 million decrease in net derivative gains, primarily as a result of changes in forward commodity prices and changes in the Company's portfolio of derivatives;

• a $79.1 million increase in total oil and gas production costs and production and ad valorem taxes, primarily due to a 12 percent increase in sales volumes;

• a $198.8 million increase in DD&A expense, primarily attributable to the aforementioned increase in sales volumes coupled with a decrease in Spraberry field proved undeveloped reserves as a result of removing vertical well locations that are no longer expected to be drilled as the Company shifts its capital resources to higher-rate-of-return horizontal drilling (see Supplementary Information included in "Item 8. Financial Statements and Supplementary Data");

• a $51.7 million increase in general and administrative expenses primarily due to growth in employee headcount in support of the Company's capital expansion initiatives, performance-related compensation expense and higher stock-based compensation expense associated with cash-settled restricted stock awards, which are classified as liabilities, as a result of increases in the market value of the Company's common stock; and

• a $23.2 million increase in other expense, primarily due to increases in impairment of inventory and other assets; partially offset by

• a $580.4 million increase in oil and gas revenues as a result of a 12 percent increase in total sales volumes and a 10 percent increase in average commodity prices received per BOE;

• a $502.3 million decrease in income tax provision due to the decline in income from continuing operations before income taxes;

• a $163.1 million increase in gain on disposition of assets, primarily due to the gain recorded on the Company's sale of a 40 percent interest in the Company's horizontal Wolfcamp Shale play in the southern portion of the Spraberry field in West Texas to Sinochem; and

• a $20.5 million decrease in interest expense, primarily due to a decline in outstanding borrowings.

The primary components of the increase in the loss from discontinued operations, net of tax, include:

• a $196.7 million increase in impairment provisions associated with the planned sales of Pioneer Alaska and the Company's Barnett Shale field assets ($729.3 million) as compared to the 2012 impairment of Barnett Shale field assets included in discontinued operations ($532.6 million); and

• a $32.0 million decrease in net gains on sales of portions of the Company's discontinued operations in the Barnett Shale, Alaska and South Africa assets; partially offset by

• a $68.4 million increase in income tax benefit.

During December 2013, the Company committed to a plan to sell Pioneer Alaska and the Company's Barnett Shale field assets. In accordance with GAAP, the Company has classified Pioneer Alaska and the Barnett Shale field assets and liabilities as discontinued operations held for sale in the Company's accompanying consolidated balance sheet as of December 31, 2013, and has recast Pioneer Alaska and the Barnett Shale field asset's results of operations as loss from discontinued operations, net of associated income taxes, in the accompanying consolidated statements of operations included in "Item 8. Financial Statements and Supplementary Data." Loss from discontinued operations, net of tax for the year ended December 31, 2013 includes (i) recognized noncash impairment charges totaling $729.3 million representing adjustments to reduce the carrying values of Pioneer Alaska and the Company's Barnett Shale field assets to their estimated fair values, partially offset by (ii) the results of discontinued operations (see Note C of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for more information about the Company's discontinued operations);

46

PIONEER NATURAL RESOURCES COMPANY

• Daily sales volumes from continuing operations increased on a BOE basis by 12 percent to 161,456 BOEPD during 2013, as compared to 143,939 BOEPD during 2012, primarily due to the success of the Company's drilling programs;

• Average reported oil and gas prices from continuing operations increased during 2013 to $92.62 per BBL and $3.43 per MCF, respectively, as compared to respective average reported prices of $90.67 per BBL and $2.60 per MCF during 2012. Average reported NGL prices from continuing operations decreased during 2013 to $30.24 per BBL, as compared to an average reported price of $34.04 per BBL during 2012;

• Average oil and gas production costs per BOE from continuing operations decreased during 2013 to $10.43 as compared to per BOE costs of $10.59 during 2012, primarily due to a decrease in net natural gas plant charges as a result of higher gas prices being realized on third-party volumes that are retained as processing fees in Company-owned facilities, partially offset by higher third-party transportation charges incurred on increasing sales volumes in the Eagle Ford Shale field. See "Results of Operations" below for more information about changes in production costs;

• Net cash provided by operating activities increased by $307.7 million, or 17 percent, to $2.1 billion for 2013, as compared to $1.8 billion during 2012, primarily due to the increases in oil and gas sales volumes and prices, partially offset by a $227.6 million decrease in cash receipts on settled derivative instruments; and

• As of December 31, 2013, the Company's net debt to book capitalization declined to 25 percent, as compared to 37 percent as of December 31, 2012, primarily due to (i) the February 2013 issuance of 10.35 million shares of the Company's common stock for $1.3 billion of cash proceeds, net of associated underwriting and offering expenses, and (ii) the May 2013 completion of the sale of a 40 percent interest in 207,000 net acres leased by the Company in the horizontal Wolfcamp Shale play in the southern portion of the Spraberry field in West Texas for $623.8 million of cash proceeds. The Company utilized a portion of the proceeds from these items to reduce long-term debt by $1.1 billion during 2013 and increase cash and cash equivalents by $163.3 million. The long-term debt reduction during 2013 included (i) the conversion of the Company's 2.875% Convertible Senior Notes (the "Convertible Senior Notes"), (ii) the repayment and termination of Pioneer Southwest's credit facility and (iii) the repayment of all amounts outstanding on the Company's credit facility.

First Quarter 2014 Outlook

Based on current estimates, the Company expects that first quarter 2014 production will average 166,000 to 171,000 BOEPD.

First quarter production costs (including production and ad valorem taxes and transportation costs) are expected to average $13.50 to $15.50 per BOE, based on current NYMEX strip prices for oil and gas. DD&A expense is expected to average $13.50 to $15.50 per BOE.

Total exploration and abandonment expense for the quarter is expected to be $25 million to $35 million. General and administrative expense is expected to be $70 million to $75 million. Interest expense is expected to be $44 million to $49 million, and other expense is expected to be $25 million to $35 million. Accretion of discount on asset retirement obligations is expected to be $3 million to $5 million.

The Company's first quarter effective income tax rate is expected to range from 35 percent to 40 percent, assuming current capital spending plans and no significant derivative MTM changes in the Company's derivative position. Cash income taxes are expected to be $5 million to $10 million and are primarily attributable to federal alternative minimum tax and state taxes.

2014 Capital Budget

Pioneer's capital program for 2014 totals $3.3 billion, consisting of $3.0 billion for drilling operations, including budgeted land capital for existing assets, and $285 million for other property and equipment. The 2014 budget excludes acquisitions, asset retirement obligations, capitalized interest, geological and geophysical general and administrative expense and capital expenditures associated with Pioneer Alaska and Barnett Shale field assets prior to their sale.

The 2014 drilling capital of $3.0 billion continues to be focused on oil- and liquids-rich drilling, with 97 percent of the capital allocated to the Spraberry field and the Eagle Ford Shale play. Following is a breakdown of the forecasted spending by asset area:

• Spraberry field - $2.4 billion, including (i) $205 million for drilling and facilities capital in the southern Wolfcamp joint interest area and (ii) $2.2 billion of capital in the northern Spraberry/Wolfcamp acreage, which includes $1.2 billion of horizontal drilling capital, $440 million of vertical drilling capital, $400 million for infrastructure, land and science and $100 million for gas processing facilities;

47

PIONEER NATURAL RESOURCES COMPANY

• Eagle Ford Shale – $545 million, including $480 million of horizontal drilling capital and $65 million for infrastructure and land; and

• Other spending – $100 million for other existing assets.

Pioneer's budgeted expenditures for other property and equipment in 2014 include:

• Buildings and other facilities – $160 million;

• Vertical integration capital – $100 million; and

• Vehicles and other equipment – $25 million.

The 2014 capital budget is expected to be funded from a combination of cash and cash equivalents, operating cash flow, proceeds from the sale of assets held for sale or from the sale of other nonstrategic assets and, if necessary, borrowings under the Company's credit facility.

Acquisitions

During 2013, 2012 and 2011, the Company spent $76.0 million, $157.5 million and $131.9 million, respectively, to acquire primarily undeveloped acreage for future exploitation and exploration activities. The 2013 and 2012 acquisitions primarily increased the Company's acreage positions in the West Texas Spraberry field. The 2011 acquisitions primarily increased the Company's acreage positions in the South Texas Eagle Ford Shale play, Barnett Shale play and West Texas Spraberry field. During 2013, the Company completed the acquisition of all of the outstanding common units of Pioneer Southwest not already owned by the Company in exchange for 0.2325 of a share of common stock of the Company per Pioneer Southwest common unit. Additionally, in 2012, the Company acquired Premier Silica for $297.1 million. See Note C of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for additional information about the Company's acquisitions.

Divestitures and Discontinued Operations

Alaska.During the fourth quarter of 2013, the Company committed to a plan to sell 100 percent of the capital stock in Pioneer Alaska. The sale of Pioneer Alaska continues to be subject to ongoing negotiations and certain other conditions, such as governmental approvals and buyer's arrangement of financing. Associated with the planned sale of Pioneer Alaska, the Company recorded a noncash impairment charge of $539.8 million in discontinued operations during December 2013 to reduce the carrying value of Pioneer Alaska to its estimated fair value less costs to sell of $350.6 million. The Company has classified Pioneer Alaska assets and liabilities as held for sale in the accompanying consolidated balance sheet as of December 31, 2013 and has reported Pioneer Alaska's historical results of operations, and the related impairment loss, as discontinued operations, net of tax in the Company's accompanying consolidated statements of operations.

Barnett Shale. During the fourth quarter of 2013, the Company committed to a plan to divest of its net assets in the Barnett Shale field in North Texas. The plan is expected to result in the sale of the Company's Barnett Shale net assets during 2014. The Company has classified its Barnett Shale field assets and liabilities as held for sale in the accompanying consolidated balance sheet as of December 31, 2013 and has reported the Company's Barnett Shale field historical results of operations, and the related impairment loss, as discontinued operations, net of tax in the Company's accompanying consolidated statements of operations.

Associated with the plan to sell its net assets in the Barnett Shale field, the Company recorded a noncash impairment charge of $189.5 million in discontinued operations during December 2013 to reduce the carrying value of its net assets in the Barnett Shale to their estimated fair value less costs to sell. Also included in discontinued operations in 2013 is the sale of the Company's interest in certain proved and unproved oil and gas properties in the Barnett Shale field for net cash proceeds of $33.8 million, which resulted in a gain of $8.7 million on the unproved properties sold.

Sendero.During December 2013, the Company committed to a plan to sell its majority interest in Sendero (the Company's vertical drilling rig subsidiary) to Sendero's minority interest owner for $31.0 million, subject to negotiating a definitive sales agreement and the buyer completing its financing arrangements. The Company classified these assets and liabilities as held for sale in the Company's accompanying consolidated balance sheet as of December 31, 2013.

The Company's plans to sell Pioneer Alaska, the Barnett Shale net assets and Sendero are in various stages of marketing or negotiation. No assurance can be given that the sales will be completed in accordance with the Company's plans.

Southern Wolfcamp. In January 2013, the Company signed an agreement with Sinochem to sell 40 percent of Pioneer's interest in 207,000 net acres leased by the Company in the horizontal Wolfcamp Shale play in the southern portion of the Spraberry field for total consideration of $1.8 billion. In May 2013, the Company completed the sale to Sinochem for net cash proceeds of $623.8 million, resulting in a gain of $181.3 million. Sinochem is paying the remaining $1.2 billion of the transaction price by

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PIONEER NATURAL RESOURCES COMPANY

carrying 75 percent of Pioneer's portion of ongoing drilling and facilities costs attributable to the Company's joint operations with Sinochem in the horizontal Wolfcamp Shale play.

Pioneer South Africa. During December 2011, the Company committed to a plan to sell Pioneer South Africa. During the first quarter of 2012, the Company agreed to sell Pioneer South Africa to an unaffiliated third party, effective January 1, 2012, for $60.0 million of cash proceeds before normal closing and other adjustments, and the buyer's assumption of certain liabilities of the Company's South Africa subsidiaries. In August 2012, the Company completed the sale of Pioneer South Africa for net cash proceeds of $15.9 million, including normal closing adjustments for cash revenues and costs and expenses from the effective date through the date of the sale, resulting in a gain of $28.6 million. Pioneer South Africa's historical results of operations, and the related gain recorded on the disposition of Pioneer South Africa, are reported as discontinued operations, net of tax in the Company's accompanying consolidated statements of operations.

Pioneer Tunisia. During December 2010, the Company committed to a plan to sell Pioneer Tunisia. In February 2011, the Company sold its share holdings in Pioneer Tunisia for cash proceeds of $802.5 million, excluding cash and cash equivalents sold, resulting in a gain of $645.2 million. Pioneer Tunisia's historical results of operations, and the related gain recorded on the disposition of Pioneer Tunisia, are reported as discontinued operations, net of tax in the Company's accompanying consolidated statements of operations.

See Note C of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for additional information about the Company's divestitures and discontinued operations.

Results of Operations

Oil and gas revenues. Oil and gas revenues from continuing operations totaled $3.2 billion, $2.6 billion and $2.1 billion during 2013, 2012 and 2011, respectively.

The increase in 2013 oil and gas revenues relative to 2012 is reflective of 22 percent and 20 percent increases in oil and NGL sales volumes, respectively, and two percent and 32 percent increases in average reported oil and gas prices, respectively. Partially offsetting the effects of these increases was a decline of 11 percent in average reported NGL prices.

The increase in 2012 oil and gas revenues relative to 2011 is reflective of 61 percent, 28 percent and 8 percent increases in oil, NGL, and gas sales volumes, respectively. Partially offsetting the effects of these production increases were declines of six percent, 26 percent and 33 percent in average reported oil, NGL and gas prices, respectively.

The following table provides average daily sales volumes from continuing operations for 2013, 2012 and 2011:

	Year Ended December 31,
	2013	2012	2011
Oil (BBLs)	69,527	57,165	35,587
NGLs (BBLs)	32,422	27,060	21,119
Gas (MCF)	357,044	358,284	332,866
Total (BOE)	161,456	143,939	112,184

Average daily BOE sales volumes from continuing operations in 2013 and 2012 increased by 12 percent and 28 percent, respectively, as compared to the daily sales volumes in the respective prior years, principally due to the Company's successful drilling programs. In 2012, the increase in average daily BOE sales was also attributable to declines in scheduled VPP deliveries. All VPP production volumes were delivered as of December 31, 2012 and there are no further obligations under the VPP contracts.

Production for the year ended December 31, 2013 was negatively impacted by (i) gas processing capacity limitations in the Spraberry field as a result of wet gas production for the Company and other industry participants growing faster than anticipated and (ii) severe winter weather during the fourth quarter. New Spraberry field gas processing facilities were completed and began processing gas in mid-April 2013. The gas processing capacity limitations negatively impacted sales volumes by approximately 600 BOEPD for the year ended December 31, 2013. Additionally, 2013 production was reduced by approximately 1,500 BOEPD, related to heavy icing and low temperatures during the fourth quarter primarily across Pioneer's leasehold position in the Spraberry/Wolfcamp area that resulted in extensive power outages, facility freeze-ups, trucking curtailments and limited access to production and drilling facilities. All of the affected wells have since been returned to production.

Production growth for 2012, as compared to 2011, was negatively impacted by gas processing capacity limitations in the Spraberry field as a result of wet gas production for the Company and other industry participants growing faster than anticipated. The gas processing capacity limitations negatively impacted average 2012 sales volumes by approximately 1,450 BOEPD.

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PIONEER NATURAL RESOURCES COMPANY

The following table provides average daily sales volumes from discontinued operations by geographic area and in total during 2013, 2012 and 2011:

	Year Ended December 31,
	2013	2012	2011
Oil (BBLs):
United States	5,693	5,480	5,031
South Africa	—	428	530
Tunisia	—	—	547
Worldwide	5,693	5,908	6,108
NGL (BBLs):
United States	3,193	2,756	1,368
Worldwide	3,193	2,756	1,368
Gas (MCF):
United States	23,443	20,085	11,013
South Africa	—	10,340	20,570
Tunisia	—	—	496
Worldwide	23,443	30,425	32,079
Total (BOE):
United States	12,793	11,583	8,234
South Africa	—	2,151	3,958
Tunisia	—	—	630
Worldwide	12,793	13,734	12,822

The oil, NGL and gas prices that the Company reports are based on the market prices received for the commodities. The following table provides the Company's average prices from continuing operations for 2013, 2012 and 2011:

	Year Ended December 31,
	2013		2012 (a)		2011 (a)
Oil (per BBL)	$	92.62	$	90.67	$	96.60
NGL (per BBL)	$	30.24	$	34.04	$	46.31
Gas (per MCF)	$	3.43	$	2.60	$	3.86
Total (per BOE)	$	53.55	$	48.88	$	50.80

 ____________________

(a) For the years ended December 31, 2012 and 2011, the Company's average realized oil prices per BBL were $88.81 and $90.61, respectively, and the average realized prices per BOE for the years ended December 31, 2012 and 2011 were $48.15 and $48.90, respectively. The average realized prices do not include the impact of transfers of the Company's deferred hedge gains and losses from Accumulated Other Comprehensive Income ("AOCI-Hedging") and the amortization of deferred VPP revenue. During the year ended December 31, 2012 and 2011, the Company transferred $3.2 million of deferred oil hedge losses and $32.9 million of deferred oil hedge gains, respectively, from AOCI-Hedging to oil revenue. The 2012 transfer represented all of the remaining AOCI-Hedging transfers to earnings. Amortization of deferred VPP revenue increased oil revenues by $42.1 million and $45.0 million during the years ended December 31, 2012 and 2011, respectively. As of December 31, 2012, all VPP production volumes had been delivered and there are no further obligations under VPP contracts.

Sales of purchased oil and gas. The Company periodically enters into pipeline capacity commitments in order to secure available oil and gas transportation capacity from the Company’s areas of production. The Company enters into oil and gas purchase transactions with third parties and separate sale transactions with third parties to satisfy unused pipeline capacity commitments and to diversify a portion of the Company's WTI oil sales to a Gulf Coast oil price. Revenues and expenses from these transactions are presented on a gross basis as the Company acts as a principal in the transaction by assuming the risk and rewards of ownership, including credit risk, of the oil and gas purchased and assuming responsibility to deliver the oil and gas volumes sold. Deficiency payments on excess pipeline capacity are included in other expense in the accompanying consolidated statements of operations. See Note N of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for further information on transportation commitment charges.

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PIONEER NATURAL RESOURCES COMPANY

Interest and other income. The Company's interest and other income from continuing operations was $17.0 million and $29.4 million during 2013 and 2011, respectively, and a loss of $1.0 million in 2012. The $18.0 million increase during 2013, as compared to 2012, is primarily attributable to a $7.1 million reduction in losses from vertical integration services, a $5.1 million increase in equity in earnings of EFS Midstream and $4.1 million of gains on deferred compensation plan assets. The $30.4 million decrease during 2012, as compared to 2011, is primarily attributable to a $27.9 million decrease in income from vertical integration services. See Note M of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for more information about the Company's interest and other income.

Derivative gains (losses), net. The Company utilizes commodity swap contracts, collar contracts and collar contracts with short puts in order to (i) reduce the effect of price volatility on the commodities the Company produces, sells or consumes, (ii) support the Company's annual capital budgeting and expenditure plans and (iii) reduce commodity price risk associated with certain capital projects. In 2009, the Company discontinued hedge accounting on all of its then-existing derivative contracts. Changes in the fair value of effective cash flow hedges prior to the Company's discontinuance of hedge accounting were recorded as a component of AOCI – Hedging in the equity section of the Company's consolidated balance sheets, and were transferred to earnings during the same periods in which the hedged transactions were recognized in the Company's earnings. Since 2009, the Company has recognized all changes in the fair values of its derivative contracts as gains or losses in the earnings of the periods in which they occur. All deferred oil hedge losses were transferred from AOCI-Hedging to earnings during the year ended December 31, 2012. Transfers of deferred hedge gains and losses associated with oil cash flow hedges from AOCI – Hedging to oil revenues for the years ended December 31, 2012 and 2011 resulted in a decrease of $3.2 million and an increase of $32.9 million, respectively, to oil revenue.

The following table summarizes the Company's net derivative gains or losses for the years ending December 31, 2013, 2012 and 2011 (in thousands):

	Year Ended December 31,
	2013			2012			2011
Noncash changes in fair value:
Oil derivative gains (losses)	$	(18,855	)	$	217,765		$	68,376
NGL derivative gains (losses)	(616		)	1,209			10,243
Gas derivative gains (losses)	(153,993		)	(290,058		)	179,787
Diesel derivative gains (losses)	—			(270		)	270
Marketing derivative gains (losses)	22			(22		)	—
Interest rate derivative gains (losses)	9,321			5,930			(33,206		)
Total noncash derivative gains (losses), net	(164,121		)	(65,446		)	225,470
Net cash receipts (payments) on settled derivative instruments:
Oil derivative receipts (payments)	11,579			4,139			(36,664		)
NGL derivative receipts (payments)	1,224			13,403			(15,418		)
Gas derivative receipts	155,014			402,981			183,010
Diesel derivative receipts	—			3,497			67
Marketing derivative receipts (payments)	(168		)	36			(17		)
Interest rate derivative receipts (payments)	482			(28,359		)	36,304
Total cash receipts on settled derivative instruments, net	168,131			395,697			167,282
Total derivative gains, net	$	4,010		$	330,251		$	392,752

The Company's open derivative contracts are subject to continuing market risk. See "Item 7A. Quantitative and Qualitative Disclosures About Market Risk" and Note E of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for more information about the Company's derivative contracts.

Gain (loss) on disposition of assets. The Company recorded net gains of $209.0 million and $45.9 million during 2013 and 2012, respectively, and a net loss on the disposition of assets of $3.6 million during 2011.

During 2013, the Company's primary gains on disposition of assets included a $181.3 million gain on the sale of a 40 percent interest in the Company's horizontal Wolfcamp Shale play in the southern portion of the Spraberry field in West Texas to Sinochem and a gain of $22.4 million on the sale of the Company's interest in unproved oil and gas properties adjacent to the Company's West Panhandle field operations. During 2012, the Company recorded a $42.6 million gain on the sale of a portion of its interest

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PIONEER NATURAL RESOURCES COMPANY

in an unproved oil and gas property in the Eagle Ford Shale field. During 2011, the net loss was primarily associated with losses on the sales of excess materials and supplies inventory, partially offset by gains on the sale of certain unproved properties.

Oil and gas production costs. The Company's oil and gas production costs from continuing operations totaled $614.7 million, $558.0 million and $397.0 million during 2013, 2012 and 2011, respectively. In general, lease operating expenses and workover expenses represent the components of oil and gas production costs over which the Company has management control, while third-party transportation charges represent the cost to transport volumes produced to a sales point. Net natural gas plant/gathering charges represent the net costs to gather and process the Company's gas, reduced by net revenues earned from gathering and processing of third party gas in Company-owned facilities.

Total oil and gas production costs per BOE for the year ended December 31, 2013 decreased by two percent as compared to 2012. The decrease in production costs per BOE during 2013 is primarily reflective of a $0.44 per BOE decrease in net natural gas plant charges as a result of higher gas prices being realized on third-party volumes that are retained as processing fees in Company-owned facilities. Partially offsetting the decrease in per BOE net natural gas plant charges was a $0.25 per BOE increase in third-party transportation charges, primarily associated with increasing Eagle Ford Shale sales volumes.

During 2012, total production costs per BOE increased by nine percent as compared to 2011. The increase in production costs per BOE during 2012 is primarily reflective of increases in lease operating expenses, third-party transportation charges and net natural gas plant/gathering charges. Lease operating costs increased by $0.32 per BOE during 2012 primarily due to an increase in salt water disposal costs (principally comprised of water hauling fees). The $0.17 per BOE increase in third-party transportation charges during 2012 is primarily due to gathering, treating and transportation costs associated with increasing sales volumes from the Company's successful drilling program in the Eagle Ford Shale field. Net natural gas plant charges increased by $0.38 per BOE during 2012 primarily due to a reduction in third-party revenues from processing third-party gas volumes in Company-owned facilities as a result of lower gas and NGL prices being realized on the volumes retained as a processing fee.

The following table provides the components of the Company's total production costs per BOE for 2013, 2012 and 2011:

	Year Ended December 31,
	2013		2012		2011
Lease operating expenses	$	8.00	$	7.91	$	7.59
Third-party transportation charges	1.56		1.31		1.14
Net natural gas plant/gathering charges	0.10		0.54		0.16
Workover costs	0.77		0.83		0.80
Total production costs	$	10.43	$	10.59	$	9.69

Production and ad valorem taxes. The Company recorded production and ad valorem taxes of $201.2 million during 2013, as compared to $178.7 million and $139.4 million for 2012 and 2011, respectively. In general, production taxes and ad valorem taxes are directly related to commodity price changes; however, Texas ad valorem taxes are based upon prior year commodity prices, whereas production taxes are based upon current year commodity prices. Production and ad valorem taxes on a per BOE basis have been relatively stable since 2011.

The following table provides the Company's production and ad valorem taxes per BOE from continuing operations and total production and ad valorem taxes per BOE from continuing operations for 2013, 2012 and 2011:

	Year Ended December 31,
	2013		2012		2011
Production taxes	$	2.20	$	2.17	$	2.23
Ad valorem taxes	1.22		1.22		1.17
Total ad valorem and production taxes	$	3.42	$	3.39	$	3.40

Depletion, depreciation and amortization expense. The Company's total DD&A expense from continuing operations was $907.1 million ($15.39 per BOE), $708.3 million ($13.44 per BOE), and $489.6 million ($11.96 per BOE) for 2013, 2012 and 2011, respectively. Depletion expense on oil and gas properties, the largest component of DD&A expense, was $14.70, $12.82 and $11.33 per BOE during 2013, 2012 and 2011, respectively.

During 2013, the 15 percent increase in per BOE depletion expense, as compared to that of 2012, is primarily due to (i) capital expenditures to develop proved undeveloped locations, primarily in the Company's successful Spraberry and Eagle Ford Shale fields programs and (ii) a 22 percent decline in total proved reserves. The decline in total proved reserves is primarily

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PIONEER NATURAL RESOURCES COMPANY

comprised of negative revisions of previous estimates to remove undeveloped vertical well locations that are no longer expected to be drilled as the Company shifts its planned capital expenditures to higher-rate-of-return horizontal drilling, partially offset by a nine percent increase in proved developed reserves.

During 2012, the 13 percent increase in per BOE depletion expense was primarily due to (i) increased drilling expenditures on proved undeveloped locations, primarily in the Spraberry field and (ii) declines in proved gas reserves due to lower first-day-of-the-month gas prices during the twelve month period ending on December 31, 2012, partially offset by (iii) the impairment effects of reducing carrying values of the South Texas Edwards Trend/Austin Chalk fields during 2012 and 2011, respectively (see the discussion below for more information on the Company's impairment charges).

Impairment of oil and gas properties and other long-lived assets. The Company recorded impairment expense in continuing operations to reduce the carrying values of oil and gas properties by $1.5 billion and $354.4 million during the years ended December 31, 2013 and 2011, respectively.

The Company performs assessments of its long-lived assets to be held and used, including oil and gas properties, whenever events or circumstances indicate that the carrying values of those assets may not be recoverable. In order to perform these assessments, management uses various observable and unobservable inputs, including management's outlooks for (i) commodity prices, (ii) production costs, (iii) capital expenditures and (iv) production, based upon current estimates of proved reserves and risk-adjusted probable reserves.

Management's commodity price outlooks represent longer-term outlooks that are developed based on third-party longer-term commodity futures price outlooks as of a measurement date ("Management's Price Outlooks"). During 2013, 2012 and 2011, declines in Management's Price Outlooks for gas provided indications of possible impairment of the Company's predominantly dry gas properties in the Raton field in southeastern Colorado, the Barnett Shale field in North Texas (classified as held for sale as of December 31, 2013) and the Edwards Trend and Austin Chalk fields in South Texas, respectively. During the years ended December 31, 2013 and 2012, Management's Price Outlook for gas declined by 10 percent and four percent, respectively, and Management's Price Outlook for oil declined by seven percent for both periods. The trend of Management's Price Outlooks by quarter during 2013 is as follows:

	December 31, 2013	September 30, 2013	June 30, 2013	March 31, 2013	December 31, 2012
Management's gas outlook	$4.43	$4.93	$5.43	$4.81	$4.92
Management's oil outlook	$80.40	$83.24	$80.65	$85.13	$86.40

As a result of management's assessments, during 2013, 2012 and 2011, the Company recognized noncash impairment charges of $1.5 billion, $532.6 million and $354.4 million to reduce the carrying values of the Company's Raton field assets, the Company's Barnett Shale field assets (which are now classified as discontinued operations in the accompanying statements of operations) and the Edwards Trend/Austin Chalk field assets, respectively, to their estimated fair values.

Declines in Management's Price Outlooks during 2013 also provided an indication that the Company's Hugoton field assets in southwest Kansas may have been impaired. The Company's estimates of undiscounted future net cash flows attributable to the Hugoton field assets indicated that on December 31, 2013 their carrying amounts are expected to be recovered, but continue to be at risk for impairment if estimates of future cash flows decline. For example, the Company estimates that the carrying value of the Hugoton field may become partially impaired if the average price in Management's Price Outlook for gas were to decline by approximately $0.30 to $0.50 per MCF. The Company estimates that if the Hugoton field were to become impaired in a future period, the Company would recognize noncash impairment charges in that period that could range from $200 million to $250 million.

It is reasonably possible that the estimate of undiscounted future net cash flows attributable to these or other properties may change in the future resulting in the need to impair their carrying values. The primary factors that may affect estimates of future cash flows are (i) future reserve adjustments, both positive and negative, to proved reserves and appropriate risk-adjusted probable and possible reserves (ii) results of future drilling activities, (iii) Management's Price Outlooks and (iv) increases or decreases in production and capital costs associated with these fields.

See Notes B and D of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for additional information about the Company's impairment assessments.

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PIONEER NATURAL RESOURCES COMPANY

Exploration and abandonments expense. The following table provides the Company's geological and geophysical costs, exploratory dry holes expense and leasehold abandonments and other exploration expense from continuing operations for 2013, 2012 and 2011 (in thousands):

	Year Ended December 31,
	2013		2012		2011
Geological and geophysical	$	77,005	$	66,908	$	48,092
Exploratory dry holes	5,876		9,016		2,864
Leasehold abandonments and other	15,567		22,361		29,735
	$	98,448	$	98,285	$	80,691

During 2013, the Company's exploration and abandonment expense was primarily attributable to $77.0 million of geological and geophysical costs, of which $58.0 million was geological and geophysical administrative costs; $5.9 million of dry hole provisions; and $15.5 million of leasehold abandonment expense, which included $14.3 million associated with the Company's unproved dry gas properties in the Eagle Ford Shale and other unproved property abandonments. During 2013, the Company completed and evaluated 253 exploration/extension wells, 244 of which were successfully completed as discoveries.

During 2012, the Company's exploration and abandonment expense was primarily attributable to $66.9 million of geological and geophysical costs, of which $42.0 million was geological and geophysical administrative costs; $9.0 million of dry hole provisions; and $22.2 million of leasehold abandonment expense. The significant components of the Company's 2012 leasehold abandonment expense included $9.5 million in the Eagle Ford Shale area, $4.8 million in the Rockies area and $4.7 million in the Permian Basin. During 2012, the Company completed and evaluated 229 exploration/extension wells, 223 of which were successfully completed as discoveries.

During 2011, the Company's exploration and abandonment expense was primarily attributable to $48.1 million of geological and geophysical costs, of which $32.0 million was geological and geophysical administrative costs, and $29.7 million of leasehold abandonment expense. The significant components of the Company's 2011 leasehold abandonment expense included dry gas unproved acreage abandonments of $9.3 million in the South Texas area and $9.1 million in the Rockies area. During 2011, the Company completed and evaluated 168 exploration/extension wells, 167 of which were successfully completed as discoveries.

General and administrative expense. General and administrative expense from continuing operations totaled $295.9 million, $244.2 million and $190.0 million during 2013, 2012 and 2011, respectively. The increase in 2013, as compared to 2012, is primarily due to increases of $42.7 million and $3.3 million in compensation and occupancy expenses, respectively, related to staffing increases in support of the Company's capital expansion and integrated services initiatives. The $42.7 million increase in compensation expense includes a $7.6 million increase in stock-based compensation expense associated with Liability Awards, primarily due to increases in the market value of the Company's common stock during 2013, and an $18.9 million increase in cash bonus expense payable to employees as a result of the accomplishments of the Company during 2013.

The increase in general and administrative expense during 2012, as compared to 2011, was also primarily due to increases of $45.7 million and $4.7 million in compensation and occupancy expenses, respectively, related to staffing increases in support of the Company's capital expansion and integrated services initiatives.

Accretion of discount on asset retirement obligations. Accretion of discount on asset retirement obligations from continuing operations was $11.9 million, $8.7 million and $7.5 million during 2013, 2012 and 2011, respectively. The 37 percent and 16 percent increases in accretion of discount on asset retirement obligations during 2013 and 2012, respectively, are primarily due to additional well completions resulting from the Company's drilling activities. See Note I of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for additional information regarding the Company's asset retirement obligations.

Interest expense. Interest expense was $183.8 million, $204.2 million and $181.6 million during 2013, 2012 and 2011, respectively. The weighted average interest rate on the Company's indebtedness for the year ended December 31, 2013 was 6.5 percent, as compared to 6.0 percent and 7.2 percent for the years ended December 31, 2012 and 2011, respectively.

The decrease in interest expense during 2013, as compared to 2012, was primarily due to a decrease in debt as a result of the repayment of amounts outstanding under Pioneer Southwest's credit facility and conversions of Convertible Senior Notes, and a decrease of $18.3 million in noncash amortization of financing fees, debt issuance discounts and deferred hedge losses.

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PIONEER NATURAL RESOURCES COMPANY

The $22.6 million increase in interest expense during 2012, as compared to 2011, is primarily due to an $868.9 million increase in the Company's average outstanding indebtedness, partially offset the 1.2 percent decline in weighted average interest on indebtedness.

See Note G of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for additional information about the Company's long-term debt and interest expense.

Other expenses. Other expenses from continuing operations were $137.4 million during 2013, as compared to $114.2 million during 2012 and $63.1 million during 2011. The $23.2 million increase in other expense during 2013, as compared to 2012, is primarily associated with (i) $25.5 million of impairment associated with the planned sale of the Company's majority interest in Sendero, (ii) a $30.6 million increase in inventory valuation allowances and (iii) an $8.8 million increase in contingency and environmental accrual adjustments, partially offset by (iv) a $23.4 million decrease in above market and idle drilling and well service equipment charges and (v) a $14.7 million decrease in terminated drilling rig contract charges.

The $51.1 million increase in other expense during 2012, as compared to 2011, is primarily due to $15.7 million of contract rig termination fees incurred during 2012, a $15.0 million increase in unused gas transportation commitment charges and a $13.0 million increase in above market and idle drilling and well service equipment charges, which are not chargeable to joint operations.

See Note N of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for additional information regarding the Company's other expenses.

Income tax provision. The Company recognized an income tax benefit attributable to earnings from continuing operations of $211.8 million during 2013, as compared to income tax provisions of $290.5 million and $188.3 million during 2012 and 2011, respectively. The Company's effective tax rates on earnings from continuing operations, excluding income from noncontrolling interest, for 2013, 2012 and 2011 were 35 percent, 37 percent and 34 percent, respectively, as compared to the combined United States federal and state statutory rates of approximately 36 percent.

See "Critical Accounting Estimates" below and Note O of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for additional information regarding the Company's income tax rates and attributes.

Income (loss) from discontinued operations, net of tax. The Company recognized a loss from discontinued operations, net of tax, of $449.6 million in 2013 as compared to a loss of $304.2 million for 2012 and income of $474.1 million for 2011. Income (loss) from discontinued operations, net of tax includes the operations of the following:

• Pioneer Alaska which was placed into assets held for sale and discontinued operation in December 2013,

• The Barnett Shale field assets which were placed into assets held for sale and discontinued operation in December 2013,

• Pioneer South Africa which was placed into assets held for sale and discontinued operation in December 2011; and

• Pioneer Tunisia which was placed into assets held for sale and discontinued operations in December 2010.

The $145.4 million increase in loss from discontinued operations, net of tax during 2013, as compared to 2012 is primarily attributable to the increase in impairments of net assets. In 2013, the Company had total impairments of Pioneer Alaska and Barnett Shale assets of $729.3 million, compared to impairment charges of $532.6 million on Barnett Shale assets in 2012. The $778.3 million decrease in income from discontinued operations, net of tax during 2012, as compared to 2011 is primarily attributable to the after tax gain on the sale of Pioneer Tunisia recorded in 2011 and the 2012 impairment of Barnett Shale field assets.

See Note C of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for additional information regarding the Company's discontinued operations.

Net income attributable to noncontrolling interest. Net income attributable to noncontrolling interests was $38.9 million, $50.5 million and $47.4 million for the years ended December 31, 2013, 2012 and 2011, respectively. The Company's net income attributable to noncontrolling interest is primarily associated with the net income of Pioneer Southwest that was allocated to limited partners, through December 17, 2013, the date of the Pioneer Southwest merger. The $11.6 million decrease in net income attributable to noncontrolling interest in 2013, as compared to 2012, is primarily due to decreases in Pioneer Southwest's noncash derivative gains, higher production costs and higher depletion expense, partially offset by increased revenues.

The $3.1 million increase in net income attributable to noncontrolling interest in 2012, as compared to 2011, is primarily due to a 10 percent increase in noncontrolling interest in Pioneer Southwest during November 2011 as a result of an offering by Pioneer Southwest of 4.4 million common units, representing limited partnership units, of which 1.8 million common units were

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sold by the Company. Partially offsetting the increase in noncontrolling interest in Pioneer Southwest was a $15.3 million decline in Pioneer Southwest's net income during 2012, as compared to 2011. See Note B of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for additional information regarding Pioneer Southwest and the Company's noncontrolling interest in consolidated subsidiaries' net income.

Capital Commitments, Capital Resources and Liquidity

Capital commitments. The Company's primary needs for cash are for capital expenditures and acquisition expenditures on oil and gas properties and related vertical integration assets and facilities, payments of contractual obligations, dividends and working capital obligations. Funding for these cash needs may be provided by any combination of internally-generated cash flow, cash and cash equivalents on hand, proceeds from the sale of nonstrategic assets or external financing sources as discussed in "Capital resources" below. During 2014, the Company expects that it will be able to fund its needs for cash (excluding acquisitions, if any) with a combination of internally generated cash flows, cash and cash equivalents on hand, proceeds from the divestiture of assets held for sale, proceeds from the sale of other nonstrategic assets and, if necessary, availability under the Company's credit facility. Although the Company expects that these sources of funding will be adequate to fund capital expenditures and dividend payments and provide adequate liquidity to fund other needs, no assurances can be given that such funding sources will be adequate to meet the Company's future needs.

During 2014, the Company plans to continue to focus its capital spending primarily on liquids-rich drilling activities. The Company's 2014 capital budget totals $3.3 billion (excluding acquisitions, asset retirement obligations, capitalized interest, geological and geophysical administrative costs and capital expenditures associated with Pioneer Alaska and Barnett Shale field assets prior to their sale), consisting of $3.0 billion for drilling operations and $285 million for buildings, vertical integration and other plant and equipment additions. Based on the Company's current Management Price Outlooks, Pioneer expects its net cash flows from operating activities, cash and cash equivalents on hand, proceeds from the divestiture of assets held for sale, proceeds from other nonstrategic assets sales and, if necessary, availability under the Company's credit facility to be sufficient to fund its planned capital expenditures and contractual obligations.

Investing activities. Net cash used in investing activities during 2013 was $2.1 billion, as compared to net cash used in investing activities of $3.3 billion and $1.6 billion during 2012 and 2011, respectively. The decrease in net cash flow used in investing activities during 2013, as compared to 2012, is primarily due to (i) a $615.5 million increase in proceeds from disposition of assets, which resulted from $623.8 million of net cash proceeds from the May 2013 sale to Sinochem of a 40 percent interest in the Company's horizontal Wolfcamp Shale play in the southern portion of the Spraberry field in West Texas, (ii) a $297.1 million decrease in payments for acquisitions due to the acquisition of Premier Silica during 2012, (iii) a $119.3 million decrease in additions to oil and gas properties, partially due to the drilling carry being paid by Sinochem in the southern portion of the horizontal Wolfcamp Shale play, (iv) a $59.7 million decrease in additions to other assets and other property and equipment and (v) a $25.1 million distribution from EFS Midstream during December 2013. In addition to the aforementioned proceeds from disposition of assets, the Company's investing activities during the year ended December 31, 2013 were funded by net cash provided by operating activities.

The increase in net cash flow used in investing activities during 2012, as compared to 2011, was primarily due to (i) an $831.1 million increase in additions to oil and gas properties associated with the Company's capital programs, (ii) a $723.5 million decrease in proceeds from disposition of assets (primarily attributable to the 2011 sale of Pioneer Tunisia, partially offset by proceeds from the sales of Pioneer South Africa and a partial interest in certain Eagle Ford Shale unproved leaseholds during 2012) and (iii) the $297.1 million of cash used for the acquisition of Premier Silica, partially offset by (iv) an $89.6 million decrease in investments in EFS Midstream and (v) a $66.4 million decrease in additions to other assets and other property and equipment. See "Results of Operations" above and Note C of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for additional information regarding asset divestitures.

Dividends/distributions. During each of the years ended December 31, 2013, 2012 and 2011, the Board declared semiannual dividends of $0.04 per common share. Associated therewith, the Company paid $11.1 million, $10.0 million and $9.6 million, respectively, of aggregate dividends. Future dividends are at the discretion of the Board, and, if declared, the Board may change the dividend amount based on the Company's liquidity and capital resources at the time.

During January, April, July and October of 2013, 2012 and 2011, the board of directors of the general partner of Pioneer Southwest declared quarterly distributions aggregating annually to $2.08, $2.07 and $2.03 per limited partner unit, respectively. Associated therewith, Pioneer Southwest paid aggregate distributions to noncontrolling unitholders of $35.3 million, $35.2 million and $25.6 million during the years ended December 31, 2013, 2012 and 2011, respectively.

Off-balance sheet arrangements. From time-to-time, the Company enters into off-balance sheet arrangements and transactions that can give rise to material off-balance sheet obligations of the Company. As of December 31, 2013, the material

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off-balance sheet arrangements and transactions that the Company has entered into include (i) operating lease agreements, (ii) drilling commitments (iii) firm transportation and fractionation commitments, (iv) open purchase commitments and (v) contractual obligations for which the ultimate settlement amounts are not fixed and determinable, such as derivative contracts that are sensitive to future changes in commodity prices or interest rates, gathering, treating, fractionation and transportation commitments on uncertain volumes of future throughput, open delivery commitments and indemnification obligations following certain divestitures. Other than the off-balance sheet arrangements described above, the Company has no transactions, arrangements or other relationships with unconsolidated entities or other persons that are reasonably likely to materially affect the Company's liquidity or availability of or requirements for capital resources. See "Contractual obligations" below and Note J of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for more information regarding the Company's off-balance sheet arrangements.

Contractual obligations. The Company's contractual obligations include long-term debt, operating leases, drilling commitments (including commitments to pay day rates for drilling rigs), capital funding obligations, derivative obligations, other liabilities (including postretirement benefit obligations), firm transportation and fractionation commitments and minimum annual gathering, treating and transportation commitments. Other joint owners in the properties operated by the Company will incur portions of the costs represented by these commitments.

The following table summarizes by period the payments due by the Company for contractual obligations estimated as of December 31, 2013:

	Payments Due by Year
	2014		2015 and 2016		2017 and 2018		Thereafter
	(in thousands)
Long-term debt (a)	$	—	$	455,385	$	934,600	$	1,300,000
Operating leases (b)	25,305		34,630		31,055		26,569
Drilling commitments (c)	189,987		172,846		—		—
Derivative obligations (d)	11,626		—		2,357		7,576
Open purchase commitments (e)	232,351		5,084		—		—
Other liabilities (f)	46,873		44,576		41,767		166,685
Firm gathering, processing and transportation commitments (g)	353,167		823,157		527,327		773,868
	$	859,309	$	1,535,678	$	1,537,106	$	2,274,698

 _____________________

(a) See "Item 7A. Quantitative and Qualitative Disclosures About Market Risk" for information regarding estimated future interest payment obligations under long-term debt obligations. The amounts included in the table above represent principal maturities only.

(b) See Note J of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for more information about the Company's operating leases.

(c) Drilling commitments represent future minimum expenditure commitments for drilling rig services and well commitments under contracts to which the Company was a party on December 31, 2013.

(d) Derivative obligations represent net liabilities determined in accordance with master netting arrangements for commodity and interest rate derivatives that were valued as of December 31, 2013. The ultimate settlement amounts of the Company's derivative obligations are unknown because they are subject to continuing market risk. See "Item 7A. Quantitative and Qualitative Disclosures About Market Risk" and Note E of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for additional information regarding the Company's derivative obligations.

(e) Open purchase commitments primarily represent expenditure commitments for inventory, materials and other property and equipment ordered, but not received, as of December 31, 2013.

(f) The Company's other liabilities represent current and noncurrent other liabilities that are comprised of postretirement benefit obligations, litigation and environmental contingencies, asset retirement obligations and other obligations for which neither the ultimate settlement amounts nor their timings can be precisely determined in advance. See Notes H, I and J of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for additional information regarding the Company's postretirement benefit obligations, asset retirement obligations and litigation and environmental contingencies, respectively.

(g) Gathering, processing and transportation commitments represent estimated fees on production throughput commitments and demand fees associated with volume delivery commitments of up to 50,000 BOEPD through August 2017 that are related to the Company's Permian Basin operations. The Company does not expect to be able to fulfill all of its short-term and long-term delivery obligations from projected production of available reserves; consequently, the Company plans to

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purchase third party volumes to satisfy its commitments if it is economic to do so; otherwise, it will pay demand fees for commitment shortfalls. See "Item 2. Properties" and Note J of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for additional information regarding the Company's gathering, processing and transportation commitments.

Capital resources. The Company's primary capital resources are cash and cash equivalents, net cash provided by operating activities, proceeds from sales of joint interests and nonstrategic assets and proceeds from financing activities (principally borrowings under the Company's credit facility or issuances of debt or equity securities). If internal cash flows and cash on hand do not meet the Company's expectations, the Company may reduce its level of capital expenditures, and/or fund a portion of its capital expenditures using availability under the Company's credit facility, issue debt or equity securities or obtain capital from other sources, such as through sales of nonstrategic assets.

Operating activities. Net cash provided by operating activities for the years ended December 31, 2013, 2012 and 2011 was $2.1 billion, $1.8 billion and $1.5 billion, respectively. The increase in net cash flow provided by operating activities in 2013 was primarily due to an increase in oil and gas sales, partially offset by a decrease in net cash receipts from derivative settlements. The increase in net cash flow provided by operating activities in 2012 was primarily due to increases in oil and gas sales and net cash receipts from derivative settlements.

Asset divestitures. During the fourth quarter of 2013, the Company committed to a plan to sell 100 percent of the capital stock in Pioneer Alaska.The sale of Pioneer Alaska continues to be subject to ongoing negotiations and certain other conditions, such as governmental approvals and buyer's arrangement of financing. Associated with the planned sale of Pioneer Alaska, the Company recorded a noncash impairment charge of $539.8 million in discontinued operations during December 2013 to reduce the carrying value of the Pioneer Alaska assets to their estimated fair value less costs to sell of $350.6 million. The Company has classified Pioneer Alaska assets and liabilities as held for sale in the accompanying consolidated balance sheet as of December 31, 2013 and has reported Pioneer Alaska's historical results of operations, and the related impairment loss, as discontinued operations, net of tax in the Company's accompanying consolidated statements of operations.

During the fourth quarter of 2013, the Company committed to a plan to divest of its net assets in the Barnett Shale field in North Texas. The plan is expected to result in the sale of the Barnett Shale net assets during 2014. The Company has classified Barnett Shale assets and liabilities as held for sale in the accompanying consolidated balance sheet as of December 31, 2013 and has reported Barnett Shale historical results of operations, and the related impairment loss, as discontinued operations, net of tax in the Company's accompanying consolidated statements of operations.

Associated with the plan to sell its net assets in the Barnett Shale field, the Company recorded a noncash impairment charge of $189.5 million in discontinued operations during December 2013 to reduce the carrying value of its net assets in the Barnett Shale field to their estimated fair value less costs to sell. See Note D for more information about the impairment of the Company's Barnett Shale field net assets. Also included in discontinued operations in 2013 is the sale of the Company's interest in certain proved and unproved oil and gas properties in the Barnett Shale field for net cash proceeds of $33.8 million, which resulted in a gain of $8.7 million on the unproved properties sold.

During December 2013, the Company committed to a plan to sell its majority interest in Sendero (the Company's vertical drilling rig subsidiary) to Sendero's minority interest owner for $31.0 million, subject to negotiating a definitive sales agreement and the buyer completing its financing arrangements. The Company classified these assets and liabilities as held for sale in the Company's accompanying consolidated balance sheet as of December 31, 2013.

The Company's plans to sell Pioneer Alaska, the Barnett Shale net assets and Sendero are in various stages of marketing or negotiation. No assurance can be given that the sales will be completed in accordance with the Company's plans.

In January 2013, the Company signed an agreement with Sinochem to sell 40 percent of Pioneer's interest in 207,000 net acres leased by the Company in the horizontal Wolfcamp Shale play in the southern portion of the Spraberry field for consideration of $1.8 billion. In May 2013, the Company completed the sale to Sinochem for net cash proceeds of $623.8 million, resulting in a gain of $181.3 million related to the unproved property interests conveyed to Sinochem. Sinochem is paying the remaining $1.2 billion of the transaction price by carrying 75 percent of Pioneer's portion of ongoing drilling and facilities costs attributable to the Company's joint operations with Sinochem in the horizontal Wolfcamp Shale play.

During the first quarter of 2012, the Company agreed to sell Pioneer South Africa to an unaffiliated third party for $60.0 million of cash proceeds before normal closing and other adjustments, and the buyer's assumption of certain liabilities of the Company's South Africa subsidiaries. In August 2012, the Company completed the sale of Pioneer South Africa for net cash proceeds of $15.9 million, including normal closing adjustments for cash revenues and costs and expenses from the effective date through the date of the sale, resulting in a gain of $28.6 million. During 2011, the Company completed the sale of Pioneer Tunisia

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to an unaffiliated party for cash proceeds of $802.5 million, excluding cash and cash equivalents sold, resulting in a gain of $645.2 million.

See Note C of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for more information regarding the Company's divestitures.

Financing activities. Net cash provided by financing activities during 2013 was $157.8 million, as compared to net cash provided by financing activities during 2012 and 2011 of $1.1 billion and $457.4 million, respectively. During 2013, the significant components of financing activities included $1.1 billion of net payments on long-term debt, the Company's completion of an offering of 10.35 million shares of its common stock in February 2013 at a per-share price, after underwriting and offering expenses, of $123.76 for a total of $1.3 billion of realized net proceeds and $47.2 million of dividend payments and distributions to noncontrolling interests. During 2012, the significant components of financing activities included $1.2 billion of net borrowings on long-term debt and $45.9 million of dividend payments and distributions to noncontrolling interests. During 2011, significant components of financing activities included $484.2 million of net proceeds received from the offering of 5.5 million shares of the Company's common stock and $123.0 million of net proceeds received from the sale of 4.4 million common units representing limited partner interests in Pioneer Southwest, partially offset by $98.3 million of net principal payments on long-term debt and $36.3 million of dividend payments and distributions to noncontrolling interests.

The following provides a description of the Company's significant financing activities during 2013, 2012 and 2011:

• During December 2012 and March 2013, respectively, the Company's stock price met the price threshold that caused the Convertible Senior Notes to be convertible during the six months ended June 30, 2013 at the option of the holders into a combination of cash and the Company's common stock based on a formula set forth in the indenture supplement pursuant to which the Convertible Senior Notes were issued. On April 15, 2013, the Company announced that it would exercise its option to redeem all Convertible Senior Notes that had not been converted by the holders before May 16, 2013. Holders of $479.1 million principal amount of the Convertible Senior Notes exercised their right to convert their Convertible Senior Notes into cash and shares of the Company's common stock. The Company paid the tendering holders $479.1 million of cash and issued to the tendering holders 4.4 million shares of the Company's common stock in accordance with the terms of the Convertible Senior Notes indenture agreement. On May 16, 2013, the Company paid $845 thousand in principal and interest to redeem all Convertible Senior Notes that remained outstanding.

• During February 2013, the Company completed the sale of 10.35 million shares of its common stock for $1.3 billion of net cash proceeds.

• During December 2012, the Company amended its credit facility with a syndicate of financial institutions to increase the aggregate loan commitments to $1.5 billion from $1.25 billion and extend its maturity to December 2017;

• During June 2012, the Company issued $600 million of 3.95% Senior Notes due 2022 and received proceeds, net of $8.5 million of offering discounts and costs, of $591.5 million;

• During December 2011, Pioneer Southwest completed the public offering of 4.4 million common units of Pioneer Southwest, representing limited partnership interests, at a per-unit price of $29.20, before offering costs. Of the 4.4 million common units, Pioneer sold 1.8 million of its Pioneer Southwest common unit holdings for net proceeds of $50.5 million and Pioneer Southwest issued 2.6 million new common units for net proceeds of $72.5 million, including offering costs. Pioneer Southwest used its net proceeds to reduce its credit facility borrowings; and

• During November 2011, the Company completed the sale of 5.5 million shares of its common stock for $484.2 million of net proceeds.

See Note G of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for additional information regarding the significant financing activities.

As the Company pursues its strategy, it may utilize various financing sources, including fixed and floating rate debt, convertible securities, preferred stock or common stock. The Company cannot predict the timing or ultimate outcome of any such actions as they are subject to market conditions, among other factors. The Company may also issue securities in exchange for oil and gas properties, stock or other interests in other oil and gas companies or related assets. Additional securities may be of a class preferred to common stock with respect to such matters as dividends and liquidation rights and may also have other rights and preferences as determined by the Board.

Liquidity. The Company's principal sources of short-term liquidity are cash and cash equivalents and unused borrowing capacity under the Company's credit facility. As of December 31, 2013, the Company had no outstanding borrowings under the credit facility, leaving $1.5 billion of unused borrowing capacity. The Company was in compliance with all of its debt covenants. The Company's credit facility contains certain financial covenants, which include the maintenance of a ratio of total debt to book capitalization, subject to certain adjustments, not to exceed .60 to 1.0, which is above the Company's December 31, 2013 ratio of .24 to 1.0. If internal cash flows and cash on hand do not meet the Company's expectations, the Company may reduce its level

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PIONEER NATURAL RESOURCES COMPANY

of capital expenditures, reduce dividend payments, and/or fund a portion of its capital expenditures using borrowings under the Company's credit facility, issuances of debt or equity securities or other sources, such as sales of joint interests or nonstrategic assets. The Company cannot provide any assurance that needed short-term or long-term liquidity will be available on acceptable terms or at all. Although the Company expects that the combination of internal operating cash flows, cash and cash equivalents on hand, proceeds from the divestiture of assets held for sale, proceeds from the sales of other nonstrategic assets and, if necessary, available capacity under the Company's credit facility will be adequate to fund 2014 capital expenditures and dividend payments and provide adequate liquidity to fund other needs, no assurances can be given that such funding sources will be adequate to meet the Company's future needs.

Debt ratings. The Company is rated as investment grade by three credit rating agencies. The Company receives debt credit ratings from several of the major ratings agencies, which are subject to regular reviews. The Company believes that each of the rating agencies considers many factors in determining the Company's ratings, including: production growth opportunities, liquidity, debt levels, asset composition and proved reserve mix. A reduction in the Company's debt ratings could increase the interest rates that the Company incurs on credit facility borrowings and could negatively affect the Company's ability to obtain additional financing or the interest rate, fees and other terms associated with such additional financing.

Book capitalization and current ratio. The Company's net book capitalization at December 31, 2013 was $8.9 billion, consisting of $392.6 million of cash and cash equivalents, debt of $2.7 billion and stockholders' equity of $6.6 billion. The Company's debt to book capitalization decreased to 25 percent at December 31, 2013 from 37 percent at December 31, 2012, primarily due to an increase in cash and cash equivalents of $163.3 million and a decrease in long-term debt of $1.1 billion, partially offset by a net loss of $799.5 million during 2013. The Company's ratio of current assets to current liabilities increased to 1.38 to 1.00 at December 31, 2013, as compared to 1.02 to 1.00 at December 31, 2012, primarily due to the reclassification of long-term assets to assets held for sale.

Critical Accounting Estimates

The Company prepares its consolidated financial statements for inclusion in this Report in accordance with GAAP. See Note B of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for a comprehensive discussion of the Company's significant accounting policies. GAAP represents a comprehensive set of accounting and disclosure rules and requirements, the application of which requires management judgments and estimates including, in certain circumstances, choices between acceptable GAAP alternatives. The following is a discussion of the Company's most critical accounting estimates, judgments and uncertainties that are inherent in the Company's application of GAAP.

Asset retirement obligations. The Company has significant obligations to remove tangible equipment and facilities and to restore the land at the end of oil and gas production operations. The Company's removal and restoration obligations are primarily associated with plugging and abandoning wells. Estimating the future restoration and removal costs is difficult and requires management to make estimates and judgments because most of the removal obligations are many years in the future and contracts and regulations often have vague descriptions of what constitutes removal. Asset removal technologies and costs are constantly changing, as are regulatory, political, environmental, safety and public relations considerations.

Inherent in the present value calculation are numerous assumptions and judgments including the ultimate settlement amounts, credit adjusted discount rates, timing of settlement and changes in the legal, regulatory, environmental and political environments. To the extent future revisions to these assumptions impact the present value of the existing asset retirement obligations, a corresponding adjustment is generally made to the oil and gas property balance. See Notes B and I of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for additional information regarding the Company's asset retirement obligations.

Successful efforts method of accounting. The Company utilizes the successful efforts method of accounting for oil and gas producing activities as opposed to the alternate acceptable full cost method. In general, the Company believes that net assets and net income are more conservatively measured under the successful efforts method of accounting for oil and gas producing activities than under the full cost method, particularly during periods of active exploration. The critical difference between the successful efforts method of accounting and the full cost method is as follows: under the successful efforts method, exploratory dry holes and geological and geophysical exploration costs are charged against earnings during the periods in which they occur; whereas, under the full cost method of accounting, such costs and expenses are capitalized as assets, pooled with the costs of successful wells and charged against the earnings of future periods as a component of depletion expense. During 2013, 2012 and 2011, the Company recognized exploration, abandonment, geological and geophysical expense from continuing operations of $98.4 million, $98.3 million and $80.7 million, respectively. During 2013, 2012 and 2011, the Company recognized exploration, abandonment, geological and geophysical expense from discontinued operations of $52.7 million, $108.1 million and $44.9 million, respectively, under the successful efforts method.

Proved reserve estimates. Estimates of the Company's proved reserves included in this Report are prepared in accordance with GAAP and SEC guidelines. The accuracy of a reserve estimate is a function of:

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PIONEER NATURAL RESOURCES COMPANY

• the quality and quantity of available data;

• the interpretation of that data;

• the accuracy of various mandated economic assumptions; and

• the judgment of the persons preparing the estimate.

The Company's proved reserve information included in this Report as of December 31, 2013, 2012 and 2011 was prepared by the Company's engineers and audited by independent petroleum engineers with respect to the Company's major properties. Estimates prepared by third parties may be higher or lower than those included herein.

Because these estimates depend on many assumptions, all of which may substantially differ from future actual results, proved reserve estimates will be different from the quantities of oil and gas that are ultimately recovered. In addition, results of drilling, testing and production after the date of an estimate may justify, positively or negatively, material revisions to the estimate of proved reserves.

It should not be assumed that the Standardized Measure included in this Report as of December 31, 2013 is the current market value of the Company's estimated proved reserves. In accordance with SEC requirements, the Company based the 2013 Standardized Measure on a twelve month average of commodity prices on the first day of the month and prevailing costs on the date of the estimate. Actual future prices and costs may be materially higher or lower than the prices and costs utilized in the estimate. See "Item 1A. Risk Factors," "Item 2. Properties" and Supplementary Information included in "Item 8. Financial Statements and Supplementary Data" for additional information regarding estimates of proved reserves.

The Company's estimates of proved reserves materially impact depletion expense. If the estimates of proved reserves decline, the rate at which the Company records depletion expense will increase, reducing future net income. Such a decline may result from lower commodity prices, which may make it uneconomical to drill for and produce higher cost fields. In addition, a decline in proved reserve estimates may impact the outcome of the Company's assessment of its proved properties and goodwill for impairment.

Impairment of proved oil and gas properties. The Company reviews its proved properties to be held and used whenever management determines that events or circumstances indicate that the recorded carrying value of the properties may not be recoverable. Management assesses whether or not an impairment provision is necessary based upon estimated future recoverable proved and risk-adjusted probable and possible reserves, Management's Price Outlooks, production and capital costs expected to be incurred to recover the reserves; discount rates commensurate with the nature of the properties and net cash flows that may be generated by the properties. Proved oil and gas properties are reviewed for impairment at the level at which depletion of proved properties is calculated. See Notes B and D of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for information regarding the Company's impairment assessments.

Impairment of unproved oil and gas properties. At December 31, 2013, the Company carried unproved property costs of $123.4 million. Management assesses unproved oil and gas properties for impairment on a project-by-project basis. Management's impairment assessments include evaluating the results of exploration activities, Management's Price Outlooks and planned future sales or expiration of all or a portion of such projects.

Suspended wells. The Company suspends the costs of exploratory wells that discover hydrocarbons pending a final determination of the commercial potential of the discovery. The ultimate disposition of these well costs is dependent on the results of future drilling activity and development decisions. If the Company decides not to pursue additional appraisal activities or development of these fields, the costs of these wells will be charged to exploration and abandonment expense.

The Company does not carry the costs of drilling an exploratory well as an asset in its consolidated balance sheets following the completion of drilling unless both of the following conditions are met:

(i) The well has found a sufficient quantity of reserves to justify its completion as a producing well.

(ii) The Company is making sufficient progress assessing the reserves and the economic and operating viability of the project.

Due to the capital intensive nature and the geographical location of certain projects, it may take an extended period of time to evaluate the future potential of an exploration project and economics associated with making a determination on its commercial viability. In these instances, the project's feasibility is not contingent upon price improvements or advances in technology, but rather the Company's ongoing efforts and expenditures related to accurately predicting the hydrocarbon recoverability based on well information, gaining access to other companies' production, transportation or processing facilities and/or getting partner approval to drill additional appraisal wells. These activities are ongoing and being pursued constantly. Consequently, the Company's assessment of suspended exploratory well costs is continuous until a decision can be made that the well has found proved reserves to sanction the project or is noncommercial and is impaired. See Note F of Notes to Consolidated Financial Statements included

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in "Item 8. Financial Statements and Supplementary Data" for additional information regarding the Company's suspended exploratory well costs.

Deferred tax asset valuation allowances. The Company continually assesses both positive and negative evidence to determine whether it is more likely than not that its deferred tax assets, if any, will be realized prior to their expiration. Pioneer monitors Company-specific, oil and gas industry and worldwide economic factors and reassesses the likelihood that the Company's net operating loss carryforwards and other deferred tax attributes in each jurisdiction will be utilized prior to their expiration. There can be no assurance that facts and circumstances will not materially change and require the Company to establish deferred tax asset valuation allowances in certain jurisdictions in a future period.

Goodwill impairment. The Company reviews its goodwill for impairment at least annually. During the third and fourth quarters of 2013, the Company performed qualitative assessments of goodwill to assess whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount as a basis for determining whether it is necessary to perform the two-step goodwill impairment test. The Company determined that it was not likely that the Company's goodwill was impaired.

For assessments prior to 2012, the Company was required to estimate the fair value of the assets and liabilities of the reporting units that have goodwill. There is considerable judgment involved in estimating fair values, particularly in determining the valuation methodologies to utilize, the estimation of proved reserves as described above and the weighting of different valuation methodologies applied. See Note B of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for additional information regarding goodwill and assessments of goodwill for impairment.

Litigation and environmental contingencies. The Company makes judgments and estimates in recording liabilities for ongoing litigation and environmental remediation. Actual costs can vary from such estimates for a variety of reasons. The costs to settle litigation can vary from estimates based on differing interpretations of laws and opinions and assessments on the amount of damages. Similarly, environmental remediation liabilities are subject to change because of changes in laws and regulations, developing information relating to the extent and nature of site contamination and improvements in technology. A liability is recorded for these types of contingencies if the Company determines the loss to be both probable and reasonably estimable. See Note J of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for additional information regarding the Company's commitments and contingencies.

Valuation of stock-based compensation. The Company calculates the fair value of stock-based compensation using various valuation methods. The valuation methods require the use of estimates to derive the inputs necessary to determine fair value. The Company utilizes (a) the Black-Scholes option pricing model to measure the fair value of stock options, (b) the closing stock price on the day prior to the date of grant for the fair value of restricted stock awards, (c) the closing stock price at the balance sheet date for restricted stock awards that are expected to be settled wholly or partially in cash on their vesting date, (d) the Monte Carlo simulation method for the fair value of performance unit awards and (e) a probability forecasted fair value method for Series B unit awards issued by Sendero. See Note H of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for information regarding the Company's stock-based compensation.

Valuation of other assets and liabilities at fair value. The Company periodically measures and records certain assets and liabilities at fair value. The assets and liabilities that the Company periodically measures and records at fair value include trading securities, commodity derivative contracts and interest rate contracts. The Company also measures and discloses certain financial assets and liabilities at fair value, such as long-term debt. The valuation methods used by the Company to measure the fair values of these assets and liabilities require considerable management judgment and estimates to derive the inputs necessary to determine fair value estimates, such as future prices, credit-adjusted risk-free rates and current volatility factors. See Note D of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for information regarding the methods used by management to estimate the fair values of these assets and liabilities.

New Accounting Pronouncements

The effects of new accounting pronouncements are discussed in Note B of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data."

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PIONEER NATURAL RESOURCES COMPANY

ITEM 7A. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

The following quantitative and qualitative information is provided about financial instruments to which the Company was a party as of December 31, 2013, and from which the Company may incur future gains or losses from changes in commodity prices or interest rates.

The fair values of the Company's long-term debt and derivative contracts are determined based on observable inputs and utilizing the Company's valuation models and applications. As of December 31, 2013, the Company was a party to commodity swap contracts, interest rate swap contracts, commodity collar contracts and commodity collar contracts with short put options. See Notes D and E of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for additional information regarding the Company's fair value measurements and derivative contracts. The following table reconciles the changes that occurred in the fair values of the Company's open derivative contracts during 2013:

	Derivative Contract Net Assets (Liabilities)
	Commodities			Interest Rate			Total
	(in thousands)
Fair value of contracts outstanding as of December 31, 2012	$	318,377		$	(9,724	)	$	308,653
Changes in contract fair values (a)	(5,793		)	9,803			4,010
Contract maturities	(167,164		)	—			(167,164		)
Contract terminations	(485		)	(482		)	(967		)
Fair value of contracts outstanding as of December 31, 2013	$	144,935		$	(403	)	$	144,532

 _____________________

(a) At inception, new derivative contracts entered into by the Company generally have no intrinsic value.

Quantitative Disclosures

Interest rate sensitivity. See Note G of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" and Capital Commitments, Capital Resources and Liquidity included in "Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations" for information regarding the Company's outstanding debt and debt transactions.

The following table provides information about financial instruments to which the Company was a party as of December 31, 2013 and that are sensitive to changes in interest rates. The table presents debt maturities by expected maturity dates, the weighted average interest rates expected to be paid on the debt given current contractual terms and market conditions, and the aggregate estimated fair value of the Company's outstanding debt. For fixed rate debt, the weighted average interest rates represent the contractual fixed rates that the Company was obligated to periodically pay on the debt as of December 31, 2013. The Company had no outstanding variable rate debt as of December 31, 2013, but presents for the readers' information the average variable contractual rates for its credit facility projected forward proportionate to the forward yield curve for LIBOR on February 20, 2014.

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PIONEER NATURAL RESOURCES COMPANY

INTEREST RATE SENSITIVITY

DEBT OBLIGATIONS AND DERIVATIVE FINANCIAL INSTRUMENTS AS OF DECEMBER 31, 2013

	Year Ending December 31,							Liability Fair Value at December 31,
	2014	2015	2016	2017	2018	Thereafter	Total	2013
Total Debt:	(in thousands, except percentages)
Fixed rate principal maturities (a)	$—	$—	$455,385	$485,100	$449,500	$1,300,000	$2,689,985	$	3,018,830
Weighted average fixed interest rate	6.15%	6.15%	6.17%	6.11%	5.91%	5.81%
Weighted average variable interest rate	1.77%	2.19%	3.15%	4.17%	—%	—%
Interest Rate Swaps:
Notional debt amount	$400,000	$400,000	$400,000	$400,000	$400,000	$354,167		$	403
Fixed rate payable (%)	3.95%	3.95%	3.95%	3.95%	3.95%	3.95%
Variable rate receivable (%)	1.39%	1.80%	2.76%	3.79%	4.60%	5.60%

 _______________________

(a) Represents maturities of principal amounts excluding debt issuance discounts and net deferred fair value hedge losses.

Commodity derivative instruments and price sensitivity. The following table provides information about the Company's oil, NGL and gas derivative financial instruments that were sensitive to changes in commodity prices as of December 31, 2013. Although the cash flow effects are mitigated by the Company's derivative instruments, declines in oil, NGL and gas prices reduce the Company's sales revenues.

The Company manages commodity price risk with derivative contracts, such as swaps, collar contracts and collar contracts with short put options. Swap contracts provide a fixed price for a notional amount of sales volumes. Collar contracts provide minimum ("floor" or "long put") and maximum ("ceiling" or "short call") prices on a notional amount of sales volumes, thereby allowing some price participation if the relevant index price closes above the floor price. Collar contracts with short put options differ from other collar contracts by virtue of the short put option price, below which the Company's realized price will exceed the variable market prices by the floor-to-short put price differential.

See Notes B, D and E of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for a description of the accounting procedures followed by the Company relative to its derivative financial instruments and for specific information regarding the terms of the Company's derivative financial instruments that are sensitive to changes in oil, NGL or gas prices.

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PIONEER NATURAL RESOURCES COMPANY

DERIVATIVE FINANCIAL INSTRUMENTS AS OF DECEMBER 31, 2013

	Year Ending December 31,								Asset (Liability) Fair Value at December 31,
	2014			2015			2016		2013 (a)
									(in thousands)
Oil Derivatives: (b)
Average daily notional BBL volumes:
Swap contracts	10,000			—			—		$	(6,283	)
Weighted average fixed price per BBL	$	93.87		$	—		$	—
Collar contracts with short puts	69,000			85,000			25,000		$	136,697
Weighted average ceiling price per BBL	$	114.05		$	98.98		$	93.30
Weighted average floor price per BBL	$	93.70		$	88.06		$	85.00
Weighted average short put price per BBL	$	77.61		$	73.06		$	70.00
Average forward NYMEX oil prices (c)	$	99.28		$	90.13		$	84.10
NGL Derivatives: (d)
Average daily notional BBL volumes:
Collar contracts with short puts (e)	1,000			—			—		$	1,010
Weighted average ceiling price per BBL	$	109.50		$	—		$	—
Weighted average floor price per BBL	$	95.00		$	—		$	—
Weighted average short put price per BBL	$	80.00		$	—		$	—
Average forward NGL prices (f)	$	86.99		$	—		$	—
Collar contracts (g)	3,000			—			—		$	270
Weighted average ceiling price per BBL	$	13.72		$	—		$	—
Weighted average floor price per BBL	$	10.78		$	—		$	—
Average forward NGL prices (f)	$	13.31		$	—		$	—
Gas Derivatives:
Average daily notional MMBTU volumes:
Swap contracts	195,000			20,000			—		$	(9,105	)
Weighted average fixed price per MMBTU	$	4.04		$	4.31		$	—
Collar contracts with short puts	115,000			285,000			20,000		$	18,098
Weighted average ceiling price per MMBTU	$	4.70		$	5.07		$	5.36
Weighted average floor price per MMBTU	$	4.00		$	4.00		$	4.00
Weighted average short put price per MMBTU	$	3.00		$	3.00		$	3.00
Average forward NYMEX gas prices (h)	$	4.85		$	4.22		$	4.10
Basis swap contracts (i)	85,082			30,000			—		$	4,248
Weighted average fixed price per MMBTU	$	(0.20	)	$	(0.18	)	$	—
Average forward basis differential prices (j)	$	(0.22	)	$	(0.32	)	$	—

 _____________________

(a) In accordance with Financial Accounting Standards Board Accounting Standards Codification ("ASC") 210-20 and ASC 815-10, the Company classifies the fair value amounts of derivative assets and liabilities executed under master netting arrangements as net derivative assets or net derivative liabilities, as the case may be. The net asset and liability amounts shown above have been provided on a commodity contract-type basis, which may differ from their master netting arrangements classifications.

(b) Subsequent to December 31, 2013, the Company entered into rollfactor swap contracts for 5,000 BBLs per day of the Company's March through December 2014 production with a NYMEX roll price of $0.82 per BBL and 5,000 BBLs per day of the Company's 2015 production with a NYMEX roll price of $0.60 per BBL. Rollfactor swap contracts fix the difference between (i) each day's price per BBL of WTI for the first nearby month less (ii) the price per BBL of WTI for the second nearby NYMEX month, multiplied by .6667; plus (iii) each day's price per BBL of WTI for the first nearby month less (iv) the price per BBL of WTI for the third nearby NYMEX month, multiplied by .3333.

(c) The average forward NYMEX oil prices are based on February 20, 2014 market quotes.

65

PIONEER NATURAL RESOURCES COMPANY

(d) Subsequent to December 31, 2013, the Company entered into propane swap contracts for 1,000 BBLs per day of March through December 2014 production with a price of $47.57 per BBL and 2,000 BBLs per day of April through October 2014 production with a price of $48.51 per BBL.

(e) Represent collar contracts with short puts that reduce the price volatility of natural gasoline forecasted for sale by the Company at Mont Belvieu, Texas-posted prices.

(f) Forward component NGL prices are derived from respective active-market NGL component price quotes on February 20, 2014.

(g) Represent collar contracts that reduce the price volatility of ethane forecasted for sale by the Company at Mont Belvieu, Texas-posted prices.

(h) The average forward NYMEX gas prices are based on February 20, 2014 market quotes.

(i) Subsequent to December 31, 2013, the Company entered into additional basis swap contracts for 35,000 MMBTU per day of April through December 2014 production with a negative price differential of $0.27 per MMBTU between the relevant index price and the NYMEX price.

(j) The average forward basis differential prices are based on February 20, 2014 market quotes for basis differentials between the relevant index prices and NYMEX-quoted forward prices.

Marketing and basis transfer derivatives. The Company enters into buy and sell marketing arrangements to fulfill firm pipeline transportation commitments. Associated with these marketing arrangements, the Company may enter into index swaps to mitigate price risk. As of December 31, 2013, the Company had no open marketing derivative positions. Subsequent to December 31, 2013, the Company entered into marketing gas index swap contracts for 20,000 MMBTU per day of March 2014 volumes with a price differential of $0.34 per MMBTU, 10,000 MMBTU per day of April through October 2014 volumes with a price differential of $0.36 per MMBTU and 30,000 MMBTU per day of April through December 2014 volumes with a price differential of $0.30 per MMBTU.

Qualitative Disclosures

The Company's primary market risk exposures are to changes in commodity prices and interest rates. These risks did not change materially from December 31, 2012 to December 31, 2013.

Non-derivative financial instruments. The Company is a borrower under fixed rate debt instruments and, from time to time, under a variable rate debt instrument that gives rise to interest rate risk. The Company's objective in borrowing under fixed or variable rate debt is to satisfy capital requirements while minimizing the Company's costs of capital. The Company also enters into oil and gas purchase and sale transactions with third parties to satisfy unused pipeline capacity commitments and to diversify a portion of the Company's WTI oil sales to a Gulf Coast oil price. See Note G of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for a discussion of the Company's debt instruments.

Derivative financial instruments. The Company, from time to time, utilizes commodity price and interest rate derivative contracts to mitigate commodity price and interest rate risks in accordance with policies and guidelines approved by the Board. In accordance with those policies and guidelines, the Company's executive management determines the appropriate timing and extent of derivative transactions.

66

ITEM 8. FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

Index to Consolidated Financial Statements

	Page
Consolidated Financial Statements of Pioneer Natural Resources Company:
Report of Independent Registered Public Accounting Firm	68
Consolidated Balance Sheets as of December 31, 2013 and 2012	69
Consolidated Statements of Operations for the Years Ended December 31, 2013, 2012 and 2011	71
Consolidated Statements of Comprehensive Income (Loss) for the Years Ended December 31, 2013, 2012 and 2011	72
Consolidated Statements of Equity for the Years Ended December 31, 2013, 2012 and 2011	73
Consolidated Statements of Cash Flows for the Years Ended December 31, 2013, 2012 and 2011	75
Notes to Consolidated Financial Statements	76
Unaudited Supplementary Information	114

67

REPORT OF INDEPENDENT REGISTERED PUBLIC

ACCOUNTING FIRM

The Board of Directors and Stockholders of

Pioneer Natural Resources Company

We have audited the accompanying consolidated balance sheets of Pioneer Natural Resources Company (the "Company") as of December 31, 2013 and 2012, and the related consolidated statements of operations, comprehensive income (loss), equity and cash flows for each of the three years in the period ended December 31, 2013. These financial statements are the responsibility of the Company's management. Our responsibility is to express an opinion on these financial statements based on our audits.

We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements. An audit also includes assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.

In our opinion, the financial statements referred to above present fairly, in all material respects, the consolidated financial position of Pioneer Natural Resources Company at December 31, 2013 and 2012, and the consolidated results of its operations and its cash flows for each of the three years in the period ended December 31, 2013, in conformity with U.S. generally accepted accounting principles.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), Pioneer Natural Resources Company's internal control over financial reporting as of December 31, 2013, based on criteria established in Internal Control — Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (1992 framework) and our report dated February 26, 2014 expressed an unqualified opinion thereon.

/s/ Ernst & Young LLP

Dallas, Texas

February 26, 2014

68

PIONEER NATURAL RESOURCES COMPANY

CONSOLIDATED BALANCE SHEETS

(in thousands)

	December 31,
	2013			2012
ASSETS
Current assets:
Cash and cash equivalents	$	392,646		$	229,396
Accounts receivable:
Trade, net	430,732			316,854
Due from affiliates	2,753			3,299
Income taxes receivable	4,784			7,447
Inventories	220,125			197,056
Prepaid expenses	15,852			13,438
Assets held for sale	583,750			—
Other current assets:
Derivatives	75,237			279,119
Other	2,555			3,746
Total current assets	1,728,434			1,050,355
Property, plant and equipment, at cost:
Oil and gas properties, using the successful efforts method of accounting:
Proved properties	13,406,135			14,259,708
Unproved properties	123,382			231,555
Accumulated depletion, depreciation and amortization	(4,903,122		)	(4,412,913		)
Total property, plant and equipment	8,626,395			10,078,350
Goodwill	274,329			298,142
Other property and equipment, net	1,224,153			1,217,694
Other assets:
Investment in unconsolidated affiliate	224,850			204,129
Derivatives	90,854			55,257
Other, net	123,773			165,103
	$	12,292,788		$	13,069,030

The accompanying notes are an integral part of these consolidated financial statements.

69

PIONEER NATURAL RESOURCES COMPANY

CONSOLIDATED BALANCE SHEETS (Continued)

(in thousands, except share data)

	December 31,
	2013			2012
LIABILITIES AND EQUITY
Current liabilities:
Accounts payable:
Trade	$	910,393		$	729,942
Due to affiliates	150,164			96,935
Interest payable	62,374			68,083
Income taxes payable	165			208
Deferred income taxes	19,169			86,481
Liabilities held for sale	38,562			—
Other current liabilities:
Derivatives	11,626			13,416
Other	57,653			39,725
Total current liabilities	1,250,106			1,034,790
Long-term debt	2,653,059			3,721,193
Derivatives	9,933			12,307
Deferred income taxes	1,472,717			2,140,416
Other liabilities	292,215			293,016
Equity:
Common stock, $.01 par value; 500,000,000 shares authorized; 145,833,707 and 134,966,740 shares issued at December 31, 2013 and 2012, respectively	1,458			1,350
Additional paid-in capital	5,079,821			3,683,934
Treasury stock, at cost: 3,206,054 and 11,611,093 shares at December 31, 2013 and 2012, respectively	(144,776		)	(510,570		)
Retained earnings	1,665,081			2,514,640
Total equity attributable to common stockholders	6,601,584			5,689,354
Noncontrolling interest in consolidating subsidiaries	13,174			177,954
Total equity	6,614,758			5,867,308
Commitments and contingencies
	$	12,292,788		$	13,069,030

The accompanying notes are an integral part of these consolidated financial statements.

70

PIONEER NATURAL RESOURCES COMPANY

CONSOLIDATED STATEMENTS OF OPERATIONS

(in thousands, except per share data)

	Year Ended December 31,
	2013			2012			2011
Revenues and other income:
Oil and gas	$	3,155,696		$	2,575,311		$	2,080,215
Sales of purchased oil and gas	333,822			122,093			14,542
Interest and other	16,961			(1,032		)	29,382
Derivative gains, net	4,010			330,251			392,752
Gain (loss) on disposition of assets, net	209,021			45,898			(3,644		)
	3,719,510			3,072,521			2,513,247
Costs and expenses:
Oil and gas production	614,676			558,045			396,961
Production and ad valorem taxes	201,186			178,723			139,425
Depletion, depreciation and amortization	907,077			708,270			489,579
Purchased oil and gas	335,734			120,408			13,949
Impairment of oil and gas properties	1,495,242			—			354,408
Exploration and abandonments	98,448			98,285			80,691
General and administrative	295,868			244,196			189,985
Accretion of discount on asset retirement obligations	11,862			8,677			7,506
Interest	183,750			204,222			181,604
Other	137,386			114,175			63,071
	4,281,229			2,235,001			1,917,179
Income (loss) from continuing operations before income taxes	(561,719		)	837,520			596,068
Income tax benefit (provision)	211,775			(290,488		)	(188,278		)
Income (loss) from continuing operations	(349,944		)	547,032			407,790
Income (loss) from discontinued operations, net of tax	(449,605		)	(304,210		)	474,124
Net income (loss)	(799,549		)	242,822			881,914
Net income attributable to noncontrolling interests	(38,865		)	(50,537		)	(47,425		)
Net income (loss) attributable to common stockholders	$	(838,414	)	$	192,285		$	834,489
Basic earnings per share attributable to common stockholders:
Income (loss) from continuing operations	$	(2.86	)	$	4.02		$	3.03
Income (loss) from discontinued operations	(3.30		)	(2.48		)	3.98
Net income (loss)	$	(6.16	)	$	1.54		$	7.01
Diluted earnings per share attributable to common stockholders:
Income (loss) from continuing operations	$	(2.86	)	$	3.91		$	2.97
Income (loss) from discontinued operations	(3.30		)	(2.41		)	3.91
Net income (loss)	$	(6.16	)	$	1.50		$	6.88
Weighted average shares outstanding:
Basic	136,130			122,966			116,904
Diluted	136,130			126,320			119,215
Amounts attributable to common stockholders:
Income (loss) from continuing operations	$	(388,809	)	$	496,495		$	360,365
Income (loss) from discontinued operations, net of tax	(449,605		)	(304,210		)	474,124
Net income (loss)	$	(838,414	)	$	192,285		$	834,489

The accompanying notes are an integral part of these consolidated financial statements.

71

PIONEER NATURAL RESOURCES COMPANY

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)

(in thousands)

	Year Ended December 31,
	2013			2012			2011
Net income (loss)	$	(799,549	)	$	242,822		$	881,914
Other comprehensive activity:
Net hedge (gains) losses included in continuing operations	—			4,855			(32,636		)
Income tax (benefit) provision	—			(1,725		)	8,407
Other comprehensive activity	—			3,130			(24,229		)
Comprehensive income (loss)	(799,549		)	245,952			857,685
Comprehensive income attributable to the noncontrolling interests	(38,865		)	(50,537		)	(33,687		)
Comprehensive income (loss) attributable to common stockholders	$	(838,414	)	$	195,415		$	823,998

The accompanying notes are an integral part of these consolidated financial statements.

72

PIONEER NATURAL RESOURCES COMPANY

CONSOLIDATED STATEMENTS OF EQUITY

(in thousands, except dividends per share)

			Equity Attributable to Common Stockholders
	Shares Outstanding		Common Stock		Additional Paid-in Capital			Treasury Stock			Retained Earnings			Accumulated Other Comprehensive Income (Loss)			Noncontrolling Interests			Total Equity
Balance as of December 31, 2010	115,309		$	1,262	$	3,022,768		$	(421,235	)	$	1,510,427		$	7,361		$	105,442		$	4,226,025
Issuance of common stock	5,500		55		484,105			—			—			—			—			484,160
Sale of Pioneer Southwest common units, net of tax	—		—		26,915			—			—			—			8,176			35,091
Issuance of Pioneer Southwest common units, net of tax	—		—		8,104			—			—			—			40,688			48,792
Dividends declared ($0.08 per share)	—		—		—			—			(9,498		)	—			—			(9,498		)
Exercise of long-term incentive plan stock options and employee stock purchases	76		—		951			3,097			(352		)	—			—			3,696
Purchase of treasury stock	(439	)	—		—			(40,157		)	—			—			(198		)	(40,355		)
Conversion of 2.875% convertible senior notes	—		—		(20		)	14			—			—			—			(6		)
Tax benefits related to stock-based compensation	—		—		31,087			—			—			—			—			31,087
Disposition of subsidiary	—		—		(510		)	—			—			—			—			(510		)
Compensation costs:
Vested compensation awards, net	1,410		14		(14		)	—			—			—			—			—
Compensation costs included in net income	—		—		40,422			—			—			—			1,251			41,673
Cash distributions to noncontrolling interests	—		—		—			—			—			—			(26,702		)	(26,702		)
Net income	—		—		—			—			834,489			—			47,425			881,914
Net hedge gains included in continuing operations	—		—		—			—			—			(10,491		)	(13,738		)	(24,229		)
Balance as of December 31, 2011	121,856		$	1,331	$	3,613,808		$	(458,281	)	$	2,335,066		$	(3,130	)	$	162,344		$	5,651,138
Dividends declared ($0.08 per share)	—		—		—			—			(9,989		)	—			—			(9,989		)
Exercise of long-term incentive plan stock options and employee stock purchases	195		—		(849		)	10,842			(2,722		)	—			—			7,271
Purchase of treasury stock	(542	)	—		—			(63,136		)	—			—			(189		)	(63,325		)
Conversion of 2.875% convertible senior notes	—		—		(5		)	5			—			—			—			—
Tax benefits related to stock-based compensation	—		—		58,486			—			—			—			—			58,486
Deferred tax provision attributable to 2008 Pioneer Southwest initial public offering	—		—		(49,072		)	—			—			—			—			(49,072		)
Compensation costs:
Vested compensation awards, net	1,847		19		(19		)	—			—			—			—			—
Compensation costs included in net income	—		—		61,585			—			—			—			1,165			62,750
Cash distributions to noncontrolling interests	—		—		—			—			—			—			(35,903		)	(35,903		)
Net income	—		—		—			—			192,285			—			50,537			242,822
Net hedge losses included in continuing operations	—		—		—			—			—			3,130			—			3,130
Balance as of December 31, 2012	123,356		$	1,350	$	3,683,934		$	(510,570	)	$	2,514,640		$	—		$	177,954		$	5,867,308

The accompanying notes are an integral part of these consolidated financial statements.

73

PIONEER NATURAL RESOURCES COMPANY

CONSOLIDATED STATEMENTS OF EQUITY (continued)

(in thousands, except dividends per share)

			Equity Attributable to Common Stockholders
	Shares Outstanding		Common Stock		Additional Paid-in Capital			Treasury Stock			Retained Earnings			Noncontrolling Interests			Total Equity
Balance as of December 31, 2012	123,356		$	1,350	$	3,683,934		$	(510,570	)	$	2,514,640		$	177,954		$	5,867,308
Issuance of common stock	10,350		103		1,280,813			—						—			1,280,916
Dividends declared ($0.08 per share)	—		—		—			—			(11,145		)	—			(11,145		)
Exercise of long-term incentive plan stock options and employee stock purchases	222		—		11			10,043			—			—			10,054
Purchase of treasury stock	(154	)	—		—			(20,102		)	—			—			(20,102		)
Conversion of 2.875% senior convertible notes	4,381		—		(197,240		)	197,232			—			—			(8		)
Tax benefit related to conversion of 2.875% senior convertible notes	—		—		38,415			—						—			38,415
Tax benefits related to stock-based compensation	—		—		17,639			—			—			—			17,639
Pioneer Southwest merger:
Issuance of treasury stock to acquire outstanding PSE units	3,956		—		(178,621		)	178,621						—			—
Pioneer Southwest merger transaction costs	—		—		(3,880		)	—						—			(3,880		)
Pioneer Southwest noncontrolling interest transferred to APIC	—		—		168,685			—						(168,685		)	—
Deferred tax benefit associated with the Pioneer Southwest merger	—		—		200,091			—			—			—			200,091
Compensation costs:
Vested compensation awards, net	517		5		(5		)	—			—			—			—
Compensation costs included in net income	—		—		69,979			—			—			1,094			71,073
Cash distributions to noncontrolling interests	—		—		—			—			—			(36,054		)	(36,054		)
Net income (loss)	—		—		—			—			(838,414		)	38,865			(799,549		)
Balance as of December 31, 2013	142,628		$	1,458	$	5,079,821		$	(144,776	)	$	1,665,081		$	13,174		$	6,614,758

The accompanying notes are an integral part of these consolidated financial statements.

74

PIONEER NATURAL RESOURCES COMPANY

CONSOLIDATED STATEMENTS OF CASH FLOWS

(in thousands)

	Year Ended December 31,
	2013			2012			2011
Cash flows from operating activities:
Net income (loss)	$	(799,549	)	$	242,822		$	881,914
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depletion, depreciation and amortization	907,077			708,270			489,579
Impairment of oil and gas properties	1,495,242			—			354,408
Impairment of inventory and other property and equipment	61,812			5,719			3,126
Exploration expenses, including dry holes	21,379			31,189			32,529
Deferred income taxes	(222,374		)	286,229			181,330
(Gain) loss on disposition of assets, net	(209,021		)	(45,898		)	3,644
Accretion of discount on asset retirement obligations	11,862			8,677			7,506
Discontinued operations	612,880			497,579			(265,327		)
Interest expense	17,225			35,563			31,483
Derivative related activity	164,121			68,604			(221,899		)
Amortization of stock-based compensation	70,999			62,567			41,442
Amortization of deferred revenue	—			(42,069		)	(44,951		)
Other noncash items	(6,073		)	(45,293		)	3,599
Change in operating assets and liabilities
Accounts receivable, net	(122,914		)	(28,206		)	(47,331		)
Income taxes receivable	2,663			(5,953		)	29,406
Inventories	(39,062		)	33,059			(137,401		)
Prepaid expenses	(531		)	1,447			(3,415		)
Other current assets	3,964			14,291			1,957
Accounts payable	208,692			46,038			136,296
Interest payable	(5,709		)	10,842			(1,768		)
Income taxes payable	(62		)	(9,580		)	(7,623		)
Other current liabilities	(27,342		)	(38,320		)	61,210
Net cash provided by operating activities	2,145,279			1,837,577			1,529,714
Cash flows from investing activities:
Proceeds from disposition of assets, net of cash sold	711,027			95,564			819,044
Payments for acquisition, net of cash acquired	—			(297,092		)	—
Distribution from (investment in) unconsolidated subsidiary	25,050			—			(89,620		)
Additions to oil and gas properties	(2,638,799		)	(2,758,073		)	(1,926,965		)
Additions to other assets and other property and equipment, net	(237,082		)	(296,809		)	(363,246		)
Net cash used in investing activities	(2,139,804		)	(3,256,410		)	(1,560,787		)
Cash flows from financing activities:
Borrowings under long-term debt	466,864			1,776,618			196,616
Principal payments on long-term debt	(1,546,771		)	(612,001		)	(294,883		)
Proceeds from issuance of common stock, net of issuance costs	1,280,916			—			484,160
Proceeds from issuance of partnership common units, net of issuance costs	—			—			122,976
Distributions to noncontrolling interests	(36,054		)	(35,903		)	(26,702		)
Payments of other liabilities	(3,625		)	(1,153		)	(901		)
Exercise of long-term incentive plan stock options and employee stock purchases	10,054			7,271			3,696
Purchase of treasury stock	(20,102		)	(63,325		)	(40,355		)
Excess tax benefits from share-based payment arrangements	17,639			58,486			31,087
Payment of financing fees	(8		)	(9,227		)	(8,741		)
Dividends paid	(11,138		)	(10,021		)	(9,556		)
Net cash provided by financing activities	157,775			1,110,745			457,397
Net increase (decrease) in cash and cash equivalents	163,250			(308,088		)	426,324
Cash and cash equivalents, beginning of period	229,396			537,484			111,160
Cash and cash equivalents, end of period	$	392,646		$	229,396		$	537,484

The accompanying notes are an integral part of these consolidated financial statements.

75

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2013, 2012 and 2011

NOTE A.    Organization and Nature of Operations

Pioneer Natural Resources Company ("Pioneer" or "the Company") is a Delaware corporation whose common stock is listed and traded on the New York Stock Exchange. The Company is a large independent oil and gas exploration and production company in the United States, with continuing field operations in the Permian Basin in West Texas, the Eagle Ford Shale play in South Texas, the Raton field in southeastern Colorado, the Hugoton field in southwest Kansas and the West Panhandle field in the Texas Panhandle. The Company's objective is to maximize shareholder investment returns by maintaining financial flexibility, capital allocation discipline and enhancing net asset value through accretive drilling programs, joint ventures and acquisitions.

NOTE B.    Summary of Significant Accounting Policies

Principles of consolidation. The consolidated financial statements include the accounts of the Company and its wholly-owned and majority-owned subsidiaries since their acquisition or formation. In accordance with generally accepted accounting principles in the United States ("GAAP"), the Company proportionately consolidates certain affiliate partnerships that are less than wholly-owned and are involved in oil and gas producing activities. All material intercompany balances and transactions have been eliminated.

Certain reclassifications have been made to the 2012 and 2011 financial statement and footnote amounts in order to conform them to the 2013 presentations.

In addition, the presentation of purchases and sales of third-party oil and gas has been revised in 2012 and 2011 to present separately the gross sales of purchased oil and gas and costs of purchased oil and gas. Previously, the sales and purchases were netted in other expense. Revenues and costs from the purchase and sale transactions are presented on a gross basis as the Company acts as a principal in the transactions by assuming the risks and rewards of ownership, including credit risk, of the oil and gas purchased and assumes responsibility to deliver the oil and gas volumes sold. This revision did not impact the Company's balance sheet, net income (loss) from continuing operations, equity or cash flows. While not material to the 2012 and 2011 financial statements as a whole, the presentation has been revised to enhance consistency. The following individual line items were affected in addition to total revenues and other income, and total costs and expenses:

	Year Ended December 31,
	2012		2011
	(in thousands)
Sales of purchased oil and gas, as previously reported	$	—	$	—
Revision of sales of purchased oil and gas	122,093		14,542
Sales of purchased oil and gas, reported herein	$	122,093	$	14,542
Purchased oil and gas, as previously reported	$	—	$	—
Revision of purchased oil and gas	120,408		13,949
Purchased oil and gas, reported herein	$	120,408	$	13,949
Other expense, as previously reported (excluding amounts included in discontinued operations)	$	112,490	$	62,478
Revision of other expense	1,685		593
Other expense, reported herein	$	114,175	$	63,071

Use of estimates in the preparation of financial statements. Preparation of the accompanying consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting periods. Depletion of oil and gas properties and impairment of goodwill and proved and unproved oil and gas properties, in part, is determined using estimates of proved, probable and possible oil and gas reserves. There are numerous uncertainties inherent in the estimation of quantities of proved, probable and possible reserves and in the projection of future rates of production and the timing of development expenditures. Similarly, evaluations for impairment of proved and unproved oil and gas properties are subject to numerous uncertainties including, among others, estimates of future recoverable reserves and commodity price outlooks. Actual results could differ from the estimates and assumptions utilized.

76

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2013, 2012, and 2011

Cash and cash equivalents. The Company's cash and cash equivalents include depository accounts held by banks and marketable securities with original issuance maturities of 90 days or less.

Accounts receivable. As of December 31, 2013 and 2012, the Company had accounts receivable – trade, net of allowances for bad debts, of $430.7 million and $316.9 million, respectively. The Company's accounts receivable – trade are primarily comprised of oil and gas sales receivables, joint interest receivables and other receivables for which the Company does not require collateral security.

As of December 31, 2013 and 2012, the Company's allowances for doubtful accounts totaled $1.4 million and $1.5 million, respectively. The Company establishes allowances for bad debts equal to the estimable portions of accounts receivable for which failure to collect is considered probable. The Company estimates the portions of joint interest receivables for which failure to collect is probable based on percentages of joint interest receivables that are past due. The Company estimates the portions of other receivables for which failure to collect is probable based on the relevant facts and circumstances surrounding the receivable. Allowances for doubtful accounts are recorded as reductions to the carrying values of the receivables included in the Company's consolidated balance sheets and as charges to other expense in the consolidated statements of operations in the accounting periods during which failure to collect an estimable portion is determined to be probable.

Inventories. The Company's inventories consist of materials, supplies and commodities. The Company's materials and supplies inventory is primarily comprised of oil and gas drilling or repair items such as tubing, casing, proppant used to fracture-stimulate oil and gas wells, chemicals, operating supplies and ordinary maintenance materials and parts. The materials and supplies inventory is primarily acquired for use in future drilling operations or repair operations and is carried at the lower of cost or market, on a first-in, first-out cost basis. Valuation reserve allowances for materials and supplies inventories are recorded as reductions to the carrying values of the materials and supply inventories in the Company's consolidated balance sheets and as charges to other expense in the accompanying consolidated statements of operations.

Commodities inventories are carried at the lower of average cost or market, on a first-in, first-out basis. The Company's commodities inventories consist of oil held in storage and natural gas liquids ("NGLs") and gas pipeline fill volumes. Any valuation allowances of commodities inventories are recorded as reductions to the carrying values of the commodities inventories included in the Company's consolidated balance sheets and as charges to other expense in the consolidated statements of operations.

The following table presents the Company's materials and supplies and commodities inventories as of December 31, 2013 and 2012:

	Year Ended December 31,
	2013			2012
	(in thousands)
Materials and supplies (a)	$	210,792		$	258,962
Commodities	13,429			5,446
Less: Noncurrent materials and supplies (b)	(4,096		)	(67,352		)
	$	220,125		$	197,056

____________________

(a) As of December 31, 2013 and 2012, the Company's materials and supplies inventories were net of valuation reserve allowances of $31.8 million and $4.6 million, respectively. See Note D for additional information regarding inventory impairments.

(b) Included in other noncurrent assets in the Company's accompanying consolidated balance sheet.

Oil and gas properties. The Company utilizes the successful efforts method of accounting for its oil and gas properties. Under this method, all costs associated with productive wells and nonproductive development wells are capitalized while nonproductive exploration costs and geological and geophysical expenditures are expensed. The Company capitalizes interest on expenditures for significant development projects, generally when the underlying project is sanctioned, until such projects are ready for their intended use. For large development projects requiring significant upfront development costs to support the drilling and production of a planned group of wells, the Company continues to capitalize interest on the portion of the development costs attributable to the planned wells yet to be drilled.

The Company does not carry the costs of drilling an exploratory well as an asset in its consolidated balance sheets following the completion of drilling unless both of the following conditions are met:

77

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2013, 2012, and 2011

(i) The well has found a sufficient quantity of reserves to justify its completion as a producing well.

(ii) The Company is making sufficient progress assessing the reserves and the economic and operating viability of the project.

Due to the capital intensive nature and the geographical location of certain projects, it may take an extended period of time to evaluate the future potential of an exploration project and the economics associated with making a determination on its commercial viability. In these instances, the project's feasibility is not contingent upon price improvements or advances in technology, but rather the Company's ongoing efforts and expenditures related to accurately predicting the hydrocarbon recoverability based on well information, gaining access to other companies' production data in the area, transportation or processing facilities and/or getting partner approval to drill additional appraisal wells. These activities are ongoing and are being pursued constantly. Consequently, the Company's assessment of suspended exploratory well costs is continuous until a decision can be made that the project has found sufficient proved reserves to sanction the project or is noncommercial and is charged to exploration and abandonments expense. See Note F for additional information regarding the Company's suspended exploratory well costs.

The Company owns interests in six gas processing plants and nine treating facilities. The Company is the operator of two of the gas processing plants and all nine of the treating facilities. The Company's ownership interests in the gas processing plants and treating facilities are primarily to accommodate handling the Company's gas production and thus are considered a component of the capital and operating costs of the respective fields that they service. To the extent that there is excess capacity at a plant or treating facility, the Company attempts to process third party gas volumes for a fee to keep the plant or treating facility at capacity. All revenues and expenses derived from third party gas volumes processed through the plants and treating facilities are reported as components of oil and gas production costs. Third party revenues generated from the processing plants and treating facilities in continuing operations for the three years ended December 31, 2013, 2012 and 2011 were $57.2 million, $34.4 million and $42.6 million, respectively. Third party expenses attributable to the processing plants and treating facilities in continuing operations for the same respective periods were $30.1 million, $26.5 million and $22.6 million. The capitalized costs of the plants and treating facilities are included in proved oil and gas properties and are depleted using the unit-of-production method along with the other capitalized costs of the field that they service.

The capitalized costs of proved properties are depleted using the unit-of-production method based on proved reserves. Costs of significant nonproducing properties, wells in the process of being drilled and development projects are excluded from depletion until the related project is completed and proved reserves are established or, if unsuccessful, impairment is determined.

Proceeds from the sales of individual properties and the capitalized costs of individual properties sold or abandoned are credited and charged, respectively, to accumulated depletion, depreciation and amortization, if doing so does not materially impact the depletion rate of an amortization base. Generally, no gain or loss is recognized until an entire amortization base is sold. However, gain or loss is recognized from the sale of less than an entire amortization base if the disposition is significant enough to materially impact the depletion rate of the remaining properties in the amortization base.

The Company performs assessments of its long-lived assets to be held and used, including proved oil and gas properties accounted for under the successful efforts method of accounting, whenever events or circumstances indicate that the carrying value of those assets may not be recoverable. An impairment loss is indicated if the sum of the expected future cash flows is less than the carrying amount of the assets. In these circumstances, the Company recognizes an impairment loss for the amount by which the carrying amount of the assets exceeds the estimated fair value of the assets. See Note D for additional information regarding the Company's impairment of proved oil and gas properties.

Unproved oil and gas properties are periodically assessed for impairment on a project-by-project basis. These impairment assessments are affected by the results of exploration activities, commodity price outlooks, planned future sales or expirations of all or a portion of such projects. If the estimated future net cash flows attributable to such projects are not expected to be sufficient to fully recover the costs invested in each project, the Company will recognize an impairment loss at that time.

Goodwill. During 2004, the Company recorded goodwill associated with a business combination, which represents the cost of an acquired entity over the net amounts assigned to assets acquired and liabilities assumed. In accordance with GAAP, goodwill is not amortized to earnings, but is assessed for impairment whenever events or circumstances indicate that impairment of the carrying value of goodwill is likely, but no less often than annually. If the carrying value of goodwill is determined to be impaired, it is reduced for the impaired value with a corresponding charge to earnings in the period in which it is determined to be impaired. During the third quarter of 2013, the Company performed a qualitative assessment of goodwill to determine whether it was more likely than not that the fair value of the Company's reporting unit was less than its carrying amount as a basis for determining

78

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2013, 2012, and 2011

whether it was necessary to perform the two-step goodwill impairment test. Based upon the results of the assessment, the Company determined that it was not likely that the Company's goodwill was impaired.

For the year ended December 31, 2013, the Company reduced the carrying value of goodwill by $23.8 million, reflecting the portion of the Company's goodwill related to assets sold or included in assets held for sale at December 31, 2013, primarily associated with the sale of 40 percent of Pioneer's interest in 207,000 net acres leased by the Company in the horizontal Wolfcamp Shale play in the southern portion of the Spraberry field in West Texas, and the planned sales of the Company's Alaska subsidiary and Barnett Shale net assets. See Note C for additional information regarding the Company's divestitures. At December 31, 2013, the Company performed a qualitative assessment of its remaining goodwill to determine whether it is more likely than not that the fair value of the Company's reporting unit is less than its carrying amount, and the Company determined that it is not likely that the Company's remaining goodwill is impaired.

Other property and equipment, net. Other property and equipment is recorded at cost. At December 31, 2013 and 2012, respectively, the net carrying value of other property and equipment consisted of the following:

	Year Ended December 31,
	2013 (a)		2012 (a)
	(in thousands)
Proved and unproved sand properties (b)	$	451,384	$	457,033
Equipment and rigs (c)	313,165		385,887
Land and buildings	344,554		259,629
Transportation equipment	41,397		44,928
Furniture and fixtures	47,905		43,614
Leasehold improvements	25,748		26,603
	$	1,224,153	$	1,217,694

____________________

(a) At December 31, 2013 and 2012, other property and equipment was net of accumulated depreciation of $458.4 million and $395.9 million, respectively.

(b) Includes sand mines, sales facilities and unproved leaseholds that primarily provide the Company and other unrelated customers with proppant used in the fracture stimulation of oil and gas wells.

(c) Includes drilling rigs, well servicing rigs and equipment and fracture stimulation equipment including assets owned by subsidiaries that provide drilling, pumping and well services on Company-operated properties. As of December 31, 2013, the Company owned 15 drilling rigs, eleven fracture stimulation fleets and other oilfield services equipment, including pulling units, fracture stimulation tanks, water transport trucks, hot oilers, blowout preventers, construction equipment and fishing tools. During December 2013, the Company committed to a plan to sell its majority interest in Sendero Drilling Company, LLC ("Sendero"), which owns the Company's 15 vertical drilling rigs, to Sendero's minority interest owner. Associated therewith, the Company has classified the assets and liabilities of Sendero, including $17.9 million of drilling rigs, as assets held for sale in the accompanying consolidated balance sheet as of December 31, 2013. See Note C for additional information.

The primary purposes of the Company's sand mines and drilling, pumping and well services operations are to accommodate the Company's drilling and producing operations by increasing the availability of supplies, equipment and services, rather than being dependent on third-party availability, and to contain associated costs. All intercompany gains or losses of the Company's sand mines and drilling, pumping and well services operations are eliminated.

Earnings from sales of proppant and from providing drilling, pumping and well services to third-party customers and working interest owners in Company-operated properties are included in interest and other income in the accompanying consolidated statements of operations.

The capitalized costs of proved sand properties are depleted using the unit-of-production method based on proved sand reserves. Equipment items are generally depreciated by individual component on a straight line basis over their economic useful lives, which are generally from two to 12 years. Leasehold improvements are amortized over the lesser of their economic useful lives or the underlying terms of the associated leases.

79

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2013, 2012, and 2011

The Company evaluates other property and equipment for potential impairment whenever indicators of impairment are present. Circumstances that could indicate potential impairment include: significant adverse changes in industry trends and the economic outlook; legal actions; regulatory changes; and significant declines in utilization rates or oil and gas prices. If it is determined that other property and equipment is potentially impaired, the Company performs an impairment evaluation by estimating the future undiscounted net cash flow from the use and eventual disposition of other property and equipment grouped at the lowest level that cash flows can be identified. If the sum of the future undiscounted net cash flows is less than the net book value of the property, an impairment loss is recognized for the excess, if any, of the assets' net book value over its estimated fair value.

Investment in unconsolidated affiliate. During 2010, the Company formed EFS Midstream LLC ("EFS Midstream") to own and operate gas and liquids gathering, treating and transportation assets in the Eagle Ford Shale play in South Texas. During June 2010, the Company sold a 49.9 percent member interest in EFS Midstream to an unaffiliated third party for $46.4 million of cash proceeds. Associated therewith, the Company recorded a $46.2 million deferred gain that is being amortized as a reduction in production costs over a 20 year period, representing the term of a continuing commitment of Pioneer to deliver production volumes through EFS Midstream handling and gathering facilities. The deferred gain is included in other current and noncurrent liabilities in the Company's accompanying consolidated balance sheet.

The Company does not have control of EFS Midstream. Consequently, the Company accounts for this investment under the equity method of accounting for investments in unconsolidated affiliates. Under the equity method, the Company's investment in unconsolidated affiliates is increased for investments made and the investor's share of the investee's net income, and decreased for distributions received, the carrying value of member interests sold and the investor's share of the investee's net losses.

The Company's equity interest in the net income or loss of EFS Midstream is recorded in interest and other income, net of eliminations of the profit associated with gathering, treating and transportation fees charged to the Company by EFS Midstream, in the accompanying consolidated statements of operations. See Note M for the Company's equity interest in the net income of EFS Midstream for the years ended December 31, 2013, 2012 and 2011.

Asset retirement obligations. The Company records a liability for the fair value of an asset retirement obligation in the period in which it is incurred if a reasonable estimate of fair value can be made. Asset retirement obligations are generally capitalized as part of the carrying value of the long-lived asset to which it relates. Conditional asset retirement obligations meet the definition of liabilities and are recognized when incurred if their fair values can be reasonably estimated.

The Company records the current and noncurrent portions of asset retirement obligations in other current liabilities and other liabilities, respectively, in the accompanying consolidated balance sheets and expenditures are classified as cash used in operating activities in the accompanying consolidated statements of cash flows. See Note I for additional information about the Company's asset retirement obligations.

Treasury stock. Treasury stock purchases are recorded at cost. Upon reissuance, the cost of treasury shares held is reduced by the average purchase price per share of the aggregate treasury shares held.

Issuance of common stock. In February 2013, the Company issued 10.35 million shares of its common stock and realized $1.3 billion of cash proceeds, net of associated underwriting and offering expenses.

Noncontrolling interest in consolidated subsidiaries. The Company owns the majority interests in certain subsidiaries with operations in the United States. Prior to December 17, 2013, the Company owned a 0.1 percent general partner interest and a 52.4 percent limited partner interest in Pioneer Southwest Energy Partners L.P. ("Pioneer Southwest") and consolidated the financial position, results of operations and cash flows of Pioneer Southwest with those of Pioneer. Pioneer Southwest owned proved and unproved oil and gas properties in the Spraberry field in the Permian Basin of West Texas. On December 17, 2013, the holders of a majority of the outstanding common units of Pioneer Southwest approved an amended agreement and plan of merger, pursuant to which (i) all of the then outstanding common units of Pioneer Southwest were canceled and converted into the right to receive 0.2325 of a share of common stock of the Company and (ii) Pioneer Southwest became a wholly-owned subsidiary of the Company. The changes in the Company's ownership of Pioneer Southwest were accounted for by eliminating the noncontrolling interest attributable to Pioneer Southwest. See Note C for additional information about Pioneer Southwest and the amended agreement and plan of merger.

Noncontrolling interests in the net assets of consolidated subsidiaries totaled $13.2 million and $178.0 million as of December 31, 2013 and 2012, respectively. The Company recorded net income attributable to the noncontrolling interests of $38.9 million, $50.5 million and $47.4 million for the years ended December 31, 2013, 2012 and 2011, respectively.

80

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2013, 2012, and 2011

In accordance with GAAP, the Company records transfers of any gains or losses, net of taxes, from noncontrolling interests in consolidated subsidiaries to additional paid in capital proportionate to the ownership after giving effect to the purchase or sale of common units. The following table presents the Company's net income or loss attributable to common stockholders adjusted for changes in equity as a result of transactions that changed the Company's ownership interest in Pioneer Southwest:

	Year Ended December 31,
	2013			2012			2011
	(in thousands)
Net income (loss) attributable to common stockholders	$	(838,414	)	$	192,285		$	834,489
Transfers from the noncontrolling interest in consolidated subsidiaries:
Increase in additional paid in capital from the sale of 1.8 million Pioneer Southwest common units during 2011, net of tax of $15.4 million	—			—			26,915
Increase in additional paid in capital from Pioneer Southwest's offering of 2.6 million common units during 2011, net of tax of $23.7 million	—			—			8,104
Decrease in additional paid in capital for deferred taxes recognized attributable to Pioneer Southwest's 2008 initial public offering of 9.5 million common units	—			(49,072		)	—
Increase in additional paid in capital from Pioneer Southwest merger	168,685			—			—
Increase in additional paid in capital from deferred taxes recognized attributable to Pioneer Southwest merger	200,091			—			—
Decrease in additional paid in capital from Pioneer Southwest merger transaction costs	(3,880		)	—			—
Net increase (decrease) in equity from transactions with noncontrolling interests	364,896			(49,072		)	35,019
Net income (loss) attributable to common stockholders and changes in equity from transactions with noncontrolling interests	$	(473,518	)	$	143,213		$	869,508

Revenue recognition. The Company recognizes revenue when it is realized or realizable and earned. Revenues are considered realized or realizable and earned when: (i) persuasive evidence of an arrangement exists, (ii) delivery has occurred or services have been rendered, (iii) the seller's price to the buyer is fixed or determinable and (iv) collectability is reasonably assured.

The Company uses the entitlements method of accounting for oil, NGLs and gas revenues. Sales proceeds in excess of the Company's entitlement are included in other liabilities and the Company's share of sales taken by others is included in other assets in the accompanying consolidated balance sheets.

The Company had no material oil or NGL entitlement assets or liabilities as of December 31, 2013 or 2012. The following table presents the Company's gas entitlement assets and liabilities with their associated volumes as of December 31, 2013 and 2012. Gas volumes are presented in millions of cubic feet ("MMCF").

	December 31,
	2013			2012
	Amount		Volume	Amount		Volume
	(dollars in millions)
Gas entitlement assets	$	7.4	2,990	$	6.8	2,870
Gas entitlement liabilities	$	2.5	715	$	1.9	582

The Company enters into oil and gas purchase transactions with third parties and separate sale transactions with third parties to satisfy unused pipeline capacity commitments and to diversify a portion of the Company's WTI oil sales to a Gulf Coast oil price.  Revenues and expenses from these transactions are presented on a gross basis as the Company acts as a principal in the transaction by assuming the risk and rewards of ownership, including credit risk, of the oil and gas purchased and assuming responsibility to deliver the oil and gas volumes sold. Deficiency payments on excess pipeline capacity are included in other expense in the accompanying consolidated statements of operations. See Note N for further information on transportation commitment charges.

81

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2013, 2012, and 2011

The Company recognized revenue of $42.1 million and $45.0 million during 2012 and 2011, respectively from volumetric production payment ("VPP") agreements which represented limited-term overriding royalty interests in oil reserves that: (i) entitled the purchaser to receive production volumes over a period of time from specific lease interests, (ii) were free and clear of all associated production costs and capital expenditures associated with the reserves, (iii) were nonrecourse to the Company (i.e., the purchaser's only recourse was to the reserves acquired), (iv) transferred title of the reserves to the purchaser and (v) allowed the Company to retain the remaining reserves after the VPPs volumetric quantities had been delivered. The Company had no VPP obligations in 2013 as all VPP production volumes were delivered as of December 31, 2012; as such, the Company recognized no VPP revenue in 2013.

Derivatives. All derivatives are recorded in the accompanying consolidated balance sheets at estimated fair value. Effective February 1, 2009, the Company discontinued hedge accounting on all of its then-existing hedge contracts. The effective portions of the discontinued deferred hedges as of February 1, 2009 were included in accumulated other comprehensive income (loss) ("AOCI - Hedging") and were transferred to earnings during the same periods in which the forecasted hedged transactions were recognized in the Company's earnings. During 2012, the remaining AOCI - Hedging losses were transferred to earnings. Since discontinuing hedge accounting, the Company has recognized all changes in the fair values of its derivative contracts as gains or losses in the earnings of the periods in which they occur.

The Company classifies the fair value amounts of derivative assets and liabilities executed under master netting arrangements as net current or noncurrent derivative assets or net current or noncurrent derivative liabilities, whichever the case may be, by commodity and counterparty. Net derivative asset values are determined, in part, by utilization of the derivative counterparties' credit-adjusted risk-free rate curves and net derivative liabilities are determined, in part, by utilization of the Company's and, through the date of the merger, Pioneer Southwest's credit-adjusted risk-free rate curves. The credit-adjusted risk-free rate curves for the Company and the counterparties are based on their independent market-quoted credit default swap rate curves plus the United States Treasury Bill yield curve as of the valuation date. Pioneer Southwest's credit-adjusted risk-free rate curve was based on independent market-quoted forward London Interbank Offered Rate ("LIBOR") curves plus 162.5 basis points, representing Pioneer Southwest's estimated borrowing rate. See Note E for additional information about the Company's derivative instruments.

Environmental. The Company's environmental expenditures are expensed or capitalized depending on their future economic benefit. Expenditures that relate to an existing condition caused by past operations and that have no future economic benefits are expensed. Expenditures that extend the life of the related property or mitigate or prevent future environmental contamination are capitalized. Liabilities for expenditures that will not qualify for capitalization are recorded when environmental assessment and/or remediation is probable and the costs can be reasonably estimated. Such liabilities are undiscounted unless the timing of cash payments for the liability is fixed or reliably determinable. Environmental liabilities normally involve estimates that are subject to revision until settlement occurs.

Stock-based compensation. For stock-based compensation awards granted or modified, stock-based compensation expense is being recognized in the Company's financial statements on a straight line basis over the awards' vesting periods based on their fair values on the dates of grant or modification, as applicable. The stock-based compensation awards generally vest over a period not exceeding three years. The amount of stock-based compensation expense recognized at any date is approximately equal to the ratable portion of the grant date value of the award that is vested at that date. The Company utilizes (i) the Black-Scholes option pricing model to measure the fair value of stock options, (ii) the prior day's closing stock price on the date of grant for the fair value of restricted stock, restricted stock units, partnership unit awards or phantom unit awards that are expected to be settled in the Company's common stock ("Equity Awards"), (iii) the Monte Carlo simulation method for the fair value of performance unit awards and (iv) a probabilistic forecasted fair value method for Series B unit awards issued by Sendero.

Stock-based compensation liability awards are awards that are expected to be settled in cash on their vesting dates, rather than in equity shares or units ("Liability Awards"). Stock-based Liability Awards are recorded as accounts payable—affiliates based on the vested portion of the fair value of the awards on the balance sheet date. The fair values of Liability Awards are updated at each balance sheet date and changes in the fair values of the vested portions of the awards are recorded as increases or decreases to stock-based compensation expense.

Segments. Operating segments are defined as components of an enterprise that (i) engage in activities from which it may earn revenues and incur expenses (ii) for which separate operational financial information is available and is regularly evaluated by the chief operating decision maker for the purpose of allocating resources and assessing performance.

Based upon how the Company is organized and managed, the Company has only one reportable operating segment, which is oil and gas exploration and production. The Company considers its vertical integration services as ancillary to its oil and gas

82

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2013, 2012, and 2011

exploration and producing activities and manages these services to support such activities. In addition, the Company has a single, company-wide management team that allocates capital resources to maximize profitability and measures financial performance as a single enterprise.

Assets held for sale and discontinued operations. On the date at which the Company meets all the held for sale criteria, the Company discontinues the recording of depletion and depreciation of the assets or asset group to be sold and reclassifies the assets and related liabilities to be sold as held for sale on the accompanying consolidated balance sheets. The assets and liabilities are measured at the lower of their carrying amount or estimated fair value less cost to sell.

In addition, after determining that held for sale criteria has been met, the Company considers whether the held for sale assets meet the criteria to be considered discontinued operations. If the assets held for sale are considered discontinued operations, the Company classifies the results of operations from the assets held for sale as income or loss from discontinued operations, net of tax in the accompanying consolidated statements of operations for the current period and all prior periods. See Note C for additional information about the Company's divestitures.

New accounting pronouncements. In July 2013, the Financial Accounting Standards Boards issued Accounting Standards Update ("ASU") 2013-11, "Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists," which provides guidance on the presentation of unrecognized tax benefits. The adoption of ASU 2013-11 during the third quarter of 2013 did not have a material impact on the Company's financial position and had no impact on the Company's statements of operations or cash flows.

NOTE C. Acquisitions and Divestitures

Pioneer Southwest Merger Transaction

On December 17, 2013, the Company completed the acquisition of all of the outstanding common units of Pioneer Southwest not already owned by the Company, through a merger of a wholly-owned subsidiary of the Company into Pioneer Southwest, the result of which was that Pioneer Southwest became a wholly-owned subsidiary of the Company. The merger was effected pursuant to an Agreement and Plan of Merger dated August 9, 2013, as amended on October 25, 2013 (as amended, the "Merger Agreement"), and was approved by the holders of the common units of Pioneer Southwest at a special meeting held on December 17, 2013.

Pursuant to the Merger Agreement, all of the common units outstanding as of the closing of the merger except for the common units owned by the Company, were canceled and converted into the right to receive 0.2325 of a share of common stock of the Company per common unit (the "Conversion Ratio"). In lieu of receiving any fractional share of common stock to which any holder of the Pioneer Southwest's common units would otherwise have been entitled, after aggregating all fractions of shares to which such holder would be entitled, any fractional share was rounded up to a whole share of common stock of the Company. Consequently, in December 2013, the Company issued an aggregate of 3.96 million shares of its common stock to Pioneer Southwest unitholders. The merger is expected to facilitate the Company's plans to fully and optimally develop the Company's properties in the Midland Basin in West Texas utilizing horizontal drilling and is expected to enhance the Company's organizational, operational and administrative efficiencies.

On December 18, 2013, the Company caused Pioneer Southwest, its general partner and all of Pioneer Southwest's subsidiaries to be merged with and into a wholly-owned subsidiary of the Company, the result of which was that all common units of Pioneer Southwest were canceled and the Company no longer holds any common units.

Premier Silica Business Combination

On April 2, 2012, a wholly-owned subsidiary of the Company acquired an industrial sand mining business that is now named Premier Silica LLC ("Premier Silica"). Premier Silica's primary mine operations are in Brady, Texas. The Brady mine facilities primarily produce, process and provide sand to the Company for use as proppant in its fracture stimulation of oil and gas wells in Texas. Premier Silica's sand production that is in excess of the Company's sand needs for fracture stimulation and sand production that is not usable for fracture stimulation is primarily sold to third parties for industrial and recreational purposes. The aggregate purchase price of Premier Silica was $297.1 million, including closing adjustments.

83

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2013, 2012, and 2011

Divestitures Recorded in Continuing Operations

During December 2013, the Company committed to a plan to sell the Company's majority interest in Sendero to Sendero's minority interest owner for $31.0 million, subject to negotiating a definitive sales agreement and the buyer completing its financing arrangements. Associated with the planned sale of Sendero, the Company recorded a noncash loss of $25.5 million in other expense during December 2013 to reduce the carrying value of Sendero's net assets to their estimated fair value. As part of the sales negotiations, the Company plans to commit to lease 12 Sendero rigs through December 31, 2015, and to lease eight Sendero rigs in 2016. The Company has classified Sendero assets and liabilities as held for sale in the accompanying consolidated balance sheet as of December 31, 2013.

The Company recorded net gains on disposition of assets in continuing operations of $209.0 million and $45.9 million during the years ended December 31, 2013 and 2012, respectively, and a net loss on disposition of assets in continuing operations of $3.6 million during the year ended December 31, 2011. The following describes the significant divestitures included in continuing operations:

• Southern Wolfcamp. In January 2013, the Company signed an agreement with Sinochem Petroleum USA LLC ("Sinochem"), a U.S. subsidiary of the Sinochem Group, an unaffiliated third party, to sell 40 percent of Pioneer's interest in 207,000 net acres leased by the Company in the horizontal Wolfcamp Shale play in the southern portion of the Spraberry field in West Texas for total consideration of $1.8 billion, including normal closing adjustments. In May 2013, the Company completed the sale to Sinochem for net cash proceeds of $623.8 million, including normal closing adjustments, resulting in a gain of $181.3 million related to the unproved property interests conveyed to Sinochem. Sinochem is paying the remaining $1.2 billion of the transaction price by carrying 75 percent of Pioneer's portion of ongoing drilling and facilities costs attributable to the Company's joint operations with Sinochem in the horizontal Wolfcamp Shale play.

• West Panhandle. During the first quarter of 2013, the Company completed a sale of its interest in unproved oil and gas properties adjacent to the Company's West Panhandle field operations for net cash proceeds of $38.1 million, which resulted in a gain of $22.4 million,

• Eagle Ford Shale. In January 2012, the Company sold a portion of its interest in an unproved oil and gas property in the Eagle Ford Shale play to unaffiliated third parties for cash proceeds of $54.7 million, which resulted in a gain of $42.6 million.

• Other. During 2013, 2012 and 2011, the Company sold other proved and unproved properties, inventory and other property and equipment and recorded net gains of $5.3 million and $3.3 million during 2013 and 2012, respectively, and a net loss of $3.6 million during 2011.

Discontinued Operations

Alaska. During the fourth quarter of 2013, the Company committed to a plan to sell 100 percent of the capital stock in Pioneer's Alaska subsidiary, representing all the Company's net assets in Alaska ("Pioneer Alaska"). The sale of Pioneer Alaska continues to be subject to ongoing negotiations and certain other conditions, such as governmental approvals and buyer's arrangement of financing.

The Company has classified (i) Pioneer Alaska assets and liabilities as held for sale in the accompanying consolidated balance sheet as of December 31, 2013 and (ii) Pioneer Alaska results of operations as income (loss) from discontinued operations, net of tax in the accompanying consolidated statements of operations (including a recasting of the Pioneer Alaska results of operations for the years ended December 31, 2012 and 2011, which were originally classified as continuing operations).

Associated with the planned sale of Pioneer Alaska, the Company recorded a noncash impairment charge of $539.8 million in discontinued operations during December 2013 to reduce the carrying value of Pioneer Alaska to its estimated fair value less costs to sell of $350.6 million. See Note D for additional information about the Pioneer Alaska impairment charge. The recasting of Pioneer Alaska results includes the sale of the Company's interest in the Cosmopolitan Unit in the Cook Inlet of Alaska in August 2012 to unaffiliated third parties for cash proceeds of $10.1 million, which, together with certain Company obligations assumed by the purchasers, resulted in a gain of $12.6 million.

Barnett Shale. During the fourth quarter of 2013, the Company committed to a plan to divest of its net assets in the Barnett Shale field in North Texas. The plan is expected to result in the sale of the Barnett Shale net assets during 2014. The Company has classified its (i) Barnett Shale assets and liabilities as held for sale in the accompanying consolidated balance sheet as of

84

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2013, 2012, and 2011

December 31, 2013 and (ii) Barnett Shale results of operations as income (loss) from discontinued operations, net of tax in the accompanying consolidated statements of operations (including a recasting of the Barnett Shale results of operations for the years ended December 31, 2012 and 2011, which were originally classified as continuing operations).

Associated with the Company's plan to sell its net assets in the Barnett Shale field, the Company recorded a noncash impairment charge of $189.5 million in discontinued operations in December 2013 to reduce the carrying value of its net assets in the Barnett Shale field to their estimated fair value less costs to sell. See Note D for more information about the impairment of Barnett Shale net assets. Also included in discontinued operations in 2013 is the sale of the Company's interest in certain proved and unproved oil and gas properties in the Barnett Shale field for net cash proceeds of $33.8 million, which resulted in a gain of $8.7 million on the unproved properties sold.

The Company's plans to sell Pioneer Alaska and the Barnett Shale net assets are in differing stages of marketing and negotiation. No assurance can be given that the sales will be completed in accordance with the Company's plans.

South Africa. In December 2011, the Company committed to a plan to exit South Africa and initiated a process to divest its net assets in South Africa ("Pioneer South Africa"). During the first quarter of 2012, the Company agreed to sell its net assets in Pioneer South Africa to an unaffiliated third party, effective January 1, 2012, for $60.0 million of cash proceeds before normal closing and other adjustments, and the buyer's assumption of certain liabilities of the Company's South Africa subsidiaries. In August 2012, the Company completed the sale of Pioneer South Africa for net cash proceeds of $15.9 million, including normal closing adjustments for cash revenues and costs and expenses from the effective date through the date of the sale, resulting in a gain of $28.6 million. The Company classified Pioneer South Africa's results of operations as income from discontinued operations, net of tax in the accompanying consolidated statements of operations.

Tunisia. In February 2011, the Company sold 100 percent of the Company's share holdings in Pioneer Natural Resources Tunisia Ltd. and Pioneer Natural Resources Anaguid Ltd. (referred to in the aggregate as "Pioneer Tunisia") to an unaffiliated third party for cash proceeds of $802.5 million, including normal closing adjustments and excluding cash and cash equivalents sold, resulting in a gain of $645.2 million. Accordingly, the Company has classified the results of operations of Pioneer Tunisia as discontinued operations, net of tax in the accompanying consolidated statements of operations.

85

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2013, 2012, and 2011

The following table represents the components of the Company's discontinued operations for the years ended December 31, 2013, 2012 and 2011:

	Year Ended December 31,
	2013			2012			2011
	(in thousands)
Revenues and other income:
Oil and gas	$	260,503		$	285,542		$	314,124
Interest and other (a)	38,642			29,437			45,145
Gain on disposition of assets, net (b)	8,764			40,735			645,241
	307,909			355,714			1,004,510
Costs and expenses:
Oil and gas production	90,333			79,853			55,698
Production and ad valorem taxes	10,151			9,034			8,239
Depletion, depreciation and amortization (b)	103,787			101,921			130,606
Impairment of oil and gas properties (b) (c)	729,305			532,589			—
Exploration and abandonments	52,707			108,076			44,898
General and administrative	12,261			6,061			13,517
Accretion of discount on asset retirement obligations (b)	831			2,731			3,436
Interest	—			—			829
Other	9,021			2,096			5,849
	1,008,396			842,361			263,072
Income (loss) from discontinued operations before income taxes	(700,487		)	(486,647		)	741,438
Current tax provision	(5,591		)	(10,387		)	(46,012		)
Deferred tax (provision) benefit (b)	256,473			192,824			(221,302		)
Income (loss) from discontinued operations	$	(449,605	)	$	(304,210	)	$	474,124

 ____________________

(a) Primarily comprised of Alaskan Petroleum Production Tax credits on qualifying capital expenditures of $38.6 million, $29.3 million and $38.9 million for the years ended December 31, 2013, 2012 and 2011, respectively.

(b) Represents significant noncash components of discontinued operations.

(c) Represents a noncash impairment charge of $539.8 million on Pioneer Alaska net assets during the year ended December 31, 2013 and noncash impairment charges of $189.5 million and $532.6 million during the years ended December 31, 2013 and 2012, respectively, on the Company's net assets in the Barnett Shale field. See Note D for additional information regarding the noncash impairment charges.

As of December 31, 2013, the carrying values of the Company's ownership in Pioneer Alaska, the Barnett Shale field and Sendero were included in assets and liabilities held for sale in the accompanying consolidated balance sheet and were comprised of the following (the Company had no assets held for sale as of December 31, 2012):

	December 31, 2013
	(in thousands)
Composition of assets included in assets held for sale:
Current assets (excluding cash and cash equivalents)	$	57,602
Property, plant and equipment	526,148
Total assets	$	583,750
Composition of liabilities included in liabilities held for sale:
Current liabilities	$	28,771
Other liabilities	9,791
Total liabilities	$	38,562

86

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2013, 2012, and 2011

NOTE D.    Fair Value Measurements

Fair value is defined as the price that would be received to sell an asset or the price paid to transfer a liability in an orderly transaction between market participants at the measurement date. Fair value measurements are based upon inputs that market participants use in pricing an asset or liability, which are characterized according to a hierarchy that prioritizes those inputs based on the degree to which they are observable. Observable inputs represent market data obtained from independent sources, whereas unobservable inputs reflect a company's own market assumptions, which are used if observable inputs are not reasonably available without undue cost and effort. The three input levels of the fair value hierarchy are as follows:

• Level 1 – quoted prices for identical assets or liabilities in active markets.

• Level 2 – quoted prices for similar assets or liabilities in active markets; quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability (e.g. interest rates) and inputs derived principally from or corroborated by observable market data by correlation or other means.

• Level 3 – unobservable inputs for the asset or liability.

Assets and liabilities measured at fair value on a recurring basis. The fair value input hierarchy level to which an asset or liability measurement in its entirety falls is determined based on the lowest level input that is significant to the measurement in its entirety.

The following tables present the Company's assets and liabilities that are measured at fair value on a recurring basis as of December 31, 2013 and 2012 for each of the fair value hierarchy levels:

	Fair Value Measurements at the End of the Reporting Period Using
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Fair Value at December 31, 2013
	(in thousands)
Assets:
Trading securities	$	136	$	146	$	—	$	282
Commodity derivatives	—		156,561		—		156,561
Interest rate derivatives	—		9,530		—		9,530
Deferred compensation plan assets	63,971		—		—		63,971
Total assets	64,107		166,237		—		230,344
Liabilities:
Commodity derivatives	—		11,626		—		11,626
Interest rate derivatives	—		9,933		—		9,933
Total liabilities	—		21,559		—		21,559
Total recurring fair value measurements	$	64,107	$	144,678	$	—	$	208,785

87

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2013, 2012, and 2011

	Fair Value Measurements at the End of the Reporting Period Using
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Fair Value at December 31, 2012
	(in thousands)
Assets:
Trading securities	$	124	$	154	$	—	$	278
Commodity derivatives	—		334,376		—		334,376
Deferred compensation plan assets	49,685		—		—		49,685
Total assets	49,809		334,530		—		384,339
Liabilities:
Commodity derivatives	—		15,999		—		15,999
Interest rate derivatives	—		9,724		—		9,724
Total liabilities	—		25,723		—		25,723
Total recurring fair value measurements	$	49,809	$	308,807	$	—	$	358,616

Trading securities and deferred compensation plan assets. The Company's trading securities are comprised of securities that are both actively traded and not actively traded on major exchanges. The Company's deferred compensation plan assets represent investments in equity and mutual fund securities that are actively traded on major exchanges. These investments are measured based on observable prices on major exchanges. As of December 31, 2013 and 2012, substantially all of the significant inputs to these asset exchange values represented Level 1 independent active exchange market price inputs. Inputs for certain trading securities that are not actively traded on major exchanges were classified as Level 2 inputs.

Commodity derivatives.The Company's commodity derivatives represent oil, NGL and gas swap contracts, collar contracts and collar contracts with short puts. The Company's asset and liability measurements for its oil, NGL and gas swap, collar and collar contracts with short puts represent Level 2 inputs in the hierarchy priority. The Company utilizes discounted cash flow and option-pricing models for valuing its commodity derivatives.

The asset and liability values attributable to the Company's commodity derivatives were determined based on inputs which include (i) the contracted notional volumes, (ii) independent active market price quotes, (iii) the applicable estimated credit-adjusted risk-free rate yield curve and (iv) the implied rate of volatility inherent in the collar and collar contracts with short puts, which is based on active and independent market-quoted volatility factors.

Interest rate derivatives. The Company's interest rate derivative assets and liabilities as of December 31, 2013 and 2012 represent interest rate swap contracts. The Company utilizes discounted cash flow models for valuing its interest rate derivatives. The net derivative values attributable to the Company's interest rate derivative contracts as of December 31, 2013 and 2012 are based on (i) the contracted notional amounts, (ii) LIBOR rate yield curves provided by counterparties and corroborated with forward active market-quoted LIBOR yield curves and (iii) the applicable credit-adjusted risk-free rate yield curve. The Company's interest rate derivative liability measurements represent Level 2 inputs in the hierarchy priority.

Assets and liabilities measured at fair value on a nonrecurring basis. Certain assets are measured at fair value on a nonrecurring basis. These assets are not measured at fair value on any ongoing basis, but are subject to fair value adjustments in certain circumstances. These assets can include long-lived assets that have been reduced to fair value when they are held for sale, inventory and proved and unproved oil and gas properties that are written down to fair value when they are impaired.

Proved oil and gas properties. During 2013, 2012 and 2011, reductions in management's longer-term commodity price outlooks ("Management's Price Outlooks") provided indications of possible impairment of the Company's predominately dry gas properties in the Raton field in southeastern Colorado, the Barnett Shale field in North Texas and the Edwards Trend and Austin Chalk fields in South Texas. As a result of management's assessments, during the years ended December 31, 2013, 2012 and 2011, the Company recognized impairment charges to reduce the carrying values of the Raton field, the Barnett Shale field and the Edwards Trend/Austin Chalk fields, respectively, to their estimated fair values. The impairment charge associated with the Barnett Shale field is reported in income (loss) from discontinued operations, net of tax in the accompanying consolidated statements of operations.

88

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2013, 2012, and 2011

The Company calculated the fair values of the Raton field, the Barnett Shale field and the Edwards Trend/Austin Chalk fields proved properties using a discounted cash flow model. Significant Level 3 assumptions associated with the calculation of discounted future cash flows included Management's Price Outlooks and management's outlooks for (i) production costs, (ii) capital expenditures, (iii) production and (iv) estimated proved reserves and risk-adjusted probable reserves. Management's Price Outlooks are developed based on third-party longer-term commodity futures price outlooks as of each measurement date. The expected future net cash flows were discounted using an annual rate of 10 percent to determine fair value.

The following table presents the fair value and fair value adjustments (in millions) for the Company's 2013, 2012 and 2011 proved property impairments, as well as the average oil price per barrel ("BBL") and gas price per British thermal unit ("MMBTU") utilized in respective Management's Price Outlooks:

	Year ended	Fair		Fair Value			Management's Price Outlooks
	December 31,	Value		Adjustment			Oil		Gas
Edwards Trend/Austin Chalk	2011	$	189.9	$	(354.4	)	$	92.69	$	5.14
Barnett Shale	2012	$	184.8	$	(532.6	)	$	87.09	$	4.78
Raton	2013	$	533.6	$	(1,495.2	)	$	80.40	$	4.43

It is reasonably possible that the estimate of undiscounted future net cash flows attributable to these or other properties may change in the future resulting in the need to impair their carrying values. The primary factors that may affect estimates of future cash flows are (i) future adjustments, both positive and negative, to proved and appropriate risk-adjusted probable and possible oil and gas reserves, (ii) results of future drilling activities, (iii) Management's Price Outlooks and (iv) increases or decreases in production and capital costs associated with these fields.

Assets classified as held for sale. The Company records assets classified as held for sale at the lower of the asset's carrying amount or estimated fair value less costs to sell. The fair value of Pioneer Alaska is based on an estimated sale price based on ongoing negotiations, less costs to sell, and is further supported by the Company's discounted cash flow model for the Alaska proved properties using Level 3 inputs as discussed in the proved oil and gas properties section above. The fair value of the Barnett Shale field assets is based upon a weighted average calculation that uses management inputs including an estimated sales price and a discounted cash flow model for the proved properties using Level 3 assumptions as discussed in the proved oil and gas properties section above. The fair value of the Sendero assets are based upon anticipated sales proceeds less costs to sell, which represent a Level 3 input in the hierarchy priority.  See Note C for additional information regarding the Company's planned divestitures.

The following table presents the estimated fair value less costs to sell and fair value adjustments for the Company's assets classified as held for sale as of December 31, 2013:

	Estimated Fair Value Less Costs to Sell		Fair Value Adjustment
	(in millions)
Discontinued operations held for sale - Alaska	$	350.6	$	(539.8	)
Discontinued operations held for sale - Barnett Shale field	$	180.4	$	(189.5	)
Other long-lived assets held for sale - Sendero	$	31.4	$	(25.5	)

Unproved oil and gas properties. During December 2012, the Company recorded an impairment charge to reduce the carrying value of unproved properties in the Barnett Shale field of $71.8 million (reported in income (loss) from discontinued operations, net of tax in the accompanying consolidated statements of operations). The Company calculated the estimated fair value of the Barnett Shale unproved properties using significant Level 3 assumptions based on average lease bonuses per acre for its Barnett liquid-rich acreage, allocating no value to dry gas acreage as the Company does not intend to develop that acreage.

Inventories. During December 2013, the Company recorded an impairment charge of $23.2 million to reduce the carrying value of its excess vertical well pipe inventory. The Company calculated the estimated fair value of the inventory using significant

89

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2013, 2012, and 2011

Level 2 assumptions based on third-party price quotes for the asset in an active market. The impairment charge is included in other expense on the Company's accompanying consolidated statements of operations.

Financial instruments not carried at fair value. Carrying values and fair values of financial instruments that are not carried at fair value in the consolidated balance sheet as of December 31, 2013 and 2012 are as follows:

	December 31, 2013				December 31, 2012
	Carrying Value		Fair Value		Carrying Value		Fair Value
	(in thousands)
Long-term debt	$	2,653,059	$	3,018,830	$	3,721,193	$	4,555,770

Long-term debt includes the Company's credit facility and the Company's senior notes. At December 31, 2012, long-term debt also included Pioneer Southwest's credit facility and the Company's 2.875% Convertible Senior Notes due 2038 ("Convertible Senior Notes"), which were both fully extinguished during 2013. The fair value of debt is determined utilizing inputs that are Level 2 measurements in the fair value hierarchy.

Credit facilities. The fair values of the Company's and, through the date of the merger, Pioneer Southwest's credit facilities are calculated using a discounted cash flow model based on (i) forecasted contractual interest and fee payments, (ii) forward active market-quoted United States Treasury Bill rate (in the case of the Company's credit facility) or LIBOR (in the case of Pioneer Southwest's credit facility) yield curves and (iii) the applicable credit-adjustments.

Senior notes. The Company's senior notes represent debt securities that are not actively traded on major exchanges. The fair values of the Company's senior notes are based on their periodic values as quoted on the major exchanges.

The Company has other financial instruments consisting primarily of cash equivalents, receivables, prepaid expenses, payables and other current assets and liabilities that approximate fair value due to the nature of the instrument and relatively short maturities. Non-financial assets and liabilities initially measured at fair value include certain assets acquired and liabilities assumed in a business combination, goodwill and asset retirement obligations.

Concentrations of credit risk. As of December 31, 2013, the Company's primary concentration of credit risks are the risks of collecting accounts receivable – trade and the risk of counterparties' failure to perform under derivative obligations. See Note L for information regarding the Company's major customers.

The Company has entered into International Swap Dealers Association Master Agreements ("ISDA Agreements") with each of its derivative counterparties. The terms of the ISDA Agreements provide the Company and the counterparties with rights of set off upon the occurrence of defined acts of default by either the Company or a counterparty to a derivative, whereby the party not in default may set off all derivative liabilities owed to the defaulting party against all derivative asset receivables from the defaulting party. See Note E for additional information regarding the Company's derivative activities and information regarding derivative net assets and liabilities by counterparty.

NOTE E.     Derivative Financial Instruments

The Company utilizes commodity swap contracts, collar contracts and collar contracts with short puts to (i) reduce the effect of price volatility on the commodities the Company produces and sells or consumes, (ii) support the Company's annual capital budgeting and expenditure plans and (iii) reduce commodity price risk associated with certain capital projects. The Company also, from time to time, utilizes interest rate contracts to reduce the effect of interest rate volatility on the Company's indebtedness.

90

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2013, 2012, and 2011

Oil production derivative activities. All material physical sales contracts governing the Company's oil production are tied directly to, or are highly correlated with, New York Mercantile Exchange ("NYMEX") West Texas Intermediate ("WTI") oil prices. The Company uses derivative contracts to manage oil price volatility and basis swap contracts to reduce basis risk between NYMEX prices and actual index prices at which the oil is sold.

The following table sets forth the volumes per day in BBLs associated with the Company's outstanding oil derivative contracts as of December 31, 2013 and the weighted average oil prices per BBL for those contracts:

	2014		2015		2016
Swap contracts:
Volume (BBLs)	10,000		—		—
Average price per BBL	$	93.87	$	—	$	—
Collar contracts with short puts:
Volume (BBLs)	69,000		85,000		25,000
Average price per BBL:
Ceiling	$	114.05	$	98.98	$	93.30
Floor	$	93.70	$	88.06	$	85.00
Short put	$	77.61	$	73.06	$	70.00

Subsequent to December 31, 2013, the Company entered into rollfactor swap contracts for 5,000 BBLs per day of the Company's March through December 2014 production with a NYMEX roll price of $0.82 per BBL and 5,000 BBLs per day of the Company's 2015 production with a NYMEX roll price of $0.60 per BBL. Rollfactor swap contracts fix the difference between (i) each day's price per BBL of WTI for the first nearby month less (ii) the price per BBL of WTI for the second nearby NYMEX month, multiplied by .6667; plus (iii) each day's price per BBL of WTI for the first nearby month less (iv) the price per BBL of WTI for the third nearby NYMEX month, multiplied by .3333.

NGL production derivative activities. All material physical sales contracts governing the Company's NGL production are tied directly or indirectly to either Mont Belvieu or Conway fractionation facilities' NGL component product posted prices. The Company uses derivative contracts to manage the NGL component product price volatility.

As of December 31, 2013, the Company had natural gasoline collar contracts with short put derivatives for 1,000 BBLs per day of 2014 production with a ceiling price of $109.50 per BBL, a floor price of $95.00 per BBL and short put price of $80.00 per BBL; and ethane collar contracts for 3,000 BBLs per day of 2014 production with a ceiling price of $13.72 per BBL and a floor price of $10.78 per BBL.

Subsequent to December 31, 2013, the Company entered into propane swap contracts for 1,000 BBLs per day of March through December 2014 production with a price of $47.57 per BBL and 2,000 BBLs per day of April through October 2014 production with a price of $48.51 per BBL.

Gas production derivative activities. All material physical sales contracts governing the Company's gas production are tied directly or indirectly to NYMEX Henry Hub ("HH") gas prices or regional index prices where the gas is sold. The Company uses derivative contracts to manage gas price volatility and basis swap contracts to reduce basis risk between HH prices and actual index prices at which the gas is sold.

91

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2013, 2012, and 2011

The following table sets forth the volumes per day in MMBTUs associated with the Company's outstanding gas derivative contracts as of December 31, 2013 and the weighted average gas prices per MMBTU for those contracts:

	2014			2015			2016
Swap contracts:
Volume (MMBTUs)	195,000			20,000			—
Price per MMBTU	$	4.04		$	4.31		$	—
Collar contracts with short puts:
Volume (MMBTUs)	115,000			285,000			20,000
Price per MMBTU:
Ceiling	$	4.70		$	5.07		$	5.36
Floor	$	4.00		$	4.00		$	4.00
Short put	$	3.00		$	3.00		$	3.00
Basis swap contracts:
Volume (MMBTUs) (a)	85,082			30,000			—
Price per MMBTU	$	(0.20	)	$	(0.18	)	$	—

_________________

(a) Subsequent to December 31, 2013, the Company entered into additional basis swap contracts for 35,000 MMBTU per day of April through December 2014 production with a negative price differential of $0.27 per MMBTU between the relevant index price and the NYMEX price.

Marketing and basis transfer derivatives. Periodically, the Company enters into buy and sell marketing arrangements to fulfill firm pipeline transportation commitments. Associated with these marketing arrangements, the Company may enter into index swaps to mitigate price risk. As of December 31, 2013, the Company had no open marketing derivative positions. Subsequent to December 31, 2013, the Company entered into marketing gas index swap contracts for 20,000 MMBTU per day of March 2014 volumes with a price differential of $0.34 per MMBTU, 10,000 MMBTU per day of April through October 2014 volumes with a price differential of $0.36 per MMBTU and 30,000 MMBTU per day of April through December 2014 volumes with a price differential of $0.30 per MMBTU.

Interest rates. During the second quarter of 2013, the Company terminated its interest rate derivative contracts that locked in a fixed forward annual interest rate of 3.21 percent, for a 10-year period ending in December 2025, on a notional amount of $250 million and received cash proceeds of $482 thousand.

As of December 31, 2013, the Company was a party to interest rate derivative contracts whereby the Company will receive a fixed interest rate of 3.95 percent in exchange for paying a floating interest rate comprised of the three-month LIBOR plus an average rate of 1.11 percent on a notional amount of $400 million through July 15, 2022.

Tabular disclosure of derivative financial instruments. All of the Company's derivatives are accounted for as non-hedge derivatives as of December 31, 2013 and December 31, 2012 and therefore all changes in the fair values of its derivative contracts are recognized as gains or losses in the earnings of the periods in which they occur. The Company classifies the fair value amounts of derivative assets and liabilities as net current or noncurrent derivative assets or net current or noncurrent derivative liabilities, whichever the case may be, by commodity and counterparty. The Company enters into derivatives under master netting arrangements, which, in an event of default, allows the Company to offset payables to and receivables from the defaulting counterparty.

92

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2013, 2012, and 2011

The aggregate fair value of the Company's derivative instruments reported in the consolidated balance sheets by type and counterparty, including the classification between current and noncurrent assets and liabilities, consists of the following:

Fair Value of Derivative Instruments as of December 31, 2013
Type	Consolidated Balance Sheet Location	Fair Value		Gross Amounts Offset in the Consolidated Balance Sheet			Net Fair Value Presented in the Consolidated Balance Sheet
		(in thousands)
Derivatives not designated as hedging instruments
Asset Derivatives:
Commodity price derivatives	Derivatives - current	$	73,431	$	(7,724	)	$	65,707
Interest rate derivatives	Derivatives - current	$	9,530	$	—		$	9,530
Commodity price derivatives	Derivatives - noncurrent	$	95,358	$	(4,504	)	90,854
Interest rate derivatives	Derivatives - noncurrent	$	15,493	$	(15,493	)	$	—
							$	166,091
Liability Derivatives:
Commodity price derivatives	Derivatives - current	$	19,350	$	(7,724	)	$	11,626
Commodity price derivatives	Derivatives - noncurrent	$	4,504	$	(4,504	)	—
Interest rate derivatives	Derivatives - noncurrent	$	25,426	$	(15,493	)	$	9,933
							$	21,559

Fair Value of Derivative Instruments as of December 31, 2012
Type	Consolidated Balance Sheet Location	Fair Value		Gross Amounts Offset in the Consolidated Balance Sheet			Net Fair Value Presented in the Consolidated Balance Sheet
		(in thousands)
Derivatives not designated as hedging instruments
Asset Derivatives:
Commodity price derivatives	Derivatives - current	$	286,805	$	(7,686	)	$	279,119
Commodity price derivatives	Derivatives - noncurrent	$	61,618	$	(6,361	)	55,257
							$	334,376
Liability Derivatives:
Commodity price derivatives	Derivatives - current	$	21,102	$	(7,686	)	$	13,416
Commodity price derivatives	Derivatives - noncurrent	$	8,944	$	(6,361	)	2,583
Interest rate derivatives	Derivatives - noncurrent	$	9,724	$	—		9,724
							$	25,723

The following table details the location of gains and losses reclassified from AOCI-Hedging into earnings on the Company's discontinued cash flow hedging contracts in the accompanying consolidated statements of operations:

Derivatives in Cash Flow Hedging Relationships	Location of Gain/(Loss) Reclassified from AOCI into Earnings	Amount of Gain/(Loss) Reclassified from AOCI into Earnings
		Year Ended December 31,
		2013		2012			2011
		(in thousands)
Interest rate derivatives	Interest expense	$	—	$	(1,699	)	$	(282	)
Commodity price derivatives	Oil and gas revenue	—		(3,156		)	32,918
Total		$	—	$	(4,855	)	$	32,636

93

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2013, 2012, and 2011

The following table details the location of gains and losses recognized on the Company's derivative contracts in the accompanying consolidated statements of operations:

Derivatives Not Designated as Hedging Instruments	Location of Gain (Loss) Recognized in Earnings on Derivatives	Amount of Gain (Loss) Recognized in Earnings on Derivatives
		Year Ended December 31,
		2013			2012			2011
		(in thousands)
Interest rate derivatives	Derivative gains, net	$	9,803		$	(22,428	)	$	3,098
Commodity price derivatives	Derivative gains, net	(5,793		)	352,679			389,654
Total		$	4,010		$	330,251		$	392,752

Derivative counterparties. The Company uses credit and other financial criteria to evaluate the credit standing of, and to select, counterparties to its derivative instruments. Although the Company does not obtain collateral or otherwise secure the fair value of its derivative instruments, associated credit risk is mitigated by the Company's credit risk policies and procedures.

The following table provides the Company's net derivative assets or liabilities by counterparty as of December 31, 2013:

	Net Assets (Liabilities)
	(in thousands)
JP Morgan Chase	$	46,908
Morgan Stanley	17,411
Merrill Lynch	16,979
Barclays Capital	16,923
Den Norske Bank	8,928
Societe Generale	8,754
Macquarie Bank	8,146
J. Aron & Company	6,817
Wells Fargo Bank, N.A.	4,969
Citibank, N.A.	4,857
Deutsche Bank	1,374
BMO Financial Group	1,041
Credit Suisse	992
BP Corporation North America	793
Royal Bank of Canada	752
BNP Paribas	473
Toronto Dominion	(476		)
Mitsubishi UFJ Financial Group	(504		)
Credit Agricole	(605		)
Total	$	144,532

NOTE F.    Exploratory Well Costs

The Company capitalizes exploratory well and project costs until a determination is made that the well or project has either found proved reserves, is impaired or is sold. The Company's capitalized exploratory well and project costs are presented in proved properties in the accompanying consolidated balance sheets. If the exploratory well or project is determined to be impaired, the impaired costs are charged to exploration and abandonments expense.

94

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2013, 2012, and 2011

The following table reflects the Company's capitalized exploratory well and project activity during each of the years ended December 31, 2013, 2012 and 2011:

	Year Ended December 31,
	2013			2012			2011
	(in thousands)
Beginning capitalized exploratory well costs	$	212,670		$	107,596		$	96,193
Additions to exploratory well costs pending the determination of proved reserves	1,219,797			926,084			524,313
Reclassification due to determination of proved reserves	(1,044,815		)	(790,373		)	(480,716		)
Disposition of assets sold	(92,855		)	—			(28,938		)
Impairment of properties	(86,761		)	—			—
Exploratory well costs charged to exploration and abandonment expense (a)	(49,134		)	(30,637		)	(3,256		)
Ending capitalized exploratory well costs (b)	$	158,902		$	212,670		$	107,596

 _______________

(a) Includes exploration and abandonment expense reclassified as discontinued operations of $43.3 million, $21.6 million, and $180 thousand in 2013, 2012 and 2011, respectively.

(b) Includes $60.3 million of capitalized exploratory well costs classified as held for sale in the accompanying consolidated balance sheet as of December 31, 2013.

The following table provides an aging, as of December 31, 2013, 2012 and 2011 of capitalized exploratory costs and the number of projects for which exploratory well costs have been capitalized for a period greater than one year, based on the date drilling was completed:

	Year Ended December 31,
	2013		2012		2011
	(in thousands, except well counts)
Capitalized exploratory well costs that have been suspended:
One year or less	$	115,955	$	190,678	$	107,596
More than one year	42,947		21,992		—
	$	158,902	$	212,670	$	107,596
Number of projects with exploratory well costs that have been suspended for a period greater than one year	1		1		—

Alaska - Nuna. The Company's Nuna project, which has $42.9 million of suspended project costs as of December 31, 2013, includes the Nuna-1 exploration well that was drilled during 2012 to test the Torok formation and a second appraisal well that was drilled and logged during the first quarter of 2013. The Company flow-tested the Nuna-1 well during the second quarter of 2012 and again in the first quarter of 2013. The second appraisal well encountered a mechanical problem and could not be flow-tested before the end of the winter drilling season. The results of the flow tests on the Nuna-1 well and the log data from the second Nuna well are both very encouraging. The Company is currently conducting a front-end engineering design study to evaluate the potential for onshore production facilities to support the project. The capitalized exploratory well costs associated with the Nuna project are classified as held for sale in the accompanying consolidated balance sheet as of December 31, 2013.

Alaska - Oooguruk.As of December 31, 2012, the Company had $22.0 million of suspended well costs recorded for the K-13 well in the Alaska Oooguruk field. Drilling on the K-13 well was completed during September 2011. During well completion operations, subsurface damages were sustained. The Company performed repairs to correct a subsurface safety valve and a tubing leak in the third quarter of 2013. These repairs enabled a production test in the fourth quarter of 2013, which had negative results.  Based on the negative production test results, the Company has discontinued any future plans to complete and produce the well. Accordingly, an exploration and abandonment charge of $33.7 million was recorded in the fourth quarter of 2013 to write off the K-13 well's carrying value, which is included in loss from discontinued operations, net of tax in the accompanying consolidated statements of operations.

95

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2013, 2012, and 2011

NOTE G.     Long-term Debt and Interest Expense

Long-term debt, including the effects of issuance discounts and net deferred fair value hedge losses, consisted of the following components at December 31, 2013 and 2012:

	December 31,
	2013			2012
	(in thousands)
Outstanding debt principal balances:
Pioneer credit facility	$	—		$	474,000
Pioneer Southwest credit facility	—			126,000
5.875% senior notes due 2016	455,385			455,385
6.65% senior notes due 2017	485,100			485,100
6.875 % senior notes due 2018	449,500			449,500
7.500 % senior notes due 2020	450,000			450,000
3.95% senior notes due 2022	600,000			600,000
7.20% senior notes due 2028	250,000			250,000
2.875% convertible senior notes due 2038	—			479,907
	2,689,985			3,769,892
Issuance discounts	(35,885		)	(47,309		)
Net deferred fair value hedge losses	(1,041		)	(1,390		)
Total long-term debt	$	2,653,059		$	3,721,193

Credit Facility. During December 2012, the Company entered into the First Amendment to the Second Amended and Restated 5-Year Revolving Credit Agreement (the "Credit Facility") with a syndicate of financial institutions that extended the maturity to December 20, 2017 and increased the aggregate loan commitments to $1.5 billion. As of December 31, 2013, the Company had no outstanding borrowings under the Credit Facility.

Borrowings under the Credit Facility may be in the form of revolving loans or swing line loans. Aggregate outstanding swing line loans may not exceed $150 million. Revolving loans under the Credit Facility bear interest, at the option of the Company, based on (a) a rate per annum equal to the higher of the prime rate announced from time to time by Wells Fargo Bank, National Association or the weighted average of the rates on overnight Federal funds transactions with members of the Federal Reserve System during the last preceding business day plus 0.5 percent plus a defined alternate base rate spread margin, which is currently 0.5 percent based on the Company's debt rating or (b) a base Eurodollar rate, substantially equal to LIBOR, plus a margin (the "Applicable Margin"), which is currently 1.50 percent and is also determined by the Company's debt rating. Swing line loans under the Credit Facility bear interest at a rate per annum equal to the "ASK" rate for Federal funds periodically published by the Dow Jones Market Service plus the Applicable Margin. Letters of credit outstanding under the Credit Facility are subject to a per annum fee, representing the Applicable Margin plus 0.125 percent. The Company also pays commitment fees on undrawn amounts under the Credit Facility that are determined by the Company's debt rating (currently 0.25 percent). Borrowings under the Credit Facility are general unsecured obligations.

The Credit Facility requires the maintenance of a ratio of total debt to book capitalization, subject to certain adjustments, not to exceed .60 to 1.0. As of December 31, 2013, the Company was in compliance with all of its debt covenants.

Upon completion of the Pioneer Southwest merger, the Company repaid the outstanding indebtedness and terminated the Pioneer Southwest $300 million Amended and Restated 5-Year Revolving Credit Agreement ("the "Pioneer Southwest Credit Facility"). Associated therewith, the Company charged $861 thousand of unamortized deferred financing fees related to the Pioneer Southwest Credit Facility to other expense in the accompanying consolidated statements of operations.

Senior notes. During June 2012, the Company issued $600 million of 3.95% Senior Notes due 2022 and received proceeds, net of $8.5 million of offering discounts and costs, of $591.5 million. The Company used the net proceeds from the issuance to reduce outstanding borrowings under the Credit Facility.

96

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2013, 2012, and 2011

The Company's senior notes are general unsecured obligations ranking equally in right of payment with all other senior unsecured indebtedness of the Company and are senior in right of payment to all existing and future subordinated indebtedness of the Company. The Company is a holding company that conducts all of its operations through subsidiaries; consequently, the senior notes are structurally subordinated to all obligations of its subsidiaries. Interest on the Company's senior notes is payable semiannually.

Convertible senior notes. As of December 31, 2012, the Company had $479.9 million of Convertible Senior Notes outstanding. During December 2012 and March 2013, the Company's stock price met the price threshold that caused the Convertible Senior Notes to be convertible during the six months ended June 30, 2013 at the option of the holders into a combination of cash and the Company's common stock based on a formula set forth in the indenture supplement pursuant to which the Convertible Senior Notes were issued. In addition, on April 15, 2013, the Company announced that it would exercise its option to redeem all Convertible Senior Notes that had not been converted by the holders before May 16, 2013. Associated therewith, during the six months ended June 30, 2013, holders of $479.1 million principal amount of the Convertible Senior Notes exercised their right to convert their Convertible Senior Notes into cash and shares of the Company's common stock. The Company paid the tendering holders $479.1 million of cash and issued to the tendering holders 4.4 million shares of the Company's common stock during the six months ended June 30, 2013, in accordance with the terms of the Convertible Senior Notes indenture agreement. On May 16, 2013, the Company paid $845 thousand in principal and interest to redeem all Convertible Senior Notes that remained outstanding.

For the years ended December 31, 2013, 2012 and 2011, the Company recorded $9.4 million, $33.5 million and $32.3 million, respectively, of interest expense relating to the Convertible Senior Notes, which had an effective interest rate of 6.75 percent.

Principal maturities. Principal maturities of long-term debt at December 31, 2013, are as follows (in thousands):

2014	$	—
2015	$	—
2016	$	455,385
2017	$	485,100
2018	$	449,500
Thereafter	$	1,300,000

Interest expense. The following amounts have been incurred and charged to interest expense for the years ended December 31, 2013, 2012 and 2011:

	Year Ended December 31,
	2013			2012			2011
	(in thousands)
Cash payments for interest	$	182,126		$	168,665		$	165,251
Amortization of issuance discounts	11,423			27,351			25,210
Amortization of net deferred hedge losses (a)	349			2,018			573
Accretion of discount on postretirement benefit obligations	193			257			315
Amortization of capitalized loan fees	5,260			5,937			5,385
Net changes in accruals	(5,709		)	10,842			(1,768		)
Interest incurred	193,642			215,070			194,966
Less capitalized interest	(9,892		)	(10,848		)	(13,362		)
Total interest expense	$	183,750		$	204,222		$	181,604

_______________

(a) Includes interest rate derivative hedges of $1.7 million and $282 thousand for the periods ended December 31, 2012 and 2011, respectively, that were reclassified from AOCI - Hedging into earnings upon expiration (see Note E).

97

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2013, 2012, and 2011

NOTE H.     Incentive Plans

Retirement Plans

Deferred compensation retirement plan. In August 1997, the Compensation Committee of the Company's board of directors (the "Board") approved a deferred compensation retirement plan for the officers and certain key employees of the Company. Each officer and key employee is allowed to contribute up to 25 percent of their base salary and 100 percent of their annual bonus. The Company will provide a matching contribution of 100 percent of the officer's and key employee's contribution limited to the first ten percent of the officer's base salary and eight percent of the key employee's base salary. The Company's matching contribution vests immediately. A trust fund has been established by the Company to accumulate the contributions made under this retirement plan. The Company's matching contributions were $2.7 million, $2.4 million and $2.2 million for the years ended December 31, 2013, 2012 and 2011, respectively.

401(k) plan. The Pioneer Natural Resources USA, Inc. ("Pioneer USA," a wholly-owned subsidiary of the Company) 401(k) and Matching Plan (the "401(k) Plan") is a defined contribution plan established under the Internal Revenue Code Section 401. All regular full-time and part-time employees of Pioneer USA are eligible to participate in the 401(k) Plan on the first day of the month following their date of hire. Participants may contribute an amount up to 80 percent of their annual salary into the 401(k) Plan. Matching contributions are made to the 401(k) Plan in cash by Pioneer USA in amounts equal to 200 percent of a participant's contributions to the 401(k) Plan that are not in excess of five percent of the participant's base compensation (the "Matching Contribution"). Each participant's account is credited with the participant's contributions, Matching Contributions and allocations of the 401(k) Plan's earnings. Participants are fully vested in their account balances except for Matching Contributions and their proportionate share of 401(k) Plan earnings attributable to Matching Contributions, which proportionately vest over a four-year period that begins with the participant's date of hire. During the years ended December 31, 2013, 2012 and 2011, the Company recognized compensation expense of $29.7 million, $24.7 million and $18.3 million, respectively, as a result of Matching Contributions.

Stock-based compensation costs. In accordance with GAAP, the Company records stock-based compensation expense, equal to the fair value of share-based payments, ratably over the vesting periods of the Long-Term Incentive Plan ("LTIP") awards, the Pioneer Southwest Long-Term Incentive Plan ("Pioneer Southwest LTIP") awards, the Series B unit awards issued by Sendero and for payments associated with the Company's Employee Stock Purchase Plan ("ESPP").

The following table reflects stock-based compensation expense recorded for each type of incentive award and the associated income tax benefit for the years ended December 31, 2013, 2012 and 2011:

	Year Ended December 31,
	2013		2012		2011
	(in thousands)
Restricted stock-equity awards	$	56,165	$	48,876	$	32,861
Restricted stock-Liability Awards	40,404		22,419		10,882
Stock options (a)	2,952		4,110		2,936
Performance unit awards	9,131		6,162		4,500
Pioneer Southwest LTIP	1,029		1,098		761
Sendero Series B units	1,020		982		1,020
ESPP	1,731		2,437		125
Total	$	112,432	$	86,084	$	53,085
Income tax benefit	$	36,298	$	27,901	$	22,084

 _____________________

(a) Cash proceeds received from stock option exercises during 2013, 2012 and 2011 amounted to $5.0 million, $3.1 million and $619 thousand, respectively.

As of December 31, 2013, there was $146.3 million of unrecognized stock-based compensation expense related to unvested share-based compensation plans, including $44.8 million attributable to Liability Awards. The stock-based compensation expense

98

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2013, 2012, and 2011

will be recognized on a straight-line basis over the remaining vesting periods of the awards, which is a period of less than three years on a weighted average basis.

Pioneer Long-Term Incentive Plan

In May 2006, the Company's stockholders approved the LTIP, which provides for the granting of various forms of awards, including stock options, stock appreciation rights, performance units, restricted stock and restricted stock units to directors, officers and employees of the Company. The LTIP provides for the issuance of 9.1 million shares pursuant to awards under the plan. The shares to be delivered under the LTIP shall be made available from (i) authorized but unissued shares, (ii) shares held as treasury stock or (iii) previously issued shares reacquired by the Company, including shares purchased on the open market.

The following table shows the number of shares available for issuance pursuant to awards under the Company's LTIP at December 31, 2013:

Approved and authorized awards	9,100,000
Awards issued after May 3, 2006	(6,506,571	)
Awards available for future grant	2,593,429

Restricted stock awards. During 2013, the Company awarded 683,952 restricted shares or units of the Company's common stock as compensation to directors, officers and employees of the Company (including 250,641 shares or units representing Liability Awards). The Company's issued shares, as reflected in the consolidated balance sheets as of December 31, 2013, do not include 197,340 of issued, but unvested shares awarded under stock-based compensation plans that have voting rights.

The following table reflects the restricted stock award activity for the year ended December 31, 2013:

	Equity Awards				Liability Awards
	Number of Shares		Weighted Average Grant- Date Fair Value		Number of Shares
Outstanding at beginning of year	1,512,762		$	96.22	405,916
Shares granted	433,311		$	134.58	250,641
Shares forfeited	(80,150	)	$	116.50	(35,813	)
Shares vested	(517,908	)	$	70.22	(198,362	)
Outstanding at end of year	1,348,015		$	117.09	422,382

The weighted average grant-date fair value of restricted stock equity awards awarded during 2013, 2012 and 2011 was $134.58, $113.02 and $97.52, respectively. The fair value of shares for which restrictions lapsed during 2013, 2012 and 2011 was $67.7 million, $137.2 million and $98.6 million, respectively, based on the market price on the vesting date.

As of December 31, 2013 and 2012, accounts payable – due to affiliates in the accompanying consolidated balance sheet includes $33.0 million and $18.8 million of liabilities attributable to the Liability Awards, representing the earned portion of the fair value of the outstanding awards as of that date. The fair value of shares for which restrictions lapsed during 2013, 2012 and 2011 was $26.1 million, $14.2 million and $6.7 million respectively, based on the market price on the vesting date.

Stock option awards. Certain employees may be granted options to purchase shares of the Company's common stock with an exercise price equal to the fair market value of Pioneer common stock on the date of grant. The fair value of stock option awards is determined using the Black-Scholes option-pricing model. Option awards have a ten-year contract life. The expected life of an option is estimated based on historical and expected exercise behavior. The volatility assumption was estimated based upon expectations of volatility over the life of the option as measured by historical volatility. The risk-free interest rate was based on the United States Treasury rate for a term commensurate with the expected life of the option. The dividend yield was based upon a seven-year average dividend yield.

99

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2013, 2012, and 2011

The Company did not grant any stock options during the year ended December 31, 2013. The Company used the following weighted-average assumptions to estimate the fair value of stock options granted during the years ended December 31, 2012 and 2011:

	2012		2011
Expected option life - years	7.0		7.0
Volatility	49.4	%	47.6	%
Risk-free interest rate	1.5	%	2.9	%
Dividend yield	0.4	%	0.4	%

A summary of the Company's nonstatutory stock option awards activity for the year ended December 31, 2013 is presented below:

	Number of Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Life	Aggregate Intrinsic Value
					(in years)	(in thousands)
Outstanding at beginning of year	467,486		$	59.63
Options expired and forfeited	(11,085	)	$	106.90
Options exercised	(166,474	)	$	29.88
Outstanding and expected to vest, at end of year	289,927		$	74.90	6.80	$	31,651
Exercisable at end of year	115,290		$	26.74	5.48	$	18,139

The weighted average grant-date fair value of options awarded during 2012 and 2011 was $56.29 and $49.61, respectively, using the Black-Scholes option-pricing model. The intrinsic value of options exercised during 2013, 2012 and 2011 was $20.5 million, $17.2 million and $1.5 million, respectively, based on the difference between the market price at the exercise date and the option exercise price.

Performance unit awards. During 2013, 2012 and 2011, the Company awarded performance units to certain of the Company's officers under the LTIP. The number of shares of common stock to be issued is determined by comparing the Company's total shareholder return to the total shareholder return of a predetermined group of peer companies over the performance period. The performance unit awards vest over a 34-month service period. The grant-date fair values per unit of the 2013, 2012 and 2011 performance unit awards are $189.23, $172.57 and $134.68, respectively, which amounts were determined using the Monte Carlo simulation method and are being recognized as stock-based compensation expense ratably over the performance period. The Monte Carlo simulation model utilizes multiple input variables that determine the probability of satisfying the market condition stipulated in the award grant and calculates the fair value of the award. Expected volatilities utilized in the model were estimated using a historical period consistent with the remaining performance period of approximately three years. The risk-free interest rate was based on the United States Treasury rate for a term commensurate with the expected life of the grant. The Company used the following assumptions to estimate the fair value of performance unit awards granted during 2013, 2012 and 2011:

	2013				2012				2011
Risk-free interest rate	0.40%				0.40%				1.32%
Range of volatilities	30.4	%	-	42.9%	33.6	%	-	49.0%	50.2	%	-	84.1%

100

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2013, 2012, and 2011

The following table summarizes the performance unit activity for the year ended December 31, 2013:

	Number of Units (a)		Weighted  Average Grant-Date Fair Value
Beginning performance unit awards	91,370		$	154.53
Units granted	94,917		$	189.23
Units forfeited	(10,842	)	$	172.02
Units vested (b)	(40,969	)	$	134.68
Ending performance unit awards	134,476		$	183.66

 _____________________

(a) These amounts reflect the number of performance units granted. The actual payout of shares may be between zero percent and 250 percent of the performance units granted depending upon the total shareholder return ranking of the Company compared to peer companies at the vesting date.

(b) On December 31, 2013, the service period lapsed on 40,969 of these performance unit awards. The lapsed units earned 2.5 shares for each vested award representing 102,424 aggregate shares of common stock issued on January 2, 2014.

The fair value of shares for which restrictions lapsed during 2013, 2012 and 2011 was $18.9 million, $18.8 million and $44.7 million, respectively, based on the market price on the vesting date.

Pioneer 2008 PSE Employee Long-Term Incentive Plan

In May 2008, the board of directors of the general partner (the "General Partner") of Pioneer Southwest adopted the Pioneer Southwest 2008 Long-Term Incentive Plan ("Pioneer Southwest LTIP"), which provides for the granting of various forms of unit-based awards. In connection with the Pioneer Southwest merger the Company has, effective as of December 17, 2013, assumed, adopted and amended the Pioneer Southwest LTIP, and has changed the name of such plan to the Pioneer 2008 PSE Employee Long-Term Incentive Plan ("PSE LTIP"), and has assumed all Pioneer Southwest obligations associated with the Pioneer Southwest LTIP existing prior to its assumption and adoption by the Company. The Pioneer Southwest LTIP limits the number of awards granted under the plan to 3.0 million common units of Pioneer Southwest. As of the date of the Pioneer Southwest merger, 2.9 million common units under the Pioneer Southwest LTIP were available to be awarded or remained outstanding (678,034 common shares of Pioneer based upon the Conversion Ratio) and are carried forward to the PSE LTIP. The only outstanding awards under the PSE LTIP at the time of the Pioneer Southwest merger and immediately prior to the assumption and adoption of the PSE LTIP by the Company were phantom units of Pioneer Southwest. All such outstanding phantom units were converted at the effective time of the Pioneer Southwest merger based on the Conversion Ratio into restricted stock units of the Company, subject to the vesting schedule determined by the grant under the Pioneer Southwest LTIP which is a three-year vesting period from the date of grant. The common shares of Pioneer to be delivered under the PSE LTIP shall be made available from (i) authorized but unissued shares, (ii) shares held as treasury stock or (iii) previously issued shares reacquired by the Company, including shares purchased on the open market.

The following table shows the number of Pioneer common shares available for issuance pursuant to awards under the PSE LTIP at December 31, 2013:

Awards approved and outstanding	678,034
Awards issued under the PSE LTIP (a)	(23,192	)
Awards available for future grant (b)	654,842

_____________________

(a) Shares that represent outstanding awards originally granted under the Pioneer Southwest LTIP that have been assumed and adopted by the Company in connection with, and that continue to be outstanding after, the Pioneer Southwest merger.

(b) Shares that have not been issued and are not subject to outstanding awards granted under the Pioneer Southwest LTIP.

101

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2013, 2012, and 2011

The board of directors of the General Partner awarded 7,496 restricted common Pioneer Southwest units (1,743 shares of Pioneer common stock based on the Conversion Ratio) in 2012, which vested in May 2013, and 6,812 units (1,584 shares of Pioneer common stock based on the Conversion Ratio) in 2011, which vested in May 2012, as compensation to non-employee directors of the General Partner under the Pioneer Southwest LTIP. There were no restricted common units awarded under the Pioneer Southwest LTIP during 2013 and no awards outstanding at December 31, 2013.

The following table summarizes the activity of phantom unit awards issued under the Pioneer Southwest LTIP during 2013, which were converted to restricted stock units of the Company under the PSE LTIP based upon the Conversion Ratio:

	Phantom Unit Awards
	Number of Awards (a)		Weighted Average Grant-Date Fair Value
Outstanding awards at beginning of year	23,865		$	117.94
Units granted	7,492		$	110.32
Lapse of restrictions	(8,165	)	$	97.81
Outstanding awards at end of year	23,192		$	122.55

_____________________

(a) Reflects the number of awards in Pioneer common stock after the Pioneer Southwest merger based upon the Conversion Ratio.

The weighted average grant-date fair value of Pioneer Southwest restricted common units awarded during 2012 and 2011 was $114.75 and $126.24, respectively, based upon the Conversion Ratio. The fair value of common units for which restrictions lapsed on the restricted common units during 2013, 2012 and 2011 was $200 thousand, $200 thousand and $342 thousand, respectively, based on the market price at the vesting date.

The weighted average grant-date fair value of Pioneer Southwest phantom units awarded during 2013, 2012 and 2011 was $110.32, $120.43 and $138.32, respectively, based upon the Conversion Ratio. The fair value of phantom units for which restrictions lapsed during 2013was $799 thousand.

Subsidiary Issuances of Unit-Based Compensation

During 2010, Sendero entered into restricted unit agreements with two key employees, granting 1,000 Series B units in Sendero. The Series B unit awards had a grant date fair value of $5.1 million, vest ratably over a five year service period and do not earn equity rights unless certain defined performance conditions are achieved by Sendero.

Employee Stock Purchase Plan

The Company has an ESPP that allows eligible employees to annually purchase the Company's common stock at a discounted price. Officers of the Company are not eligible to participate in the ESPP. Contributions to the ESPP are limited to 15 percent of an employee's pay (subject to certain ESPP limits) during the eight-month offering period (January 1 to August 31). Participants in the ESPP purchase the Company's common stock at a price that is 15 percent below the closing sales price of the Company's common stock on either the first day or the last day of each offering period, whichever closing sales price is lower.

The following table shows the number of shares available for issuance under the ESPP at December 31, 2013:

Approved and authorized shares	1,250,000
Shares issued	(734,972	)
Shares available for future issuance	515,028

102

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2013, 2012, and 2011

Postretirement Benefit Obligations

At December 31, 2013 and 2012, the Company had $7.6 million and $9.7 million, respectively, of unfunded accumulated postretirement benefit obligations. These obligations are comprised of five unfunded plans, of which four relate to predecessor entities that the Company acquired in prior years, and two funded plans that the Company assumed sponsorship of in conjunction with the acquisition of Premier Silica. Other than the Company's retirement plan and the two legacy-Premier Silica plans, the participants of these plans are not current employees of the Company. The unfunded plans had no assets as of December 31, 2013 or 2012.

NOTE I.    Asset Retirement Obligations

The Company's asset retirement obligations primarily relate to the future plugging and abandonment of wells and related facilities. Market risk premiums associated with asset retirement obligations are estimated to represent a component of the Company's credit-adjusted risk-free rate that is utilized in the calculations of asset retirement obligations. The following table summarizes the Company's asset retirement obligation activity during the years ended December 31, 2013, 2012 and 2011:

	Year Ended December 31,
	2013			2012			2011
	(in thousands)
Beginning asset retirement obligations	$	197,754		$	136,742		$	152,291
Obligations assumed in acquisitions	—			10,498			6
New wells placed on production	5,775			9,593			9,233
Changes in estimates (a)	7,939			51,536			7,490
Obligations reclassified to liabilities held for sale	(10,091		)	—			(29,892		)
Disposition of wells	(6,083		)	(2,536		)	(448		)
Obligations settled	(13,953		)	(18,066		)	(12,880		)
Accretion of discount on continuing operations	11,862			8,677			7,506
Accretion of discount from integrated services (b)	14			100			—
Accretion of discount on discontinued operations	831			1,210			3,436
Ending asset retirement obligations	$	194,048		$	197,754		$	136,742

 _____________________

(a) The changes in the 2013, 2012 and 2011 estimates are primarily due to increases in abandonment cost estimates based on recent actual costs incurred to abandon wells and declines in credit-adjusted risk-free discount rates used to value increases in asset retirement obligations. The increases in 2013 and 2011 estimates were partially offset by higher commodity prices, which had the effect of lengthening the economic life of certain wells and decreasing the present value of future retirement obligations. The increase in the 2012 estimate was further impacted by declines in oil, NGL and gas prices used to calculate proved reserves, which had the effect of shortening the economic life of certain wells and increasing the present value of future retirement obligations.

(b) Accretion of discount from integrated services includes Premier Silica accretion expense, which is recorded as a reduction in income from vertical integration services in interest and other income in the Company's accompanying consolidated statements of operations. See Note M for more information about interest and other income.

As of December 31, 2013 and 2012, the current portions of the Company's asset retirement obligations were $19.3 million and $13.3 million, respectively.

NOTE J. Commitments and Contingencies

Severance agreements. The Company has entered into severance and change in control agreements with its officers and certain key employees. The current annual salaries for the officers and key employees covered under such agreements total $43.2 million.

Indemnifications. The Company has agreed to indemnify its directors and certain of its officers, employees and agents with respect to claims and damages arising from acts or omissions taken in such capacity, as well as with respect to certain litigation.

103

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2013, 2012, and 2011

Legal actions. The Company is party to various proceedings and claims incidental to its business. While many of these matters involve inherent uncertainty, the Company believes that the amount of the liability, if any, ultimately incurred with respect to such other proceedings and claims will not have a material adverse effect on the Company's consolidated financial position as a whole or on its liquidity, capital resources or future annual results of operations. The Company records reserves for contingencies when information available indicates that a loss is probable and the amount of the loss can be reasonably estimated.

Lawsuits filed in state and federal courts in Texas relating to the Pioneer Southwest merger. On May 15, 2013, David Flecker, a purported unitholder of Pioneer Southwest, filed a class action petition on behalf of Pioneer Southwest's unitholders and a derivative suit on behalf of Pioneer Southwest against the Company, Pioneer USA, the General Partner and the directors of the General Partner, in the 134th Judicial District of Dallas County, Texas (the "Flecker Lawsuit"). A similar class action petition and derivative suit was filed against the same defendants on May 20, 2013, in the 160th Judicial District of Dallas County, Texas, by purported unitholder Vipul Patel (the "Patel Lawsuit"). On September 3, 2013, the court consolidated the Patel Lawsuit into the Flecker Lawsuit (as consolidated, the "Texas State Court Lawsuit"), and the plaintiffs filed a consolidated derivative and class action petition on September 5, 2013.

The Texas State Court Lawsuit alleges, among other things, that the consideration offered by the Company in the Pioneer Southwest merger was unfair and inadequate and that, by pursuing a transaction that was the result of an allegedly conflicted and unfair process, the defendants breached their duties under Pioneer Southwest's partnership agreement as well as the implied covenant of good faith and fair dealing, and engaged in self-dealing. Specifically, the lawsuit alleges that the director defendants: (i) engaged in self-dealing, failed to act in good faith toward Pioneer Southwest, and breached their duties owed to Pioneer Southwest; (ii) failed to properly value Pioneer Southwest and its various assets and operations and ignored or failed to protect against the numerous conflicts of interest arising out of the proposed transaction; and (iii) breached the implied covenant of good faith and fair dealing by engaging in a flawed merger process. The Texas State Court Lawsuit also alleges that the Company, Pioneer USA and the General Partner aided and abetted the director defendants in their purported breach of fiduciary duties. Based on these allegations, the plaintiffs in the Texas State Court Lawsuit seek to have the Pioneer Southwest merger rescinded. The plaintiffs also seek money damages and attorneys' fees. The defendants have filed a motion to dismiss the Texas State Court Lawsuit based on improper forum.

In September 2013, representatives of the plaintiffs in the Texas State Court Lawsuit and the defendants entered into a memorandum of understanding (the "Memorandum of Understanding") to settle the claims and allegations made in the lawsuit. The Memorandum of Understanding provided the plaintiffs with a period of confirmatory discovery during which the plaintiffs could confirm the fairness and reasonableness of the settlement contemplated by the Memorandum of Understanding. As part of the consideration for the settlement, the Merger Agreement was amended to provide for contractual appraisal rights for the unitholders. The parties to the Memorandum of Understanding agreed to use their reasonable best efforts to obtain the agreement of any plaintiffs filing similar lawsuits to become party to the Memorandum of Understanding and the related settlement, and it is a condition to the consummation of the final settlement that any such plaintiffs join the settlement or such similar lawsuits otherwise be dismissed with prejudice prior to the final approval of the settlement.

On January 7, 2014, the defendants and representatives of the plaintiffs in the Texas State Court Lawsuit entered into a stipulation of settlement (the "Stipulation of Settlement"). The Stipulation of Settlement provides for a full and complete discharge, dismissal with prejudice, settlement and release of all claims, suits and causes of action by the plaintiffs (other than appraisal rights under the Merger Agreement) against the defendants and their representatives arising out of or relating to the allegations made in the Texas State Court Lawsuit and the Federal Lawsuits (as defined below), the Pioneer Southwest merger or any deliberations, negotiations, disclosures, omissions, press releases, statements or misstatements in connection therewith, any fiduciary or other obligations in respect of the merger or any alternative transaction or under Pioneer Southwest's partnership agreement, or any costs and expenses associated with settlement other than as provided in the Stipulation of Settlement.

On January 11, 2014, the 134th Judicial District, Dallas County, Texas (the "Court") entered a Preliminary Approval Order providing for, among other things, the scheduling of a settlement hearing to be held before the Court, George L. Allen, Sr. Courts Building, 600 Commerce Street, 6th Floor West (Old), Dallas, TX 75202, on March 17, 2014, at 9:30 a.m; the certification, for settlement purposes only, of a Class consisting of all persons who held Pioneer Southwest common units, either of record or beneficially, at any time during the period from and including May 6, 2013 to and including December 17, 2013, the date of consummation of the Pioneer Southwest merger, including any and all of their respective successors-in-interest, predecessors, representatives, trustees, executors, administrators, heirs, assigns, or transferees, and any person or entity acting for or on behalf of, or claiming under, any of them, and specifically including plaintiffs, but excluding defendants, their subsidiary companies, affiliates, assigns, members of their immediate families, and the legal representatives, heirs, successors, or assigns of any such excluded person. All proceedings relating to the allegations made in the Texas State Court Lawsuit other than with respect to the

104

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2013, 2012, and 2011

settlement have been stayed, and the Court entered an injunction against the commencement or prosecution of any action by any member of the Class asserting any of the claims subject to the settlement. There can be no assurance that a final settlement will be approved.

Former lawsuits relating to the Pioneer Southwest merger that have been dismissed

United States District Court for the Northern District of Texas. On August 21, 2013, Allan H. Beverly, a purported unitholder, filed a class action complaint against Pioneer Southwest, the Company, Pioneer USA, MergerCo and the directors of the General Partner in the United States District Court for the Northern District of Texas (the "Beverly Lawsuit"). On September 13, 2013, Douglas Shelton, another purported unitholder, filed a class action complaint against the same defendants in the Beverly Lawsuit (as well as the General Partner) in the same court as the Beverly Lawsuit (the "Shelton Lawsuit" and with the Beverly Lawsuit, the “Federal Lawsuits”). The Beverly Lawsuit alleged that the defendants breached their fiduciary duties by agreeing to the merger by means of an unfair process and for an unfair price. Specifically, the lawsuit alleged that the director defendants: (i) failed to maximize the value of Pioneer Southwest to its public unitholders and took steps to avoid competitive bidding; (ii) failed to properly value Pioneer Southwest; and (iii) ignored or failed to protect against the numerous conflicts of interest arising out of the proposed transaction. The Beverly Lawsuit also alleged that the Company, Pioneer USA and MergerCo aided and abetted the director defendants in their purported breach of fiduciary duties. The Shelton Lawsuit made similar allegations to the Beverly Lawsuit, specifically: (i) that the Company, as controlling unitholder, failed to fulfill its fiduciary duties in connection with the merger because it purportedly could not establish that the proposed merger was the result of a fair process that would return a fair price to the unaffiliated unitholders of Pioneer Southwest; (ii) that the director defendants breached their fiduciary duties by failing to exercise due care and diligence in connection with the proposed merger because the proposed merger was purportedly not the result of a fair process that will return a fair price to the unaffiliated unitholders; and (iii) that the non-director defendants aided and abetted the director defendants in their purported breach of fiduciary duties. The plaintiffs in the Federal Lawsuits sought the same remedies as the plaintiffs in the Texas State Court Lawsuit. The representatives of the plaintiffs in the Federal Lawsuits are also parties to the Memorandum of Understanding. In accordance with the Memorandum of Understanding, the plaintiffs in the Beverly Lawsuit voluntarily dismissed all claims in the lawsuit on October 15, 2013, and the plaintiffs in the Shelton Lawsuit voluntarily dismissed all claims in the lawsuit on October 16, 2013.

Delaware Court of Chancery. On September 23, 2013, Patrick Wilson, another purported unitholder, filed a class action petition on behalf of the unitholders against Pioneer USA, MergerCo, Pioneer Southwest, the General Partner and the directors of the General Partner in the Court of Chancery of the State of Delaware (the "Wilson Lawsuit"). The Wilson Lawsuit alleged that the director defendants breached their purported fiduciary obligations to the unitholders by engaging in a process that undervalued Pioneer Southwest and which allegedly constituted gross negligence, recklessness, willful misconduct, bad faith or knowing violations of law. Additionally, the Wilson Lawsuit alleged that the non-director defendants aided and abetted the purported breaches of fiduciary duties of the director defendants. The Wilson Lawsuit sought the same remedies as the plaintiffs in the Texas State Court Lawsuit and the Federal Lawsuits. The plaintiff in the Wilson Lawsuit voluntarily dismissed that action on January 2, 2014. After participating in and receiving confirmatory discovery, the plaintiff in the Wilson Action has informed representatives of the plaintiffs in the Texas State Court Lawsuit that he intends to participate as a class member in the settlement.

The Company cannot predict the outcome of these or any other lawsuits that might be filed subsequent to the date of the filing of this Report, nor can the Company predict the amount of time and expense that will be required to resolve these lawsuits. See Note C for a description of the Merger Agreement.

Obligations following divestitures. In April 2006, the Company provided the purchaser of its Argentine assets certain indemnifications. The Company remains responsible for certain contingent liabilities related to such indemnifications, subject to defined limitations, including matters of litigation, environmental contingencies, royalty obligations and income taxes. The Company has also retained certain liabilities and indemnified buyers for certain matters in connection with other divestitures, including the sale of its Canadian assets in 2007, the sale of Pioneer Tunisia in February 2011, the sale of Pioneer South Africa in August 2012, the planned sale of Alaska in 2014 and in connection with sales of joint interests. The Company does not believe that these obligations are probable of having a material impact on its liquidity, financial position or future results of operations.

Drilling commitments. The Company periodically enters into contractual arrangements under which the Company is committed to expend funds to drill wells in the future. The Company also enters into agreements to secure drilling rig services, which require the Company to make future minimum payments to the rig operators. The Company records drilling commitments in the periods in which the well is drilled or rig services are performed.

105

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2013, 2012, and 2011

Lease agreements. The Company leases equipment and office facilities under operating leases. Rent expense for the years ended December 31, 2013, 2012 and 2011 were $57.9 million, $48.0 million and $35.2 million, respectively. These payments include $9.8 million, $7.9 million and $5.7 million associated with discontinued operations for the years ended December 31, 2013, 2012 and 2011, respectively, which are included in earnings from discontinued operations, net of tax, in the accompanying consolidated statements of operations.

Future minimum lease commitments under noncancelable operating leases at December 31, 2013 are as follows (in thousands):

2014	$	25,305
2015	$	18,495
2016	$	16,135
2017	$	15,637
2018	$	15,418
Thereafter	$	26,569

Gathering, processing, transportation and fractionation agreements. The Company from time to time enters into, and as of December 31, 2013 is a party to, contractual commitments with midstream service companies and pipeline carriers for future gathering, processing, transportation and fractionation. These commitments are normal and customary for the Company's business activities. Future minimum gathering, processing, transportation and fractionation commitments at December 31, 2013 are as follows (in thousands):

2014	$	353,167
2015	$	404,493
2016	$	418,665
2017	$	282,077
2018	$	245,250
Thereafter	$	773,868

Certain future minimum gathering, processing, transportation and fractionation fees are based upon rates and tariffs subject to change over the lives of the commitments. The above commitments include demand fees associated with volume delivery commitments of up to 50,000 BOEPD through August 2017 that are related to the Company's Permian Basin operations. The Company does not expect to be able to fulfill all of its short-term and long-term delivery obligations from projected production of available reserves; consequently, the Company plans to purchase third party volumes to satisfy its commitment if it is economical to do so; otherwise, it will pay demand fees for commitment shortfalls.

NOTE K.     Related Party Transactions

The Company, through a wholly-owned subsidiary, (i) serves as operator of properties in which it and its affiliated partnerships have an interest and (ii) owns a noncontrolling interest in its unconsolidated affiliate, EFS Midstream, which it manages. Through these relationships, the Company is a party to transactions with the affiliated partnerships and EFS Midstream that represent related party transactions.

Transactions with affiliated partnerships. The Company receives producing well overhead and other fees related to the operation of the properties in which it and its affiliated partnerships have an interest. The affiliated partnerships also reimburse the Company for their allocated share of general and administrative charges. Reimbursements of fees are recorded as reductions to general and administrative expenses in the Company's consolidated statements of operations.

106

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2013, 2012, and 2011

The related party transactions with affiliated partnerships are summarized below for the years ended December 31, 2013, 2012 and 2011:

	Year Ended December 31,
	2013		2012		2011
	(in thousands)
Receipt of lease operating and supervision charges in accordance with standard industry operating agreements	$	2,502	$	2,437	$	2,104
Reimbursement of general and administrative expenses	$	276	$	342	$	313

Transactions with EFS Midstream. The Company, through a wholly-owned subsidiary, (i) provides certain services as the manager of EFS Midstream in accordance with a Master Services Agreement and (ii) is the operator of Eagle Ford Shale properties for which EFS Midstream provides certain services under a Hydrocarbon Gathering and Handling Agreement (the "HGH Agreement"). During 2013, the Company received $25.1 million in distributions from EFS Midstream.

Master Services Agreement. The terms of the Master Services Agreement provide that the Company will perform certain manager services for EFS Midstream and be compensated by monthly fixed payments and variable payments attributable to expenses incurred by employees whose time is substantially dedicated to EFS Midstream's business. During 2013, 2012 and 2011, the Company received $3.0 million, $2.3 million and $2.2 million of fixed payments and $16.4 million, $11.8 million and $8.4 million of variable payments, respectively, from EFS Midstream. During 2013, the Company purchased other plant and equipment from EFS Midstream totaling $2.8 million. The Company also paid $1.9 million to purchase rights of way from EFS Midstream during 2011.

Hydrocarbon Gathering and Handling Agreement. During June 2010, the Company entered into the HGH Agreement with EFS Midstream. In accordance with the terms of the HGH Agreement, EFS Midstream is obligated to construct certain equipment and facilities capable of gathering, treating and transporting oil and gas production from the Eagle Ford Shale properties operated by the Company. The HGH Agreement also obligates the Company and its Eagle Ford Shale working interest partners to use the EFS Midstream gathering, treating and transportation equipment and facilities. In accordance with the terms of the HGH Agreement, the Company paid EFS Midstream $81.3 million, $58.5 million and $21.3 million of gathering and treating fees during 2013, 2012 and 2011, respectively. Such amounts were expensed as oil and gas production costs in the accompanying consolidated statements of operations.

NOTE L.     Major Customers

The Company's share of oil and gas production is sold to various purchasers who must be prequalified under the Company's credit risk policies and procedures. The Company records allowances for doubtful accounts based on the age of accounts receivables and the financial condition of its purchasers and, depending on facts and circumstances, may require purchasers to provide collateral or otherwise secure their accounts.

The following purchasers individually accounted for ten percent or more of the Company's consolidated oil, NGL and gas revenues, including the revenues from discontinued operations, in at least one of the three years ended December 31, 2013:

	Year Ended December 31,
	2013		2012		2011
Plains Marketing LP	26	%	25	%	16	%
Enterprise Products Partners L.P.	12	%	14	%	12	%
Occidental Energy Marketing Inc	12	%	13	%	14	%

The loss of any of these significant purchasers could have a material adverse effect on the ability of the Company to sell its oil and gas production.

107

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2013, 2012, and 2011

NOTE M.    Interest and Other Income    

The following table provides the components of the Company's interest and other income during the years ended December 31, 2013, 2012 and 2011:

	Year Ended December 31,
	2013			2012			2011
	(in thousands)
Other income	$	8,282		$	5,382		$	9,125
Equity interest in income of EFS Midstream	7,266			2,183			1,925
Deferred compensation plan income	5,954			1,872			1,657
Interest income	321			1,465			697
Income (loss) from vertical integration services (a)	(4,862		)	(11,934		)	15,978
Total interest and other income	$	16,961		$	(1,032	)	$	29,382

 ______________________

(a) Income (loss) from vertical integration services represent net margins that result from Company-provided fracture stimulation, drilling and related service operations, which are ancillary to and supportive of the Company's oil and gas joint operating activities, and do not represent intercompany transactions. For the three years ended December 31, 2013, 2012 and 2011, these net margins include $284.9 million, $247.8 million and $50.9 million of gross vertical integration revenues, respectively and $289.8 million, $259.7 million and $34.9 million of total vertical integration costs and expenses, respectively.

NOTE N.    Other Expense

The following table provides the components of the Company's other expense during the years ended December 31, 2013, 2012 and 2011:

	Year Ended December 31,
	2013		2012		2011
	(in thousands)
Impairment of inventory and other property and equipment (a)	$	61,812	$	5,719	$	3,126
Transportation commitment charge (b)	39,121		38,830		23,841
Other	16,386		17,940		11,884
Above market and idle drilling and well service equipment charges (c)	9,771		33,124		20,163
Contingency and environmental accrual adjustments	9,277		478		4,057
Terminated drilling rig contract charges (d)	1,019		15,747		—
Premier Silica acquisition costs	—		2,337		—
Total other expense	$	137,386	$	114,175	$	63,071

 ____________________

(a) Represents charges of $36.3 million to reduce excess materials and supplies inventories to their market value and a charge of $25.5 million to reduce the carrying value of Sendero to its estimated fair value. See Notes C and D for additional information on the fair value of Sendero and material and supplies inventory, respectively.

(b) Primarily represents firm transportation payments on excess pipeline capacity commitments.

(c) Primarily represents expenses attributable to the portion of Pioneer's contracted drilling rig rates that were above market rates and idle drilling rig and fracture stimulation fleet fees, neither of which were chargeable to joint operations.

(d) Primarily represents charges to terminate rig contracts that were not required to meet planned drilling activities.

108

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2013, 2012, and 2011

NOTE O.    Income Taxes

The Company and its eligible subsidiaries file a consolidated United States federal income tax return. Certain subsidiaries are not eligible to be included in the consolidated United States federal income tax return and separate provisions for income taxes have been determined for these entities or groups of entities. The tax returns and the amount of taxable income or loss are subject to examination by United States federal, state, local and foreign taxing authorities. The Company made current and estimated tax payments of $12.4 million, $32.3 million and $22.3 million (net of tax refunds) during 2013, 2012 and 2011, respectively. These payments and net refunds include tax payments related to Pioneer Tunisia's and Pioneer South Africa's operations of $9.8 million and $12.2 million during 2012 and 2011, respectively.

The Company continually assesses both positive and negative evidence to determine whether it is more likely than not that deferred tax assets can be realized prior to their expiration. Pioneer monitors Company-specific, oil and gas industry and worldwide economic factors and assesses the likelihood that the Company's net operating loss carryforwards ("NOLs") and other deferred tax attributes in the United States, state, local and foreign tax jurisdictions will be utilized prior to their expiration.

The Company recognizes the tax benefit from an uncertain tax position only if it is more likely than not that the tax position will be sustained upon examination by the taxing authorities, based upon the technical merits of the position. As of December 31, 2013, the Company had unrecognized tax benefits of $21.2 million resulting from net operating loss carryovers and alternative minimum tax credits obtained from the acquisition of Premier Silica.  The unrecognized tax benefit is recorded as a reduction of the associated deferred tax asset and, if recognized, would affect the annual effective tax rate.  The Company expects to resolve uncertainties regarding the unrecognized tax benefit within twelve months of December 31, 2013.  There were no unrecognized tax benefits as of December 31, 2012.

With respect to income taxes, the Company's policy is to account for interest charges as interest expense and any penalties as other expense in the consolidated statements of operations. The Company files income tax returns in the United States federal jurisdiction, and various state and foreign jurisdictions. As of December 31, 2013, there are no proposed adjustments or uncertain positions in any jurisdiction that would have a significant effect on the Company's future results of operations or financial position. The Company's earliest open years in its key jurisdictions are as follows:

United States	2012
Various U.S. states	2009
South Africa	2008

The Company's income tax (provision) benefit and amounts separately allocated were attributable to the following items for the years ended December 31, 2013, 2012 and 2011:

	Year Ended December 31,
	2013		2012			2011
	(in thousands)
Income tax (provision) benefit from continuing operations	$	211,775	$	(290,488	)	$	(188,278	)
Income tax (provision) benefit from discontinued operations	250,882		182,437			(267,314		)
Changes in goodwill - tax benefits related to stock-based compensation	—		—			40
Changes in stockholders' equity:
Net deferred hedge (loss) gain	—		(1,725		)	8,407
Excess tax benefit related to stock-based compensation	17,639		58,486			31,087
Tax benefit attributable to conversion of 2.875% senior convertible notes	38,415		—			—
Tax benefit attributable to 2013 merger with Pioneer Southwest	200,091		—			—
Tax attributable to 2008 Pioneer Southwest initial public offering	—		(49,072		)	—
Tax attributable to 2009 and 2011 issuance of Pioneer Southwest common units	—		—			(23,711		)
Tax on Pioneer Southwest common units sold by the Company during 2011	—		—			(15,381		)

109

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2013, 2012, and 2011

The Company's income tax (provision) benefit attributable to income from continuing operations consisted of the following for the years ended December 31, 2013, 2012 and 2011:

	Year Ended December 31,
	2013			2012			2011
	(in thousands)
Current:
U.S. federal	$	(10,406	)	$	(5,575	)	$	—
U.S. state	44			1,316			(6,948		)
Foreign	(237		)	—			—
	(10,599		)	(4,259		)	(6,948		)
Deferred:
U.S. federal	201,060			(272,289		)	(179,699		)
U.S. state	21,314			(13,940		)	(1,631		)
	222,374			(286,229		)	(181,330		)
Income tax (provision) benefit from continuing operations	$	211,775		$	(290,488	)	$	(188,278	)

Reconciliations of the United States federal statutory tax rate to the Company's effective tax rate for income (loss) from continuing operations are as follows for the years ended December 31, 2013, 2012 and 2011:

	Year Ended December 31,
	2013			2012			2011
	(in thousands, except percentages)
Income (loss) from continuing operations before income taxes	$	(561,719	)	$	837,520		$	596,068
Less: Net income attributable to noncontrolling interests	(38,865		)	(50,537		)	(47,425		)
Income (loss) from continuing operations attributable to common stockholders before income taxes	(600,584		)	786,983			548,643
Federal statutory income tax rate	35		%	35		%	35		%
(Provision) benefit for federal income taxes	210,204			(275,444		)	(192,025		)
State income tax (provision) benefit (net of federal tax)	13,883			(8,206		)	(5,576		)
Other	(12,312		)	(6,838		)	9,323
Income tax (provision) benefit from continuing operations	$	211,775		$	(290,488	)	$	(188,278	)
Effective income tax rate, excluding income attributable to the noncontrolling interest	35		%	37		%	34		%

110

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2013, 2012, and 2011

The tax effects of temporary differences that give rise to significant portions of the deferred tax assets and deferred tax liabilities related to continuing operations are as follows as of December 31, 2013 and 2012:

	December 31,
	2013			2012
	(in thousands)
Deferred tax assets:
Net operating loss carryforward (a) (b)	$	328,874		$	509,485
Asset retirement obligations	73,623			72,391
Incentive plans	67,990			51,056
Other	74,184			107,836
Total deferred tax assets	544,671			740,768
Deferred tax liabilities:
Oil and gas properties, principally due to differences in basis, depletion and the deduction of intangible drilling costs for tax purposes	(1,569,886		)	(2,322,571		)
Other property and equipment, principally due to the deduction of bonus depreciation for tax purposes	(254,632		)	(263,939		)
Net deferred hedge gains	(108,784		)	(173,097		)
Other	(103,255		)	(208,058		)
Total deferred tax liabilities	(2,036,557		)	(2,967,665		)
Net deferred tax liability	$	(1,491,886	)	$	(2,226,897	)
Reflected in accompanying consolidated balance sheets as:
Current deferred income tax liability	$	(19,169	)	$	(86,481	)
Noncurrent deferred income tax liability	(1,472,717		)	(2,140,416		)
Total	$	(1,491,886	)	$	(2,226,897	)

____________________

(a) Net operating loss carryforwards as of December 31, 2013 consist of $917.4 million of U.S. federal NOLs which expire primarily in 2032, $122.0 million of Colorado NOLs which expire between 2027 and 2033 and $50.6 million of Kansas NOLs which expire between 2018 and 2023.

(b) Net operating loss carryforwards as of December 31, 2013 are net of a $1.5 million valuation allowance relating to $32 million of Kansas NOLs that the Company believes will more likely than not expire unutilized.

NOTE P.    Net Income Per Share Attributable To Common Stockholders

In the calculation of basic net income (loss) per share attributable to common stockholders, participating securities are allocated earnings based on actual dividend distributions received plus a proportionate share of undistributed net income attributable to common stockholders, if any, after recognizing distributed earnings. The Company's participating securities do not participate in undistributed net losses because they are not contractually obligated to do so. The computation of diluted net income (loss) per share attributable to common stockholders reflects the potential dilution that could occur if securities or other contracts to issue common stock that are dilutive were exercised or converted into common stock or resulted in the issuance of common stock that would then share in the earnings of the Company. During periods in which the Company realizes a loss from continuing operations attributable to common stockholders, securities or other contracts to issue common stock would not be dilutive to net loss per share and conversion into common stock is assumed not to occur. Diluted net income (loss) per share is calculated under both the two-class method and the treasury stock method and the more dilutive of the two calculations is presented.

The Company's basic net income (loss) per share attributable to common stockholders is computed as (i) net income (loss) attributable to common stockholders, (ii) less participating share- and unit-based basic earnings (iii) divided by weighted average basic shares outstanding. The Company's diluted net income (loss) per share attributable to common stockholders is computed as (i) basic net income (loss) attributable to common stockholders, (ii) plus diluted adjustments to participating undistributed earnings (iii) divided by weighted average diluted shares outstanding (excluding shares held in treasury).

111

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2013, 2012, and 2011

The following table is a reconciliation of the Company's net income (loss) attributable to common stockholders to basic net income (loss) attributable to common stockholders and to diluted net income (loss) attributable to common stockholders for the years ended December 31, 2013, 2012 and 2011:

	Year Ended December 31, 2013
	Continuing Operations			Discontinued Operations			Total
	(in thousands)
Net loss attributable to common stockholders	$	(388,809	)	$	(449,605	)	$	(838,414	)
Participating basic earnings (a)	(60		)	(70		)	(130		)
Basic loss attributable to common stockholders	(388,869		)	(449,675		)	(838,544		)
Reallocation of participating earnings (a)	—			—			—
Diluted loss attributable to common stockholders	$	(388,869	)	$	(449,675	)	$	(838,544	)

	Year Ended December 31, 2012
	Continuing Operations			Discontinued Operations			Total
	(in thousands)
Net income (loss) attributable to common stockholders	$	496,495		$	(304,210	)	$	192,285
Participating basic earnings (a)	(2,160		)	(869		)	(3,029		)
Basic income (loss) attributable to common stockholders	494,335			(305,079		)	189,256
Reallocation of participating earnings (a)	115			46			161
Diluted income (loss) attributable to common stockholders	$	494,450		$	(305,033	)	$	189,417

	Year Ended December 31, 2011
	Continuing Operations			Discontinued Operations			Total
	(in thousands)
Net income attributable to common stockholders	$	360,365		$	474,124		$	834,489
Participating basic earnings (a)	(6,554		)	(8,624		)	(15,178		)
Basic net income attributable to common stockholders	353,811			465,500			819,311
Reallocation of participating earnings (a)	166			219			385
Diluted income attributable to common stockholders	$	353,977		$	465,719		$	819,696

 ______________________

(a) Unvested restricted stock awards and Pioneer Southwest phantom unit awards (prior to the December 2013 Pioneer Southwest merger) represent participating securities because they participate in nonforfeitable dividends or distributions with the common equity owners of the Company or Pioneer Southwest, as applicable. Participating share- or unit-based earnings represent the distributed and undistributed earnings of the Company attributable to the participating securities. Unvested restricted stock awards and phantom unit awards do not participate in undistributed net losses as they are not contractually obligated to do so.

112

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2013, 2012, and 2011

The following table is a reconciliation of basic weighted average common shares outstanding to diluted weighted average common shares outstanding for the years ended December 31, 2013, 2012 and 2011:

	Year Ended December 31,
	2013 (a)	2012	2011
	(in thousands)
Weighted average common shares outstanding:
Basic	136,130	122,966	116,904
Dilutive common stock options (b)	—	183	190
Contingently issuable—performance shares	—	180	424
Convertible Senior Notes dilution (c)	—	2,991	1,697
Diluted	136,130	126,320	119,215

______________________

(a) The following common share equivalents were excluded from the weighted average diluted shares for the year ended December 31, 2013 because they would have been anti-dilutive to the loss recorded for the period: (i) 135,190 outstanding options to purchase the Company's common stock, (ii) 200,360 common shares attributable to unvested performance awards and (iii) 1,087,401 common shares related to the 2013 redemption of the Convertible Senior Notes, representing the weighted average portion of the year that is not included in the basic weighted average common shares outstanding.

(b) Options to purchase 129,918 shares of the Company's common stock were excluded from the diluted income per share calculations for the year ended December 31, 2012 because they would have been anti-dilutive to the calculation.

(c) Weighted average common shares outstanding have been increased to reflect the dilutive effect that would have resulted if the Convertible Senior Notes had qualified for and been converted during the years ended December 31, 2012 and 2011, respectively.

113

PIONEER NATURAL RESOURCES COMPANY

UNAUDITED SUPPLEMENTARY INFORMATION

December 31, 2013, 2012 and 2011

Oil & Gas Exploration and Production Activities

The Company has operations in one business and geographic segment, that being oil and gas exploration and production. See the Company's accompanying statements of operations for information about results of operations for oil and gas producing activities.

Capitalized Costs

	December 31,
	2013 (a)			2012
	(in thousands)
Oil and gas properties:
Proved	$	14,291,483		$	14,259,708
Unproved	123,382			231,555
Capitalized costs for oil and gas properties	14,414,865			14,491,263
Less accumulated depletion, depreciation and amortization	(5,293,775		)	(4,412,913		)
Net capitalized costs for oil and gas properties	$	9,121,090		$	10,078,350

_______________

(a) Includes $885.3 million of proved property and $390.7 million of accumulated depletion, depreciation and amortization related to Pioneer Alaska and the Barnett Shale field, which were classified as assets held for sale at December 31, 2013.

Costs Incurred for Oil and Gas Producing Activities(a)

		Year Ended December 31,
		2013		2012		2011
	(in thousands)
Property acquisition costs:
Proved		$	12,861	$	16,962	$	7,571
Unproved		63,162		140,515		124,326
Exploration costs		1,290,472		966,828		567,196
Development costs		1,481,318		1,881,459		1,474,393
Total costs incurred		$	2,847,813	$	3,005,764	$	2,173,486

_______________

(a)     The costs incurred for oil and gas producing activities includes the following amounts of asset retirement obligations:

	Year Ended December 31,
	2013		2012		2011
	(in thousands)
Proved property acquisition costs	$	—	$	24	$	6
Exploration costs	2,560		2,200		1,222
Development costs	9,954		56,648		18,274
Total	$	12,514	$	58,872	$	19,502

Reserve Quantity Information

The estimates of the Company's proved reserves as of December 31, 2013, 2012 and 2011 were based on evaluations prepared by the Company's engineers and audited by independent petroleum engineers with respect to the Company's major properties and prepared by the Company's engineers with respect to all other properties. Proved reserves were estimated in accordance with guidelines established by the United States Securities and Exchange Commission (the "SEC") and the FASB, which require that reserve estimates be prepared under existing economic and operating conditions based upon an average of the first-day-of-the-month commodity price during the 12-month period ending on the balance sheet date with no provision for price and cost escalations except by contractual arrangements.

114

PIONEER NATURAL RESOURCES COMPANY

UNAUDITED SUPPLEMENTARY INFORMATION

December 31, 2013, 2012 and 2011

Proved reserve quantity estimates are subject to numerous uncertainties inherent in the estimation of quantities of proved reserves and in the projection of future rates of production and the timing of development expenditures. The accuracy of such estimates is a function of the quality of available data and of engineering and geological interpretation and judgment. Results of subsequent drilling, testing and production may cause either upward or downward revision of previous estimates. Further, the volumes considered to be commercially recoverable fluctuate with changes in prices and operating costs. The Company emphasizes that proved reserve estimates are inherently imprecise and that estimates of new discoveries are more imprecise than those of currently producing oil and gas properties. Accordingly, these estimates are expected to change as additional information becomes available in the future.

115

PIONEER NATURAL RESOURCES COMPANY

UNAUDITED SUPPLEMENTARY INFORMATION

December 31, 2013, 2012 and 2011

The following table provides a rollforward of total proved reserves for the years ended December 31, 2013, 2012 and 2011. Oil and NGL volumes are expressed in thousands of BBLS ("MBBLs"), gas volumes are expressed in millions of cubic feet ("MMCF") and total volumes are expressed in thousands of barrels of oil equivalent ("MBOE").

	Year Ended December 31,
	2013								2012								2011
	Oil (MBBLs)		NGLs (MBBLs)		Gas (MMCF) (a)		Total (MBOE)		Oil (MBBLs)		NGLs (MBBLs)		Gas (MMCF) (a)		Total (MBOE)		Oil (MBBLs)		NGLs (MBBLs)		Gas (MMCF) (a)		Total (MBOE)
Balance, January 1	486,838		232,576		2,197,480		1,085,661		430,005		211,035		2,531,038		1,062,881		380,809		184,218		2,674,522		1,010,781
Production (b)	(27,455	)	(12,999	)	(157,690	)	(66,736	)	(22,990	)	(10,913	)	(161,197	)	(60,769	)	(15,219	)	(8,208	)	(150,932	)	(48,582	)
Revisions of previous estimates	(184,359	)	(64,986	)	(304,531	)	(300,101	)	(11,158	)	(17,417	)	(485,216	)	(109,444	)	8,938		(5,750	)	(247,196	)	(38,013	)
Extensions and discoveries	78,922		38,639		205,899		151,878		78,375		48,422		320,243		180,170		70,892		39,912		273,043		156,313
Sales of minerals-in-place	(11,937	)	(7,931	)	(35,326	)	(25,756	)	(275	)	(588	)	(16,845	)	(3,671	)	(19,619	)	—		(22,968	)	(23,447	)
Purchases of minerals-in-place	96		123		509		304		5,383		2,037		9,457		8,996		2,810		863		4,569		4,435
Improved recovery	—		—		—		—		7,498		—		—		7,498		1,394		—		—		1,394
Balance, December 31 (c)	342,105		185,422		1,906,341		845,250		486,838		232,576		2,197,480		1,085,661		430,005		211,035		2,531,038		1,062,881

 ______________________

(a) The proved gas reserves as of December 31, 2013, 2012 and 2011 include 240,093 MMCF, 280,344 MMCF and 301,123 MMCF, respectively, of gas that the Company expected to be produced and utilized as field fuel. Field fuel is gas consumed to operate field equipment (primarily compressors) prior to the gas being delivered to a sales point.

(b) Production for 2013, 2012 and 2011 includes 18,813 MMCF, 18,930 MMCF and 17,727 MMCF of field fuel, respectively. Also, for 2013, 2012 and 2011, production includes 4,669 MBOE, 5,026 MBOE and 4,681 MBOE of production associated with discontinued operations. See Note C for additional information regarding the Company's discontinued operations.

(c) As of December 31, 2013 and 2012, the portions of the Company's proved reserves attributable to discontinued operations in the Barnett Shale field and Alaska were 47,690 MBOE and 98,796 MBOE, respectively. As of December 31, 2011, the portion of the Company's proved reserves attributable to discontinued operations in the Barnett Shale field, Alaska and South Africa was 64,862 MBOE. Upon completion of the Pioneer Southwest merger in 2013, the Company had no proved reserves associated with any subsidiary in which there is a noncontrolling interest. Proved reserves attributable to noncontrolling interests in Pioneer Southwest were approximately two percent as of both December 31, 2012 and 2011.

116

PIONEER NATURAL RESOURCES COMPANY

UNAUDITED SUPPLEMENTARY INFORMATION

December 31, 2013, 2012 and 2011

Revisions of previous estimates. At December 31, 2013, revisions of previous estimates are comprised of 319 MMBOE of proved undeveloped reserves that are no longer expected to be drilled and 11 MMBOE of negative revisions attributable to updated performance profiles and cost estimates, partially offset by 30 MMBOE of positive price revisions. The Company continues to shift its drilling activity in the Spraberry/Wolfcamp play in the Midland Basin of West Texas from vertical drilling to horizontal drilling. The Company believes that replacing vertical drilling with horizontal drilling will enhance ultimate resource recoveries and improve rates of return per dollar invested. As a result, Pioneer no longer expects to drill a significant number of its previously recorded vertical proved undeveloped locations. Consequently, proved undeveloped reserves were reduced by 231 MMBOE associated with vertical drilling locations in the Spraberry/Wolfcamp. This reduction in proved reserves is reflected in revisions of previous estimates. Based on the limited horizontal drilling conducted by Pioneer to date in six Wolfcamp and Spraberry shale intervals across Pioneer's acreage position in the Spraberry/Wolfcamp field, sufficient production and well control data is not yet available to support the replacement of the vertical proved undeveloped reserves with horizontal proved undeveloped reserve additions. Pioneer also removed an additional 88 MMBOE of proved undeveloped reserves that are primarily attributable to the announced divestitures of Pioneer's Alaska and Barnett Shale Combo assets (45 MMBOE) and previously recorded gas wells that are no longer expected to be drilled due to the reallocation of drilling capital to higher-rate-of-return oil wells. The December 31, 2013 NYMEX price used for oil and gas reserve preparation based upon SEC guidelines was $96.82 per barrel of oil and $3.67 per Mcf of gas, compared to $94.84 per barrel of oil and $2.76 per Mcf of gas at December 31, 2012.

At December 31, 2012, revisions of previous estimates are comprised of 82 MMBOE of negative price revisions and 27 MMBOE of negative revisions due to updated performance profiles and cost estimates. The December 31, 2012 NYMEX price used for oil and gas reserve preparation based upon SEC guidelines was $94.84 per barrel of oil and $2.76 per Mcf of gas, compared to $96.13 per barrel of oil and $4.12 per Mcf of gas at December 31, 2011.

At December 31, 2011, revisions of previous estimates were comprised of 28 MMBOE of negative price revisions and 10 MMBOE of negative revisions due to updated performance profiles and cost estimates. The December 31, 2011 NYMEX price used for oil and gas reserve preparation based upon SEC guidelines increased $16.85 per barrel of oil and decreased $0.25 per Mcf of gas from $79.28 per barrel of oil and $4.37 per Mcf of gas at December 31, 2010.

Extensions and discoveries. Extensions and discoveries at December 31, 2013, 2012 and 2011 are primarily comprised of discoveries and extensions in the Wolfcamp, Strawn, Atoka and Mississippian horizons in the Spraberry field and discoveries in the Eagle Ford Shale and Barnett Shale Combo plays.

Sales of minerals-in-place. Sales of minerals-in-place in 2013, 2012 and 2011 are primarily related to the divestment of 40 percent of the Company's interest in 207,000 net acres in the horizontal Wolfcamp Shale play in the southern portion of the Spraberry field in West Texas, Pioneer South Africa and Pioneer Tunisia, respectively. See Note C for additional information regarding the Company's divestitures and discontinued operations.

Purchases of minerals-in-place. Purchases of minerals-in-place during all years are primarily attributable to acquisitions in the Company's Spraberry field.

Improved recovery. Additions from improved recovery during 2012 and 2011 relate to recognizing secondary recovery reserves attributable to waterflooding the Nuiqsut horizon of the Alaskan Oooguruk development project.

117

PIONEER NATURAL RESOURCES COMPANY

UNAUDITED SUPPLEMENTARY INFORMATION

December 31, 2013, 2012 and 2011

The following table provides the Company's proved developed and proved undeveloped reserves for the years ended December 31, 2013, 2012 and 2011.

	Oil (MBBLs)	NGLs (MBBLs)	Gas (MMCF)	Total (MBOE)
Proved Developed Reserves:
December 31, 2011	190,206	120,405	1,853,363	619,506
December 31, 2012	230,700	134,637	1,605,209	632,872
December 31, 2013	256,638	148,161	1,703,667	688,743
	Oil (MBBLs)	NGLs (MBBLs)	Gas (MMCF)	Total (MBOE)
Proved Undeveloped Reserves:
December 31, 2011	239,799	90,630	677,675	443,375
December 31, 2012	256,138	97,939	592,271	452,789
December 31, 2013	85,467	37,261	202,674	156,507

The following table summarizes the Company's proved undeveloped reserves activity during the year ended December 31, 2013 (in MBOE).

Beginning proved undeveloped reserves	452,789
Revisions of previous estimates	(309,435	)
Extensions and discoveries	79,711
Sales of minerals-in-place	(16,026	)
Transfers to proved developed	(50,532	)
Ending proved undeveloped reserves	156,507

As of December 31, 2013, the Company had 783 proved undeveloped well locations as compared to 3,810 and 4,599 at December 31, 2012 and 2011, respectively. The Company has 26 proved undeveloped well locations (representing 2 MMBOE of proved reserves) that are scheduled to be drilled more than five years from their original date of booking. All of these wells are scheduled to be drilled within five years of the December 31, 2009 effective date of the Commission's Final Rule on the Modernization of Oil and Gas Reporting.

The changes in proved undeveloped reserves during 2013 are comprised of the following items:

Revisions of previous estimates. Revisions of previous estimates are comprised of 319 MMBOE of proved undeveloped reserves that are no longer expected to be drilled, partially offset by 8 MMBOE of positive revisions attributable to updated performance profiles and cost estimates and 1 MMBOE of positive price revisions. As described in revisions of previous estimates of total proved reserves, Pioneer no longer expects to drill a significant number of its previously recorded vertical proved undeveloped locations. Consequently, proved undeveloped reserves were reduced by 231 MMBOE associated with vertical drilling locations in the Spraberry/Wolfcamp. This reduction in proved reserves is reflected in revisions of previous estimates. Based on the limited horizontal drilling conducted by Pioneer to date in six Wolfcamp and Spraberry shale intervals across Pioneer's acreage position in the Spraberry/Wolfcamp field, sufficient production and well control data is not yet available to support the replacement of the vertical proved undeveloped reserves with horizontal proved undeveloped reserve additions. Pioneer also removed an additional 88 MMBOE of proved undeveloped reserves that are primarily attributable to the announced divestitures of Pioneer's Alaska and Barnett Shale Combo assets (45 MMBOE) and previously recorded gas wells that are no longer expected to be drilled due to the reallocation of drilling capital to higher-rate-of-return oil wells.

Extensions and discoveries. Extensions and discoveries are primarily comprised of extensions and discoveries in the Wolfcamp, Strawn, Atoka and Mississippian horizons in the Spraberry field and discoveries in the Eagle Ford Shale.

Sales of minerals-in-place. Sales of minerals-in-place are primarily related to the divestment of a 40 percent interest in 207,000 net acres in the horizontal Wolfcamp Shale play in the southern portion of the Spraberry field in West Texas and sales in the Barnett Shale Combo play.

118

PIONEER NATURAL RESOURCES COMPANY

UNAUDITED SUPPLEMENTARY INFORMATION

December 31, 2013, 2012 and 2011

Transfers to proved developed. Transfers to proved developed reserves represents those undeveloped proved reserves that moved to proved developed as a result of development drilling during 2013. During 2013, the Company incurred $1.5 billion of development costs and developed 11 percent of its proved undeveloped reserves. See the following table for the Company's firm plans for future development expenditures.

Within the Spraberry field, the Company uses both public and proprietary geologic data to establish continuity of the formation and its producing properties. This included seismic data and interpretations (2-D, 3-D and micro seismic); open hole log information (both vertical and horizontally collected) and petrophysical analysis of the log data; mud logs; gas sample analysis; drill cutting samples; measurements of total organic content; thermal maturity; sidewall cores and data measured from the Company's internal core analysis facility. After the geologic area was shown to be continuous, statistical analysis of existing producing wells was conducted to generate areas of reasonable certainty at distances from established production. As a result of this analysis, proved undeveloped reserves for drilling locations within these areas of reasonable certainty were recorded during 2013.

While the Company expects, based on Management's Price Outlooks, that future operating cash flows will provide adequate funding for future development of its proved undeveloped reserves over the next five years, it may also use any combination of internally-generated cash flows, cash and cash equivalents on hand, availability under its credit facility, proceeds from the sale of joint interests and nonstrategic assets or external financing sources to fund these and other capital expenditures, including exploratory drilling and acquisitions. The following table represents the estimated timing and cash flows of developing the Company's proved undeveloped reserves as of December 31, 2013 (dollars in thousands):

Year Ended December 31, (a)	Estimated Future Production (MBOE)	Future Cash Inflows		Future Production Costs		Future Development Costs		Future Net Cash Flows
2014	4,076	$	254,760	$	40,458	$	750,851	$	(536,549	)
2015	12,974	864,940		129,438		924,482		(188,980		)
2016	13,569	866,283		143,693		519,534		203,056
2017	13,831	840,869		149,559		319,391		371,919
2018	10,956	663,828		121,608		116,153		426,067
Thereafter (b)	101,101	6,174,957		1,785,314		75,427		4,314,216
	156,507	$	9,665,637	$	2,370,070	$	2,705,838	$	4,589,729

______________________ 

(a) Production and cash flows represent the drilling results from the respective year plus the incremental effects of proved undeveloped drilling.

(b) The $75.4 million of future development costs includes (i) $26.5 million of completion costs forecasted after 2018 and (ii) $48.9 million of net abandonment costs in future years.

119

PIONEER NATURAL RESOURCES COMPANY

UNAUDITED SUPPLEMENTARY INFORMATION

December 31, 2013, 2012 and 2011

Standardized Measure of Discounted Future Net Cash Flows

The standardized measure of discounted future net cash flows is computed by applying commodity prices used in determining proved reserves (with consideration of price changes only to the extent provided by contractual arrangements) to the estimated future production of proved reserves less estimated future expenditures (based on year-end estimated costs) to be incurred in developing and producing the proved reserves, discounted using a rate of ten percent per year to reflect the estimated timing of the future cash flows. Future income taxes are calculated by comparing undiscounted future cash flows to the tax basis of oil and gas properties plus available carryforwards and credits and applying the current tax rates to the difference. The discounted future cash flow estimates do not include the effects of the Company's commodity derivative contracts. Utilizing the first-day-of-the-month commodity prices during the 12-month period ending on December 31, 2013, held constant over each derivative contract's term, the net present value of the Company's derivative contracts discounted at ten percent was a liability of $47.7 million at December 31, 2013.

Discounted future cash flow estimates like those shown below are not intended to represent estimates of the fair value of oil and gas properties. Estimates of fair value should also consider probable and possible reserves, anticipated future commodity prices, interest rates, changes in development and production costs and risks associated with future production. Because of these and other considerations, any estimate of fair value is necessarily subjective and imprecise.

The following tables provide the standardized measure of discounted future cash flows as of December 31, 2013, 2012 and 2011, as well as a rollforward in total for each respective year:

	December 31,
	2013			2012			2011
	(in thousands)
Oil and gas producing activities:
Future cash inflows	$	43,542,036		$	56,692,889		$	59,220,357
Future production costs	(20,044,053		)	(23,977,062		)	(21,154,016		)
Future development costs (a)	(4,101,795		)	(9,803,698		)	(8,466,407		)
Future income tax expense	(4,954,730		)	(6,600,395		)	(9,581,515		)
	14,441,458			16,311,734			20,018,419
10% annual discount factor	(7,140,847		)	(9,958,336		)	(12,205,396		)
Standardized measure of discounted future cash flows (b)	$	7,300,611		$	6,353,398		$	7,813,023

 __________________

(a) Includes $815.4 million, $840.0 million and $785.0 million of undiscounted future asset retirement expenditures estimated as of December 31, 2013, 2012 and 2011, respectively, using current estimates of future abandonment costs. See Note I for additional information regarding the Company's discounted asset retirement obligations.

(b) Includes $282.6 million and $378.6 million attributable to a 48 percent noncontrolling interest in Pioneer Southwest for 2012 and 2011, respectively.

120

PIONEER NATURAL RESOURCES COMPANY

UNAUDITED SUPPLEMENTARY INFORMATION

December 31, 2013, 2012 and 2011

Changes in Standardized Measure of Discounted Future Net Cash Flows

	Year Ended December 31,
	2013			2012			2011
	(in thousands)
Oil and gas sales, net of production costs	$	(2,499,851	)	$	(2,038,353	)	$	(1,755,153	)
Revisions of previous estimates:
Net changes in prices and production costs	(1,772,269		)	(3,069,880		)	2,615,481
Changes in future development costs	1,339,923			(1,649,417		)	(1,280,213		)
Revisions in quantities	(2,675,762		)	(1,126,865		)	(442,120		)
Accretion of discount	832,351			1,109,022			800,468
Changes in production rates, timing and other (a)	2,453,933			743,212			1,660,419
Extensions, discoveries and improved recovery	2,248,416			1,731,465			1,676,866
Development costs incurred during the period	1,254,832			1,399,731			750,268
Sales of minerals-in-place	(338,261		)	(38,106		)	(1,021,513		)
Purchases of minerals-in-place	3,834			172,474			81,036
Change in present value of future net revenues	847,146			(2,766,717		)	3,085,539
Net change in present value of future income taxes	100,067			1,307,092			(684,525		)
	947,213			(1,459,625		)	2,401,014
Balance, beginning of year	6,353,398			7,813,023			5,412,009
Balance, end of year	$	7,300,611		$	6,353,398		$	7,813,023

__________________

(a) The Company's changes in Standardized Measure attributable to production rates, timing and other primarily represent changes in the Company's estimates of when proved reserve quantities will be realized. During the twelve months ended December 31, 2013, the Company's undiscounted future net cash flows from proved reserves declined; however, the timing of the recovery of the future net cash flows accelerated, partially due to the aforementioned removal of lower-return-on-investment vertical well locations, resulting in an increase in Standardized Measure. During the twelve months ended December 31, 2012 and 2011, the Company increased its development drilling capital plans, which had the effect of accelerating the estimated timing of development and realization of undeveloped proved reserves.

121

PIONEER NATURAL RESOURCES COMPANY

UNAUDITED SUPPLEMENTARY INFORMATION

December 31, 2013, 2012 and 2011

Selected Quarterly Financial Results

The following table provides selected quarterly financial results for the years ended December 31, 2013 and 2012, with adjustments to conform to the annual results:

	Quarter
	First			Second			Third			Fourth
	(in thousands, except per share data)
Year Ended December 31, 2013:
Oil and gas revenues:
As reported	$	787,855		$	845,136		$	908,757		$	809,939
Adjustment for discontinued operations	(59,354		)	(63,938		)	(72,699		)	—
As Adjusted	$	728,501		$	781,198		$	836,058		$	809,939
Total revenues and other income: (a)
As reported	$	831,587		$	1,181,727		$	826,822		$	970,783
Adjustment for derivative losses, net	(42,243		)	—			—			—
Adjustment for sales of purchased oil and gas (b)	55,905			56,076			82,238			—
Adjustment for discontinued operations	(78,936		)	(78,589		)	(85,860		)	—
As Adjusted	$	766,313		$	1,159,214		$	823,200		$	970,783
Total costs and expenses: (c)
As reported	$	663,058		$	638,224		$	670,042		$	2,328,355
Adjustment for derivative losses, net (a)	(42,243		)	—			—			—
Adjustment for purchased oil and gas (b)	55,727			54,984			85,424			—
Adjustment for other expense (b)	178			1,092			(3,186		)	—
Adjustment for discontinued operations	(53,222		)	(58,621		)	(58,583		)	—
As Adjusted	$	623,498		$	635,679		$	693,697		2,328,355
Net income (loss)	$	108,735		$	351,474		$	98,547		$	(1,358,305	)
Net income (loss) attributable to common stockholders	$	100,663		$	337,263		$	91,125		$	(1,367,465	)
Net income (loss) attributable to common stockholders per share:
Basic	$	0.77		$	2.42		$	0.65		$	(9.82	)
Diluted	$	0.75		$	2.40		$	0.65		$	(9.82	)
Year Ended December 31, 2012:
Oil and gas revenues:
As reported	$	718,956		$	641,737		$	716,327		$	734,640
Adjustment for discontinued operations	(54,908		)	(61,719		)	(59,461		)	(60,261		)
As Adjusted	$	664,048		$	580,018		$	656,866		$	674,379
Total revenues and other income: (a)
As reported	$	784,460		$	917,975		$	615,437		$	818,686
Adjustment for derivative gains, net	91,750			—			—			—
Adjustment for sales of purchased oil and gas (b)	20,052			20,095			29,891			52,055
Adjustment for discontinued operations	(66,753		)	(61,719		)	(75,630		)	(73,778		)
As Adjusted	$	829,509		$	876,351		$	569,698		$	796,963
Total costs and expenses:
As reported	$	456,494		$	1,014,615		$	615,419		$	769,973
Adjustment for derivative gains, net	91,750			—			—			—
Adjustment for purchased oil and gas (b)	19,168			20,294			29,687			51,259
Adjustment for other expense (b)	884			(199		)	204			796
Adjustment for discontinued operations	(71,473		)	(507,161		)	(44,693		)	(212,016		)
As Adjusted	$	496,823		$	527,549		$	600,617		$	610,012
Net income (loss)	$	220,958		$	(39,537	)	$	21,699		$	39,702
Net income (loss) attributable to common stockholders	$	214,619		$	(70,392	)	$	19,224		$	28,834
Net income (loss) attributable to common stockholders per share:
Basic	$	1.73		$	(0.57	)	$	0.15		$	0.23
Diluted	$	1.68		$	(0.57	)	$	0.15		$	0.22

 _____________________

(a) The Company's total revenues and other income include net derivative gains of $144.4 million and $4.3 million during the second and fourth quarters of 2013, respectively, and net derivative losses of $42.2 million and $102.5 million during the first and third quarters of 2013, respectively. During 2012, the Company's total revenues and other income included net derivative gains of $91.8 million, $275.8 million and $86.7 million during the first, second and fourth quarters, respectively, and net derivative losses of $124.0 million during the third quarter.

122

PIONEER NATURAL RESOURCES COMPANY

UNAUDITED SUPPLEMENTARY INFORMATION

December 31, 2013, 2012 and 2011

(b) Includes the revision to the presentation of purchases and sales of third-party oil and gas from other expense to gross sales of purchased oil and gas and costs of purchased oil and gas. Revenues and costs from the purchase and sale transactions are presented on a gross basis as the Company acts as a principal in the transactions by assuming the risks and rewards of ownership, including credit risk, of the oil and gas purchased and assumes responsibility for the delivery of the oil and gas volumes sold. See Note B for additional information on purchases and sales of third-party oil and gas.

(c) During the fourth quarter of 2013, the Company's total costs and expenses include (i) charges of $1.5 billion to impair the carrying value of proved gas properties in the Raton field and (ii) charges of $48.7 million to impair the carrying value of excess materials inventory and other property and equipment held for sale.

123

ITEM 9. CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL DISCLOSURE

None.

ITEM 9A. CONTROLS AND PROCEDURES

Evaluation of disclosure controls and procedures. The Company's management, with the participation of its principal executive officer and principal financial officer, have evaluated, as required by Rule 13a-15(b) under the Securities Exchange Act of 1934 ("the Exchange Act"), the effectiveness of the Company's disclosure controls and procedures (as defined in Exchange Act Rule 13a-15(e)) as of the end of the period covered by this Report. Based on that evaluation, the principal executive officer and principal financial officer concluded that the Company's disclosure controls and procedures were effective, as of the end of the period covered by this Report, in ensuring that information required to be disclosed by the Company in the reports that it files or submits under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC's rules and forms, including that such information is accumulated and communicated to the Company's management, including the principal executive officer and principal financial officer, to allow timely decisions regarding required disclosure.

Changes in internal control over financial reporting. There have been no changes in the Company's internal control over financial reporting (as defined in Rule 13a-15(f) under the Exchange Act) that occurred during the three months ended December 31, 2013 that have materially affected, or are reasonably likely to materially affect, the Company's internal control over financial reporting.

MANAGEMENT'S REPORT ON INTERNAL CONTROL OVER FINANCIAL REPORTING

The management of the Company is responsible for establishing and maintaining adequate internal control over financial reporting. The Company's internal control over financial reporting is a process designed by or under the supervision of the Company's principal executive officer and principal financial officer and effected by the Board, management and other personnel to provide reasonable assurance regarding the reliability of financial reporting and the preparation of the Company's financial statements for external purposes in accordance with generally accepted accounting principles.

The Company's management, with the participation of its principal executive officer and principal financial officer assessed the effectiveness, as of December 31, 2013, of the Company's internal control over financial reporting based on the criteria for effective internal control over financial reporting established in "Internal Control — Integrated Framework (1992)," issued by the Committee of Sponsoring Organizations of the Treadway Commission. Based on the assessment, management determined that the Company maintained effective internal control over financial reporting at a reasonable assurance level as of December 31, 2013, based on those criteria.

Ernst & Young LLP, the independent registered public accounting firm that audited the consolidated financial statements of the Company included in this Annual Report on Form 10-K, has issued an attestation report on the effectiveness of the Company's internal control over financial reporting as of December 31, 2013. The report, which expresses an unqualified opinion on the effectiveness of the Company's internal control over financial reporting as of December 31, 2013, is included in this Item under the heading "Report of Independent Registered Public Accounting Firm."

124

REPORT OF INDEPENDENT REGISTERED PUBLIC

ACCOUNTING FIRM

The Board of Directors and Stockholders of

Pioneer Natural Resources Company

We have audited Pioneer Natural Resources Company's (the "Company") internal control over financial reporting as of December 31, 2013, based on criteria established in Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (1992 framework) (the COSO criteria). Pioneer Natural Resources Company's management is responsible for maintaining effective internal control over financial reporting, and for its assessment of the effectiveness of internal control over financial reporting included in the accompanying Management's Report on Internal Control Over Financial Reporting. Our responsibility is to express an opinion on the Company's internal control over financial reporting based on our audit.

We conducted our audit in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, testing and evaluating the design and operating effectiveness of internal control based on the assessed risk, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

A company's internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company's internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company's assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

In our opinion, Pioneer Natural Resources Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2013, based on the COSO criteria.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the consolidated balance sheets of Pioneer Natural Resources Company as of December 31, 2013 and 2012 and the related consolidated statements of operations, comprehensive income (loss), equity and cash flows for each of the three years in the period ended December 31, 2013, and our report dated February 26, 2014 expressed an unqualified opinion thereon.

/s/ Ernst & Young LLP

Dallas, Texas

February 26, 2014

125

ITEM 9B. OTHER INFORMATION

None.

PART III

ITEM 10. DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE

The information required in response to this Item will be set forth in the Company's definitive proxy statement for the annual meeting of stockholders to be held during May 2014 and is incorporated herein by reference.

ITEM 11. EXECUTIVE COMPENSATION

The information required in response to this Item will be set forth in the Company's definitive proxy statement for the annual meeting of stockholders to be held during May 2014 and is incorporated herein by reference.

ITEM 12. SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND RELATED STOCKHOLDER MATTERS

Securities Authorized for Issuance under Equity Compensation Plans

The following table summarizes information about the Company's equity compensation plans as of December 31, 2013:

	Number of securities  to be issued upon exercise of outstanding options, warrants and rights (a)	Weighted-average exercise price of outstanding options, warrants and rights		Number of securities remaining available for future issuance under equity compensation plans (excluding securities reflected in first column)
Equity compensation plans approved by security holders:
Pioneer Natural Resources Company:
2006 Long-Term Incentive Plan (b)(c)	115,290	$	26.74	2,593,429
Long-Term Incentive Plan	—	—		—
Employee Stock Purchase Plan (d)	—	—		515,028
Equity compensation plans not approved by security holders (e)	—	—		654,842
Total:	115,290	$	26.74	3,763,299

 _______________________

(a) There are no outstanding warrants or equity rights awarded under the Company's equity compensation plans. The securities listed do not include restricted stock awarded under the Company's previous Long-Term Incentive Plan and the Company's 2006 Long-Term Incentive Plan.

(b) In May 2006, the stockholders of the Company approved the 2006 Long-Term Incentive Plan, which provided for the issuance of up to 9.1 million awards, as was supplementally approved by the stockholders of the Company during May 2009. Awards under the 2006 Long-Term Incentive Plan can be in the form of stock options, stock appreciation rights, performance units, restricted stock and restricted stock units. No additional awards may be made under the prior Long-Term Incentive Plan.

(c) The number of securities remaining for future issuance has been reduced by the maximum number of shares that could be issued pursuant to outstanding grants of performance units at December 31, 2013.

(d) The number of remaining securities available for future issuance under the Company's Employee Stock Purchase Plan is based on the original authorized issuance of 750,000 shares plus an additional 500,000 shares supplementally approved less 734,972 cumulative shares issued through December 31, 2013. See Note H of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for a description of each of the Company's equity compensation plans.

126

(e) These represent awards available for issuance under the Pioneer Southwest 2008 Long-Term Incentive Plan, which was assumed by the Company as part of the Pioneer Southwest merger.

The remaining information required in response to this Item will be set forth in the Company's definitive proxy statement for the annual meeting of stockholders to be held during May 2014 and is incorporated herein by reference.

ITEM 13. CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS, AND DIRECTOR INDEPENDENCE

The information required in response to this Item will be set forth in the Company's definitive proxy statement for the annual meeting of stockholders to be held during May 2014 and is incorporated herein by reference.

ITEM 14. PRINCIPAL ACCOUNTING FEES AND SERVICES

The information required in response to this Item will be set forth in the Company's definitive proxy statement for the annual meeting of stockholders to be held during May 2014 and is incorporated herein by reference.

PART IV

ITEM 15. EXHIBITS, FINANCIAL STATEMENT SCHEDULES

(a) Listing of Financial Statements

Financial Statements

The following consolidated financial statements of the Company are included in "Item 8. Financial Statements and Supplementary Data":

• Report of Independent Registered Pubic Accounting Firm

• Consolidated Balance Sheets as of December 31, 2013 and 2012

• Consolidated Statements of Operations for the Years Ended December 31, 2013, 2012 and 2011

• Consolidated Statements of Comprehensive Income (Loss) for the Years Ended December 31, 2013, 2012 and 2011

• Consolidated Statements of Stockholders' Equity for the Years Ended December 31, 2013, 2012 and 2011

• Consolidated Statements of Cash Flows for the Years Ended December 31, 2013, 2012 and 2011

• Notes to Consolidated Financial Statements

• Unaudited Supplementary Information

(b) Exhibits

The exhibits to this Report that are required to be filed pursuant to Item 15(b) are listed below and in the "Exhibit Index" attached hereto.

(c) Financial Statement Schedules

No financial statement schedules are required to be filed as part of this Report or they are inapplicable.

127

Exhibits

Exhibit Number		Description
2.1  *	—	Agreement for the Sale and Purchase of the Entire Issued Share Capital of Pioneer Natural Resources Anaguid Ltd. and Pioneer Natural Resources Tunisia Ltd. between Pioneer Natural Resources USA, Inc. and OMV (Tunesien) Production GmbH dated January 6, 2011 (incorporated by reference to Exhibit 2.2 to the Company's Annual Report on Form 10-K for the year ended December 31, 2010, File No. 1-13245).
2.2	—	Agreement and Plan of Merger dated as of August 9, 2013, by and among the Company, Pioneer Natural Resources USA, Inc., PNR Acquisition Company, LLC, Pioneer Southwest Energy Partners L.P., and Pioneer Natural Resources GP LLC (incorporated by reference to Exhibit 2.1 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on August 12, 2013).
2.3	—	Amendment No. 1, entered into as of October 25, 2013, to the Agreement and Plan of Merger dated as of August 9, 2013, by and among the Company, Pioneer Natural Resources USA, Inc., PNR Acquisition Company, LLC, Pioneer Southwest Energy Partners L.P., and Pioneer Natural Resources GP LLC (incorporated by reference to Exhibit 2.1 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on October 31, 2013).
3.1	—	Amended and Restated Certificate of Incorporation of the Company (incorporated by reference to Exhibit 3.1 to the Company's Registration Statement on Form S-4, dated June 26, 1997, Registration No. 333-26951).
3.2	—	Certificate of Amendment of the Amended and Restated Certificate of Incorporation, effective May 18, 2012 (incorporated by reference to Exhibit 3.1 to the Company's Current Report on Form 8-K , File No. File No. 1-13245, filed with the SEC on May 18, 2012).
3.3	—	Third Amended and Restated Bylaws of the Company (incorporated by reference to Exhibit 3.2 to the Company's Current Report on Form 8-K , File No. File No. 1-13245, filed with the SEC on May 18, 2012).
4.1	—	Form of Certificate of Common Stock, par value $.01 per share, of the Company (incorporated by reference to Exhibit 4.1 to the Company's Registration Statement on Form S-4, dated June 26, 1997, Registration No. 333-26951).
4.2	—	Indenture dated January 13, 1998, between the Company and The Bank of New York, as trustee (incorporated by reference to Exhibit 99.1 to the Company's and Pioneer USA's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on January 14, 1998).
4.3	—	First Supplemental Indenture dated as of January 13, 1998, among the Company, Pioneer Natural Resources USA, Inc. and The Bank of New York, as trustee, with respect to the indenture identified above as Exhibit 4.2 (incorporated by reference to Exhibit 99.2 to the Company's and Pioneer USA's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on January 14, 1998).
4.4	—	Second Supplemental Indenture dated as of April 11, 2000, among the Company, Pioneer Natural Resources USA, Inc. and The Bank of New York, as trustee, with respect to the indenture identified above as Exhibit 4.2 (incorporated by reference to Exhibit 10.1 to the Company's Quarterly Report on Form 10-Q for the quarter ended March 31, 2000, File No. 1-13245).
4.5	—	Third Supplemental Indenture dated as of April 30, 2002, among the Company, Pioneer Natural Resources USA, Inc. and The Bank of New York, as trustee, with respect to the indenture identified above as Exhibit 4.2 (incorporated by reference to Exhibit 10.4 to the Company's Quarterly Report on Form 10-Q for the quarter ended March 31, 2002, File No. 1-13245).
4.6	—	Fourth Supplemental Indenture dated as of July 15, 2004, among the Company and The Bank of New York, as trustee, with respect to the indenture identified above as Exhibit 4.2 (incorporated by reference to Exhibit 99.1 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on July 19, 2004).
4.7	—	Fifth Supplemental Indenture dated as of July 15, 2004, among the Company, Pioneer Natural Resources USA, Inc. and The Bank of New York, as trustee, with respect to the indenture identified above as Exhibit 4.2 (incorporated by reference to Exhibit 99.2 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on July 19, 2004).
4.8	—	Sixth Supplemental Indenture, dated as of May 1, 2006, among the Company, Pioneer Natural Resources USA, Inc. and The Bank of New York Trust Company, N.A., as trustee, with respect to the indenture identified above as Exhibit 4.2 (incorporated by reference to Exhibit 4.1 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on May 4, 2006).
4.9	—	Seventh Supplemental Indenture, dated as of March 12, 2007, among the Company, Pioneer Natural Resources USA, Inc., The Bank of New York Trust Company, N.A, as original trustee under the indenture, and Wells Fargo Bank, National Association, as series trustee, with respect to the indenture identified above as Exhibit 4.2 (incorporated by reference to Exhibit 4.1 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on March 12, 2007).
4.10	—	Indenture dated January 22, 2008 between the Company and Wells Fargo Bank, National Association, as trustee (incorporated by reference to Exhibit 4.1 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on January 22, 2008).

128

4.11	—	First Supplemental Indenture dated January 22, 2008 by and among the Company, Pioneer Natural Resources USA, Inc. and Wells Fargo Bank, National Association, as trustee, with respect to the indenture identified above as Exhibit 4.10 (incorporated by reference to Exhibit 4.2 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on January 22, 2008).
4.12	—	Second Supplemental Indenture dated November 9, 2009 by and among the Company, Pioneer Natural Resources USA, Inc. and Wells Fargo Bank, National Association, as trustee, with respect to the indenture identified above as Exhibit 4.10 (incorporated by reference to Exhibit 4.1 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on November 13, 2009).
4.13	—	Indenture dated June 26, 2012 between the Company and Wells Fargo Bank, National Association, as trustee (incorporated by reference to Exhibit 4.1 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on June 28, 2012).
4.14	—	First Supplemental Indenture, dated June 26, 2012, by and among the Company, Pioneer Natural Resources USA, Inc. and Wells Fargo Bank, National Association, as trustee, with respect to the indenture identified above as Exhibit 4.13 (incorporated by reference to Exhibit 4.2 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on June 28, 2012).
10.1	—	Second Amended and Restated 5-Year Revolving Credit Agreement dated as of March 31, 2011, among the Company, as Borrower, Wells Fargo Bank, National Association, as Administrative Agent, and certain other lenders (incorporated by reference to Exhibit 10.1 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on April 5, 2011).
10.2	—	First Amendment to Second Amended and Restated 5-Year Revolving Credit Agreement dated as of December 20, 2012, among the Company, as the Borrower, Wells Fargo Bank, National Association, as Administrative Agent, and certain other lenders (incorporated by reference to Exhibit 10.1 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on December 20, 2012).
10.3 H	—	The Company's Long-Term Incentive Plan (incorporated by reference to Exhibit 4.1 to the Company's Registration Statement on Form S-8, Registration No. 333-35087, filed with the SEC on September 8, 1997).
10.4 H	—	First Amendment to the Company's Long-Term Incentive Plan, effective as of November 23, 1998 (incorporated by reference to Exhibit 10.72 to the Company's Annual Report on Form 10-K for the year ended December 31, 1999, File No. 1-13245).
10.5 H	—	Amendment No. 2 to the Company's Long-Term Incentive Plan, effective as of May 20, 1999 (incorporated by reference to Exhibit 10.73 to the Company's Annual Report on Form 10-K for the year ended December 31, 1999, File No. 1-13245).
10.6 H	—	Amendment No. 3 to the Company's Long-Term Incentive Plan, effective as of February 17, 2000 (incorporated by reference to Exhibit 10.76 to the Company's Annual Report on Form 10-K for the year ended December 31, 1999, File No. 1-13245).
10.7 H	—	Amendment No. 4 to the Company's Long-Term Incentive Plan, effective as of November 20, 2003 (incorporated by reference to Exhibit 10.5 to the Company's Quarterly Report on Form 10-Q for the quarter ended March 31, 2005, File No. 1-13245).
10.8 H	—	Amendment No. 5 to the Company's Long-Term Incentive Plan, effective as of May 12, 2004 (incorporated by reference to Exhibit 10.6 to the Company's Quarterly Report on Form 10-Q for the quarter ended March 31, 2005, File No. 1-13245).
10.9 H	—	Amendment No. 6 to the Company's Long-Term Incentive Plan, effective as of December 17, 2004 (incorporated by reference to Exhibit 10.7 to the Company's Quarterly Report on Form 10-Q for the quarter ended March 31, 2005, File No. 1-13245).
10.10 H	—	Amendment No. 7 to the Company's Long Term Incentive Plan, effective November 20, 2008 (incorporated by reference to Exhibit 10.8 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on November 25, 2008).
10.11 H	—	Form of Omnibus Nonstatutory Stock Option Agreement for Option Award Participants with respect to grants under the Company's Long-Term Incentive Plan (Group 1) (incorporated by reference to Exhibit 10.20 to the Company's Quarterly Report on Form 10-Q for the quarter ended March 31, 2005, File No. 1-13245).
10.12 H	—	Pioneer Natural Resources Company 2006 Long-Term Incentive Plan (incorporated by reference to Exhibit 10.1 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on May 9, 2006).
10.13 H	—	First Amendment to the Pioneer Natural Resources Company 2006 Long Term Incentive Plan, effective November 20, 2008 (incorporated by reference to Exhibit 10.7 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on November 25, 2008).
10.14 H	—	Second Amendment to the Pioneer Natural Resources Company 2006 Long Term Incentive Plan, effective May 28, 2009 (incorporated by reference to Exhibit 10.1 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on May 28, 2009).

129

10.15 H	—	Third Amendment to the Pioneer Natural Resources Company 2006 Long Term Incentive Plan, effective January 1, 2009 (incorporated by reference to Exhibit 10.1 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on June 18, 2009).
10.16 H	—	Fourth Amendment to the Pioneer Natural Resources Company 2006 Long Term Incentive Plan, effective January 1, 2009 (incorporated by reference to Exhibit 10.2 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on June 18, 2009).
10.17 H	—	Fifth Amendment to the Pioneer Natural Resources Company 2006 Long Term Incentive Plan, effective August 20, 2012 (incorporated by reference to Exhibit 10.34 to the Company's Annual Report on Form 10-K for the year ended December 31, 2012, File No. 1-13245).
10.18 H	—	Form of restricted stock unit Award Agreement for non-employee directors with respect to grants under the Company's 2006 Long-Term Incentive Plan, together with a schedule identifying substantially identical agreements between the Company and each of its non-employee directors identified on the schedule and identifying the material differences between each of those agreements and the filed Award Agreement (incorporated by reference to Exhibit 10.2 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on May 9, 2006).
10.19 H	—	Form of Restricted Stock Award Agreement between the Company and each of Scott D. Sheffield and Timothy L. Dove, with respect to awards made under the Company's 2006 Long-Term Incentive Plan, together with a schedule identifying other substantially identical agreements between the Company and each of its other executive officers and identifying the material differences between each of those agreements and the filed Restricted Stock Award Agreement (incorporated by reference to Exhibit 10.1 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on March 2, 2007).
10.20 H	—	Form of Performance Unit Award Agreement between the Company and each of Scott D. Sheffield and Timothy L. Dove, with respect to awards made under the Company's 2006 Long-Term Incentive Plan, together with a schedule identifying other substantially identical agreements between the Company and each of its other executive officers and identifying the material differences between each of those agreements and the filed Performance Unit Award Agreement (incorporated by reference to Exhibit 10.1 to the Company's Quarterly Report on Form 10-Q for the quarter ended March 31, 2010, File No. 1-13245).
10.21 H	—	Form of Restricted Stock Unit Agreement for Non-Employee Directors to be used in connection with annual equity awards under the Company's 2006 Long-Term Incentive Plan (incorporated by reference to Exhibit 10.1 to the Company's Quarterly Report on Form 10-Q for the quarter ended June 30, 2010, File No. 1-13245).
10.22 H	—	Form of Restricted Stock Unit Agreement between the Company and Scott D. Sheffield, with respect to awards made under the Company's 2006 Long Term Incentive Plan. (incorporated by reference to Exhibit 10.64 to the Company's Annual Report on Form 10-K for the year ended December 31, 2010, File No. 1-13245).
10.23 H	—	Form of Restricted Stock Award Agreement between the Company and Timothy L. Dove, with respect to annual awards made under the Company's 2006 Long-Term Incentive Plan, together with a schedule identifying other substantially identical agreements between the Company and each of its other executive officers who received this award and identifying the material differences between each of those agreements and the filed Restricted Stock Award Agreement (incorporated by reference to Exhibit 10.2 to the Company's Quarterly Report on Form 10-Q for the quarter ended March 31, 2012, File No. 1-13245).
10.24 H	—	Form of Nonstatutory Stock Option Agreement between the Company and each of Scott D. Sheffield and Timothy L. Dove, with respect to awards made under the Company's 2006 Long-Term Incentive Plan, together with a schedule identifying other substantially identical agreements between the Company and each of its other executive officers and identifying the material differences between each of those agreements and the filed Nonstatutory Stock Option Agreement (incorporated by reference to Exhibit 10.5 to the Company's Quarterly Report on Form 10-Q for the quarter ended March 31, 2012, File No. 1-13245).
10.25 H	—	Form of Performance Unit Award Agreement between the Company and each of Scott D. Sheffield and Timothy L. Dove, with respect to awards made under the Company's 2006 Long-Term Incentive Plan, together with a schedule identifying other substantially identical agreements between the Company and each of its other executive officers and identifying the material differences between each of those agreements and the filed Performance Unit Award Agreement (incorporated by reference to Exhibit 10.3 to the Company's Quarterly Report on Form 10-Q for the quarter ended March 31, 2012, File No. 1-13245).
10.26 H	—	Form of Restricted Stock Unit Agreement between the Company and Scott D. Sheffield, with respect to annual awards made under the Company's 2006 Long Term Incentive Plan together with a schedule identifying other substantially identical agreements between the Company and each of its other executive officers who received this award and identifying the material differences between each of those agreements and the filed Restricted Stock Unit Agreement (incorporated by reference to Exhibit 10.4 to the Company's Quarterly Report on Form 10-Q for the quarter ended March 31, 2012, File No. 1-13245).
10.27 H	—	Form of Restricted Stock Award Agreement between the Company and executive officers of the Company with respect to retention awards made under the Company's 2006 Long-Term Incentive Plan (incorporated by reference to Exhibit 10.6 to the Company's Quarterly Report on Form 10-Q for the quarter ended March 31, 2012, File No. 1-13245).

130

10.28 H	—	Form of Restricted Stock Unit Award Agreement between the Company and executive officers of the Company with respect to retention awards made under the Company's 2006 Long-Term Incentive Plan (incorporated by reference to Exhibit 10.7 to the Company's Quarterly Report on Form 10-Q for the quarter ended March 31, 2012, File No. 1-13245).
10.29 H	—	Pioneer Natural Resources Company Employee Stock Purchase Plan, as amended and restated, effective September 1, 2007 (incorporated by reference to Exhibit 10.1 to the Company's Quarterly Report on Form 10-Q for the quarter ended June 30, 2007, File No. 1-13245).
10.30 H	—	First Amendment to Amended and Restated Pioneer Natural Resources Company Employee Stock Purchase Plan, effective September 1, 2012 (incorporated by reference to Exhibit 10.1 to the Company's Current Report on Form 8-K, File No. File No. 1-13245, filed with the SEC on May 18, 2012).
10.31 H	—	The Company's Executive Deferred Compensation Plan, Amended and Restated, effective as of August 1, 2002 (incorporated by reference to Exhibit 10.15 to the Company's Quarterly Report on Form 10-Q for the quarter ended March 31, 2005, File No. 1-13245).
10.32 H	—	Amendment No. 1 to the Company's Executive Deferred Compensation Plan, effective as of January 1, 2007 (incorporated by reference to Exhibit 10.15 to the Company's Annual Report on Form 10-K for the year ended December 31, 2006, File No. 1-13245).
10.33 H	—	Amended and Restated Executive Deferred Compensation Plan, effective as of January 1, 2009 (incorporated by reference to Exhibit 10.6 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on November 25, 2008).
10.34 H	—	Amendment No. 1 to the Company's Amended and Restated Executive Deferred Compensation Plan, effective January 1, 2009 (incorporated by reference to Exhibit 10.4 to the Company's Quarterly Report on Form 10-Q for the quarter ended June 30, 2009, File No. 1-13245).
10.35 H	—	Amendment No. 2 to the Company's Amended and Restated Executive Deferred Compensation Plan, effective January 1, 2011 (incorporated by reference to Exhibit 10.56 to the Company's Annual Report on Form 10-K for the year ended December 31, 2010, File No. 1-13245).
10.36 H (a)	—	Amendment No. 3 to the Company's Amended and Restated Executive Deferred Compensation Plan, executed August 19, 2013 and effective January 1, 2009.
10.37 H (a)	—	Amendment No. 4 to the Company's Amended and Restated Executive Deferred Compensation Plan, effective January 1, 2014.
10.38 H (a)	—	Pioneer USA 401(k) and Matching Plan, Amended and Restated, effective as of January 1, 2013.
10.39 H	—	Indemnification Agreement between the Company and Scott D. Sheffield, together with a schedule identifying other substantially identical agreements between the Company and each of its executive officers identified on the schedule and identifying the material differences between each of those agreements and the filed Indemnification Agreement (incorporated by reference to Exhibit 10.2 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on March 8, 2013).
10.40 H	—	Indemnification Agreement, dated February 21, 2013, between the Company and Thomas D. Arthur, together with a schedule identifying other substantially identical agreements between the Company and each of the other non-employee directors identified on the schedule (incorporated by reference to Exhibit 10.1 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on February 26, 2013).
10.41 H	—	Indemnification Agreement, dated effective July 23, 2013, between the Company and Stacy P. Methvin, together with a schedule identifying other substantially identical agreements between the Company and each of the other non-employee directors identified on the schedule (incorporated by reference to Exhibit 10.1 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on July 29, 2013).
10.42 H	—	Severance Agreement dated August 16, 2005, between the Company and Scott D. Sheffield, together with a schedule identifying other substantially identical agreements between the Company and each of its executive officers identified on the schedule and identifying the material differences between each of those agreements and the filed Severance Agreement (incorporated by reference to Exhibit 10.24 to the Company's Annual Report on Form 10-K for the year ended December 31, 2007, File No. 1-13245).
10.43 H	—	Severance Agreement, dated May 19, 2008, between the Company and Frank W. Hall (incorporated by reference to Exhibit 10.2 to the Company's Quarterly Report on Form 10-Q for the quarter ended June 30, 2008, File No. 1-13245).
10.44 H	—	Form of Amendment to Severance Agreement dated November 20, 2008, between the Company and each of Scott D. Sheffield and Timothy L. Dove (incorporated by reference to Exhibit 10.1 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on November 25, 2008).
10.45 H	—	Form of Amendment to Severance Agreement dated November 20, 2008, between the Company and each executive officer of the Company other than Scott D. Sheffield and Timothy L. Dove (incorporated by reference to Exhibit 10.2 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on November 25, 2008).

131

10.46 H	—	Change in Control Agreement, dated March 4, 2013, between the Company and Scott D. Sheffield, together with a schedule identifying other substantially identical agreements between the Company and each of its executive officers identified on the schedule and identifying the material differences between each of those agreements and the filed Change in Control Agreement (incorporated by reference to Exhibit 10.1 to the Company's Quarterly Report on Form 10-Q for the quarter ended March 31, 2013, File No. 1-13245).
10.47 H	—	Pioneer Natural Resources Company 2006 Long-Term Incentive Plan (incorporated by reference to Exhibit 10.1 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on May 9, 2006).
10.48 H	—	First Amendment to the Pioneer Natural Resources Company 2006 Long Term Incentive Plan effective November 20, 2008 (incorporated by reference to Exhibit 10.7 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on November 25, 2008).
10.49 H	—	Second Amendment to the Pioneer Natural Resources Company 2006 Long Term Incentive Plan effective May 28, 2009 (incorporated by reference to Exhibit 10.1 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on May 28, 2009).
10.50 H	—	Third Amendment to the Pioneer Natural Resources Company 2006 Long Term Incentive Plan effective January 1, 2009 (incorporated by reference to Exhibit 10.1 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on June 18, 2009).
10.51 H	—	Fourth Amendment to the Pioneer Natural Resources Company 2006 Long Term Incentive Plan effective January 1, 2009 (incorporated by reference to Exhibit 10.2 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on June 18, 2009).
10.52 H	—	Fifth Amendment to the Pioneer Natural Resources Company 2006 Long Term Incentive Plan effective August 20, 2012.
10.53 H	—	Form of restricted stock unit Award Agreement for non-employee directors with respect to grants under the Company's 2006 Long-Term Incentive Plan, together with a schedule identifying substantially identical agreements between the Company and each of its non-employee directors identified on the schedule and identifying the material differences between each of those agreements and the filed Award Agreement (incorporated by reference to Exhibit 10.2 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on May 9, 2006).
10.54 H	—	Form of Restricted Stock Unit Agreement for Non-Employee Directors to be used in connection with annual equity awards under the Company's 2006 Long-Term Incentive Plan (incorporated by reference to Exhibit 10.1 to the Company's Quarterly Report on Form 10-Q for the quarter ended June 30, 2010, File No. 1-13245).
10.55 H	—	Form of Restricted Stock Award Agreement between the Company and each of Scott D. Sheffield and Timothy L. Dove, with respect to awards made under the Company's 2006 Long-Term Incentive Plan, together with a schedule identifying other substantially identical agreements between the Company and each of its other executive officers and identifying the material differences between each of those agreements and the filed Restricted Stock Award Agreement (incorporated by reference to Exhibit 10.1 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on March 2, 2007).
10.56	—	First Amended and Restated Agreement of Limited Partnership of Pioneer Southwest Energy Partners L.P. dated May 6, 2008, between Pioneer Natural Resources GP LLC, as the General Partner, and Pioneer Natural Resources USA, Inc., as the Organizational Limited Partner, together with any other persons who become Partners (as defined in such agreement) in the Partnership (incorporated by reference to Exhibit 3.1 to the Current Report on Form 8-K of Pioneer Southwest Energy Partners L.P., File No. 001-34032, filed with the SEC on May 9, 2008).
10.57	—	Administrative Services Agreement, dated effective May 6, 2008, among Pioneer Natural Resources GP LLC, Pioneer Southwest Energy Partners L.P., Pioneer Southwest Energy Partners USA LLC, and Pioneer Natural Resources USA, Inc. (incorporated by reference to Exhibit 10.2 to the Current Report on Form 8-K, of Pioneer Southwest Energy Partners L.P., File No. 001-34032, filed with the SEC on May 9, 2008).
10.58	—	Amended and Restated Credit Agreement entered into as of March 29, 2012, among Pioneer Southwest Energy Partners L.P., as the Borrower, Bank of America, N.A., as Administrative Agent, and certain other lenders (incorporated by reference to Exhibit 10.1 to the Current Report on Form 8-K of Pioneer Southwest Energy Partners L.P., File No. 001-34032, filed with the SEC on April 3, 2012).
10.59	—	Voting Agreement dated as of August 9, 2013, by and among the Company, Pioneer Natural Resources USA, Inc., PNR Acquisition Company, LLC, Pioneer Southwest Energy Partners L.P., and Pioneer Natural Resources GP LLC (incorporated by reference to Exhibit 10.1 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on August 12, 2013).
10.60 H	—	Pioneer Southwest Energy Partners L.P. 2008 Long Term Incentive Plan (now known as the Pioneer 2008 PSE Employee Long Term Incentive Plan) (incorporated by reference to Exhibit 10.1 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on December 17, 2013).
10.61 H	—	First Amendment to Pioneer 2008 PSE Employee Long Term Incentive Plan (incorporated by reference to Exhibit 10.2 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on December 17, 2013).

132

10.62 H	—	Form of Phantom Unit Award Agreement between the General Partner of Pioneer Southwest Energy Partners L.P. and Scott D. Sheffield, with respect to awards of phantom units made under the Pioneer 2008 PSE Employee Long Term Incentive Plan, together with a schedule identifying other substantially identical agreements between the General Partner and each of its other recipients of phantom unit awards and identifying the material differences between those agreements and the filed Phantom Unit Award Agreement (incorporated by reference to Exhibit 10.1 to Pioneer Southwest Energy Partners L.P.'s Current Report on Form 8-K, File No. 001-34032, filed with the SEC on March 9, 2010).
12.1  (a)	—	Computation of Ratios of Earnings to Fixed Charges and Earnings to Fixed Charges and Preferred Stock Dividends.
21.1  (a)	—	Subsidiaries of the registrant.
23.1  (a)	—	Consent of Ernst & Young LLP.
23.2  (a)	—	Consent of Netherland, Sewell & Associates, Inc.
23.3  (a)	—	Consent of Ryder Scott Company, L.P.
31.1  (a)	—	Chief Executive Officer certification under Section 302 of the Sarbanes-Oxley Act of 2002.
31.2  (a)	—	Chief Financial Officer certification under Section 302 of the Sarbanes-Oxley Act of 2002.
32.1  (b)	—	Chief Executive Officer certification under Section 906 of the Sarbanes-Oxley Act of 2002.
32.2  (b)	—	Chief Financial Officer certification under Section 906 of the Sarbanes-Oxley Act of 2002.
95.1 (a)	—	Mine Safety Disclosure pursuant to Section 1503(a) of the Dodd-Frank Wall Street Reform and Consumer Protection Act.
99.1  (a)	—	Report of Netherland, Sewell & Associates, Inc.
101. INS  (a)	—	XBRL Instance Document.
101. SCH  (a)	—	XBRL Taxonomy Extension Schema.
101. CAL  (a)	—	XBRL Taxonomy Extension Calculation Linkbase Document.
101. DEF  (a)	—	XBRL Taxonomy Extension Definition Linkbase Document.
101. LAB  (a)	—	XBRL Taxonomy Extension Label Linkbase Document.
101. PRE  (a)	—	XBRL Taxonomy Extension Presentation Linkbase Document.

 __________________________

(a)	Filed herewith.
(b)	Furnished herewith.
H	Executive Compensation Plan or Arrangement.
*	Pursuant to the rules of the Commission, certain of the schedules and similar attachments to the Agreement have not been filed. The registrant agrees to furnish supplementally a copy of any omitted schedule to the Commission upon request.

133

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

		PIONEER NATURAL RESOURCES COMPANY
Date:	February 26, 2014
		By:	/s/ Scott D. Sheffield
			Scott D. Sheffield, Chairman of the Board and Chief Executive Officer

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.

134

Signature	Title	Date
/s/ Scott D. Sheffield	Chairman of the Board and Chief Executive Officer (principal executive officer)	February 26, 2014
Scott D. Sheffield
/s/ Timothy L. Dove	President, Chief Operating Officer and Director	February 26, 2014
Timothy L. Dove
/s/ Richard P. Dealy	Executive Vice President and Chief Financial Officer (principal financial officer)	February 26, 2014
Richard P. Dealy
/s/ Frank W. Hall	Vice President and Chief Accounting Officer (principal accounting officer)	February 26, 2014
Frank W. Hall
/s/ Thomas D. Arthur	Director	February 26, 2014
Thomas D. Arthur
/s/ Edison C. Buchanan	Director	February 26, 2014
Edison C. Buchanan
/s/ Andrew F. Cates	Director	February 26, 2014
Andrew F. Cates
/s/ R. Hartwell Gardner	Director	February 26, 2014
R. Hartwell Gardner
/s/ Larry R. Grillot	Director	February 26, 2014
Larry R. Grillot
/s/ Stacy P. Methvin	Director	February 26, 2014
Stacy P. Methvin
/s/ Charles E. Ramsey, Jr.	Director	February 26, 2014
Charles E. Ramsey, Jr.
/s/ Frank A. Risch	Director	February 26, 2014
Frank A. Risch
/s/ J. Kenneth Thompson	Director	February 26, 2014
J. Kenneth Thompson
/s/ Jim A. Watson	Director	February 26, 2014
Jim A. Watson
/s/ Phoebe A. Wood	Director	February 26, 2014
Phoebe A. Wood

135

Exhibit Index

Exhibit Number		Description
2.1  *	—	Agreement for the Sale and Purchase of the Entire Issued Share Capital of Pioneer Natural Resources Anaguid Ltd. and Pioneer Natural Resources Tunisia Ltd. between Pioneer Natural Resources USA, Inc. and OMV (Tunesien) Production GmbH dated January 6, 2011 (incorporated by reference to Exhibit 2.2 to the Company's Annual Report on Form 10-K for the year ended December 31, 2010, File No. 1-13245).
2.2	—	Agreement and Plan of Merger dated as of August 9, 2013, by and among the Company, Pioneer Natural Resources USA, Inc., PNR Acquisition Company, LLC, Pioneer Southwest Energy Partners L.P., and Pioneer Natural Resources GP LLC (incorporated by reference to Exhibit 2.1 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on August 12, 2013).
2.3	—	Amendment No. 1, entered into as of October 25, 2013, to the Agreement and Plan of Merger dated as of August 9, 2013, by and among the Company, Pioneer Natural Resources USA, Inc., PNR Acquisition Company, LLC, Pioneer Southwest Energy Partners L.P., and Pioneer Natural Resources GP LLC (incorporated by reference to Exhibit 2.1 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on October 31, 2013).
3.1	—	Amended and Restated Certificate of Incorporation of the Company (incorporated by reference to Exhibit 3.1 to the Company's Registration Statement on Form S-4, dated June 26, 1997, Registration No. 333-26951).
3.2	—	Certificate of Amendment of the Amended and Restated Certificate of Incorporation, effective May 18, 2012 (incorporated by reference to Exhibit 3.1 to the Company's Current Report on Form 8-K , File No. File No. 1-13245, filed with the SEC on May 18, 2012).
3.3	—	Third Amended and Restated Bylaws of the Company (incorporated by reference to Exhibit 3.2 to the Company's Current Report on Form 8-K , File No. File No. 1-13245, filed with the SEC on May 18, 2012).
4.1	—	Form of Certificate of Common Stock, par value $.01 per share, of the Company (incorporated by reference to Exhibit 4.1 to the Company's Registration Statement on Form S-4, dated June 26, 1997, Registration No. 333-26951).
4.2	—	Indenture dated January 13, 1998, between the Company and The Bank of New York, as trustee (incorporated by reference to Exhibit 99.1 to the Company's and Pioneer USA's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on January 14, 1998).
4.3	—	First Supplemental Indenture dated as of January 13, 1998, among the Company, Pioneer Natural Resources USA, Inc. and The Bank of New York, as trustee, with respect to the indenture identified above as Exhibit 4.2 (incorporated by reference to Exhibit 99.2 to the Company's and Pioneer USA's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on January 14, 1998).
4.4	—	Second Supplemental Indenture dated as of April 11, 2000, among the Company, Pioneer Natural Resources USA, Inc. and The Bank of New York, as trustee, with respect to the indenture identified above as Exhibit 4.2 (incorporated by reference to Exhibit 10.1 to the Company's Quarterly Report on Form 10-Q for the quarter ended March 31, 2000, File No. 1-13245).
4.5	—	Third Supplemental Indenture dated as of April 30, 2002, among the Company, Pioneer Natural Resources USA, Inc. and The Bank of New York, as trustee, with respect to the indenture identified above as Exhibit 4.2 (incorporated by reference to Exhibit 10.4 to the Company's Quarterly Report on Form 10-Q for the quarter ended March 31, 2002, File No. 1-13245).
4.6	—	Fourth Supplemental Indenture dated as of July 15, 2004, among the Company and The Bank of New York, as trustee, with respect to the indenture identified above as Exhibit 4.2 (incorporated by reference to Exhibit 99.1 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on July 19, 2004).
4.7	—	Fifth Supplemental Indenture dated as of July 15, 2004, among the Company, Pioneer Natural Resources USA, Inc. and The Bank of New York, as trustee, with respect to the indenture identified above as Exhibit 4.2 (incorporated by reference to Exhibit 99.2 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on July 19, 2004).
4.8	—	Sixth Supplemental Indenture, dated as of May 1, 2006, among the Company, Pioneer Natural Resources USA, Inc. and The Bank of New York Trust Company, N.A., as trustee, with respect to the indenture identified above as Exhibit 4.2 (incorporated by reference to Exhibit 4.1 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on May 4, 2006).
4.9	—	Seventh Supplemental Indenture, dated as of March 12, 2007, among the Company, Pioneer Natural Resources USA, Inc., The Bank of New York Trust Company, N.A, as original trustee under the indenture, and Wells Fargo Bank, National Association, as series trustee, with respect to the indenture identified above as Exhibit 4.2 (incorporated by reference to Exhibit 4.1 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on March 12, 2007).
4.10	—	Indenture dated January 22, 2008 between the Company and Wells Fargo Bank, National Association, as trustee (incorporated by reference to Exhibit 4.1 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on January 22, 2008).

136

4.11	—	First Supplemental Indenture dated January 22, 2008 by and among the Company, Pioneer Natural Resources USA, Inc. and Wells Fargo Bank, National Association, as trustee, with respect to the indenture identified above as Exhibit 4.10 (incorporated by reference to Exhibit 4.2 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on January 22, 2008).
4.12	—	Second Supplemental Indenture dated November 9, 2009 by and among the Company, Pioneer Natural Resources USA, Inc. and Wells Fargo Bank, National Association, as trustee, with respect to the indenture identified above as Exhibit 4.10 (incorporated by reference to Exhibit 4.1 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on November 13, 2009).
4.13	—	Indenture dated June 26, 2012 between the Company and Wells Fargo Bank, National Association, as trustee (incorporated by reference to Exhibit 4.1 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on June 28, 2012).
4.14	—	First Supplemental Indenture, dated June 26, 2012, by and among the Company, Pioneer Natural Resources USA, Inc. and Wells Fargo Bank, National Association, as trustee, with respect to the indenture identified above as Exhibit 4.13 (incorporated by reference to Exhibit 4.2 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on June 28, 2012).
10.1	—	Second Amended and Restated 5-Year Revolving Credit Agreement dated as of March 31, 2011, among the Company, as Borrower, Wells Fargo Bank, National Association, as Administrative Agent, and certain other lenders (incorporated by reference to Exhibit 10.1 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on April 5, 2011).
10.2	—	First Amendment to Second Amended and Restated 5-Year Revolving Credit Agreement dated as of December 20, 2012, among the Company, as the Borrower, Wells Fargo Bank, National Association, as Administrative Agent, and certain other lenders (incorporated by reference to Exhibit 10.1 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on December 20, 2012).
10.3 H	—	The Company's Long-Term Incentive Plan (incorporated by reference to Exhibit 4.1 to the Company's Registration Statement on Form S-8, Registration No. 333-35087, filed with the SEC on September 8, 1997).
10.4 H	—	First Amendment to the Company's Long-Term Incentive Plan, effective as of November 23, 1998 (incorporated by reference to Exhibit 10.72 to the Company's Annual Report on Form 10-K for the year ended December 31, 1999, File No. 1-13245).
10.5 H	—	Amendment No. 2 to the Company's Long-Term Incentive Plan, effective as of May 20, 1999 (incorporated by reference to Exhibit 10.73 to the Company's Annual Report on Form 10-K for the year ended December 31, 1999, File No. 1-13245).
10.6 H	—	Amendment No. 3 to the Company's Long-Term Incentive Plan, effective as of February 17, 2000 (incorporated by reference to Exhibit 10.76 to the Company's Annual Report on Form 10-K for the year ended December 31, 1999, File No. 1-13245).
10.7 H	—	Amendment No. 4 to the Company's Long-Term Incentive Plan, effective as of November 20, 2003 (incorporated by reference to Exhibit 10.5 to the Company's Quarterly Report on Form 10-Q for the quarter ended March 31, 2005, File No. 1-13245).
10.8 H	—	Amendment No. 5 to the Company's Long-Term Incentive Plan, effective as of May 12, 2004 (incorporated by reference to Exhibit 10.6 to the Company's Quarterly Report on Form 10-Q for the quarter ended March 31, 2005, File No. 1-13245).
10.9 H	—	Amendment No. 6 to the Company's Long-Term Incentive Plan, effective as of December 17, 2004 (incorporated by reference to Exhibit 10.7 to the Company's Quarterly Report on Form 10-Q for the quarter ended March 31, 2005, File No. 1-13245).
10.10 H	—	Amendment No. 7 to the Company's Long Term Incentive Plan, effective November 20, 2008 (incorporated by reference to Exhibit 10.8 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on November 25, 2008).
10.11 H	—	Form of Omnibus Nonstatutory Stock Option Agreement for Option Award Participants with respect to grants under the Company's Long-Term Incentive Plan (Group 1) (incorporated by reference to Exhibit 10.20 to the Company's Quarterly Report on Form 10-Q for the quarter ended March 31, 2005, File No. 1-13245).
10.12 H	—	Pioneer Natural Resources Company 2006 Long-Term Incentive Plan (incorporated by reference to Exhibit 10.1 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on May 9, 2006).
10.13 H	—	First Amendment to the Pioneer Natural Resources Company 2006 Long Term Incentive Plan, effective November 20, 2008 (incorporated by reference to Exhibit 10.7 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on November 25, 2008).
10.14 H	—	Second Amendment to the Pioneer Natural Resources Company 2006 Long Term Incentive Plan, effective May 28, 2009 (incorporated by reference to Exhibit 10.1 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on May 28, 2009).

137

10.15 H	—	Third Amendment to the Pioneer Natural Resources Company 2006 Long Term Incentive Plan, effective January 1, 2009 (incorporated by reference to Exhibit 10.1 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on June 18, 2009).
10.16 H	—	Fourth Amendment to the Pioneer Natural Resources Company 2006 Long Term Incentive Plan, effective January 1, 2009 (incorporated by reference to Exhibit 10.2 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on June 18, 2009).
10.17 H	—	Fifth Amendment to the Pioneer Natural Resources Company 2006 Long Term Incentive Plan, effective August 20, 2012 (incorporated by reference to Exhibit 10.34 to the Company's Annual Report on Form 10-K for the year ended December 31, 2012, File No. 1-13245).
10.18 H	—	Form of restricted stock unit Award Agreement for non-employee directors with respect to grants under the Company's 2006 Long-Term Incentive Plan, together with a schedule identifying substantially identical agreements between the Company and each of its non-employee directors identified on the schedule and identifying the material differences between each of those agreements and the filed Award Agreement (incorporated by reference to Exhibit 10.2 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on May 9, 2006).
10.19 H	—	Form of Restricted Stock Award Agreement between the Company and each of Scott D. Sheffield and Timothy L. Dove, with respect to awards made under the Company's 2006 Long-Term Incentive Plan, together with a schedule identifying other substantially identical agreements between the Company and each of its other executive officers and identifying the material differences between each of those agreements and the filed Restricted Stock Award Agreement (incorporated by reference to Exhibit 10.1 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on March 2, 2007).
10.20 H	—	Form of Performance Unit Award Agreement between the Company and each of Scott D. Sheffield and Timothy L. Dove, with respect to awards made under the Company's 2006 Long-Term Incentive Plan, together with a schedule identifying other substantially identical agreements between the Company and each of its other executive officers and identifying the material differences between each of those agreements and the filed Performance Unit Award Agreement (incorporated by reference to Exhibit 10.1 to the Company's Quarterly Report on Form 10-Q for the quarter ended March 31, 2010, File No. 1-13245).
10.21 H	—	Form of Restricted Stock Unit Agreement for Non-Employee Directors to be used in connection with annual equity awards under the Company's 2006 Long-Term Incentive Plan (incorporated by reference to Exhibit 10.1 to the Company's Quarterly Report on Form 10-Q for the quarter ended June 30, 2010, File No. 1-13245).
10.22 H	—	Form of Restricted Stock Unit Agreement between the Company and Scott D. Sheffield, with respect to awards made under the Company's 2006 Long Term Incentive Plan. (incorporated by reference to Exhibit 10.64 to the Company's Annual Report on Form 10-K for the year ended December 31, 2010, File No. 1-13245).
10.23 H	—	Form of Restricted Stock Award Agreement between the Company and Timothy L. Dove, with respect to annual awards made under the Company's 2006 Long-Term Incentive Plan, together with a schedule identifying other substantially identical agreements between the Company and each of its other executive officers who received this award and identifying the material differences between each of those agreements and the filed Restricted Stock Award Agreement (incorporated by reference to Exhibit 10.2 to the Company's Quarterly Report on Form 10-Q for the quarter ended March 31, 2012, File No. 1-13245).
10.24 H	—	Form of Nonstatutory Stock Option Agreement between the Company and each of Scott D. Sheffield and Timothy L. Dove, with respect to awards made under the Company's 2006 Long-Term Incentive Plan, together with a schedule identifying other substantially identical agreements between the Company and each of its other executive officers and identifying the material differences between each of those agreements and the filed Nonstatutory Stock Option Agreement (incorporated by reference to Exhibit 10.5 to the Company's Quarterly Report on Form 10-Q for the quarter ended March 31, 2012, File No. 1-13245).
10.25 H	—	Form of Performance Unit Award Agreement between the Company and each of Scott D. Sheffield and Timothy L. Dove, with respect to awards made under the Company's 2006 Long-Term Incentive Plan, together with a schedule identifying other substantially identical agreements between the Company and each of its other executive officers and identifying the material differences between each of those agreements and the filed Performance Unit Award Agreement (incorporated by reference to Exhibit 10.3 to the Company's Quarterly Report on Form 10-Q for the quarter ended March 31, 2012, File No. 1-13245).
10.26 H	—	Form of Restricted Stock Unit Agreement between the Company and Scott D. Sheffield, with respect to annual awards made under the Company's 2006 Long Term Incentive Plan together with a schedule identifying other substantially identical agreements between the Company and each of its other executive officers who received this award and identifying the material differences between each of those agreements and the filed Restricted Stock Unit Agreement (incorporated by reference to Exhibit 10.4 to the Company's Quarterly Report on Form 10-Q for the quarter ended March 31, 2012, File No. 1-13245).
10.27 H	—	Form of Restricted Stock Award Agreement between the Company and executive officers of the Company with respect to retention awards made under the Company's 2006 Long-Term Incentive Plan (incorporated by reference to Exhibit 10.6 to the Company's Quarterly Report on Form 10-Q for the quarter ended March 31, 2012, File No. 1-13245).

138

10.28 H	—	Form of Restricted Stock Unit Award Agreement between the Company and executive officers of the Company with respect to retention awards made under the Company's 2006 Long-Term Incentive Plan (incorporated by reference to Exhibit 10.7 to the Company's Quarterly Report on Form 10-Q for the quarter ended March 31, 2012, File No. 1-13245).
10.29 H	—	Pioneer Natural Resources Company Employee Stock Purchase Plan, as amended and restated, effective September 1, 2007 (incorporated by reference to Exhibit 10.1 to the Company's Quarterly Report on Form 10-Q for the quarter ended June 30, 2007, File No. 1-13245).
10.30 H	—	First Amendment to Amended and Restated Pioneer Natural Resources Company Employee Stock Purchase Plan, effective September 1, 2012 (incorporated by reference to Exhibit 10.1 to the Company's Current Report on Form 8-K, File No. File No. 1-13245, filed with the SEC on May 18, 2012).
10.31 H	—	The Company's Executive Deferred Compensation Plan, Amended and Restated, effective as of August 1, 2002 (incorporated by reference to Exhibit 10.15 to the Company's Quarterly Report on Form 10-Q for the quarter ended March 31, 2005, File No. 1-13245).
10.32 H	—	Amendment No. 1 to the Company's Executive Deferred Compensation Plan, effective as of January 1, 2007 (incorporated by reference to Exhibit 10.15 to the Company's Annual Report on Form 10-K for the year ended December 31, 2006, File No. 1-13245).
10.33 H	—	Amended and Restated Executive Deferred Compensation Plan, effective as of January 1, 2009 (incorporated by reference to Exhibit 10.6 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on November 25, 2008).
10.34 H	—	Amendment No. 1 to the Company's Amended and Restated Executive Deferred Compensation Plan, effective January 1, 2009 (incorporated by reference to Exhibit 10.4 to the Company's Quarterly Report on Form 10-Q for the quarter ended June 30, 2009, File No. 1-13245).
10.35 H	—	Amendment No. 2 to the Company's Amended and Restated Executive Deferred Compensation Plan, effective January 1, 2011 (incorporated by reference to Exhibit 10.56 to the Company's Annual Report on Form 10-K for the year ended December 31, 2010, File No. 1-13245).
10.36 H (a)	—	Amendment No. 3 to the Company's Amended and Restated Executive Deferred Compensation Plan, executed August 19, 2013 and effective January 1, 2009.
10.37 H (a)	—	Amendment No. 4 to the Company's Amended and Restated Executive Deferred Compensation Plan, effective January 1, 2014.
10.38 H (a)	—	Pioneer USA 401(k) and Matching Plan, Amended and Restated, effective as of January 1, 2013.
10.39 H	—	Indemnification Agreement between the Company and Scott D. Sheffield, together with a schedule identifying other substantially identical agreements between the Company and each of its executive officers identified on the schedule and identifying the material differences between each of those agreements and the filed Indemnification Agreement (incorporated by reference to Exhibit 10.2 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on March 8, 2013).
10.40 H	—	Indemnification Agreement, dated February 21, 2013, between the Company and Thomas D. Arthur, together with a schedule identifying other substantially identical agreements between the Company and each of the other non-employee directors identified on the schedule (incorporated by reference to Exhibit 10.1 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on February 26, 2013).
10.41 H	—	Indemnification Agreement, dated effective July 23, 2013, between the Company and Stacy P. Methvin, together with a schedule identifying other substantially identical agreements between the Company and each of the other non-employee directors identified on the schedule (incorporated by reference to Exhibit 10.1 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on July 29, 2013).
10.42 H	—	Severance Agreement dated August 16, 2005, between the Company and Scott D. Sheffield, together with a schedule identifying other substantially identical agreements between the Company and each of its executive officers identified on the schedule and identifying the material differences between each of those agreements and the filed Severance Agreement (incorporated by reference to Exhibit 10.24 to the Company's Annual Report on Form 10-K for the year ended December 31, 2007, File No. 1-13245).
10.43 H	—	Severance Agreement, dated May 19, 2008, between the Company and Frank W. Hall (incorporated by reference to Exhibit 10.2 to the Company's Quarterly Report on Form 10-Q for the quarter ended June 30, 2008, File No. 1-13245).
10.44 H	—	Form of Amendment to Severance Agreement dated November 20, 2008, between the Company and each of Scott D. Sheffield and Timothy L. Dove (incorporated by reference to Exhibit 10.1 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on November 25, 2008).
10.45 H	—	Form of Amendment to Severance Agreement dated November 20, 2008, between the Company and each executive officer of the Company other than Scott D. Sheffield and Timothy L. Dove (incorporated by reference to Exhibit 10.2 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on November 25, 2008).

139

10.46 H	—	Change in Control Agreement, dated March 4, 2013, between the Company and Scott D. Sheffield, together with a schedule identifying other substantially identical agreements between the Company and each of its executive officers identified on the schedule and identifying the material differences between each of those agreements and the filed Change in Control Agreement (incorporated by reference to Exhibit 10.1 to the Company's Quarterly Report on Form 10-Q for the quarter ended March 31, 2013, File No. 1-13245).
10.47 H	—	Pioneer Natural Resources Company 2006 Long-Term Incentive Plan (incorporated by reference to Exhibit 10.1 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on May 9, 2006).
10.48 H	—	First Amendment to the Pioneer Natural Resources Company 2006 Long Term Incentive Plan effective November 20, 2008 (incorporated by reference to Exhibit 10.7 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on November 25, 2008).
10.49 H	—	Second Amendment to the Pioneer Natural Resources Company 2006 Long Term Incentive Plan effective May 28, 2009 (incorporated by reference to Exhibit 10.1 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on May 28, 2009).
10.50 H	—	Third Amendment to the Pioneer Natural Resources Company 2006 Long Term Incentive Plan effective January 1, 2009 (incorporated by reference to Exhibit 10.1 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on June 18, 2009).
10.51 H	—	Fourth Amendment to the Pioneer Natural Resources Company 2006 Long Term Incentive Plan effective January 1, 2009 (incorporated by reference to Exhibit 10.2 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on June 18, 2009).
10.52 H	—	Fifth Amendment to the Pioneer Natural Resources Company 2006 Long Term Incentive Plan effective August 20, 2012.
10.53 H	—	Form of restricted stock unit Award Agreement for non-employee directors with respect to grants under the Company's 2006 Long-Term Incentive Plan, together with a schedule identifying substantially identical agreements between the Company and each of its non-employee directors identified on the schedule and identifying the material differences between each of those agreements and the filed Award Agreement (incorporated by reference to Exhibit 10.2 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on May 9, 2006).
10.54 H	—	Form of Restricted Stock Unit Agreement for Non-Employee Directors to be used in connection with annual equity awards under the Company's 2006 Long-Term Incentive Plan (incorporated by reference to Exhibit 10.1 to the Company's Quarterly Report on Form 10-Q for the quarter ended June 30, 2010, File No. 1-13245).
10.55 H	—	Form of Restricted Stock Award Agreement between the Company and each of Scott D. Sheffield and Timothy L. Dove, with respect to awards made under the Company's 2006 Long-Term Incentive Plan, together with a schedule identifying other substantially identical agreements between the Company and each of its other executive officers and identifying the material differences between each of those agreements and the filed Restricted Stock Award Agreement (incorporated by reference to Exhibit 10.1 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on March 2, 2007).
10.56	—	First Amended and Restated Agreement of Limited Partnership of Pioneer Southwest Energy Partners L.P. dated May 6, 2008, between Pioneer Natural Resources GP LLC, as the General Partner, and Pioneer Natural Resources USA, Inc., as the Organizational Limited Partner, together with any other persons who become Partners (as defined in such agreement) in the Partnership (incorporated by reference to Exhibit 3.1 to the Current Report on Form 8-K of Pioneer Southwest Energy Partners L.P., File No. 001-34032, filed with the SEC on May 9, 2008).
10.57	—	Administrative Services Agreement, dated effective May 6, 2008, among Pioneer Natural Resources GP LLC, Pioneer Southwest Energy Partners L.P., Pioneer Southwest Energy Partners USA LLC, and Pioneer Natural Resources USA, Inc. (incorporated by reference to Exhibit 10.2 to the Current Report on Form 8-K, of Pioneer Southwest Energy Partners L.P., File No. 001-34032, filed with the SEC on May 9, 2008).
10.58	—	Amended and Restated Credit Agreement entered into as of March 29, 2012, among Pioneer Southwest Energy Partners L.P., as the Borrower, Bank of America, N.A., as Administrative Agent, and certain other lenders (incorporated by reference to Exhibit 10.1 to the Current Report on Form 8-K of Pioneer Southwest Energy Partners L.P., File No. 001-34032, filed with the SEC on April 3, 2012).
10.59	—	Voting Agreement dated as of August 9, 2013, by and among the Company, Pioneer Natural Resources USA, Inc., PNR Acquisition Company, LLC, Pioneer Southwest Energy Partners L.P., and Pioneer Natural Resources GP LLC (incorporated by reference to Exhibit 10.1 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on August 12, 2013).
10.60 H	—	Pioneer Southwest Energy Partners L.P. 2008 Long Term Incentive Plan (now known as the Pioneer 2008 PSE Employee Long Term Incentive Plan) (incorporated by reference to Exhibit 10.1 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on December 17, 2013).
10.61 H	—	First Amendment to Pioneer 2008 PSE Employee Long Term Incentive Plan (incorporated by reference to Exhibit 10.2 to the Company's Current Report on Form 8-K, File No. 1-13245, filed with the SEC on December 17, 2013).

140

10.62 H	—	Form of Phantom Unit Award Agreement between the General Partner of Pioneer Southwest Energy Partners L.P. and Scott D. Sheffield, with respect to awards of phantom units made under the Pioneer 2008 PSE Employee Long Term Incentive Plan, together with a schedule identifying other substantially identical agreements between the General Partner and each of its other recipients of phantom unit awards and identifying the material differences between those agreements and the filed Phantom Unit Award Agreement (incorporated by reference to Exhibit 10.1 to Pioneer Southwest Energy Partners L.P.'s Current Report on Form 8-K, File No. 001-34032, filed with the SEC on March 9, 2010).
12.1  (a)	—	Computation of Ratios of Earnings to Fixed Charges and Earnings to Fixed Charges and Preferred Stock Dividends.
21.1  (a)	—	Subsidiaries of the registrant.
23.1  (a)	—	Consent of Ernst & Young LLP.
23.2  (a)	—	Consent of Netherland, Sewell & Associates, Inc.
23.3  (a)	—	Consent of Ryder Scott Company, L.P.
31.1  (a)	—	Chief Executive Officer certification under Section 302 of the Sarbanes-Oxley Act of 2002.
31.2  (a)	—	Chief Financial Officer certification under Section 302 of the Sarbanes-Oxley Act of 2002.
32.1  (b)	—	Chief Executive Officer certification under Section 906 of the Sarbanes-Oxley Act of 2002.
32.2  (b)	—	Chief Financial Officer certification under Section 906 of the Sarbanes-Oxley Act of 2002.
95.1 (a)	—	Mine Safety Disclosure pursuant to Section 1503(a) of the Dodd-Frank Wall Street Reform and Consumer Protection Act.
99.1  (a)	—	Report of Netherland, Sewell & Associates, Inc.
101.INS (a)	—	XBRL Instance Document.
101. SCH (a)	—	XBRL Taxonomy Extension Schema.
101. CAL  (a)	—	XBRL Taxonomy Extension Calculation Linkbase Document.
101. DEF  (a)	—	XBRL Taxonomy Extension Definition Linkbase Document.
101. LAB  (a)	—	XBRL Taxonomy Extension Label Linkbase Document.
101. PRE (a)	—	XBRL Taxonomy Extension Presentation Linkbase Document.

 _____________________________

(a)	Filed herewith.
(b)	Furnished herewith.
H	Executive Compensation Plan or Arrangement.
*	Pursuant to the rules of the Commission, certain of the schedules and similar attachments to the Agreement have not been filed. The registrant agrees to furnish supplementally a copy of any omitted schedule to the Commission upon request.

141

EX-10.36

EXHIBIT 10.36

AMENDMENT NO. 3

TO THEPIONEER NATURAL RESOURCES COMPANY

EXECUTIVE DEFERRED COMPENSATION PLAN

(Amended and Restated Effective January 1, 2009)

Pursuant to the provisions of Section 11.4, the Pioneer Natural Resources Company Executive Deferred Compensation Plan (Amended and Restated Effective January 1, 2009) (the “Plan”) is hereby amended to add the following:

1.    The following subsections are hereby added to Section 2.1 of the Plan:

(_)    “Alternate Payee” means any spouse, former spouse, child, or other dependent of a Member who is recognized by a DRO as having a right to receive all, or a portion of, the benefits payable under the Plan with respect to such Member.

(_)    “DRO” means a domestic relations order that is a judgment, decree, or order (including one that approves a property settlement agreement) that relates to the provision of child support, alimony payments or marital property rights to a spouse, former spouse, child or other dependent of a Member and is rendered under a state (within the meaning of Code Section 7701(a)(10)) domestic relations law (including a community property law) and that:

(i)    creates or recognizes the existence of an Alternate Payee’s right to, or assigns to an Alternate Payee the right to receive all or a portion of the benefits payable with respect to a Member under the Plan;

(ii)    does not require the Plan to provide any type or form of benefit, or any option, not otherwise provided under the Plan;

(iii)    does not require the Plan to provide increased benefits (determined on the basis of actuarial value);

(iv)    does not require the payment of benefits to an Alternate Payee that are required to be paid to another Alternate Payee under another order previously determined to be a DRO; and

(v)    clearly specifies: the name and last known mailing address of the Member and of each Alternate Payee covered by the DRO; the amount or percentage of the Member’s benefits to be paid by the Plan to each such Alternate Payee, or the manner in which such amount or percentage is to be determined; the number of payments or payment periods to which such order applies; and that it is applicable with respect to this Plan.

2.    Section 6.11 is hereby added to the Plan as follows:

Section 6.11    Spousal Claims.

(a)    In the event that an Alternate Payee is entitled to all or a portion of a Member’s Accounts pursuant to the terms of a DRO, such benefits will be paid in a lump sum in cash as soon as practicable following the acceptance of the DRO by the Plan Administrator.

(b)    Any taxes or other legally required withholdings from payments to such Alternate Payee will be deducted and withheld by the Company, benefit provider or funding agent. The Alternate Payee will be provided with a tax withholding election form for purposes of federal and state tax withholding, if applicable.

(c)    The Plan Administrator will have sole and absolute discretion to determine whether a judgment, decree or order is a DRO, to determine whether a DRO will be accepted for purposes of this Section 6.11 and to make interpretations under this Section 6.11, including determining who is to receive benefits, all calculations of benefits and determinations of the form of such benefits, and the amount of taxes to be withheld. The decisions of the Plan Administrator will be binding on all parties with an interest.

(d)    Any benefits payable to an Alternate Payee pursuant to the terms of a DRO will be subject to all provisions and restrictions of the Plan and any dispute regarding such benefits will be resolved pursuant to the Plan claims procedure in Section 7.7.

3.    Section 11.2 is hereby amended as follows:

Section 11.2    Alienation of Interest Forbidden. Except as provided in Section 6.11, the interest of a Member or his or her Beneficiary or beneficiaries hereunder may not be sold, transferred, assigned, or encumbered in any manner, either voluntarily or involuntarily, and any attempt to so anticipate, alienate, sell, transfer, assign, pledge, encumber, or charge the same shall be null and void; neither shall the benefits thereunder be liable for or subject to the debts, contracts, liabilities, engagements or torts of any person to whom such benefits or funds are payable, nor shall they be an asset in bankruptcy or subject to garnishment, attachment or other legal or equitable proceedings.

IN WITNESS WHEREOF, this Amendment has been executed on this 19th day of August, 2013, to be effective January 1, 2013.

PIONEER NATURAL RESOURCES COMPANY

By: /s/ Larry N. Paulsen        

Name:    Larry N. Paulsen

Title: Vice President, Administration and Risk Management

1

EX-10.37

EXHIBIT 10.37

AMENDMENT NO. 4

TO THE

PIONEER NATURAL RESOURCES COMPANY

EXECUTIVE DEFERRED COMPENSATION PLAN

(Amended and Restated Effective January 1, 2009)

Pursuant to the provisions of Section 11.4 thereof, the Pioneer Natural Resources Company Executive Deferred Compensation Plan (Amended and Restated Effective January 1, 2009, and as further amended to date) is hereby amended to restate Section 2.1(o) in its entirety as follows:

“Eligible Employee” means any individual employed by a Company who is (i) an officer of the Company or (ii) a member of a select group of management or highly compensated employees (A) designated by the Plan Administrator from time to time as being eligible to participate in the Plan, (B) whose designated grade level is at least grade 23 in the Company’s general salary grade structure or an equivalent grade in the specialized grade structure, as determined by the Plan Administrator and (C) whose annual rate of Basic Compensation is (x) $185,000 or above as of December 31, 2013 or (y) $200,000 or above from and after January 1, 2014; provided, however, that the Basic Compensation and grade level requirements provided in clause (ii)(B) of this subsection shall not apply to Members in the Plan as of December 31, 2008, and provided further, that the individuals that became Members between January 1, 2009 and December 31, 2013 shall be defined by the definition of “Eligible Employee” contained in the Plan as of the date that the individual became a Member. An Eligible Employee shall remain an Eligible Employee notwithstanding any reduction in his or her annual rate of Basic Compensation below the applicable minimum under clause (ii)(B) of this subsection; provided, however, that the Plan Administrator in its discretion may withdraw an individual’s designation as an Eligible Employee under clause (ii) at any time and for any reason effective with respect to any subsequent Plan Year.

IN WITNESS WHEREOF, this Amendment has been executed on this 5th day of December, 2013, to be effective January 1, 2014.

	PIONEER NATURAL RESOURCES COMPANY
By	/s/ Larry N. Paulsen
	Larry N. Paulsen
	Vice President, Administration and Risk Management

EX-10.38

EXHIBIT 10.38

PIONEER NATURAL RESOURCES USA, INC.401(k) AND MATCHING PLAN

(Amended and Restated Effective as of January 1, 2013)

PIONEER NATURAL RESOURCES USA, INC.401(k) AND MATCHING PLAN

(Amended and Restated Effective as of January 1, 2013)

TABLE OF CONTENTS

		PAGE
ARTICLE I	DEFINITIONS AND CONSTRUCTION	1
Section 1.1	Definitions	1
Section 1.2	Construction	11
ARTICLE II	ELIGIBILITY AND PARTICIPATION	12
Section 2.1	Eligibility	12
Section 2.2	Participation	12
Section 2.3	Reemployed Participant	12
ARTICLE III	CONTRIBUTIONS, LIMITATIONS AND FORFEITURES	13
Section 3.1	Pre-Tax and Pre-Tax Bonus Contributions	13
Section 3.2	Matching Contributions	15
Section 3.3	Catch-Up Contributions	16
Section 3.4	After-Tax Contributions	16
Section 3.5	Payment for Contributions	17
Section 3.6	Return of Employer Contributions	17
Section 3.7	Nondiscrimination Testing	17
Section 3.8	Application of Forfeitures	22
Section 3.9	Rollover Contributions	22
ARTICLE IV	TRUST FUND AND VALUATIONS	23
Section 4.1	Trust and Trustee	23
Section 4.2	Trust Divestment Options	23
Section 4.3	Valuation and Adjustment of Accounts	24
Section 4.4	Participant Statements	24
ARTICLE V	VESTING	25
Section 5.1	Fully Vested Accounts	25
Section 5.2	Vesting of Employer Account	25
Section 5.3	Special Vesting Provisions	26
ARTICLE VI	VALUATIONS, DISTRIBUTIONS AND WITHDRAWALS	27
Section 6.1	Time of Distribution	27
Section 6.2	Distribution of Retirement and Disability Benefits	29
Section 6.3	Distribution of Death Benefit	30
Section 6.4	Distribution of Separation from Employment Benefit	32
Section 6.5	Forfeitures	33
Section 6.6	In-Service Withdrawals	34

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Section 6.7	Distributions to Minors and Persons Under Legal Disability	36
Section 6.8	Unclaimed or Uncashed Benefits	37
Section 6.9	Plan Loans	37
Section 6.10	Qualified Domestic Relations Orders	38
Section 6.11	Transfer of Eligible Rollover Distribution	39
Section 6.12	Automatic Rollovers	40
Section 6.13	Distribution on Normal Retirement Date and Retirement	41
Section 6.14	In-Plan Roth Rollovers	41
ARTICLE VII	PLAN ADMINISTRATION	42
Section 7.1	401(k) and Matching Plan Committee	42
Section 7.2	Powers, Duties and Liabilities of the Committee	42
Section 7.3	Rules, Records and Reports	43
Section 7.4	Administration Expenses and Taxes	43
ARTICLE VIII	AMENDMENT AND TERMINATION	43
Section 8.1	Amendment	43
Section 8.2	Termination	43
Section 8.3	Benefit Plan Design Committee	44
ARTICLE IX	TOP-HEAVY PROVISIONS	44
Section 9.1	Top-Heavy Definitions	44
Section 9.2	Minimum Contribution Requirement	45
Section 9.3	Minimum Vesting Schedule	46
ARTICLE X	MISCELLANEOUS GENERAL PROVISIONS	46
Section 10.1	Spendthrift Provision	46
Section 10.2	Claims Procedure	46
Section 10.3	Maximum Contribution Limitation	47
Section 10.4	Employment Noncontractual	47
Section 10.5	Limitations on Responsibility	47
Section 10.6	Merger or Consolidation	47
Section 10.7	Applicable Law	47
Section 10.8	USERRA Compliance	48

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PIONEER NATURAL RESOURCES USA, INC.401(k) AND MATCHING PLAN

(Amended and Restated Effective as of January 1, 2013)

THIS 401(k) AND MATCHING PLAN, a profit sharingplan, made and executed by PIONEER NATURAL RESOURCES USA, INC., a Delaware corporation (the “Company”),

WITNESSETH THAT:

WHEREAS, the Company has heretofore maintained for the benefit of its employees a qualified profit sharing plan known as the Pioneer Natural Resources USA, Inc. 401(k) and Matching Plan; and

WHEREAS, the Company previously restated the Pioneer Natural Resources USA, Inc. 401(k) and Matching Plan to comply with the final Internal Revenue Code section 415 regulations, currently effective provisions of the Pension Protection Act of 2006, and the Heroes Earnings Assistance and Relief Tax (“HEART”) Act of 2008, to clarify forfeitures, and to make certain other administrative changes.

WHEREAS, the Company now desires to restate the Pioneer Natural Resources USA, Inc. 401(k) and Matching Plan to incorporate prior amendments and add an in-plan Roth rollover option under the Plan.

NOW, THEREFORE, in consideration of the premises and pursuant to the authority reserved thereunder, the Pioneer Natural Resources USA, Inc. 401(k) and Matching Plan is hereby amended by restatement in its entirety, effective as of January 1, 2013, to read as follows:

ARTICLE IDEFINITIONS AND CONSTRUCTION

Section 1.1Definitions. Unless the context clearly indicates otherwise, when used in this Plan:

(a)“Account” means a Participant’s After-Tax Account, Catch-Up Contribution Account, Employer Account, Matching Plan Account, Mesa After-Tax Account, Mesa Premium Account, Mesa Profit-Sharing Account, Pre-Tax Account, Prior Plan Employer Account, Prior Plan Pre-Tax Account, Rollover Account, Roth Account, Roth Catch-Up Contribution Account, Roth Rollover Account and/or In-Plan Roth Rollover Contribution Account, as the context requires. The Committee may establish and maintain separate subaccounts within a Participant’s Accounts if it deems such to be necessary for the proper administration of the Plan.

(b)“Affiliated Company” means any corporation or organization, other than an Employer, which is a member of a controlled group of corporations (within the meaning of Code Section 414(b)) or of an affiliated service group (within the meaning of Code Section

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414(m)) with respect to which an Employer is also a member, and any other incorporated or unincorporated trade or business which along with an Employer is under common control (within the meaning of the regulations from time to time promulgated by the Secretary of the Treasury pursuant to Code Section 414(c)); provided, however, that for the purposes of Section 10.3 of the Plan, Code Section 414(b) and (c) shall be applied as modified by Code Section 415(h).

(c)“After-Tax Account” means the account established and maintained under this Plan by the Committee to record a Participant’s interest under this Plan attributable to After-Tax Contributions.

(d)“After-Tax Contribution” means a contribution made by a Participant to this Plan pursuant to Section 3.4.

(e)“Basic Compensation” means, for all Participants who are not members of the Orange County Union and the Glass Rock/Millwood Union, the sum of (i) the base salary or wages and any overtime payable by an Employer to an Employee for personal services rendered to the Employer (including sick and vacation pay), but excluding any amount payable pursuant to an Employer’s salary continuation program, (ii) any contributions made by an Employer on behalf of the Employee to a qualified cash or deferred arrangement (within the meaning of Code Section 401(k)) maintained by such Employer, including any Catch-Up Contributions, Pre-Tax Contributions and Pre-Tax Bonus Contributions made by an Employer to this Plan on behalf of such Employee, (iii) any compensation reduction amounts elected by such Employee for the purchase of benefits pursuant to a cafeteria plan (within the meaning of Code Section 125(d)) maintained by an Employer, (iv) any elective amounts that are not includible in the gross income of an Employee by reason of Code Section 132(f)(4), and (v) any military differential wage payments made by the Employer; provided, however, that the Basic Compensation of an Employee taken into account under the Plan for any Plan Year shall not exceed $200,000 (as adjusted to take into account any cost-of-living increases authorized pursuant to Code Section 401(a)(17)(B)) and bonuses to be paid on April 15, 2012 for services performed for a previous employer and any quarterly bonus paid will be excluded.

For all Participants who are members of the Orange County Union and the Glass Rock/Millwood Union, “Basic Compensation” means “Compensation” as defined under Section 1.1(k) of the Plan with the following exclusions:

(i)reimbursements or other expense allowances, fringe benefits (cash and non-cash), moving expenses, deferred compensation, and welfare benefits;

(ii)amounts earned but not paid during the Plan Year solely because of the timing of pay periods and pay dates (the “administrative delay rule”);

(iii)salary continuation payments paid to a Participant who is permanently and totally disabled (as defined by Code Section 22(e)(3));

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(iv)bonuses to be paid on April 15, 2012 for services performed for a previous employer; and

(v)any quarterly bonus paid.

(f)“Catch-Up Contribution” means a contribution made by an Employer on behalf of a Participant pursuant to Section 3.3.

(g)“Catch-Up Contribution Account” means the account established and maintained under this Plan by the Committee to record a Participant’s interest under this Plan attributable to Catch-Up Contributions (other than Catch-Up Contributions that are treated by an Employer as designated Roth contributions (within the meaning of Code Section 402A(c)) pursuant to Section 3.3.

(h)“Code” means the Internal Revenue Code of 1986, as amended.

(i)“Committee” means the 401(k) and Matching Plan Committee appointed by the Board of Directors of the Company to administer the Plan.

(j)“Company” means Pioneer Natural Resources USA, Inc., a Delaware corporation, and any successor thereto.

(k)“Compensation” means the sum of (i) wages within the meaning of Code Section 3401(a) and all other payments of remuneration to an Employee by an Employer (in the course of the Employer’s trade or business) for which the Employer is required to furnish the Employee a written statement under Code Sections 6041(d), 6051(a)(3) and 6052, but determined without regard to any rules that limit the remuneration included in wages based on the nature or location of the employment or the services performed (such as the exception for agricultural labor in Code Section 3401(a)(2)), (ii) any contributions made by an Employer on behalf of the Employee to a qualified cash or deferred arrangement (within the meaning of Code Section 401(k)) maintained by such Employer, including any Catch-Up Contributions, Pre-Tax Contributions and Pre-Tax Bonus Contributions made by an Employer to this Plan on behalf of such Employee, (iii) any compensation reduction amounts elected by such Employee for the purchase of benefits pursuant to a cafeteria plan (within the meaning of Code Section 125(d) maintained by an Employer, (iv) any elective amounts that are not includible in the gross income of an Employee by reason of Code Section 132(f)(4), and (v) including any military differential wage payments made by the Employer; provided, however, that except for purposes of determining whether an Employee is a Highly Compensated Employee or a Key Employee (within the meaning of Section 9.1(c)), the Compensation of an Employee taken into account under the Plan for any Plan Year shall not exceed $200,000 (as adjusted to take into account any cost-of-living increases authorized pursuant to Code Section 401(a)(17)(B)).

(i)To be taken into account for a Plan Year, Compensation must actually be paid or made available to a Participant (or, if earlier, includible in the gross income of the Participant) within the Plan Year and prior to the Participant’s severance from

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employment with the Employer. For purposes of this rule, amounts representing regular pay after severance from employment including payment for services during the Employee’s regular working hours, or compensation for services outside the Employee’s regular working hours (such as overtime or shift differential), commissions, bonuses, or other similar payments will not fail to be Compensation merely because they are paid after the Participant’s severance from employment, provided that such amounts are paid by the later of two and one half (2½) months after the severance from employment or the end of the Plan Year that includes the date of the severance from employment and the amounts would have been included in Compensation if they were paid prior to the Employee’s severance from employment.

(ii)Compensation also specifically includes the following: (A) certain cashouts and deferred compensation are included in Compensation if paid by the later of two and one half (2½) months following severance from employment or the end of the Plan Year during which the severance occurred. Cashouts are includible only if they would have been included in Compensation if paid prior to the Participant’s severance from employment, are paid for bona fide sick, vacation and/or other leave, and the Participant would have been able to use that leave if employment had continued. Deferred compensation is includible in Compensation only if it would have been includible in Compensation if paid prior to the Participant’s severance from employment, is received from a nonqualified unfunded deferred compensation plan, would have been paid at the same time if the Participant had continued in employment, and would have been included in the Participant’s gross income; (B) payments to an individual who does not currently perform services for the Employer by reason of qualified military service (as that term is used in section 414(u)(1)) to the extent the payments do not exceed the amounts the individual would have received if the individual had continued to perform services for the employer rather than entering qualified military service, and (C) compensation paid to a Participant who is permanently and totally disabled (as defined in section 22(e)(3)).

(iii)Compensation will exclude severance pay as provided pursuant to regulations promulgated under section 415 of the Code. Effective for Plan Years beginning on and after July 1, 2007, Compensation will specifically exclude (i) severance pay or parachute payments within the meaning of section 280G(b)(2) of the Code if paid after severance from employment; and (ii) post-severance payments made under a nonqualified unfunded deferred compensation plan unless the payments would have been paid at that time without regard to the severance from employment.    

(l)“Covered Employee” means any Employee other than an individual who is • a member of a collective bargaining unit with which an Employer negotiates and with respect to whom no coverage under this Plan has been provided by collective bargaining agreement, • a nonresident alien with respect to the United States who receives no earned income from an Employer which constitutes income from sources within the United States,

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• classified by an Employer as a student or intern, • not treated by an Employer at the time of the performance of services as an employee for federal tax purposes, regardless of any subsequent classification by an Employer, any governmental agency or account, or • treated as a leased employee by an Employer. A leased employee means any person who is not an employee of the recipient of the services performed and who provides services to the recipient if (i) such services are provided pursuant to an agreement between the recipient and any other person, (ii) such person has performed such services for the recipient (or for the recipient and related persons) on a substantially full-time basis for a period of at least one year, and (iii) such services are performed under primary direction or control by the recipient.

(m)“Employee” means any individual employed by an Employer.

(n)“Employer” shall include the Company and any other incorporated or unincorporated trade or business which may subsequently adopt this Plan with the consent of the Board of Directors of the Company.

(o)“Employer Account” means the account established and maintained under this Plan by the Committee to record a Participant’s interest under this Plan attributable to • any amounts credited to his or her Employer Account under the Superseded Plan as in effect on December 31, 2001, and • any Matching Contributions made to the Plan for the Participant on or after January 1, 2002.

(p)“Employment Date” means the date an Employee first performs an Hour of Service.

(q)“Highly Compensated Employee” means for a Plan Year:

(i)any Employee who during such Plan Year or during the preceding Plan Year was at any time a 5% owner (as defined in Code Section 416(i)(l)) of an Employer or Affiliated Company, or

(ii)any Employee who during the preceding Plan Year received Compensation greater than $80,000 (as adjusted to take into account any cost-of living increases authorized pursuant to Code Section 414(q)(l)) and who is in the group consisting of the top 20% (when ranked on the basis of Compensation received during such preceding year) of all Employees, except those excluded pursuant to Code Section 414(q)(5).

Solely for purposes of this definition, (A) an employee of an Affiliated Company shall be deemed to be an Employee, (B) compensation received from an Affiliated Company shall be deemed to be Compensation, and (C) a nonresident alien who receives no earned income from an Employer or Affiliated Company which constitutes income from sources within the United States shall not be considered an Employee.

(r)“Hour of Service” means an hour for which an Employee is directly or indirectly compensated or entitled to compensation (including back pay, regardless of

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mitigation of damages) by an Employer for the performance of duties for an Employer or for reasons (such as vacation, sickness or disability) other than the performance of duties for an Employer. An Employee will be credited with eight Hours of Service per day for any customary work period during which such Employee is on leave of absence authorized by his or her Employer. Leaves of absence shall be granted by an Employer to its Employees on a uniform, nondiscriminatory basis. In no event shall more than 501 Hours of Service be credited on account of any single continuous period during which the individual performs no duties. An Employee’s Hours of Service shall be credited to the appropriate Plan Years or eligibility computation period determined in accordance with the provisions of Section 2530.200b-2(b) and (c) of the Department of Labor Regulations, which are incorporated herein by this reference. In determining Hours of Service for the purposes of this Plan, periods of employment by an Affiliated Company and services performed as a leased employee (within the meaning of Code Section 414(n)) of an Employer or Affiliated Company shall be deemed to be periods of employment by an Employer.

(s)“In-Plan Roth Rollover Contribution Account” means the account established and maintained under this Plan by the Committee, which is credited with the Participant’s In-Plan Roth Rollover Contributions.

(t)“In-Plan Roth Rollover Contributions” means contributions made to the Plan by a Participant in accordance with Code Section 402A(c)(4) and Section 6.14 to the Participant’s In-Plan Roth Rollover Contribution Account, which consists of a distribution from a Participant’s Accounts other than the Participant’s Roth Account, Roth Catch-Up Contribution Account and/or Roth Rollover Account.

(u)“Investment Fund” means any fund authorized for the investment of Trust assets pursuant to Section 4.2.

(v)“Matching Contribution” means a contribution made by an Employer to the Plan for a Participant pursuant to Section 3.2.

(w)“Matching Plan Account” means the account established and maintained under this Plan by the Committee to record a Participant’s interest under this Plan attributable to matching contributions made for such Participant pursuant to the provisions of the Matching Plan as in effect on December 31, 2001.

(x)“Matching Plan” means the Pioneer Natural Resources USA, Inc. Matching Plan, as in effect from time to time prior to January 1, 2002.

(y)“Mesa After-Tax Account” means the account established and maintained under this Plan by the Committee to record a Participant’s interest under this Plan attributable to his or her accrued benefit derived from after-tax contributions to the Mesa Profit-Sharing Plan as in effect on September 30, 1997.

(z)“Mesa Premium Account” means the account established and maintained under this Plan by the Committee to record a Participant’s interest under this Plan attributable

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to Employer contributions made for such Participant pursuant to the provisions of the Mesa Premium Plan as in effect on September 30, 1997.

(aa)“Mesa Premium Plan” means the Mesa Employees Premium Plan and Trust Agreement as in effect from time to time prior to October 1, 1997.

(bb)“Mesa Profit-Sharing Account” means the account established and maintained under this Plan by the Committee to record a Participant’s interest under this Plan attributable to his or her accrued benefit derived from employer contributions to the Mesa Profit-Sharing Plan as in effect on September 30, 1997.

(cc)“Mesa Profit-Sharing Plan” means the Mesa Profit-Sharing Plan and Trust Agreement as in effect from time to time prior to October 1, 1997.

(dd)“Non-Highly Compensated Employee” means for a Plan Year any Employee who is not a Highly Compensated Employee for such Plan Year.

(ee)The “Normal Retirement Date” of a Participant means the day such Participant attains the age of 65 years.

(ff)“One Year Break in Service” means a 12-consecutive-month Period of Severance during which an Employee fails to complete a single Hour of Service.

(gg)“Participant” means any individual who was a participant in either the Superseded Plan or the Matching Plan or who has elected to participate in this Plan pursuant to Section 2.2, and whose Vested Interest under this Plan has not been fully distributed.

(hh)“Period of Service” means, for purposes of determining a Participant’s Vested Interest in his or her Employer Account, the sum, rounded downward, to the nearest whole year, of each period of time commencing with an Employee’s Employment Date or Reemployment Date and ending on the first date thereafter a Period of Severance begins (except as provided in subsection (gg) of this Section in the case of an Employee’s maternity or paternity leave of absence). Included in such sum to be credited to an Employee shall be each period of time during which the Employee is on an authorized leave of absence for reasons of vacation, sickness, layoff or another occasion designated and applied by an Employer or Affiliated Company on a nondiscriminatory basis, but in no event exceeding one year in length. A Period of Service also includes any Period of Severance of less than 12 consecutive months. If an Employee who has no vested right to any amount credited to his or her Account incurs a One Year Break in Service, such Employee shall forfeit his or her prior Period of Service unless he or she completes an additional one-year Period of Service before the number of his or her consecutive One Year Breaks in Service equals five. Solely for the purpose of determining the Period of Service completed by a Covered Employee who was in the employ of Colorado Interstate Gas Company on May 1, 2001, periods of employment by Colorado Interstate Gas Company or a subsidiary thereof prior to May 1, 2001, shall be considered to be periods of employment by an Employer. Solely for the purpose of determining the Period of Service completed by a Covered Employee

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who was in the employ of Evergreen Resources, Inc. (or a subsidiary thereof) on September 27, 2004, and who became an employee of an Employer on September 28, 2004 and a Participant in this Plan on October 1, 2004, service with Evergreen Resources, Inc. or a subsidiary thereof (or a predecessor of any such entity) prior to September 28, 2004, that is taken into account for purposes of determining such Employee’s service for vesting purposes under the Evergreen Resources, Inc. 401(k) Profit Sharing Plan shall be considered to be service with an Employer. Solely for the purpose of determining the Period of Service completed by a Covered Employee who was in the employ of Carmeuse Lime, Inc. (or a subsidiary thereof) on April 1, 2012, and who became an employee of an Employer on April 2, 2012 and a Participant in this Plan on April 2, 2012, service with Carmeuse Lime, Inc. or a subsidiary thereof prior to April 2, 2012 shall be considered to be service with an Employer.

Any provision of this Plan to the contrary notwithstanding, if a Participant participated in the Superseded Plan prior to October 1, 1997, the Period of Service completed by such Participant prior to January 1, 1998, shall be (%4) such Participant’s years of Vesting Service determined under the Retirement Savings Plan for Employees of Parker & Parsley as of June 27, 1996, • plus one year for the Plan Year ending December 31, 1996, if during such Plan Year such Participant completed a Year of Service under the Retirement Savings Plan for Employees of Parker & Parsley as in effect at the end of such year, • plus one year for the Plan Year ending December 31, 1997, if such Participant either (A) completed a year of Vesting Service as of September 30, 1997, under the Superseded Plan as in effect on such date or (B) completed a one year Period of Service under the foregoing provisions of this definition during the entire such Plan Year. For purposes of clause (ii) of the preceding sentence, a Participant shall be credited with a number of Hours of Service applying the monthly equivalency method set forth in Labor Reg. § 2530.200b-3(e)(l)(iv) to any fractional part of a year credited to such Participant as of June 28,1996.

(ii)“Period of Severance” means a period of time commencing with the date an Employee ceases to be employed by an Employer or Affiliated Company for reasons of Retirement, Permanent Disability, death, being discharged, or voluntarily ceasing employment, or with the first anniversary of the date of his or her absence for any other reason, and ending with the date such Employee resumes employment with an Employer or Affiliated Company, provided, however, that solely for purposes of determining whether an Employee incurs a One Year Break in Service, the Period of Severance of an Employee who is absent from work due to the pregnancy of the Employee, the birth of a child of the Employee, the placement of a child with the Employee in connection with the adoption of such child by such Employee, or caring for such child for a period beginning immediately following such birth or placement shall not commence until the second anniversary of the first date of such absence and the period between the first and second anniversaries of the first date of such absence shall be considered neither a Period of Service nor a Period of Severance.

(jj)“Permanent Disability” means a Participant’s disability that qualifies the Participant for long-term disability benefits under a plan providing such benefits sponsored

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by an Employer or, if a Participant is not eligible for benefits under such a plan, a disability that, as determined by the Social Security Administration, entitles the Participant to Social Security disability benefits.

(kk)“Pioneer Stock” means the common stock of Pioneer Natural Resources Company, a Delaware corporation, and any successor thereto.

(ll)“Plan” means this Pioneer Natural Resources USA, Inc. 401(k) and Matching Plan (Amended and Restated Effective as of January 1, 2013), as in effect from time to time.

(mm)“Plan Year” means the calendar year.

(nn)“Pre-Tax Account” means the account established and maintained under this Plan by the Committee to record a Participant’s interest under this Plan attributable to • Pre-Tax Contributions and Pre-Tax Bonus Contributions made by an Employer on behalf of such Participant, other than Pre-Tax Contributions and Pre-Tax Bonus Contributions that are treated by an Employer as designated Roth contributions (within the meaning of Code Section 402A(c)) pursuant to Section 3.1, and • any amounts credited to his or her Employee Pre-Tax Contribution Account under the Superseded Plan as in effect on September 30, 1997.

(oo)“Pre-Tax Bonus Contribution” means a contribution made by an Employer to this Plan on behalf of a Participant pursuant to Section 3.1(b).

(pp)“Pre-Tax Contribution” means a contribution made by an Employer to this Plan on behalf of a Participant pursuant to Section 3.1(a).

(qq)“Prior Plan Employer Account” means the account established and maintained under this Plan by the Committee to record a Participant’s interest under this Plan attributable to any amounts credited to his or her BOUSA Employer Matching Contribution Account under the Retirement Savings Plan for Employees of Parker & Parsley as in effect on June 27, 1996.

(rr)“Prior Plan Pre-Tax Account” means the account established and maintained under this Plan by the Committee to record a Participant’s interest under this Plan attributable to any amounts credited to his or her Plan A Salary Deferral Contribution Account or his or her BOUSA Plan Salary Deferral Contribution Account under the Retirement Savings Plan for Employees of Parker & Parsley as in effect on June 27, 1996.

(ss)“Qualified Joint and Survivor Annuity” means an annuity which is payable for the life of the Participant with a survivor annuity payable for the life of his or her Spouse equal to 50% of the amount of the annuity payable during the life of the Participant; provided, however, that in the case of a Participant who is not married, a Qualified Joint and Survivor Annuity means an annuity which is payable for the life of the Participant. “Qualified Optional Survivor Annuity” means an annuity which is payable for the life of the Participant with a survivor annuity payable for the life of his or her Spouse equal to 75% of the amount of the

9

annuity payable during the life of the Participant. “Alternate Qualified Joint and Survivor Annuity” means an annuity which is payable for the life of the Participant with a survivor annuity payable for the life of his or her Spouse equal to 100% of the amount of the annuity payable during the life of the Participant.

(tt)“Qualified Preretirement Survivor Annuity” means an annuity which is payable for the life of the Participant’s surviving Spouse.

(uu)“Reemployment Date” means the date an Employee first performs an Hour of Service following a Period of Severance.

(vv)“Retirement” means the termination of a Participant’s employment with an Employer or Affiliated Company on or after his or her Normal Retirement Date for any reason other than death or transfer to the employment of another Employer or Affiliated Company.

(ww)“Rollover Account” means the account established and maintained under this Plan by the Committee to record a Participant’s interest under this Plan attributable to • Rollover Contributions made by such Participant to this Plan pursuant to Section 3.9, • any amounts credited to his or her Rollover Contribution Account under the Superseded Plan as in effect on September 30, 1997, and • any amounts credited to his or her Rollover Account under the Mesa Profit-Sharing Plan as in effect on September 30, 1997.

(xx)“Rollover Contribution” means a contribution made to this Plan pursuant to Section 3.9.

(yy)“Rollover Property” means property the value of which would be excluded from the gross income of the transferor under Code Sections 402(c), 403(a)(4) or 408(d)(3) if transferred to the Plan.

(zz)“Roth Account” means the account established and maintained under this Plan by the Committee to record a Participant’s interest under this Plan attributable to Roth Contributions.

([[)“Roth Catch-Up Contribution Account” means the account established and maintained under this Plan by the Committee to record a Participant’s interest under this Plan attributable to Catch-Up Contributions designated as Roth contributions (within the meaning of Section 402A(c) of the Code) pursuant to Section 3.3.

(aaa)“Roth Contribution” means a Pre-Tax Contribution or Pre-Tax Bonus Contribution made by an Employer to this Plan on behalf of a Participant and designated by the Participant as a Roth contribution (within the meaning of Section 402A(c) of the Code) pursuant to Section 3.1(e).

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(bbb)“Roth Rollover Account” means the account established and maintained under this Plan by the Committee to record an individual’s interest under this Plan attributable to Roth Rollover Property transferred by such individual to this Plan.

(ccc)“Roth Rollover Property” means cash the amount of which would be a rollover contribution described in Section 402A(c)(3) of the Code if transferred to the Plan.

(ddd)“Spouse” means the person lawfully married to a Participant. Notwithstanding any provision of the Plan to the contrary, effective as of September 16, 2013, the term “Spouse” as used in the Plan with respect to a Participant includes an individual of the same sex as such Participant if such Participant and such individual validly entered into a marriage in a domestic or foreign jurisdiction whose laws authorize the marriage of two individuals of the same sex, even if the couple is domiciled in a jurisdiction that does not recognize the validity of same-sex marriages.

(eee)“Superseded Plan” means the Pioneer Natural Resources USA, Inc. 401(k) Plan, as in effect from time to time prior to January 1, 2002. Prior to August 7, 1997, the Superseded Plan was known as the Retirement Savings Plan for Employees of Parker & Parsley.

(fff)“Total Tax-Advantaged Contributions” means the sum of the Pre-Tax Contributions, Pre-Tax Bonus Contributions, and Roth Contributions made on behalf of a Participant

(ggg)“Trust” means the trust fund established pursuant to Section 4.1.

(hhh)“Trustee” means the individual or corporate trustee or trustees from time to time appointed and acting as trustee or trustees of the Trust established pursuant to the Plan.

(iii)“Valuation Date” means each business day.

(jjj)“The “Vested Interest” of a Participant means the then vested portion of the amount credited to the Accounts of such Participant at the particular point in time in question.

(kkk)“Year of Eligibility Service” means the period of 12 consecutive months commencing on an Employee’s Employment Date, or any Plan Year commencing after his or her Employment Date, during which the Employee completes at least 1,000 Hours of Service. Solely for the purpose of determining a Year of Eligibility Service completed by a Covered Employee who was in the employ of Carmeuse Lime, Inc. (of a subsidiary thereof) on April 1, 2012, and who became an employee of an Employer on April 2, 2012 and a Participant in this Plan on April 2, 2012, service with Carmeuse Lime, Inc. or a subsidiary thereof prior to April 2, 2012 shall be considered to be service with an Employer for purposes of determining eligibility to participate in the Plan.

Section 1.2Construction. The titles to the Articles and the headings of the Sections in this Plan are placed herein for convenience of reference only and in case of any conflict the text of

11

this instrument, rather than such titles or headings, shall control. Whenever a noun or pronoun is used in this Plan in plural form and there be only one person or entity within the scope of the word so used, or in singular form and there be more than one person or entity within the scope of the word so used, such noun or pronoun shall have a plural or singular meaning as appropriate under the circumstance.

ARTICLE IIELIGIBILITY AND PARTICIPATION

Section 2.1Eligibility. Each participant in the Plan on December 31, 2012, shall continue as a Participant in this Plan as of January 1, 2013. Each other Covered Employee shall be eligible to become a Participant in the Plan as follows:

(a)For a Covered Employee classified by his or her Employer as employed on a temporary or seasonal basis, he or she may become a Participant in the Plan as of the earlier of • the first day of the Plan Year immediately following his or her completion of a Year of Eligibility Service or • the date six months after the date the Covered Employee completed a Year of Eligibility Service unless he or she experiences a separation from service with his or her Employer before the date referred to in (i) or (ii).

(b)Any other Covered Employee may become a Participant in the Plan as of the first payroll date following his or her Employment Date.

If a Participant ceases to be a Covered Employee, such Participant shall remain a Participant under this Plan but no contributions shall be made to the Plan on his or her behalf while he or she is not a Covered Employee.

Section 2.2Participation. Each Covered Employee who is eligible to participate in the Plan may elect, in the manner prescribed by the Committee, to participate in this Plan as soon as administratively practicable but no later than 31 days following the completion and submission of such election. However, if a Covered Employee who has been notified that he or she is eligible to participate in the Plan on or after February 1, 2012 or who was notified of eligibility prior to this date but never made an affirmative election not to participate in the Plan who fails to return an alternate election pursuant to Section 3.1(a), Pre-Tax Contributions will automatically begin being made on such Covered Employee’s behalf at the rate specified in Section 3.1(a) on the later to occur of (a) the thirtieth day following the Covered Employee’s Employment Date, (b) the thirtieth day following the date such Covered Employee satisfies the eligibility requirements set forth in Section 2.1, or (c) the thirtieth day following the date such Covered Employee is notified of the Plan’s automatic enrollment provisions in accordance with section 401(k)(13)(E)(i) of the Code. A Covered Employee who desires to make an alternate election pursuant to Section 3.1(a) must do so in the manner prescribed by the Committee.

Section 2.3Reemployed Participant. Any Participant who ceases to be a Covered Employee shall thereupon cease to be eligible to participate in the Plan; provided, however, that if any such Participant is thereafter reemployed as a Covered Employee, he or she shall be eligible to

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elect to resume participating in the Plan as of the date of such reemployment. If such Covered Employee was previously automatically enrolled in the Plan, then he or she will be automatically enrolled in the Plan pursuant to Section 3.1(a). Any such Covered Employee who made an affirmative election to participate in the Plan must re-elect to participate in the Plan in accordance with Section 2.2.

ARTICLE IIICONTRIBUTIONS, LIMITATIONS AND FORFEITURES

Section 3.1Pre-Tax and Pre-Tax Bonus Contributions.

(a)Each Participant may elect to have his or her Employer make a Pre-Tax Contribution to the Plan on his or her behalf for each pay period in an amount up to 80% of his or her Basic Compensation for that pay period, subject to any other deductions from the Participant’s Basic Compensation that are required by law or authorized by the Participant pursuant to a compensation reduction agreement. All such contributions shall be made by uniform payroll deductions pursuant to a compensation reduction agreement which authorizes the Employer to pay such contributions to the Trustee on behalf of the Participant. However, for any Participant subject to the Plan’s automatic enrollment provisions (as described in Section 2.2) who fails to make an alternate election, Pre-Tax Contributions will automatically begin being made on such Participant's behalf, in an amount equal to 3% of his or her Basic Compensation on the date specified in Section 2.2 with respect to such Participant. In the event a Participant does not desire to have Pre-Tax Contributions made on his or her behalf at the level set by this Section 3.1(a), the Participant may elect a different amount up to 80% of his or her Basic Compensation in the manner prescribed by the Committee.

(b)In addition, each Participant may elect to have his or her Employer make a Pre-Tax Bonus Contribution to the Plan on his or her behalf in an amount up to 80% of the bonus payable to such Participant under the Employer’s annual bonus program.

(c)The Committee shall establish and maintain for each Participant a Pre-Tax Account All amounts attributable to Pre-Tax Contributions and Pre-Tax Bonus Contributions made by an Employer on behalf of such Participant pursuant to this Section 3.1 (other than those contributions designated as Roth Contributions) shall be credited to such Participant’s Pre-Tax Account.

(d)A Participant may change the applicable percentage of such payroll (or bonus) deductions or suspend his or her election to have Pre-Tax Contributions and/or Pre-Tax Bonus Contributions made to the Plan at any time. Any such change or suspension will be effective as soon as administratively practicable but no later than 31 days following the submission of such change or submission. The default percentage for any Participant who was automatically enrolled in the Plan as set forth in Section 3.1(a) above will increase by a designated percentage point each Plan Year up to a maximum of 5% beginning with March of the Plan Year immediately following the Plan Year in which the default percentage first

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applied to the Participant. Participants who were not automatically enrolled in the Plan will have access to a voluntary default percentage increase program.

(e)A Participant may irrevocably elect in such manner as the Committee may require to have his or her Employer designate all or any portion of a Pre-Tax Contribution or Pre-Tax Bonus Contribution as a designated Roth Contribution. A Participant may change the applicable amount or percentage or suspend such election at any time. Any such change or suspension will be effective as soon as administratively practicable but no later than 31 days following the submission of such change or suspension. Any amount designated as a Roth Contribution shall be treated by the Participant’s Employer as not excludable from the Participant’s gross income.

(f)The Committee shall establish and maintain for each Participant a Roth Account. All amounts attributable to Pre-Tax Contributions or Pre-Tax Bonus Contributions made by an Employer on behalf of such Participant and designated as Roth Contributions pursuant to Section 3.1(e) shall be credited to such Participant’s Roth Account.

(g)Any provision of this Plan to the contrary notwithstanding, the amount of Total Tax-Advantaged Contributions made to the Plan by an Employer on behalf of a Participant for a calendar year when added to the amount of any other elective deferrals within the meaning of Code Section 402(g)(3) made with respect to such Participant pursuant to any other plan, contract or arrangement of an Employer or Affiliated Company for such calendar year shall not exceed the dollar limitation contained in Code Section 402(g) in effect for such calendar year, except to the extent permitted under Section 3.3 of the Plan and Code Section 414(v), if applicable. In the event the limitation of this subsection (g) is exceeded with respect to a Participant for a Plan Year, then if such Participant notifies the Committee of the amount of Total Tax-Advantaged Contributions that exceeded such limitation within such reasonable period of time prior to the first April 15 following such year as the Committee may prescribe in its absolute discretion, the Participant may elect, in accordance with procedures established by the Committee, to have an amount of Pre-Tax Contributions, Pre-Tax Bonus Contributions, and/or Roth Contributions equal to the excess Total Tax-Advantaged Contributions (along with any income allocable thereto) distributed to such Participant no later than such April 15. A Participant will be deemed to have so notified the Committee of excess elective deferrals for a calendar year if, and only to the extent, such excess arises on account of Total Tax-Advantaged Contributions made to this Plan and elective deferrals made to other plans maintained by an Employer or Affiliated Company for such calendar year. Any such excess deferrals distributed to a Participant shall be distributed pursuant to the Participant’s election; provided, however, that if no such election is made, such excess deferrals shall be distributed first from any Pre-Tax Bonus Contributions and then, to the extent necessary, from Pre-Tax Bonus Contributions that are designated as Roth Contributions and then, to the extent necessary, from Pre-Tax Contributions and then from Pre-Tax Contributions that are designated as Roth Contributions. The income allocable to any excess Total Tax-Advantaged Contributions for a Participant for a taxable year shall be the sum of • the income allocable to any excess contributions distributed from his or her Pre-Tax Account, and • the income allocable to any

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excess contributions distributed from his or her Roth Account, where the income allocable to such contributions distributed from either Account for this purpose shall be determined by multiplying the amount of income allocable to such Participant’s Pre-Tax Account or Roth Account for such year by a fraction, the numerator of which is the amount of excess Total Tax-Advantaged Contributions for such year and the denominator of which is the sum of the amount credited to such Participant’s Pre-Tax Account or Roth Account as of the beginning of such year plus the amount of such Participant’s Total Tax-Advantaged Contributions for such year. For Plan Years prior to January 1, 2008, where income allocable to the gap period following the Plan Year but before the date of distribution must be included in determining the income allocable to excess contributions, the income allocable to excess Total Tax-Advantaged Contributions for the gap period following the calendar year will be determined on a date that is no more than 7 days before the distribution. For Plan Years beginning on or after January 1, 2008, income allocable to the gap period will not be distributed. If any portion of a Pre-Tax Contribution, Pre-Tax Bonus Contribution, or Roth Contribution is distributed pursuant to this subsection, any portion of a Matching Contribution (along with any income allocable thereto) made to this Plan for such Participant that matches the distributed Pre-Tax Contribution, Pre-Tax Bonus Contribution, or Roth Contribution shall be forfeited.

(h)An Employer may amend or revoke any Participant’s compensation reduction agreement at any time during a Plan Year if such amendment or revocation is deemed by such Employer to be necessary or appropriate to ensure that all applicable limitations, including those set forth in Sections 3.1(g), 3.7 and 10.3 are met for such year.

Section 3.2Matching Contributions.

(a)Unless provided otherwise in subsection (d) of the Section below, for each pay period an Employer shall make to the Plan for each Participant in its employ a Matching Contribution equal to 200% of the Pre-Tax Contributions and Pre-Tax Contributions designated as Roth Contributions made by the Employer on such Participant’s behalf during such pay period which are not in excess of 5% of such Participant’s Basic Compensation for such pay period.

(b)As of the end of each Plan Year, an Employer shall make to the Plan for each Participant in its employ on the last day of such Plan Year an additional Matching Contribution equal to A minus B, where A is equal to 200% multiplied by the lesser of • the Participant’s Total Tax-Advantaged Contributions for the Plan Year or • 5% of the Participant’s Basic Compensation for the Plan Year, and B is equal to the total amount of Matching Contributions made for the Participant for the Plan Year pursuant to Section 3.2(a); provided, however, that a Participant shall not receive an allocation of an additional Matching Contribution if the amount of such contribution is less than $1.

(c)The Committee shall establish and maintain an Employer Account for each Participant. All Matching Contributions made for a Participant pursuant to this Section shall be credited to such Participant’s Employer Account.

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(d)For each Participant who was employed by Carmeuse Lime, Inc. or a subsidiary thereof and part of a collective bargaining unit as of April 1, 2012, for each pay period an Employer shall make to the Plan for each such Participant in its employ a Matching Contribution as set forth below:

(i)Orange County Union. A Matching Contribution equal to 100% of the first 4% and 50% of the next 2% of Pre-Tax Contributions and Pre-Tax Contributions designated as Roth Contributions made by the Employer on such Participant’s behalf during such pay period which are not in excess of 5% of such Participant’s Basic Compensation for such pay period.

(ii)Glass Rock/Millwood Union. A Matching Contribution equal to 50% of the first 6% of Pre-Tax Contributions and Pre-Tax Contributions designated as Roth Contributions made by the Employer on such Participant’s behalf during such pay period which are not in excess of 3% of such Participant’s Basic Compensation for such pay period.

Section 3.3Catch-Up Contributions. All Employees who are eligible to elect to make Pre-Tax Contributions to this Plan and who have attained age 50 before the close of the taxable year shall be eligible to make Catch-Up Contributions pursuant to a compensation reduction agreement and in accordance with, and subject to the limitations of, Code Section 414(v) and the regulations thereunder. Such Catch-Up Contributions shall not be taken into account for purposes of the provisions of the Plan implementing the required limitations of Code Sections 402(g) and 415. The Plan shall not be treated as failing to satisfy the provisions of the Plan implementing the requirements of Code Sections 401(k)(3), 401(k)(11), 401(k)(12), 410(b), or 416, as applicable, by reason of the making of such Catch-Up Contributions. The Committee may permit a Covered Employee to elect to have his or her Employer treat any amount or whole percentage of his or her Catch-Up Contributions as Roth contributions. Catch-Up Contributions made by an Employer on behalf of a Participant pursuant to this Section 3.3 shall be credited to such Participant’s Catch-Up Contribution Account; provided, however, that Catch-Up Contributions that are designated as Roth contributions shall be credited to such Participant’s Roth Catch-Up Contribution Account.

Section 3.4After-Tax Contributions.

(a)Each Participant may elect to make an After-Tax Contribution to the Plan for each pay period in an amount which, when combined with any Pre-Tax Contributions made to the Plan on behalf of such Participant for that pay period, shall not exceed 80% of the Basic Compensation of such Participant during such pay period, subject to any other deductions from the Participant’s Basic Compensation that are required by law or authorized by the Participant pursuant to a compensation reduction agreement.

(b)The Committee shall establish and maintain for each Participant an After- Tax Account. All amounts attributable to After-Tax Contributions made by a Participant pursuant to this Section 3.4 shall be credited to such Participant’s After-Tax Account.

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(c)After-Tax Contributions may be made by uniform payroll deductions which the Participant authorizes his or her Employer, in the manner prescribed by the Committee, to withhold and pay over to the Trustee. A Participant may change the applicable percentage of such payroll deductions or suspend his or her election to have After-Tax Contributions made to the Plan at any time. Any such change or suspension will be effective as soon as administratively practicable but no later than 31 days following the submission of such change or suspension.

(d)At any time and from time to time during a Plan Year, the Company may limit the After-Tax Contributions made by a Participant or suspend the making of After-Tax Contributions if the Company, in its absolute discretion, deems such to be necessary or appropriate to ensure that all applicable limitations, including those set forth in Sections 3.7 and 10.3, are satisfied for such year.

Section 3.5Payment for Contributions. Pre-Tax Contributions, Catch-Up Contributions, and After-Tax Contributions made to the Plan by an Employer for or on behalf of Participants for a pay period shall be paid to the Trustee in cash as soon as practicable after such pay period ends, but no later than the 15th business day after the end of the month in which such pay period ends. Pre-Tax Bonus Contributions made to the Plan for or on behalf of Participants shall be paid to the Trustee in cash as soon as practicable after the bonus payment is made, but no later than the 15th day of the month after the end of the month in which such bonus payment is made. Matching Contributions made to the Plan for a pay period pursuant to Section 3.2(a) shall be paid to the Trustee as soon as practicable, but no later than 30 days after the end of the month in which such pay period ends. Matching Contributions made to the Plan for a Plan Year pursuant to Section 3.2(b) shall be paid to the Trustee no later than the time prescribed by law, including extensions thereof, for the filing of such Employer’s federal income tax return for such year.

Section 3.6Return of Employer Contributions. Contributions made to this Plan are conditioned upon being currently deductible under Code Section 404. Any provision of this Plan to the contrary notwithstanding, upon an Employer’s request, any such contribution or portion thereof made to this Plan by such Employer which • was made under a mistake of fact which is subsequently discovered, or • is disallowed as a deduction under Code Section 404, shall be returned to such Employer to the extent not previously distributed to Participants or their beneficiaries; provided, however, that the amounts returnable to an Employer pursuant to this Section shall be reduced by any Trust losses allocable thereto and shall be returned to such Employer only if such return is made within one year after the mistaken payment of the contribution or the date of the disallowance of the deduction, as the case may be. Except as provided in this Section, no contribution made by an Employer pursuant to this Plan shall ever revert to or be recoverable by any Employer.

Section 3.7Nondiscrimination Testing.

(a)Any provision of this Plan to the contrary notwithstanding, if for any Plan Year the actual deferral percentage for the group of Highly Compensated Employees eligible to elect to have Pre-Tax Contributions, Pre-Tax Bonus Contributions, or Roth Contributions made during such Plan Year fails to satisfy one of the following tests:

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(i)the actual deferral percentage for said group of Highly Compensated Employees is not more than 1.25 times the actual deferral percentage for the preceding Plan Year for all Non-Highly Compensated Employees eligible during the preceding Plan Year to elect to have Pre-Tax Contributions, Pre-Tax Bonus Contributions, or Roth Contributions made on their behalf, or

(ii)the excess of the actual deferral percentage for said group of Highly Compensated Employees over the actual deferral percentage for the preceding Plan Year for all Non-Highly Compensated Employees eligible during the preceding Plan Year to elect to have Pre-Tax Contributions, Pre-Tax Bonus Contributions, or Roth Contributions made on their behalf is not more than two percentage points, and the actual deferral percentage for said group of Highly Compensated Employees is not more than two times the actual deferral percentage for the preceding year for all Non-Highly Compensated Employees eligible during the preceding Plan Year to elect to have Pre-Tax Contributions, Pre-Tax Bonus Contributions, or Roth Contributions made on their behalf,

then the actual deferral percentage of Participants who are members of said group of Highly Compensated Employees shall be reduced by reducing the actual deferral percentages of the Highly Compensated Employees with the largest individual actual deferral percentages to the largest uniform actual deferral percentage (commencing with the Highly Compensated Employee with the largest actual deferral percentage and reducing his or her actual deferral percentage to the extent necessary to satisfy one of the above tests or to lower such actual deferral percentage to the actual deferral percentage of the Highly Compensated Employee with the next largest actual deferral percentage, and repeating this process as necessary) that permits the actual deferral percentage for said group of Highly Compensated Employees to satisfy one of said tests. For purposes of this subsection (a), the term “actual deferral percentage” for a specified group of Employees for a Plan Year means the average of the ratios (calculated separately for each Employee in such group and after any distributions to Highly Compensated Employees required to satisfy the limitation imposed by Code Section 402(g)) of (i) the aggregate amount of Total Tax-Advantaged Contributions made on behalf of each such Employee for that year, to (ii) the amount of such Employee’s Compensation for that year or, in the Committee’s discretion, only for such portion of that year during which the Employee was eligible to participate in the Plan. If two or more plans that include cash or deferred arrangements are considered as one plan for purposes of Code Sections 401(a)(4) or 410(b) (other than for purposes of the average benefit percentage test), the cash or deferred arrangements included in such plans shall be treated as one arrangement for purposes of this subsection (a). If a Highly Compensated Employee is a participant in two or more cash or deferred arrangements maintained by an Employer or Affiliated Company, then for purposes of this Section, all such cash or deferred arrangements (other than those that may not be permissively aggregated) shall be treated as one cash or deferred arrangement in accordance with applicable regulations.

(b)The aggregate amount of any Total Tax-Advantaged Contributions which may not be credited to Pre-Tax Accounts and Roth Accounts for a Plan Year because of the

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limitation contained in subsection (a) of this Section, calculated by adding together the dollar amount of excess contributions determined in subsection (a) of this Section for each affected Highly Compensated Employee, shall be distributed to Highly Compensated Employees (along with any income allocable to such excess contributions for the Plan Year) no later than the last day of the Plan Year immediately following such year (and, if practicable, within 2½ months after the end of such year). The amount of Total Tax-Advantaged Contributions to be distributed to a particular Highly Compensated Employee shall be determined on the basis of the amount of Total Tax-Advantaged Contributions made for each Highly Compensated Employee commencing with the Highly Compensated Employee with the largest amount of Total Tax- Advantaged Contributions for such Plan Year and reducing his or her Total Tax- Advantaged Contributions to the extent necessary to lower such amount to the amount of Total Tax-Advantaged Contributions of the Highly Compensated Employee with the next largest amount of Total Tax-Advantaged Contributions, and repeating this process as necessary to distribute such aggregate amount; provided, however, that the amount of Total Tax-Advantaged Contributions to be distributed shall first be reduced by any excess deferrals to be distributed pursuant to Code Section 402(g). A Participant may elect, in accordance with procedures established by the Committee, an amount of Pre-Tax Contributions, Pre-Tax Bonus Contributions, and/or Roth Contributions equal to the excess contributions which shall be distributed to such Participant (along with any income allocable thereto); provided, however, that if a Participant does not make such an election, any such excess contribution shall be distributed first from any Pre-Tax Bonus Contributions and then, to the extent necessary, from any Pre-Tax Bonus Contributions designated as Roth Contributions and then, to the extent necessary, from any Pre-Tax Contributions and then, to the extent necessary, from any Pre-Tax Contributions designated as Roth Contributions. The income allocable to any such excess contributions for a Participant for a Plan Year shall equal the sum of • the income allocable to any excess contributions distributed from his or her Pre-Tax Account, and • the income allocable to any excess contributions from his or her Roth Account, where the income allocable to excess contributions distributed from either such Account for this purpose shall be determined by multiplying the amount of income allocable to such Participant’s Pre-Tax Account or Roth Account, whichever is applicable, for such year by a fraction, the numerator of which is the amount of the excess contributions for such year and the denominator of which is the sum of the amount credited to such Participant’s Pre-Tax Account or Roth Account as of the beginning of such year plus the amount of such Participant’s Total Tax-Advantaged Contributions for such year. For Plan Years prior to January 1, 2008, where income allocable to the gap period following the Plan Year but before the date of distribution must be included in determining the income allocable to excess contributions, the income allocable to excess Total Tax-Advantaged Contributions for the gap period following the calendar year will be determined on a date that is no more than 7 days before the distribution. For Plan Years beginning on or after January 1, 2008, income allocable to the gap period will not be distributed. Any provision of this Plan to the contrary notwithstanding, Total Tax-Advantaged Contributions otherwise distributable pursuant to this subsection (b) to a Participant who is eligible to make Catch-Up Contributions to the Plan may, to the extent permitted by Code Section 414(v) and the regulations thereunder, be treated by the Committee as a Catch-Up Contribution. If any portion of a Pre-Tax Contribution, Pre-Tax Bonus Contribution, or Roth Contribution made

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by an Employer on behalf of a Participant is distributed to such Participant or is treated as a Catch-Up Contribution pursuant to the foregoing provisions of this subsection (b), any portion of a Matching Contribution (along with any income allocable thereto) made for such Participant that matches the distributed Pre-Tax Contribution, Pre-Tax Bonus Contribution, or recharacterized Catch-Up Contribution shall be forfeited.

(c)Any provision of this Plan to the contrary notwithstanding, if for any Plan Year the contribution percentage for the group of Highly Compensated Employees eligible to receive an allocation of Matching Contributions or to make After-Tax Contributions to the Plan for such Plan Year fails to satisfy one of the following tests:

(iv)the contribution percentage for said group of Highly Compensated Employees is not more than 1.25 times the contribution percentage for the preceding Plan Year for all Non-Highly Compensated Employees eligible for the preceding Plan Year to receive an allocation of Matching Contributions or make After-Tax Contributions, or

(v)the excess of the contribution percentage for said group of Highly Compensated Employees over the contribution percentage for the preceding Plan Year for all Non-Highly Compensated Employees eligible for the preceding Plan Year to receive an allocation of Matching Contributions or make After-Tax Contributions is not more than two percentage points, and the contribution percentage for said group of Highly Compensated Employees is not more than two times the contribution percentage for the preceding Plan Year for all Non-Highly Compensated Employees eligible for the preceding Plan Year to receive an allocation of Matching Contributions or make After-Tax Contributions,

then the contribution percentage of Participants who are members of said group of Highly Compensated Employees shall be reduced by reducing the contribution percentages of the Highly Compensated Employees with the largest individual contribution percentages to the largest uniform contribution percentage (commencing with the Highly Compensated Employee with the largest contribution percentage and reducing his or her contribution percentage to the extent necessary to satisfy one of the above tests or to lower such contribution percentage to the contribution percentage of the Highly Compensated Employee with the next largest contribution percentage, and repeating this process as necessary) that permits the contribution percentage for said group of Highly Compensated Employees to satisfy one of said tests. For purposes of this subsection (c), the term “contribution percentage” for a specified group of Employees for a Plan Year means the average of the ratios (calculated separately for each Employee in such group and after application of the reduction provisions of subsection (a) and the forfeiture provisions of subsection (b) of this Section) of (i) the aggregate amount of After-Tax Contributions and Matching Contributions made by or for such Employee (and, at the election of the Committee, the Total Tax-Advantaged Contributions made on behalf of such Employee) for that year, to (ii) the amount of such Employee’s Compensation for that year or, in the Committee’s discretion, only for such portion of that year during which the Employee was

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eligible to participate in the Plan. If two or more plans to which matching contributions or employee after-tax contributions are made are considered as one plan for purposes of Code Section 410(b) (other than for purposes of the average benefit percentage test), such plans shall be treated as one plan for purposes of determining the contribution percentages for this subsection (c). If a Highly Compensated Employee is a participant in two or more plans maintained by an Employer or Affiliated Company to which matching contributions or employee after-tax contributions are made, then for purposes of this Section, all such plans (other than those that may not be permissively aggregated) shall be treated as one plan in accordance with applicable regulations.

(d)The aggregate amount of any Matching Contributions and After-Tax Contributions which may not be credited to Participant’s Accounts for a Plan Year because of the limitation contained in subsection (c) of this Section, calculated by adding together the dollar amount of excess aggregate contributions determined in subsection (c) of this Section for each affected Highly Compensated Employee, shall be forfeited if forfeitable, but if not forfeitable, distributed to such Highly Compensated Employees (along with any income allocable to such excess aggregate contributions) no later than the last day of the Plan Year immediately following such year (and, if practicable, within 2½ months after the end of such year). The amount to be distributed to a particular Highly Compensated Employee shall be determined on the basis of the amount of Matching Contributions and After-Tax Contributions made by or for each such Highly Compensated Employee commencing with the Highly Compensated Employee with the largest amount of Matching Contributions and After-Tax Contributions for such Plan Year and reducing first his or her After-Tax Contributions and then, if necessary, Matching Contributions to the extent necessary to lower such total amount to the amount of Matching Contributions and After-Tax Contributions of the Highly Compensated Employee with the next largest amount of Matching Contributions and After-Tax Contributions, and repeating this process as necessary to distribute such aggregate amount. The income allocable to any such excess aggregate contributions for a Participant for a Plan Year shall be determined by multiplying the amount of income allocable to such Participant’s Employer Account or After-Tax Account, whichever is applicable, for such year by a fraction, the numerator of which is the amount of the excess aggregate contributions for such year and the denominator of which is the sum of the amount credited to such Participant’s Employer Account or After-Tax Account, whichever is applicable, as of the beginning of such year plus the amount of Matching Contributions or After-Tax Contributions, as applicable, made for such Participant for such year. For Plan Years prior to January 1, 2008, where income allocable to the gap period following the Plan Year but before the date of distribution must be included in determining the income allocable to excess aggregate contributions, the income allocable to excess aggregate contributions for the gap period following the calendar year will be determined on a date that is no more than 7 days before the distribution. For Plan Years beginning on or after January 1, 2008, income allocable to the gap period will not be distributed.

(e)Any provision of this Section to the contrary notwithstanding, the Company in its discretion may cause the provisions of subsections (a) and (c) of this Section to be satisfied without use of the corrective provisions set forth in subsections (b) and (d) of this

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Section by requiring each Employer to make a qualified non-elective contribution and/or a qualified matching contribution to the Plan to be allocated to the Pre-Tax Accounts (with respect to a contribution intended to be taken into account for purposes of determining the actual deferral percentage pursuant to subsection (a)) or the Employer Accounts (with respect to a contribution intended to be taken into account for purposes of determining the contribution percentage pursuant to subsection (c)) of those Participants who were Non-Highly Compensated Employees in the employ of (or on authorized leave of absence from) an Employer on the last day of such Plan Year. A qualified non-elective contribution shall be allocated to the eligible Participants in the proportion that the Basic Compensation of each such eligible Participant while both a Participant and a Covered Employee during that year bears to the Basic Compensation of all such eligible Participants while both Participants and Covered Employees during that year. A qualified matching contribution shall be allocated to the eligible Participants in the proportion that the Pre-Tax Contributions made with respect to each such eligible Participant for such Plan Year bears to the Pre-Tax Contributions made with respect to all such eligible Participants for such Plan Year. Any qualified non-elective contribution or qualified matching contribution will be made within the limits specified in applicable regulations.

(f)Any provision of this Plan to the contrary notwithstanding, the determination of the actual deferral percentage and the contribution percentage required by this Section for Non-Highly Compensated Employees for the preceding Plan Year shall be made in accordance with Code Sections 401(k) and 401(m) and any regulations or other authorities issued thereunder.

Section 3.8Application of Forfeitures. As soon as practicable after the valuation of all Accounts at the end of each Plan Year, all amounts forfeited during that Plan Year shall first be applied to restore any forfeited Accounts required to be restored pursuant to Sections 6.5 and 6.8, and any forfeitures in excess of the amount needed to restore any such Account may be applied to pay administrative expenses in accordance with Section 7.4. Any remaining forfeitures for such Plan Year, if any, shall be used to reduce the amount of the earliest subsequent Matching Contributions an Employer otherwise would be required to make to the Plan.

Section 3.9Rollover Contributions. With the consent of and subject to such reasonable limitations as may be imposed by the Committee or its delegate, a Covered Employee may make a Rollover Contribution to the Plan as follows:

(a)a direct rollover of an eligible rollover distribution, including a distribution consisting of Roth Rollover Property and outstanding loans only from the Carmeuse Lime Inc. 401(k) Plan, from: (i) a qualified plan described in Code Section 401(a) or 403(a), including after tax employee contributions, (ii) an annuity contract described in Code Section 403(b), excluding after tax employee contributions, or (iii) an eligible plan under Code Section 457(b) which is maintained by a state, political subdivision of a state, or any agency or instrumentality of a state or political subdivision of a state; or

(b)a contribution by the Covered Employee of an eligible rollover distribution, excluding any distribution consisting of amounts designated as Roth contributions, from: •

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a qualified plan described in Code Section 401(a) or 403(a), • an annuity contract described in Code Section 403(b), or • an eligible plan under Code Section 457(b) which is maintained by a state, political subdivision of a state, or any agency or instrumentality of a state or political subdivision of a state; or

(c)a contribution by the Covered Employee of the portion of a distribution from an individual retirement account or annuity described in Code Section 408(a) or 408(b) that is eligible to be rolled over, excluding any amounts designated as Roth contributions, and that would otherwise be includible in gross income of the Covered Employee.

Amounts attributable to Roth Rollover Property shall be credited to a separate Roth Rollover Account to be established and maintained for the benefit of the contributing Covered Employee. All other Rollover Contribution amounts shall be credited to a separate Rollover Account to be established and maintained for the benefit of the contributing Covered Employee. A Covered Employee who is not a Participant, but for whom a Rollover Account or Roth Rollover Account is being maintained, shall be accorded all of the rights and privileges of a Participant under the Plan except that no contributions shall be made to the Plan by or for such Employee until he or she meets the eligibility and participation requirements of Article II.

ARTICLE IVTRUST FUND AND VALUATIONS

Section 4.1Trust and Trustee. All of the contributions paid to the Trustee pursuant to this Plan and the Superseded Plan, together with the income therefrom and the increments thereof, shall be held in trust by the Trustee under the terms and provisions of the separate trust agreement between the Trustee and the Company, a copy of which is attached hereto and incorporated herein by this reference for all purposes, establishing a trust fund known as the PIONEER NATURAL RESOURCES USA, INC. 401(k) AND MATCHING TRUST for the exclusive benefit of the Participants and their beneficiaries.

Section 4.2Trust Divestment Options. For investment purposes the Trust shall be divided into the Pioneer Stock Investment Fund, which shall be a common fund invested in Pioneer Stock, and such number and kind of other separate and distinct Investment Funds as the Committee shall determine in its absolute discretion; however, the Committee shall offer at least three Investment Funds in addition to the Pioneer Stock Investment Fund, each of which options is diversified and has materially different risk and return characteristics. The Trust assets allocated to a particular Investment Fund other than the Pioneer Stock Investment Fund shall be invested by the Trustee and/or one or more investment managers duly appointed in accordance with the provisions of the Trust, as the case may be, in such type of property, whether real, personal or mixed, as the Trustee is directed to acquire and hold for such Investment Fund. Dividends and other amounts received with respect to Pioneer Stock held in the Pioneer Stock Investment Fund shall be invested in Pioneer Stock. The assets of the Trust allocated to a particular Investment Fund shall be invested by the Trustee and/or one or more investment managers duly appointed in accordance with the provisions of the trust agreement establishing the Trust, as the case may be, in such type of property acceptable to the Trustee as the Trustee is directed to acquire and hold for such Investment Fund. Upon

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becoming a Participant in the Plan, each Participant shall direct, in the manner prescribed by the Committee, that all amounts credited to his or her Accounts under the Plan shall be invested, in percentage multiples authorized by the Committee, in one or more of the Investment Funds. The Plan must provide reasonable divestment and reinvestment opportunities at least quarterly. Except as provided in regulations, the Plan may not impose restrictions or conditions on the investments in the Pioneer Stock Investment Fund that the Plan does not impose on the investment of other Plan assets, other than restrictions or conditions imposed by reason of the application of securities laws or a condition permitted under Internal Revenue Service Notice 2006-107 or other applicable guidance. In the absence of such direction, the Participant will be deemed to have directed that his or her Accounts under the Plan be invested in life-cycle of targeted-retirement-date fund or account within the meaning of Department of Labor Regulations Section 2550.404c-5(e)(4)(i). In accordance with final Department of Labor regulations, the Committee will provide each Participant with a notice, at least 30 days prior to the beginning of each Plan Year, which explains the Participant’s right under the Plan to designate how contributions and earnings will be invested and explaining how in the absence of any investment election by the Participant, such contributions and earnings will be invested in a default investment fund. Subject to such conditions and limitations as the Committee in its absolute discretion may prescribe from time to time for application to all Participants on a uniform basis, a Participant may change his or her investment direction with respect to future contributions or redirect the investment of the amounts credited to his or her Accounts each business day to be effective as soon as is administratively practicable.

Section 4.3Valuation and Adjustment of Accounts. As of each Valuation Date, the Trustee shall determine the fair market value of all assets of the Trust with the value of the assets of each Investment Fund being separately determined. On the basis of such valuations and in accordance with such procedures as may be specified from time to time by the Committee, the portion of each Account invested in a particular Investment Fund shall be adjusted by the Committee to reflect its proportionate share of the income collected and accrued, realized and unrealized profits and losses, expenses and all other transactions attributable to that particular Investment Fund for the valuation period then ended. The amount of any distribution, withdrawal or forfeiture shall be determined on the basis of the most recent valuation preceding the date of distribution, withdrawal or forfeiture, as the case may be.

Section 4.4Participant Statements. The Trustee will distribute to each Participant, in written or electronic form and at least once every calendar quarter, a benefit statement setting forth the following information with respect to a participant’s accounts: (a) the value of the assets credited to such accounts as of the most recent Valuation Date; (b) an explanation of any restrictions on investment decisions; (c) an explanation of the importance of a well-balanced and diversified portfolio, including a statement about the risk of holding more than twenty percent (20%) of such account in the security of a single entity; (d) an indication of the Participant’s vesting status (updated annually); and (e) a notice directing the Participant to the Department of Labor’s website for information on investing and diversification.

ARTICLE VVESTING

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Section 5.1Fully Vested Accounts. The amounts credited to a Participant’s After-Tax Account, Catch-Up Contribution Account, Mesa After-Tax Account, Mesa Premium Account, Mesa Profit-Sharing Account, Pre-Tax Account, Prior Plan Employer Account, Prior Plan Pre-Tax Account, Rollover Account, Roth Account, Roth Catch-Up Contribution, Roth Rollover Account and In-Plan Roth Rollover Contribution Account shall be fully vested at all times.

Section 5.2Vesting of Employer Account.

(e)The amounts credited to the Employer Account and Matching Plan Account of a Participant shall become fully vested upon the occurrence of any of the following events while the Participant is in the employ of, on authorized leave of absence from an Employer or Affiliated Company: (1) the completion of an Hour of Service by the Participant on or after the date he or she attains age 60, (2) the Participant’s death, or (3) the Participant’s Permanent Disability. Further, the amounts credited to the Employer Account and Matching Plan Account of a Participant who dies while performing qualified military service (as defined in Code Section 414(u)) on or after January 1, 2007 also shall become fully vested as if an Employee. Unless sooner vested pursuant to the preceding sentence, and except as provided in subsections (b) and (c) of this Section and Section 5.3, the amounts credited to a Participant’s Employer Account and Matching Plan Account shall vest in accordance with the following schedule:

Period of Service Completed by Participant	Percentage Vested
Less than 1 year	None
1 year	25%
2 years	50%
3 years	75%
4 or more years	100%

(f)If a Participant makes an in-service withdrawal under Section 6.6 from his or her Employer Account at a time when the Participant is not fully vested, the Participant’s vested amount in such account on any date thereafter shall be an amount X determined by the following formula: X = P(AB + D) - D. For purposes of this formula, P is the Participant’s vested percentage under the Plan’s vesting schedule on the relevant date, AB is the account balance on the relevant date and D is the amount of the Participant’s in-service withdrawal.

(g)Unless sooner vested pursuant to subsection (a) of this Section, for Participants who were employed by Carmeuse Lime, Inc. or a subsidiary thereof and part of a collective bargaining unit as of April 1, 2012, the amounts credited to that Participant’s Employer Account and Matching Plan Account shall vest in accordance with the following schedule:

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Period of Service Completed by Participant	Percentage Vested
Less than 1 year	0%
1 year but less than 2 years	33%
2 years but less than 3 years	67%
3 or more years	100%

Section 5.3Special Vesting Provisions.

(a)Any provision of this Plan to the contrary notwithstanding, the amounts credited to the Employer Account and/or Matching Plan Account of a Participant who is specifically designated by the Vice President Administration of the Company as being involuntarily terminated in connection with the divestiture program and corporate restructuring announced on February 10, 1998, shall become fully vested and nonforfeitable on the date of such involuntary termination.

(b)Any provision of this Plan to the contrary notwithstanding, the amounts credited to the Employer Account and/or Matching Plan Account of a Participant who is specifically designated by the Vice President Administration of the Company as being involuntarily terminated in connection with the corporate restructuring announced on November 11, 1998, shall become fully vested and nonforfeitable on the date of such involuntary termination.

(c)Any provision of this Plan to the contrary notwithstanding, the amounts credited to the Matching Plan Account of a Participant who is specifically designated by the Vice President-Administration of the Company as being involuntarily terminated in connection with the sale by the Company of the Plum Creek Plant, Leon County, Texas, to a third party shall become fully vested and nonforfeitable on the date of such involuntary termination.

(d)Any provision of this Plan to the contrary notwithstanding, the amounts credited to the Matching Plan Account of a Participant who is specifically designated by the Vice President-Administration and Risk Management of the Company as being involuntarily terminated in connection with one of the following events shall become fully vested and nonforfeitable on the date of such involuntary termination:

(i)the transfer of operations of the Howard Parker/Joe Parsley Joint Venture wells to a third party, 1999;

(ii)the sale of Iatan Field properties to a third party;

(iii)the reorganization of Offshore Operations effective September 22,

(iv)the restructuring and consolidation of the Domestic Reservoir Engineering Department effective February 15, 2000; or

(v)the sale of NationsBank building, Midland, Texas.

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(e)Any provision of this Plan to the contrary notwithstanding, the amounts credited to the Matching Plan Account of a Participant who is specifically designated by the Vice President-Administration and Risk Management of the Company as being involuntarily terminated in connection with the implementation of the TOW Production System technology, shall become fully vested and nonforfeitable on the date of such involuntary termination.

(f)Any provision of this Plan to the contrary notwithstanding, the amounts credited to the Employer Account of a Participant who is specifically designated by the Vice President Administration of the Company as being involuntarily terminated in connection with the closing on or about June 24, 2005 of the Castlegate office located in Price, Utah shall become fully vested and nonforfeitable on the date of such involuntary termination.

(g)Any provision of this Plan to the contrary notwithstanding, the amounts credited to the Employer Account of a Participant who is specifically designated by the Vice President Administration of the Company as being involuntarily terminated in connection with the sale of all eases, wells and equipment associated with the Timbalier Bay and Grand Bay Fields in Louisiana shall become fully vested and nonforfeitable on the date of such involuntary termination.

(h)Any provision of this Plan to the contrary notwithstanding, the amounts credited to the Employer Account of a Participant who is specifically designated by the Vice President Administration of the Company as being involuntarily terminated in connection with the reorganization of the Human Resources Department establishing a Regional HR Manager position located in Denver, Colorado shall become fully vested and nonforfeitable on the date of such involuntary termination.

ARTICLE VIVALUATIONS, DISTRIBUTIONS AND WITHDRAWALS

Section 6.1Time of Distribution.

(h)Unless a Participant elects otherwise, distribution to the Participant or a beneficiary under this Article shall be made or commence being made no later than 60 days after the close of the Plan Year in which the latest of the following occurs: •) the Participant’s Normal Retirement Date, • the tenth anniversary of the year in which the Participant commenced participation in the Plan, or • the Participant’s separation from the employment of an Employer for any reason other than his or her transfer to the employment of another Employer or Affiliated Company. Notwithstanding the foregoing, the failure of a Participant to consent to a distribution hereunder shall be deemed to be an affirmative election to defer commencement of such distribution.

(i)Any provision of this Plan to the contrary notwithstanding, a Participant’s entire interest shall be distributed, or begin to be distributed, to the Participant no later than the Participant’s Required Beginning Date. For a Participant who is a 5% owner (as defined

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in Code Section 416(i)), the “Required Beginning Date” is April 1 of the calendar year following the calendar year such Participant attains age 70½. For a Participant who is not a 5% owner (as defined in Code Section 416(i)), the “Required Beginning Date” is April 1 of the calendar year following the later of the calendar year in which the Participant attains age 70½ or retires. Distributions that commence being made pursuant to this Section 6.1(b) shall be made pursuant to Section 6.2 (excluding Section 6.2(c)) in accordance with the minimum distribution requirements of Code Section 401(a)(9) and such regulations thereunder as may be applicable from time to time; provided, however, that if the Participant elects to waive the normal form of payment in accordance with Section 6.2(b) with respect to such Participant’s Matching Plan Account, Mesa Premium Account, Prior Plan Employer Account or Prior Plan Pre-Tax Account, the alternative form of distribution shall be the minimum amounts required to be distributed pursuant to Code Section 401(a)(9) and such regulations thereunder as may be applicable from time to time, with any amount remaining upon the death of the Participant to be paid in accordance with Section 6.3. Any Participant who attained age 70½ prior to January 1, 1999, and who elected to continue to receive distributions prior to such Participant’s termination of employment shall be entitled receive an annual distribution in accordance with the preceding sentence (or may elect a larger or smaller amount for such annual distribution) unless and until such Participant revokes such election.

(j)Subject to the provision of this Article requiring that distributions and withdrawals be made in the form of an annuity contract, distributions and withdrawals shall be made in cash, except that amounts credited to an Account that are invested in the Pioneer Stock Investment Fund may, at the election of the Participant, be distributed in the form of Pioneer Stock with cash in lieu of fractional shares.

(k)Any provision of this Plan to the contrary notwithstanding, all distributions from this Plan are intended to satisfy the statutory rules of Code Section 401(a)(9), including the incidental death benefit requirement in Code Section 401(a)(9)(G), as well as Treasury Regulations Sections 1.401(a)(9)-2 through 1.401(a)(9)-9 and other applicable rules related to Code Section 401(a)(9) that are prescribed by the Commissioner of the Internal Revenue Service in revenue ridings, notices and other guidance published in the Internal Revenue Bulletin. If any provision of the Plan is not consistent with those statutory rules, regulations and other guidance, then the statutory rules, regulations and other guidance related to Code Section 401(a)(9) will override that provision of the Plan to the extent the provision is not consistent with Code Section 401(a)(9).

(l)Any provision of this Plan to the contrary notwithstanding, all optional forms of benefit under the Plan, the Superseded Plan, the Matching Plan, the Mesa Premium Plan, and the Mesa Profit-Sharing Plan that are protected benefits under Code Section 411(d)(6) shall continue to be optional forms of benefit for Participants to whom such optional forms of benefit apply notwithstanding any subsequent amendment purporting to revise or delete any such optional form of benefit, except to the extent that such optional forms of benefit may be deleted in accordance with applicable law.

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(m)Notwithstanding the other provisions of this Article, distributions may be made under a designation made before January 1, 1984, in accordance with Section 242(b)(2) of the Tax Equity and Fiscal Responsibility Act (“TEFRA”) and the provisions of the Plan that relate to TEFRA Section 242(b)(2).

(n)In accordance with Section 6.1(d) of the Plan, for calendar year 2009, required minimum distributions will be made under the Plan as set forth in Section 6.1(d) unless otherwise elected by the Participant. If a Participant receives his or her required minimum distribution for calendar year 2009, the Participant has the option of exercising his or her direct rollover right to an eligible retirement plan as discussed under Section 6.11.

Section 6.2Distribution of Retirement and Disability Benefits.

(i)Except as otherwise provided in this Section, upon the Retirement or termination of employment on account of Permanent Disability of a Participant, the Vested Interest of such Participant shall be distributed to such Participant by the Trustee at the direction of the Committee in a lump sum distribution; provided, however, that if such Participant’s Vested Interest exceeds $5,000, he or she may elect to receive his or her Vested Interest in monthly, quarterly or annual installment distributions over a period of two or more years with the first such installment to be payable within 90 days after the end of the Plan Year in which the Participant’s employment terminates. Such installment payments may be made over a period of years not to exceed one or a combination of the following periods: • the life of the Participant, • the lives of the Participant and his or her designated beneficiary, • a period certain not extending beyond the life expectancy of the Participant, and • a period certain not extending beyond the joint life and last survivor expectancy of the Participant and his or her designated beneficiary. Any provision of Section 6.3 to the contrary notwithstanding, if a Participant who elected installment payments dies prior to the distribution of the entire amount of his or her Vested Interest, the remaining portion thereof shall be distributed to his or her beneficiary or beneficiaries, as determined in accordance with Section 6.3(a), in a single distribution within 90 days after the end of the Plan Year during which the Participant died. For purposes of determining whether the value of a Participant’s Vested Interest exceeds or does not exceed $5,000, the value of a Participant’s Vested Interest shall be determined without regard to the value of the Participant’s Rollover Account or Roth Rollover Account.

(j)Except as otherwise provided in this subsection (b), upon the Retirement or termination of employment on account of Permanent Disability of a Participant whose Vested Interest exceeds $5,000, such Participant’s Matching Plan Account, Mesa Premium Account, Prior Plan Employer Account and Prior Plan Pre-Tax Account shall be distributed to him or her by the Trustee at the direction of the Committee in the form of a Qualified Joint and Survivor Annuity contract to be purchased from a company selected by the Committee and commencing in payment as soon as practicable. Not more than 180 days prior to the date such annuity contract is to commence in payment, the Committee shall provide such Participant with a written explanation of • the terms and conditions of the Qualified Joint and Survivor Annuity and Qualified Optional Survivor Annuity, • his or her right to make,

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and the effect of, an election to waive the Qualified Joint and Survivor Annuity or Qualified Optional Survivor Annuity form of benefit, • the rights of his or her Spouse with respect to the receipt and waiver of the Qualified Joint and Survivor Annuity and Qualified Optional Survivor Annuity, and • the right to make, and the effect of, a revocation of an election to waive the Qualified Joint and Survivor Annuity and Qualified Optional Survivor Annuity. The written explanation shall be required at least 30 days prior to the date the Qualified Joint and Survivor Annuity contract is to commence in payment; provided, however, that a Participant may elect (with any applicable spousal consent) to waive such requirement if the distribution to the Participant commences no earlier than 8 days after such explanation is provided. After receiving the written explanation, the Participant may elect at any time during the 180-day period ending on the date the annuity contract is to commence in payment to waive the Qualified Joint and Survivor Annuity form of benefit and also may revoke any such election during such period. Any such election to waive a Qualified Joint and Survivor Annuity form of benefit by a married Participant will be effective only if the Spouse of such Participant consents in writing within the 180-day period preceding such date to both the election and the optional form of benefit selected by the Participant and such consent is witnessed by a notary public. Any amount payable from the Matching Plan Account, Mesa Premium Account, Prior Plan Employer Account or Prior Plan Pre-Tax Account upon the Retirement or Permanent Disability of a Participant who has elected to waive the Qualified Joint and Survivor Annuity form of benefit as provided above shall be distributed to such Participant by the Trustee at the direction of the Committee in accordance with subsection (a) of this Section; provided, however, that a Participant who has an amount payable from his or her Matching Plan Account or Mesa Premium Account may, in addition to the optional forms available under subsection (a), elect to have such amounts paid in the form of an Alternate Qualified Joint and Survivor Annuity or a Qualified Optional Survivor Annuity. For purposes of determining whether the value of a Participant’s Vested Interest exceeds $5,000, the value of a Participant’s Vested Interest shall be determined without regard to the value of the Participant’s Rollover Account or Roth Rollover Account.

(k)Notwithstanding the foregoing provisions of this Section 6.2, if upon a Participant’s Retirement or termination of employment on account of Permanent Disability the Participant’s Vested Interest exceeds $5,000, no distribution shall be made with respect to such Participant’s Vested Interest unless and until the Participant elects to receive such distribution. An election made by a Participant under this Section 6.2(c) to receive a distribution may be made with respect to all or a portion of such Participant’s Vested Interest. A Participant who elects to receive a distribution of less than his or her entire Vested Interest may elect subsequent distributions with respect to his or her remaining Vested Interest. For purposes of determining whether the value of a Participant’s Vested Interest exceeds or does not exceed $5,000, the value of a Participant’s Vested Interest shall be determined without regard to the value of the Participant’s Rollover Account or Roth Rollover Account.

Section 6.3Distribution of Death Benefit.

(a)Except as otherwise provided in this Section, upon the death of a Participant, the Vested Interest of such Participant shall be distributed by the Trustee at the direction of

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the Committee to such Participant’s beneficiary or beneficiaries determined in accordance with this subsection (a). Any amount payable under the Plan upon the death of a married Participant shall be distributed to the surviving Spouse of such Participant unless such Participant designates otherwise with the written consent of his or her Spouse which is witnessed by a notary public. Any amount payable under the Plan upon the death of a Participant who is not married or who is married but has designated, as provided above, a beneficiary other than his or her Spouse, shall be distributed to the beneficiary or beneficiaries designated by such Participant. Such designation of beneficiary or beneficiaries shall be made in writing on a form prescribed by the Committee and, when filed with or as directed by the Committee, shall become effective and remain in effect until changed by the Participant by the filing of a new beneficiary designation form with the Committee. If an unmarried Participant fails to so designate a beneficiary, or in the event all of a Participant’s designated beneficiaries are individuals who predecease such Participant, then the Committee shall direct the Trustee to distribute the amount payable under the Plan to such Participant’s surviving Spouse, if any, but if none, to such Participant’s estate. All distributions under this subsection (a) shall be made in a single distribution as soon as practicable following a Participant’s death; provided, however, that if the Participant’s Vested Interest exceeds $5,000, he or she may elect (or if the Participant does not elect, his or her designated beneficiary may elect) that distribution be made in monthly, quarterly or annual installments over a period of two or more years with the first such installment to be payable within 90 days after the end of the Plan Year in which the Participant died. Installment payments may be made only to an individual over a period of years not to exceed one or a combination of the following periods: (i) the life of the Participant’s designated beneficiary or (ii) a period certain not extending beyond the life expectancy of the Participant’s designated beneficiary. For purposes of determining whether the value of a Participant’s Vested Interest exceeds $5,000, the value of a Participant’s Vested Interest shall be determined without regard to the value of the Participant’s Rollover Account or Roth Rollover Account.

(b)Any provision of subsection (a) of this Section to the contrary notwithstanding, except as otherwise provided in this subsection (b), upon the death of a married Participant whose Vested Interest exceeds $5,000, such Participant’s Matching Plan Account, Mesa Premium Account, Prior Plan Employer Account and Prior Plan Pre-Tax Account shall be distributed to his or her surviving Spouse in the form of a Qualified Preretirement Survivor Annuity contract to be purchased from a company selected by the Committee and commencing in payment on the date that would have been such Participant’s Normal Retirement Date if he or she were still living. The Committee shall provide each such married Participant with a written explanation of the Qualified Preretirement Survivor Annuity provided above, including the Participant’s right to waive the distribution of such Qualified Preretirement Survivor Annuity with the consent of his or her Spouse and to revoke any such waiver, within whichever of the following periods ends last: • the period beginning with the first day of the Plan Year in which the Participant attains the age of 32 and ending with the close of the Plan Year preceding the Plan Year in which the Participant attains the age of 35, • the one-year period after the individual becomes a Participant, or • the one-year period after separation from employment in the case of a Participant who separates before

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attaining age 35. Each married Participant may elect at any time prior to such Participant’s death to waive the Qualified Preretirement Survivor Annuity form of benefit provided above so that his or her entire benefit may be paid to his or her designated beneficiary. No election to waive the Qualified Preretirement Survivor Annuity will be effective upon the Participant’s death unless such election designates a beneficiary that cannot be changed without spousal consent, the Participant’s surviving Spouse consents in writing to such election and such consent is witnessed by a notary public. A spousal consent will be valid only with respect to the Spouse who signs the consent and such consent shall be irrevocable. A married Participant may revoke any such election to waive the Qualified Preretirement Survivor Annuity at any time prior to his or her death. The amount payable under the Plan upon the death of a married Participant who has elected, as provided above, to waive the Qualified Preretirement Survivor Annuity shall be distributed in accordance with subsection (a) of this Section. The surviving Spouse of any deceased Participant may elect in writing after the Participant’s death to receive the entire benefit otherwise payable to such surviving Spouse in accordance with this subsection (a) of this Section. For purposes of determining whether the value of a Participant’s Vested Interest exceeds $5,000, the value of a Participant’s Vested Interest shall be determined without regard to the value of the Participant’s Rollover Account or Roth Rollover Account.

Section 6.4Distribution of Separation from Employment Benefit.

(g)Except as otherwise provided in this Section, if a Participant separates from the employment of an Employer or Affiliated Company for any reason other than his or her Retirement, Permanent Disability, death or transfer to the employment of another Employer or Affiliated Company, the Accounts of such Participant shall be retained in trust and shall continue to be credited with applicable earnings as provided in Section 4.3, and the Vested Interest of such Participant shall be distributed to him or her by the Trustee at the direction of the Committee in accordance with Section 6.2(a) as soon as practicable after his or her Normal Retirement Date (or, if the Participant dies prior to such date, the Vested Interest of such Participant shall be distributed upon his or her death in accordance with Section 6.3); provided, however, that • each such Participant shall have the right to elect, in the manner prescribed by the Committee, to receive an early distribution of all or a portion of his or her Vested Interest as soon as practicable and • the Committee shall require an early distribution of any such Participant’s Vested Interest which does not exceed $5,000 in the form of a single distribution. The Vested Interest or portion thereof of a Participant who elects to receive an early distribution shall be distributed to him or her in the same manner as provided in Section 6.2(a) for a distribution upon Retirement or Permanent Disability. A Participant who elects to receive an early distribution of less than his or her entire Vested Interest may elect subsequent early distributions with respect to his or her remaining Vested Interest. Any provision of this Plan to the contrary notwithstanding, for purposes of this Article a Participant shall not be treated as having separated from the employment of an Employer or Affiliated Company prior to such time that a distribution can be made to such Participant in accordance with Code Section 401(k) and the regulations thereunder. For purposes of determining whether the value of a Participant’s Vested Interest exceeds $5,000, the value

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of a Participant’s Vested Interest shall be determined without regard to the value of the Participant’s Rollover Account or Roth Rollover Account.

(h)Any provision of subsection (a) of this Section to the contrary notwithstanding, except as otherwise provided in this subsection (b), if a Participant’s whose Vested Interest exceeds $5,000 separates from the employment of an Employer or Affiliated Company for any reason other than his or her Retirement, Permanent Disability, death or transfer to the employment of another Employer or Affiliated Company, such Participant’s Matching Plan Account, Mesa Premium Account, Prior Plan Employer Account and/or Prior Plan Pre-Tax Account shall be distributed to such Participant by the Trustee at the direction of the Committee upon such Participant’s Normal Retirement Date by payment of the entire amount in the form of a Qualified Joint and Survivor Annuity contract to be purchased from a company selected by the Committee and commencing in payment as soon as practicable thereafter (or, if the Participant dies prior to his or her Normal Retirement Date, the Vested Interest of such Participant under the Plan shall be distributed upon his or her death in accordance with Section 6.3); provided, however, that each such Participant shall have the right to elect, in the manner prescribed by the Committee, to receive an early distribution of all or a portion the amount credited to his or her Matching Plan Account, Mesa Premium Account, Prior Plan Employer Account and/or Prior Plan Pre-Tax Account as soon as practicable after such election. If a participant elects under this subsection (b) to receive an early distribution, such distribution shall be made in the form of (i) a Qualified Joint and Survivor Annuity contract to be purchased from a company selected by the Committee and commencing in payment as soon as practicable following such election or (ii) upon satisfaction of the notice and waiver requirements of Section 6.2(b) in accordance with subsection (a) of this Section. A Participant who elects to receive an early distribution of less than the entire balance in his or her Matching Plan Account, Mesa Premium Account, Prior Plan Employer Account and/or Prior Plan Pre-Tax Account may elect subsequent early distributions with respect to such Accounts. For purposes of determining whether the value of a Participant’s Vested Interest exceeds $5,000, the value of a Participant’s Vested Interest shall be determined without regard to the value of the Participant’s Rollover Account or Roth Rollover Account.

(i)Notwithstanding the foregoing provisions of this Section 6.4, no distribution shall be made upon a Participant’s attainment of his or her Normal Retirement Date unless and until such Participant elects to receive such distribution. An election made by a Participant under this Section 6.4(c) to receive a distribution may be made with respect to all or a portion of such Participant’s Vested Interest. A Participant who elects to receive a distribution of less than his or her entire Vested Interest may elect subsequent distributions with respect to his or her remaining Vested Interest.

Section 6.5Forfeitures.

(a)Unless sooner forfeited as provided below, any unvested portion of the Accounts of a Participant who separates from the employment of an Employer or Affiliated Company for any reason other than his or her Retirement, Permanent Disability, death or

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transfer to the employment of another Employer or Affiliated Company shall be forfeited upon the earlier of the date of such Participant’s death or the date such Participant incurs five consecutive One Year Breaks in Service unless such Participant is reemployed by an Employer or Affiliated Company prior to such date.

(b)If a Participant receives a complete distribution of his or her Vested Interest under Section 6.4 by the close of the second Plan Year following the Plan Year in which his or her separation from employment occurred, any portion of such Participant’s Accounts which is not vested at the time of such distribution shall be forfeited at such time. If a Participant who separates from the employment of an Employer or Affiliated Company for any reason other than his or her Retirement, Permanent Disability, death or transfer to the employment of another Employer or Affiliated Company, is not entitled to receive any distribution from the Plan due to the fact that such Participant has no Vested Interest, such Participant shall be deemed to have received a distribution from the Plan of his or her entire Vested Interest under the Plan and any amount credited to such Participant’s Accounts shall be forfeited at the time of such separation from employment. If a Participant, any portion of whose Accounts is forfeited pursuant to this subsection (b), is reemployed as a Covered Employee prior to incurring five consecutive One Year Breaks in Service, the amount so forfeited shall be restored to such individual’s Accounts, out of current-year forfeitures or, if such forfeitures are insufficient, by an additional Employer contribution; provided, however, that no amount shall be restored to the Accounts of an individual who previously received a distribution of the vested portion of such Accounts unless he or she repays to the Plan, while a Covered Employee and within five years of the date of such reemployment, the full amount previously distributed from such Accounts for crediting to his or her Accounts.

(c)If a Participant who has not yet incurred five consecutive One Year Breaks in Service receives a distribution under Section 6.4 after the end of the second Plan Year following the year in which his or her separation from employment occurred, any portion of such Participant’s Accounts which is not vested at the time of such distribution shall be retained in such Account and shall be forfeited upon the earlier of the date of such Participant’s death or the date such Participant incurs five consecutive One Year Breaks in Service unless such Participant is reemployed by an Employer or Affiliated Company prior to such date. If a Participant receives a distribution from the Plan after the end of the second Plan Year following the year in which his or her separation from employment occurred and is reemployed by an Employer or Affiliated Company prior to incurring five consecutive One Year Breaks in Service, then the unvested balance in his or her Accounts shall be transferred to a segregated account for such Participant and the amount that the Participant is entitled to receive from such segregated account as of any later date shall be an amount equal to X, which amount shall be determined in accordance with the following formula: X = P(AB + D) - D, where P is the Participant’s vested percentage at such later date, AB is the amount in his or her segregated account at such later date, and D is the amount distributed to the Participant in connection with his or her earlier separation from employment.

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(d)All amounts forfeited under the Plan shall be credited to a forfeiture account and invested by the Trustee at the direction of the Committee in its discretion until such forfeited amounts and any earnings attributable thereto are applied in accordance with Section 3.8.

Section 6.6In-Service Withdrawals.

(d)A Participant in the employ of an Employer may make

(i)a withdrawal of all or a portion (in any whole percentage or in whole dollar amounts) of the total amount credited to his or her After-Tax Account, Mesa After-Tax Account, Rollover Account, or Roth Rollover Account;

(ii)if the Participant has attained the age of 59½, a withdrawal of all or a portion (in any whole percentage or in whole dollar amounts) of the total vested amount credited to his or her Accounts (other than his or her Matching Plan Account and Mesa Premium Account); or

(iii)a hardship withdrawal of such amount as the Committee shall determine to be necessary to satisfy an immediate and heavy financial need of such Participant from his or her Catch-Up Contribution Account, Pre-Tax Account, Prior Plan Pre-Tax Account, Roth Account, or Roth Catch-Up Contribution Account other than earnings credited to either such Accounts for any period of time after December 31, 1988, and qualified nonelective contributions allocated to either such Accounts.

provided, however, that (i) no withdrawal may be made unless notice of such withdrawal is delivered to or in the manner prescribed by the Committee by the withdrawing Participant within such period of time prior to the effective date thereof as the Committee may prescribe in its discretion, (ii) no withdrawal may be made by a Participant to whom a loan from the Trust is then outstanding unless the Committee is satisfied that such loan will remain nontaxable and fully secured by the withdrawing Participant’s Vested Interest following such withdrawal, and (iii) withdrawals from the Prior Plan Pre-Tax Account and Prior Plan Employer Account may be made only pursuant to the notice and consent requirements of Section 6.2(b). The Committee shall direct the Trustee to distribute any withdrawn amount to such Participant as soon as practicable following the effective date of the withdrawal. Any withdrawal from an Account pursuant to this Section shall be taken proportionally from each Investment Fund in which such Account is invested; provided, however, that a Participant may elect in the manner prescribed by the Committee to have his or her withdrawal taken from the portion of such Account that is invested in one or more Investment Fund(s). The Committee may prescribe uniform and nondiscriminatory rules and procedures limiting the number of times that a Participant may make withdrawals during a Plan Year and the minimum amount that a Participant may withdraw on any single occasion.

(e)A hardship withdrawal will be considered to be made on account of an immediate and heavy financial need of a Participant only if the Committee determines that such withdrawal is on account of • expenses for (or necessary to obtain) medical care that

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would be deductible under Code Section 213(d) (determined without regard to whether the expenses exceed 7.5% of adjusted gross income), • costs directly related to the purchase of a principal residence for such Participant (excluding mortgage payments), • payment of tuition and related educational fees for the next 12 months of post-secondary education for such Participant or his or her Spouse, children or dependents (within the meaning of Code Section 152 without regard to Code Sections 152(b)(l), (b)(2), and (d)(l)(B)), • payments necessary to prevent the eviction of such Participant from his or her principal residence or foreclosure on the mortgage of such residence, • payments for burial or funeral expenses for the Participant’s deceased parent, Spouse, children or dependents (as defined in Code Section 152 without regard to Code Section 152(d)(l)(B)), or • expenses for the repair of damage to the Participant’s principal residence mat would qualify for the casualty deduction under Code Section 165 (determined without regard to whether the loss exceeds 10% of adjusted gross income).

(f)A hardship withdrawal will be considered to be necessary to satisfy an immediate and heavy financial need of a Participant only if the Committee determines that • the amount of such withdrawal is not in excess of the amount of such need plus any amounts necessary to pay any federal, state or local income taxes or penalties reasonably anticipated to result from the withdrawal, and • such Participant has obtained all distributions and withdrawals, other than hardship withdrawals, and all nontaxable loans currently available under all plans maintained by the Employers.

(g)Any provision of this Plan to the contrary notwithstanding, if a Participant makes a hardship withdrawal, no contributions shall be made to this Plan on behalf of such Participant for 6 months after receipt of such withdrawal and no contributions shall be made by or on behalf of such Participant to any other deferred compensation plan maintained by an Employer or Affiliated Company for 6 months after receipt of such withdrawal. At the end of the 6 months, a Participant’s contributions will resume automatically unless the Participant elects otherwise.

(h)HEART Act Withdrawal. Effective for payments made pursuant to the Employer’s military differential wage payment program and distributions taken on or after January 1, 2009, a Participant who is receiving military differential wage payments will be treated as having severed from employment during any period during which the individual is performing service in the uniformed services as described in Code Section 414(u). The Participant is entitled to take a distribution from his Pre-Tax Account and Roth Account while on qualified military leave for more than 30 days. The HEART Act withdrawal will be subject to the 10% early withdrawal penalty, and the Participant will be suspended from making Pre-Tax Contributions and Roth Contributions for 6 months. Further, the Participant cannot repay the HEART Act Withdrawal to the Plan.

(i)Qualified Military Reservist Distribution. Effective September 11, 2001, a Participant who is a reservist or national guardsman (as defined by 37 U.S.C. 101(24)) called to active duty for a period in excess of 179 days or for an indefinite time after September 11, 2001 may elect to withdraw all or a portion of his Pre-Tax Contribution Account as a

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qualified reservist withdrawal. Any such qualified reservist withdrawal will not be subject to the 10% early withdrawal penalty. Further, a Participant who receives a qualified reservist distribution from the Plan may repay to an individual retirement plan of such Participant (in one or more contributions) the amount of the distribution at any time during the two-year period after the end of the active duty period.

Section 6.7Distributions to Minors and Persons Under Legal Disability. If any distribution under the Plan becomes payable to a minor or other person under a legal disability, such distribution may be made to the duly appointed guardian or other legal representative of the estate of such minor or person under legal disability.

Section 6.8Unclaimed or Uncashed Benefits. If a Participant or beneficiary is entitled to a benefit under the Plan, the Participant or beneficiary is responsible for providing the Committee with his current address. If the Committee cannot ascertain the whereabouts of any person to whom a benefit distribution is due under the Plan (either if a benefit distribution is pending or if a benefit distribution has been made but the distribution check remains uncashed or is returned undelivered), the Committee will mail a notice regarding such distribution to the last known address of such person as shown on the records of the Committee of Employer for a pending benefit distribution or if the distribution check remains uncashed or will re-send the check to a forwarding address or conduct an address search and re-send the check where the check is returned undelivered. If such person has not made written claim or cashed the distribution check within a reasonable period after the check void date or notification of a pending benefit distribution as applicable, the Committee may direct that such distribution otherwise due such person be forfeited and the amount used to offset Plan expenses or applied to reduce the contributions of the Employer. Upon the forfeiture of such unclaimed or uncashed benefit distribution, the Plan will have no further liability except that, in the event such Participant or beneficiary later notifies the Committee of his whereabouts and requests the distribution due to him under the Plan, the amount so forfeited will be paid to him in accordance with the provisions of the Plan pursuant to Treasury Regulation 1.411(a)-4(b)(6) (regarding forfeiture and reinstatement of benefits for lost participants).

Section 6.9Plan Loans.

(a)Subject to such conditions and limitations as the Committee may from time to time prescribe for application to all Participants and beneficiaries on a uniform basis, at the request of a Participant or beneficiary of a deceased Participant who is a party in interest (within the meaning of Section 3(14) of the Employee Retirement Income Security Act of 1974, as amended) with respect to the Plan (hereinafter called the “Borrower”), the Committee shall direct the Trustee to loan to such Borrower from his or her Accounts (other than the Borrower’s Matching Plan Account and Mesa Premium Account) an amount of money which, when added to the total outstanding balance of all other loans to such Borrower from the Plan or from a qualified employer plan (within the meaning of Code Section 72(p)) maintained by an Employer or Affiliated Company, does not exceed the lesser of • $50,000 (reduced, however, by the excess, if any, of the highest total outstanding balance of all such other loans during the one-year period ending on the day before the date such loan is made, over the outstanding balance of all such other loans on the date such loan is

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made), or • one-half of such Participant’s Vested Interest under the Plan (or, in the case of a loan to a beneficiary, one-half of such beneficiary’s Accounts).

(b)Any such loan made to a Borrower shall be evidenced by a promissory note or other evidence of indebtedness payable to the Trustee, shall bear a reasonable rate of interest, shall be secured by one-half of the Participant’s vested interest under the Plan (or, in the case of a loan to a beneficiary, by one-half of such beneficiary’s Accounts), shall be repayable in substantially equal payments no less frequently than quarterly and shall be repayable within five years or, in the case of a loan that is to be used to acquire any dwelling unit which within a reasonable period of time is to be used as the principal residence of the Participant, within such period greater than five years as shall be determined by the Committee or its delegate in its absolute discretion.

(c)Any provision of this Plan to the contrary notwithstanding, • the promissory note or other evidence of indebtedness evidencing any such loan shall be held by the Trustee as a segregated investment allocated to and made solely for the benefit of the Account of the Borrower from which such loan was made, and • no loan shall be made to a married Participant from a Prior Plan Pre-Tax Account or Prior Plan Employer Account unless the Spouse of such Participant consents in writing thereto within the 180-day period preceding the date such loan is made and such consent is witnessed by a notary public.

(d)Plan loans to directors and executive officers of an Employer may be denied in the event that the Committee determines that loans may not be made to such persons under the Sarbanes-Oxley Act of 2002 or other federal law.

Section 6.10Qualified Domestic Relations Orders. Any provision of this Plan to the contrary notwithstanding:

(a)The Committee shall establish and maintain for each alternate payee named with respect to a Participant under a domestic relations order which is determined by the Committee to be a qualified domestic relations order (as defined in Code Section 414(p)) such separate Accounts as the Committee may deem to be necessary or appropriate to reflect such alternate payee’s interest in the Accounts of such Participant. Such alternate payee’s Accounts shall be credited with the alternate payee’s interest in the Participant’s Accounts as determined under such qualified domestic relations order. The alternate payee may change investment direction with respect to his or her Account balances in accordance with Section 4.2 in the same manner as the Participant.

(b)Except to the extent otherwise provided in the qualified domestic relations order naming an alternate payee with respect to a Participant, • the alternate payee may designate a beneficiary on a form prescribed by and filed with or as directed by the Committee, • if no such beneficiary is validly designated or if the designated beneficiary is a person who predeceases the alternate payee, the beneficiary of the alternate payee shall be the alternate payee’s estate, and • the beneficiary of the alternate payee shall be accorded under the Plan all of the rights and privileges of the beneficiary of a Participant.

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(c)An alternate payee named with respect to a Participant shall be entitled to receive a distribution from the Plan in accordance with the qualified domestic relations order naming such alternate payee. Such distribution may be made only in a form provided under the Plan and shall include only such amounts as are vested. If a qualified domestic relations order so provides, a lump sum distribution of the total vested amount credited to the alternate payee’s Accounts may be made to the alternate payee at any time prior to the date the Participant named in such qualified domestic relations order attains his or her earliest retirement age (as defined in Section Code 414(p)(4)(B)). To the extent provided by a qualified domestic relations order, the alternate payee named with respect to a Participant may make withdrawals (other than hardship withdrawals) from his or her Accounts in accordance with Article VI in the same manner as the Participant with respect to whom such alternate payee was named under said qualified domestic relations order.

(d)If a portion of any unvested amount credited to the Employer Account or Matching Plan Account of a Participant named in the qualified domestic relations order is credited to the Employer Account or Matching Plan Account, whichever is applicable, of the alternate payee named in such qualified domestic relations order, the portion credited to the alternate payee’s Employer Account or Matching Plan Account shall vest and/or be forfeited at the same time and in the same manner as the Participant’s Employer Account or Matching Plan Account, whichever is applicable.

Section 6.11Transfer of Eligible Rollover Distribution.

(a)If a Participant is entitled to receive an eligible rollover distribution (as defined in Code Section 402(c) and the regulations thereunder, which exclude, among other distributions, any hardship distribution described in Code Section 401(k)(2)(B)(i)(IV)) from the Plan, such Participant may elect to have the Committee direct the Trustee to transfer the entire amount of such distribution directly to any of the following specified by such Participant: an individual retirement account described in Code Section 408(a), an individual retirement annuity described in Code Section 408(b) (other than an endowment contract), a defined contribution plan qualified under Code Section 401(a) the terms of which permit rollover contributions or an annuity plan described in Code Section 403(a); provided, however, than an amount credited to a Roth Account may be transferred only to a designated Roth account or Roth IRA described in Code Section 402A.

(b)If the surviving Spouse of a deceased Participant is entitled to receive an eligible rollover distribution from the Plan, such surviving Spouse may elect to have the Committee direct the Trustee to transfer the entire amount of such distribution directly to either an individual retirement account described in Code Section 408(a) or an individual retirement annuity described in Code Section 408(b) (other than an endowment contract) specified by such surviving Spouse.

(c)If a designated beneficiary of a deceased Participant other than the Participant’s surviving Spouse is entitled to receive a distribution under this Plan, and the distribution would be an eligible rollover distribution as defined in Code Section 402(c) except for the requirement that the distribution be made to the Participant’s Spouse, the

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designated beneficiary may request to have any portion of the distribution made to an eligible individual retirement plan, as defined in Code Section 402(c)(8)(b)(i) or (ii), that has been established for the purpose of receiving the distribution on behalf of the designated beneficiary. The Committee will direct the Trustee to make distributions under this subsection only if the Committee determines that the requested distribution satisfies the requirements of Code Section 402(c)(11) and any regulations or other guidance issued under that Section.

(d)If an alternate payee under a qualified domestic relations order (as defined in Code Section 414(p)) is the Spouse or former Spouse of the Participant specified in the qualified domestic relations order, this Section shall apply to such alternate payee as if the alternate payee were a Participant.

(e)A distributee of an eligible rollover distribution who is entitled to make an election under this Section may specify that some portion less than the entire amount of such distribution be transferred in accordance with this Section.

(f)The preceding provisions of this Section to the contrary notwithstanding:

(i)an “eligible retirement plan” shall also mean an annuity contract described in Code Section 403(b) or an eligible plan under Code Section 457(b) which is maintained by a state, political subdivision of a state, or any agency or instrumentality of a state or political subdivision of a state which agrees to separately account for amounts transferred into such plan from this Plan, and an individual retirement plan described in Code Section 408A (for taxable years beginning before January 1, 2010, rollover to an individual retirement plan described in Code Section 408A is not allowed where an individual has modified adjusted gross income exceeding $100,000 or is married and files a separate return);

(ii)the definition of “eligible retirement plan” shall also apply in the case of a distribution to a surviving Spouse, or to a Spouse or former Spouse who is the alternate payee under a qualified domestic relations order, as defined in Code Section 414(p);

(iii)any amount that is distributed on account of hardship shall not be an eligible rollover distribution and the distributee may not elect to have any portion of such a distribution paid directly to an eligible retirement plan; and

(iv)a portion of a distribution shall not fail to be an eligible rollover distribution merely because the portion consists of after-tax employee contributions which are not includible in gross income, provided that such portion may be transferred only to an individual retirement account or annuity described in Code Section 408(a) or (b), or to a qualified defined contribution plan described in Code Section 401(a) or 403(a) or a qualified defined benefit plan described in Code Section 401(a) that agrees to separately account for amounts so transferred, including

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separately accounting for the portion of such distribution which is includible in gross income and the portion of such distribution which is not so includible.

Section 6.12Automatic Rollovers. If a single distribution exceeding $1,000 is required to be made to a Participant pursuant to Section 6.2(a) or 6.4(a) prior to the Participant’s attainment of age 65, and if the Participant does not elect either to receive the distribution directly or to have the distribution transferred in a direct rollover pursuant to Section 6.11 to an eligible retirement plan specified by the Participant, the Committee shall direct the distribution to be transferred in a direct rollover to an individual retirement plan designated by the Committee. For purposes of determining whether a distribution will exceed $1,000, a Participant’s Roth Account together with his or her Roth Catch-Up Contribution Account and the Participant’s other Accounts are treated as held under two separate plans.

Section 6.13Distribution on Normal Retirement Date and Retirement. Notwithstanding the provisions of Sections 6.1(a), 6.2(a), 6.2(b), 6.4(a) and 6.4(b) of the Plan (and the corresponding sections of the Plan in effect prior to January 1, 2008), a Participant shall not be required to receive a distribution of his or her Vested Interest under the Plan upon reaching his or her Normal Retirement Date or as a result of his or her Retirement prior to attaining age 70½ if such Participant’s Vested Interest exceeds $5,000. Rather, the Participant’s Vested Interest will be retained in trust and shall not commence being distributed until the earlier of the April 1 of the calendar year following the calendar year in which the Participant reaches age 70½ or such time as the Participant elects for his or her Vested Interest to be distributed. The distribution of a Participant’s Vested Interest in accordance with this Section 6.13 shall be made to him or her in the same manner as provided in Section 6.2(a) or 6.2(b), as applicable. Notwithstanding any provision of this Section 6.13 to the contrary, the distribution of a Participant’s Vested Interest must be made in a manner that satisfies the requirements of Code Section 401(a)(9).

Section 6.14In-Plan Roth Rollovers.

(a)Effective for distributions made on or after July 1, 2013, a Participant may elect to roll over a distribution to an In-Plan Roth Rollover Contribution Account in accordance with the provisions of this Section 6.14. In-Plan Roth Rollover Contributions shall be subject to the same Plan rules as Roth Contributions, Roth Bonus Contributions, Roth Catch-Up Contributions and Roth Bonus Catch-Up Contributions. The Plan Administrator will maintain such records as are necessary for the proper reporting of In-Plan Roth Rollover Contributions and will administer the In-Plan Roth Rollover Contribution Account in accordance with Code Section 402A and the regulations promulgated thereunder.

(b)The following contributions are permitted for roll over to the In-Plan Roth Rollover Contribution Account: (i) After-Tax Account, (ii) Catch-up Contribution Account, (iii) Employer Account, (iv) Matching Plan Account, (v) Mesa After-Tax Account, (vi) Mesa Premium Account, (vii) Mesa Profit-Sharing Account, (viii) Pre-Tax Account, (ix) Prior Plan Employer Account, (x) Prior Plan Pre-Tax Account, and (xi) Rollover Account.

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(c)Solely for the purposes of determining eligibility for an In-Plan Roth Rollover Contribution, the Plan will treat a Participant’s surviving Spouse, former Spouse or alternate payee Spouse as a Participant. A non-spouse beneficiary may not make an In-Plan Roth Rollover Contribution to the Plan.

(d)An In-Plan Roth Rollover Contribution must be made by the Participant in the form of a direct rollover. An In-Plan Roth Rollover Contribution may not include any Plan loans.

(e)The distribution provisions in Section 6.6 will apply to In-Plan Roth Rollover Contributions.

(f)Notwithstanding any other provision of the Plan to the contrary, an In-Plan Roth Rollover Contribution is not a Rollover or Roth Rollover Contribution for purposes of the Plan. An In-Plan Roth Rollover Contribution will not be treated as a distribution for purposes of sections 401(a)(11), 411(a)(11), or 411(d)(6)(B)(ii) of the Code. Amounts in a Participant’s In-Plan Roth Rollover Contribution Account may only be withdrawn by a Participant when the Participant is eligible for a distribution from the Plan under Article VI.

ARTICLE VIIPLAN ADMINISTRATION

Section 7.1401(k) and Matching Plan Committee. The plan administrator of the Plan shall be a 401(k) and Matching Plan Committee composed of at least three individuals appointed by the Board of Directors of the Company. Each member of the Committee so appointed shall serve in such office until his or her death, resignation or removal by the Board of Directors of the Company. The Board of Directors of the Company may remove any member of the Committee at any time by giving written notice thereof to the members of the Committee. Vacancies shall likewise be filled from time to time by the Board of Directors of the Company. The members of the Committee shall receive no remuneration from the Plan for their services as Committee members.

Section 7.2Powers, Duties and Liabilities of the Committee. The Committee shall have discretionary and final authority to interpret and implement the provisions of the Plan, including without limitation authority to determine eligibility for benefits under the Plan, and shall perform all of the duties and exercise all of the powers and discretion granted to it under the terms of the Plan. The Committee shall act by a majority of its members at the time in office and such action may be taken either by a vote at a meeting or in writing without a meeting. The Committee may by such majority action authorize any one or more of its members to execute any document or documents on behalf of the Committee, in which event the Committee shall notify the Trustee in writing of such action and the name or names of its member or members so authorized to act Every interpretation, choice, determination or other exercise by the Committee of any discretion given either expressly or by implication to it shall be conclusive and binding upon all parties directly or indirectly affected, without restriction, however, on the right of the Committee to reconsider and redetermine such actions. In performing any duty or exercising any power herein conferred, the Committee shall in no event perform such duty or exercise such power in any manner which

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discriminates in favor of Highly Compensated Employees. The Employers shall indemnify and hold harmless each member of the Committee against any claim, cost, expense (including attorneys’ fees), judgment or liability (including any sum paid in settlement of a claim with the approval of the Employers) arising out of any act or omission to act as a member of the Committee appointed under this Plan, except in the case of willful misconduct.

Section 7.3Rules, Records and Reports. The Committee may adopt such rules and procedures for the administration of the Plan as are consistent with the terms hereof, and shall keep adequate records of the Committee’s proceedings and acts and of the status of the Participants’ Accounts. The Committee may employ such agents, accountants and legal counsel (who may be agents, accountants or legal counsel for an Employer) as may be appropriate for the administration of the Plan. The Committee shall at least annually provide each Participant with a report reflecting the status of his or her Accounts in the Trust and shall cause such other information, documents or reports to be prepared, provided and/or filed as may be necessary to comply with the provisions of the Employee Retirement Income Security Act of 1974 or any other law.

Section 7.4Administration Expenses and Taxes. Unless otherwise paid by the Employers in their absolute discretion, the Committee shall direct the Trustee to pay all reasonable and necessary expenses (including the fees of agents, accountants and legal counsel) incurred by the Committee in connection with the administration of the Plan. Should any tax of any character (including transfer taxes) be levied upon the Trust assets or the income therefrom, such tax shall be paid from and charged against the assets of the Trust.

ARTICLE VIIIAMENDMENT AND TERMINATION

Section 8.1Amendment. The Board of Directors of the Company shall have the right and power at any time and from time to time to amend this Plan, in whole or in part, on behalf of all Employers. Any such amendment made by the Board of Directors of the Company shall be made by or pursuant to a resolution duly adopted by the Board of Directors of the Company, and shall be evidenced by such resolution or by a written instrument executed by such person as the Board of Directors of the Company shall authorize for such purpose. With the consent of the Board of Directors of the Company and subject to such procedure as it may prescribe, the Board of Directors of each Employer shall have the right and power at any time and from time to time to amend this Plan, in whole or in part, with respect to the Plan’s application to the Participants of the particular amending Employer and the assets held in the Trust for their benefit, or to transfer such assets or any portion thereof to a new trust for the benefit of such Participants. However, in no event shall any amendment or new trust permit any portion of the trust fund to be used for or diverted to any purpose other than the exclusive benefit of the Participants and their beneficiaries, nor shall any amendment or new trust reduce a Participant’s Vested Interest under the Plan.

Section 8.2Termination. The Board of Directors of the Company shall have the right and power at any time to terminate this Plan on behalf of all Employers, or to terminate this Plan as it applies to the Participants who are or were employees of any particular Employer, by giving written notice of such termination to the Committee and Trustee. Any provision of this Plan to the

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contrary notwithstanding, upon the termination or partial termination of the Plan as to any Employer, or in the event any Employer should completely discontinue making contributions to the Plan without formally terminating it, all amounts credited to the Accounts of the affected Participants of that particular Employer shall be fully vested.

Section 8.3Benefit Plan Design Committee. Any action permitted to be taken by the Board with respect to the amendment of this Plan may be taken by the Benefit Plan Design Committee. The Benefit Plan Design Committee shall be composed of at least two individuals appointed by the Board of Directors of the Company. Each member of the Benefit Plan Design Committee so appointed shall serve in such office until his or her death, resignation or removal by the Board. The Board may remove any member of the Benefit Plan Design Committee at any time by giving written notice thereof to the members of the Benefit Plan Design Committee. Vacancies shall likewise be filled from time to time by the Board. The Benefit Plan Design Committee shall act by a majority of its members at the time in office and such action may be taken either by a vote at a meeting or in writing without a meeting.

ARTICLE IXTOP-HEAVY PROVISIONS

Section 9.1Top-Heavy Definitions. Unless the context clearly indicates otherwise, when used in this Article:

(j)“Top-Heavy Plan” means this Plan if, as of the Determination Date, the aggregate of the Accounts of Key Employees under the Plan exceeds 60% of the aggregate of the Accounts of all Participants and former Participants under the Plan. The aggregate of the Accounts of any Participant or former Participant shall include any distributions (other than related rollovers or transfers from the Plan within the meaning of regulations under Code Section 416(g)) made from such individual’s Accounts during the one-year period ending on the Determination Date, but shall not include any unrelated rollovers or transfers (within the meaning of regulations under Code Section 416(g)) made to such individual’s Accounts after December 31, 1983; provided, however, that in the case of a distribution made for a reason other than severance from employment, death, or disability, this provision shall be applied by substituting “five-year period” for “one-year period.” The Account of any Participant or former Participant who • is not a Key Employee for the Plan Year in question but who was a Key Employee in a prior Plan Year, or • has not completed an Hour of Service during the one-year period ending on the Determination Date, shall not be taken into account. The determination of whether the Plan is a Top-Heavy Plan shall be made after aggregating all other plans of an Employer and any Affiliated Company qualifying under Code Section 401(a) in which a Key Employee is a participant or which enables such a plan to meet the requirements of Code Section 401(a)(4) or 410, and after aggregating any other plan of an Employer or Affiliated Company, which is not already aggregated, if such aggregation group would continue to meet the requirements of Code Sections 401(a)(4) and 410 and if such permissive aggregation thereby eliminates the top-heavy status of any plan within such permissive aggregation group. For purposes of determining the aggregate of the Accounts of any Participant or former Participant, the distributions included, as provided

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above, shall include distributions under a terminated plan which, had it not been terminated, would have been aggregated with the Plan under Code Section 416(g)(2)(A)(i). The determination of whether this Plan is a Top-Heavy Plan shall be made in accordance with Code Section 416(g).

(k)“Determination Date” means, for purposes of determining whether the Plan is a Top-Heavy Plan for a particular Plan Year, the last day of the preceding Plan Year.

(l)“Key Employee” means any Employee or former Employee (including a beneficiary of such Employee or former Employee) who at any time during the Plan Year that includes the Determination Date is:

(i)an officer of an Employer having Compensation for such Plan Year greater than $130,000 (as adjusted under Code Section 416(i)(l) for Plan Years beginning after December 31, 2002);

(ii)a 5% owner of the Employer; or

(iii)a 1% owner of the Employer having Compensation for such Plan Year of more than $150,000.

The determination of who is a Key Employee will be made in accordance with Code Section 416(i)(l) and the applicable regulations and other guidance of general applicability issued thereunder.

(m)“Non-Key Employee” means any Employee or former Employee (including a beneficiary of such Employee or former Employee) who is not a Key Employee.

Section 9.2Minimum Contribution Requirement. Any provision of this Plan to the contrary notwithstanding, if the Plan is a Top-Heavy Plan for any Plan Year, then the Employers will contribute to the Employer Account of each Non-Key Employee who is both eligible to participate and in the employ of an Employer on the last day of such Plan Year, an amount which, when added to the total amount of Matching Contributions and forfeitures otherwise allocable under the Plan to such Non-Key Employee for such year, shall equal the lesser of (i) 3% of such Non-Key Employee’s Compensation for such year or (ii) the amount of contributions (including Total Tax-Advantaged Contributions) and forfeitures (expressed as a percentage of Compensation) allocable under the Plan for or on behalf of the Key Employee for whom such percentage is the highest for the Plan Year after taking into account contributions under other defined contribution plans maintained by the Employer in which a Key Employee is a participant (as well as any other plan of an Employer which enables such a plan to meet the requirements of Code Section 401(a)(4) or 410); provided, however, that no minimum contribution shall be made for a Non-Key Employee under tin’s Section for any Plan Year if the Employer maintains another qualified plan under which a minimum benefit or contribution is being accrued or made for such Plan Year for the Non-Key Employee in accordance with Code Section 416(c). A Non-Key Employee who is not a Participant, but for whom a contribution is made pursuant to this Section, shall be accorded all of the rights and privileges of a Participant under the Plan except that no contributions (other

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than contributions pursuant to this Section) shall be made for or on behalf of such Non-Key Employee until he or she meets the eligibility and participation requirements of Article II.

Section 9.3Minimum Vesting Schedule. Any provision of this Plan to the contrary notwithstanding, if the Plan is a Top-Heavy Plan for any Plan Year, then effective as of the first day of such Plan Year with respect to Participants who complete an Hour of Service on or after such day, the vesting schedule provided in Section 5.2 shall be applied to that portion of such Participants’ Employer Account which is attributable to any amounts credited to his or her Employer Nonelective Contribution Account under the Superseded Plan as in effect on September 30,1997, as if to read as follows:

Period of Service Completed by Participant	Percentage Vested
Less than 3 years	None
3 or more years	100%

ARTICLE X
MISCELLANEOUS GENERAL PROVISIONS

Section 10.1Spendthrift Provision. No right or interest of any Participant or beneficiary under the Plan may be assigned, transferred or alienated, in whole or in part, either directly or by operation of law, and no such right or interest shall be liable for or subject to any debt, obligation or liability of such Participant or beneficiary; provided, however, that nothing herein shall prevent the payment of amounts from a Participant’s Accounts under the Plan in accordance with the terms of a court order which the Committee has determined to be a qualified domestic relations order (as defined in Code Section 414(p)).

Section 10.2Claims Procedure. If any person (hereinafter called the “Claimant”) feels that he or she is being denied a benefit to which he or she is entitled under the Plan, such Claimant may file a written claim for said benefit with any member of the Committee. Within 60 days of the receipt of such claim the Committee shall determine and notify the Claimant as to whether he or she is entitled to such benefit. Such notification shall be in writing and, if denying the claim for benefit, shall set forth the specific reason or reasons for the denial, make specific reference to the pertinent provisions of the Plan, and advise the Claimant that he or she may, within 60 days of the receipt of such notice, in writing request to appear before the Committee for a hearing to review such denial. Any such hearing shall be scheduled at the mutual convenience of the Committee or its designated representative and the Claimant, and at such hearing the Claimant and/or his or her duly authorized representative may examine any relevant documents and present evidence and arguments to support the granting of the benefit being claimed. The final decision of the Committee with respect to the claim being reviewed shall be made within 60 days following the hearing thereon and the Committee shall in writing notify the Claimant of its final decision, again specifying the reasons therefore and the pertinent provisions of the Plan upon which such decision is based. The final decision of the Committee shall be conclusive and binding upon all parties having or claiming to have an interest in the matter being reviewed.

46

Section 10.3Maximum Contribution Limitation. Any provision of this Plan to the contrary notwithstanding (except to the extent permitted under Section 3.3 of the Plan and Code Section 414(v), if applicable), the sum of (i) the Employer contributions, (ii) the forfeitures, and (iii) the Participant contributions (excluding rollover contributions and employee contributions to a simplified employee pension allowable as a deduction, each within the meaning specified in Code Section 415(c)(2)) (collectively “Maximum Annual Additions”), allocated to a Participant with respect to a Plan Year shall in no event exceed the lesser of $40,000 (as adjusted for increases in the cost-of-living under Code Section 415(d)) or 100% of such Participant’s Compensation for that year. For the purposes of applying the limitation imposed by this Section, each Employer and its Affiliated Companies shall be considered a single employer, and all defined contribution plans (meaning plans providing for individual accounts and for benefits based solely upon the amounts contributed to such accounts and any forfeitures, income, expenses, gains and losses allocated to such accounts) described in Code Section 415(c)(2), whether or not terminated, maintained by an Employer or its Affiliated Companies shall be considered a single plan. Notwithstanding any provision of the Plan to the contrary, if the Maximum Annual Additions are exceeded for any Participant, then the Plan may only correct such excess in accordance with the Employee Plans Compliance Resolutions System (“EPCRS”) as set forth in Revenue Procedure 2008-50 or any superseding guidance, including, but not limited to, the preamble of the final section 415 regulations.

Section 10.4Employment Noncontractual. The establishment of this Plan shall not enlarge or otherwise affect the terms of any Employee’s employment with an Employer and an Employer may terminate the employment of any Employee as freely and with the same effect as if this Plan had not been adopted.

Section 10.5Limitations on Responsibility. The Employers do not guarantee or indemnify the Trust against any loss or depreciation of its assets which may occur, nor guarantee the payment of any amount which may become payable to a Participant or his or her beneficiaries pursuant to the provisions of this Plan. All payments to Participants and their beneficiaries shall be made by the Trustee at the direction of the Committee solely from the assets of the Trust and the Employers shall have no legal obligation, responsibility or liability for any such payments.

Section 10.6Merger or Consolidation. In no event shall this Plan be merged or consolidated into or with any other plan, nor shall any of its assets or liabilities be transferred to any other plan, unless each Participant would be entitled to receive a benefit if the plan in which he or she then participates terminated immediately following such merger, consolidation or transfer, which is equal to or greater than the benefit he or she would have been entitled to receive if the Plan had been terminated immediately prior to such merger, consolidation or transfer.

Section 10.7Applicable Law. This Plan shall be governed and construed in accordance with the internal laws (and not the principles relating to conflicts of laws) of the State of Texas except where superseded by federal law.

Section 10.8USERRA Compliance. Notwithstanding any provision of this Plan to the contrary, contributions, benefits and service credit with respect to qualified military service will be provided in accordance with Code Section 414(u).

47

IN WITNESS WHEREOF, this restatement has been executed as of this 18th day of December, 2013, to be effective as of January 1, 2013.

	PIONEER NATURAL RESOURCES USA, INC.
By:	/s/ Larry N. Paulsen
	Larry N. Paulsen, Vice President,
	Administration and Risk Management

2171486v.4

48

EX-12.1

EXHIBIT 12.1

RATIOS OF EARNINGS TO FIXED CHARGES AND EARNINGS TO FIXED CHARGES AND PREFERRED STOCK DIVIDENDS

The following table sets forth the Company's ratios of consolidated earnings to fixed charges and earnings to fixed charges and preferred stock dividends for the periods presented:

	Year ended December 31,
	2013	2012	2011	2010	2009
Ratio of earnings to fixed charges (a)	(b)	4.55	3.70	4.79	(c)
Ratio of earnings to fixed charges and preferred stock (d)	(b)	4.55	3.70	4.79	(c)

____________________

(a)	The ratio has been computed by dividing earnings by fixed charges. For purposes of computing the ratio:
	- earnings consist of income from continuing operations before income taxes, cumulative effect of change in accounting principle, adjustments for net income or loss attributable to the noncontrolling interest and the Company's share of investee's income or loss accounted for under the equity method, and adjustment for capitalized interest, plus fixed charges and the Company's share of distributed income from investees accounted for under the equity method; and
	- fixed charges consist of interest expense, capitalized interest and the portion of rental expense deemed to be representative of the interest component of rental expense.
(b)	The ratio indicates a less than one-to-one coverage because the earnings are inadequate to cover the fixed charges during the year ended December 31, 2013 by $592.7 million.
(c)	The ratio indicates a less than one-to-one coverage because the earnings are inadequate to cover the fixed charges during the year ended December 31, 2009 by $297.6 million.
(d)	The ratio has been computed by dividing earnings by fixed charges and preferred stock dividends. For purposes of computing the ratio:
	- earnings consist of income from continuing operations before income taxes, cumulative effect of change in accounting principle, adjustments for net income or loss attributable to the noncontrolling interest and the Company's share of investee's income or loss accounted for under the equity method, and adjustment for capitalized interest, plus fixed charges, the Company's share of distributed income from investees accounted for under the equity method and preferred stock dividends, net of preferred stock dividends of a consolidated subsidiary; and
	- fixed charges and preferred stock dividends consist of interest expense, capitalized interest and the portion of rental expense deemed to be representative of the interest component of rental expense, preferred stock dividends of a consolidated subsidiary and preferred stock dividends.

EX-21.1

EXHIBIT 21.1

SUBSIDIARIES OF THE COMPANY

Subsidiaries	State or Jurisdiction of Organization
Pioneer Natural Resources USA, Inc.	Delaware
DMLP CO.	Delaware
Long Canyon Gas Company, LLC	Colorado
Lorencito Gas Gathering, LLC	Colorado
Mesa Environmental Ventures Co.	Delaware
Petroleum South Cape (Pty) Ltd.	South Africa
Pioneer Natural Gas Company	Texas
Pioneer Natural Resources Alaska, Inc.	Delaware
Pioneer Natural Resources Foundation	Texas
Pioneer Natural Resources Midstream Holding LLC	Delaware
Pioneer Natural Resources Pumping Services LLC	Delaware
Industrial Sands Holding Company	Delaware
Premier Silica LLC	California
Pioneer Natural Resources South Africa (Pty) Limited	South Africa
Pioneer Natural Resources (Tierra del Fuego) S.R.L.	Argentina
Pioneer Natural Resources UK Limited	England
Pioneer Natural Resources Well Services LLC	Delaware
Pioneer Natural Resources West Africa Limited	Cayman Islands
Pioneer Natural Resources Equatorial Guinea Limited	Cayman Islands
Pioneer Resources Africa Limited	Cayman Islands
Pioneer Natural Resources Nigeria Ltd.	Cayman Islands
Pioneer NR Nigeria (256) Limited	Nigeria
Pioneer Resources Gabon Limited	Bahamas
Pioneer Uravan, Inc.	Texas
Pioneer Water Management LLC	Delaware
PNR Acquisitions LLC	Delaware
Sendero Holding Company, LLC	Delaware
Sendero Drilling Company, LLC	Delaware
Westpan Limited NGL LLC	Texas
Westpan Limited Resources LLC	Texas
Pioneer International Resources Company	Delaware
LF Holding Company LDC	Cayman Islands
Parker & Parsley Argentina, Inc.	Delaware
TDF Holding Company LDC	Cayman Islands
Parker & Parsley 87-A Conv., Ltd.	Texas
Parker & Parsley 90 Spraberry Private Development, L.P.	Delaware
Parker & Parsley Private Investment 88 L.P.	Delaware
Parker & Parsley Private Investment 89, L.P.	Delaware
Midkiff Development Drilling Program, Ltd.	Texas

Note:Inclusion in the list is not a representation that the subsidiary is a significant subsidiary.

EX-23.1

EXHIBIT 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in the following Registration Statements:

(1) Registration Statement (Form S-3 No. 333-174402) of Pioneer Natural Resources Company and Pioneer Natural Resources USA, Inc. and in the related Prospectus,

(2) Registration Statement (Form S-8 No. 333-136488) pertaining to the Pioneer Natural Resources Company Executive Deferred Compensation Plan,

(3) Registration Statement (Form S-8 No. 333-136489) pertaining to the Pioneer Natural Resources Company 2006 Long-Term Incentive Plan,

(4) Registration Statement (Form S-8 No. 333-136490) pertaining to the Pioneer Natural Resources Company Long-Term Incentive Plan,

(5) Registration Statement (Form S-8 No. 333-88438) pertaining to the Pioneer Natural Resources Company Long-Term Incentive Plan,

(6) Registration Statement (Form S-8 No. 333-39153) pertaining to the Pioneer Natural Resources Company Deferred Compensation Retirement Plan,

(7) Registration Statement (Form S-8 No. 333-39249) pertaining to the Pioneer Natural Resources USA, Inc. Profit Sharing 401(k) Plan,

(8) Registration Statement (Form S-8 No. 333-35087) pertaining to the Pioneer Natural Resources Company Long-Term Incentive Plan,

(9) Registration Statement (Form S-8 No. 333-161283) pertaining to the Pioneer Natural Resources Company 2006 Long Term Incentive Plan,

(10) Registration Statement (Form S-8 No. 333-176712) pertaining to the Pioneer Natural Resources Company Employee Stock Purchase Plan,

(11) Registration Statement (Form S-8 No. 333-178671) pertaining to the Pioneer Natural Resources USA, Inc. Profit Sharing 401(k) Plan, the Pioneer Natural Resources Company 2006 Long-Term Incentive Plan and the Pioneer Natural Resources Company Executive Deferred Compensation Plan,

(12) Registration Statement (Form S-8 No. 333-183379) pertaining to the Pioneer Natural Resources Company Employee Stock Purchase Plan, and

(13) Registration Statement (Form S-8 No. 333-193885) pertaining to the Pioneer 2008 PSE Employee Long Term Incentive Plan,

of our reports dated February 26, 2014, with respect to the consolidated financial statements of Pioneer Natural Resources Company and the effectiveness of internal control over financial reporting of Pioneer Natural Resources Company included in this Annual Report (Form 10-K) of Pioneer Natural Resources Company for the year ended December 31, 2013.

/s/ Ernst & Young LLP

Dallas, Texas

February 26, 2014

EX-23.2

EXHIBIT 23.2

CONSENT OF INDEPENDENT PETROLEUM ENGINEERS AND GEOLOGISTS

We hereby consent to the references to our firm, in the context in which they appear, and to the references to and the incorporation by reference of our audit letter dated February 11, 2014, included in the Annual Report on Form 10-K of Pioneer Natural Resources Company (the “Company”) for the fiscal year ended December 31, 2013, as well as in the notes to the financial statements included therein. We also hereby consent to the incorporation by reference of the references to our firm, in the context in which they appear, and to our audit letter dated February 11, 2014, into the Company’s previously filed Registration Statements on Form S-8 (No. 333-176712, No. 333-178671, No. 333-35087, No. 333-39153, No. 333-39249, No. 333-88438, No. 333-136488, No. 333-136489, No. 333-136490, No. 333-161283, No. 333-183379 and No. 333-193885) and on Form S-3 (No. 333-174402) in accordance with the requirements of the Securities Act of 1933, as amended.

NETHERLAND, SEWELL & ASSOCIATES, INC.
By:	/s/ C.H. (Scott) Rees III
	C.H. (Scott) Rees III, P.E. Chairman and Executive Vice President

Dallas, Texas

February 25, 2014

EX-23.3

EXHIBIT 23.3

CONSENT OF INDEPENDENT PETROLEUM ENGINEERS AND GEOLOGISTS

As independent petroleum engineers, we hereby consent to the references to our firm, in the context in which they appear, in the Annual Report on Form 10-K of Pioneer Natural Resources Company (the “Company”) for the fiscal year ended December 31, 2013, as well as in the notes to the financial statements included therein. We also hereby consent to the incorporation by reference of the references to our firm, in the context in which they appear, into the Company’s previously filed Registration Statements on Form S-8 (No. 333-176712, No. 333-178671, No. 333-35087, No. 333-39153, No. 333-39249, No. 333-88438, No. 333-136488, No. 333-136489, No. 333-136490, No. 333-161283, No. 333-183379 and N. 333-193885) and on Form S-3 (No. 333-174402) in accordance with the requirements of the Securities Act of 1933, as amended.

	By:	/s/ Ryder Scott Company, L.P.
		Ryder Scott Company, L.P. TBPE Firm Registration No. F-1580
Denver, Colorado
February 26, 2014

EX-31.1

EXHIBIT 31.1

CHIEF EXECUTIVE OFFICER CERTIFICATION

I, Scott D. Sheffield, certify that:

1. I have reviewed this Annual Report on Form 10-K of Pioneer Natural Resources Company;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

February 26, 2014
	/s/ Scott D. Sheffield
	Scott D. Sheffield, Chairman and Chief Executive Officer

EX-31.2

EXHIBIT 31.2

CHIEF FINANCIAL OFFICER CERTIFICATION

I, Richard P. Dealy, certify that:

1. I have reviewed this Annual Report on Form 10-K of Pioneer Natural Resources Company;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

February 26, 2014
	/s/ Richard P. Dealy
	Richard P. Dealy, Executive Vice President and Chief Financial Officer

EX-32.1

EXHIBIT 32.1

CERTIFICATION OF

CHIEF EXECUTIVE OFFICER

OF PIONEER NATURAL RESOURCES COMPANY

PURSUANT TO 18 U.S.C. § 1350

I, Scott D. Sheffield, Chairman and Chief Executive Officer of Pioneer Natural Resources Company (the "Company"), hereby certify that the accompanying Annual Report on Form 10-K for the year ended December 31, 2013 and filed with the Securities and Exchange Commission pursuant to Section 13(a) of the Securities Exchange Act of 1934 (the "Report") by the Company fully complies with the requirements of that section.

I further certify that the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

	/s/ Scott D. Sheffield
Name:	Scott D. Sheffield, Chairman and Chief Executive Officer
Date:	February 26, 2014

EX-32.2

EXHIBIT 32.2

CERTIFICATION OF

CHIEF FINANCIAL OFFICER

OF PIONEER NATURAL RESOURCES COMPANY

PURSUANT TO 18 U.S.C. § 1350

I, Richard P. Dealy, Executive Vice President and Chief Financial Officer of Pioneer Natural Resources Company (the "Company"), hereby certify that the accompanying Annual Report on Form 10-K for the year ended December 31, 2013 and filed with the Securities and Exchange Commission pursuant to Section 13(a) of the Securities Exchange Act of 1934 (the "Report") by the Company fully complies with the requirements of that section.

I further certify that the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

	/s/ Richard P. Dealy
Name:	Richard P. Dealy, Executive Vice President and Chief Financial Officer
Date:	February 26, 2014

EX-95.1

EXHIBIT 95.1

Mine Safety Disclosure

The following disclosures are provided pursuant to the Dodd-Frank Wall Street Reform and Consumer Protection Act (the "Act") and Item 104 of Regulation S-K, which requires certain disclosures by companies required to file periodic reports under the Securities Exchange Act of 1934, as amended, that operate mines regulated under the Federal Mine Safety and Health Act of 1977 (the "Mine Act").

Whenever the Federal Mine Safety and Health Administration ("MSHA") believes a violation of the Mine Act, any health or safety standard or any regulation has occurred, it may issue a citation which describes the alleged violation and fixes a time within which the U.S. mining operator must abate the alleged violation. In some situations, such as when MSHA believes that conditions pose a hazard to miners, MSHA may issue an order removing miners from the area of the mine affected by the condition until the alleged hazards are corrected. When MSHA issues a citation or order, it generally proposes a civil penalty, or fine, as a result of the alleged violation, that the operator is ordered to pay. Citations and orders can be contested and appealed, and as part of that process, are often reduced in severity and amount, and are sometimes dismissed. The number of citations, orders and proposed assessments vary depending on the size and type (underground or surface) of the mine as well as by the MSHA inspector(s) assigned.

The table below sets forth for the year ended December 31, 2013 for each sand mine of Pioneer Natural Resources Company or its subsidiaries (the "Company"), (i) the total number of citations for violations of mandatory health or safety standards that could significantly and substantially contribute to the cause and effect of mine safety or health hazard under section 104 of the Mine Act for which the operator received a citation from MSHA; (ii) the total number of orders issued under section 104(b) of the Mine Act; (iii) the total number of citations and orders for unwarrantable failure of the mine operator to comply with mandatory health or safety standards under section 104(d) of the Mine Act; (iv) the total number of flagrant violations under section 110(b)(2) of the Mine Act; (v) the total number of imminent danger orders issued under section 107(a) of the Mine Act; (vi) the total dollar value of proposed assessments from MSHA; (vii) the total number of mining-related fatalities; (viii) whether or not the mine has received any notices from MSHA of a pattern of violations of mandatory health or safety standards that are of such nature as could have significantly and substantially contributed to the cause and effect of mine health or safety hazards under section 104(e) of the Mine Act; (ix) whether or not the mine has received any notices from MSHA regarding the potential to have a pattern of violations as referenced in (viii) above; and (x) the total number of pending legal actions before the Federal Mine Safety and Health Review Commission (the "Commission") (as of December 31, 2013) involving such mine, as well as the aggregate number of legal actions instituted and the aggregate number of legal actions resolved during the reporting period. The MSHA citations, orders and assessments are those initially issued or proposed by MSHA. They do not reflect any subsequent changes in the level of severity of a citation or order or the value of an assessment that may occur as a result of proceedings conducted in accordance with MSHA rules.

Mine/MSHA Identification Number(1)	Section  104 S&S Citations	Section 104(b) Orders	Section 104(d) Citations and  Orders	Section 110(b)(2) Violations	Section 107(a) Orders	Total Dollar Value of Proposed Assessments		Mining Related Fatalities	Received Notice of Pattern of Violations under Section 104(e) (yes/no)	Received Notice of Potential to have Pattern under Section 104(e) (yes/no)	Legal Actions Pending as of Last Day of Period	Legal Actions Initiated During Period	Legal Actions Resolved During Period
Orange County Operation / 0402801	—	—	—	—	—	$	—	—	No	No	—	—	—
Riverside Operation / 0404263	2	—	—	—	—	$	324	—	No	No	—	—	—
Colorado Springs Operation / 0503295	—	—	—	—	—	$	—	—	No	No	—	—	—
Glass Rock Operation / 3301354	—	—	—	—	—	$	—	—	No	No	—	—	2
Millwood Operation / 3301355	6	—	—	—	—	$	8,652	—	No	No	—	—	—
Voca Pit and Plant / 4101003	10	—	—	—	—	$	20,149	—	No	No	—	—	—
Brady Plant / 4101371	10	—	—	—	—	$	6,799	—	No	No	—	—	—
Voca West / 4103618	4	—	—	—	—	$	1,366	—	No	No	—	—	—

_______________

(1 ) The definition of mine under section three of the Mine Act includes the mine, as well as other items used in, or to be used in, or resulting from, the work of extracting minerals, such as land, structures, facilities, equipment, machines, tools and minerals preparation facilities. Unless otherwise indicated, any of these other items associated with a single mine have been aggregated in the totals for that mine. MSHA assigns an identification number to each mine and may or may not assign separate identification numbers to related facilities such as preparation facilities.

EX-99.1

EXHIBIT 99.1

February 11, 2014

Mr. Kerry D. Scott

Pioneer Natural Resources Company

5205 North O'Connor Boulevard, Suite 200

Irving, Texas 75039-3746

Dear Mr. Scott:

In accordance with your request, we have audited the estimates prepared by Pioneer Natural Resources Company (Pioneer), as of December 31, 2013, of the proved reserves and future revenue to the Pioneer interest in certain oil and gas properties located in the United States. It is our understanding that the proved reserves estimated herein constitute approximately 94 percent of all proved reserves owned by Pioneer. We have examined the estimates with respect to reserves quantities, reserves categorization, future producing rates, future net revenue, and the present value of such future net revenue, using the definitions set forth in U.S. Securities and Exchange Commission (SEC) Regulation S-X Rule 4-10(a). The estimates of reserves and future revenue have been prepared in accordance with the definitions and regulations of the SEC and, with the exception of the exclusion of future income taxes, conform to the FASB Accounting Standards Codification Topic 932, Extractive Activities-Oil and Gas. We completed our audit on or about the date of this letter. This report has been prepared for Pioneer's use in filing with the SEC; in our opinion the assumptions, data, methods, and procedures used in the preparation of this report are appropriate for such purpose.

The following table sets forth Pioneer's estimates of the net reserves and future net revenue, as of December 31, 2013, for the audited properties:

	Net Reserves			Future Net Revenue (M$)
	Oil	NGL	Gas		Present Worth
Category	(MBBL)	(MBBL)	(MMCF)	Total	at 10%
Proved Developed Producing	224,512	130,991	1,489,857	12,842,923	6,753,231
Proved Developed Non-Producing	11,134	4,551	123,884	893,207	401,189
Proved Undeveloped	81,458	36,808	198,193	4,558,132	1,323,399
Total Proved	317,104	172,350	1,811,933	18,294,262	8,477,819

Totals may not add because of rounding.

The oil volumes shown include crude oil and condensate. Oil and natural gas liquids (NGL) volumes are expressed in thousands of barrels (MBBL); a barrel is equivalent to 42 United States gallons. Gas volumes are expressed in millions of cubic feet (MMCF) at standard temperature and pressure bases.

When compared on a field-by-field basis, some of the estimates of Pioneer are greater and some are less than the estimates of Netherland, Sewell & Associates, Inc. (NSAI). However, in our opinion the estimates of Pioneer's proved reserves and future revenue shown herein are, in the aggregate, reasonable and have been prepared in accordance with the Standards Pertaining to the Estimating and Auditing of Oil and Gas Reserves Information promulgated by the Society of Petroleum Engineers (SPE Standards). Additionally, these estimates are within the recommended 10 percent tolerance threshold set forth in the SPE Standards. We are satisfied with the methods and procedures used by Pioneer in preparing the December 31, 2013, estimates of reserves and future revenue, and we saw nothing of an unusual nature that would cause us to take exception with the estimates, in the aggregate, as prepared by Pioneer.

The estimates shown herein are for proved reserves. Pioneer's estimates do not include probable or possible reserves that may exist for these properties, nor do they include any value for undeveloped acreage beyond those tracts for which undeveloped reserves have been estimated. Reserves categorization conveys the relative degree of certainty; reserves subcategorization is based on development and production status. The estimates of reserves and future revenue included herein have not been adjusted for risk.

Prices used by Pioneer are based on the 12-month unweighted arithmetic average of the first-day-of-the-month price for each month in the period January through December 2013. For oil and NGL volumes, the average Platts Oil Daily West Texas Intermediate (Cushing) spot price of $96.824 per barrel is adjusted by field for quality, transportation fees, and regional price differentials. For gas volumes, the average Platts Gas Daily Henry Hub spot price of $3.673 per MMBTU is adjusted by field for energy content, transportation fees, and regional price differentials. All prices are held constant throughout the lives of the properties. The average adjusted product prices weighted by production over the remaining lives of the properties are $92.79 per barrel of oil, $33.57 per barrel of NGL, and $3.44 per MCF of gas.

Operating costs used by Pioneer are based on historical operating expense records. For nonoperated properties, these costs include the per-well overhead expenses allowed under joint operating agreements along with estimates of costs to be incurred at and below the district and field levels. Operating costs for the operated properties are limited to direct lease- and field-level costs and Pioneer's estimate of the portion of its headquarters general and administrative overhead (G&A) expenses necessary to operate the properties. Pioneer's estimate of G&A expenses is included at the field area level for all areas except for Raton Basin, which is included at the lease level. Capital costs used by Pioneer are based on authorizations for expenditure and actual costs from recent activity. Capital costs are included as required for workovers, new development wells, and production equipment. Abandonment costs used are Pioneer's estimates of the costs to abandon the wells and production facilities, net of any salvage value. Operating, capital, and abandonment costs are not escalated for inflation.

The reserves shown in this report are estimates only and should not be construed as exact quantities. Proved reserves are those quantities of oil and gas which, by analysis of engineering and geoscience data, can be estimated with reasonable certainty to be economically producible; probable and possible reserves are those additional reserves which are sequentially less certain to be recovered than proved reserves. Estimates of reserves may increase or decrease as a result of market conditions, future operations, changes in regulations, or actual reservoir performance. In addition to the primary economic assumptions discussed herein, estimates of Pioneer and NSAI are based on certain assumptions including, but not limited to, that the properties will be developed consistent with current development plans, that the properties will be operated in a prudent manner, that no governmental regulations or controls will be put in place that would impact the ability of the interest owner to recover the reserves, and that projections of future production will prove consistent with actual performance. If the reserves are recovered, the revenues therefrom and the costs related thereto could be more or less than the estimated amounts. Because of governmental policies and uncertainties of supply and demand, the sales rates, prices received for the reserves, and costs incurred in recovering such reserves may vary from assumptions made while preparing these estimates.

It should be understood that our audit does not constitute a complete reserves study of the audited oil and gas properties. Our audit consisted primarily of substantive testing, wherein we conducted a detailed review of all the audited properties. In the conduct of our audit, we have not independently verified the accuracy and completeness of information and data furnished by Pioneer with respect to ownership interests, oil and gas production, well test data, historical costs of operation and development, product prices, or any agreements relating to current and future operations of the properties and sales of production. However, if in the course of our examination something came to our attention that brought into question the validity or sufficiency of any such information or data, we did not rely on such information or data until we had satisfactorily resolved our questions relating thereto or had independently verified such information or data. Our audit did not include a review of Pioneer's overall reserves management processes and practices.

We used standard engineering and geoscience methods, or a combination of methods, including performance analysis, volumetric analysis, analogy, and reservoir modeling, that we considered to be appropriate and necessary to establish the conclusions set forth herein. As in all aspects of oil and gas evaluation, there are uncertainties inherent in the interpretation of engineering and geoscience data; therefore, our conclusions necessarily represent only informed professional judgment.

Supporting data documenting this audit, along with data provided by Pioneer, are on file in our office. The technical persons responsible for conducting this audit meet the requirements regarding qualifications, independence, objectivity, and confidentiality set forth in the SPE Standards. We are independent petroleum engineers, geologists, geophysicists, and petrophysicists; we do not own an interest in these properties nor are we employed on a contingent basis.

Sincerely,
NETHERLAND, SEWELL & ASSOCIATES, INC.
Texas Registered Engineering Firm F-2699
	/s/ C.H. (Scott) Rees III
By:
	C.H. (Scott) Rees III, P.E. Chairman and Chief Executive Officer
	/s/ G. Lance Binder
By:
	G. Lance Binder, P.E. 61794 Executive Vice President
Date Signed: February 11, 2014

GLB:LKT

Please be advised that the digital document you are viewing is provided by Netherland, Sewell & Associates, Inc. (NSAI) as a convenience to our clients. The digital document is intended to be substantively the same as the original signed document maintained by NSAI. The digital document is subject to the parameters, limitations, and conditions stated in the original document. In the event of any differences between the digital document and the original document, the original document shall control and supersede the digital document.

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Other Expense (Tables)

12 Months Ended

Dec. 31, 2013

Other Expense [Abstract]

Schedule Of Components Of Other Expense

The following table provides the components of the Company's other expense during the years ended December 31, 2013, 2012 and 2011:

	Year Ended December 31,
	2013		2012		2011
	(in thousands)
Impairment of inventory and other property and equipment (a)	$	61,812	$	5,719	$	3,126
Transportation commitment charge (b)	39,121		38,830		23,841
Other	16,386		17,940		11,884
Above market and idle drilling and well service equipment charges (c)	9,771		33,124		20,163
Contingency and environmental accrual adjustments	9,277		478		4,057
Terminated drilling rig contract charges (d)	1,019		15,747		—
Premier Silica acquisition costs	—		2,337		—
Total other expense	$	137,386	$	114,175	$	63,071

 ____________________

(a) Represents charges of $36.3 million to reduce excess materials and supplies inventories to their market value and a charge of $25.5 million to reduce the carrying value of Sendero to its estimated fair value. See Notes C and D for additional information on the fair value of Sendero and material and supplies inventory, respectively.

(b) Primarily represents firm transportation payments on excess pipeline capacity commitments.

(c) Primarily represents expenses attributable to the portion of Pioneer's contracted drilling rig rates that were above market rates and idle drilling rig and fracture stimulation fleet fees, neither of which were chargeable to joint operations.

(d) Primarily represents charges to terminate rig contracts that were not required to meet planned drilling activities.

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Disclosures About Fair Value Measurements Disclosures About Fair Value Measurements (Fair Value of Assets Classified as Held For Sale) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of oil and gas properties	$ 1,495,242,000		$ 0		$ 354,408,000
Tangible Asset Impairment Charges	61,812,000	[1]	5,719,000	[1]	3,126,000	[1]
Pioneer Alaska [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value of Asset Group	350,600,000
Barnett Shale Field [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value of Asset Group	180,400,000
Sendero [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value of Asset Group	31,400,000
Tangible Asset Impairment Charges	25,500,000
Discontinued Operations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of oil and gas properties	729,305,000	[2]	532,589,000	[2]	0	[2]
Discontinued Operations [Member] | Pioneer Alaska [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of oil and gas properties	539,800,000
Discontinued Operations [Member] | Barnett Shale Field [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of oil and gas properties	$ 189,500,000

[1] Represents charges of $36.3 million to reduce excess materials and supplies inventories to their market value and a charge of $25.5 million to reduce the carrying value of Sendero to its estimated fair value. See Notes C and D for additional information on the fair value of Sendero and material and supplies inventory, respectively.

[2] (c)Represents a noncash impairment charge of $539.8 million on Pioneer Alaska net assets during the year ended December 31, 2013 and noncash impairment charges of $189.5 million and $532.6 million during the years ended December 31, 2013 and 2012, respectively, on the Company's net assets in the Barnett Shale field. See Note D for additional information regarding the noncash impairment charges.

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Acquisitions and Divestitures (Discontinued Operations Narrative) (Details) (USD $)	12 Months Ended								3 Months Ended		12 Months Ended						12 Months Ended						3 Months Ended	12 Months Ended				12 Months Ended			3 Months Ended	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2013 Wolfcamp [Member] Rate	Mar. 31, 2013 Wolfcamp [Member]	Mar. 31, 2013 West Panhandle [Member]	Mar. 31, 2012 Eagle Ford Shale [Member]	Dec. 31, 2013 Other Assets [Member]	Dec. 31, 2012 Other Assets [Member]	Dec. 31, 2011 Other Assets [Member]	Dec. 31, 2012 Barnett Shale Field [Member]	Dec. 31, 2013 Lease Contract for Next 12 Months [Member]	Dec. 31, 2013 Lease Contract for Year 2 [Member]	Dec. 31, 2013 Discontinued Operations [Member]		Dec. 31, 2012 Discontinued Operations [Member]		Dec. 31, 2011 Discontinued Operations [Member]		Sep. 30, 2012 Discontinued Operations [Member] Pioneer Alaska [Member]	Dec. 31, 2013 Discontinued Operations [Member] Pioneer Alaska [Member]	Dec. 31, 2013 Discontinued Operations [Member] Barnett Shale Field [Member]	Dec. 31, 2012 Discontinued Operations [Member] Pioneer South Africa [Member]	Mar. 31, 2012 Discontinued Operations [Member] Pioneer South Africa [Member]	Dec. 31, 2011 Discontinued Operations [Member] Pioneer Tunisia [Member]	Dec. 17, 2013 Pioneer Southwest [Member]	Dec. 31, 2012 Premier Silica [Member]	Dec. 31, 2013 Sendero [Member]	Dec. 31, 2013 Sendero [Member]
Discontinued Operations Assets and Liabilities Included in Assets and Liabilities Held for Sale [Line Items]
Share Per Unit Exchange Ratio																													0.2325
Issuance of treasury stock to acquire outstanding PSE units, shares	3,956,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net																														$ 297,100,000
Proceeds from Divestiture of Interest in Consolidated Subsidiaries																										15,900,000		802,500,000			31,000,000
Tangible Asset Impairment Charges	61,812,000	[1]	5,719,000	[1]	3,126,000	[1]																										25,500,000
Drilling rigs leased															12	8
Gain (Loss) on disposition of assets, net	209,021,000		45,898,000		(3,644,000)		181,300,000		22,400,000	42,600,000	5,300,000	3,300,000	(3,600,000)				8,764,000	[2]	40,735,000	[2]	645,241,000	[2]	12,600,000		8,700,000	28,600,000		645,200,000
Joint Venture Investment Ownership Percentage							40.00%
Significant Acquisitions and Disposals, Acquisition Costs or Sale Proceeds								1,800,000,000																350,600,000			60,000,000
Proceeds from disposition of assets, net of cash sold	711,027,000		95,564,000		819,044,000		623,800,000		38,100,000	54,700,000													10,100,000		33,800,000
Maximum Payments From Related Party For Exploration Drilling And Completion Costs							1,200,000,000
Payments From Related Party For Exploration Drilling And Completion Costs Percent							75.00%
Impairment of oil and gas properties	$ 1,495,242,000		$ 0		$ 354,408,000									$ 532,600,000			$ 729,305,000	[3]	$ 532,589,000	[3]	$ 0	[3]		$ 539,800,000	$ 189,500,000

[1] Represents charges of $36.3 million to reduce excess materials and supplies inventories to their market value and a charge of $25.5 million to reduce the carrying value of Sendero to its estimated fair value. See Notes C and D for additional information on the fair value of Sendero and material and supplies inventory, respectively.

[2] (a)Primarily comprised of Alaskan Petroleum Production Tax credits on qualifying capital expenditures of $38.6 million, $29.3 million and $38.9 million for the years ended December 31, 2013, 2012 and 2011, respectively.

[3] (c)Represents a noncash impairment charge of $539.8 million on Pioneer Alaska net assets during the year ended December 31, 2013 and noncash impairment charges of $189.5 million and $532.6 million during the years ended December 31, 2013 and 2012, respectively, on the Company's net assets in the Barnett Shale field. See Note D for additional information regarding the noncash impairment charges.

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Incentive Plans (Number Of Shares Available Under The Company's Long Term Incentive Plan) (Details) (Pioneer Long-Term Incentive Plan [Member])	92 Months Ended
	Dec. 31, 2013
Pioneer Long-Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Approved and authorized awards	9,100,000
Shares issued	(6,506,571)
Awards available for future grant	2,593,429

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Disclosures About Fair Value Measurements (Financial Assets and Liabilities Not Carried At Fair Value) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Fair Value Assets and Liabilities Not Carried At Fair Value [Line Items]
Long-term Debt	$ 2,653,059	$ 3,721,193
Reported Value Measurement [Member]
Fair Value Assets and Liabilities Not Carried At Fair Value [Line Items]
Long-term Debt	2,653,059	3,721,193
Estimate of Fair Value Measurement [Member]
Fair Value Assets and Liabilities Not Carried At Fair Value [Line Items]
Long-term Debt	$ 3,018,830	$ 4,555,770

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Incentive Plans (Schedule Of Employee Stock Purchase Plan) (Details) (Employee Stock [Member])	204 Months Ended
	Dec. 31, 2013
Employee Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Approved and authorized shares	1,250,000
Shares issued	(734,972)
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	515,028

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Summary Of Significant Accounting Policies (Changes of Ownership Interest) (Details) (USD $) Share data in Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Net Income (loss) attributable to common stockholders	$ (838,414,000)	$ 192,285,000	$ 834,489,000
Pioneer Southwest noncontrolling interest transferred to APIC	0
Deferred tax provision attributable to 2008 Pioneer Southwest initial public offering		(49,072,000)
Deferred tax benefit associated with the Pioneer Southwest merger	200,091,000
Pioneer Southwest merger transaction costs	(3,880,000)
Net transfers from noncontrolling interest	364,896,000	(49,072,000)	35,019,000
Net income (loss) attributable to common stockholders and transfers from noncontrolling interest	(473,518,000)	143,213,000	869,508,000
Units Issued, Tax		23,700,000
Sale of Common Units	9.5	1.8
Sale of Units, Tax		15,400,000
Pioneer Southwest [Member]
Sale of Pioneer Southwest common units, net of tax			35,091,000
Issuance of Pioneer Southwest common units, net of tax			48,792,000
Issued Common Units		2.6
Additional Paid-In Capital [Member]
Pioneer Southwest noncontrolling interest transferred to APIC	(168,685,000)
Deferred tax provision attributable to 2008 Pioneer Southwest initial public offering		(49,072,000)
Deferred tax benefit associated with the Pioneer Southwest merger	200,091,000
Pioneer Southwest merger transaction costs	(3,880,000)
Additional Paid-In Capital [Member] | Pioneer Southwest [Member]
Sale of Pioneer Southwest common units, net of tax	0	0	26,915,000
Issuance of Pioneer Southwest common units, net of tax	0	0	8,104,000
Pioneer Southwest noncontrolling interest transferred to APIC	(168,685,000)	0	0
Deferred tax provision attributable to 2008 Pioneer Southwest initial public offering	0	(49,072,000)	0
Deferred tax benefit associated with the Pioneer Southwest merger	200,091,000	0	0
Pioneer Southwest merger transaction costs	$ (3,880,000)	$ 0	$ 0

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Incentive Plans (Tables)

12 Months Ended

Dec. 31, 2013

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule Of Compensation Expense For Each Type Of Incentive Award

The following table reflects stock-based compensation expense recorded for each type of incentive award and the associated income tax benefit for the years ended December 31, 2013, 2012 and 2011:

	Year Ended December 31,
	2013		2012		2011
	(in thousands)
Restricted stock-equity awards	$	56,165	$	48,876	$	32,861
Restricted stock-Liability Awards	40,404		22,419		10,882
Stock options (a)	2,952		4,110		2,936
Performance unit awards	9,131		6,162		4,500
Pioneer Southwest LTIP	1,029		1,098		761
Sendero Series B units	1,020		982		1,020
ESPP	1,731		2,437		125
Total	$	112,432	$	86,084	$	53,085
Income tax benefit	$	36,298	$	27,901	$	22,084

 _____________________

(a) Cash proceeds received from stock option exercises during 2013, 2012 and 2011 amounted to $5.0 million, $3.1 million and $619 thousand, respectively.

Number Of Shares Available Under The Company's Long Term Incentive Plan

The following table shows the number of shares available for issuance pursuant to awards under the Company's LTIP at December 31, 2013:

Approved and authorized awards	9,100,000
Awards issued after May 3, 2006	(6,506,571	)
Awards available for future grant	2,593,429

Schedule Of Restricted Stock Award Activity

The following table reflects the restricted stock award activity for the year ended December 31, 2013:

	Equity Awards				Liability Awards
	Number of Shares		Weighted Average Grant- Date Fair Value		Number of Shares
Outstanding at beginning of year	1,512,762		$	96.22	405,916
Shares granted	433,311		$	134.58	250,641
Shares forfeited	(80,150	)	$	116.50	(35,813	)
Shares vested	(517,908	)	$	70.22	(198,362	)
Outstanding at end of year	1,348,015		$	117.09	422,382

Schedule Of Weighted-Average Assumptions To Estimate The Fair Value

The Company used the following weighted-average assumptions to estimate the fair value of stock options granted during the years ended December 31, 2012 and 2011:

	2012		2011
Expected option life - years	7.0		7.0
Volatility	49.4	%	47.6	%
Risk-free interest rate	1.5	%	2.9	%
Dividend yield	0.4	%	0.4	%

Schedule Of Stock Options Awards Activity

A summary of the Company's nonstatutory stock option awards activity for the year ended December 31, 2013 is presented below:

	Number of Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Life	Aggregate Intrinsic Value
					(in years)	(in thousands)
Outstanding at beginning of year	467,486		$	59.63
Options expired and forfeited	(11,085	)	$	106.90
Options exercised	(166,474	)	$	29.88
Outstanding and expected to vest, at end of year	289,927		$	74.90	6.80	$	31,651
Exercisable at end of year	115,290		$	26.74	5.48	$	18,139

Schedule of Assumptions Used [Table Text Block]

The Company used the following assumptions to estimate the fair value of performance unit awards granted during 2013, 2012 and 2011:

	2013				2012				2011
Risk-free interest rate	0.40%				0.40%				1.32%
Range of volatilities	30.4	%	-	42.9%	33.6	%	-	49.0%	50.2	%	-	84.1%

Schedule Of Performance Unit Activity

The following table summarizes the performance unit activity for the year ended December 31, 2013:

	Number of Units (a)		Weighted  Average Grant-Date Fair Value
Beginning performance unit awards	91,370		$	154.53
Units granted	94,917		$	189.23
Units forfeited	(10,842	)	$	172.02
Units vested (b)	(40,969	)	$	134.68
Ending performance unit awards	134,476		$	183.66

 _____________________

(a) These amounts reflect the number of performance units granted. The actual payout of shares may be between zero percent and 250 percent of the performance units granted depending upon the total shareholder return ranking of the Company compared to peer companies at the vesting date.

(b) On December 31, 2013, the service period lapsed on 40,969 of these performance unit awards. The lapsed units earned 2.5 shares for each vested award representing 102,424 aggregate shares of common stock issued on January 2, 2014.

Number Of Awards Available Under PSE Long Term Incentive Plan

The following table shows the number of Pioneer common shares available for issuance pursuant to awards under the PSE LTIP at December 31, 2013:

Awards approved and outstanding	678,034
Awards issued under the PSE LTIP (a)	(23,192	)
Awards available for future grant (b)	654,842

_____________________

(a) Shares that represent outstanding awards originally granted under the Pioneer Southwest LTIP that have been assumed and adopted by the Company in connection with, and that continue to be outstanding after, the Pioneer Southwest merger.

(b) Shares that have not been issued and are not subject to outstanding awards granted under the Pioneer Southwest LTIP.

Schedule Of PSE Restricted Stock Award Activity

The following table summarizes the activity of phantom unit awards issued under the Pioneer Southwest LTIP during 2013, which were converted to restricted stock units of the Company under the PSE LTIP based upon the Conversion Ratio:

	Phantom Unit Awards
	Number of Awards (a)		Weighted Average Grant-Date Fair Value
Outstanding awards at beginning of year	23,865		$	117.94
Units granted	7,492		$	110.32
Lapse of restrictions	(8,165	)	$	97.81
Outstanding awards at end of year	23,192		$	122.55

_____________________

(a) Reflects the number of awards in Pioneer common stock after the Pioneer Southwest merger based upon the Conversion Ratio.

Schedule Of Employee Stock Purchase Plan

The following table shows the number of shares available for issuance under the ESPP at December 31, 2013:

Approved and authorized shares	1,250,000
Shares issued	(734,972	)
Shares available for future issuance	515,028

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Asset Retirement Obligations (Details) (USD $)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Asset Retirement Obligations, Beginning Balance	$ 197,754,000		$ 136,742,000		$ 152,291,000
AssetRetirementObligationLiabilitiesAcquiredInBusinessCombination	0		10,498,000		6,000
Liabilities incurred	5,775,000		9,593,000		9,233,000
Changes in estimates	7,939,000	[1]	51,536,000	[1]	7,490,000	[1]
Liabilities reclassified to discontinued operations held for sale	(10,091,000)		0		(29,892,000)
Disposition of wells	(6,083,000)		(2,536,000)		(448,000)
Liabilities settled	(13,953,000)		(18,066,000)		(12,880,000)
Accretion of discount on continuing operations	11,862,000		8,677,000		7,506,000
Asset Retirement Obligation Accretion Expense Integrated Services	14,000	[2]	100,000	[2]	0	[2]
Accretion of discount on discontinued operations	831,000		1,210,000		3,436,000
Asset Retirement Obligations, Ending Balance	194,048,000		197,754,000		136,742,000
Asset retirement obligations, current portion	$ 19,300,000		$ 13,300,000

[1] (a)The changes in the 2013, 2012 and 2011 estimates are primarily due to increases in abandonment cost estimates based on recent actual costs incurred to abandon wells and declines in credit-adjusted risk-free discount rates used to value increases in asset retirement obligations. The increases in 2013 and 2011 estimates were partially offset by higher commodity prices, which had the effect of lengthening the economic life of certain wells and decreasing the present value of future retirement obligations. The increase in the 2012 estimate was further impacted by declines in oil, NGL and gas prices used to calculate proved reserves, which had the effect of shortening the economic life of certain wells and increasing the present value of future retirement obligations.

[2] (b)Accretion of discount from integrated services includes Premier Silica accretion expense, which is recorded as a reduction in income from vertical integration services in interest and other income in the Company's accompanying consolidated statements of operations. See Note M for more information about interest and other income.

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Incentive Plans (Schedule Of Stock Options Awards Activity) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options exercised	(222,000)	(195,000)	(76,000)
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Outstanding at beginning of year	467,486
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period	(11,085)
Options exercised	(166,474)
Number of Shares, Outstanding and expected to vest at end of year	289,927
Number of Shares, Exercisable at end of year	115,290
Weighted Average Exercise Price, Outstanding at beginning of year	$ 59.63
Weighted Average Exercise Price, Options expired and forfeited	$ 106.90
Weighted Average Exercise Price, Options exercised	$ 29.88
Weighted Average Exercise Price, Outstanding and expected to vest at end of year	$ 74.90
Weighted Average Exercise Price, Exercisable at end of year	$ 26.74
Weighted Average Remaining Contractual Life, Outstanding and expected to vest at end of year	6 years 9 months 19 days
Weighted Average Remaining Contractual Life, Exercisable at end of year	5 years 5 months 24 days
Aggregate Intrinsic Value, Outstanding and expected to vest at end of year	$ 31,651
Aggregate Intrinsic Value, Exercisable at end of year	$ 18,139

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Income Taxes (Summary Of Open Tax Years, By Jurisdiction) (Details)	12 Months Ended
	Dec. 31, 2013
United States [Member]
Income Tax Contingency [Line Items]
Open tax years, by jurisdiction	2012
Various U.S. States [Member]
Income Tax Contingency [Line Items]
Open tax years, by jurisdiction	2009
South Africa [Member]
Income Tax Contingency [Line Items]
Open tax years, by jurisdiction	2008

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Derivative Financial Instruments (Oil Derivative Contracts Volume And Weighted Average Price) (Details)	12 Months Ended
	Dec. 31, 2013 Rollfactor Swap Contracts [Member]	Dec. 31, 2013 Oil contracts, price per bbl [Member] Swap Contracts for Next Twelve Months [Member]	Dec. 31, 2013 Oil contracts, price per bbl [Member] Swap Contracts for Year 2 [Member]	Dec. 31, 2013 Oil contracts, price per bbl [Member] Swap Contracts for Year 3 [Member]	Dec. 31, 2013 Oil contracts, price per bbl [Member] Collar Contracts With Short Puts for Next Twelve Months [Member]	Dec. 31, 2013 Oil contracts, price per bbl [Member] Collar Contracts With Short Puts for Next Twelve Months [Member] Short Put [Member]	Dec. 31, 2013 Oil contracts, price per bbl [Member] Collar Contracts With Short Puts for Year 2 [Member]	Dec. 31, 2013 Oil contracts, price per bbl [Member] Collar Contracts With Short Puts for Year 2 [Member] Short Put [Member]	Dec. 31, 2013 Oil contracts, price per bbl [Member] Collar Contracts With Short Puts for Year 3 [Member]	Dec. 31, 2013 Oil contracts, price per bbl [Member] Collar Contracts With Short Puts for Year 3 [Member] Short Put [Member]	Feb. 20, 2014 Oil contracts, price per bbl [Member] Rollfactor Swap Contracts for March Through December 2014 [Member]	Feb. 20, 2014 Oil contracts, price per bbl [Member] Rollfactor Swap Contracts for Year 2 [Member]	Dec. 31, 2013 Oil contracts [Member] Swap Contracts for Next Twelve Months [Member]	Dec. 31, 2013 Oil contracts [Member] Swap Contracts for Year 2 [Member]	Dec. 31, 2013 Oil contracts [Member] Swap Contracts for Year 3 [Member]	Dec. 31, 2013 Oil contracts [Member] Collar Contracts With Short Puts for Next Twelve Months [Member]	Dec. 31, 2013 Oil contracts [Member] Collar Contracts With Short Puts for Year 2 [Member]	Dec. 31, 2013 Oil contracts [Member] Collar Contracts With Short Puts for Year 3 [Member]	Feb. 20, 2014 Oil contracts [Member] Rollfactor Swap Contracts for March Through December 2014 [Member]	Feb. 20, 2014 Oil contracts [Member] Rollfactor Swap Contracts for Year 2 [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Derivative, Nonmonetary Notional Amount													10,000	0	0	69,000	85,000	25,000	5,000	5,000
Derivative, Swap Type, Average Fixed Price		93.87	0.00	0.00
Derivative, Average Cap Price					114.05		98.98		93.30
Derivative, Average Floor Price					93.70		88.06		85.00
Derivative, Notional Amount, Price Per Unit						77.61		73.06		70.00	0.82	0.60
Swap Multiple Second Nearby Month	0.6667
Swap Multiple Third Nearby Month	0.3333

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Incentive Plans (Number Of Awards Available Under Company's Long Term Incentive Plan) (Details) (Pioneer Southwest Employee Long Term Incentive Plan [Member])	12 Months Ended
	Dec. 31, 2013	Dec. 17, 2013
Pioneer Southwest Employee Long Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards available for future grant	654,842	678,034
Shares issued	(23,192)

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Interest And Other Income (Interest And Other Income) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Interest and Other Income [Abstract]
Other income	$ 8,282,000		$ 5,382,000		$ 9,125,000
Equity interest in income (loss) of EFS Midstream	7,266,000		2,183,000		1,925,000
Deferred compensation plan income	5,954,000		1,872,000		1,657,000
Interest income	321,000		1,465,000		697,000
Third-party income from vertical integration services	(4,862,000)	[1]	(11,934,000)	[1]	15,978,000	[1]
Total interest and other income	16,961,000		(1,032,000)		29,382,000
GrossRevenuesIncludedInThirdPartyIncomeFromVerticalIntegrationServices	284,900,000		247,800,000		50,900,000
GrossExpensesIncludedInThirdPartyIncomeFromVerticalIntegrationServices	$ 289,800,000		$ 259,700,000		$ 34,900,000

[1] Income (loss) from vertical integration services represent net margins that result from Company-provided fracture stimulation, drilling and related service operations, which are ancillary to and supportive of the Company's oil and gas joint operating activities, and do not represent intercompany transactions. For the three years ended December 31, 2013, 2012 and 2011, these net margins include $284.9 million, $247.8 million and $50.9 million of gross vertical integration revenues, respectively and $289.8 million, $259.7 million and $34.9 million of total vertical integration costs and expenses, respectively.

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Commitments And Contingencies (Future Minimum Lease Commitments) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]
Year 1 Minimum Lease Commitments	$ 25,305
Year 2 Minimum Lease Commitments	18,495
Year 3 Minimum Lease Commitments	16,135
Year 4 Minimum Lease Commitments	15,637
Year 5 Minimum Lease Commitments	15,418
Thereafter	$ 26,569

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Other Expense (Schedule Of Components Of Other Expense) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Tangible Asset Impairment Charges	$ 61,812	[1]	$ 5,719	[1]	$ 3,126	[1]
Transportation commitment charge	39,121	[2]	38,830	[2]	23,841	[2]
Other	16,386		17,940		11,884
Above market drilling and rig termination costs	9,771	[3]	33,124	[3]	20,163	[3]
Contingency and environmental accrual adjustments	9,277		478		4,057
Terminated Drilling Rig Expense	1,019	[4]	15,747	[4]	0	[4]
Business Combination, Acquisition Related Costs	0		2,337		0
Total other expense	137,386		114,175		63,071
Inventory [Member]
Tangible Asset Impairment Charges	36,300
Sendero [Member]
Tangible Asset Impairment Charges	$ 25,500

[1] Represents charges of $36.3 million to reduce excess materials and supplies inventories to their market value and a charge of $25.5 million to reduce the carrying value of Sendero to its estimated fair value. See Notes C and D for additional information on the fair value of Sendero and material and supplies inventory, respectively.

[2] Primarily represents firm transportation payments on excess pipeline capacity commitments.

[3] Primarily represents expenses attributable to the portion of Pioneer's contracted drilling rig rates that were above market rates and idle drilling rig and fracture stimulation fleet fees, neither of which were chargeable to joint operations.

[4] Primarily represents charges to terminate rig contracts that were not required to meet planned drilling activities.

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Incentive Plans (Schedule Of Integral Part Of Consolidated Financial Statements) (Details) (PSE Ltip Phantom Units [Member], USD $)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
PSE Ltip Phantom Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares/Units, Outstanding at beginning of year	23,865	[1]
Number of Units granted	7,492	[1]
Number of Units Lapse of restrictions	(8,165)	[1]
Number of Shares/Units, Outstanding at end of year	23,192	[1]	23,865	[1]
Weighted Average Grant-Date Fair Value, Outstanding at beginning of year	$ 117.94
Weighted Average Grant-Date Fair Value, Shares granted	$ 110.32		$ 120.43		$ 138.32
Weighted Average Grant Date Fair Value Lapse of restrictions	$ 97.81
Weighted Average Grant-Date Fair Value, Outstanding at end of year	$ 122.55		$ 117.94

[1] (a)Reflects the number of awards in Pioneer common stock after the Pioneer Southwest merger based upon the Conversion Ratio.

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Incentive Plans (Schedule Of Restricted Stock Award Activity) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Restricted Stock Equity Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares/Units, Outstanding at beginning of year	1,512,762
Number of Shares granted	433,311
Forfeitures, number of shares	(80,150)
Awards vested	(517,908)
Number of Shares/Units, Outstanding at end of year	1,348,015	1,512,762
Weighted Average Grant-Date Fair Value, Outstanding at beginning of year	$ 96.22
Weighted Average Grant-Date Fair Value, Shares granted	$ 134.58	$ 113.02	$ 97.52
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value	$ 116.50
Weighted Average Grant-Date Fair Value, Shares vested	$ 70.22
Weighted Average Grant-Date Fair Value, Outstanding at end of year	$ 117.09	$ 96.22
Restricted Stock Liability Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares/Units, Outstanding at beginning of year	405,916
Number of Shares granted	250,641
Forfeitures, number of shares	(35,813)
Awards vested	(198,362)
Number of Shares/Units, Outstanding at end of year	422,382

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Summary Of Significant Accounting Policies (Policy)

12 Months Ended

Dec. 31, 2013

Accounting Policies [Abstract]

Principles Of Consolidation

Principles of consolidation. The consolidated financial statements include the accounts of the Company and its wholly-owned and majority-owned subsidiaries since their acquisition or formation. In accordance with generally accepted accounting principles in the United States ("GAAP"), the Company proportionately consolidates certain affiliate partnerships that are less than wholly-owned and are involved in oil and gas producing activities. All material intercompany balances and transactions have been eliminated.

Certain reclassifications have been made to the 2012 and 2011 financial statement and footnote amounts in order to conform them to the 2013 presentations.

In addition, the presentation of purchases and sales of third-party oil and gas has been revised in 2012 and 2011 to present separately the gross sales of purchased oil and gas and costs of purchased oil and gas. Previously, the sales and purchases were netted in other expense. Revenues and costs from the purchase and sale transactions are presented on a gross basis as the Company acts as a principal in the transactions by assuming the risks and rewards of ownership, including credit risk, of the oil and gas purchased and assumes responsibility to deliver the oil and gas volumes sold. This revision did not impact the Company's balance sheet, net income (loss) from continuing operations, equity or cash flows. While not material to the 2012 and 2011 financial statements as a whole, the presentation has been revised to enhance consistency. The following individual line items were affected in addition to total revenues and other income, and total costs and expenses:

	Year Ended December 31,
	2012		2011
	(in thousands)
Sales of purchased oil and gas, as previously reported	$	—	$	—
Revision of sales of purchased oil and gas	122,093		14,542
Sales of purchased oil and gas, reported herein	$	122,093	$	14,542
Purchased oil and gas, as previously reported	$	—	$	—
Revision of purchased oil and gas	120,408		13,949
Purchased oil and gas, reported herein	$	120,408	$	13,949
Other expense, as previously reported (excluding amounts included in discontinued operations)	$	112,490	$	62,478
Revision of other expense	1,685		593
Other expense, reported herein	$	114,175	$	63,071

Use Of Estimates In The Preparation Of Financial Statements

Use of estimates in the preparation of financial statements. Preparation of the accompanying consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting periods. Depletion of oil and gas properties and impairment of goodwill and proved and unproved oil and gas properties, in part, is determined using estimates of proved, probable and possible oil and gas reserves. There are numerous uncertainties inherent in the estimation of quantities of proved, probable and possible reserves and in the projection of future rates of production and the timing of development expenditures. Similarly, evaluations for impairment of proved and unproved oil and gas properties are subject to numerous uncertainties including, among others, estimates of future recoverable reserves and commodity price outlooks. Actual results could differ from the estimates and assumptions utilized.

Cash Equivalents

Cash and cash equivalents. The Company's cash and cash equivalents include depository accounts held by banks and marketable securities with original issuance maturities of 90 days or less.

Accounts Receivable

Accounts receivable. As of December 31, 2013 and 2012, the Company had accounts receivable – trade, net of allowances for bad debts, of $430.7 million and $316.9 million, respectively. The Company's accounts receivable – trade are primarily comprised of oil and gas sales receivables, joint interest receivables and other receivables for which the Company does not require collateral security.

As of December 31, 2013 and 2012, the Company's allowances for doubtful accounts totaled $1.4 million and $1.5 million, respectively. The Company establishes allowances for bad debts equal to the estimable portions of accounts receivable for which failure to collect is considered probable. The Company estimates the portions of joint interest receivables for which failure to collect is probable based on percentages of joint interest receivables that are past due. The Company estimates the portions of other receivables for which failure to collect is probable based on the relevant facts and circumstances surrounding the receivable. Allowances for doubtful accounts are recorded as reductions to the carrying values of the receivables included in the Company's consolidated balance sheets and as charges to other expense in the consolidated statements of operations in the accounting periods during which failure to collect an estimable portion is determined to be probable.

Inventories

Inventories. The Company's inventories consist of materials, supplies and commodities. The Company's materials and supplies inventory is primarily comprised of oil and gas drilling or repair items such as tubing, casing, proppant used to fracture-stimulate oil and gas wells, chemicals, operating supplies and ordinary maintenance materials and parts. The materials and supplies inventory is primarily acquired for use in future drilling operations or repair operations and is carried at the lower of cost or market, on a first-in, first-out cost basis. Valuation reserve allowances for materials and supplies inventories are recorded as reductions to the carrying values of the materials and supply inventories in the Company's consolidated balance sheets and as charges to other expense in the accompanying consolidated statements of operations.

Commodities inventories are carried at the lower of average cost or market, on a first-in, first-out basis. The Company's commodities inventories consist of oil held in storage and natural gas liquids ("NGLs") and gas pipeline fill volumes. Any valuation allowances of commodities inventories are recorded as reductions to the carrying values of the commodities inventories included in the Company's consolidated balance sheets and as charges to other expense in the consolidated statements of operations.

The following table presents the Company's materials and supplies and commodities inventories as of December 31, 2013 and 2012:

	Year Ended December 31,
	2013			2012
	(in thousands)
Materials and supplies (a)	$	210,792		$	258,962
Commodities	13,429			5,446
Less: Noncurrent materials and supplies (b)	(4,096		)	(67,352		)
	$	220,125		$	197,056

____________________

(a) As of December 31, 2013 and 2012, the Company's materials and supplies inventories were net of valuation reserve allowances of $31.8 million and $4.6 million, respectively. See Note D for additional information regarding inventory impairments.

(b) Included in other noncurrent assets in the Company's accompanying consolidated balance sheet.

Oil And Gas Properties

Oil and gas properties. The Company utilizes the successful efforts method of accounting for its oil and gas properties. Under this method, all costs associated with productive wells and nonproductive development wells are capitalized while nonproductive exploration costs and geological and geophysical expenditures are expensed. The Company capitalizes interest on expenditures for significant development projects, generally when the underlying project is sanctioned, until such projects are ready for their intended use. For large development projects requiring significant upfront development costs to support the drilling and production of a planned group of wells, the Company continues to capitalize interest on the portion of the development costs attributable to the planned wells yet to be drilled.

The Company does not carry the costs of drilling an exploratory well as an asset in its consolidated balance sheets following the completion of drilling unless both of the following conditions are met:

(i) The well has found a sufficient quantity of reserves to justify its completion as a producing well.

(ii) The Company is making sufficient progress assessing the reserves and the economic and operating viability of the project.

Due to the capital intensive nature and the geographical location of certain projects, it may take an extended period of time to evaluate the future potential of an exploration project and the economics associated with making a determination on its commercial viability. In these instances, the project's feasibility is not contingent upon price improvements or advances in technology, but rather the Company's ongoing efforts and expenditures related to accurately predicting the hydrocarbon recoverability based on well information, gaining access to other companies' production data in the area, transportation or processing facilities and/or getting partner approval to drill additional appraisal wells. These activities are ongoing and are being pursued constantly. Consequently, the Company's assessment of suspended exploratory well costs is continuous until a decision can be made that the project has found sufficient proved reserves to sanction the project or is noncommercial and is charged to exploration and abandonments expense. See Note F for additional information regarding the Company's suspended exploratory well costs.

The Company owns interests in six gas processing plants and nine treating facilities. The Company is the operator of two of the gas processing plants and all nine of the treating facilities. The Company's ownership interests in the gas processing plants and treating facilities are primarily to accommodate handling the Company's gas production and thus are considered a component of the capital and operating costs of the respective fields that they service. To the extent that there is excess capacity at a plant or treating facility, the Company attempts to process third party gas volumes for a fee to keep the plant or treating facility at capacity. All revenues and expenses derived from third party gas volumes processed through the plants and treating facilities are reported as components of oil and gas production costs. Third party revenues generated from the processing plants and treating facilities in continuing operations for the three years ended December 31, 2013, 2012 and 2011 were $57.2 million, $34.4 million and $42.6 million, respectively. Third party expenses attributable to the processing plants and treating facilities in continuing operations for the same respective periods were $30.1 million, $26.5 million and $22.6 million. The capitalized costs of the plants and treating facilities are included in proved oil and gas properties and are depleted using the unit-of-production method along with the other capitalized costs of the field that they service.

The capitalized costs of proved properties are depleted using the unit-of-production method based on proved reserves. Costs of significant nonproducing properties, wells in the process of being drilled and development projects are excluded from depletion until the related project is completed and proved reserves are established or, if unsuccessful, impairment is determined.

Proceeds from the sales of individual properties and the capitalized costs of individual properties sold or abandoned are credited and charged, respectively, to accumulated depletion, depreciation and amortization, if doing so does not materially impact the depletion rate of an amortization base. Generally, no gain or loss is recognized until an entire amortization base is sold. However, gain or loss is recognized from the sale of less than an entire amortization base if the disposition is significant enough to materially impact the depletion rate of the remaining properties in the amortization base.

The Company performs assessments of its long-lived assets to be held and used, including proved oil and gas properties accounted for under the successful efforts method of accounting, whenever events or circumstances indicate that the carrying value of those assets may not be recoverable. An impairment loss is indicated if the sum of the expected future cash flows is less than the carrying amount of the assets. In these circumstances, the Company recognizes an impairment loss for the amount by which the carrying amount of the assets exceeds the estimated fair value of the assets. See Note D for additional information regarding the Company's impairment of proved oil and gas properties.

Unproved oil and gas properties are periodically assessed for impairment on a project-by-project basis. These impairment assessments are affected by the results of exploration activities, commodity price outlooks, planned future sales or expirations of all or a portion of such projects. If the estimated future net cash flows attributable to such projects are not expected to be sufficient to fully recover the costs invested in each project, the Company will recognize an impairment loss at that time.

Goodwill

Goodwill. During 2004, the Company recorded goodwill associated with a business combination, which represents the cost of an acquired entity over the net amounts assigned to assets acquired and liabilities assumed. In accordance with GAAP, goodwill is not amortized to earnings, but is assessed for impairment whenever events or circumstances indicate that impairment of the carrying value of goodwill is likely, but no less often than annually. If the carrying value of goodwill is determined to be impaired, it is reduced for the impaired value with a corresponding charge to earnings in the period in which it is determined to be impaired. During the third quarter of 2013, the Company performed a qualitative assessment of goodwill to determine whether it was more likely than not that the fair value of the Company's reporting unit was less than its carrying amount as a basis for determining whether it was necessary to perform the two-step goodwill impairment test. Based upon the results of the assessment, the Company determined that it was not likely that the Company's goodwill was impaired.

For the year ended December 31, 2013, the Company reduced the carrying value of goodwill by $23.8 million, reflecting the portion of the Company's goodwill related to assets sold or included in assets held for sale at December 31, 2013, primarily associated with the sale of 40 percent of Pioneer's interest in 207,000 net acres leased by the Company in the horizontal Wolfcamp Shale play in the southern portion of the Spraberry field in West Texas, and the planned sales of the Company's Alaska subsidiary and Barnett Shale net assets. See Note C for additional information regarding the Company's divestitures. At December 31, 2013, the Company performed a qualitative assessment of its remaining goodwill to determine whether it is more likely than not that the fair value of the Company's reporting unit is less than its carrying amount, and the Company determined that it is not likely that the Company's remaining goodwill is impaired.

Other Property And Equipment, Net

Other property and equipment, net. Other property and equipment is recorded at cost. At December 31, 2013 and 2012, respectively, the net carrying value of other property and equipment consisted of the following:

	Year Ended December 31,
	2013 (a)		2012 (a)
	(in thousands)
Proved and unproved sand properties (b)	$	451,384	$	457,033
Equipment and rigs (c)	313,165		385,887
Land and buildings	344,554		259,629
Transportation equipment	41,397		44,928
Furniture and fixtures	47,905		43,614
Leasehold improvements	25,748		26,603
	$	1,224,153	$	1,217,694

____________________

(a) At December 31, 2013 and 2012, other property and equipment was net of accumulated depreciation of $458.4 million and $395.9 million, respectively.

(b) Includes sand mines, sales facilities and unproved leaseholds that primarily provide the Company and other unrelated customers with proppant used in the fracture stimulation of oil and gas wells.

(c) Includes drilling rigs, well servicing rigs and equipment and fracture stimulation equipment including assets owned by subsidiaries that provide drilling, pumping and well services on Company-operated properties. As of December 31, 2013, the Company owned 15 drilling rigs, eleven fracture stimulation fleets and other oilfield services equipment, including pulling units, fracture stimulation tanks, water transport trucks, hot oilers, blowout preventers, construction equipment and fishing tools. During December 2013, the Company committed to a plan to sell its majority interest in Sendero Drilling Company, LLC ("Sendero"), which owns the Company's 15 vertical drilling rigs, to Sendero's minority interest owner. Associated therewith, the Company has classified the assets and liabilities of Sendero, including $17.9 million of drilling rigs, as assets held for sale in the accompanying consolidated balance sheet as of December 31, 2013. See Note C for additional information.

The primary purposes of the Company's sand mines and drilling, pumping and well services operations are to accommodate the Company's drilling and producing operations by increasing the availability of supplies, equipment and services, rather than being dependent on third-party availability, and to contain associated costs. All intercompany gains or losses of the Company's sand mines and drilling, pumping and well services operations are eliminated.

Earnings from sales of proppant and from providing drilling, pumping and well services to third-party customers and working interest owners in Company-operated properties are included in interest and other income in the accompanying consolidated statements of operations.

The capitalized costs of proved sand properties are depleted using the unit-of-production method based on proved sand reserves. Equipment items are generally depreciated by individual component on a straight line basis over their economic useful lives, which are generally from two to 12 years. Leasehold improvements are amortized over the lesser of their economic useful lives or the underlying terms of the associated leases.

The Company evaluates other property and equipment for potential impairment whenever indicators of impairment are present. Circumstances that could indicate potential impairment include: significant adverse changes in industry trends and the economic outlook; legal actions; regulatory changes; and significant declines in utilization rates or oil and gas prices. If it is determined that other property and equipment is potentially impaired, the Company performs an impairment evaluation by estimating the future undiscounted net cash flow from the use and eventual disposition of other property and equipment grouped at the lowest level that cash flows can be identified. If the sum of the future undiscounted net cash flows is less than the net book value of the property, an impairment loss is recognized for the excess, if any, of the assets' net book value over its estimated fair value.

Investment In Unconsolidated Affiliate

Investment in unconsolidated affiliate. During 2010, the Company formed EFS Midstream LLC ("EFS Midstream") to own and operate gas and liquids gathering, treating and transportation assets in the Eagle Ford Shale play in South Texas. During June 2010, the Company sold a 49.9 percent member interest in EFS Midstream to an unaffiliated third party for $46.4 million of cash proceeds. Associated therewith, the Company recorded a $46.2 million deferred gain that is being amortized as a reduction in production costs over a 20 year period, representing the term of a continuing commitment of Pioneer to deliver production volumes through EFS Midstream handling and gathering facilities. The deferred gain is included in other current and noncurrent liabilities in the Company's accompanying consolidated balance sheet.

The Company does not have control of EFS Midstream. Consequently, the Company accounts for this investment under the equity method of accounting for investments in unconsolidated affiliates. Under the equity method, the Company's investment in unconsolidated affiliates is increased for investments made and the investor's share of the investee's net income, and decreased for distributions received, the carrying value of member interests sold and the investor's share of the investee's net losses.

The Company's equity interest in the net income or loss of EFS Midstream is recorded in interest and other income, net of eliminations of the profit associated with gathering, treating and transportation fees charged to the Company by EFS Midstream, in the accompanying consolidated statements of operations. See Note M for the Company's equity interest in the net income of EFS Midstream for the years ended December 31, 2013, 2012 and 2011.

Asset Retirement Obligations

Asset retirement obligations. The Company records a liability for the fair value of an asset retirement obligation in the period in which it is incurred if a reasonable estimate of fair value can be made. Asset retirement obligations are generally capitalized as part of the carrying value of the long-lived asset to which it relates. Conditional asset retirement obligations meet the definition of liabilities and are recognized when incurred if their fair values can be reasonably estimated.

The Company records the current and noncurrent portions of asset retirement obligations in other current liabilities and other liabilities, respectively, in the accompanying consolidated balance sheets and expenditures are classified as cash used in operating activities in the accompanying consolidated statements of cash flows. See Note I for additional information about the Company's asset retirement obligations.

Treasury Stock

Treasury stock. Treasury stock purchases are recorded at cost. Upon reissuance, the cost of treasury shares held is reduced by the average purchase price per share of the aggregate treasury shares held.

Noncontrolling Interest In Consolidated Subsidiaries

Noncontrolling interest in consolidated subsidiaries. The Company owns the majority interests in certain subsidiaries with operations in the United States. Prior to December 17, 2013, the Company owned a 0.1 percent general partner interest and a 52.4 percent limited partner interest in Pioneer Southwest Energy Partners L.P. ("Pioneer Southwest") and consolidated the financial position, results of operations and cash flows of Pioneer Southwest with those of Pioneer. Pioneer Southwest owned proved and unproved oil and gas properties in the Spraberry field in the Permian Basin of West Texas. On December 17, 2013, the holders of a majority of the outstanding common units of Pioneer Southwest approved an amended agreement and plan of merger, pursuant to which (i) all of the then outstanding common units of Pioneer Southwest were canceled and converted into the right to receive 0.2325 of a share of common stock of the Company and (ii) Pioneer Southwest became a wholly-owned subsidiary of the Company. The changes in the Company's ownership of Pioneer Southwest were accounted for by eliminating the noncontrolling interest attributable to Pioneer Southwest. See Note C for additional information about Pioneer Southwest and the amended agreement and plan of merger.

Noncontrolling interests in the net assets of consolidated subsidiaries totaled $13.2 million and $178.0 million as of December 31, 2013 and 2012, respectively. The Company recorded net income attributable to the noncontrolling interests of $38.9 million, $50.5 million and $47.4 million for the years ended December 31, 2013, 2012 and 2011, respectively.

In accordance with GAAP, the Company records transfers of any gains or losses, net of taxes, from noncontrolling interests in consolidated subsidiaries to additional paid in capital proportionate to the ownership after giving effect to the purchase or sale of common units. The following table presents the Company's net income or loss attributable to common stockholders adjusted for changes in equity as a result of transactions that changed the Company's ownership interest in Pioneer Southwest:

	Year Ended December 31,
	2013			2012			2011
	(in thousands)
Net income (loss) attributable to common stockholders	$	(838,414	)	$	192,285		$	834,489
Transfers from the noncontrolling interest in consolidated subsidiaries:
Increase in additional paid in capital from the sale of 1.8 million Pioneer Southwest common units during 2011, net of tax of $15.4 million	—			—			26,915
Increase in additional paid in capital from Pioneer Southwest's offering of 2.6 million common units during 2011, net of tax of $23.7 million	—			—			8,104
Decrease in additional paid in capital for deferred taxes recognized attributable to Pioneer Southwest's 2008 initial public offering of 9.5 million common units	—			(49,072		)	—
Increase in additional paid in capital from Pioneer Southwest merger	168,685			—			—
Increase in additional paid in capital from deferred taxes recognized attributable to Pioneer Southwest merger	200,091			—			—
Decrease in additional paid in capital from Pioneer Southwest merger transaction costs	(3,880		)	—			—
Net increase (decrease) in equity from transactions with noncontrolling interests	364,896			(49,072		)	35,019
Net income (loss) attributable to common stockholders and changes in equity from transactions with noncontrolling interests	$	(473,518	)	$	143,213		$	869,508

Revenue Recognition

Revenue recognition. The Company recognizes revenue when it is realized or realizable and earned. Revenues are considered realized or realizable and earned when: (i) persuasive evidence of an arrangement exists, (ii) delivery has occurred or services have been rendered, (iii) the seller's price to the buyer is fixed or determinable and (iv) collectability is reasonably assured.

The Company uses the entitlements method of accounting for oil, NGLs and gas revenues. Sales proceeds in excess of the Company's entitlement are included in other liabilities and the Company's share of sales taken by others is included in other assets in the accompanying consolidated balance sheets.

The Company had no material oil or NGL entitlement assets or liabilities as of December 31, 2013 or 2012. The following table presents the Company's gas entitlement assets and liabilities with their associated volumes as of December 31, 2013 and 2012. Gas volumes are presented in millions of cubic feet ("MMCF").

	December 31,
	2013			2012
	Amount		Volume	Amount		Volume
	(dollars in millions)
Gas entitlement assets	$	7.4	2,990	$	6.8	2,870
Gas entitlement liabilities	$	2.5	715	$	1.9	582

The Company enters into oil and gas purchase transactions with third parties and separate sale transactions with third parties to satisfy unused pipeline capacity commitments and to diversify a portion of the Company's WTI oil sales to a Gulf Coast oil price.  Revenues and expenses from these transactions are presented on a gross basis as the Company acts as a principal in the transaction by assuming the risk and rewards of ownership, including credit risk, of the oil and gas purchased and assuming responsibility to deliver the oil and gas volumes sold. Deficiency payments on excess pipeline capacity are included in other expense in the accompanying consolidated statements of operations. See Note N for further information on transportation commitment charges.

The Company recognized revenue of $42.1 million and $45.0 million during 2012 and 2011, respectively from volumetric production payment ("VPP") agreements which represented limited-term overriding royalty interests in oil reserves that: (i) entitled the purchaser to receive production volumes over a period of time from specific lease interests, (ii) were free and clear of all associated production costs and capital expenditures associated with the reserves, (iii) were nonrecourse to the Company (i.e., the purchaser's only recourse was to the reserves acquired), (iv) transferred title of the reserves to the purchaser and (v) allowed the Company to retain the remaining reserves after the VPPs volumetric quantities had been delivered. The Company had no VPP obligations in 2013 as all VPP production volumes were delivered as of December 31, 2012; as such, the Company recognized no VPP revenue in 2013.

Derivatives And Hedging

Derivatives. All derivatives are recorded in the accompanying consolidated balance sheets at estimated fair value. Effective February 1, 2009, the Company discontinued hedge accounting on all of its then-existing hedge contracts. The effective portions of the discontinued deferred hedges as of February 1, 2009 were included in accumulated other comprehensive income (loss) ("AOCI - Hedging") and were transferred to earnings during the same periods in which the forecasted hedged transactions were recognized in the Company's earnings. During 2012, the remaining AOCI - Hedging losses were transferred to earnings. Since discontinuing hedge accounting, the Company has recognized all changes in the fair values of its derivative contracts as gains or losses in the earnings of the periods in which they occur.

The Company classifies the fair value amounts of derivative assets and liabilities executed under master netting arrangements as net current or noncurrent derivative assets or net current or noncurrent derivative liabilities, whichever the case may be, by commodity and counterparty. Net derivative asset values are determined, in part, by utilization of the derivative counterparties' credit-adjusted risk-free rate curves and net derivative liabilities are determined, in part, by utilization of the Company's and, through the date of the merger, Pioneer Southwest's credit-adjusted risk-free rate curves. The credit-adjusted risk-free rate curves for the Company and the counterparties are based on their independent market-quoted credit default swap rate curves plus the United States Treasury Bill yield curve as of the valuation date. Pioneer Southwest's credit-adjusted risk-free rate curve was based on independent market-quoted forward London Interbank Offered Rate ("LIBOR") curves plus 162.5 basis points, representing Pioneer Southwest's estimated borrowing rate. See Note E for additional information about the Company's derivative instruments.

Environmental

Environmental. The Company's environmental expenditures are expensed or capitalized depending on their future economic benefit. Expenditures that relate to an existing condition caused by past operations and that have no future economic benefits are expensed. Expenditures that extend the life of the related property or mitigate or prevent future environmental contamination are capitalized. Liabilities for expenditures that will not qualify for capitalization are recorded when environmental assessment and/or remediation is probable and the costs can be reasonably estimated. Such liabilities are undiscounted unless the timing of cash payments for the liability is fixed or reliably determinable. Environmental liabilities normally involve estimates that are subject to revision until settlement occurs.

Stock-Based Compensation

Stock-based compensation. For stock-based compensation awards granted or modified, stock-based compensation expense is being recognized in the Company's financial statements on a straight line basis over the awards' vesting periods based on their fair values on the dates of grant or modification, as applicable. The stock-based compensation awards generally vest over a period not exceeding three years. The amount of stock-based compensation expense recognized at any date is approximately equal to the ratable portion of the grant date value of the award that is vested at that date. The Company utilizes (i) the Black-Scholes option pricing model to measure the fair value of stock options, (ii) the prior day's closing stock price on the date of grant for the fair value of restricted stock, restricted stock units, partnership unit awards or phantom unit awards that are expected to be settled in the Company's common stock ("Equity Awards"), (iii) the Monte Carlo simulation method for the fair value of performance unit awards and (iv) a probabilistic forecasted fair value method for Series B unit awards issued by Sendero.

Stock-based compensation liability awards are awards that are expected to be settled in cash on their vesting dates, rather than in equity shares or units ("Liability Awards"). Stock-based Liability Awards are recorded as accounts payable—affiliates based on the vested portion of the fair value of the awards on the balance sheet date. The fair values of Liability Awards are updated at each balance sheet date and changes in the fair values of the vested portions of the awards are recorded as increases or decreases to stock-based compensation expense.

Segment Reporting

Segments. Operating segments are defined as components of an enterprise that (i) engage in activities from which it may earn revenues and incur expenses (ii) for which separate operational financial information is available and is regularly evaluated by the chief operating decision maker for the purpose of allocating resources and assessing performance.

Based upon how the Company is organized and managed, the Company has only one reportable operating segment, which is oil and gas exploration and production. The Company considers its vertical integration services as ancillary to its oil and gas exploration and producing activities and manages these services to support such activities. In addition, the Company has a single, company-wide management team that allocates capital resources to maximize profitability and measures financial performance as a single enterprise.

Assets Held for Sale and Discontinued Operations

Assets held for sale and discontinued operations. On the date at which the Company meets all the held for sale criteria, the Company discontinues the recording of depletion and depreciation of the assets or asset group to be sold and reclassifies the assets and related liabilities to be sold as held for sale on the accompanying consolidated balance sheets. The assets and liabilities are measured at the lower of their carrying amount or estimated fair value less cost to sell.

In addition, after determining that held for sale criteria has been met, the Company considers whether the held for sale assets meet the criteria to be considered discontinued operations. If the assets held for sale are considered discontinued operations, the Company classifies the results of operations from the assets held for sale as income or loss from discontinued operations, net of tax in the accompanying consolidated statements of operations for the current period and all prior periods. See Note C for additional information about the Company's divestitures.

New Accounting Pronouncements

New accounting pronouncements. In July 2013, the Financial Accounting Standards Boards issued Accounting Standards Update ("ASU") 2013-11, "Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists," which provides guidance on the presentation of unrecognized tax benefits. The adoption of ASU 2013-11 during the third quarter of 2013 did not have a material impact on the Company's financial position and had no impact on the Company's statements of operations or cash flows.

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Acquisitions and Divestitures (Discontinued Operations Balance Sheet) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Discontinued Operations Balance Sheet Held For Sale [Abstract]
Assets of Disposal Group, Including Discontinued Operation, Current	$ 57,602
Disposal Group, Including Discontinued Operation, Property, Plant, and Equipment, Net	526,148
Assets held for sale	583,750	0
Liabilities of Disposal Group, Including Discontinued Operation, Current	28,771
Disposal Group, Including Discontinued Operation, Other Liabilities	9,791
Liabilities held for sale	$ 38,562	$ 0

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Summary Of Significant Accounting Policies (Narrative) (Details) (USD $)	12 Months Ended					12 Months Ended		12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Pioneer Southwest [Member]	Dec. 17, 2013 Pioneer Southwest [Member]	Dec. 31, 2010 EFS Midstream [Member]	Jun. 30, 2010 EFS Midstream [Member] Rate	Dec. 31, 2013 Wolfcamp [Member] Rate	Dec. 17, 2013 Limited Partner Interest [Member] Rate	Dec. 17, 2013 General Partner Interest [Member] Rate
Summary Of Significant Accounting Policies [Line Items]
Accounts receivable - trade	$ 430,732,000	$ 316,854,000
Allowances for doubtful accounts	1,400,000	1,500,000
Natural gas processing plants number	6
Treating facilities number	9
Operational natural gas processing plants	2
Operational treating facilities	9
Third party revenues, processing plants and treating facilities	57,200,000	34,400,000	42,600,000
Third party expenses, processing plants and treating facilities	30,100,000	26,500,000	22,600,000
Goodwill, Written off Related to Sale of Business Unit	23,800,000
Joint Venture Investment Ownership Percentage								40.00%
Percentage of interest sold							49.90%
Proceeds from sale of interest in EFS Midstream						46,400,000
Deferred gain on sale of EFS midstream						46,200,000
EFS midstream deferred gain amortization period, years						20
Stock Issued During Period, Shares, New Issues	10,350,000		5,500,000
Proceeds from issuance of common stock, net of issuance	1,280,916,000	0	484,160,000
Partnerships interest									52.40%	0.10%
Share Per Unit Exchange Ratio					0.2325
Noncontrolling interest in consolidating subsidiaries	13,174,000	177,954,000
Net income attributable to noncontrolling interests	(38,865,000)	(50,537,000)	(47,425,000)
Deferred Revenue, Revenue Recognized		$ 42,100,000	$ 45,000,000
Basis points added to variable interest rate				162.5

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Incentive Plans (Schedule Of Performance Unit Activity) (Details) (USD $)			12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Performance Units [Member] Rate
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares/Units, Outstanding at beginning of year			91,370	[1]
Number of Units granted			94,917	[1]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period			(10,842)	[1]
Awards vested			(40,969)	[1]
Number of Shares/Units, Outstanding at end of year			134,476	[1]
Weighted Average Grant-Date Fair Value, Outstanding at beginning of year			$ 154.53
Weighted Average Grant-Date Fair Value, Units granted			$ 189.23
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value			$ 172.02
Weighted Average Grant Date Fair Value, Units vested			$ 134.68	[2]
Weighted Average Grant-Date Fair Value, Outstanding at end of year			$ 183.66
Performance percentage of actual payout minimum			0.00%
Performance percentage to reach maximum			250.00%
Number of shares earned for each vested award			2.5
Common stock, shares issued	145,833,707	134,966,740	102,424

[1] (a)These amounts reflect the number of performance units granted. The actual payout of shares may be between zero percent and 250 percent of the performance units granted depending upon the total shareholder return ranking of the Company compared to peer companies at the vesting date.

[2] (b)On December 31, 2013, the service period lapsed on 40,969 of these performance unit awards. The lapsed units earned 2.5 shares for each vested award representing 102,424 aggregate shares of common stock issued on January 2, 2014.

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Major Customers (Tables)

12 Months Ended

Dec. 31, 2013

Major Customers And Derivative Counterparties [Abstract]

Consolidated Oil, NGL And Gas Revenues

The following purchasers individually accounted for ten percent or more of the Company's consolidated oil, NGL and gas revenues, including the revenues from discontinued operations, in at least one of the three years ended December 31, 2013:

	Year Ended December 31,
	2013		2012		2011
Plains Marketing LP	26	%	25	%	16	%
Enterprise Products Partners L.P.	12	%	14	%	12	%
Occidental Energy Marketing Inc	12	%	13	%	14	%

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Disclosures About Fair Value Measurements (Assets And Liabilities That Are Measured At Fair Value On A Recurring Basis) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities, Fair Value Disclosure	$ 282	$ 278
Derivative Asset, Fair Value, Amount Not Offset Against Collateral		334,376
Deferred Compensation Plan Assets	63,971	49,685
Assets, Fair Value Disclosure	230,344	384,339
Liabilities, Fair Value Disclosure	21,559	25,723
Recurring Measurements, (Fair Value, Total)	208,785	358,616
Commodity Derivatives [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	156,561
Derivative Financial Instruments, Liabilities, Fair Value Disclosure	11,626	15,999
Interest Rate Derivatives [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	9,530
Derivative Financial Instruments, Liabilities, Fair Value Disclosure	9,933	9,724
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities, Fair Value Disclosure	136	124
Derivative Asset, Fair Value, Amount Not Offset Against Collateral		0
Deferred Compensation Plan Assets	63,971	49,685
Assets, Fair Value Disclosure	64,107	49,809
Liabilities, Fair Value Disclosure	0	0
Recurring Measurements, (Fair Value, Total)	64,107	49,809
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Commodity Derivatives [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	0
Derivative Financial Instruments, Liabilities, Fair Value Disclosure	0	0
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Interest Rate Derivatives [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	0
Derivative Financial Instruments, Liabilities, Fair Value Disclosure	0	0
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities, Fair Value Disclosure	146	154
Derivative Asset, Fair Value, Amount Not Offset Against Collateral		334,376
Deferred Compensation Plan Assets	0	0
Assets, Fair Value Disclosure	166,237	334,530
Liabilities, Fair Value Disclosure	21,559	25,723
Recurring Measurements, (Fair Value, Total)	144,678	308,807
Significant Other Observable Inputs (Level 2) [Member] | Commodity Derivatives [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	156,561
Derivative Financial Instruments, Liabilities, Fair Value Disclosure	11,626	15,999
Significant Other Observable Inputs (Level 2) [Member] | Interest Rate Derivatives [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	9,530
Derivative Financial Instruments, Liabilities, Fair Value Disclosure	9,933	9,724
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities, Fair Value Disclosure	0	0
Derivative Asset, Fair Value, Amount Not Offset Against Collateral		0
Deferred Compensation Plan Assets	0	0
Assets, Fair Value Disclosure	0	0
Liabilities, Fair Value Disclosure	0	0
Recurring Measurements, (Fair Value, Total)	0	0
Significant Unobservable Inputs (Level 3) [Member] | Commodity Derivatives [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	0
Derivative Financial Instruments, Liabilities, Fair Value Disclosure	0	0
Significant Unobservable Inputs (Level 3) [Member] | Interest Rate Derivatives [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	0
Derivative Financial Instruments, Liabilities, Fair Value Disclosure	$ 0	$ 0

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Long-Term Debt (Interest Expenses) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Cash payments for interest	$ 182,126		$ 168,665		$ 165,251
Accretion/amortization of discounts or premiums on loans	11,423		27,351		25,210
Amortization of net deferred hedge losses (see Note I)	349	[1]	2,018	[1]	573	[1]
Accretion of discount on postretirement benefit obligations	193		257		315
Amortization of capitalized loan fees	5,260		5,937		5,385
Net changes in accruals	(5,709)		10,842		(1,768)
Interest incurred	193,642		215,070		194,966
Less capitalized interest	(9,892)		(10,848)		(13,362)
Interest	183,750		204,222		181,604
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, before Tax	0		(4,855)		32,636
Interest Rate Derivatives [Member]
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, before Tax			$ (1,700)		$ (282)

[1] Includes interest rate derivative hedges of $1.7 million and $282 thousand for the periods ended December 31, 2012 and 2011, respectively, that were reclassified from AOCI - Hedging into earnings upon expiration (see Note E).

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Schedule of Derivative Assets and Liabilities by Counterparty (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013
Schedule of Derivative Assets and Liabilities by Counterparty [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	$ 144,532
JP Morgan Chase [Member]
Schedule of Derivative Assets and Liabilities by Counterparty [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	46,908
Morgan Stanley [Member]
Schedule of Derivative Assets and Liabilities by Counterparty [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	17,411
Merrill Lynch [Member]
Schedule of Derivative Assets and Liabilities by Counterparty [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	16,979
Barclays Capital [Member]
Schedule of Derivative Assets and Liabilities by Counterparty [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	16,923
Den Norske Bank [Member]
Schedule of Derivative Assets and Liabilities by Counterparty [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	8,928
Societe Generale [Member]
Schedule of Derivative Assets and Liabilities by Counterparty [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	8,754
Macquarie Bank [Member]
Schedule of Derivative Assets and Liabilities by Counterparty [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	8,146
J. Aron & Company [Member]
Schedule of Derivative Assets and Liabilities by Counterparty [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	6,817
Wells Fargo Bank, N.A. [Member]
Schedule of Derivative Assets and Liabilities by Counterparty [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	4,969
Citibank N [Member]
Schedule of Derivative Assets and Liabilities by Counterparty [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	4,857
Deutsche Bank [Member]
Schedule of Derivative Assets and Liabilities by Counterparty [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	1,374
BMO Financial Group [Member]
Schedule of Derivative Assets and Liabilities by Counterparty [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	1,041
Credit Suisse [Member]
Schedule of Derivative Assets and Liabilities by Counterparty [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	992
BP Corporation North America [Member]
Schedule of Derivative Assets and Liabilities by Counterparty [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	793
Royal Bank of Canada [Member]
Schedule of Derivative Assets and Liabilities by Counterparty [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	752
BNP Paribas [Member]
Schedule of Derivative Assets and Liabilities by Counterparty [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	473
Toronto Dominion [Member]
Schedule of Derivative Assets and Liabilities by Counterparty [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	(476)
Mitsubishi UFJ Financial Group [Member]
Schedule of Derivative Assets and Liabilities by Counterparty [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	(504)
Credit Agricole [Member]
Schedule of Derivative Assets and Liabilities by Counterparty [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	$ (605)

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Summary Of Significant Accounting Policies (Oil Entitlement Assets and Liabilities) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013 Mcf	Dec. 31, 2012 Mcf
Oil Entitlement Assets and Liabilities [Line Items]
Gas Entitlement Assets Amount	$ 7.4	$ 6.8
Gas Entitlement Assets Volumes In Mmcf	2,990	2,870
Gas Entitlement Liabilities Amount	$ 2.5	$ 1.9
Gas Entitlement Liabilities Volumes In Mmcf	715	582

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Organization And Nature Of Operations

12 Months Ended

Dec. 31, 2013

Organization And Nature Of Operations [Abstract]

Organization And Nature Of Operations

NOTE A.    Organization and Nature of Operations

Pioneer Natural Resources Company ("Pioneer" or "the Company") is a Delaware corporation whose common stock is listed and traded on the New York Stock Exchange. The Company is a large independent oil and gas exploration and production company in the United States, with continuing field operations in the Permian Basin in West Texas, the Eagle Ford Shale play in South Texas, the Raton field in southeastern Colorado, the Hugoton field in southwest Kansas and the West Panhandle field in the Texas Panhandle. The Company's objective is to maximize shareholder investment returns by maintaining financial flexibility, capital allocation discipline and enhancing net asset value through accretive drilling programs, joint ventures and acquisitions.

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Exploratory Well Costs (Capitalized Exploratory Well And Project Activity) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Increase (Decrease) in Capitalized Exploratory Well Costs that are Pending Determination of Proved Reserves [Roll Forward]
Capitalized Exploratory Well Costs, Beginning Balance	$ 212,670	[1]	$ 107,596	[1]	$ 96,193
Capitalized Exploratory Well Cost, Additions Pending Determination of Proved Reserves	1,219,797		926,084		524,313
Reclassification due to determination of proved reserves	(1,044,815)		(790,373)		(480,716)
Capitalized Exploratory Well Cost Assets Disposition	(92,855)		0		(28,938)
Impairment of oil and gas properties	1,495,242		0		354,408
Exploratory well costs charged to exploration expense	(49,134)	[2]	(30,637)	[2]	(3,256)	[2]
Capitalized Exploratory Well Costs, Ending Balance	158,902	[1]	212,670	[1]	107,596	[1]
Exploration Abandonment and Impairment Expense	98,448		98,285		80,691
Disposal Group, Including Discontinued Operation, Property, Plant, and Equipment, Net	526,148
Discontinued Operations [Member]
Increase (Decrease) in Capitalized Exploratory Well Costs that are Pending Determination of Proved Reserves [Roll Forward]
Impairment of oil and gas properties	729,305	[3]	532,589	[3]	0	[3]
Exploration Abandonment and Impairment Expense	52,707		108,076		44,898
Capitalized exploratory costs [Member]
Increase (Decrease) in Capitalized Exploratory Well Costs that are Pending Determination of Proved Reserves [Roll Forward]
Impairment of oil and gas properties	(86,761)		0		0
Disposal Group, Including Discontinued Operation, Property, Plant, and Equipment, Net	60,300
Capitalized exploratory costs [Member] | Discontinued Operations [Member]
Increase (Decrease) in Capitalized Exploratory Well Costs that are Pending Determination of Proved Reserves [Roll Forward]
Exploration Abandonment and Impairment Expense	$ 43,300		$ 21,600		$ 180

[1] Includes $60.3 million of capitalized exploratory well costs classified as held for sale in the accompanying consolidated balance sheet as of December 31, 2013.

[2] Includes exploration and abandonment expense reclassified as discontinued operations of $43.3 million, $21.6 million, and $180 thousand in 2013, 2012 and 2011, respectively.

[3] (c)Represents a noncash impairment charge of $539.8 million on Pioneer Alaska net assets during the year ended December 31, 2013 and noncash impairment charges of $189.5 million and $532.6 million during the years ended December 31, 2013 and 2012, respectively, on the Company's net assets in the Barnett Shale field. See Note D for additional information regarding the noncash impairment charges.

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Summary of Significant Accounting Policies (Revision for Purchased Oil and Gas) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Sales of purchased oil and gas	$ 333,822	$ 122,093	$ 14,542
Purchased oil and gas	335,734	120,408	13,949
Other	137,386	114,175	63,071
Scenario, Previously Reported [Member]
Sales of purchased oil and gas		0	0
Financial Information, Charges and Credits, Amount Reconciling to Previously Reported Results		0	0
Other		112,490	62,478
Increase in Sales of Purchased Oil and Gas, Revision of Sales of Purchased Oil and Gas [Member] | Restatement Adjustment [Member]
Quantifying Revision in Current Year Financial Statements, Revenue Amount		122,093	14,542
Increase in Costs of Purchased Oil and Gas, Revisions of Purchased Oil and Gas [Member] | Restatement Adjustment [Member]
Quantifying Revision in Current Year Financial Statements, Expense Amount		120,408	13,949
Increase in Other Expense, Revision of Purchased Oil and Gas [Member] | Restatement Adjustment [Member]
Quantifying Revision in Current Year Financial Statements, Expense Amount		$ 1,685	$ 593

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Disclosures About Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2013

Fair Value Disclosures [Abstract]

Assets And Liabilities That Are Measured At Fair Value On A Recurring Basis

The following tables present the Company's assets and liabilities that are measured at fair value on a recurring basis as of December 31, 2013 and 2012 for each of the fair value hierarchy levels:

	Fair Value Measurements at the End of the Reporting Period Using
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Fair Value at December 31, 2013
	(in thousands)
Assets:
Trading securities	$	136	$	146	$	—	$	282
Commodity derivatives	—		156,561		—		156,561
Interest rate derivatives	—		9,530		—		9,530
Deferred compensation plan assets	63,971		—		—		63,971
Total assets	64,107		166,237		—		230,344
Liabilities:
Commodity derivatives	—		11,626		—		11,626
Interest rate derivatives	—		9,933		—		9,933
Total liabilities	—		21,559		—		21,559
Total recurring fair value measurements	$	64,107	$	144,678	$	—	$	208,785

	Fair Value Measurements at the End of the Reporting Period Using
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Fair Value at December 31, 2012
	(in thousands)
Assets:
Trading securities	$	124	$	154	$	—	$	278
Commodity derivatives	—		334,376		—		334,376
Deferred compensation plan assets	49,685		—		—		49,685
Total assets	49,809		334,530		—		384,339
Liabilities:
Commodity derivatives	—		15,999		—		15,999
Interest rate derivatives	—		9,724		—		9,724
Total liabilities	—		25,723		—		25,723
Total recurring fair value measurements	$	49,809	$	308,807	$	—	$	358,616

Fair Value Measurements, Nonrecurring [Table Text Block]

The following table presents the fair value and fair value adjustments (in millions) for the Company's 2013, 2012 and 2011 proved property impairments, as well as the average oil price per barrel ("BBL") and gas price per British thermal unit ("MMBTU") utilized in respective Management's Price Outlooks:

	Year ended	Fair		Fair Value			Management's Price Outlooks
	December 31,	Value		Adjustment			Oil		Gas
Edwards Trend/Austin Chalk	2011	$	189.9	$	(354.4	)	$	92.69	$	5.14
Barnett Shale	2012	$	184.8	$	(532.6	)	$	87.09	$	4.78
Raton	2013	$	533.6	$	(1,495.2	)	$	80.40	$	4.43

Fair Value of Assets Classified as Held for Sale [Table Text Block]

The following table presents the estimated fair value less costs to sell and fair value adjustments for the Company's assets classified as held for sale as of December 31, 2013:

	Estimated Fair Value Less Costs to Sell		Fair Value Adjustment
	(in millions)
Discontinued operations held for sale - Alaska	$	350.6	$	(539.8	)
Discontinued operations held for sale - Barnett Shale field	$	180.4	$	(189.5	)
Other long-lived assets held for sale - Sendero	$	31.4	$	(25.5	)

Fair Value Measurements Not Carried At Fair Value

Carrying values and fair values of financial instruments that are not carried at fair value in the consolidated balance sheet as of December 31, 2013 and 2012 are as follows:

	December 31, 2013				December 31, 2012
	Carrying Value		Fair Value		Carrying Value		Fair Value
	(in thousands)
Long-term debt	$	2,653,059	$	3,018,830	$	3,721,193	$	4,555,770

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Acquisitions and Divestitures Acquisitions and Divestitures (Tables)

12 Months Ended

Dec. 31, 2013

Acquisitions and Divestitures [Abstract]

Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures [Table Text Block]

The following table represents the components of the Company's discontinued operations for the years ended December 31, 2013, 2012 and 2011:

	Year Ended December 31,
	2013			2012			2011
	(in thousands)
Revenues and other income:
Oil and gas	$	260,503		$	285,542		$	314,124
Interest and other (a)	38,642			29,437			45,145
Gain on disposition of assets, net (b)	8,764			40,735			645,241
	307,909			355,714			1,004,510
Costs and expenses:
Oil and gas production	90,333			79,853			55,698
Production and ad valorem taxes	10,151			9,034			8,239
Depletion, depreciation and amortization (b)	103,787			101,921			130,606
Impairment of oil and gas properties (b) (c)	729,305			532,589			—
Exploration and abandonments	52,707			108,076			44,898
General and administrative	12,261			6,061			13,517
Accretion of discount on asset retirement obligations (b)	831			2,731			3,436
Interest	—			—			829
Other	9,021			2,096			5,849
	1,008,396			842,361			263,072
Income (loss) from discontinued operations before income taxes	(700,487		)	(486,647		)	741,438
Current tax provision	(5,591		)	(10,387		)	(46,012		)
Deferred tax (provision) benefit (b)	256,473			192,824			(221,302		)
Income (loss) from discontinued operations	$	(449,605	)	$	(304,210	)	$	474,124

 ____________________

(a) Primarily comprised of Alaskan Petroleum Production Tax credits on qualifying capital expenditures of $38.6 million, $29.3 million and $38.9 million for the years ended December 31, 2013, 2012 and 2011, respectively.

(b) Represents significant noncash components of discontinued operations.

(c) Represents a noncash impairment charge of $539.8 million on Pioneer Alaska net assets during the year ended December 31, 2013 and noncash impairment charges of $189.5 million and $532.6 million during the years ended December 31, 2013 and 2012, respectively, on the Company's net assets in the Barnett Shale field. See Note D for additional information regarding the noncash impairment charges.

Discontinued Operations Assets and Liabilities Included in Assets and Liabilities Held for Sale [Table Text Block]

As of December 31, 2013, the carrying values of the Company's ownership in Pioneer Alaska, the Barnett Shale field and Sendero were included in assets and liabilities held for sale in the accompanying consolidated balance sheet and were comprised of the following (the Company had no assets held for sale as of December 31, 2012):

	December 31, 2013
	(in thousands)
Composition of assets included in assets held for sale:
Current assets (excluding cash and cash equivalents)	$	57,602
Property, plant and equipment	526,148
Total assets	$	583,750
Composition of liabilities included in liabilities held for sale:
Current liabilities	$	28,771
Other liabilities	9,791
Total liabilities	$	38,562

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Derivative Financial Instruments (Narrative) (Details) (USD $)	3 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2013 Rollfactor Swap Contracts [Member]	Feb. 20, 2014 Oil contracts [Member] Rollfactor Swap Contracts for March Through December 2014 [Member]	Feb. 20, 2014 Oil contracts [Member] Rollfactor Swap Contracts for Year 2 [Member]	Dec. 31, 2013 Oil contracts [Member] Collar Contracts With Short Puts for Next Twelve Months [Member]	Feb. 20, 2014 Oil contracts, price per bbl [Member] Rollfactor Swap Contracts for March Through December 2014 [Member]	Feb. 20, 2014 Oil contracts, price per bbl [Member] Rollfactor Swap Contracts for Year 2 [Member]	Dec. 31, 2013 Oil contracts, price per bbl [Member] Collar Contracts With Short Puts for Next Twelve Months [Member]	Dec. 31, 2013 Oil contracts, price per bbl [Member] Collar Contracts With Short Puts for Next Twelve Months [Member] Short Put [Member]	Dec. 31, 2013 NGL contract, in BBLS [Member] Collar Contracts With Short Puts for Next Twelve Months [Member]	Dec. 31, 2013 NGL contract, in BBLS [Member] Collar Contracts for Next Twelve Months [Member]	Feb. 20, 2014 NGL contract, in BBLS [Member] Swap Contracts for March Through December 2014 [Member]	Feb. 20, 2014 NGL contract, in BBLS [Member] Swap Contracts for April Through October 2014 [Member]	Dec. 31, 2013 NGL contracts, price per BBL [Member] Collar Contracts With Short Puts for Next Twelve Months [Member]	Dec. 31, 2013 NGL contracts, price per BBL [Member] Collar Contracts With Short Puts for Next Twelve Months [Member] Short Put [Member]	Dec. 31, 2013 NGL contracts, price per BBL [Member] Collar Contracts for Next Twelve Months [Member]	Feb. 20, 2014 NGL contracts, price per BBL [Member] Swap Contracts for March Through December 2014 [Member]	Feb. 20, 2014 NGL contracts, price per BBL [Member] Swap Contracts for April Through October 2014 [Member]	Dec. 31, 2013 Gas contracts, in MMBTU [Member] Collar Contracts With Short Puts for Next Twelve Months [Member]	Feb. 20, 2014 Gas contracts, in MMBTU [Member] Basis Swap Contracts for April Through December 2014 [Member]	Dec. 31, 2013 Gas contracts, price per MMBTU [Member] Collar Contracts With Short Puts for Next Twelve Months [Member]	Dec. 31, 2013 Gas contracts, price per MMBTU [Member] Collar Contracts With Short Puts for Next Twelve Months [Member] Short Put [Member]	Feb. 20, 2014 Gas contracts, price per MMBTU [Member] Basis Swap Contracts for April Through December 2014 [Member]	Feb. 20, 2014 Basis Index Swaps [Member] Basis Swap Contracts for March 2014 [Member]	Feb. 20, 2014 Basis Index Swaps [Member] Basis Swap Contracts for April Through October 2014 [Member]	Feb. 20, 2014 Basis Index Swaps [Member] Basis Swap Contracts for April Through December 2014 [Member]	Feb. 20, 2014 Basis Index Swap contracts, price per MMBTU [Member] Basis Swap Contracts for March 2014 [Member]	Feb. 20, 2014 Basis Index Swap contracts, price per MMBTU [Member] Basis Swap Contracts for April Through October 2014 [Member]	Feb. 20, 2014 Basis Index Swap contracts, price per MMBTU [Member] Basis Swap Contracts for April Through December 2014 [Member]	Dec. 31, 2013 July 15, 2022 Interest Rate Swaps [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Derivative, Nonmonetary Notional Amount			5,000	5,000	69,000					1,000	3,000	1,000	2,000						115,000	35,000				20,000	10,000	30,000
Derivative, Swap Type, Average Fixed Price																							(0.27)
Derivative, Average Cap Price								114.05						109.50		13.72					4.70
Derivative, Average Floor Price								93.70						95.00							4.00
Derivative, Notional Amount, Price Per Unit						0.82	0.60		77.61						80.00	10.78	47.57	48.51				3.00
Swap Multiple Second Nearby Month		0.6667
Swap Multiple Third Nearby Month		0.3333
Average Daily Index Swaps Price Differential																											0.34	0.36	0.30
Derivative fixed interest rate	3.21%																													3.95%
Derivative fixed interest rate term, years	10
Notional amount of debt	$ 250,000,000																													$ 400,000,000
Proceeds from Termination of Interest Rate Derivatives	$ 482,000
Derivative, Variable Interest Rate																														1.11%

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Summary Of Significant Accounting Policies (Schedule of Inventory) (Details) (USD $)	Dec. 31, 2013		Dec. 31, 2012
Schedule of Inventory [Line Items]
Materials and supplies inventories	$ 210,792,000	[1]	$ 258,962,000	[1]
Commodities	13,429,000		5,446,000
Inventory, Drilling, Noncurrent	(4,096,000)	[2]	(67,352,000)	[2]
Inventories	220,125,000		197,056,000
Net materials and supplies inventories reserves	$ 31,800,000		$ 4,600,000

[1] (a)As of December 31, 2013 and 2012, the Company's materials and supplies inventories were net of valuation reserve allowances of $31.8 million and $4.6 million, respectively. See Note D for additional information regarding inventory impairments.

[2] (b)Included in other noncurrent assets in the Company's accompanying consolidated balance sheet.

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Derivative Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2013

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Oil Derivative Contracts Volume And Weighted Average Price

The following table sets forth the volumes per day in BBLs associated with the Company's outstanding oil derivative contracts as of December 31, 2013 and the weighted average oil prices per BBL for those contracts:

	2014		2015		2016
Swap contracts:
Volume (BBLs)	10,000		—		—
Average price per BBL	$	93.87	$	—	$	—
Collar contracts with short puts:
Volume (BBLs)	69,000		85,000		25,000
Average price per BBL:
Ceiling	$	114.05	$	98.98	$	93.30
Floor	$	93.70	$	88.06	$	85.00
Short put	$	77.61	$	73.06	$	70.00

Gas Volume And Weighted Average Price

The following table sets forth the volumes per day in MMBTUs associated with the Company's outstanding gas derivative contracts as of December 31, 2013 and the weighted average gas prices per MMBTU for those contracts:

	2014			2015			2016
Swap contracts:
Volume (MMBTUs)	195,000			20,000			—
Price per MMBTU	$	4.04		$	4.31		$	—
Collar contracts with short puts:
Volume (MMBTUs)	115,000			285,000			20,000
Price per MMBTU:
Ceiling	$	4.70		$	5.07		$	5.36
Floor	$	4.00		$	4.00		$	4.00
Short put	$	3.00		$	3.00		$	3.00
Basis swap contracts:
Volume (MMBTUs) (a)	85,082			30,000			—
Price per MMBTU	$	(0.20	)	$	(0.18	)	$	—

_________________

(a) Subsequent to December 31, 2013, the Company entered into additional basis swap contracts for 35,000 MMBTU per day of April through December 2014 production with a negative price differential of $0.27 per MMBTU between the relevant index price and the NYMEX price.

Offsetting Asset and Liability [Table Text Block]

The aggregate fair value of the Company's derivative instruments reported in the consolidated balance sheets by type and counterparty, including the classification between current and noncurrent assets and liabilities, consists of the following:

Fair Value of Derivative Instruments as of December 31, 2013
Type	Consolidated Balance Sheet Location	Fair Value		Gross Amounts Offset in the Consolidated Balance Sheet			Net Fair Value Presented in the Consolidated Balance Sheet
		(in thousands)
Derivatives not designated as hedging instruments
Asset Derivatives:
Commodity price derivatives	Derivatives - current	$	73,431	$	(7,724	)	$	65,707
Interest rate derivatives	Derivatives - current	$	9,530	$	—		$	9,530
Commodity price derivatives	Derivatives - noncurrent	$	95,358	$	(4,504	)	90,854
Interest rate derivatives	Derivatives - noncurrent	$	15,493	$	(15,493	)	$	—
							$	166,091
Liability Derivatives:
Commodity price derivatives	Derivatives - current	$	19,350	$	(7,724	)	$	11,626
Commodity price derivatives	Derivatives - noncurrent	$	4,504	$	(4,504	)	—
Interest rate derivatives	Derivatives - noncurrent	$	25,426	$	(15,493	)	$	9,933
							$	21,559

Fair Value of Derivative Instruments as of December 31, 2012
Type	Consolidated Balance Sheet Location	Fair Value		Gross Amounts Offset in the Consolidated Balance Sheet			Net Fair Value Presented in the Consolidated Balance Sheet
		(in thousands)
Derivatives not designated as hedging instruments
Asset Derivatives:
Commodity price derivatives	Derivatives - current	$	286,805	$	(7,686	)	$	279,119
Commodity price derivatives	Derivatives - noncurrent	$	61,618	$	(6,361	)	55,257
							$	334,376
Liability Derivatives:
Commodity price derivatives	Derivatives - current	$	21,102	$	(7,686	)	$	13,416
Commodity price derivatives	Derivatives - noncurrent	$	8,944	$	(6,361	)	2,583
Interest rate derivatives	Derivatives - noncurrent	$	9,724	$	—		9,724
							$	25,723

Schedule of Derivative Obligations Under Terminated Hedge Arrangements [Table Text Block]

The following table details the location of gains and losses reclassified from AOCI-Hedging into earnings on the Company's discontinued cash flow hedging contracts in the accompanying consolidated statements of operations:

Derivatives in Cash Flow Hedging Relationships	Location of Gain/(Loss) Reclassified from AOCI into Earnings	Amount of Gain/(Loss) Reclassified from AOCI into Earnings
		Year Ended December 31,
		2013		2012			2011
		(in thousands)
Interest rate derivatives	Interest expense	$	—	$	(1,699	)	$	(282	)
Commodity price derivatives	Oil and gas revenue	—		(3,156		)	32,918
Total		$	—	$	(4,855	)	$	32,636

Schedule of Derivative Gains and Losses Recognized on Statement of Operations [Table Text Block]

The following table details the location of gains and losses recognized on the Company's derivative contracts in the accompanying consolidated statements of operations:

Derivatives Not Designated as Hedging Instruments	Location of Gain (Loss) Recognized in Earnings on Derivatives	Amount of Gain (Loss) Recognized in Earnings on Derivatives
		Year Ended December 31,
		2013			2012			2011
		(in thousands)
Interest rate derivatives	Derivative gains, net	$	9,803		$	(22,428	)	$	3,098
Commodity price derivatives	Derivative gains, net	(5,793		)	352,679			389,654
Total		$	4,010		$	330,251		$	392,752

Schedule of Derivative Assets and Liabilities by Counterparty [Table Text Block]

The following table provides the Company's net derivative assets or liabilities by counterparty as of December 31, 2013:

	Net Assets (Liabilities)
	(in thousands)
JP Morgan Chase	$	46,908
Morgan Stanley	17,411
Merrill Lynch	16,979
Barclays Capital	16,923
Den Norske Bank	8,928
Societe Generale	8,754
Macquarie Bank	8,146
J. Aron & Company	6,817
Wells Fargo Bank, N.A.	4,969
Citibank, N.A.	4,857
Deutsche Bank	1,374
BMO Financial Group	1,041
Credit Suisse	992
BP Corporation North America	793
Royal Bank of Canada	752
BNP Paribas	473
Toronto Dominion	(476		)
Mitsubishi UFJ Financial Group	(504		)
Credit Agricole	(605		)
Total	$	144,532

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Exploratory Well Costs (Tables)

12 Months Ended

Dec. 31, 2013

Capitalized Exploratory Well Costs [Abstract]

Capitalized Exploratory Well And Project Activity

The following table reflects the Company's capitalized exploratory well and project activity during each of the years ended December 31, 2013, 2012 and 2011:

	Year Ended December 31,
	2013			2012			2011
	(in thousands)
Beginning capitalized exploratory well costs	$	212,670		$	107,596		$	96,193
Additions to exploratory well costs pending the determination of proved reserves	1,219,797			926,084			524,313
Reclassification due to determination of proved reserves	(1,044,815		)	(790,373		)	(480,716		)
Disposition of assets sold	(92,855		)	—			(28,938		)
Impairment of properties	(86,761		)	—			—
Exploratory well costs charged to exploration and abandonment expense (a)	(49,134		)	(30,637		)	(3,256		)
Ending capitalized exploratory well costs (b)	$	158,902		$	212,670		$	107,596

 _______________

(a) Includes exploration and abandonment expense reclassified as discontinued operations of $43.3 million, $21.6 million, and $180 thousand in 2013, 2012 and 2011, respectively.

(b) Includes $60.3 million of capitalized exploratory well costs classified as held for sale in the accompanying consolidated balance sheet as of December 31, 2013.

Capitalized Exploratory Costs And The Number Of Projects For Which Exploratory Costs Have Been Capitalized

The following table provides an aging, as of December 31, 2013, 2012 and 2011 of capitalized exploratory costs and the number of projects for which exploratory well costs have been capitalized for a period greater than one year, based on the date drilling was completed:

	Year Ended December 31,
	2013		2012		2011
	(in thousands, except well counts)
Capitalized exploratory well costs that have been suspended:
One year or less	$	115,955	$	190,678	$	107,596
More than one year	42,947		21,992		—
	$	158,902	$	212,670	$	107,596
Number of projects with exploratory well costs that have been suspended for a period greater than one year	1		1		—

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Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash flows from operating activities:
Net income (loss)	$ (799,549)	$ 242,822	$ 881,914
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depletion, depreciation and amortization	907,077	708,270	489,579
Impairment of oil and gas properties	1,495,242	0	354,408
Impairment of inventory and other property and equipment	61,812	5,719	3,126
Exploration expenses, including dry holes	21,379	31,189	32,529
Deferred income taxes	(222,374)	286,229	181,330
(Gain) loss on disposition of assets, net	(209,021)	(45,898)	3,644
Accretion of discount on asset retirement obligations	11,862	8,677	7,506
Discontinued operations	612,880	497,579	(265,327)
Interest expense	17,225	35,563	31,483
Derivative related activity	164,121	68,604	(221,899)
Amortization of stock-based compensation	70,999	62,567	41,442
Amortization of deferred revenue	0	(42,069)	(44,951)
Other noncash items	(6,073)	(45,293)	3,599
Change in operating assets and liabilities
Accounts receivable, net	(122,914)	(28,206)	(47,331)
Income taxes receivable	2,663	(5,953)	29,406
Inventories	(39,062)	33,059	(137,401)
Prepaid expenses	(531)	1,447	(3,415)
Other current assets	3,964	14,291	1,957
Accounts payable	208,692	46,038	136,296
Interest payable	(5,709)	10,842	(1,768)
Income taxes payable	(62)	(9,580)	(7,623)
Other current liabilities	(27,342)	(38,320)	61,210
Net cash provided by operating activities	2,145,279	1,837,577	1,529,714
Cash flows from investing activities:
Proceeds from disposition of assets, net of cash sold	711,027	95,564	819,044
Payments for acquisitions, net of cash acquired	0	(297,092)	0
Distribution from (investment in) unconsolidated subsidiary	25,050	0	(89,620)
Additions to oil and gas properties	(2,638,799)	(2,758,073)	(1,926,965)
Additions to other assets and other property and equipment, net	(237,082)	(296,809)	(363,246)
Net cash used in investing activities	(2,139,804)	(3,256,410)	(1,560,787)
Cash flows from financing activities:
Borrowings under long-term debt	466,864	1,776,618	196,616
Principal payments on long-term debt	(1,546,771)	(612,001)	(294,883)
Proceeds from issuance of common stock, net of issuance	1,280,916	0	484,160
Proceeds from issuance of partnership common units, net of issuance costs	0	0	122,976
Distributions to noncontrolling interests	(36,054)	(35,903)	(26,702)
Payments of other liabilities	(3,625)	(1,153)	(901)
Exercise of long-term incentive plan stock options and employee stock purchases	10,054	7,271	3,696
Purchase of treasury stock	(20,102)	(63,325)	(40,355)
Excess tax benefits from share-based payment arrangements	17,639	58,486	31,087
Payment of financing fees	(8)	(9,227)	(8,741)
Dividends paid	(11,138)	(10,021)	(9,556)
Net cash provided by financing activities	157,775	1,110,745	457,397
Net increase (decrease) in cash and cash equivalents	163,250	(308,088)	426,324
Cash and cash equivalents, beginning of period	229,396	537,484	111,160
Cash and cash equivalents, end of period	$ 392,646	$ 229,396	$ 537,484

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Long-Term Debt (Tables)

12 Months Ended

Dec. 31, 2013

Debt Disclosure [Abstract]

Components Of Long-Term Debt

Long-term debt, including the effects of issuance discounts and net deferred fair value hedge losses, consisted of the following components at December 31, 2013 and 2012:

	December 31,
	2013			2012
	(in thousands)
Outstanding debt principal balances:
Pioneer credit facility	$	—		$	474,000
Pioneer Southwest credit facility	—			126,000
5.875% senior notes due 2016	455,385			455,385
6.65% senior notes due 2017	485,100			485,100
6.875 % senior notes due 2018	449,500			449,500
7.500 % senior notes due 2020	450,000			450,000
3.95% senior notes due 2022	600,000			600,000
7.20% senior notes due 2028	250,000			250,000
2.875% convertible senior notes due 2038	—			479,907
	2,689,985			3,769,892
Issuance discounts	(35,885		)	(47,309		)
Net deferred fair value hedge losses	(1,041		)	(1,390		)
Total long-term debt	$	2,653,059		$	3,721,193

Principal Maturities Of Long-Term Debt

Principal maturities of long-term debt at December 31, 2013, are as follows (in thousands):

2014	$	—
2015	$	—
2016	$	455,385
2017	$	485,100
2018	$	449,500
Thereafter	$	1,300,000

Interest Expense

The following amounts have been incurred and charged to interest expense for the years ended December 31, 2013, 2012 and 2011:

	Year Ended December 31,
	2013			2012			2011
	(in thousands)
Cash payments for interest	$	182,126		$	168,665		$	165,251
Amortization of issuance discounts	11,423			27,351			25,210
Amortization of net deferred hedge losses (a)	349			2,018			573
Accretion of discount on postretirement benefit obligations	193			257			315
Amortization of capitalized loan fees	5,260			5,937			5,385
Net changes in accruals	(5,709		)	10,842			(1,768		)
Interest incurred	193,642			215,070			194,966
Less capitalized interest	(9,892		)	(10,848		)	(13,362		)
Total interest expense	$	183,750		$	204,222		$	181,604

_______________

(a) Includes interest rate derivative hedges of $1.7 million and $282 thousand for the periods ended December 31, 2012 and 2011, respectively, that were reclassified from AOCI - Hedging into earnings upon expiration (see Note E).

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Related Party Transactions (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Proceeds from Equity Method Investment, Dividends or Distributions	$ 25.1
EFS Midstream [Member]
Cost reimbursement fixed	3.0	2.3	2.2
Cost reimbursement variable	16.4	11.8	8.4
Payments to Acquire Property, Plant, and Equipment	2.8
Right Of Way [Member] | EFS Midstream [Member]
Related party transaction expenses paid		1.9
Gathering And Treating Fees [Member] | EFS Midstream [Member]
Related party transaction expenses paid	$ 81.3	$ 58.5	$ 21.3

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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2013

Income Tax Disclosure [Abstract]

Summary Of Open Tax Years, By Jurisdiction

The Company's earliest open years in its key jurisdictions are as follows:

United States	2012
Various U.S. states	2009
South Africa	2008

Schedule Of Income Tax (Provision) Benefit Allocation

The Company's income tax (provision) benefit and amounts separately allocated were attributable to the following items for the years ended December 31, 2013, 2012 and 2011:

	Year Ended December 31,
	2013		2012			2011
	(in thousands)
Income tax (provision) benefit from continuing operations	$	211,775	$	(290,488	)	$	(188,278	)
Income tax (provision) benefit from discontinued operations	250,882		182,437			(267,314		)
Changes in goodwill - tax benefits related to stock-based compensation	—		—			40
Changes in stockholders' equity:
Net deferred hedge (loss) gain	—		(1,725		)	8,407
Excess tax benefit related to stock-based compensation	17,639		58,486			31,087
Tax benefit attributable to conversion of 2.875% senior convertible notes	38,415		—			—
Tax benefit attributable to 2013 merger with Pioneer Southwest	200,091		—			—
Tax attributable to 2008 Pioneer Southwest initial public offering	—		(49,072		)	—
Tax attributable to 2009 and 2011 issuance of Pioneer Southwest common units	—		—			(23,711		)
Tax on Pioneer Southwest common units sold by the Company during 2011	—		—			(15,381		)

Income Tax (Provision) Benefit Attributable To Income From Continuing Operations

The Company's income tax (provision) benefit attributable to income from continuing operations consisted of the following for the years ended December 31, 2013, 2012 and 2011:

	Year Ended December 31,
	2013			2012			2011
	(in thousands)
Current:
U.S. federal	$	(10,406	)	$	(5,575	)	$	—
U.S. state	44			1,316			(6,948		)
Foreign	(237		)	—			—
	(10,599		)	(4,259		)	(6,948		)
Deferred:
U.S. federal	201,060			(272,289		)	(179,699		)
U.S. state	21,314			(13,940		)	(1,631		)
	222,374			(286,229		)	(181,330		)
Income tax (provision) benefit from continuing operations	$	211,775		$	(290,488	)	$	(188,278	)

Schedule Of Effective Income Tax Rate Reconciliation

Reconciliations of the United States federal statutory tax rate to the Company's effective tax rate for income (loss) from continuing operations are as follows for the years ended December 31, 2013, 2012 and 2011:

	Year Ended December 31,
	2013			2012			2011
	(in thousands, except percentages)
Income (loss) from continuing operations before income taxes	$	(561,719	)	$	837,520		$	596,068
Less: Net income attributable to noncontrolling interests	(38,865		)	(50,537		)	(47,425		)
Income (loss) from continuing operations attributable to common stockholders before income taxes	(600,584		)	786,983			548,643
Federal statutory income tax rate	35		%	35		%	35		%
(Provision) benefit for federal income taxes	210,204			(275,444		)	(192,025		)
State income tax (provision) benefit (net of federal tax)	13,883			(8,206		)	(5,576		)
Other	(12,312		)	(6,838		)	9,323
Income tax (provision) benefit from continuing operations	$	211,775		$	(290,488	)	$	(188,278	)
Effective income tax rate, excluding income attributable to the noncontrolling interest	35		%	37		%	34		%

Schedule Of Deferred Tax Assets And Deferred Tax Liabilities

The tax effects of temporary differences that give rise to significant portions of the deferred tax assets and deferred tax liabilities related to continuing operations are as follows as of December 31, 2013 and 2012:

	December 31,
	2013			2012
	(in thousands)
Deferred tax assets:
Net operating loss carryforward (a) (b)	$	328,874		$	509,485
Asset retirement obligations	73,623			72,391
Incentive plans	67,990			51,056
Other	74,184			107,836
Total deferred tax assets	544,671			740,768
Deferred tax liabilities:
Oil and gas properties, principally due to differences in basis, depletion and the deduction of intangible drilling costs for tax purposes	(1,569,886		)	(2,322,571		)
Other property and equipment, principally due to the deduction of bonus depreciation for tax purposes	(254,632		)	(263,939		)
Net deferred hedge gains	(108,784		)	(173,097		)
Other	(103,255		)	(208,058		)
Total deferred tax liabilities	(2,036,557		)	(2,967,665		)
Net deferred tax liability	$	(1,491,886	)	$	(2,226,897	)
Reflected in accompanying consolidated balance sheets as:
Current deferred income tax liability	$	(19,169	)	$	(86,481	)
Noncurrent deferred income tax liability	(1,472,717		)	(2,140,416		)
Total	$	(1,491,886	)	$	(2,226,897	)

____________________

(a) Net operating loss carryforwards as of December 31, 2013 consist of $917.4 million of U.S. federal NOLs which expire primarily in 2032, $122.0 million of Colorado NOLs which expire between 2027 and 2033 and $50.6 million of Kansas NOLs which expire between 2018 and 2023.

(b) Net operating loss carryforwards as of December 31, 2013 are net of a $1.5 million valuation allowance relating to $32 million of Kansas NOLs that the Company believes will more likely than not expire unutilized.

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Disclosures About Fair Value Measurements (Measured On A Nonrecurring Basis) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of oil and gas properties	$ 1,495,242,000	$ 0	$ 354,408,000
Management oil price outlook	80.40	87.09	92.69
Management gas price outlook	4.43	4.78	5.14
South Texas Edwards And Austin Chalk [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value of Asset Group			189,900,000
Impairment of oil and gas properties			354,400,000
Barnett Shale Field [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value of Asset Group		184,800,000
Impairment of oil and gas properties		532,600,000
Raton Field [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value of Asset Group	533,600,000
Impairment of oil and gas properties	$ 1,495,200,000

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Incentive Plans (Schedule Of Weighted-Average Assumptions To Estimate The Fair Value) (Details) (Stock Options [Member])	12 Months Ended
	Dec. 31, 2012 Rate	Dec. 31, 2011 Rate
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected option life - years	7 years 0 months 1 day	7 years 0 months 1 day
Volatility	49.40%	47.60%
Risk-free interest rate	1.50%	2.90%
Dividend yield	0.40%	0.40%

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Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 392,646	$ 229,396
Accounts receivable:
Trade, net	430,732	316,854
Due from affiliates	2,753	3,299
Income taxes receivable	4,784	7,447
Inventories	220,125	197,056
Prepaid expenses	15,852	13,438
Assets held for sale	583,750	0
Other current assets:
Derivatives	75,237	279,119
Other	2,555	3,746
Total current assets	1,728,434	1,050,355
Oil and gas properties, using the successful efforts method of accounting:
Proved properties	13,406,135	14,259,708
Unproved properties	123,382	231,555
Accumulated depletion, depreciation and amortization	(4,903,122)	(4,412,913)
Total property, plant and equipment	8,626,395	10,078,350
Goodwill	274,329	298,142
Other property and equipment, net	1,224,153	1,217,694
Other assets:
Investment in unconsolidated affiliate	224,850	204,129
Derivatives	90,854	55,257
Other, net	123,773	165,103
Assets, Total	12,292,788	13,069,030
Accounts payable:
Trade	910,393	729,942
Due to affiliates	150,164	96,935
Interest payable	62,374	68,083
Income taxes payable	165	208
Deferred income taxes	19,169	86,481
Liabilities held for sale	38,562	0
Other current liabilities:
Derivatives	11,626	13,416
Other	57,653	39,725
Total current liabilities	1,250,106	1,034,790
Long-term debt	2,653,059	3,721,193
Derivatives	9,933	12,307
Deferred income taxes	1,472,717	2,140,416
Other liabilities	292,215	293,016
Stockholders' equity:
Common stock, $.01 par value	1,458	1,350
Additional paid-in capital	5,079,821	3,683,934
Treasury stock, at cost	(144,776)	(510,570)
Retained earnings	1,665,081	2,514,640
Total stockholders' equity attributable to common stockholders	6,601,584	5,689,354
Noncontrolling interest in consolidating subsidiaries	13,174	177,954
Total stockholders' equity	6,614,758	5,867,308
Liabilities and Stockholders' Equity, Total	$ 12,292,788	$ 13,069,030

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Summary of Significant Accounting Policies (Schedule of Other Property Plant and Equipment) (Details) (USD $)	Dec. 31, 2013		Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 1,224,153,000	[1]	$ 1,217,694,000	[1]
Accumulated depreciation property, plant and equipment, other assets	458,400,000		395,900,000
Drilling rigs owned	15
Fracture Stimulation Fleets	11
Proved and Unproved Sand Leaseholds [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	451,384,000	[2]	457,033,000	[2]
Wells and Related Equipment and Facilities [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	313,165,000	[3]	385,887,000	[3]
Land and Building [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	344,554,000		259,629,000
Transportation Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	41,397,000		44,928,000
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	47,905,000		43,614,000
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	25,748,000		26,603,000
Sendero [Member] | Wells and Related Equipment and Facilities [Member]
Property, Plant and Equipment [Line Items]
Assets Held-for-sale, Property, Plant and Equipment	$ 17,900,000

[1] (a)At December 31, 2013 and 2012, other property and equipment was net of accumulated depreciation of $458.4 million and $395.9 million, respectively.

[2] (b)Includes sand mines, sales facilities and unproved leaseholds that primarily provide the Company and other unrelated customers with proppant used in the fracture stimulation of oil and gas wells.

[3] (c)Includes drilling rigs, well servicing rigs and equipment and fracture stimulation equipment including assets owned by subsidiaries that provide drilling, pumping and well services on Company-operated properties. As of December 31, 2013, the Company owned 15 drilling rigs, eleven fracture stimulation fleets and other oilfield services equipment, including pulling units, fracture stimulation tanks, water transport trucks, hot oilers, blowout preventers, construction equipment and fishing tools. During December 2013, the Company committed to a plan to sell its majority interest in Sendero Drilling Company, LLC ("Sendero"), which owns the Company's 15 vertical drilling rigs, to Sendero's minority interest owner. Associated therewith, the Company has classified the assets and liabilities of Sendero, including $17.9 million of drilling rigs, as assets held for sale in the accompanying consolidated balance sheet as of December 31, 2013. See Note C for additional information.

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Consolidated Statements Of Stockholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interests [Member]	Pioneer Southwest [Member]	Pioneer Southwest [Member] Additional Paid-In Capital [Member]	Pioneer Southwest [Member] Noncontrolling Interests [Member]
Beginning Balance at Dec. 31, 2010	$ 4,226,025	$ 1,262	$ 3,022,768	$ (421,235)	$ 1,510,427	$ 7,361	$ 105,442
Beginning Balance, shares at Dec. 31, 2010	115,309,000
Stock Issued During Period, Shares, New Issues	5,500,000
Issuance of Common Stock	484,160	55	484,105
Sale of Pioneer Southwest common units, net of tax								35,091	26,915	8,176
Issuance of Pioneer Southwest common units, net of tax								48,792	8,104	40,688
Dividends declared ($0.08 per share)	(9,498)				(9,498)
Exercise of long-term incentive plan stock options and employee stock purchases, shares	76,000
Exercise of long-term incentive plan stock options and employee stock purchases	3,696		951	3,097	(352)
Purchase of treasury stock, shares	(439,000)
Purchase of treasury stock	(40,355)			(40,157)			(198)
Conversion of 2.875% senior convertible notes, shares	0
Conversion of 2.875% senior convertible notes	(6)		(20)	14
Tax benefits related to stock-based compensation	31,087		31,087
Deferred tax provision attributable to 2008 Pioneer Southwest initial public offering									0
Pioneer Southwest noncontrolling interest transferred to APIC									0
Pioneer Southwest merger transaction costs									0
Deferred tax benefit associated with the Pioneer Southwest merger									0
Disposition of subsidiary	(510)		(510)
Compensation costs:
Vested compensation awards, net, shares	1,410,000
Vested compensation awards, net	0	14	(14)
Compensation costs included in net income	41,673		40,422				1,251
Cash distributions to noncontrolling interests	(26,702)						(26,702)
Net income (loss)	881,914				834,489		47,425
Deferred hedging activity, net of tax:
Net hedge (gains) losses included in continuing operations	(24,229)					(10,491)	(13,738)
Ending Balance at Dec. 31, 2011	5,651,138	1,331	3,613,808	(458,281)	2,335,066	(3,130)	162,344
Ending Balance, shares at Dec. 31, 2011	121,856,000
Sale of Pioneer Southwest common units, net of tax									0
Issuance of Pioneer Southwest common units, net of tax									0
Dividends declared ($0.08 per share)	(9,989)				(9,989)
Exercise of long-term incentive plan stock options and employee stock purchases, shares	195,000
Exercise of long-term incentive plan stock options and employee stock purchases	7,271		(849)	10,842	(2,722)
Purchase of treasury stock, shares	(542,000)
Purchase of treasury stock	(63,325)			(63,136)			(189)
Conversion of 2.875% senior convertible notes, shares	0
Conversion of 2.875% senior convertible notes	0		(5)	5
Tax benefits related to stock-based compensation	58,486		58,486
Deferred tax provision attributable to 2008 Pioneer Southwest initial public offering	(49,072)		(49,072)						(49,072)
Pioneer Southwest noncontrolling interest transferred to APIC									0
Pioneer Southwest merger transaction costs									0
Deferred tax benefit associated with the Pioneer Southwest merger									0
Compensation costs:
Vested compensation awards, net, shares	1,847,000
Vested compensation awards, net	0	19	(19)
Compensation costs included in net income	62,750		61,585				1,165
Cash distributions to noncontrolling interests	(35,903)						(35,903)
Net income (loss)	242,822				192,285		50,537
Deferred hedging activity, net of tax:
Net hedge (gains) losses included in continuing operations	3,130					3,130	0
Ending Balance at Dec. 31, 2012	5,867,308	1,350	3,683,934	(510,570)	2,514,640	0	177,954
Ending Balance, shares at Dec. 31, 2012	123,356,000
Stock Issued During Period, Shares, New Issues	10,350,000
Issuance of Common Stock	1,280,916	103	1,280,813
Sale of Pioneer Southwest common units, net of tax									0
Issuance of Pioneer Southwest common units, net of tax									0
Dividends declared ($0.08 per share)	(11,145)				(11,145)
Exercise of long-term incentive plan stock options and employee stock purchases, shares	222,000
Exercise of long-term incentive plan stock options and employee stock purchases	10,054		11	10,043	0
Purchase of treasury stock, shares	(154,000)
Purchase of treasury stock	(20,102)			(20,102)
Conversion of 2.875% senior convertible notes, shares	4,381,000
Conversion of 2.875% senior convertible notes	(8)		(197,240)	197,232
Tax benefit related to conversion of 2.875% senior convertible notes	38,415		38,415
Tax benefits related to stock-based compensation	17,639		17,639
Deferred tax provision attributable to 2008 Pioneer Southwest initial public offering									0
Issuance of treasury stock to acquire outstanding PSE units, shares	3,956,000
Issuance of treasury stock to acquire outstanding PSE units	0		(178,621)	178,621
Pioneer Southwest noncontrolling interest transferred to APIC	0		168,685				(168,685)		168,685
Pioneer Southwest merger transaction costs	(3,880)		(3,880)						(3,880)
Deferred tax benefit associated with the Pioneer Southwest merger	200,091		200,091						200,091
Compensation costs:
Vested compensation awards, net, shares	517,000
Vested compensation awards, net	0	5	(5)
Compensation costs included in net income	71,073		69,979				1,094
Cash distributions to noncontrolling interests	(36,054)						(36,054)
Net income (loss)	(799,549)				(838,414)		38,865
Ending Balance at Dec. 31, 2013	$ 6,614,758	$ 1,458	$ 5,079,821	$ (144,776)	$ 1,665,081		$ 13,174
Ending Balance, shares at Dec. 31, 2013	142,628,000

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Net Income (Loss) Per Share Attributable To Common Stockholders (Reconciliation Of Earnings Attributable To Common Stockholders, Basic And Diluted) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Statement Operating Activities Segment [Line Items]
Income (loss) from continuing operations, net of tax	$ (388,809)		$ 496,495		$ 360,365
Income (loss) as reported, Discontinued Operations	(449,605)		(304,210)		474,124
Income (loss) as reported	(838,414)		192,285		834,489
Participating basic earnings	(130)	[1]	(3,029)	[1]	(15,178)	[1]
Basic income (loss) attributable to common stockholders	(838,544)		189,256		819,311
Reallocation of participating earnings	0	[1]	161	[1]	385	[1]
Diluted income (loss) attributable to common stockholders	(838,544)		189,417		819,696
Segment, Continuing Operations [Member]
Statement Operating Activities Segment [Line Items]
Income (loss) from continuing operations, net of tax	(388,809)		496,495		360,365
Participating basic earnings	(60)	[1]	(2,160)	[1]	(6,554)	[1]
Basic income (loss) attributable to common stockholders	(388,869)		494,335		353,811
Reallocation of participating earnings	0	[1]	115	[1]	166	[1]
Diluted income (loss) attributable to common stockholders	(388,869)		494,450		353,977
Discontinued Operations [Member]
Statement Operating Activities Segment [Line Items]
Income (loss) as reported, Discontinued Operations	(449,605)		(304,210)		474,124
Participating basic earnings	(70)	[1]	(869)	[1]	(8,624)	[1]
Basic income (loss) attributable to common stockholders	(449,675)		(305,079)		465,500
Reallocation of participating earnings	0	[1]	46	[1]	219	[1]
Diluted income (loss) attributable to common stockholders	$ (449,675)		$ (305,033)		$ 465,719

[1] (a)Unvested restricted stock awards and Pioneer Southwest phantom unit awards (prior to the December 2013 Pioneer Southwest merger) represent participating securities because they participate in nonforfeitable dividends or distributions with the common equity owners of the Company or Pioneer Southwest, as applicable. Participating share- or unit-based earnings represent the distributed and undistributed earnings of the Company attributable to the participating securities. Unvested restricted stock awards and phantom unit awards do not participate in undistributed net losses as they are not contractually obligated to do so.

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Derivative Financial Instruments (Offsetting Assets and Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Derivative [Line Items]
Derivative Asset, Current	$ 75,237	$ 279,119
Derivative Asset, Noncurrent	90,854	55,257
Derivative Asset, Fair Value, Amount Not Offset Against Collateral		334,376
Derivative Liability, Current	11,626	13,416
Derivative Liability, Noncurrent	9,933	12,307
Not Designated As Hedging Instruments [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	166,091	334,376
Derivative Financial Instruments, Liabilities, Fair Value Disclosure	21,559	25,723
Derivative Noncurrent [Member] | Not Designated As Hedging Instruments [Member] | Commodity Price Derivatives [Member]
Derivative [Line Items]
Total derivatives, Asset	95,358	61,618
Total derivatives, Liability	4,504	8,944
Derivative Assets Offset In Balance Sheet	4,504	6,361
Derivative Liabilities Offset In Balance Sheet	4,504	6,361
Derivative Asset, Noncurrent	90,854
Derivative Liability, Noncurrent	0	2,583
Derivative Noncurrent [Member] | Not Designated As Hedging Instruments [Member] | Interest Rate Derivatives [Member]
Derivative [Line Items]
Total derivatives, Asset	15,493
Total derivatives, Liability	25,426	9,724
Derivative Assets Offset In Balance Sheet	15,493
Derivative Liabilities Offset In Balance Sheet	15,493	0
Derivative Asset, Noncurrent	0
Derivative Liability, Noncurrent	9,933	9,724
Derivative Current [Member] | Not Designated As Hedging Instruments [Member] | Commodity Price Derivatives [Member]
Derivative [Line Items]
Total derivatives, Asset	73,431	286,805
Total derivatives, Liability	19,350	21,102
Derivative Assets Offset In Balance Sheet	7,724	7,686
Derivative Liabilities Offset In Balance Sheet	7,724	7,686
Derivative Asset, Current	65,707
Derivative Liability, Current	11,626
Derivative Current [Member] | Not Designated As Hedging Instruments [Member] | Interest Rate Derivatives [Member]
Derivative [Line Items]
Total derivatives, Asset	9,530
Derivative Assets Offset In Balance Sheet	0
Derivative Asset, Current	$ 9,530

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Commitments And Contingencies (Tables)

12 Months Ended

Dec. 31, 2013

Commitments and Contingencies Disclosure [Abstract]

Schedule of Future Minimum Lease Commitments [Text Block]

Future minimum lease commitments under noncancelable operating leases at December 31, 2013 are as follows (in thousands):

2014	$	25,305
2015	$	18,495
2016	$	16,135
2017	$	15,637
2018	$	15,418
Thereafter	$	26,569

Future Minimum Gathering, Processing And Transportation Fees

Future minimum gathering, processing, transportation and fractionation commitments at December 31, 2013 are as follows (in thousands):

2014	$	353,167
2015	$	404,493
2016	$	418,665
2017	$	282,077
2018	$	245,250
Thereafter	$	773,868

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Long-Term Debt (Components Of Long-Term Debt) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013 Rate	Dec. 31, 2012	Jun. 30, 2012 Rate
Debt Instrument [Line Items]
Outstanding debt principal balances, gross	$ 2,689,985	$ 3,769,892
Issuance discounts and premiums, net	(35,885)	(47,309)
Net deferred fair value hedge losses	(1,041)	(1,390)
Long-term Debt	2,653,059	3,721,193
Pioneer Credit Facility [Member]
Debt Instrument [Line Items]
Outstanding borrowing	0	474,000
Pioneer Southwest Credit Facility [Member]
Debt Instrument [Line Items]
Outstanding borrowing	0	126,000
5.875% Senior Notes Due 2016 [Member]
Debt Instrument [Line Items]
Issuance of senior notes	455,385	455,385
Senior notes, interest rate	5.875%
6.65% Senior Notes Due 2017 [Member]
Debt Instrument [Line Items]
Issuance of senior notes	485,100	485,100
Senior notes, interest rate	6.65%
6.875% Senior Notes Due 2018 [Member]
Debt Instrument [Line Items]
Issuance of senior notes	449,500	449,500
Senior notes, interest rate	6.875%
7.500% Senior Notes Due 2020 [Member]
Debt Instrument [Line Items]
Issuance of senior notes	450,000	450,000
Senior notes, interest rate	7.50%
3.95% Senior Notes Due 2022 [Member]
Debt Instrument [Line Items]
Issuance of senior notes	600,000	600,000	600,000
Senior notes, interest rate	3.95%		3.95%
7.20% Senior Notes Due 2028 [Member]
Debt Instrument [Line Items]
Issuance of senior notes	250,000	250,000
Senior notes, interest rate	7.20%
2.875% Convertible Senior Notes Due 2038 [Member]
Debt Instrument [Line Items]
Convertible debt	$ 0	$ 479,907
Senior notes, interest rate	2.875%

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Other Expense

12 Months Ended

Dec. 31, 2013

Other Expense [Abstract]

Other Expense

NOTE N.    Other Expense

The following table provides the components of the Company's other expense during the years ended December 31, 2013, 2012 and 2011:

	Year Ended December 31,
	2013		2012		2011
	(in thousands)
Impairment of inventory and other property and equipment (a)	$	61,812	$	5,719	$	3,126
Transportation commitment charge (b)	39,121		38,830		23,841
Other	16,386		17,940		11,884
Above market and idle drilling and well service equipment charges (c)	9,771		33,124		20,163
Contingency and environmental accrual adjustments	9,277		478		4,057
Terminated drilling rig contract charges (d)	1,019		15,747		—
Premier Silica acquisition costs	—		2,337		—
Total other expense	$	137,386	$	114,175	$	63,071

 ____________________

(a) Represents charges of $36.3 million to reduce excess materials and supplies inventories to their market value and a charge of $25.5 million to reduce the carrying value of Sendero to its estimated fair value. See Notes C and D for additional information on the fair value of Sendero and material and supplies inventory, respectively.

(b) Primarily represents firm transportation payments on excess pipeline capacity commitments.

(c) Primarily represents expenses attributable to the portion of Pioneer's contracted drilling rig rates that were above market rates and idle drilling rig and fracture stimulation fleet fees, neither of which were chargeable to joint operations.

(d) Primarily represents charges to terminate rig contracts that were not required to meet planned drilling activities.

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Related Party Transactions (Tables)

12 Months Ended

Dec. 31, 2013

Related Party Transactions [Abstract]

Schedule Of Related Party Transactions

The related party transactions with affiliated partnerships are summarized below for the years ended December 31, 2013, 2012 and 2011:

	Year Ended December 31,
	2013		2012		2011
	(in thousands)
Receipt of lease operating and supervision charges in accordance with standard industry operating agreements	$	2,502	$	2,437	$	2,104
Reimbursement of general and administrative expenses	$	276	$	342	$	313

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Net Income (Loss) Per Share Attributable To Common Stockholders

12 Months Ended

Dec. 31, 2013

Earnings Per Share [Abstract]

Net Income (Loss) Per Share Attributable To Common Stockholders

NOTE P.    Net Income Per Share Attributable To Common Stockholders

In the calculation of basic net income (loss) per share attributable to common stockholders, participating securities are allocated earnings based on actual dividend distributions received plus a proportionate share of undistributed net income attributable to common stockholders, if any, after recognizing distributed earnings. The Company's participating securities do not participate in undistributed net losses because they are not contractually obligated to do so. The computation of diluted net income (loss) per share attributable to common stockholders reflects the potential dilution that could occur if securities or other contracts to issue common stock that are dilutive were exercised or converted into common stock or resulted in the issuance of common stock that would then share in the earnings of the Company. During periods in which the Company realizes a loss from continuing operations attributable to common stockholders, securities or other contracts to issue common stock would not be dilutive to net loss per share and conversion into common stock is assumed not to occur. Diluted net income (loss) per share is calculated under both the two-class method and the treasury stock method and the more dilutive of the two calculations is presented.

The Company's basic net income (loss) per share attributable to common stockholders is computed as (i) net income (loss) attributable to common stockholders, (ii) less participating share- and unit-based basic earnings (iii) divided by weighted average basic shares outstanding. The Company's diluted net income (loss) per share attributable to common stockholders is computed as (i) basic net income (loss) attributable to common stockholders, (ii) plus diluted adjustments to participating undistributed earnings (iii) divided by weighted average diluted shares outstanding (excluding shares held in treasury).

The following table is a reconciliation of the Company's net income (loss) attributable to common stockholders to basic net income (loss) attributable to common stockholders and to diluted net income (loss) attributable to common stockholders for the years ended December 31, 2013, 2012 and 2011:

	Year Ended December 31, 2013
	Continuing Operations			Discontinued Operations			Total
	(in thousands)
Net loss attributable to common stockholders	$	(388,809	)	$	(449,605	)	$	(838,414	)
Participating basic earnings (a)	(60		)	(70		)	(130		)
Basic loss attributable to common stockholders	(388,869		)	(449,675		)	(838,544		)
Reallocation of participating earnings (a)	—			—			—
Diluted loss attributable to common stockholders	$	(388,869	)	$	(449,675	)	$	(838,544	)

	Year Ended December 31, 2012
	Continuing Operations			Discontinued Operations			Total
	(in thousands)
Net income (loss) attributable to common stockholders	$	496,495		$	(304,210	)	$	192,285
Participating basic earnings (a)	(2,160		)	(869		)	(3,029		)
Basic income (loss) attributable to common stockholders	494,335			(305,079		)	189,256
Reallocation of participating earnings (a)	115			46			161
Diluted income (loss) attributable to common stockholders	$	494,450		$	(305,033	)	$	189,417

	Year Ended December 31, 2011
	Continuing Operations			Discontinued Operations			Total
	(in thousands)
Net income attributable to common stockholders	$	360,365		$	474,124		$	834,489
Participating basic earnings (a)	(6,554		)	(8,624		)	(15,178		)
Basic net income attributable to common stockholders	353,811			465,500			819,311
Reallocation of participating earnings (a)	166			219			385
Diluted income attributable to common stockholders	$	353,977		$	465,719		$	819,696

 ______________________

(a) Unvested restricted stock awards and Pioneer Southwest phantom unit awards (prior to the December 2013 Pioneer Southwest merger) represent participating securities because they participate in nonforfeitable dividends or distributions with the common equity owners of the Company or Pioneer Southwest, as applicable. Participating share- or unit-based earnings represent the distributed and undistributed earnings of the Company attributable to the participating securities. Unvested restricted stock awards and phantom unit awards do not participate in undistributed net losses as they are not contractually obligated to do so.

The following table is a reconciliation of basic weighted average common shares outstanding to diluted weighted average common shares outstanding for the years ended December 31, 2013, 2012 and 2011:

	Year Ended December 31,
	2013 (a)	2012	2011
	(in thousands)
Weighted average common shares outstanding:
Basic	136,130	122,966	116,904
Dilutive common stock options (b)	—	183	190
Contingently issuable—performance shares	—	180	424
Convertible Senior Notes dilution (c)	—	2,991	1,697
Diluted	136,130	126,320	119,215

______________________

(a) The following common share equivalents were excluded from the weighted average diluted shares for the year ended December 31, 2013 because they would have been anti-dilutive to the loss recorded for the period: (i) 135,190 outstanding options to purchase the Company's common stock, (ii) 200,360 common shares attributable to unvested performance awards and (iii) 1,087,401 common shares related to the 2013 redemption of the Convertible Senior Notes, representing the weighted average portion of the year that is not included in the basic weighted average common shares outstanding.

(b) Options to purchase 129,918 shares of the Company's common stock were excluded from the diluted income per share calculations for the year ended December 31, 2012 because they would have been anti-dilutive to the calculation.

(c) Weighted average common shares outstanding have been increased to reflect the dilutive effect that would have resulted if the Convertible Senior Notes had qualified for and been converted during the years ended December 31, 2012 and 2011, respectively.

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Incentive Plans (Narrative) (Details) (USD $)	12 Months Ended																							12 Months Ended													12 Months Ended				12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 PSE Ltip Phantom Units [Member]		Dec. 31, 2012 PSE Ltip Phantom Units [Member]	Dec. 31, 2011 PSE Ltip Phantom Units [Member]	Dec. 31, 2013 Deferred Compensation Retirement Plan [Member] Rate	Dec. 31, 2012 Deferred Compensation Retirement Plan [Member]	Dec. 31, 2011 Deferred Compensation Retirement Plan [Member]	Dec. 31, 2013 Deferred Compensation Retirement Plan [Member] Bonus [Member] Rate	Dec. 31, 2013 Deferred Compensation Retirement Plan [Member] Base Salary [Member] Rate	Dec. 31, 2013 401(k) Plan [Member] Rate	Dec. 31, 2012 401(k) Plan [Member]	Dec. 31, 2011 401(k) Plan [Member]	Dec. 31, 2013 Restricted Stock Equity Awards [Member]	Dec. 31, 2012 Restricted Stock Equity Awards [Member]	Dec. 31, 2011 Restricted Stock Equity Awards [Member]	Dec. 31, 2013 Restricted Stock Liability Awards [Member]	Dec. 31, 2012 Restricted Stock Liability Awards [Member]	Dec. 31, 2011 Restricted Stock Liability Awards [Member]	Dec. 31, 2013 Restricted Stock [Member]	Dec. 31, 2013 Pioneer Long-Term Incentive Plan [Member]	Dec. 31, 2013 Stock Options [Member]		Dec. 31, 2012 Stock Options [Member]		Dec. 31, 2011 Stock Options [Member]		Dec. 31, 2013 Performance Unit Awards [Member]	Dec. 31, 2012 Performance Unit Awards [Member]	Dec. 31, 2011 Performance Unit Awards [Member]	Dec. 31, 2013 Pioneer Southwest LTIP [Member]	Dec. 31, 2012 Pioneer Southwest LTIP [Member]	Dec. 31, 2011 Pioneer Southwest LTIP [Member]	Dec. 17, 2013 Pioneer Southwest LTIP [Member]	Dec. 31, 2012 Pioneer Southwest Employee Long Term Incentive Plan [Member]	Dec. 31, 2011 Pioneer Southwest Employee Long Term Incentive Plan [Member]	Dec. 31, 2013 Pioneer Southwest Employee Long Term Incentive Plan [Member]	Dec. 17, 2013 Pioneer Southwest Employee Long Term Incentive Plan [Member]	Dec. 31, 2013 Sendero B Units [Member]	Dec. 31, 2012 Sendero B Units [Member]	Dec. 31, 2011 Sendero B Units [Member]	Dec. 31, 2010 Sendero B Units [Member]	Dec. 31, 2013 Employee Stock [Member] Rate	Dec. 31, 2012 Employee Stock [Member]	Dec. 31, 2011 Employee Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Participants annual salary contributions to 401(k) Plan, percentage											100.00%	25.00%	80.00%
Matching contributions percent								100.00%					200.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay											8.00%	10.00%	5.00%
Matching contributions								$ 2,700,000	$ 2,400,000	$ 2,200,000
Matching contributions vesting period in years	4
Deferred Compensation Arrangement with Individual, Compensation Expense	112,432,000	86,084,000	53,085,000										29,700,000	24,700,000	18,300,000	56,165,000	48,876,000	32,861,000	40,404,000	22,419,000	10,882,000			2,952,000	[1]	4,110,000	[1]	2,936,000	[1]												1,020,000	982,000	1,020,000		1,731,000	2,437,000	125,000
Unrecognized share-based compensation expense	146,300,000																		44,800,000
Restricted Units Vesting Schedule	3 years 0 months 0 days
Approved and authorized awards																							9,100,000													3,000,000									1,250,000
Number of Units granted				7,492	[2]											433,311			250,641			683,952																						1,000
Grant Date Fair Value																																												5,100,000
Number of unvested shares																197,340
Weighted Average Grant-Date Fair Value, Shares granted				$ 110.32		$ 120.43	$ 138.32									$ 134.58	$ 113.02	$ 97.52								$ 56.29		$ 49.61		$ 189.23	$ 172.57	$ 134.68					$ 114.75	$ 126.24
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value				799,000												67,700,000	137,200,000	98,600,000	26,100,000	14,200,000	6,700,000									18,900,000	18,800,000	44,700,000	200,000	200,000	342,000
Amount of liabilities attributable to liability awards included in accounts payable																			33,000,000	18,800,000
Option awards contract life																								10
Average dividend yield																								7
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercised, Intrinsic Value																								20,500,000		17,200,000		1,500,000
Service period for the performance unit awards, years																														34
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant																							2,593,429													2,900,000			654,842	678,034					515,028
Restricted units to directors																																		7,496	6,812		1,743	1,584
Number of key employees participated in restricted unit agreements																																												2
Employee stock purchase plan contribution limit																																													15.00%
Employee stock purchase plan participants purchase price percent																																													15.00%
Unfunded accumulated postretirement benefit obligations determined by actuaries	$ 7,600,000	$ 9,700,000

[1] (a)Cash proceeds received from stock option exercises during 2013, 2012 and 2011 amounted to $5.0 million, $3.1 million and $619 thousand, respectively.

[2] (a)Reflects the number of awards in Pioneer common stock after the Pioneer Southwest merger based upon the Conversion Ratio.

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Consolidated Statements Of Stockholders' Equity (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement of Stockholders' Equity [Abstract]
Dividends declared, per share	$ 0.08	$ 0.08	$ 0.08

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Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Statement of Financial Position [Abstract]
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares issued	145,833,707	134,966,740
Treasury stock, shares	3,206,054	11,611,093

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Asset Retirement Obligations

12 Months Ended

Dec. 31, 2013

Asset Retirement Obligation [Abstract]

Asset Retirement Obligations

NOTE I.    Asset Retirement Obligations

The Company's asset retirement obligations primarily relate to the future plugging and abandonment of wells and related facilities. Market risk premiums associated with asset retirement obligations are estimated to represent a component of the Company's credit-adjusted risk-free rate that is utilized in the calculations of asset retirement obligations. The following table summarizes the Company's asset retirement obligation activity during the years ended December 31, 2013, 2012 and 2011:

	Year Ended December 31,
	2013			2012			2011
	(in thousands)
Beginning asset retirement obligations	$	197,754		$	136,742		$	152,291
Obligations assumed in acquisitions	—			10,498			6
New wells placed on production	5,775			9,593			9,233
Changes in estimates (a)	7,939			51,536			7,490
Obligations reclassified to liabilities held for sale	(10,091		)	—			(29,892		)
Disposition of wells	(6,083		)	(2,536		)	(448		)
Obligations settled	(13,953		)	(18,066		)	(12,880		)
Accretion of discount on continuing operations	11,862			8,677			7,506
Accretion of discount from integrated services (b)	14			100			—
Accretion of discount on discontinued operations	831			1,210			3,436
Ending asset retirement obligations	$	194,048		$	197,754		$	136,742

 _____________________

(a) The changes in the 2013, 2012 and 2011 estimates are primarily due to increases in abandonment cost estimates based on recent actual costs incurred to abandon wells and declines in credit-adjusted risk-free discount rates used to value increases in asset retirement obligations. The increases in 2013 and 2011 estimates were partially offset by higher commodity prices, which had the effect of lengthening the economic life of certain wells and decreasing the present value of future retirement obligations. The increase in the 2012 estimate was further impacted by declines in oil, NGL and gas prices used to calculate proved reserves, which had the effect of shortening the economic life of certain wells and increasing the present value of future retirement obligations.

(b) Accretion of discount from integrated services includes Premier Silica accretion expense, which is recorded as a reduction in income from vertical integration services in interest and other income in the Company's accompanying consolidated statements of operations. See Note M for more information about interest and other income.

As of December 31, 2013 and 2012, the current portions of the Company's asset retirement obligations were $19.3 million and $13.3 million, respectively.

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Income Taxes (Schedule Of Deferred Tax Assets And Deferred Tax Liabilities) (Details) (USD $)	Dec. 31, 2013		Dec. 31, 2012
Income Tax Disclosure [Abstract]
Net operating loss carryforward	$ 328,874,000	[1],[2]	$ 509,485,000	[1],[2]
Asset retirement obligations	73,623,000		72,391,000
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost	67,990,000		51,056,000
Other	74,184,000		107,836,000
Total deferred tax assets	544,671,000		740,768,000
Oil and gas properties, principally due to differences in basis, depletion and the deduction of intangible drilling costs for tax purposes	(1,569,886,000)		(2,322,571,000)
Other property and equipment, principally due to the deduction of bonus depreciation for tax purposes	(254,632,000)		(263,939,000)
State taxes and other	(103,255,000)		(208,058,000)
Net deferred hedge gains	(108,784,000)		(173,097,000)
Total deferred tax liabilities	(2,036,557,000)		(2,967,665,000)
Net deferred tax liability	(1,491,886,000)		(2,226,897,000)
Current deferred income tax liability	(19,169,000)		(86,481,000)
Non-current deferred income tax liability	(1,472,717,000)		(2,140,416,000)
UNITED STATES
Income Tax Disclosure [Abstract]
Net operating loss carryforward	917,400,000
COLORADO
Income Tax Disclosure [Abstract]
Net operating loss carryforward	122,000,000
KANSAS
Income Tax Disclosure [Abstract]
Net operating loss carryforward	50,600,000
Valuation allowances	(1,500,000)
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration	$ 32,000,000

[1] Net operating loss carryforwards as of December 31, 2013 consist of $917.4 million of U.S. federal NOLs which expire primarily in 2032, $122.0 million of Colorado NOLs which expire between 2027 and 2033 and $50.6 million of Kansas NOLs which expire between 2018 and 2023.

[2] Net operating loss carryforwards as of December 31, 2013 are net of a $1.5 million valuation allowance relating to $32 million of Kansas NOLs that the Company believes will more likely than not expire unutilized.

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Income Taxes (Income Tax (Provision) Benefit Attributable To Income From Continuing Operations) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
U.S. federal	$ (10,406)	$ (5,575)	$ 0
U.S. state	44	1,316	(6,948)
Foreign	(237)	0	0
Current income tax (provision) benefit	(10,599)	(4,259)	(6,948)
U.S. federal	201,060	(272,289)	(179,699)
U.S. state	21,314	(13,940)	(1,631)
Deferred income tax (provision) benefit	222,374	(286,229)	(181,330)
Income tax (provision) benefit	$ 211,775	$ (290,488)	$ (188,278)

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Document And Entity Information (USD $)	12 Months Ended
	Dec. 31, 2013	Feb. 20, 2014	Jun. 30, 2013
Document And Entity Information [Abstract]
Entity Registrant Name	Pioneer Natural Resources Company
Trading Symbol	PXD
Entity Central Index Key	0001038357
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-K
Document Period End Date	Dec. 31, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Common Stock, Shares Outstanding		142,916,619
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 19,865,703,072

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Commitments And Contingencies

12 Months Ended

Dec. 31, 2013

Commitments and Contingencies Disclosure [Abstract]

Commitments And Contingencies

NOTE J. Commitments and Contingencies

Severance agreements. The Company has entered into severance and change in control agreements with its officers and certain key employees. The current annual salaries for the officers and key employees covered under such agreements total $43.2 million.

Indemnifications. The Company has agreed to indemnify its directors and certain of its officers, employees and agents with respect to claims and damages arising from acts or omissions taken in such capacity, as well as with respect to certain litigation.

Legal actions. The Company is party to various proceedings and claims incidental to its business. While many of these matters involve inherent uncertainty, the Company believes that the amount of the liability, if any, ultimately incurred with respect to such other proceedings and claims will not have a material adverse effect on the Company's consolidated financial position as a whole or on its liquidity, capital resources or future annual results of operations. The Company records reserves for contingencies when information available indicates that a loss is probable and the amount of the loss can be reasonably estimated.

Lawsuits filed in state and federal courts in Texas relating to the Pioneer Southwest merger. On May 15, 2013, David Flecker, a purported unitholder of Pioneer Southwest, filed a class action petition on behalf of Pioneer Southwest's unitholders and a derivative suit on behalf of Pioneer Southwest against the Company, Pioneer USA, the General Partner and the directors of the General Partner, in the 134th Judicial District of Dallas County, Texas (the "Flecker Lawsuit"). A similar class action petition and derivative suit was filed against the same defendants on May 20, 2013, in the 160th Judicial District of Dallas County, Texas, by purported unitholder Vipul Patel (the "Patel Lawsuit"). On September 3, 2013, the court consolidated the Patel Lawsuit into the Flecker Lawsuit (as consolidated, the "Texas State Court Lawsuit"), and the plaintiffs filed a consolidated derivative and class action petition on September 5, 2013.

The Texas State Court Lawsuit alleges, among other things, that the consideration offered by the Company in the Pioneer Southwest merger was unfair and inadequate and that, by pursuing a transaction that was the result of an allegedly conflicted and unfair process, the defendants breached their duties under Pioneer Southwest's partnership agreement as well as the implied covenant of good faith and fair dealing, and engaged in self-dealing. Specifically, the lawsuit alleges that the director defendants: (i) engaged in self-dealing, failed to act in good faith toward Pioneer Southwest, and breached their duties owed to Pioneer Southwest; (ii) failed to properly value Pioneer Southwest and its various assets and operations and ignored or failed to protect against the numerous conflicts of interest arising out of the proposed transaction; and (iii) breached the implied covenant of good faith and fair dealing by engaging in a flawed merger process. The Texas State Court Lawsuit also alleges that the Company, Pioneer USA and the General Partner aided and abetted the director defendants in their purported breach of fiduciary duties. Based on these allegations, the plaintiffs in the Texas State Court Lawsuit seek to have the Pioneer Southwest merger rescinded. The plaintiffs also seek money damages and attorneys' fees. The defendants have filed a motion to dismiss the Texas State Court Lawsuit based on improper forum.

In September 2013, representatives of the plaintiffs in the Texas State Court Lawsuit and the defendants entered into a memorandum of understanding (the "Memorandum of Understanding") to settle the claims and allegations made in the lawsuit. The Memorandum of Understanding provided the plaintiffs with a period of confirmatory discovery during which the plaintiffs could confirm the fairness and reasonableness of the settlement contemplated by the Memorandum of Understanding. As part of the consideration for the settlement, the Merger Agreement was amended to provide for contractual appraisal rights for the unitholders. The parties to the Memorandum of Understanding agreed to use their reasonable best efforts to obtain the agreement of any plaintiffs filing similar lawsuits to become party to the Memorandum of Understanding and the related settlement, and it is a condition to the consummation of the final settlement that any such plaintiffs join the settlement or such similar lawsuits otherwise be dismissed with prejudice prior to the final approval of the settlement.

On January 7, 2014, the defendants and representatives of the plaintiffs in the Texas State Court Lawsuit entered into a stipulation of settlement (the "Stipulation of Settlement"). The Stipulation of Settlement provides for a full and complete discharge, dismissal with prejudice, settlement and release of all claims, suits and causes of action by the plaintiffs (other than appraisal rights under the Merger Agreement) against the defendants and their representatives arising out of or relating to the allegations made in the Texas State Court Lawsuit and the Federal Lawsuits (as defined below), the Pioneer Southwest merger or any deliberations, negotiations, disclosures, omissions, press releases, statements or misstatements in connection therewith, any fiduciary or other obligations in respect of the merger or any alternative transaction or under Pioneer Southwest's partnership agreement, or any costs and expenses associated with settlement other than as provided in the Stipulation of Settlement.

On January 11, 2014, the 134th Judicial District, Dallas County, Texas (the "Court") entered a Preliminary Approval Order providing for, among other things, the scheduling of a settlement hearing to be held before the Court, George L. Allen, Sr. Courts Building, 600 Commerce Street, 6th Floor West (Old), Dallas, TX 75202, on March 17, 2014, at 9:30 a.m; the certification, for settlement purposes only, of a Class consisting of all persons who held Pioneer Southwest common units, either of record or beneficially, at any time during the period from and including May 6, 2013 to and including December 17, 2013, the date of consummation of the Pioneer Southwest merger, including any and all of their respective successors-in-interest, predecessors, representatives, trustees, executors, administrators, heirs, assigns, or transferees, and any person or entity acting for or on behalf of, or claiming under, any of them, and specifically including plaintiffs, but excluding defendants, their subsidiary companies, affiliates, assigns, members of their immediate families, and the legal representatives, heirs, successors, or assigns of any such excluded person. All proceedings relating to the allegations made in the Texas State Court Lawsuit other than with respect to the settlement have been stayed, and the Court entered an injunction against the commencement or prosecution of any action by any member of the Class asserting any of the claims subject to the settlement. There can be no assurance that a final settlement will be approved.

Former lawsuits relating to the Pioneer Southwest merger that have been dismissed

United States District Court for the Northern District of Texas. On August 21, 2013, Allan H. Beverly, a purported unitholder, filed a class action complaint against Pioneer Southwest, the Company, Pioneer USA, MergerCo and the directors of the General Partner in the United States District Court for the Northern District of Texas (the "Beverly Lawsuit"). On September 13, 2013, Douglas Shelton, another purported unitholder, filed a class action complaint against the same defendants in the Beverly Lawsuit (as well as the General Partner) in the same court as the Beverly Lawsuit (the "Shelton Lawsuit" and with the Beverly Lawsuit, the “Federal Lawsuits”). The Beverly Lawsuit alleged that the defendants breached their fiduciary duties by agreeing to the merger by means of an unfair process and for an unfair price. Specifically, the lawsuit alleged that the director defendants: (i) failed to maximize the value of Pioneer Southwest to its public unitholders and took steps to avoid competitive bidding; (ii) failed to properly value Pioneer Southwest; and (iii) ignored or failed to protect against the numerous conflicts of interest arising out of the proposed transaction. The Beverly Lawsuit also alleged that the Company, Pioneer USA and MergerCo aided and abetted the director defendants in their purported breach of fiduciary duties. The Shelton Lawsuit made similar allegations to the Beverly Lawsuit, specifically: (i) that the Company, as controlling unitholder, failed to fulfill its fiduciary duties in connection with the merger because it purportedly could not establish that the proposed merger was the result of a fair process that would return a fair price to the unaffiliated unitholders of Pioneer Southwest; (ii) that the director defendants breached their fiduciary duties by failing to exercise due care and diligence in connection with the proposed merger because the proposed merger was purportedly not the result of a fair process that will return a fair price to the unaffiliated unitholders; and (iii) that the non-director defendants aided and abetted the director defendants in their purported breach of fiduciary duties. The plaintiffs in the Federal Lawsuits sought the same remedies as the plaintiffs in the Texas State Court Lawsuit. The representatives of the plaintiffs in the Federal Lawsuits are also parties to the Memorandum of Understanding. In accordance with the Memorandum of Understanding, the plaintiffs in the Beverly Lawsuit voluntarily dismissed all claims in the lawsuit on October 15, 2013, and the plaintiffs in the Shelton Lawsuit voluntarily dismissed all claims in the lawsuit on October 16, 2013.

Delaware Court of Chancery. On September 23, 2013, Patrick Wilson, another purported unitholder, filed a class action petition on behalf of the unitholders against Pioneer USA, MergerCo, Pioneer Southwest, the General Partner and the directors of the General Partner in the Court of Chancery of the State of Delaware (the "Wilson Lawsuit"). The Wilson Lawsuit alleged that the director defendants breached their purported fiduciary obligations to the unitholders by engaging in a process that undervalued Pioneer Southwest and which allegedly constituted gross negligence, recklessness, willful misconduct, bad faith or knowing violations of law. Additionally, the Wilson Lawsuit alleged that the non-director defendants aided and abetted the purported breaches of fiduciary duties of the director defendants. The Wilson Lawsuit sought the same remedies as the plaintiffs in the Texas State Court Lawsuit and the Federal Lawsuits. The plaintiff in the Wilson Lawsuit voluntarily dismissed that action on January 2, 2014. After participating in and receiving confirmatory discovery, the plaintiff in the Wilson Action has informed representatives of the plaintiffs in the Texas State Court Lawsuit that he intends to participate as a class member in the settlement.

The Company cannot predict the outcome of these or any other lawsuits that might be filed subsequent to the date of the filing of this Report, nor can the Company predict the amount of time and expense that will be required to resolve these lawsuits. See Note C for a description of the Merger Agreement.

Obligations following divestitures. In April 2006, the Company provided the purchaser of its Argentine assets certain indemnifications. The Company remains responsible for certain contingent liabilities related to such indemnifications, subject to defined limitations, including matters of litigation, environmental contingencies, royalty obligations and income taxes. The Company has also retained certain liabilities and indemnified buyers for certain matters in connection with other divestitures, including the sale of its Canadian assets in 2007, the sale of Pioneer Tunisia in February 2011, the sale of Pioneer South Africa in August 2012, the planned sale of Alaska in 2014 and in connection with sales of joint interests. The Company does not believe that these obligations are probable of having a material impact on its liquidity, financial position or future results of operations.

Drilling commitments. The Company periodically enters into contractual arrangements under which the Company is committed to expend funds to drill wells in the future. The Company also enters into agreements to secure drilling rig services, which require the Company to make future minimum payments to the rig operators. The Company records drilling commitments in the periods in which the well is drilled or rig services are performed.

Lease agreements. The Company leases equipment and office facilities under operating leases. Rent expense for the years ended December 31, 2013, 2012 and 2011 were $57.9 million, $48.0 million and $35.2 million, respectively. These payments include $9.8 million, $7.9 million and $5.7 million associated with discontinued operations for the years ended December 31, 2013, 2012 and 2011, respectively, which are included in earnings from discontinued operations, net of tax, in the accompanying consolidated statements of operations.

Future minimum lease commitments under noncancelable operating leases at December 31, 2013 are as follows (in thousands):

2014	$	25,305
2015	$	18,495
2016	$	16,135
2017	$	15,637
2018	$	15,418
Thereafter	$	26,569

Gathering, processing, transportation and fractionation agreements. The Company from time to time enters into, and as of December 31, 2013 is a party to, contractual commitments with midstream service companies and pipeline carriers for future gathering, processing, transportation and fractionation. These commitments are normal and customary for the Company's business activities. Future minimum gathering, processing, transportation and fractionation commitments at December 31, 2013 are as follows (in thousands):

2014	$	353,167
2015	$	404,493
2016	$	418,665
2017	$	282,077
2018	$	245,250
Thereafter	$	773,868

Certain future minimum gathering, processing, transportation and fractionation fees are based upon rates and tariffs subject to change over the lives of the commitments. The above commitments include demand fees associated with volume delivery commitments of up to 50,000 BOEPD through August 2017 that are related to the Company's Permian Basin operations. The Company does not expect to be able to fulfill all of its short-term and long-term delivery obligations from projected production of available reserves; consequently, the Company plans to purchase third party volumes to satisfy its commitment if it is economical to do so; otherwise, it will pay demand fees for commitment shortfalls.

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Commitments And Contingencies (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Commitments And Contingencies [Line Items]
Current annual salaries of officers and key employees	$ 43.2
Lease payments associated with operating leases	57.9	48.0	35.2
Lease Payments Discontinued Operations [Member]
Commitments And Contingencies [Line Items]
Lease payments associated with operating leases	$ 9.8	$ 7.9	$ 5.7

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Income Taxes (Schedule Of Income Tax (Provision) Benefit Allocation) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Income tax benefit (provision)	$ 211,775	$ (290,488)	$ (188,278)
Income tax from discontinued operations	250,882	182,437	(267,314)
Changes in goodwill - tax benefits related to stock-based compensation	0	0	40
Net deferred hedge gains	0	(1,725)	8,407
Tax benefits related to stock-based compensation	17,639	58,486	31,087
Income Tax Effects Allocated Directly to Equity, Equity Transactions	38,415	0	0
Deferred tax benefit associated with the Pioneer Southwest merger	200,091
Decrease in noncontrolling interest, tax impact		0	0
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Issuance of Equity by Subsidiary to Noncontrolling Interests, Tax Impact	0		0
Deferred tax provision attributable to 2008 Pioneer Southwest initial public offering		(49,072)
Tax attributable to issuance of common units	0	0	(23,711)
Tax on Pioneer Southwest common units sold by the Company on December 12, 2011	$ 0	$ 0	$ (15,381)

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Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
Revenues and other income:
Oil and gas	$ 3,155,696		$ 2,575,311	$ 2,080,215
Sales of purchased oil and gas	333,822		122,093	14,542
Interest and other	16,961		(1,032)	29,382
Derivative gains, net	4,010		330,251	392,752
Gain (Loss) on disposition of assets, net	209,021		45,898	(3,644)
Revenues and other income	3,719,510		3,072,521	2,513,247
Costs and expenses:
Oil and gas production	614,676		558,045	396,961
Production and ad valorem taxes	201,186		178,723	139,425
Depletion, depreciation and amortization	907,077		708,270	489,579
Purchased oil and gas	335,734		120,408	13,949
Impairment of oil and gas properties	1,495,242		0	354,408
Exploration and abandonments	98,448		98,285	80,691
General and administrative	295,868		244,196	189,985
Accretion of discount on asset retirement obligations	11,862		8,677	7,506
Interest	183,750		204,222	181,604
Other	137,386		114,175	63,071
Costs and expenses, Total	4,281,229		2,235,001	1,917,179
Income (loss) from continuing operations before income taxes	(561,719)		837,520	596,068
Income tax benefit (provision)	211,775		(290,488)	(188,278)
Income (loss) from continuing operations	(349,944)		547,032	407,790
Income (loss) from discontinued operations, net of tax	(449,605)		(304,210)	474,124
Net income (loss)	(799,549)		242,822	881,914
Net income attributable to noncontrolling interests	(38,865)		(50,537)	(47,425)
Net income (loss) attributable to common stockholders	(838,414)		192,285	834,489
Basic earnings per share:
Income (loss) from continuing operations attributable to common stockholders	$ (2.86)		$ 4.02	$ 3.03
Income (loss) from discontinued operations attributable to common stockholders	$ (3.30)		$ (2.48)	$ 3.98
Net income (loss) attributable to common stockholders	$ (6.16)		$ 1.54	$ 7.01
Diluted earnings per share:
Income (loss) from continuing operations attributable to common stockholders	$ (2.86)		$ 3.91	$ 2.97
Income (loss) from discontinued operations attributable to common stockholders	$ (3.30)		$ (2.41)	$ 3.91
Net income (loss) attributable to common stockholders	$ (6.16)		$ 1.50	$ 6.88
Weighted average shares outstanding:
Basic	136,130	[1]	122,966	116,904
Diluted	136,130	[1]	126,320	119,215
Amounts attributable to common stockholders:
Income (loss) from continuing operations, net of tax	(388,809)		496,495	360,365
Income (loss) from discontinued operations, net of tax	(449,605)		(304,210)	474,124
Net income (loss)	$ (838,414)		$ 192,285	$ 834,489

[1] (a)The following common share equivalents were excluded from the weighted average diluted shares for the year ended December 31, 2013 because they would have been anti-dilutive to the loss recorded for the period: (i) 135,190 outstanding options to purchase the Company's common stock, (ii) 200,360 common shares attributable to unvested performance awards and (iii) 1,087,401 common shares related to the 2013 redemption of the Convertible Senior Notes, representing the weighted average portion of the year that is not included in the basic weighted average common shares outstanding.

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Disclosures About Fair Value Measurements

12 Months Ended

Dec. 31, 2013

Fair Value Disclosures [Abstract]

Disclosures About Fair Value Measurements

NOTE D.    Fair Value Measurements

Fair value is defined as the price that would be received to sell an asset or the price paid to transfer a liability in an orderly transaction between market participants at the measurement date. Fair value measurements are based upon inputs that market participants use in pricing an asset or liability, which are characterized according to a hierarchy that prioritizes those inputs based on the degree to which they are observable. Observable inputs represent market data obtained from independent sources, whereas unobservable inputs reflect a company's own market assumptions, which are used if observable inputs are not reasonably available without undue cost and effort. The three input levels of the fair value hierarchy are as follows:

• Level 1 – quoted prices for identical assets or liabilities in active markets.

• Level 2 – quoted prices for similar assets or liabilities in active markets; quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability (e.g. interest rates) and inputs derived principally from or corroborated by observable market data by correlation or other means.

• Level 3 – unobservable inputs for the asset or liability.

Assets and liabilities measured at fair value on a recurring basis. The fair value input hierarchy level to which an asset or liability measurement in its entirety falls is determined based on the lowest level input that is significant to the measurement in its entirety.

The following tables present the Company's assets and liabilities that are measured at fair value on a recurring basis as of December 31, 2013 and 2012 for each of the fair value hierarchy levels:

	Fair Value Measurements at the End of the Reporting Period Using
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Fair Value at December 31, 2013
	(in thousands)
Assets:
Trading securities	$	136	$	146	$	—	$	282
Commodity derivatives	—		156,561		—		156,561
Interest rate derivatives	—		9,530		—		9,530
Deferred compensation plan assets	63,971		—		—		63,971
Total assets	64,107		166,237		—		230,344
Liabilities:
Commodity derivatives	—		11,626		—		11,626
Interest rate derivatives	—		9,933		—		9,933
Total liabilities	—		21,559		—		21,559
Total recurring fair value measurements	$	64,107	$	144,678	$	—	$	208,785

	Fair Value Measurements at the End of the Reporting Period Using
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Fair Value at December 31, 2012
	(in thousands)
Assets:
Trading securities	$	124	$	154	$	—	$	278
Commodity derivatives	—		334,376		—		334,376
Deferred compensation plan assets	49,685		—		—		49,685
Total assets	49,809		334,530		—		384,339
Liabilities:
Commodity derivatives	—		15,999		—		15,999
Interest rate derivatives	—		9,724		—		9,724
Total liabilities	—		25,723		—		25,723
Total recurring fair value measurements	$	49,809	$	308,807	$	—	$	358,616

Trading securities and deferred compensation plan assets. The Company's trading securities are comprised of securities that are both actively traded and not actively traded on major exchanges. The Company's deferred compensation plan assets represent investments in equity and mutual fund securities that are actively traded on major exchanges. These investments are measured based on observable prices on major exchanges. As of December 31, 2013 and 2012, substantially all of the significant inputs to these asset exchange values represented Level 1 independent active exchange market price inputs. Inputs for certain trading securities that are not actively traded on major exchanges were classified as Level 2 inputs.

Commodity derivatives.The Company's commodity derivatives represent oil, NGL and gas swap contracts, collar contracts and collar contracts with short puts. The Company's asset and liability measurements for its oil, NGL and gas swap, collar and collar contracts with short puts represent Level 2 inputs in the hierarchy priority. The Company utilizes discounted cash flow and option-pricing models for valuing its commodity derivatives.

The asset and liability values attributable to the Company's commodity derivatives were determined based on inputs which include (i) the contracted notional volumes, (ii) independent active market price quotes, (iii) the applicable estimated credit-adjusted risk-free rate yield curve and (iv) the implied rate of volatility inherent in the collar and collar contracts with short puts, which is based on active and independent market-quoted volatility factors.

Interest rate derivatives. The Company's interest rate derivative assets and liabilities as of December 31, 2013 and 2012 represent interest rate swap contracts. The Company utilizes discounted cash flow models for valuing its interest rate derivatives. The net derivative values attributable to the Company's interest rate derivative contracts as of December 31, 2013 and 2012 are based on (i) the contracted notional amounts, (ii) LIBOR rate yield curves provided by counterparties and corroborated with forward active market-quoted LIBOR yield curves and (iii) the applicable credit-adjusted risk-free rate yield curve. The Company's interest rate derivative liability measurements represent Level 2 inputs in the hierarchy priority.

Assets and liabilities measured at fair value on a nonrecurring basis. Certain assets are measured at fair value on a nonrecurring basis. These assets are not measured at fair value on any ongoing basis, but are subject to fair value adjustments in certain circumstances. These assets can include long-lived assets that have been reduced to fair value when they are held for sale, inventory and proved and unproved oil and gas properties that are written down to fair value when they are impaired.

Proved oil and gas properties. During 2013, 2012 and 2011, reductions in management's longer-term commodity price outlooks ("Management's Price Outlooks") provided indications of possible impairment of the Company's predominately dry gas properties in the Raton field in southeastern Colorado, the Barnett Shale field in North Texas and the Edwards Trend and Austin Chalk fields in South Texas. As a result of management's assessments, during the years ended December 31, 2013, 2012 and 2011, the Company recognized impairment charges to reduce the carrying values of the Raton field, the Barnett Shale field and the Edwards Trend/Austin Chalk fields, respectively, to their estimated fair values. The impairment charge associated with the Barnett Shale field is reported in income (loss) from discontinued operations, net of tax in the accompanying consolidated statements of operations.

The Company calculated the fair values of the Raton field, the Barnett Shale field and the Edwards Trend/Austin Chalk fields proved properties using a discounted cash flow model. Significant Level 3 assumptions associated with the calculation of discounted future cash flows included Management's Price Outlooks and management's outlooks for (i) production costs, (ii) capital expenditures, (iii) production and (iv) estimated proved reserves and risk-adjusted probable reserves. Management's Price Outlooks are developed based on third-party longer-term commodity futures price outlooks as of each measurement date. The expected future net cash flows were discounted using an annual rate of 10 percent to determine fair value.

The following table presents the fair value and fair value adjustments (in millions) for the Company's 2013, 2012 and 2011 proved property impairments, as well as the average oil price per barrel ("BBL") and gas price per British thermal unit ("MMBTU") utilized in respective Management's Price Outlooks:

	Year ended	Fair		Fair Value			Management's Price Outlooks
	December 31,	Value		Adjustment			Oil		Gas
Edwards Trend/Austin Chalk	2011	$	189.9	$	(354.4	)	$	92.69	$	5.14
Barnett Shale	2012	$	184.8	$	(532.6	)	$	87.09	$	4.78
Raton	2013	$	533.6	$	(1,495.2	)	$	80.40	$	4.43

It is reasonably possible that the estimate of undiscounted future net cash flows attributable to these or other properties may change in the future resulting in the need to impair their carrying values. The primary factors that may affect estimates of future cash flows are (i) future adjustments, both positive and negative, to proved and appropriate risk-adjusted probable and possible oil and gas reserves, (ii) results of future drilling activities, (iii) Management's Price Outlooks and (iv) increases or decreases in production and capital costs associated with these fields.

Assets classified as held for sale. The Company records assets classified as held for sale at the lower of the asset's carrying amount or estimated fair value less costs to sell. The fair value of Pioneer Alaska is based on an estimated sale price based on ongoing negotiations, less costs to sell, and is further supported by the Company's discounted cash flow model for the Alaska proved properties using Level 3 inputs as discussed in the proved oil and gas properties section above. The fair value of the Barnett Shale field assets is based upon a weighted average calculation that uses management inputs including an estimated sales price and a discounted cash flow model for the proved properties using Level 3 assumptions as discussed in the proved oil and gas properties section above. The fair value of the Sendero assets are based upon anticipated sales proceeds less costs to sell, which represent a Level 3 input in the hierarchy priority.  See Note C for additional information regarding the Company's planned divestitures.

The following table presents the estimated fair value less costs to sell and fair value adjustments for the Company's assets classified as held for sale as of December 31, 2013:

	Estimated Fair Value Less Costs to Sell		Fair Value Adjustment
	(in millions)
Discontinued operations held for sale - Alaska	$	350.6	$	(539.8	)
Discontinued operations held for sale - Barnett Shale field	$	180.4	$	(189.5	)
Other long-lived assets held for sale - Sendero	$	31.4	$	(25.5	)

Unproved oil and gas properties. During December 2012, the Company recorded an impairment charge to reduce the carrying value of unproved properties in the Barnett Shale field of $71.8 million (reported in income (loss) from discontinued operations, net of tax in the accompanying consolidated statements of operations). The Company calculated the estimated fair value of the Barnett Shale unproved properties using significant Level 3 assumptions based on average lease bonuses per acre for its Barnett liquid-rich acreage, allocating no value to dry gas acreage as the Company does not intend to develop that acreage.

Inventories. During December 2013, the Company recorded an impairment charge of $23.2 million to reduce the carrying value of its excess vertical well pipe inventory. The Company calculated the estimated fair value of the inventory using significant Level 2 assumptions based on third-party price quotes for the asset in an active market. The impairment charge is included in other expense on the Company's accompanying consolidated statements of operations.

Financial instruments not carried at fair value. Carrying values and fair values of financial instruments that are not carried at fair value in the consolidated balance sheet as of December 31, 2013 and 2012 are as follows:

	December 31, 2013				December 31, 2012
	Carrying Value		Fair Value		Carrying Value		Fair Value
	(in thousands)
Long-term debt	$	2,653,059	$	3,018,830	$	3,721,193	$	4,555,770

Long-term debt includes the Company's credit facility and the Company's senior notes. At December 31, 2012, long-term debt also included Pioneer Southwest's credit facility and the Company's 2.875% Convertible Senior Notes due 2038 ("Convertible Senior Notes"), which were both fully extinguished during 2013. The fair value of debt is determined utilizing inputs that are Level 2 measurements in the fair value hierarchy.

Credit facilities. The fair values of the Company's and, through the date of the merger, Pioneer Southwest's credit facilities are calculated using a discounted cash flow model based on (i) forecasted contractual interest and fee payments, (ii) forward active market-quoted United States Treasury Bill rate (in the case of the Company's credit facility) or LIBOR (in the case of Pioneer Southwest's credit facility) yield curves and (iii) the applicable credit-adjustments.

Senior notes. The Company's senior notes represent debt securities that are not actively traded on major exchanges. The fair values of the Company's senior notes are based on their periodic values as quoted on the major exchanges.

The Company has other financial instruments consisting primarily of cash equivalents, receivables, prepaid expenses, payables and other current assets and liabilities that approximate fair value due to the nature of the instrument and relatively short maturities. Non-financial assets and liabilities initially measured at fair value include certain assets acquired and liabilities assumed in a business combination, goodwill and asset retirement obligations.

Concentrations of credit risk. As of December 31, 2013, the Company's primary concentration of credit risks are the risks of collecting accounts receivable – trade and the risk of counterparties' failure to perform under derivative obligations. See Note L for information regarding the Company's major customers.

The Company has entered into International Swap Dealers Association Master Agreements ("ISDA Agreements") with each of its derivative counterparties. The terms of the ISDA Agreements provide the Company and the counterparties with rights of set off upon the occurrence of defined acts of default by either the Company or a counterparty to a derivative, whereby the party not in default may set off all derivative liabilities owed to the defaulting party against all derivative asset receivables from the defaulting party. See Note E for additional information regarding the Company's derivative activities and information regarding derivative net assets and liabilities by counterparty.

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Acquisitions and Divestitures

12 Months Ended

Dec. 31, 2013

Business Combinations [Abstract]

Acquisition and Divestitures [Text Block]

NOTE C. Acquisitions and Divestitures

Pioneer Southwest Merger Transaction

On December 17, 2013, the Company completed the acquisition of all of the outstanding common units of Pioneer Southwest not already owned by the Company, through a merger of a wholly-owned subsidiary of the Company into Pioneer Southwest, the result of which was that Pioneer Southwest became a wholly-owned subsidiary of the Company. The merger was effected pursuant to an Agreement and Plan of Merger dated August 9, 2013, as amended on October 25, 2013 (as amended, the "Merger Agreement"), and was approved by the holders of the common units of Pioneer Southwest at a special meeting held on December 17, 2013.

Pursuant to the Merger Agreement, all of the common units outstanding as of the closing of the merger except for the common units owned by the Company, were canceled and converted into the right to receive 0.2325 of a share of common stock of the Company per common unit (the "Conversion Ratio"). In lieu of receiving any fractional share of common stock to which any holder of the Pioneer Southwest's common units would otherwise have been entitled, after aggregating all fractions of shares to which such holder would be entitled, any fractional share was rounded up to a whole share of common stock of the Company. Consequently, in December 2013, the Company issued an aggregate of 3.96 million shares of its common stock to Pioneer Southwest unitholders. The merger is expected to facilitate the Company's plans to fully and optimally develop the Company's properties in the Midland Basin in West Texas utilizing horizontal drilling and is expected to enhance the Company's organizational, operational and administrative efficiencies.

On December 18, 2013, the Company caused Pioneer Southwest, its general partner and all of Pioneer Southwest's subsidiaries to be merged with and into a wholly-owned subsidiary of the Company, the result of which was that all common units of Pioneer Southwest were canceled and the Company no longer holds any common units.

Premier Silica Business Combination

On April 2, 2012, a wholly-owned subsidiary of the Company acquired an industrial sand mining business that is now named Premier Silica LLC ("Premier Silica"). Premier Silica's primary mine operations are in Brady, Texas. The Brady mine facilities primarily produce, process and provide sand to the Company for use as proppant in its fracture stimulation of oil and gas wells in Texas. Premier Silica's sand production that is in excess of the Company's sand needs for fracture stimulation and sand production that is not usable for fracture stimulation is primarily sold to third parties for industrial and recreational purposes. The aggregate purchase price of Premier Silica was $297.1 million, including closing adjustments.

Divestitures Recorded in Continuing Operations

During December 2013, the Company committed to a plan to sell the Company's majority interest in Sendero to Sendero's minority interest owner for $31.0 million, subject to negotiating a definitive sales agreement and the buyer completing its financing arrangements. Associated with the planned sale of Sendero, the Company recorded a noncash loss of $25.5 million in other expense during December 2013 to reduce the carrying value of Sendero's net assets to their estimated fair value. As part of the sales negotiations, the Company plans to commit to lease 12 Sendero rigs through December 31, 2015, and to lease eight Sendero rigs in 2016. The Company has classified Sendero assets and liabilities as held for sale in the accompanying consolidated balance sheet as of December 31, 2013.

The Company recorded net gains on disposition of assets in continuing operations of $209.0 million and $45.9 million during the years ended December 31, 2013 and 2012, respectively, and a net loss on disposition of assets in continuing operations of $3.6 million during the year ended December 31, 2011. The following describes the significant divestitures included in continuing operations:

• Southern Wolfcamp. In January 2013, the Company signed an agreement with Sinochem Petroleum USA LLC ("Sinochem"), a U.S. subsidiary of the Sinochem Group, an unaffiliated third party, to sell 40 percent of Pioneer's interest in 207,000 net acres leased by the Company in the horizontal Wolfcamp Shale play in the southern portion of the Spraberry field in West Texas for total consideration of $1.8 billion, including normal closing adjustments. In May 2013, the Company completed the sale to Sinochem for net cash proceeds of $623.8 million, including normal closing adjustments, resulting in a gain of $181.3 million related to the unproved property interests conveyed to Sinochem. Sinochem is paying the remaining $1.2 billion of the transaction price by carrying 75 percent of Pioneer's portion of ongoing drilling and facilities costs attributable to the Company's joint operations with Sinochem in the horizontal Wolfcamp Shale play.

• West Panhandle. During the first quarter of 2013, the Company completed a sale of its interest in unproved oil and gas properties adjacent to the Company's West Panhandle field operations for net cash proceeds of $38.1 million, which resulted in a gain of $22.4 million,

• Eagle Ford Shale. In January 2012, the Company sold a portion of its interest in an unproved oil and gas property in the Eagle Ford Shale play to unaffiliated third parties for cash proceeds of $54.7 million, which resulted in a gain of $42.6 million.

• Other. During 2013, 2012 and 2011, the Company sold other proved and unproved properties, inventory and other property and equipment and recorded net gains of $5.3 million and $3.3 million during 2013 and 2012, respectively, and a net loss of $3.6 million during 2011.

Discontinued Operations

Alaska. During the fourth quarter of 2013, the Company committed to a plan to sell 100 percent of the capital stock in Pioneer's Alaska subsidiary, representing all the Company's net assets in Alaska ("Pioneer Alaska"). The sale of Pioneer Alaska continues to be subject to ongoing negotiations and certain other conditions, such as governmental approvals and buyer's arrangement of financing.

The Company has classified (i) Pioneer Alaska assets and liabilities as held for sale in the accompanying consolidated balance sheet as of December 31, 2013 and (ii) Pioneer Alaska results of operations as income (loss) from discontinued operations, net of tax in the accompanying consolidated statements of operations (including a recasting of the Pioneer Alaska results of operations for the years ended December 31, 2012 and 2011, which were originally classified as continuing operations).

Associated with the planned sale of Pioneer Alaska, the Company recorded a noncash impairment charge of $539.8 million in discontinued operations during December 2013 to reduce the carrying value of Pioneer Alaska to its estimated fair value less costs to sell of $350.6 million. See Note D for additional information about the Pioneer Alaska impairment charge. The recasting of Pioneer Alaska results includes the sale of the Company's interest in the Cosmopolitan Unit in the Cook Inlet of Alaska in August 2012 to unaffiliated third parties for cash proceeds of $10.1 million, which, together with certain Company obligations assumed by the purchasers, resulted in a gain of $12.6 million.

Barnett Shale. During the fourth quarter of 2013, the Company committed to a plan to divest of its net assets in the Barnett Shale field in North Texas. The plan is expected to result in the sale of the Barnett Shale net assets during 2014. The Company has classified its (i) Barnett Shale assets and liabilities as held for sale in the accompanying consolidated balance sheet as of December 31, 2013 and (ii) Barnett Shale results of operations as income (loss) from discontinued operations, net of tax in the accompanying consolidated statements of operations (including a recasting of the Barnett Shale results of operations for the years ended December 31, 2012 and 2011, which were originally classified as continuing operations).

Associated with the Company's plan to sell its net assets in the Barnett Shale field, the Company recorded a noncash impairment charge of $189.5 million in discontinued operations in December 2013 to reduce the carrying value of its net assets in the Barnett Shale field to their estimated fair value less costs to sell. See Note D for more information about the impairment of Barnett Shale net assets. Also included in discontinued operations in 2013 is the sale of the Company's interest in certain proved and unproved oil and gas properties in the Barnett Shale field for net cash proceeds of $33.8 million, which resulted in a gain of $8.7 million on the unproved properties sold.

The Company's plans to sell Pioneer Alaska and the Barnett Shale net assets are in differing stages of marketing and negotiation. No assurance can be given that the sales will be completed in accordance with the Company's plans.

South Africa. In December 2011, the Company committed to a plan to exit South Africa and initiated a process to divest its net assets in South Africa ("Pioneer South Africa"). During the first quarter of 2012, the Company agreed to sell its net assets in Pioneer South Africa to an unaffiliated third party, effective January 1, 2012, for $60.0 million of cash proceeds before normal closing and other adjustments, and the buyer's assumption of certain liabilities of the Company's South Africa subsidiaries. In August 2012, the Company completed the sale of Pioneer South Africa for net cash proceeds of $15.9 million, including normal closing adjustments for cash revenues and costs and expenses from the effective date through the date of the sale, resulting in a gain of $28.6 million. The Company classified Pioneer South Africa's results of operations as income from discontinued operations, net of tax in the accompanying consolidated statements of operations.

Tunisia. In February 2011, the Company sold 100 percent of the Company's share holdings in Pioneer Natural Resources Tunisia Ltd. and Pioneer Natural Resources Anaguid Ltd. (referred to in the aggregate as "Pioneer Tunisia") to an unaffiliated third party for cash proceeds of $802.5 million, including normal closing adjustments and excluding cash and cash equivalents sold, resulting in a gain of $645.2 million. Accordingly, the Company has classified the results of operations of Pioneer Tunisia as discontinued operations, net of tax in the accompanying consolidated statements of operations.

The following table represents the components of the Company's discontinued operations for the years ended December 31, 2013, 2012 and 2011:

	Year Ended December 31,
	2013			2012			2011
	(in thousands)
Revenues and other income:
Oil and gas	$	260,503		$	285,542		$	314,124
Interest and other (a)	38,642			29,437			45,145
Gain on disposition of assets, net (b)	8,764			40,735			645,241
	307,909			355,714			1,004,510
Costs and expenses:
Oil and gas production	90,333			79,853			55,698
Production and ad valorem taxes	10,151			9,034			8,239
Depletion, depreciation and amortization (b)	103,787			101,921			130,606
Impairment of oil and gas properties (b) (c)	729,305			532,589			—
Exploration and abandonments	52,707			108,076			44,898
General and administrative	12,261			6,061			13,517
Accretion of discount on asset retirement obligations (b)	831			2,731			3,436
Interest	—			—			829
Other	9,021			2,096			5,849
	1,008,396			842,361			263,072
Income (loss) from discontinued operations before income taxes	(700,487		)	(486,647		)	741,438
Current tax provision	(5,591		)	(10,387		)	(46,012		)
Deferred tax (provision) benefit (b)	256,473			192,824			(221,302		)
Income (loss) from discontinued operations	$	(449,605	)	$	(304,210	)	$	474,124

 ____________________

(a) Primarily comprised of Alaskan Petroleum Production Tax credits on qualifying capital expenditures of $38.6 million, $29.3 million and $38.9 million for the years ended December 31, 2013, 2012 and 2011, respectively.

(b) Represents significant noncash components of discontinued operations.

(c) Represents a noncash impairment charge of $539.8 million on Pioneer Alaska net assets during the year ended December 31, 2013 and noncash impairment charges of $189.5 million and $532.6 million during the years ended December 31, 2013 and 2012, respectively, on the Company's net assets in the Barnett Shale field. See Note D for additional information regarding the noncash impairment charges.

As of December 31, 2013, the carrying values of the Company's ownership in Pioneer Alaska, the Barnett Shale field and Sendero were included in assets and liabilities held for sale in the accompanying consolidated balance sheet and were comprised of the following (the Company had no assets held for sale as of December 31, 2012):

	December 31, 2013
	(in thousands)
Composition of assets included in assets held for sale:
Current assets (excluding cash and cash equivalents)	$	57,602
Property, plant and equipment	526,148
Total assets	$	583,750
Composition of liabilities included in liabilities held for sale:
Current liabilities	$	28,771
Other liabilities	9,791
Total liabilities	$	38,562

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Income Taxes

12 Months Ended

Dec. 31, 2013

Income Tax Disclosure [Abstract]

Income Taxes

NOTE O.    Income Taxes

The Company and its eligible subsidiaries file a consolidated United States federal income tax return. Certain subsidiaries are not eligible to be included in the consolidated United States federal income tax return and separate provisions for income taxes have been determined for these entities or groups of entities. The tax returns and the amount of taxable income or loss are subject to examination by United States federal, state, local and foreign taxing authorities. The Company made current and estimated tax payments of $12.4 million, $32.3 million and $22.3 million (net of tax refunds) during 2013, 2012 and 2011, respectively. These payments and net refunds include tax payments related to Pioneer Tunisia's and Pioneer South Africa's operations of $9.8 million and $12.2 million during 2012 and 2011, respectively.

The Company continually assesses both positive and negative evidence to determine whether it is more likely than not that deferred tax assets can be realized prior to their expiration. Pioneer monitors Company-specific, oil and gas industry and worldwide economic factors and assesses the likelihood that the Company's net operating loss carryforwards ("NOLs") and other deferred tax attributes in the United States, state, local and foreign tax jurisdictions will be utilized prior to their expiration.

The Company recognizes the tax benefit from an uncertain tax position only if it is more likely than not that the tax position will be sustained upon examination by the taxing authorities, based upon the technical merits of the position. As of December 31, 2013, the Company had unrecognized tax benefits of $21.2 million resulting from net operating loss carryovers and alternative minimum tax credits obtained from the acquisition of Premier Silica.  The unrecognized tax benefit is recorded as a reduction of the associated deferred tax asset and, if recognized, would affect the annual effective tax rate.  The Company expects to resolve uncertainties regarding the unrecognized tax benefit within twelve months of December 31, 2013.  There were no unrecognized tax benefits as of December 31, 2012.

With respect to income taxes, the Company's policy is to account for interest charges as interest expense and any penalties as other expense in the consolidated statements of operations. The Company files income tax returns in the United States federal jurisdiction, and various state and foreign jurisdictions. As of December 31, 2013, there are no proposed adjustments or uncertain positions in any jurisdiction that would have a significant effect on the Company's future results of operations or financial position. The Company's earliest open years in its key jurisdictions are as follows:

United States	2012
Various U.S. states	2009
South Africa	2008

The Company's income tax (provision) benefit and amounts separately allocated were attributable to the following items for the years ended December 31, 2013, 2012 and 2011:

	Year Ended December 31,
	2013		2012			2011
	(in thousands)
Income tax (provision) benefit from continuing operations	$	211,775	$	(290,488	)	$	(188,278	)
Income tax (provision) benefit from discontinued operations	250,882		182,437			(267,314		)
Changes in goodwill - tax benefits related to stock-based compensation	—		—			40
Changes in stockholders' equity:
Net deferred hedge (loss) gain	—		(1,725		)	8,407
Excess tax benefit related to stock-based compensation	17,639		58,486			31,087
Tax benefit attributable to conversion of 2.875% senior convertible notes	38,415		—			—
Tax benefit attributable to 2013 merger with Pioneer Southwest	200,091		—			—
Tax attributable to 2008 Pioneer Southwest initial public offering	—		(49,072		)	—
Tax attributable to 2009 and 2011 issuance of Pioneer Southwest common units	—		—			(23,711		)
Tax on Pioneer Southwest common units sold by the Company during 2011	—		—			(15,381		)

The Company's income tax (provision) benefit attributable to income from continuing operations consisted of the following for the years ended December 31, 2013, 2012 and 2011:

	Year Ended December 31,
	2013			2012			2011
	(in thousands)
Current:
U.S. federal	$	(10,406	)	$	(5,575	)	$	—
U.S. state	44			1,316			(6,948		)
Foreign	(237		)	—			—
	(10,599		)	(4,259		)	(6,948		)
Deferred:
U.S. federal	201,060			(272,289		)	(179,699		)
U.S. state	21,314			(13,940		)	(1,631		)
	222,374			(286,229		)	(181,330		)
Income tax (provision) benefit from continuing operations	$	211,775		$	(290,488	)	$	(188,278	)

Reconciliations of the United States federal statutory tax rate to the Company's effective tax rate for income (loss) from continuing operations are as follows for the years ended December 31, 2013, 2012 and 2011:

	Year Ended December 31,
	2013			2012			2011
	(in thousands, except percentages)
Income (loss) from continuing operations before income taxes	$	(561,719	)	$	837,520		$	596,068
Less: Net income attributable to noncontrolling interests	(38,865		)	(50,537		)	(47,425		)
Income (loss) from continuing operations attributable to common stockholders before income taxes	(600,584		)	786,983			548,643
Federal statutory income tax rate	35		%	35		%	35		%
(Provision) benefit for federal income taxes	210,204			(275,444		)	(192,025		)
State income tax (provision) benefit (net of federal tax)	13,883			(8,206		)	(5,576		)
Other	(12,312		)	(6,838		)	9,323
Income tax (provision) benefit from continuing operations	$	211,775		$	(290,488	)	$	(188,278	)
Effective income tax rate, excluding income attributable to the noncontrolling interest	35		%	37		%	34		%

The tax effects of temporary differences that give rise to significant portions of the deferred tax assets and deferred tax liabilities related to continuing operations are as follows as of December 31, 2013 and 2012:

	December 31,
	2013			2012
	(in thousands)
Deferred tax assets:
Net operating loss carryforward (a) (b)	$	328,874		$	509,485
Asset retirement obligations	73,623			72,391
Incentive plans	67,990			51,056
Other	74,184			107,836
Total deferred tax assets	544,671			740,768
Deferred tax liabilities:
Oil and gas properties, principally due to differences in basis, depletion and the deduction of intangible drilling costs for tax purposes	(1,569,886		)	(2,322,571		)
Other property and equipment, principally due to the deduction of bonus depreciation for tax purposes	(254,632		)	(263,939		)
Net deferred hedge gains	(108,784		)	(173,097		)
Other	(103,255		)	(208,058		)
Total deferred tax liabilities	(2,036,557		)	(2,967,665		)
Net deferred tax liability	$	(1,491,886	)	$	(2,226,897	)
Reflected in accompanying consolidated balance sheets as:
Current deferred income tax liability	$	(19,169	)	$	(86,481	)
Noncurrent deferred income tax liability	(1,472,717		)	(2,140,416		)
Total	$	(1,491,886	)	$	(2,226,897	)

____________________

(a) Net operating loss carryforwards as of December 31, 2013 consist of $917.4 million of U.S. federal NOLs which expire primarily in 2032, $122.0 million of Colorado NOLs which expire between 2027 and 2033 and $50.6 million of Kansas NOLs which expire between 2018 and 2023.

(b) Net operating loss carryforwards as of December 31, 2013 are net of a $1.5 million valuation allowance relating to $32 million of Kansas NOLs that the Company believes will more likely than not expire unutilized.

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Related Party Transactions

12 Months Ended

Dec. 31, 2013

Related Party Transactions [Abstract]

Related Party Transactions

NOTE K.     Related Party Transactions

The Company, through a wholly-owned subsidiary, (i) serves as operator of properties in which it and its affiliated partnerships have an interest and (ii) owns a noncontrolling interest in its unconsolidated affiliate, EFS Midstream, which it manages. Through these relationships, the Company is a party to transactions with the affiliated partnerships and EFS Midstream that represent related party transactions.

Transactions with affiliated partnerships. The Company receives producing well overhead and other fees related to the operation of the properties in which it and its affiliated partnerships have an interest. The affiliated partnerships also reimburse the Company for their allocated share of general and administrative charges. Reimbursements of fees are recorded as reductions to general and administrative expenses in the Company's consolidated statements of operations.

The related party transactions with affiliated partnerships are summarized below for the years ended December 31, 2013, 2012 and 2011:

	Year Ended December 31,
	2013		2012		2011
	(in thousands)
Receipt of lease operating and supervision charges in accordance with standard industry operating agreements	$	2,502	$	2,437	$	2,104
Reimbursement of general and administrative expenses	$	276	$	342	$	313

Transactions with EFS Midstream. The Company, through a wholly-owned subsidiary, (i) provides certain services as the manager of EFS Midstream in accordance with a Master Services Agreement and (ii) is the operator of Eagle Ford Shale properties for which EFS Midstream provides certain services under a Hydrocarbon Gathering and Handling Agreement (the "HGH Agreement"). During 2013, the Company received $25.1 million in distributions from EFS Midstream.

Master Services Agreement. The terms of the Master Services Agreement provide that the Company will perform certain manager services for EFS Midstream and be compensated by monthly fixed payments and variable payments attributable to expenses incurred by employees whose time is substantially dedicated to EFS Midstream's business. During 2013, 2012 and 2011, the Company received $3.0 million, $2.3 million and $2.2 million of fixed payments and $16.4 million, $11.8 million and $8.4 million of variable payments, respectively, from EFS Midstream. During 2013, the Company purchased other plant and equipment from EFS Midstream totaling $2.8 million. The Company also paid $1.9 million to purchase rights of way from EFS Midstream during 2011.

Hydrocarbon Gathering and Handling Agreement. During June 2010, the Company entered into the HGH Agreement with EFS Midstream. In accordance with the terms of the HGH Agreement, EFS Midstream is obligated to construct certain equipment and facilities capable of gathering, treating and transporting oil and gas production from the Eagle Ford Shale properties operated by the Company. The HGH Agreement also obligates the Company and its Eagle Ford Shale working interest partners to use the EFS Midstream gathering, treating and transportation equipment and facilities. In accordance with the terms of the HGH Agreement, the Company paid EFS Midstream $81.3 million, $58.5 million and $21.3 million of gathering and treating fees during 2013, 2012 and 2011, respectively. Such amounts were expensed as oil and gas production costs in the accompanying consolidated statements of operations.

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Related Party Transactions (Schedule Of Related Party Transactions) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Related Party Transactions [Abstract]
Receipt of lease operating and supervision charges in accordance with standard industry operating agreements	$ 2,502	$ 2,437	$ 2,104
Reimbursement of general and administrative expenses	$ 276	$ 342	$ 313

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Long-Term Debt

12 Months Ended

Dec. 31, 2013

Debt Disclosure [Abstract]

Long-Term Debt

NOTE G.     Long-term Debt and Interest Expense

Long-term debt, including the effects of issuance discounts and net deferred fair value hedge losses, consisted of the following components at December 31, 2013 and 2012:

	December 31,
	2013			2012
	(in thousands)
Outstanding debt principal balances:
Pioneer credit facility	$	—		$	474,000
Pioneer Southwest credit facility	—			126,000
5.875% senior notes due 2016	455,385			455,385
6.65% senior notes due 2017	485,100			485,100
6.875 % senior notes due 2018	449,500			449,500
7.500 % senior notes due 2020	450,000			450,000
3.95% senior notes due 2022	600,000			600,000
7.20% senior notes due 2028	250,000			250,000
2.875% convertible senior notes due 2038	—			479,907
	2,689,985			3,769,892
Issuance discounts	(35,885		)	(47,309		)
Net deferred fair value hedge losses	(1,041		)	(1,390		)
Total long-term debt	$	2,653,059		$	3,721,193

Credit Facility. During December 2012, the Company entered into the First Amendment to the Second Amended and Restated 5-Year Revolving Credit Agreement (the "Credit Facility") with a syndicate of financial institutions that extended the maturity to December 20, 2017 and increased the aggregate loan commitments to $1.5 billion. As of December 31, 2013, the Company had no outstanding borrowings under the Credit Facility.

Borrowings under the Credit Facility may be in the form of revolving loans or swing line loans. Aggregate outstanding swing line loans may not exceed $150 million. Revolving loans under the Credit Facility bear interest, at the option of the Company, based on (a) a rate per annum equal to the higher of the prime rate announced from time to time by Wells Fargo Bank, National Association or the weighted average of the rates on overnight Federal funds transactions with members of the Federal Reserve System during the last preceding business day plus 0.5 percent plus a defined alternate base rate spread margin, which is currently 0.5 percent based on the Company's debt rating or (b) a base Eurodollar rate, substantially equal to LIBOR, plus a margin (the "Applicable Margin"), which is currently 1.50 percent and is also determined by the Company's debt rating. Swing line loans under the Credit Facility bear interest at a rate per annum equal to the "ASK" rate for Federal funds periodically published by the Dow Jones Market Service plus the Applicable Margin. Letters of credit outstanding under the Credit Facility are subject to a per annum fee, representing the Applicable Margin plus 0.125 percent. The Company also pays commitment fees on undrawn amounts under the Credit Facility that are determined by the Company's debt rating (currently 0.25 percent). Borrowings under the Credit Facility are general unsecured obligations.

The Credit Facility requires the maintenance of a ratio of total debt to book capitalization, subject to certain adjustments, not to exceed .60 to 1.0. As of December 31, 2013, the Company was in compliance with all of its debt covenants.

Upon completion of the Pioneer Southwest merger, the Company repaid the outstanding indebtedness and terminated the Pioneer Southwest $300 million Amended and Restated 5-Year Revolving Credit Agreement ("the "Pioneer Southwest Credit Facility"). Associated therewith, the Company charged $861 thousand of unamortized deferred financing fees related to the Pioneer Southwest Credit Facility to other expense in the accompanying consolidated statements of operations.

Senior notes. During June 2012, the Company issued $600 million of 3.95% Senior Notes due 2022 and received proceeds, net of $8.5 million of offering discounts and costs, of $591.5 million. The Company used the net proceeds from the issuance to reduce outstanding borrowings under the Credit Facility.

The Company's senior notes are general unsecured obligations ranking equally in right of payment with all other senior unsecured indebtedness of the Company and are senior in right of payment to all existing and future subordinated indebtedness of the Company. The Company is a holding company that conducts all of its operations through subsidiaries; consequently, the senior notes are structurally subordinated to all obligations of its subsidiaries. Interest on the Company's senior notes is payable semiannually.

Convertible senior notes. As of December 31, 2012, the Company had $479.9 million of Convertible Senior Notes outstanding. During December 2012 and March 2013, the Company's stock price met the price threshold that caused the Convertible Senior Notes to be convertible during the six months ended June 30, 2013 at the option of the holders into a combination of cash and the Company's common stock based on a formula set forth in the indenture supplement pursuant to which the Convertible Senior Notes were issued. In addition, on April 15, 2013, the Company announced that it would exercise its option to redeem all Convertible Senior Notes that had not been converted by the holders before May 16, 2013. Associated therewith, during the six months ended June 30, 2013, holders of $479.1 million principal amount of the Convertible Senior Notes exercised their right to convert their Convertible Senior Notes into cash and shares of the Company's common stock. The Company paid the tendering holders $479.1 million of cash and issued to the tendering holders 4.4 million shares of the Company's common stock during the six months ended June 30, 2013, in accordance with the terms of the Convertible Senior Notes indenture agreement. On May 16, 2013, the Company paid $845 thousand in principal and interest to redeem all Convertible Senior Notes that remained outstanding.

For the years ended December 31, 2013, 2012 and 2011, the Company recorded $9.4 million, $33.5 million and $32.3 million, respectively, of interest expense relating to the Convertible Senior Notes, which had an effective interest rate of 6.75 percent.

Principal maturities. Principal maturities of long-term debt at December 31, 2013, are as follows (in thousands):

2014	$	—
2015	$	—
2016	$	455,385
2017	$	485,100
2018	$	449,500
Thereafter	$	1,300,000

Interest expense. The following amounts have been incurred and charged to interest expense for the years ended December 31, 2013, 2012 and 2011:

	Year Ended December 31,
	2013			2012			2011
	(in thousands)
Cash payments for interest	$	182,126		$	168,665		$	165,251
Amortization of issuance discounts	11,423			27,351			25,210
Amortization of net deferred hedge losses (a)	349			2,018			573
Accretion of discount on postretirement benefit obligations	193			257			315
Amortization of capitalized loan fees	5,260			5,937			5,385
Net changes in accruals	(5,709		)	10,842			(1,768		)
Interest incurred	193,642			215,070			194,966
Less capitalized interest	(9,892		)	(10,848		)	(13,362		)
Total interest expense	$	183,750		$	204,222		$	181,604

_______________

(a) Includes interest rate derivative hedges of $1.7 million and $282 thousand for the periods ended December 31, 2012 and 2011, respectively, that were reclassified from AOCI - Hedging into earnings upon expiration (see Note E).

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Derivative Financial Instruments (Derivative Obligations Under Terminated Hedge Arrangements) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Derivative [Line Items]
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, before Tax	$ 0	$ (4,855)	$ 32,636
Amount of Gain (Loss) Recognized in Earnings on Derivatives	4,010	330,251	392,752
Interest Rate Derivatives [Member]
Derivative [Line Items]
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, before Tax		(1,700)	(282)
Interest Rate Derivatives [Member] | Interest Expense [Member]
Derivative [Line Items]
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, before Tax	0	(1,699)	(282)
Interest Rate Derivatives [Member] | Derivative Gains (Losses), Net [Member]
Derivative [Line Items]
Amount of Gain (Loss) Recognized in Earnings on Derivatives	9,803	(22,428)	3,098
Commodity Price Derivatives [Member] | Oil And Gas revenue [Member]
Derivative [Line Items]
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, before Tax	0	(3,156)	32,918
Commodity Price Derivatives [Member] | Derivative Gains (Losses), Net [Member]
Derivative [Line Items]
Amount of Gain (Loss) Recognized in Earnings on Derivatives	$ (5,793)	$ 352,679	$ 389,654

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Derivative Financial Instruments

12 Months Ended

Dec. 31, 2013

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Financial Instruments

NOTE E.     Derivative Financial Instruments

The Company utilizes commodity swap contracts, collar contracts and collar contracts with short puts to (i) reduce the effect of price volatility on the commodities the Company produces and sells or consumes, (ii) support the Company's annual capital budgeting and expenditure plans and (iii) reduce commodity price risk associated with certain capital projects. The Company also, from time to time, utilizes interest rate contracts to reduce the effect of interest rate volatility on the Company's indebtedness.

Oil production derivative activities. All material physical sales contracts governing the Company's oil production are tied directly to, or are highly correlated with, New York Mercantile Exchange ("NYMEX") West Texas Intermediate ("WTI") oil prices. The Company uses derivative contracts to manage oil price volatility and basis swap contracts to reduce basis risk between NYMEX prices and actual index prices at which the oil is sold.

The following table sets forth the volumes per day in BBLs associated with the Company's outstanding oil derivative contracts as of December 31, 2013 and the weighted average oil prices per BBL for those contracts:

	2014		2015		2016
Swap contracts:
Volume (BBLs)	10,000		—		—
Average price per BBL	$	93.87	$	—	$	—
Collar contracts with short puts:
Volume (BBLs)	69,000		85,000		25,000
Average price per BBL:
Ceiling	$	114.05	$	98.98	$	93.30
Floor	$	93.70	$	88.06	$	85.00
Short put	$	77.61	$	73.06	$	70.00

Subsequent to December 31, 2013, the Company entered into rollfactor swap contracts for 5,000 BBLs per day of the Company's March through December 2014 production with a NYMEX roll price of $0.82 per BBL and 5,000 BBLs per day of the Company's 2015 production with a NYMEX roll price of $0.60 per BBL. Rollfactor swap contracts fix the difference between (i) each day's price per BBL of WTI for the first nearby month less (ii) the price per BBL of WTI for the second nearby NYMEX month, multiplied by .6667; plus (iii) each day's price per BBL of WTI for the first nearby month less (iv) the price per BBL of WTI for the third nearby NYMEX month, multiplied by .3333.

NGL production derivative activities. All material physical sales contracts governing the Company's NGL production are tied directly or indirectly to either Mont Belvieu or Conway fractionation facilities' NGL component product posted prices. The Company uses derivative contracts to manage the NGL component product price volatility.

As of December 31, 2013, the Company had natural gasoline collar contracts with short put derivatives for 1,000 BBLs per day of 2014 production with a ceiling price of $109.50 per BBL, a floor price of $95.00 per BBL and short put price of $80.00 per BBL; and ethane collar contracts for 3,000 BBLs per day of 2014 production with a ceiling price of $13.72 per BBL and a floor price of $10.78 per BBL.

Subsequent to December 31, 2013, the Company entered into propane swap contracts for 1,000 BBLs per day of March through December 2014 production with a price of $47.57 per BBL and 2,000 BBLs per day of April through October 2014 production with a price of $48.51 per BBL.

Gas production derivative activities. All material physical sales contracts governing the Company's gas production are tied directly or indirectly to NYMEX Henry Hub ("HH") gas prices or regional index prices where the gas is sold. The Company uses derivative contracts to manage gas price volatility and basis swap contracts to reduce basis risk between HH prices and actual index prices at which the gas is sold.

The following table sets forth the volumes per day in MMBTUs associated with the Company's outstanding gas derivative contracts as of December 31, 2013 and the weighted average gas prices per MMBTU for those contracts:

	2014			2015			2016
Swap contracts:
Volume (MMBTUs)	195,000			20,000			—
Price per MMBTU	$	4.04		$	4.31		$	—
Collar contracts with short puts:
Volume (MMBTUs)	115,000			285,000			20,000
Price per MMBTU:
Ceiling	$	4.70		$	5.07		$	5.36
Floor	$	4.00		$	4.00		$	4.00
Short put	$	3.00		$	3.00		$	3.00
Basis swap contracts:
Volume (MMBTUs) (a)	85,082			30,000			—
Price per MMBTU	$	(0.20	)	$	(0.18	)	$	—

_________________

(a) Subsequent to December 31, 2013, the Company entered into additional basis swap contracts for 35,000 MMBTU per day of April through December 2014 production with a negative price differential of $0.27 per MMBTU between the relevant index price and the NYMEX price.

Marketing and basis transfer derivatives. Periodically, the Company enters into buy and sell marketing arrangements to fulfill firm pipeline transportation commitments. Associated with these marketing arrangements, the Company may enter into index swaps to mitigate price risk. As of December 31, 2013, the Company had no open marketing derivative positions. Subsequent to December 31, 2013, the Company entered into marketing gas index swap contracts for 20,000 MMBTU per day of March 2014 volumes with a price differential of $0.34 per MMBTU, 10,000 MMBTU per day of April through October 2014 volumes with a price differential of $0.36 per MMBTU and 30,000 MMBTU per day of April through December 2014 volumes with a price differential of $0.30 per MMBTU.

Interest rates. During the second quarter of 2013, the Company terminated its interest rate derivative contracts that locked in a fixed forward annual interest rate of 3.21 percent, for a 10-year period ending in December 2025, on a notional amount of $250 million and received cash proceeds of $482 thousand.

As of December 31, 2013, the Company was a party to interest rate derivative contracts whereby the Company will receive a fixed interest rate of 3.95 percent in exchange for paying a floating interest rate comprised of the three-month LIBOR plus an average rate of 1.11 percent on a notional amount of $400 million through July 15, 2022.

Tabular disclosure of derivative financial instruments. All of the Company's derivatives are accounted for as non-hedge derivatives as of December 31, 2013 and December 31, 2012 and therefore all changes in the fair values of its derivative contracts are recognized as gains or losses in the earnings of the periods in which they occur. The Company classifies the fair value amounts of derivative assets and liabilities as net current or noncurrent derivative assets or net current or noncurrent derivative liabilities, whichever the case may be, by commodity and counterparty. The Company enters into derivatives under master netting arrangements, which, in an event of default, allows the Company to offset payables to and receivables from the defaulting counterparty.

The aggregate fair value of the Company's derivative instruments reported in the consolidated balance sheets by type and counterparty, including the classification between current and noncurrent assets and liabilities, consists of the following:

Fair Value of Derivative Instruments as of December 31, 2013
Type	Consolidated Balance Sheet Location	Fair Value		Gross Amounts Offset in the Consolidated Balance Sheet			Net Fair Value Presented in the Consolidated Balance Sheet
		(in thousands)
Derivatives not designated as hedging instruments
Asset Derivatives:
Commodity price derivatives	Derivatives - current	$	73,431	$	(7,724	)	$	65,707
Interest rate derivatives	Derivatives - current	$	9,530	$	—		$	9,530
Commodity price derivatives	Derivatives - noncurrent	$	95,358	$	(4,504	)	90,854
Interest rate derivatives	Derivatives - noncurrent	$	15,493	$	(15,493	)	$	—
							$	166,091
Liability Derivatives:
Commodity price derivatives	Derivatives - current	$	19,350	$	(7,724	)	$	11,626
Commodity price derivatives	Derivatives - noncurrent	$	4,504	$	(4,504	)	—
Interest rate derivatives	Derivatives - noncurrent	$	25,426	$	(15,493	)	$	9,933
							$	21,559

Fair Value of Derivative Instruments as of December 31, 2012
Type	Consolidated Balance Sheet Location	Fair Value		Gross Amounts Offset in the Consolidated Balance Sheet			Net Fair Value Presented in the Consolidated Balance Sheet
		(in thousands)
Derivatives not designated as hedging instruments
Asset Derivatives:
Commodity price derivatives	Derivatives - current	$	286,805	$	(7,686	)	$	279,119
Commodity price derivatives	Derivatives - noncurrent	$	61,618	$	(6,361	)	55,257
							$	334,376
Liability Derivatives:
Commodity price derivatives	Derivatives - current	$	21,102	$	(7,686	)	$	13,416
Commodity price derivatives	Derivatives - noncurrent	$	8,944	$	(6,361	)	2,583
Interest rate derivatives	Derivatives - noncurrent	$	9,724	$	—		9,724
							$	25,723

The following table details the location of gains and losses reclassified from AOCI-Hedging into earnings on the Company's discontinued cash flow hedging contracts in the accompanying consolidated statements of operations:

Derivatives in Cash Flow Hedging Relationships	Location of Gain/(Loss) Reclassified from AOCI into Earnings	Amount of Gain/(Loss) Reclassified from AOCI into Earnings
		Year Ended December 31,
		2013		2012			2011
		(in thousands)
Interest rate derivatives	Interest expense	$	—	$	(1,699	)	$	(282	)
Commodity price derivatives	Oil and gas revenue	—		(3,156		)	32,918
Total		$	—	$	(4,855	)	$	32,636

The following table details the location of gains and losses recognized on the Company's derivative contracts in the accompanying consolidated statements of operations:

Derivatives Not Designated as Hedging Instruments	Location of Gain (Loss) Recognized in Earnings on Derivatives	Amount of Gain (Loss) Recognized in Earnings on Derivatives
		Year Ended December 31,
		2013			2012			2011
		(in thousands)
Interest rate derivatives	Derivative gains, net	$	9,803		$	(22,428	)	$	3,098
Commodity price derivatives	Derivative gains, net	(5,793		)	352,679			389,654
Total		$	4,010		$	330,251		$	392,752

Derivative counterparties. The Company uses credit and other financial criteria to evaluate the credit standing of, and to select, counterparties to its derivative instruments. Although the Company does not obtain collateral or otherwise secure the fair value of its derivative instruments, associated credit risk is mitigated by the Company's credit risk policies and procedures.

The following table provides the Company's net derivative assets or liabilities by counterparty as of December 31, 2013:

	Net Assets (Liabilities)
	(in thousands)
JP Morgan Chase	$	46,908
Morgan Stanley	17,411
Merrill Lynch	16,979
Barclays Capital	16,923
Den Norske Bank	8,928
Societe Generale	8,754
Macquarie Bank	8,146
J. Aron & Company	6,817
Wells Fargo Bank, N.A.	4,969
Citibank, N.A.	4,857
Deutsche Bank	1,374
BMO Financial Group	1,041
Credit Suisse	992
BP Corporation North America	793
Royal Bank of Canada	752
BNP Paribas	473
Toronto Dominion	(476		)
Mitsubishi UFJ Financial Group	(504		)
Credit Agricole	(605		)
Total	$	144,532

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Exploratory Well Costs

12 Months Ended

Dec. 31, 2013

Capitalized Exploratory Well Costs [Abstract]

Exploratory Well Costs

NOTE F.    Exploratory Well Costs

The Company capitalizes exploratory well and project costs until a determination is made that the well or project has either found proved reserves, is impaired or is sold. The Company's capitalized exploratory well and project costs are presented in proved properties in the accompanying consolidated balance sheets. If the exploratory well or project is determined to be impaired, the impaired costs are charged to exploration and abandonments expense.

The following table reflects the Company's capitalized exploratory well and project activity during each of the years ended December 31, 2013, 2012 and 2011:

	Year Ended December 31,
	2013			2012			2011
	(in thousands)
Beginning capitalized exploratory well costs	$	212,670		$	107,596		$	96,193
Additions to exploratory well costs pending the determination of proved reserves	1,219,797			926,084			524,313
Reclassification due to determination of proved reserves	(1,044,815		)	(790,373		)	(480,716		)
Disposition of assets sold	(92,855		)	—			(28,938		)
Impairment of properties	(86,761		)	—			—
Exploratory well costs charged to exploration and abandonment expense (a)	(49,134		)	(30,637		)	(3,256		)
Ending capitalized exploratory well costs (b)	$	158,902		$	212,670		$	107,596

 _______________

(a) Includes exploration and abandonment expense reclassified as discontinued operations of $43.3 million, $21.6 million, and $180 thousand in 2013, 2012 and 2011, respectively.

(b) Includes $60.3 million of capitalized exploratory well costs classified as held for sale in the accompanying consolidated balance sheet as of December 31, 2013.

The following table provides an aging, as of December 31, 2013, 2012 and 2011 of capitalized exploratory costs and the number of projects for which exploratory well costs have been capitalized for a period greater than one year, based on the date drilling was completed:

	Year Ended December 31,
	2013		2012		2011
	(in thousands, except well counts)
Capitalized exploratory well costs that have been suspended:
One year or less	$	115,955	$	190,678	$	107,596
More than one year	42,947		21,992		—
	$	158,902	$	212,670	$	107,596
Number of projects with exploratory well costs that have been suspended for a period greater than one year	1		1		—

Alaska - Nuna. The Company's Nuna project, which has $42.9 million of suspended project costs as of December 31, 2013, includes the Nuna-1 exploration well that was drilled during 2012 to test the Torok formation and a second appraisal well that was drilled and logged during the first quarter of 2013. The Company flow-tested the Nuna-1 well during the second quarter of 2012 and again in the first quarter of 2013. The second appraisal well encountered a mechanical problem and could not be flow-tested before the end of the winter drilling season. The results of the flow tests on the Nuna-1 well and the log data from the second Nuna well are both very encouraging. The Company is currently conducting a front-end engineering design study to evaluate the potential for onshore production facilities to support the project. The capitalized exploratory well costs associated with the Nuna project are classified as held for sale in the accompanying consolidated balance sheet as of December 31, 2013.

Alaska - Oooguruk.As of December 31, 2012, the Company had $22.0 million of suspended well costs recorded for the K-13 well in the Alaska Oooguruk field. Drilling on the K-13 well was completed during September 2011. During well completion operations, subsurface damages were sustained. The Company performed repairs to correct a subsurface safety valve and a tubing leak in the third quarter of 2013. These repairs enabled a production test in the fourth quarter of 2013, which had negative results.  Based on the negative production test results, the Company has discontinued any future plans to complete and produce the well. Accordingly, an exploration and abandonment charge of $33.7 million was recorded in the fourth quarter of 2013 to write off the K-13 well's carrying value, which is included in loss from discontinued operations, net of tax in the accompanying consolidated statements of operations.

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Incentive Plans

12 Months Ended

Dec. 31, 2013

Compensation and Retirement Disclosure [Abstract]

Compensation and Employee Benefit Plans [Text Block]

NOTE H.     Incentive Plans

Retirement Plans

Deferred compensation retirement plan. In August 1997, the Compensation Committee of the Company's board of directors (the "Board") approved a deferred compensation retirement plan for the officers and certain key employees of the Company. Each officer and key employee is allowed to contribute up to 25 percent of their base salary and 100 percent of their annual bonus. The Company will provide a matching contribution of 100 percent of the officer's and key employee's contribution limited to the first ten percent of the officer's base salary and eight percent of the key employee's base salary. The Company's matching contribution vests immediately. A trust fund has been established by the Company to accumulate the contributions made under this retirement plan. The Company's matching contributions were $2.7 million, $2.4 million and $2.2 million for the years ended December 31, 2013, 2012 and 2011, respectively.

401(k) plan. The Pioneer Natural Resources USA, Inc. ("Pioneer USA," a wholly-owned subsidiary of the Company) 401(k) and Matching Plan (the "401(k) Plan") is a defined contribution plan established under the Internal Revenue Code Section 401. All regular full-time and part-time employees of Pioneer USA are eligible to participate in the 401(k) Plan on the first day of the month following their date of hire. Participants may contribute an amount up to 80 percent of their annual salary into the 401(k) Plan. Matching contributions are made to the 401(k) Plan in cash by Pioneer USA in amounts equal to 200 percent of a participant's contributions to the 401(k) Plan that are not in excess of five percent of the participant's base compensation (the "Matching Contribution"). Each participant's account is credited with the participant's contributions, Matching Contributions and allocations of the 401(k) Plan's earnings. Participants are fully vested in their account balances except for Matching Contributions and their proportionate share of 401(k) Plan earnings attributable to Matching Contributions, which proportionately vest over a four-year period that begins with the participant's date of hire. During the years ended December 31, 2013, 2012 and 2011, the Company recognized compensation expense of $29.7 million, $24.7 million and $18.3 million, respectively, as a result of Matching Contributions.

Stock-based compensation costs. In accordance with GAAP, the Company records stock-based compensation expense, equal to the fair value of share-based payments, ratably over the vesting periods of the Long-Term Incentive Plan ("LTIP") awards, the Pioneer Southwest Long-Term Incentive Plan ("Pioneer Southwest LTIP") awards, the Series B unit awards issued by Sendero and for payments associated with the Company's Employee Stock Purchase Plan ("ESPP").

The following table reflects stock-based compensation expense recorded for each type of incentive award and the associated income tax benefit for the years ended December 31, 2013, 2012 and 2011:

	Year Ended December 31,
	2013		2012		2011
	(in thousands)
Restricted stock-equity awards	$	56,165	$	48,876	$	32,861
Restricted stock-Liability Awards	40,404		22,419		10,882
Stock options (a)	2,952		4,110		2,936
Performance unit awards	9,131		6,162		4,500
Pioneer Southwest LTIP	1,029		1,098		761
Sendero Series B units	1,020		982		1,020
ESPP	1,731		2,437		125
Total	$	112,432	$	86,084	$	53,085
Income tax benefit	$	36,298	$	27,901	$	22,084

 _____________________

(a) Cash proceeds received from stock option exercises during 2013, 2012 and 2011 amounted to $5.0 million, $3.1 million and $619 thousand, respectively.

As of December 31, 2013, there was $146.3 million of unrecognized stock-based compensation expense related to unvested share-based compensation plans, including $44.8 million attributable to Liability Awards. The stock-based compensation expense will be recognized on a straight-line basis over the remaining vesting periods of the awards, which is a period of less than three years on a weighted average basis.

Pioneer Long-Term Incentive Plan

In May 2006, the Company's stockholders approved the LTIP, which provides for the granting of various forms of awards, including stock options, stock appreciation rights, performance units, restricted stock and restricted stock units to directors, officers and employees of the Company. The LTIP provides for the issuance of 9.1 million shares pursuant to awards under the plan. The shares to be delivered under the LTIP shall be made available from (i) authorized but unissued shares, (ii) shares held as treasury stock or (iii) previously issued shares reacquired by the Company, including shares purchased on the open market.

The following table shows the number of shares available for issuance pursuant to awards under the Company's LTIP at December 31, 2013:

Approved and authorized awards	9,100,000
Awards issued after May 3, 2006	(6,506,571	)
Awards available for future grant	2,593,429

Restricted stock awards. During 2013, the Company awarded 683,952 restricted shares or units of the Company's common stock as compensation to directors, officers and employees of the Company (including 250,641 shares or units representing Liability Awards). The Company's issued shares, as reflected in the consolidated balance sheets as of December 31, 2013, do not include 197,340 of issued, but unvested shares awarded under stock-based compensation plans that have voting rights.

The following table reflects the restricted stock award activity for the year ended December 31, 2013:

	Equity Awards				Liability Awards
	Number of Shares		Weighted Average Grant- Date Fair Value		Number of Shares
Outstanding at beginning of year	1,512,762		$	96.22	405,916
Shares granted	433,311		$	134.58	250,641
Shares forfeited	(80,150	)	$	116.50	(35,813	)
Shares vested	(517,908	)	$	70.22	(198,362	)
Outstanding at end of year	1,348,015		$	117.09	422,382

The weighted average grant-date fair value of restricted stock equity awards awarded during 2013, 2012 and 2011 was $134.58, $113.02 and $97.52, respectively. The fair value of shares for which restrictions lapsed during 2013, 2012 and 2011 was $67.7 million, $137.2 million and $98.6 million, respectively, based on the market price on the vesting date.

As of December 31, 2013 and 2012, accounts payable – due to affiliates in the accompanying consolidated balance sheet includes $33.0 million and $18.8 million of liabilities attributable to the Liability Awards, representing the earned portion of the fair value of the outstanding awards as of that date. The fair value of shares for which restrictions lapsed during 2013, 2012 and 2011 was $26.1 million, $14.2 million and $6.7 million respectively, based on the market price on the vesting date.

Stock option awards. Certain employees may be granted options to purchase shares of the Company's common stock with an exercise price equal to the fair market value of Pioneer common stock on the date of grant. The fair value of stock option awards is determined using the Black-Scholes option-pricing model. Option awards have a ten-year contract life. The expected life of an option is estimated based on historical and expected exercise behavior. The volatility assumption was estimated based upon expectations of volatility over the life of the option as measured by historical volatility. The risk-free interest rate was based on the United States Treasury rate for a term commensurate with the expected life of the option. The dividend yield was based upon a seven-year average dividend yield.

The Company did not grant any stock options during the year ended December 31, 2013. The Company used the following weighted-average assumptions to estimate the fair value of stock options granted during the years ended December 31, 2012 and 2011:

	2012		2011
Expected option life - years	7.0		7.0
Volatility	49.4	%	47.6	%
Risk-free interest rate	1.5	%	2.9	%
Dividend yield	0.4	%	0.4	%

A summary of the Company's nonstatutory stock option awards activity for the year ended December 31, 2013 is presented below:

	Number of Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Life	Aggregate Intrinsic Value
					(in years)	(in thousands)
Outstanding at beginning of year	467,486		$	59.63
Options expired and forfeited	(11,085	)	$	106.90
Options exercised	(166,474	)	$	29.88
Outstanding and expected to vest, at end of year	289,927		$	74.90	6.80	$	31,651
Exercisable at end of year	115,290		$	26.74	5.48	$	18,139

The weighted average grant-date fair value of options awarded during 2012 and 2011 was $56.29 and $49.61, respectively, using the Black-Scholes option-pricing model. The intrinsic value of options exercised during 2013, 2012 and 2011 was $20.5 million, $17.2 million and $1.5 million, respectively, based on the difference between the market price at the exercise date and the option exercise price.

Performance unit awards. During 2013, 2012 and 2011, the Company awarded performance units to certain of the Company's officers under the LTIP. The number of shares of common stock to be issued is determined by comparing the Company's total shareholder return to the total shareholder return of a predetermined group of peer companies over the performance period. The performance unit awards vest over a 34-month service period. The grant-date fair values per unit of the 2013, 2012 and 2011 performance unit awards are $189.23, $172.57 and $134.68, respectively, which amounts were determined using the Monte Carlo simulation method and are being recognized as stock-based compensation expense ratably over the performance period. The Monte Carlo simulation model utilizes multiple input variables that determine the probability of satisfying the market condition stipulated in the award grant and calculates the fair value of the award. Expected volatilities utilized in the model were estimated using a historical period consistent with the remaining performance period of approximately three years. The risk-free interest rate was based on the United States Treasury rate for a term commensurate with the expected life of the grant. The Company used the following assumptions to estimate the fair value of performance unit awards granted during 2013, 2012 and 2011:

	2013				2012				2011
Risk-free interest rate	0.40%				0.40%				1.32%
Range of volatilities	30.4	%	-	42.9%	33.6	%	-	49.0%	50.2	%	-	84.1%

The following table summarizes the performance unit activity for the year ended December 31, 2013:

	Number of Units (a)		Weighted  Average Grant-Date Fair Value
Beginning performance unit awards	91,370		$	154.53
Units granted	94,917		$	189.23
Units forfeited	(10,842	)	$	172.02
Units vested (b)	(40,969	)	$	134.68
Ending performance unit awards	134,476		$	183.66

 _____________________

(a) These amounts reflect the number of performance units granted. The actual payout of shares may be between zero percent and 250 percent of the performance units granted depending upon the total shareholder return ranking of the Company compared to peer companies at the vesting date.

(b) On December 31, 2013, the service period lapsed on 40,969 of these performance unit awards. The lapsed units earned 2.5 shares for each vested award representing 102,424 aggregate shares of common stock issued on January 2, 2014.

The fair value of shares for which restrictions lapsed during 2013, 2012 and 2011 was $18.9 million, $18.8 million and $44.7 million, respectively, based on the market price on the vesting date.

Pioneer 2008 PSE Employee Long-Term Incentive Plan

In May 2008, the board of directors of the general partner (the "General Partner") of Pioneer Southwest adopted the Pioneer Southwest 2008 Long-Term Incentive Plan ("Pioneer Southwest LTIP"), which provides for the granting of various forms of unit-based awards. In connection with the Pioneer Southwest merger the Company has, effective as of December 17, 2013, assumed, adopted and amended the Pioneer Southwest LTIP, and has changed the name of such plan to the Pioneer 2008 PSE Employee Long-Term Incentive Plan ("PSE LTIP"), and has assumed all Pioneer Southwest obligations associated with the Pioneer Southwest LTIP existing prior to its assumption and adoption by the Company. The Pioneer Southwest LTIP limits the number of awards granted under the plan to 3.0 million common units of Pioneer Southwest. As of the date of the Pioneer Southwest merger, 2.9 million common units under the Pioneer Southwest LTIP were available to be awarded or remained outstanding (678,034 common shares of Pioneer based upon the Conversion Ratio) and are carried forward to the PSE LTIP. The only outstanding awards under the PSE LTIP at the time of the Pioneer Southwest merger and immediately prior to the assumption and adoption of the PSE LTIP by the Company were phantom units of Pioneer Southwest. All such outstanding phantom units were converted at the effective time of the Pioneer Southwest merger based on the Conversion Ratio into restricted stock units of the Company, subject to the vesting schedule determined by the grant under the Pioneer Southwest LTIP which is a three-year vesting period from the date of grant. The common shares of Pioneer to be delivered under the PSE LTIP shall be made available from (i) authorized but unissued shares, (ii) shares held as treasury stock or (iii) previously issued shares reacquired by the Company, including shares purchased on the open market.

The following table shows the number of Pioneer common shares available for issuance pursuant to awards under the PSE LTIP at December 31, 2013:

Awards approved and outstanding	678,034
Awards issued under the PSE LTIP (a)	(23,192	)
Awards available for future grant (b)	654,842

_____________________

(a) Shares that represent outstanding awards originally granted under the Pioneer Southwest LTIP that have been assumed and adopted by the Company in connection with, and that continue to be outstanding after, the Pioneer Southwest merger.

(b) Shares that have not been issued and are not subject to outstanding awards granted under the Pioneer Southwest LTIP.

The board of directors of the General Partner awarded 7,496 restricted common Pioneer Southwest units (1,743 shares of Pioneer common stock based on the Conversion Ratio) in 2012, which vested in May 2013, and 6,812 units (1,584 shares of Pioneer common stock based on the Conversion Ratio) in 2011, which vested in May 2012, as compensation to non-employee directors of the General Partner under the Pioneer Southwest LTIP. There were no restricted common units awarded under the Pioneer Southwest LTIP during 2013 and no awards outstanding at December 31, 2013.

The following table summarizes the activity of phantom unit awards issued under the Pioneer Southwest LTIP during 2013, which were converted to restricted stock units of the Company under the PSE LTIP based upon the Conversion Ratio:

	Phantom Unit Awards
	Number of Awards (a)		Weighted Average Grant-Date Fair Value
Outstanding awards at beginning of year	23,865		$	117.94
Units granted	7,492		$	110.32
Lapse of restrictions	(8,165	)	$	97.81
Outstanding awards at end of year	23,192		$	122.55

_____________________

(a) Reflects the number of awards in Pioneer common stock after the Pioneer Southwest merger based upon the Conversion Ratio.

The weighted average grant-date fair value of Pioneer Southwest restricted common units awarded during 2012 and 2011 was $114.75 and $126.24, respectively, based upon the Conversion Ratio. The fair value of common units for which restrictions lapsed on the restricted common units during 2013, 2012 and 2011 was $200 thousand, $200 thousand and $342 thousand, respectively, based on the market price at the vesting date.

The weighted average grant-date fair value of Pioneer Southwest phantom units awarded during 2013, 2012 and 2011 was $110.32, $120.43 and $138.32, respectively, based upon the Conversion Ratio. The fair value of phantom units for which restrictions lapsed during 2013was $799 thousand.

Subsidiary Issuances of Unit-Based Compensation

During 2010, Sendero entered into restricted unit agreements with two key employees, granting 1,000 Series B units in Sendero. The Series B unit awards had a grant date fair value of $5.1 million, vest ratably over a five year service period and do not earn equity rights unless certain defined performance conditions are achieved by Sendero.

Employee Stock Purchase Plan

The Company has an ESPP that allows eligible employees to annually purchase the Company's common stock at a discounted price. Officers of the Company are not eligible to participate in the ESPP. Contributions to the ESPP are limited to 15 percent of an employee's pay (subject to certain ESPP limits) during the eight-month offering period (January 1 to August 31). Participants in the ESPP purchase the Company's common stock at a price that is 15 percent below the closing sales price of the Company's common stock on either the first day or the last day of each offering period, whichever closing sales price is lower.

The following table shows the number of shares available for issuance under the ESPP at December 31, 2013:

Approved and authorized shares	1,250,000
Shares issued	(734,972	)
Shares available for future issuance	515,028

Postretirement Benefit Obligations

At December 31, 2013 and 2012, the Company had $7.6 million and $9.7 million, respectively, of unfunded accumulated postretirement benefit obligations. These obligations are comprised of five unfunded plans, of which four relate to predecessor entities that the Company acquired in prior years, and two funded plans that the Company assumed sponsorship of in conjunction with the acquisition of Premier Silica. Other than the Company's retirement plan and the two legacy-Premier Silica plans, the participants of these plans are not current employees of the Company. The unfunded plans had no assets as of December 31, 2013 or 2012.

Incentive Plans

Stock-based compensation. For stock-based compensation awards granted or modified, stock-based compensation expense is being recognized in the Company's financial statements on a straight line basis over the awards' vesting periods based on their fair values on the dates of grant or modification, as applicable. The stock-based compensation awards generally vest over a period not exceeding three years. The amount of stock-based compensation expense recognized at any date is approximately equal to the ratable portion of the grant date value of the award that is vested at that date. The Company utilizes (i) the Black-Scholes option pricing model to measure the fair value of stock options, (ii) the prior day's closing stock price on the date of grant for the fair value of restricted stock, restricted stock units, partnership unit awards or phantom unit awards that are expected to be settled in the Company's common stock ("Equity Awards"), (iii) the Monte Carlo simulation method for the fair value of performance unit awards and (iv) a probabilistic forecasted fair value method for Series B unit awards issued by Sendero.

Stock-based compensation liability awards are awards that are expected to be settled in cash on their vesting dates, rather than in equity shares or units ("Liability Awards"). Stock-based Liability Awards are recorded as accounts payable—affiliates based on the vested portion of the fair value of the awards on the balance sheet date. The fair values of Liability Awards are updated at each balance sheet date and changes in the fair values of the vested portions of the awards are recorded as increases or decreases to stock-based compensation expense.

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Long-Term Debt (Narrative) (Details) (USD $) Share data in Millions, unless otherwise specified	12 Months Ended							12 Months Ended	6 Months Ended			6 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Pioneer Credit Facility [Member] Rate	Dec. 31, 2012 Pioneer Credit Facility [Member]	Dec. 31, 2013 Pioneer Southwest Credit Facility [Member]	Dec. 31, 2012 Pioneer Southwest Credit Facility [Member]	Dec. 31, 2013 Swing Line Loans [Member] Pioneer Credit Facility [Member]	Jun. 30, 2012 3.95% Senior Notes Due 2022 [Member] Rate	Dec. 31, 2013 3.95% Senior Notes Due 2022 [Member] Rate	Dec. 31, 2012 3.95% Senior Notes Due 2022 [Member]	Jun. 30, 2013 2.875% Convertible Senior Notes Due 2038 [Member]	Dec. 31, 2013 2.875% Convertible Senior Notes Due 2038 [Member] Rate	Dec. 31, 2012 2.875% Convertible Senior Notes Due 2038 [Member]	Dec. 31, 2011 2.875% Convertible Senior Notes Due 2038 [Member]	Dec. 31, 2013 Total Debt To Book Capitalization [Member] Pioneer Credit Facility [Member]
Line of credit facility, maximum borrowing capacity				$ 1,500,000,000		$ 300,000,000
Maximum outstanding borrowings under the Credit Facility								150,000,000
Federal fund rate				0.50%
Alternate base rate spread				0.50%
Applicable margin				1.50%
Letters of credit outstanding under the Credit Facility, interest percentage				0.125%
Unused portion, fee percentage				0.25%
Debt instrument covenant description																.60
Unamortized Debt Issuance Expense	861,000
Issuance of senior notes									600,000,000	600,000,000	600,000,000
Senior Notes, interest rate, percentage									3.95%	3.95%			2.875%
Senior notes offering discounts and cost									8,500,000
Borrowings under long-term debt	466,864,000	1,776,618,000	196,616,000						591,500,000
Convertible debt													0	479,907,000
Principal amount of notes tendered for conversion												479,100,000
Cash Paid To Conversion Of Convertible Senior Notes												479,100,000
Shares received for conversion of debt												4.4
Cash Paid To Redeem Convertible Debt												845,000
Interest expense relating to the contractual interest coupon and unamortized discount													9,400,000	33,500,000	32,300,000
Debt instrument, effective interest rate, percentage													6.75%
Outstanding borrowings under the Credit Facility				$ 0	$ 474,000,000	$ 0	$ 126,000,000

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Major Customers (Consolidated Oil, NGL And Gas Revenues) (Details)	12 Months Ended
	Dec. 31, 2013 Rate	Dec. 31, 2012 Rate	Dec. 31, 2011 Rate
Plains Marketing LP [Member]
Consolidated oil, NGL and gas revenues represented by the company's purchases	26.00%	25.00%	16.00%
Enterprise Products Partners L.P. [Member]
Consolidated oil, NGL and gas revenues represented by the company's purchases	12.00%	14.00%	12.00%
Occidental Energy Marketing Inc [Member]
Consolidated oil, NGL and gas revenues represented by the company's purchases	12.00%	13.00%	14.00%

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Long-Term Debt (Principal Maturities Of Long-Term Debt) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013
Debt Disclosure [Abstract]
2013	$ 0
2014	0
2015	455,385
2016	485,100
2017	449,500
Thereafter	$ 1,300,000

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Exploratory Well Costs (Capitalized Exploratory Costs And the Number Of Projects For Which Exploratory Costs Have Been Capitalized) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
One year or less	$ 115,955		$ 190,678		$ 107,596
More than one year	42,947		21,992		0
Capitalized exploratory well costs, total suspended	158,902	[1]	212,670	[1]	107,596	[1]	96,193
Number of projects with exploratory well costs that have been suspended for a period greater than one year	1		1		0
Capitalized Exploratory Well Cost, Charged to Expense	49,134	[2]	30,637	[2]	3,256	[2]
Nuna [Member]
More than one year	42,947
Oooguruk [Member]
More than one year			21,992
Capitalized Exploratory Well Cost, Charged to Expense	$ (33,700)

[1] Includes $60.3 million of capitalized exploratory well costs classified as held for sale in the accompanying consolidated balance sheet as of December 31, 2013.

[2] Includes exploration and abandonment expense reclassified as discontinued operations of $43.3 million, $21.6 million, and $180 thousand in 2013, 2012 and 2011, respectively.

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Income Taxes (Schedule Of Effective Income Tax Rate Reconciliation) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 Rate	Dec. 31, 2012 Rate	Dec. 31, 2011 Rate
Income Tax Disclosure [Abstract]
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	$ (561,719)	$ 837,520	$ 596,068
Net Income Attributable to Noncontrolling Interest	(38,865)	(50,537)	(47,425)
Income loss from continuing operations before tax	(600,584)	786,983	548,643
U.S. federal statutory tax rate	35.00%	35.00%	35.00%
Income Tax Reconciliation, Income Tax Expense (Benefit), at Federal Statutory Income Tax Rate	210,204	(275,444)	(192,025)
Income Tax Reconciliation, State and Local Income Taxes	13,883	(8,206)	(5,576)
Income Tax Reconciliation, Other Adjustments	(12,312)	(6,838)	9,323
Income Tax Expense (Benefit)	$ 211,775	$ (290,488)	$ (188,278)
Effective Income Tax Rate, Continuing Operations	35.00%	37.00%	34.00%

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Asset Retirement Obligations (Tables)

12 Months Ended

Dec. 31, 2013

Asset Retirement Obligation [Abstract]

Schedule Of Asset Retirement Obligations

The following table summarizes the Company's asset retirement obligation activity during the years ended December 31, 2013, 2012 and 2011:

	Year Ended December 31,
	2013			2012			2011
	(in thousands)
Beginning asset retirement obligations	$	197,754		$	136,742		$	152,291
Obligations assumed in acquisitions	—			10,498			6
New wells placed on production	5,775			9,593			9,233
Changes in estimates (a)	7,939			51,536			7,490
Obligations reclassified to liabilities held for sale	(10,091		)	—			(29,892		)
Disposition of wells	(6,083		)	(2,536		)	(448		)
Obligations settled	(13,953		)	(18,066		)	(12,880		)
Accretion of discount on continuing operations	11,862			8,677			7,506
Accretion of discount from integrated services (b)	14			100			—
Accretion of discount on discontinued operations	831			1,210			3,436
Ending asset retirement obligations	$	194,048		$	197,754		$	136,742

 _____________________

(a) The changes in the 2013, 2012 and 2011 estimates are primarily due to increases in abandonment cost estimates based on recent actual costs incurred to abandon wells and declines in credit-adjusted risk-free discount rates used to value increases in asset retirement obligations. The increases in 2013 and 2011 estimates were partially offset by higher commodity prices, which had the effect of lengthening the economic life of certain wells and decreasing the present value of future retirement obligations. The increase in the 2012 estimate was further impacted by declines in oil, NGL and gas prices used to calculate proved reserves, which had the effect of shortening the economic life of certain wells and increasing the present value of future retirement obligations.

(b) Accretion of discount from integrated services includes Premier Silica accretion expense, which is recorded as a reduction in income from vertical integration services in interest and other income in the Company's accompanying consolidated statements of operations. See Note M for more information about interest and other income.

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Disclosures About Fair Value Measurements (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended	3 Months Ended
	Dec. 31, 2013	Dec. 31, 2013 Rate	Dec. 31, 2012 Barnett Shale Field [Member]
discount rate used in impairment calculation		10.00%
Impairment of Long-Lived Assets Held-for-use			$ 71.8
Inventory Write-down	$ 23.2

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Interest And Other Income

12 Months Ended

Dec. 31, 2013

Interest and Other Income [Abstract]

Interest And Other Income

NOTE M.    Interest and Other Income    

The following table provides the components of the Company's interest and other income during the years ended December 31, 2013, 2012 and 2011:

	Year Ended December 31,
	2013			2012			2011
	(in thousands)
Other income	$	8,282		$	5,382		$	9,125
Equity interest in income of EFS Midstream	7,266			2,183			1,925
Deferred compensation plan income	5,954			1,872			1,657
Interest income	321			1,465			697
Income (loss) from vertical integration services (a)	(4,862		)	(11,934		)	15,978
Total interest and other income	$	16,961		$	(1,032	)	$	29,382

 ______________________

(a) Income (loss) from vertical integration services represent net margins that result from Company-provided fracture stimulation, drilling and related service operations, which are ancillary to and supportive of the Company's oil and gas joint operating activities, and do not represent intercompany transactions. For the three years ended December 31, 2013, 2012 and 2011, these net margins include $284.9 million, $247.8 million and $50.9 million of gross vertical integration revenues, respectively and $289.8 million, $259.7 million and $34.9 million of total vertical integration costs and expenses, respectively.

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Net IncomePer Share Attributable To Common Stockholders Net Income Per Share Attributable to Common Stockholders (Policies)

12 Months Ended

Dec. 31, 2013

Net Income Per Share Attributable to Common Stockholders [Abstract]

Earnings Per Share, Policy [Policy Text Block]

In the calculation of basic net income (loss) per share attributable to common stockholders, participating securities are allocated earnings based on actual dividend distributions received plus a proportionate share of undistributed net income attributable to common stockholders, if any, after recognizing distributed earnings. The Company's participating securities do not participate in undistributed net losses because they are not contractually obligated to do so. The computation of diluted net income (loss) per share attributable to common stockholders reflects the potential dilution that could occur if securities or other contracts to issue common stock that are dilutive were exercised or converted into common stock or resulted in the issuance of common stock that would then share in the earnings of the Company. During periods in which the Company realizes a loss from continuing operations attributable to common stockholders, securities or other contracts to issue common stock would not be dilutive to net loss per share and conversion into common stock is assumed not to occur. Diluted net income (loss) per share is calculated under both the two-class method and the treasury stock method and the more dilutive of the two calculations is presented.

The Company's basic net income (loss) per share attributable to common stockholders is computed as (i) net income (loss) attributable to common stockholders, (ii) less participating share- and unit-based basic earnings (iii) divided by weighted average basic shares outstanding. The Company's diluted net income (loss) per share attributable to common stockholders is computed as (i) basic net income (loss) attributable to common stockholders, (ii) plus diluted adjustments to participating undistributed earnings (iii) divided by weighted average diluted shares outstanding (excluding shares held in treasury).

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Net Income (Loss) Per Share Attributable To Common Stockholders (Reconciliation Of Basic To Diluted Weighted Average Common Shares Outstanding) (Details)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Weighted Average Number of Shares Outstanding Reconciliation [Line Items]
Basic	136,130,000	[1]	122,966,000		116,904,000
Dilutive common stock options	0	[1],[2]	183,000	[2]	190,000	[2]
Contingently issuable - performance shares	0	[1]	180,000		424,000
Convertible notes dilution	0	[1],[3]	2,991,000	[3]	1,697,000	[3]
Diluted	136,130,000	[1]	126,320,000		119,215,000
Stock Options [Member]
Weighted Average Number of Shares Outstanding Reconciliation [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount	135,190		129,918
Unvested Performance units [Member]
Weighted Average Number of Shares Outstanding Reconciliation [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount	200,360
Conversion rights [Member]
Weighted Average Number of Shares Outstanding Reconciliation [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount	1,087,401

[1] (a)The following common share equivalents were excluded from the weighted average diluted shares for the year ended December 31, 2013 because they would have been anti-dilutive to the loss recorded for the period: (i) 135,190 outstanding options to purchase the Company's common stock, (ii) 200,360 common shares attributable to unvested performance awards and (iii) 1,087,401 common shares related to the 2013 redemption of the Convertible Senior Notes, representing the weighted average portion of the year that is not included in the basic weighted average common shares outstanding.

[2] (b)Options to purchase 129,918 shares of the Company's common stock were excluded from the diluted income per share calculations for the year ended December 31, 2012 because they would have been anti-dilutive to the calculation.

[3] (c)Weighted average common shares outstanding have been increased to reflect the dilutive effect that would have resulted if the Convertible Senior Notes had qualified for and been converted during the years ended December 31, 2012 and 2011, respectively.

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Acquisitions and Divestitures (Components of Discontinued Operations) (Details) (USD $)	12 Months Ended										3 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Barnett Shale Field [Member]	Dec. 31, 2013 Discontinued Operations [Member]		Dec. 31, 2012 Discontinued Operations [Member]		Dec. 31, 2011 Discontinued Operations [Member]		Sep. 30, 2012 Discontinued Operations [Member] Pioneer Alaska [Member]	Dec. 31, 2013 Discontinued Operations [Member] Pioneer Alaska [Member]	Dec. 31, 2013 Discontinued Operations [Member] Barnett Shale Field [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Oil and gas	$ 3,155,696,000	$ 2,575,311,000	$ 2,080,215,000		$ 260,503,000		$ 285,542,000		$ 314,124,000
Interest and other	16,961,000	(1,032,000)	29,382,000		38,642,000		29,437,000		45,145,000
Gain on disposition of assets, net	209,021,000	45,898,000	(3,644,000)		8,764,000	[1]	40,735,000	[1]	645,241,000	[1]	12,600,000		8,700,000
Total revenues and other income from discontinued operations					307,909,000		355,714,000		1,004,510,000
Oil and gas production	614,676,000	558,045,000	396,961,000		90,333,000		79,853,000		55,698,000
Production and Ad Valorem Taxes From Discontinued Operations	201,186,000	178,723,000	139,425,000		10,151,000		9,034,000		8,239,000
Depletion, depreciation and amortization	907,077,000	708,270,000	489,579,000		103,787,000	[2]	101,921,000	[2]	130,606,000	[2]
Impairment of oil and gas properties	1,495,242,000	0	354,408,000	532,600,000	729,305,000	[3]	532,589,000	[3]	0	[3]		539,800,000	189,500,000
Exploration Abandonment and Impairment Expense	98,448,000	98,285,000	80,691,000		52,707,000		108,076,000		44,898,000
General and administrative	295,868,000	244,196,000	189,985,000		12,261,000		6,061,000		13,517,000
Accretion of discount on asset retirement obligations	11,862,000	8,677,000	7,506,000		831,000		2,731,000		3,436,000
Interest	183,750,000	204,222,000	181,604,000		0		0		829,000
Other	137,386,000	114,175,000	63,071,000		9,021,000		2,096,000		5,849,000
Costs and expenses, Total	4,281,229,000	2,235,001,000	1,917,179,000		1,008,396,000		842,361,000		263,072,000
Income from discontinued operations before income taxes					(700,487,000)		(486,647,000)		741,438,000
Current	(10,599,000)	(4,259,000)	(6,948,000)		(5,591,000)		(10,387,000)		(46,012,000)
Deferred	222,374,000	(286,229,000)	(181,330,000)		256,473,000		192,824,000		(221,302,000)
Income (loss) from discontinued operations	(449,605,000)	(304,210,000)	474,124,000		(449,605,000)		(304,210,000)		474,124,000
Alaskan Petroleum Production Tax Credit	$ 38,600,000	$ 29,300,000	$ 38,900,000

[1] (a)Primarily comprised of Alaskan Petroleum Production Tax credits on qualifying capital expenditures of $38.6 million, $29.3 million and $38.9 million for the years ended December 31, 2013, 2012 and 2011, respectively.

[2] (b)Represents significant noncash components of discontinued operations.

[3] (c)Represents a noncash impairment charge of $539.8 million on Pioneer Alaska net assets during the year ended December 31, 2013 and noncash impairment charges of $189.5 million and $532.6 million during the years ended December 31, 2013 and 2012, respectively, on the Company's net assets in the Barnett Shale field. See Note D for additional information regarding the noncash impairment charges.

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Net Income (Loss) Per Share Attributable To Common Stockholders (Tables)

12 Months Ended

Dec. 31, 2013

Earnings Per Share [Abstract]

Reconciliation Of Earnings Attributable To Common Stockholders, Basic And Diluted

The following table is a reconciliation of the Company's net income (loss) attributable to common stockholders to basic net income (loss) attributable to common stockholders and to diluted net income (loss) attributable to common stockholders for the years ended December 31, 2013, 2012 and 2011:

	Year Ended December 31, 2013
	Continuing Operations			Discontinued Operations			Total
	(in thousands)
Net loss attributable to common stockholders	$	(388,809	)	$	(449,605	)	$	(838,414	)
Participating basic earnings (a)	(60		)	(70		)	(130		)
Basic loss attributable to common stockholders	(388,869		)	(449,675		)	(838,544		)
Reallocation of participating earnings (a)	—			—			—
Diluted loss attributable to common stockholders	$	(388,869	)	$	(449,675	)	$	(838,544	)

	Year Ended December 31, 2012
	Continuing Operations			Discontinued Operations			Total
	(in thousands)
Net income (loss) attributable to common stockholders	$	496,495		$	(304,210	)	$	192,285
Participating basic earnings (a)	(2,160		)	(869		)	(3,029		)
Basic income (loss) attributable to common stockholders	494,335			(305,079		)	189,256
Reallocation of participating earnings (a)	115			46			161
Diluted income (loss) attributable to common stockholders	$	494,450		$	(305,033	)	$	189,417

	Year Ended December 31, 2011
	Continuing Operations			Discontinued Operations			Total
	(in thousands)
Net income attributable to common stockholders	$	360,365		$	474,124		$	834,489
Participating basic earnings (a)	(6,554		)	(8,624		)	(15,178		)
Basic net income attributable to common stockholders	353,811			465,500			819,311
Reallocation of participating earnings (a)	166			219			385
Diluted income attributable to common stockholders	$	353,977		$	465,719		$	819,696

 ______________________

(a) Unvested restricted stock awards and Pioneer Southwest phantom unit awards (prior to the December 2013 Pioneer Southwest merger) represent participating securities because they participate in nonforfeitable dividends or distributions with the common equity owners of the Company or Pioneer Southwest, as applicable. Participating share- or unit-based earnings represent the distributed and undistributed earnings of the Company attributable to the participating securities. Unvested restricted stock awards and phantom unit awards do not participate in undistributed net losses as they are not contractually obligated to do so.

Reconciliation Of Basic To Diluted Weighted Average Common Shares Outstanding

The following table is a reconciliation of basic weighted average common shares outstanding to diluted weighted average common shares outstanding for the years ended December 31, 2013, 2012 and 2011:

	Year Ended December 31,
	2013 (a)	2012	2011
	(in thousands)
Weighted average common shares outstanding:
Basic	136,130	122,966	116,904
Dilutive common stock options (b)	—	183	190
Contingently issuable—performance shares	—	180	424
Convertible Senior Notes dilution (c)	—	2,991	1,697
Diluted	136,130	126,320	119,215

______________________

(a) The following common share equivalents were excluded from the weighted average diluted shares for the year ended December 31, 2013 because they would have been anti-dilutive to the loss recorded for the period: (i) 135,190 outstanding options to purchase the Company's common stock, (ii) 200,360 common shares attributable to unvested performance awards and (iii) 1,087,401 common shares related to the 2013 redemption of the Convertible Senior Notes, representing the weighted average portion of the year that is not included in the basic weighted average common shares outstanding.

(b) Options to purchase 129,918 shares of the Company's common stock were excluded from the diluted income per share calculations for the year ended December 31, 2012 because they would have been anti-dilutive to the calculation.

(c) Weighted average common shares outstanding have been increased to reflect the dilutive effect that would have resulted if the Convertible Senior Notes had qualified for and been converted during the years ended December 31, 2012 and 2011, respectively.

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Consolidated Statements Of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (799,549)	$ 242,822	$ 881,914
Other comprehensive activity:
Net hedge (gains) losses included in continuing operations	0	4,855	(32,636)
Income tax (benefit) provision	0	(1,725)	8,407
Other comprehensive activity	0	3,130	(24,229)
Comprehensive income (loss)	(799,549)	245,952	857,685
Comprehensive income attributable to the noncontrolling interests	(38,865)	(50,537)	(33,687)
Comprehensive income (loss) attributable to common stockholders	$ (838,414)	$ 195,415	$ 823,998

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Income Taxes (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards	$ 328,874,000	[1],[2]	$ 509,485,000	[1],[2]
Payments for income taxes, net of tax refunds received	12,400,000		32,300,000		22,300,000
Unrecognized Tax Benefits	21,200,000
Tunisia and South Africa [Member]
Operating Loss Carryforwards [Line Items]
Payments for income taxes, net of tax refunds received			9,800,000		12,200,000
UNITED STATES
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards	917,400,000
COLORADO
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards	122,000,000
KANSAS
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration	32,000,000
Deferred Tax Assets, Operating Loss Carryforwards	50,600,000
Deferred Tax Assets, Valuation Allowance	$ 1,500,000

[1] Net operating loss carryforwards as of December 31, 2013 consist of $917.4 million of U.S. federal NOLs which expire primarily in 2032, $122.0 million of Colorado NOLs which expire between 2027 and 2033 and $50.6 million of Kansas NOLs which expire between 2018 and 2023.

[2] Net operating loss carryforwards as of December 31, 2013 are net of a $1.5 million valuation allowance relating to $32 million of Kansas NOLs that the Company believes will more likely than not expire unutilized.

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Summary Of Significant Accounting Policies

12 Months Ended

Dec. 31, 2013

Accounting Policies [Abstract]

Summary Of Significant Accounting Policies

NOTE B.    Summary of Significant Accounting Policies

Principles of consolidation. The consolidated financial statements include the accounts of the Company and its wholly-owned and majority-owned subsidiaries since their acquisition or formation. In accordance with generally accepted accounting principles in the United States ("GAAP"), the Company proportionately consolidates certain affiliate partnerships that are less than wholly-owned and are involved in oil and gas producing activities. All material intercompany balances and transactions have been eliminated.

Certain reclassifications have been made to the 2012 and 2011 financial statement and footnote amounts in order to conform them to the 2013 presentations.

In addition, the presentation of purchases and sales of third-party oil and gas has been revised in 2012 and 2011 to present separately the gross sales of purchased oil and gas and costs of purchased oil and gas. Previously, the sales and purchases were netted in other expense. Revenues and costs from the purchase and sale transactions are presented on a gross basis as the Company acts as a principal in the transactions by assuming the risks and rewards of ownership, including credit risk, of the oil and gas purchased and assumes responsibility to deliver the oil and gas volumes sold. This revision did not impact the Company's balance sheet, net income (loss) from continuing operations, equity or cash flows. While not material to the 2012 and 2011 financial statements as a whole, the presentation has been revised to enhance consistency. The following individual line items were affected in addition to total revenues and other income, and total costs and expenses:

	Year Ended December 31,
	2012		2011
	(in thousands)
Sales of purchased oil and gas, as previously reported	$	—	$	—
Revision of sales of purchased oil and gas	122,093		14,542
Sales of purchased oil and gas, reported herein	$	122,093	$	14,542
Purchased oil and gas, as previously reported	$	—	$	—
Revision of purchased oil and gas	120,408		13,949
Purchased oil and gas, reported herein	$	120,408	$	13,949
Other expense, as previously reported (excluding amounts included in discontinued operations)	$	112,490	$	62,478
Revision of other expense	1,685		593
Other expense, reported herein	$	114,175	$	63,071

Use of estimates in the preparation of financial statements. Preparation of the accompanying consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting periods. Depletion of oil and gas properties and impairment of goodwill and proved and unproved oil and gas properties, in part, is determined using estimates of proved, probable and possible oil and gas reserves. There are numerous uncertainties inherent in the estimation of quantities of proved, probable and possible reserves and in the projection of future rates of production and the timing of development expenditures. Similarly, evaluations for impairment of proved and unproved oil and gas properties are subject to numerous uncertainties including, among others, estimates of future recoverable reserves and commodity price outlooks. Actual results could differ from the estimates and assumptions utilized.

Cash and cash equivalents. The Company's cash and cash equivalents include depository accounts held by banks and marketable securities with original issuance maturities of 90 days or less.

Accounts receivable. As of December 31, 2013 and 2012, the Company had accounts receivable – trade, net of allowances for bad debts, of $430.7 million and $316.9 million, respectively. The Company's accounts receivable – trade are primarily comprised of oil and gas sales receivables, joint interest receivables and other receivables for which the Company does not require collateral security.

As of December 31, 2013 and 2012, the Company's allowances for doubtful accounts totaled $1.4 million and $1.5 million, respectively. The Company establishes allowances for bad debts equal to the estimable portions of accounts receivable for which failure to collect is considered probable. The Company estimates the portions of joint interest receivables for which failure to collect is probable based on percentages of joint interest receivables that are past due. The Company estimates the portions of other receivables for which failure to collect is probable based on the relevant facts and circumstances surrounding the receivable. Allowances for doubtful accounts are recorded as reductions to the carrying values of the receivables included in the Company's consolidated balance sheets and as charges to other expense in the consolidated statements of operations in the accounting periods during which failure to collect an estimable portion is determined to be probable.

Inventories. The Company's inventories consist of materials, supplies and commodities. The Company's materials and supplies inventory is primarily comprised of oil and gas drilling or repair items such as tubing, casing, proppant used to fracture-stimulate oil and gas wells, chemicals, operating supplies and ordinary maintenance materials and parts. The materials and supplies inventory is primarily acquired for use in future drilling operations or repair operations and is carried at the lower of cost or market, on a first-in, first-out cost basis. Valuation reserve allowances for materials and supplies inventories are recorded as reductions to the carrying values of the materials and supply inventories in the Company's consolidated balance sheets and as charges to other expense in the accompanying consolidated statements of operations.

Commodities inventories are carried at the lower of average cost or market, on a first-in, first-out basis. The Company's commodities inventories consist of oil held in storage and natural gas liquids ("NGLs") and gas pipeline fill volumes. Any valuation allowances of commodities inventories are recorded as reductions to the carrying values of the commodities inventories included in the Company's consolidated balance sheets and as charges to other expense in the consolidated statements of operations.

The following table presents the Company's materials and supplies and commodities inventories as of December 31, 2013 and 2012:

	Year Ended December 31,
	2013			2012
	(in thousands)
Materials and supplies (a)	$	210,792		$	258,962
Commodities	13,429			5,446
Less: Noncurrent materials and supplies (b)	(4,096		)	(67,352		)
	$	220,125		$	197,056

____________________

(a) As of December 31, 2013 and 2012, the Company's materials and supplies inventories were net of valuation reserve allowances of $31.8 million and $4.6 million, respectively. See Note D for additional information regarding inventory impairments.

(b) Included in other noncurrent assets in the Company's accompanying consolidated balance sheet.

Oil and gas properties. The Company utilizes the successful efforts method of accounting for its oil and gas properties. Under this method, all costs associated with productive wells and nonproductive development wells are capitalized while nonproductive exploration costs and geological and geophysical expenditures are expensed. The Company capitalizes interest on expenditures for significant development projects, generally when the underlying project is sanctioned, until such projects are ready for their intended use. For large development projects requiring significant upfront development costs to support the drilling and production of a planned group of wells, the Company continues to capitalize interest on the portion of the development costs attributable to the planned wells yet to be drilled.

The Company does not carry the costs of drilling an exploratory well as an asset in its consolidated balance sheets following the completion of drilling unless both of the following conditions are met:

(i) The well has found a sufficient quantity of reserves to justify its completion as a producing well.

(ii) The Company is making sufficient progress assessing the reserves and the economic and operating viability of the project.

Due to the capital intensive nature and the geographical location of certain projects, it may take an extended period of time to evaluate the future potential of an exploration project and the economics associated with making a determination on its commercial viability. In these instances, the project's feasibility is not contingent upon price improvements or advances in technology, but rather the Company's ongoing efforts and expenditures related to accurately predicting the hydrocarbon recoverability based on well information, gaining access to other companies' production data in the area, transportation or processing facilities and/or getting partner approval to drill additional appraisal wells. These activities are ongoing and are being pursued constantly. Consequently, the Company's assessment of suspended exploratory well costs is continuous until a decision can be made that the project has found sufficient proved reserves to sanction the project or is noncommercial and is charged to exploration and abandonments expense. See Note F for additional information regarding the Company's suspended exploratory well costs.

The Company owns interests in six gas processing plants and nine treating facilities. The Company is the operator of two of the gas processing plants and all nine of the treating facilities. The Company's ownership interests in the gas processing plants and treating facilities are primarily to accommodate handling the Company's gas production and thus are considered a component of the capital and operating costs of the respective fields that they service. To the extent that there is excess capacity at a plant or treating facility, the Company attempts to process third party gas volumes for a fee to keep the plant or treating facility at capacity. All revenues and expenses derived from third party gas volumes processed through the plants and treating facilities are reported as components of oil and gas production costs. Third party revenues generated from the processing plants and treating facilities in continuing operations for the three years ended December 31, 2013, 2012 and 2011 were $57.2 million, $34.4 million and $42.6 million, respectively. Third party expenses attributable to the processing plants and treating facilities in continuing operations for the same respective periods were $30.1 million, $26.5 million and $22.6 million. The capitalized costs of the plants and treating facilities are included in proved oil and gas properties and are depleted using the unit-of-production method along with the other capitalized costs of the field that they service.

The capitalized costs of proved properties are depleted using the unit-of-production method based on proved reserves. Costs of significant nonproducing properties, wells in the process of being drilled and development projects are excluded from depletion until the related project is completed and proved reserves are established or, if unsuccessful, impairment is determined.

Proceeds from the sales of individual properties and the capitalized costs of individual properties sold or abandoned are credited and charged, respectively, to accumulated depletion, depreciation and amortization, if doing so does not materially impact the depletion rate of an amortization base. Generally, no gain or loss is recognized until an entire amortization base is sold. However, gain or loss is recognized from the sale of less than an entire amortization base if the disposition is significant enough to materially impact the depletion rate of the remaining properties in the amortization base.

The Company performs assessments of its long-lived assets to be held and used, including proved oil and gas properties accounted for under the successful efforts method of accounting, whenever events or circumstances indicate that the carrying value of those assets may not be recoverable. An impairment loss is indicated if the sum of the expected future cash flows is less than the carrying amount of the assets. In these circumstances, the Company recognizes an impairment loss for the amount by which the carrying amount of the assets exceeds the estimated fair value of the assets. See Note D for additional information regarding the Company's impairment of proved oil and gas properties.

Unproved oil and gas properties are periodically assessed for impairment on a project-by-project basis. These impairment assessments are affected by the results of exploration activities, commodity price outlooks, planned future sales or expirations of all or a portion of such projects. If the estimated future net cash flows attributable to such projects are not expected to be sufficient to fully recover the costs invested in each project, the Company will recognize an impairment loss at that time.

Goodwill. During 2004, the Company recorded goodwill associated with a business combination, which represents the cost of an acquired entity over the net amounts assigned to assets acquired and liabilities assumed. In accordance with GAAP, goodwill is not amortized to earnings, but is assessed for impairment whenever events or circumstances indicate that impairment of the carrying value of goodwill is likely, but no less often than annually. If the carrying value of goodwill is determined to be impaired, it is reduced for the impaired value with a corresponding charge to earnings in the period in which it is determined to be impaired. During the third quarter of 2013, the Company performed a qualitative assessment of goodwill to determine whether it was more likely than not that the fair value of the Company's reporting unit was less than its carrying amount as a basis for determining whether it was necessary to perform the two-step goodwill impairment test. Based upon the results of the assessment, the Company determined that it was not likely that the Company's goodwill was impaired.

For the year ended December 31, 2013, the Company reduced the carrying value of goodwill by $23.8 million, reflecting the portion of the Company's goodwill related to assets sold or included in assets held for sale at December 31, 2013, primarily associated with the sale of 40 percent of Pioneer's interest in 207,000 net acres leased by the Company in the horizontal Wolfcamp Shale play in the southern portion of the Spraberry field in West Texas, and the planned sales of the Company's Alaska subsidiary and Barnett Shale net assets. See Note C for additional information regarding the Company's divestitures. At December 31, 2013, the Company performed a qualitative assessment of its remaining goodwill to determine whether it is more likely than not that the fair value of the Company's reporting unit is less than its carrying amount, and the Company determined that it is not likely that the Company's remaining goodwill is impaired.

Other property and equipment, net. Other property and equipment is recorded at cost. At December 31, 2013 and 2012, respectively, the net carrying value of other property and equipment consisted of the following:

	Year Ended December 31,
	2013 (a)		2012 (a)
	(in thousands)
Proved and unproved sand properties (b)	$	451,384	$	457,033
Equipment and rigs (c)	313,165		385,887
Land and buildings	344,554		259,629
Transportation equipment	41,397		44,928
Furniture and fixtures	47,905		43,614
Leasehold improvements	25,748		26,603
	$	1,224,153	$	1,217,694

____________________

(a) At December 31, 2013 and 2012, other property and equipment was net of accumulated depreciation of $458.4 million and $395.9 million, respectively.

(b) Includes sand mines, sales facilities and unproved leaseholds that primarily provide the Company and other unrelated customers with proppant used in the fracture stimulation of oil and gas wells.

(c) Includes drilling rigs, well servicing rigs and equipment and fracture stimulation equipment including assets owned by subsidiaries that provide drilling, pumping and well services on Company-operated properties. As of December 31, 2013, the Company owned 15 drilling rigs, eleven fracture stimulation fleets and other oilfield services equipment, including pulling units, fracture stimulation tanks, water transport trucks, hot oilers, blowout preventers, construction equipment and fishing tools. During December 2013, the Company committed to a plan to sell its majority interest in Sendero Drilling Company, LLC ("Sendero"), which owns the Company's 15 vertical drilling rigs, to Sendero's minority interest owner. Associated therewith, the Company has classified the assets and liabilities of Sendero, including $17.9 million of drilling rigs, as assets held for sale in the accompanying consolidated balance sheet as of December 31, 2013. See Note C for additional information.

The primary purposes of the Company's sand mines and drilling, pumping and well services operations are to accommodate the Company's drilling and producing operations by increasing the availability of supplies, equipment and services, rather than being dependent on third-party availability, and to contain associated costs. All intercompany gains or losses of the Company's sand mines and drilling, pumping and well services operations are eliminated.

Earnings from sales of proppant and from providing drilling, pumping and well services to third-party customers and working interest owners in Company-operated properties are included in interest and other income in the accompanying consolidated statements of operations.

The capitalized costs of proved sand properties are depleted using the unit-of-production method based on proved sand reserves. Equipment items are generally depreciated by individual component on a straight line basis over their economic useful lives, which are generally from two to 12 years. Leasehold improvements are amortized over the lesser of their economic useful lives or the underlying terms of the associated leases.

The Company evaluates other property and equipment for potential impairment whenever indicators of impairment are present. Circumstances that could indicate potential impairment include: significant adverse changes in industry trends and the economic outlook; legal actions; regulatory changes; and significant declines in utilization rates or oil and gas prices. If it is determined that other property and equipment is potentially impaired, the Company performs an impairment evaluation by estimating the future undiscounted net cash flow from the use and eventual disposition of other property and equipment grouped at the lowest level that cash flows can be identified. If the sum of the future undiscounted net cash flows is less than the net book value of the property, an impairment loss is recognized for the excess, if any, of the assets' net book value over its estimated fair value.

Investment in unconsolidated affiliate. During 2010, the Company formed EFS Midstream LLC ("EFS Midstream") to own and operate gas and liquids gathering, treating and transportation assets in the Eagle Ford Shale play in South Texas. During June 2010, the Company sold a 49.9 percent member interest in EFS Midstream to an unaffiliated third party for $46.4 million of cash proceeds. Associated therewith, the Company recorded a $46.2 million deferred gain that is being amortized as a reduction in production costs over a 20 year period, representing the term of a continuing commitment of Pioneer to deliver production volumes through EFS Midstream handling and gathering facilities. The deferred gain is included in other current and noncurrent liabilities in the Company's accompanying consolidated balance sheet.

The Company does not have control of EFS Midstream. Consequently, the Company accounts for this investment under the equity method of accounting for investments in unconsolidated affiliates. Under the equity method, the Company's investment in unconsolidated affiliates is increased for investments made and the investor's share of the investee's net income, and decreased for distributions received, the carrying value of member interests sold and the investor's share of the investee's net losses.

The Company's equity interest in the net income or loss of EFS Midstream is recorded in interest and other income, net of eliminations of the profit associated with gathering, treating and transportation fees charged to the Company by EFS Midstream, in the accompanying consolidated statements of operations. See Note M for the Company's equity interest in the net income of EFS Midstream for the years ended December 31, 2013, 2012 and 2011.

Asset retirement obligations. The Company records a liability for the fair value of an asset retirement obligation in the period in which it is incurred if a reasonable estimate of fair value can be made. Asset retirement obligations are generally capitalized as part of the carrying value of the long-lived asset to which it relates. Conditional asset retirement obligations meet the definition of liabilities and are recognized when incurred if their fair values can be reasonably estimated.

The Company records the current and noncurrent portions of asset retirement obligations in other current liabilities and other liabilities, respectively, in the accompanying consolidated balance sheets and expenditures are classified as cash used in operating activities in the accompanying consolidated statements of cash flows. See Note I for additional information about the Company's asset retirement obligations.

Treasury stock. Treasury stock purchases are recorded at cost. Upon reissuance, the cost of treasury shares held is reduced by the average purchase price per share of the aggregate treasury shares held.

Issuance of common stock. In February 2013, the Company issued 10.35 million shares of its common stock and realized $1.3 billion of cash proceeds, net of associated underwriting and offering expenses.

Noncontrolling interest in consolidated subsidiaries. The Company owns the majority interests in certain subsidiaries with operations in the United States. Prior to December 17, 2013, the Company owned a 0.1 percent general partner interest and a 52.4 percent limited partner interest in Pioneer Southwest Energy Partners L.P. ("Pioneer Southwest") and consolidated the financial position, results of operations and cash flows of Pioneer Southwest with those of Pioneer. Pioneer Southwest owned proved and unproved oil and gas properties in the Spraberry field in the Permian Basin of West Texas. On December 17, 2013, the holders of a majority of the outstanding common units of Pioneer Southwest approved an amended agreement and plan of merger, pursuant to which (i) all of the then outstanding common units of Pioneer Southwest were canceled and converted into the right to receive 0.2325 of a share of common stock of the Company and (ii) Pioneer Southwest became a wholly-owned subsidiary of the Company. The changes in the Company's ownership of Pioneer Southwest were accounted for by eliminating the noncontrolling interest attributable to Pioneer Southwest. See Note C for additional information about Pioneer Southwest and the amended agreement and plan of merger.

Noncontrolling interests in the net assets of consolidated subsidiaries totaled $13.2 million and $178.0 million as of December 31, 2013 and 2012, respectively. The Company recorded net income attributable to the noncontrolling interests of $38.9 million, $50.5 million and $47.4 million for the years ended December 31, 2013, 2012 and 2011, respectively.

In accordance with GAAP, the Company records transfers of any gains or losses, net of taxes, from noncontrolling interests in consolidated subsidiaries to additional paid in capital proportionate to the ownership after giving effect to the purchase or sale of common units. The following table presents the Company's net income or loss attributable to common stockholders adjusted for changes in equity as a result of transactions that changed the Company's ownership interest in Pioneer Southwest:

	Year Ended December 31,
	2013			2012			2011
	(in thousands)
Net income (loss) attributable to common stockholders	$	(838,414	)	$	192,285		$	834,489
Transfers from the noncontrolling interest in consolidated subsidiaries:
Increase in additional paid in capital from the sale of 1.8 million Pioneer Southwest common units during 2011, net of tax of $15.4 million	—			—			26,915
Increase in additional paid in capital from Pioneer Southwest's offering of 2.6 million common units during 2011, net of tax of $23.7 million	—			—			8,104
Decrease in additional paid in capital for deferred taxes recognized attributable to Pioneer Southwest's 2008 initial public offering of 9.5 million common units	—			(49,072		)	—
Increase in additional paid in capital from Pioneer Southwest merger	168,685			—			—
Increase in additional paid in capital from deferred taxes recognized attributable to Pioneer Southwest merger	200,091			—			—
Decrease in additional paid in capital from Pioneer Southwest merger transaction costs	(3,880		)	—			—
Net increase (decrease) in equity from transactions with noncontrolling interests	364,896			(49,072		)	35,019
Net income (loss) attributable to common stockholders and changes in equity from transactions with noncontrolling interests	$	(473,518	)	$	143,213		$	869,508

Revenue recognition. The Company recognizes revenue when it is realized or realizable and earned. Revenues are considered realized or realizable and earned when: (i) persuasive evidence of an arrangement exists, (ii) delivery has occurred or services have been rendered, (iii) the seller's price to the buyer is fixed or determinable and (iv) collectability is reasonably assured.

The Company uses the entitlements method of accounting for oil, NGLs and gas revenues. Sales proceeds in excess of the Company's entitlement are included in other liabilities and the Company's share of sales taken by others is included in other assets in the accompanying consolidated balance sheets.

The Company had no material oil or NGL entitlement assets or liabilities as of December 31, 2013 or 2012. The following table presents the Company's gas entitlement assets and liabilities with their associated volumes as of December 31, 2013 and 2012. Gas volumes are presented in millions of cubic feet ("MMCF").

	December 31,
	2013			2012
	Amount		Volume	Amount		Volume
	(dollars in millions)
Gas entitlement assets	$	7.4	2,990	$	6.8	2,870
Gas entitlement liabilities	$	2.5	715	$	1.9	582

The Company enters into oil and gas purchase transactions with third parties and separate sale transactions with third parties to satisfy unused pipeline capacity commitments and to diversify a portion of the Company's WTI oil sales to a Gulf Coast oil price.  Revenues and expenses from these transactions are presented on a gross basis as the Company acts as a principal in the transaction by assuming the risk and rewards of ownership, including credit risk, of the oil and gas purchased and assuming responsibility to deliver the oil and gas volumes sold. Deficiency payments on excess pipeline capacity are included in other expense in the accompanying consolidated statements of operations. See Note N for further information on transportation commitment charges.

The Company recognized revenue of $42.1 million and $45.0 million during 2012 and 2011, respectively from volumetric production payment ("VPP") agreements which represented limited-term overriding royalty interests in oil reserves that: (i) entitled the purchaser to receive production volumes over a period of time from specific lease interests, (ii) were free and clear of all associated production costs and capital expenditures associated with the reserves, (iii) were nonrecourse to the Company (i.e., the purchaser's only recourse was to the reserves acquired), (iv) transferred title of the reserves to the purchaser and (v) allowed the Company to retain the remaining reserves after the VPPs volumetric quantities had been delivered. The Company had no VPP obligations in 2013 as all VPP production volumes were delivered as of December 31, 2012; as such, the Company recognized no VPP revenue in 2013.

Derivatives. All derivatives are recorded in the accompanying consolidated balance sheets at estimated fair value. Effective February 1, 2009, the Company discontinued hedge accounting on all of its then-existing hedge contracts. The effective portions of the discontinued deferred hedges as of February 1, 2009 were included in accumulated other comprehensive income (loss) ("AOCI - Hedging") and were transferred to earnings during the same periods in which the forecasted hedged transactions were recognized in the Company's earnings. During 2012, the remaining AOCI - Hedging losses were transferred to earnings. Since discontinuing hedge accounting, the Company has recognized all changes in the fair values of its derivative contracts as gains or losses in the earnings of the periods in which they occur.

The Company classifies the fair value amounts of derivative assets and liabilities executed under master netting arrangements as net current or noncurrent derivative assets or net current or noncurrent derivative liabilities, whichever the case may be, by commodity and counterparty. Net derivative asset values are determined, in part, by utilization of the derivative counterparties' credit-adjusted risk-free rate curves and net derivative liabilities are determined, in part, by utilization of the Company's and, through the date of the merger, Pioneer Southwest's credit-adjusted risk-free rate curves. The credit-adjusted risk-free rate curves for the Company and the counterparties are based on their independent market-quoted credit default swap rate curves plus the United States Treasury Bill yield curve as of the valuation date. Pioneer Southwest's credit-adjusted risk-free rate curve was based on independent market-quoted forward London Interbank Offered Rate ("LIBOR") curves plus 162.5 basis points, representing Pioneer Southwest's estimated borrowing rate. See Note E for additional information about the Company's derivative instruments.

Environmental. The Company's environmental expenditures are expensed or capitalized depending on their future economic benefit. Expenditures that relate to an existing condition caused by past operations and that have no future economic benefits are expensed. Expenditures that extend the life of the related property or mitigate or prevent future environmental contamination are capitalized. Liabilities for expenditures that will not qualify for capitalization are recorded when environmental assessment and/or remediation is probable and the costs can be reasonably estimated. Such liabilities are undiscounted unless the timing of cash payments for the liability is fixed or reliably determinable. Environmental liabilities normally involve estimates that are subject to revision until settlement occurs.

Stock-based compensation. For stock-based compensation awards granted or modified, stock-based compensation expense is being recognized in the Company's financial statements on a straight line basis over the awards' vesting periods based on their fair values on the dates of grant or modification, as applicable. The stock-based compensation awards generally vest over a period not exceeding three years. The amount of stock-based compensation expense recognized at any date is approximately equal to the ratable portion of the grant date value of the award that is vested at that date. The Company utilizes (i) the Black-Scholes option pricing model to measure the fair value of stock options, (ii) the prior day's closing stock price on the date of grant for the fair value of restricted stock, restricted stock units, partnership unit awards or phantom unit awards that are expected to be settled in the Company's common stock ("Equity Awards"), (iii) the Monte Carlo simulation method for the fair value of performance unit awards and (iv) a probabilistic forecasted fair value method for Series B unit awards issued by Sendero.

Stock-based compensation liability awards are awards that are expected to be settled in cash on their vesting dates, rather than in equity shares or units ("Liability Awards"). Stock-based Liability Awards are recorded as accounts payable—affiliates based on the vested portion of the fair value of the awards on the balance sheet date. The fair values of Liability Awards are updated at each balance sheet date and changes in the fair values of the vested portions of the awards are recorded as increases or decreases to stock-based compensation expense.

Segments. Operating segments are defined as components of an enterprise that (i) engage in activities from which it may earn revenues and incur expenses (ii) for which separate operational financial information is available and is regularly evaluated by the chief operating decision maker for the purpose of allocating resources and assessing performance.

Based upon how the Company is organized and managed, the Company has only one reportable operating segment, which is oil and gas exploration and production. The Company considers its vertical integration services as ancillary to its oil and gas exploration and producing activities and manages these services to support such activities. In addition, the Company has a single, company-wide management team that allocates capital resources to maximize profitability and measures financial performance as a single enterprise.

Assets held for sale and discontinued operations. On the date at which the Company meets all the held for sale criteria, the Company discontinues the recording of depletion and depreciation of the assets or asset group to be sold and reclassifies the assets and related liabilities to be sold as held for sale on the accompanying consolidated balance sheets. The assets and liabilities are measured at the lower of their carrying amount or estimated fair value less cost to sell.

In addition, after determining that held for sale criteria has been met, the Company considers whether the held for sale assets meet the criteria to be considered discontinued operations. If the assets held for sale are considered discontinued operations, the Company classifies the results of operations from the assets held for sale as income or loss from discontinued operations, net of tax in the accompanying consolidated statements of operations for the current period and all prior periods. See Note C for additional information about the Company's divestitures.

New accounting pronouncements. In July 2013, the Financial Accounting Standards Boards issued Accounting Standards Update ("ASU") 2013-11, "Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists," which provides guidance on the presentation of unrecognized tax benefits. The adoption of ASU 2013-11 during the third quarter of 2013 did not have a material impact on the Company's financial position and had no impact on the Company's statements of operations or cash flows.

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Derivative Financial Instruments (Gas Volume And Weighted Average Price) (Details)	Dec. 31, 2013
Gas contracts, in MMBTU [Member] | Swap Contracts for Next Twelve Months [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	195,000
Gas contracts, in MMBTU [Member] | Swap Contracts for Year 2 [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	20,000
Gas contracts, in MMBTU [Member] | Swap Contracts for Year 3 [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	0
Gas contracts, in MMBTU [Member] | Collar Contracts With Short Puts for Next Twelve Months [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	115,000
Gas contracts, in MMBTU [Member] | Collar Contracts With Short Puts for Year 2 [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	285,000
Gas contracts, in MMBTU [Member] | Collar Contracts With Short Puts for Year 3 [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	20,000
Gas contracts, in MMBTU [Member] | Basis Swap Contracts for Next Twelve Months [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	85,082	[1]
Gas contracts, in MMBTU [Member] | Basis Swap Contracts for Year 2 [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	30,000	[1]
Gas contracts, in MMBTU [Member] | Basis Swap Contracts for Year 3 [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	0	[1]
Gas contracts, price per MMBTU [Member] | Swap Contracts for Next Twelve Months [Member]
Derivative [Line Items]
Derivative, Swap Type, Average Fixed Price	4.04
Gas contracts, price per MMBTU [Member] | Swap Contracts for Year 2 [Member]
Derivative [Line Items]
Derivative, Swap Type, Average Fixed Price	4.31
Gas contracts, price per MMBTU [Member] | Swap Contracts for Year 3 [Member]
Derivative [Line Items]
Derivative, Swap Type, Average Fixed Price	0.00
Gas contracts, price per MMBTU [Member] | Collar Contracts With Short Puts for Next Twelve Months [Member]
Derivative [Line Items]
Derivative, Average Cap Price	4.70
Derivative, Average Floor Price	4.00
Gas contracts, price per MMBTU [Member] | Collar Contracts With Short Puts for Next Twelve Months [Member] | Short Put [Member]
Derivative [Line Items]
Derivative, Notional Amount, Price Per Unit	3.00
Gas contracts, price per MMBTU [Member] | Collar Contracts With Short Puts for Year 2 [Member]
Derivative [Line Items]
Derivative, Average Cap Price	5.07
Derivative, Average Floor Price	4.00
Gas contracts, price per MMBTU [Member] | Collar Contracts With Short Puts for Year 2 [Member] | Short Put [Member]
Derivative [Line Items]
Derivative, Notional Amount, Price Per Unit	3.00
Gas contracts, price per MMBTU [Member] | Collar Contracts With Short Puts for Year 3 [Member]
Derivative [Line Items]
Derivative, Average Cap Price	5.36
Derivative, Average Floor Price	4.00
Gas contracts, price per MMBTU [Member] | Collar Contracts With Short Puts for Year 3 [Member] | Short Put [Member]
Derivative [Line Items]
Derivative, Notional Amount, Price Per Unit	3.00
Gas contracts, price per MMBTU [Member] | Basis Swap Contracts for Next Twelve Months [Member]
Derivative [Line Items]
Derivative, Swap Type, Average Fixed Price	(0.20)
Gas contracts, price per MMBTU [Member] | Basis Swap Contracts for Year 2 [Member]
Derivative [Line Items]
Derivative, Swap Type, Average Fixed Price	(0.18)
Gas contracts, price per MMBTU [Member] | Basis Swap Contracts for Year 3 [Member]
Derivative [Line Items]
Derivative, Swap Type, Average Fixed Price	0.00

[1] (a)Subsequent to December 31, 2013, the Company entered into additional basis swap contracts for 35,000 MMBTU per day of April through December 2014 production with a negative price differential of $0.27 per MMBTU between the relevant index price and the NYMEX price.

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Commitments And Contingencies (Future Minimum Transportation Fees) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]
Year 1 Transportation Agreements	$ 353,167
Year 2 Transportation Agreements	404,493
Year 3 Transportation Agreements	418,665
Year 4 Transportation Agreements	282,077
Year 5 Transportation Agreements	245,250
Thereafter	$ 773,868
Oil and Gas Delivery Commitments and Contracts, Daily Production	50,000

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Schedule of Compensation Expense for Each Type of Incentive Award (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Compensation Arrangement with Individual, Compensation Expense	$ 112,432		$ 86,084		$ 53,085
Income Tax Expense (Benefit)	(211,775)		290,488		188,278
Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Including Stock Options	5,000		3,100		619
Restricted Stock Equity Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Compensation Arrangement with Individual, Compensation Expense	56,165		48,876		32,861
Restricted Stock Liability Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Compensation Arrangement with Individual, Compensation Expense	40,404		22,419		10,882
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Compensation Arrangement with Individual, Compensation Expense	2,952	[1]	4,110	[1]	2,936	[1]
Performance Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Compensation Arrangement with Individual, Compensation Expense	9,131		6,162		4,500
Pioneer Southwest Ltip [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Compensation Arrangement with Individual, Compensation Expense	1,029		1,098		761
Sendero B Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Compensation Arrangement with Individual, Compensation Expense	1,020		982		1,020
Employee Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Compensation Arrangement with Individual, Compensation Expense	1,731		2,437		125
Compensation Expense For Incentive Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Income Tax Expense (Benefit)	$ 36,298		$ 27,901		$ 22,084

[1] (a)Cash proceeds received from stock option exercises during 2013, 2012 and 2011 amounted to $5.0 million, $3.1 million and $619 thousand, respectively.

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Summary Of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2013

Accounting Policies [Abstract]

Reclassification of Purchased Oil and Gas [Table Text Block]

The following individual line items were affected in addition to total revenues and other income, and total costs and expenses:

	Year Ended December 31,
	2012		2011
	(in thousands)
Sales of purchased oil and gas, as previously reported	$	—	$	—
Revision of sales of purchased oil and gas	122,093		14,542
Sales of purchased oil and gas, reported herein	$	122,093	$	14,542
Purchased oil and gas, as previously reported	$	—	$	—
Revision of purchased oil and gas	120,408		13,949
Purchased oil and gas, reported herein	$	120,408	$	13,949
Other expense, as previously reported (excluding amounts included in discontinued operations)	$	112,490	$	62,478
Revision of other expense	1,685		593
Other expense, reported herein	$	114,175	$	63,071

Schedule of Inventory, Current [Table Text Block]

The following table presents the Company's materials and supplies and commodities inventories as of December 31, 2013 and 2012:

	Year Ended December 31,
	2013			2012
	(in thousands)
Materials and supplies (a)	$	210,792		$	258,962
Commodities	13,429			5,446
Less: Noncurrent materials and supplies (b)	(4,096		)	(67,352		)
	$	220,125		$	197,056

____________________

(a) As of December 31, 2013 and 2012, the Company's materials and supplies inventories were net of valuation reserve allowances of $31.8 million and $4.6 million, respectively. See Note D for additional information regarding inventory impairments.

(b) Included in other noncurrent assets in the Company's accompanying consolidated balance sheet.

Other Property Plant and Equipment [Table Text Block]

At December 31, 2013 and 2012, respectively, the net carrying value of other property and equipment consisted of the following:

	Year Ended December 31,
	2013 (a)		2012 (a)
	(in thousands)
Proved and unproved sand properties (b)	$	451,384	$	457,033
Equipment and rigs (c)	313,165		385,887
Land and buildings	344,554		259,629
Transportation equipment	41,397		44,928
Furniture and fixtures	47,905		43,614
Leasehold improvements	25,748		26,603
	$	1,224,153	$	1,217,694

____________________

(a) At December 31, 2013 and 2012, other property and equipment was net of accumulated depreciation of $458.4 million and $395.9 million, respectively.

(b) Includes sand mines, sales facilities and unproved leaseholds that primarily provide the Company and other unrelated customers with proppant used in the fracture stimulation of oil and gas wells.

(c) Includes drilling rigs, well servicing rigs and equipment and fracture stimulation equipment including assets owned by subsidiaries that provide drilling, pumping and well services on Company-operated properties. As of December 31, 2013, the Company owned 15 drilling rigs, eleven fracture stimulation fleets and other oilfield services equipment, including pulling units, fracture stimulation tanks, water transport trucks, hot oilers, blowout preventers, construction equipment and fishing tools. During December 2013, the Company committed to a plan to sell its majority interest in Sendero Drilling Company, LLC ("Sendero"), which owns the Company's 15 vertical drilling rigs, to Sendero's minority interest owner. Associated therewith, the Company has classified the assets and liabilities of Sendero, including $17.9 million of drilling rigs, as assets held for sale in the accompanying consolidated balance sheet as of December 31, 2013. See Note C for additional information.

Schedule of Other Ownership Interests [Table Text Block]

The following table presents the Company's net income or loss attributable to common stockholders adjusted for changes in equity as a result of transactions that changed the Company's ownership interest in Pioneer Southwest:

	Year Ended December 31,
	2013			2012			2011
	(in thousands)
Net income (loss) attributable to common stockholders	$	(838,414	)	$	192,285		$	834,489
Transfers from the noncontrolling interest in consolidated subsidiaries:
Increase in additional paid in capital from the sale of 1.8 million Pioneer Southwest common units during 2011, net of tax of $15.4 million	—			—			26,915
Increase in additional paid in capital from Pioneer Southwest's offering of 2.6 million common units during 2011, net of tax of $23.7 million	—			—			8,104
Decrease in additional paid in capital for deferred taxes recognized attributable to Pioneer Southwest's 2008 initial public offering of 9.5 million common units	—			(49,072		)	—
Increase in additional paid in capital from Pioneer Southwest merger	168,685			—			—
Increase in additional paid in capital from deferred taxes recognized attributable to Pioneer Southwest merger	200,091			—			—
Decrease in additional paid in capital from Pioneer Southwest merger transaction costs	(3,880		)	—			—
Net increase (decrease) in equity from transactions with noncontrolling interests	364,896			(49,072		)	35,019
Net income (loss) attributable to common stockholders and changes in equity from transactions with noncontrolling interests	$	(473,518	)	$	143,213		$	869,508

Gas Entitlement Assets and Liabilities [Table Text Block]

The following table presents the Company's gas entitlement assets and liabilities with their associated volumes as of December 31, 2013 and 2012. Gas volumes are presented in millions of cubic feet ("MMCF").

	December 31,
	2013			2012
	Amount		Volume	Amount		Volume
	(dollars in millions)
Gas entitlement assets	$	7.4	2,990	$	6.8	2,870
Gas entitlement liabilities	$	2.5	715	$	1.9	582

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Incentive Plans (Schedule Of Assumptions To Estimate The Fair Value) (Details) (Performance Units [Member])	12 Months Ended
	Dec. 31, 2013 Rate	Dec. 31, 2012 Rate	Dec. 31, 2011 Rate
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	0.40%	0.40%	1.32%
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of volatilities	42.90%	49.00%	84.10%
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of volatilities	30.40%	33.60%	50.20%

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Interest And Other Income (Tables)

12 Months Ended

Dec. 31, 2013

Interest and Other Income [Abstract]

Interest And Other Income

The following table provides the components of the Company's interest and other income during the years ended December 31, 2013, 2012 and 2011:

	Year Ended December 31,
	2013			2012			2011
	(in thousands)
Other income	$	8,282		$	5,382		$	9,125
Equity interest in income of EFS Midstream	7,266			2,183			1,925
Deferred compensation plan income	5,954			1,872			1,657
Interest income	321			1,465			697
Income (loss) from vertical integration services (a)	(4,862		)	(11,934		)	15,978
Total interest and other income	$	16,961		$	(1,032	)	$	29,382

 ______________________

(a) Income (loss) from vertical integration services represent net margins that result from Company-provided fracture stimulation, drilling and related service operations, which are ancillary to and supportive of the Company's oil and gas joint operating activities, and do not represent intercompany transactions. For the three years ended December 31, 2013, 2012 and 2011, these net margins include $284.9 million, $247.8 million and $50.9 million of gross vertical integration revenues, respectively and $289.8 million, $259.7 million and $34.9 million of total vertical integration costs and expenses, respectively.

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Major Customer

12 Months Ended

Dec. 31, 2013

Concentration Risks, Types, No Concentration Percentage [Abstract]

Major Customers

NOTE L.     Major Customers

The Company's share of oil and gas production is sold to various purchasers who must be prequalified under the Company's credit risk policies and procedures. The Company records allowances for doubtful accounts based on the age of accounts receivables and the financial condition of its purchasers and, depending on facts and circumstances, may require purchasers to provide collateral or otherwise secure their accounts.

The following purchasers individually accounted for ten percent or more of the Company's consolidated oil, NGL and gas revenues, including the revenues from discontinued operations, in at least one of the three years ended December 31, 2013:

	Year Ended December 31,
	2013		2012		2011
Plains Marketing LP	26	%	25	%	16	%
Enterprise Products Partners L.P.	12	%	14	%	12	%
Occidental Energy Marketing Inc	12	%	13	%	14	%

The loss of any of these significant purchasers could have a material adverse effect on the ability of the Company to sell its oil and gas production.