10-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-K

ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE

SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2015

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: 1-9260

UNIT CORPORATION

(Exact name of registrant as specified in its charter)

Delaware	73-1283193
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)
7130 South Lewis, Suite 1000 Tulsa, Oklahoma	74136
(Address of principal executive offices)	(Zip Code)

(Registrant’s telephone number, including area code) (918) 493-7700

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 $.20 per share	NYSE
Rights to Purchase Series A Participating Cumulative Preferred Stock	NYSE

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 [ ]    No [x]

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Exchange Act.

Yes [ ]    No [x]

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 [x]    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 [x]    No [ ]

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K 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. [x]

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    [x] Accelerated filer    [ ] Non-accelerated filer    [ ] Smaller reporting company    [ ]

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).

Yes [ ]    No [x]

As of June 30, 2015, the aggregate market value of the voting and non-voting common equity (based on the closing price of the stock on the NYSE on June 30, 2015) held by non-affiliates was approximately $726,406,732. Determination of stock ownership by non-affiliates was made solely for the purpose of this requirement, and the registrant is not bound by these determinations for any other purpose.

Indicate the number of shares outstanding of each of the issuer’s classes of common stock, as of the latest practicable date.

Class	Outstanding at February 12, 2016
Common Stock, $0.20 par value per share	51,022,722 shares

DOCUMENTS INCORPORATED BY REFERENCE

Document	Parts Into Which Incorporated
Portions of the registrant’s definitive proxy statement (the Proxy Statement) with respect to its annual meeting of shareholders scheduled to be held on May 4, 2016. The Proxy Statement will be filed within 120 days after the end of the fiscal year to which this report relates.	Part III

Exhibit Index—See Page 121

FORM 10-K

UNIT CORPORATION

TABLE OF CONTENTS

		Page
	PART I
Item 1.	Business	1
Item 1A.	Risk Factors	22
Item 1B.	Unresolved Staff Comments	38
Item 2.	Properties	38
Item 3.	Legal Proceedings	38
Item 4.	Mine Safety Disclosures	39
	PART II
Item 5.	Market for the Registrant’s Common Equity, Related Stockholder Matters, and Issuer Purchases of Equity Securities	39
Item 6.	Selected Financial Data	41
Item 7.	Management’s Discussion and Analysis of Financial Condition and Results of Operation	42
Item 7A.	Quantitative and Qualitative Disclosures about Market Risk	70
Item 8.	Financial Statements and Supplementary Data	72
Item 9.	Changes in and Disagreements with Accountants on Accounting and Financial Disclosure	111
Item 9A.	Controls and Procedures	111
Item 9B.	Other Information	112
	PART III
Item 10.	Directors, Executive Officers, and Corporate Governance	112
Item 11.	Executive Compensation	113
Item 12.	Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters	114
Item 13.	Certain Relationships and Related Transactions, and Director Independence	114
Item 14.	Principal Accountant Fees and Services	114
	PART IV
Item 15.	Exhibits and Financial Statement Schedules	115
Signatures		120
Exhibit Index		121

DEFINITIONS

The following are explanations of some of the terms used in this report.

ARO – Asset retirement obligations.

ASC – FASB Accounting Standards Codification.

ASU – Accounting Standards Update.

Bcf – Billion cubic feet of natural gas.

Bcfe – Billion cubic feet of natural gas equivalent. Determined using the ratio of one barrel of crude oil or NGLs to six Mcf of natural gas.

Bbl – Barrel, or 42 U.S. gallons liquid volume.

Boe – Barrel of oil equivalent. Determined using the ratio of six Mcf of natural gas to one barrel of crude oil or NGLs.

BOKF – Bank of Oklahoma Financial Corporation.

Btu – British thermal unit, used in terms of gas volumes. Btu is used to refer to the amount of natural gas required to raise the temperature of one pound of water by one degree Fahrenheit at one atmospheric pressure.

Development drilling – The drilling of a well within the proved area of an oil or gas reservoir to the depth of a stratigraphic horizon known to be productive.

DD&A – Depreciation, depletion, and amortization.

FASB – Financial and Accounting Standards Board.

Finding and development costs – Costs associated with acquiring and developing proved natural gas and oil reserves which are capitalized under generally accepted accounting principles, including any capitalized general and administrative expenses.

Gross acres or gross wells – The total acres or wells in which a working interest is owned.

IF – Inside FERC (U.S. Federal Energy Regulatory Commission).

LIBOR – London Interbank Offered Rate.

MBbls – Thousand barrels of crude oil or other liquid hydrocarbons.

Mcf – Thousand cubic feet of natural gas.

Mcfe – Thousand cubic feet of natural gas equivalent. Determined using the ratio of one barrel of crude oil or NGLs to six Mcf of natural gas.

MMBbls – Million barrels of crude oil or other liquid hydrocarbons.

MMBoe – Million barrels of oil equivalents.

MMBtu – Million Btu’s.

MMcf – Million cubic feet of natural gas.

MMcfe – Million cubic feet of natural gas equivalent. Determined using the ratio of one barrel of crude oil or NGLs to six Mcf of natural gas.

Net acres or net wells – The sum of the fractional working interests owned in gross acres or gross wells.

NGLs – Natural gas liquids.

NYMEX – The New York Mercantile Exchange.

Play – A term applied by geologists and geophysicists identifying an area with potential oil and gas reserves.

DEFINITIONS — (Continued)

Producing property – A natural gas or oil property with existing production.

Proved developed reserves – 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; and through installed extraction equipment and infrastructure operational at the time of the reserves estimate . For additional information, see the SEC’s definition in Rule 4-10(a)(3) of Regulation S-X.

Proved reserves – Proved oil and gas reserves are those 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. For additional information, see the SEC’s definition in Rule 4-10(a)(2)(i) through (iii) of Regulation S-X.

Proved undeveloped reserves – Proved 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. For additional information, see the SEC’s definition in Rule 4-10(a)(4) of Regulation S-X.

Reasonable certainty (in regards to reserves) – If deterministic methods are used, reasonable certainty means a high degree of confidence that the quantities will be recovered. If probabilistic methods are used, there should be at least a 90% probability that the quantities actually recovered will equal or exceed the estimate.

Reliable technology – A grouping of one or more technologies (including computational methods) that has been field tested and has been demonstrated to provide reasonably certain results with consistency and repeatability in the formation being evaluated or in an analogous formation.

SARs – Stock appreciation rights.

Unconventional play – Plays targeting tight sand, carbonates, coal bed, or oil and gas shale reservoirs. The reservoirs tend to cover large areas and lack the readily apparent traps, seals, and discrete hydrocarbon-water boundaries that typically define conventional reservoirs. These reservoirs generally require horizontal wells and fracture stimulation treatments or other special recovery processes in order to produce economically.

Undeveloped acreage – Lease acreage on which wells have not been drilled or completed to a point that would permit the production of economic quantities of natural gas or oil regardless of whether the acreage contains proved reserves.

Well spacing – The regulation of the number and location of wells over an oil or gas reservoir, as a conservation measure. Well spacing is normally accomplished by order of the appropriate regulatory conservation commission.

Workovers – Operations on a producing well to restore or increase production.

WTI – West Texas Intermediate, the benchmark crude oil in the United States.

UNIT CORPORATION

Annual Report

For The Year Ended December 31, 2015

PART I

Item 1.     Business

Unless otherwise indicated or required by the context, the terms “Company”, “Unit”, “us”, “our”, “we”, and “its” refer to Unit Corporation or, as appropriate, one or more of its subsidiaries.

Our executive offices are at 7130 South Lewis, Suite 1000, Tulsa, Oklahoma 74136; our telephone number is (918) 493-7700.

Information regarding our annual reports on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K, and any amendments to these reports, will be made available in print, free of charge, to any shareholders who request them. They are also available on our internet website at www.unitcorp.com, as soon as reasonably practicable after we electronically file these reports with or furnish them to the Securities and Exchange Commission (SEC). Materials we file with the SEC may be read and copied at the SEC’s Public Reference Room at 100 F. Street, N.E. Room 1580, N.W., Washington, D.C. 20549. Information on the operation of the Public Reference Room may be obtained by calling the SEC at 1-800-SEC-0330. The SEC also maintains an Internet website at www.sec.gov that contains reports, proxy and information statements, and other information regarding our company that we file electronically with the SEC.

In addition, we post on our Internet website, www.unitcorp.com, copies of our corporate governance documents. Our corporate governance guidelines and code of ethics, and the charters of our Board’s Audit, Compensation, and Nominating and Governance Committees, are available free of charge on our website or in print to any shareholder who requests them. We may from time to time provide important disclosures to investors by posting them in the investor information section of our website, as allowed by SEC rules.

GENERAL

We were founded in 1963 as an oil and natural gas contract drilling company. Today, in addition to our drilling operations, we have operations in the exploration and production and mid-stream areas. We operate, manage, and analyze our results of operations through our three principal business segments:

• Oil and Natural Gas – carried out by our subsidiary Unit Petroleum Company. This segment explores, develops, acquires, and produces oil and natural gas properties for our own account.

• Contract Drilling – carried out by our subsidiary Unit Drilling Company. This segment contracts to drill onshore oil and natural gas wells for others and for our own account.

• Mid-Stream – carried out by our subsidiary Superior Pipeline Company, L.L.C. and its subsidiaries. This segment buys, sells, gathers, processes, and treats natural gas for third parties and for our own account.

Each of these companies may conduct operations through subsidiaries of their own.

The following table provides certain information about us as of February 12, 2016:

Oil and Natural Gas
Completed gross wells in which we own an interest	6,781
Contract Drilling
Number of drilling rigs available for use	94
Mid-Stream
Number of natural gas treatment plants we own	3
Number of processing plants we own	13
Number of natural gas gathering systems we own	25

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2015 SEGMENT OPERATIONS HIGHLIGHTS

Oil and Natural Gas

• Exceeded annual production guidance with total production of 20.0 MMBoe or a 9% increase over2014.

• Successfully completed three horizontal Wilcox wells with very strong results from recent well completions.

Contract Drilling

• Placed five new BOSS drilling rigs into service during the year.

• Sold 31 older, lower horsepower mechanical and SCR drilling rigs.

• Achieved the best safety performance record in history of company.

Mid-Stream

• Gas gathered volumes increased 11% over 2014.

• Gas processed volumes increased 13% over 2014.

• 102 new wells were connected to our gathering and processing facilities.

• Completed construction of the new fee-based Snow Shoe gathering system in Centre County, Pennsylvania. It became operational in January 2016.

FINANCIAL INFORMATION ABOUT SEGMENTS

See Note 16 of our Notes to Consolidated Financial Statements in Item 8 of this report for information with respect to each of our segment’s revenues, profits or losses, and total assets.

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OIL AND NATURAL GAS

General. We began to develop our exploration and production operations in 1979. Today, our wholly owned subsidiary, Unit Petroleum Company, conducts our exploration and production activities. Our producing oil and natural gas properties, unproved properties, and related assets are in the following locations:

Division	Location
West division	Western and Southern Texas, Colorado, Wyoming, Montana, North Dakota, New Mexico, Southern Louisiana, and Mississippi
East division	East Texas, Eastern Oklahoma, Arkansas, and Northern Louisiana
Central division	Western Oklahoma, Texas Panhandle, and Kansas

When we are the operator of a property, we generally attempt to use a drilling rig owned by our contract drilling segment, and we use our mid-stream segment to gather our gas if it is economical for us to develop a system in the area.

The following table presents certain information regarding our oil and natural gas operations as of December 31, 2015:

Our Divisions/Area	Number of Gross Wells	Number of Net Wells	Number of Gross Wells in Process	Number of Net Wells in Process	2015 Average Net Daily Production
					Natural Gas (Mcf)	Oil (Bbls)	NGLs (Bbls)
West division	1,370	482.44	4	3.02	48,759	1,864	4,220
East division	1,389	468.37	—	—	18,758	29	17
Central division	5,131	1,879.31	—	—	112,061	8,472	10,212
Total	7,890	2,830.12	4	3.02	179,578	10,365	14,449

As of December 31, 2015, we did not have any significant water floods, pressure maintenance operations, or any other material related activities that were in process.

Description and Location of Our Core Operations

West division. In our Wilcox play, located primarily in Polk, Tyler, and Hardin Counties, Texas, we completed 12 operated gross vertical wells (average working interest 90%) in 2015 and three operated gross horizontal wells (average working interest 92%) in 2015. All 15 wells were completed as gas/condensate producers. Annual production in our Wilcox play averaged 77.4 MMcfe per day (11% oil, 31% NGLs, 58% natural gas) which is an increase of approximately 19% as compared to 2014. We averaged 1.4 Unit drilling rigs operating during 2015 and currently plan to use one Unit drilling rig during 2016. We anticipate completing approximately four horizontal Wilcox wells primarily in the first quarter 2016. Additional wells may be drilled later in the year depending on commodity prices. In addition, we plan to complete approximately eight to 10 behind pipe gas and liquids zones located primarily in the Wilcox Gilly Field.

Central division. SOHOT (Southern Oklahoma Hoxbar Oil Trend) is a play located primarily in Grady County, Oklahoma that we first drilled in 2013. The producing horizon is named the Hoxbar which is an interval that contains several potential oil and gas sands which are generally 50 to 100 feet thick. During 2015, we completed 15 Hoxbar horizontal wells focused primarily on two Hoxbar benches named the Marchand oil zone and the Medrano gas liquids zone. Five of the wells were completed in the Hoxbar “Marchand” zone and 10 wells were completed in the Hoxbar “Medrano” zone. Production during the fourth quarter 2015 averaged 2,047 barrels of oil per day, 1,529 barrels of NGLs per day, and 22.1 MMcf of natural gas per day, which is a 117% increase over the fourth quarter 2014. The average working interest for the 15 wells is 86%. During 2015, we averaged approximately 1.7 Unit drilling rigs in SOHOT. For 2016, our current plan is to drill with one drilling rig through the end of the first quarter at which time we will release the drilling rig. Additional wells may be drilled later in the year depending on commodity prices.

In the Texas Panhandle District, which consists primarily of Granite Wash (GW) wells, daily production for 2015 averaged approximately 167 MMcfe per day (13% oil, 38% NGLs) which is an increase of 5% over 2014. We had first sales on nine horizontal GW wells, primarily in the first quarter of 2015 having an average working interest of 73%. For 2015, we

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averaged 0.3 Unit drilling rigs in the GW. For 2016, we anticipate drilling one horizontal well during the first quarter. Additional wells may be drilled later in the year depending on commodity prices.

In our Mississippian play in south central Kansas, the average daily production for 2015 was approximately 1,885 Boe per day (64% oil and 12% NGLs) which is an increase of 23% as compared to 2014. We had first sales on three operated horizontal Mississippian wells during the first quarter 2015 with a 100% average working interest. During 2015, we averaged 0.4 Unit drilling rigs in the Mississippian play. One or two Mississippian wells may be drilled in late 2016 depending on commodity prices.

In the Marmaton horizontal oil play in Beaver County, Oklahoma, we had first sales on three horizontal wells during the first quarter of 2015 with an average working interest of 70%. The daily average production rate for 2015 was approximately 2,500 Boe per day (57% oil and 16% NGLs) which is a decrease of 37% as compared to 2014. We do not anticipate drilling any new wells in the play during 2016.

East division. Over the last several years, activity in our East division has been limited due to low gas prices since this area does not generally have oil or NGLs associated with the gas.

Dispositions. In August 2013, we sold some of our Bakken property interests. The proceeds, net of related expenses, were $57.1 million. In addition, we had other non-core asset sales with proceeds, net of related expenses, of $21.7 million, $33.1 million, and $1.9 million for 2013, 2014, and 2015, respectively. Proceeds from these dispositions reduced the net book value of our full cost pool with no gain or loss recognized.

We determined the value of certain unproved oil and gas properties were diminished (in part or in whole) based on an impairment evaluation and our anticipated future exploration plans. Those determinations resulted in $73.7 million (in 2014) and $114.4 million (in 2015) of costs being added to the total of our capitalized costs being amortized. We incurred a $76.7 million pre-tax ($47.7 million net of tax) non-cash ceiling test write-down of our oil and natural gas properties in 2014. In 2015, we incurred non-cash ceiling test write-downs of our oil and natural gas properties of $1.6 billion pre-tax ($1.0 billion net of tax) in 2015 due to the inclusion of the impaired value of those unproved properties and a reduction of the 12-month average commodity prices during the year.

4

Well and Leasehold Data. The following tables identify certain information regarding our oil and natural gas exploratory and development drilling operations:

	Year Ended December 31,
	2015		2014		2013
	Gross	Net	Gross	Net	Gross	Net
Wells drilled:
Development:
Oil:
West division	2	0.66	4	0.37	1	0.08
East division	—	—	—	—	—	—
Central division	21	8.12	115	74.07	93	51.33
Total oil	23	8.78	119	74.44	94	51.41
Natural gas:
West division	15	13.50	7	6.09	9	8.60
East division	—	—	—	—	1	—
Central division	18	11.50	49	31.91	37	26.00
Total natural gas	33	25.00	56	38.00	47	34.60
Dry:
West division	1	1.00	1	0.80	3	1.35
East division	—	—	—	—	—	—
Central division	1	0.21	3	1.03	3	1.78
Total dry	2	1.21	4	1.83	6	3.13
Total development	58	34.99	179	114.27	147	89.14
Exploratory:
Oil:
West division	—	—	—	—	—	—
East division	—	—	—	—	—	—
Central division	—	—	1	0.93	—	—
Total oil	—	—	1	0.93	—	—
Natural gas:
West division	—	—	5	4.80	2	2.00
East division	—	—	—	—	—	—
Central division	—	—	—	—	—	—
Total natural gas	—	—	5	4.80	2	2.00
Dry:
West division	—	—	1	1.00	—	—
East division	—	—	—	—	—	—
Central division	—	—	—	—	—	—
Total dry	—	—	1	1.00	—	—
Total exploratory	—	—	7	6.73	2	2.00
Total wells drilled	58	34.99	186	121.00	149	91.14

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	Year Ended December 31,
	2015		2014 (1)		2013
	Gross	Net	Gross	Net	Gross	Net
Wells producing or capable of producing:
Oil:
West division	692	149.34	713	164.25	2,058	170.49
East division	28	1.79	42	1.91	42	1.91
Central division	907	498.75	997	497.10	891	426.75
Total oil	1,627	649.88	1,752	663.26	2,991	599.15
Natural gas:
West division	659	325.57	703	326.64	1,004	326.79
East division	1,358	466.22	1,401	466.79	1,435	472.68
Central division	4,217	1,376.94	4,265	1,390.05	4,266	1,382.62
Total natural gas	6,234	2,168.73	6,369	2,183.48	6,705	2,182.09
Total	7,861	2,818.61	8,121	2,846.74	9,696	2,781.24

_________________________ 

(1) During 2014, we had divestitures of 1,716 gross (37.31 net) wells.

As of February 12, 2016, we were drilling or participating in six gross (2.92 net) wells started during 2016.

Cost incurred for development drilling includes $58.6 million, $199.7 million, and $136.7 million in 2015, 2014, and 2013, respectively, to develop previously booked proved undeveloped oil and natural gas reserves.

The following table summarizes our leasehold acreage at December 31, 2015:

	Year Ended December 31, 2015
	Developed		Undeveloped		Total
	Gross	Net	Gross	Net (1)	Gross	Net
West division	271,564	85,851	134,701	86,085	406,265	171,936
East division	200,547	86,988	22,003	8,770	222,550	95,758
Central division	910,356	373,996	145,954	100,205	1,056,310	474,201
Total	1,382,467	546,835	302,658	195,060	1,685,125	741,895

_________________________ 

(1) Approximately 69% (West – 57%; East – 88%; and Central – 78%) of the net undeveloped acres are covered by leases that will expire in the years 2016—2018 unless drilling or production extends the terms of those leases. Currently, we do not have any material proved undeveloped (PUD) reserves attributable to acreage where the expiration date precedes the scheduled PUD reserve development plan.

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Price and Production Data. The following tables identify the average sales price, production volumes, and average production cost per equivalent barrel for our oil, NGLs, and natural gas production for the years indicated:

	Year Ended December 31,
	2015		2014			2013
Average sales price per barrel of oil produced:
Price before derivatives	$	45.04	$	89.32		$	95.18
Effect of derivatives	5.75		0.11			(0.12		)
Price including derivatives	$	50.79	$	89.43		$	95.06
Average sales price per barrel of NGLs produced:
Price before derivatives	$	10.12	$	30.95		$	31.79
Effect of derivatives	—		—			—
Price including derivatives	$	10.12	$	30.95		$	31.79
Average sales price per Mcf of natural gas produced:
Price before derivatives	$	2.25	$	4.03		$	3.33
Effect of derivatives	0.38		(0.11		)	(0.01		)
Price including derivatives	$	2.63	$	3.92		$	3.32

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	Year Ended December 31,
	2015		2014		2013
Oil production (MBbls):
West division
Jazz field	422		377		312
All other west division fields	258		256		378
Total west division	680		633		690
East division	11		8		16
Central division:
Mendota field	343		407		412
All other central division fields	2,749		2,796		2,242
Total central division	3,092		3,203		2,654
Total oil production (MBbls)	3,783		3,844		3,360
NGLs production (MBbls):
West division
Jazz field	1,275		989		788
All other west division fields	266		235		205
Total west division	1,541		1,224		993
East division	6		6		24
Central division:
Mendota field	1,127		1,117		1,050
All other central division fields	2,600		2,281		1,847
Total central division	3,727		3,398		2,897
Total NGLs production (MBbls)	5,274		4,628		3,914
Natural gas production (MMcf):
West division
Jazz field	2,423		2,066		1,471
All other west division fields	15,374		13,882		11,591
Total west division	17,797		15,948		13,062
East division	6,846		7,719		9,401
Central division:
Mendota field	1,320		7,555		9,138
All other central division fields	39,583		27,632		25,156
Total central division	40,903		35,187		34,294
Total natural gas production (MMcf)	65,546		58,854		56,757
Total production (MBoe):
West division
Jazz field	4,120		3,431		2,572
All other west division fields	1,067		1,084		1,288
Total west division	5,187		4,515		3,860
East division	1,158		1,301		1,607
Central division:
Mendota field	2,790		2,783		2,985
All other central division fields	10,847		9,682		8,282
Total central division	13,637		12,465		11,267
Total production (MBoe)	19,982		18,281		16,734
Average production cost per equivalent Bbl (1)	$	7.06	$	7.70	$	7.63

_______________________ 

(1) Excludes ad valorem taxes and gross production taxes.

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Our Jazz Wilcox field in South Texas, which includes Gilly, Segno, and Wildwood prospects and several smaller prospects, contained 24%, 17%, and 11% of our total proved reserves in 2015, 2014, and 2013, respectively, expressed on an oil equivalent barrels basis. Our Mendota field, located in the Granite Wash play in the Texas Panhandle, includes 14%, 17%, and 18%, respectively of our total proved reserves in 2015, 2014, and 2013, respectively, expressed on an oil equivalent barrels basis. There are no other fields besides these that accounted for more than 15% of our proved reserves.

Oil, NGLs, and Natural Gas Reserves. The following table identifies our estimated proved developed and undeveloped oil, NGLs, and natural gas reserves:

	Year Ended December 31, 2015
	Oil (MBbls)	NGLs (MBbls)	Natural Gas (MMcf)	Total Proved Reserves (MBoe)
Proved developed:
West division	4,051	10,216	120,184	34,298
East division	43	58	73,480	12,347
Central division	10,585	20,944	222,731	68,651
Total proved developed	14,679	31,218	416,395	115,296
Proved undeveloped:
West division	424	790	10,666	2,992
East division	—	—	4,377	729
Central division	1,632	5,679	53,430	16,216
Total proved undeveloped	2,056	6,469	68,473	19,937
Total proved	16,735	37,687	484,868	135,233

Oil, NGLs, and natural gas reserves cannot be measured exactly. Estimates of those reserves require extensive judgments of reservoir engineering data and are generally less precise than other estimates made in connection with financial disclosures. We use Ryder Scott Company L.P. (Ryder Scott), independent petroleum consultants, to audit the reserves prepared by our reservoir engineers. Ryder Scott has been providing petroleum consulting services throughout the world since 1937. Their summary report is attached as Exhibit 99.1 to this Form 10-K. The wells or locations for which reserve estimates were audited were taken from reserve and income projections prepared by us as of December 31, 2015 and comprised 79% of the total proved developed discounted future net income and 81% of the total proved discounted future net income (based on the SEC's unescalated pricing policy).

Our Reservoir Engineering department is responsible for reserve determination for the wells in which we have an interest. Their primary objective is to estimate the wells' future reserves and future net value to us. Data is incorporated from multiple sources including geological, production engineering, marketing, production, land, and accounting departments. The engineers are responsible for reviewing this information for accuracy as it is incorporated into the reservoir engineering database. Our internal audit group reviews the controls to help provide assurance all the data has been provided. New well reserve estimates are provided to management as well as the respective operational divisions for additional scrutiny. Major reserve changes on existing wells are reviewed on a regular basis with the operational divisions to confirm correctness and accuracy. As the external audit is being completed by Ryder Scott, the reservoir department performs a final review of all properties for accuracy of forecasting.

Technical Qualifications

Ryder Scott – Mr. Robert J. Paradiso was the primary technical person responsible for overseeing the estimate of the reserves, future production and income prepared by Ryder Scott.

Mr. Paradiso, an employee of Ryder Scott since 2008, is a Vice President and also serves as Project Coordinator, responsible for coordinating and supervising staff and consulting engineers in ongoing reservoir evaluation studies worldwide. Before joining Ryder Scott, Mr. Paradiso served in a number of engineering positions with Getty Oil Company, Texaco, Union Texas Petroleum, Amax Oil and Gas, Inc., Norcen Explorer, Inc., Amerac Energy Corporation, Halliburton Energy Services, Santa Fe Snyder Corp., and Devon Energy Corporation.

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Mr. Paradiso earned a Bachelor of Science degree in Petroleum Engineering from Texas Tech University in 1979, and is a registered Professional Engineer in the State of Texas. He is also a member of the Society of Petroleum Engineers (SPE).

In addition to gaining experience and competency through prior work experience, the Texas Board of Professional Engineers requires a minimum of fifteen hours of continuing education annually, including at least one hour in the area of professional ethics, which Mr. Paradiso fulfills. As part of his 2015 continuing education hours, Mr. Paradiso attended 2 hours of formalized training during the 2015 RSC Reserves Conference relating to the definitions and disclosure guidelines contained in the United States Securities and Exchange Commission Title 17, Code of Federal Regulations, Modernization of Oil and Gas Reporting, Final Rule released January 14, 2009 in the Federal Register. Mr. Paradiso attended an additional 31.5 hours of formalized in-house training during 2015 covering such topics as the SPE/WPC/AAPG/SPEE Petroleum Resources Management System, reservoir engineering, geoscience and petroleum economics evaluation methods, procedures and software and ethics for consultants.

Based on his educational background, professional training and more than 36 years of practical experience in the estimation and evaluation of petroleum reserves, Mr. Paradiso has attained the professional qualifications as a Reserves Estimator and Reserves Auditor set forth in Article III of the “Standards Pertaining to the Estimating and Auditing of Oil and Gas Reserves Information” promulgated by the SPE as of February 19, 2007. For more information regarding Mr. Paradiso’s geographic and job specific experience, please refer to the Ryder Scott Company website at http://www.ryderscott.com/Company/Employees.

The Company – Responsibility for overseeing the preparation of our reserve report is shared by our reservoir engineers Trenton Mitchell and David Morrill.

Mr. Mitchell earned a Bachelor of Science degree in Petroleum Engineering from Texas A&M University in 1994. He has been an employee of Unit since 2002. Initially, he was the Outside Operated Engineer and since 2003 he has served in the capacity of Reservoir Engineer and in 2010 he was promoted to Manager of Reservoir Engineering. Before joining Unit, he served in a number of engineering field and technical support positions with Schlumberger Well Services in their pumping services segment (formerly Dowell Schlumberger). He obtained his Professional Engineer registration from the State of Oklahoma in 2004 and has been a member of SPE since 1991.

Mr. Morrill received a Bachelor of Science degree in Natural Gas Engineering from Texas A&I University in 1970 and has spent 35 of his 40 years in the industry directly involved in reserve evaluation and appraisals, acquisitions, prospect reviews, and field studies. Included in this time were eight years working for the petroleum consulting firm Keplinger and Associates. He joined Unit in 2006 and since that time has shared responsibility for preparation of the company's reserve report. Mr. Morrill is a registered professional engineer in the State of Oklahoma and a member of the Society of Petroleum Evaluation Engineers (SPEE) and SPE.

As part of the continuing education requirement for maintaining their professional licenses Mr. Mitchell and Mr. Morrill have attended various seminars and forums to enhance their understanding of current standards and issues for reserves presentation. These forums have included those sponsored by various professional societies and professional service firms including Ryder Scott.

Definitions and Other. Proved oil, NGLs, and natural gas reserves, as defined in SEC Rule 4-10(a), are those quantities of oil and gas, which, by analysis of geoscience 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 – before the time the 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 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.

The area of the reservoir considered as proved includes:

• The area identified by drilling and limited by fluid contacts, if any, and

• 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 geosciences and engineering data.

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

Where direct observation from well penetrations has defined a highest known oil 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 geosciences, engineering or performance data and reliable technology establish the higher contact with reasonable certainty.

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:

• 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 other evidence using reliable technology establishes reasonable certainty of the engineering analysis on which the project or program was based; and

• The project has been approved for development by all necessary parties and entities, including governmental entities.

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

Proved undeveloped oil, NGLs, and natural gas reserves are proved 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. Reserves on undrilled acreage are 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. Undrilled locations can be classified as having 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. Under no circumstances can 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.

Proved Undeveloped Reserves. As of December 31, 2015, we had 65 gross proved undeveloped wells all of which we plan to develop within five years of initial disclosure at a net estimated cost of approximately $156.8 million. The future estimated development costs necessary to develop our proved undeveloped oil and natural gas reserves in the United States for the years 2016—2020, as disclosed in our December 31, 2015 oil and natural gas reserve report, are shown below:

Year	Number of Gross Wells Planned	Estimated Development Cost (In millions)
2016	15	$	19.3
2017	29	66.5
2018	19	65.0
2019	2	6.0
2020	—	—
	65	$	156.8

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Our proved undeveloped reserves reported at December 31, 2015 did not include reserves that we did not expect to develop within five years of initial disclosure of those reserves. Below is a summary of changes to our PUD reserves during 2015:

	Oil (MMBbls)		NGLs (MMBbls)		Natural Gas (Bcf)		Total (MMBoe)
Proved undeveloped reserves, January 1, 2015	5.2		12.7		146.1		42.2
Extensions and discoveries	0.1		0.6		8.7		2.2
Converted to developed	(0.7	)	(1.1	)	(15.6	)	(4.4	)
Revisions of previous estimates	(2.6	)	(5.7	)	(70.7	)	(20.1	)
Sales of reserves	—		—		—		—
Proved undeveloped reserves, December 31, 2015	2.0		6.5		68.5		19.9

During 2015, we converted 19 proved undeveloped wells into proved developed wells at a cost of approximately $58.6 million. The downward revision to previous estimates were due to a number of factors including the removal of PUDs that are not part of our five-year development plan due to the decline in prices causing them to be uneconomic to drill and also due to a reduction in anticipated future capital expenditures.

Our estimated proved reserves and the standardized measure of discounted future net cash flows of the proved reserves at December 31, 2015, 2014, and 2013, the changes in quantities, and standardized measure of those reserves for the three years then ended, are shown in the Supplemental Oil and Gas Disclosures included in Item 8 of this report.

Contracts. Our oil production is sold at or near our wells under purchase contracts at prevailing prices in accordance with arrangements customary in the oil industry. Our natural gas production is sold to intrastate and interstate pipelines as well as to independent marketing firms under contracts with terms generally ranging from one month to a year. Few of these contracts contain provisions for readjustment of price as most of them are market sensitive.

Customers. During 2015, sales to Sunoco Logistics and Valero Energy Corporation accounted for 19% and 15% of our oil and natural gas revenues, respectively. There was no other company that accounted for more than 10% of our oil and natural gas revenues. During 2015, our mid-stream segment purchased $57.6 million of our natural gas and NGLs production and provided gathering and transportation services of $7.6 million. Intercompany revenue from services and purchases of production between our mid-stream segment and our oil and natural gas segment has been eliminated in our consolidated financial statements. In 2014 and 2013, we eliminated intercompany revenues of $89.6 million and $91.0 million, respectively, attributable to the intercompany purchase of our production of natural gas and NGLs as well as gathering and transportation services.

CONTRACT DRILLING

General. Our contract drilling business is conducted through Unit Drilling Company. Through this company we drill onshore oil and natural gas wells for our own account as well as other oil and natural gas companies. Our drilling operations are located in Oklahoma, Texas, Louisiana, Kansas, Wyoming, and North Dakota. Until October 31, 2015, our drilling operations in Texas was conducted under Unit Drilling Texas, a subsidiary of Unit Drilling Company. Effective October 31, 2015, that subsidiary was merged into Unit Drilling Company.

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The following table identifies certain information concerning our contract drilling operations:

	Year Ended December 31,
	2015			2014			2013
Number of drilling rigs available for use at year end	94.0			89.0			121.0
Average number of drilling rigs owned during year	92.6			118.8			125.4
Average number of drilling rigs utilized	34.7			75.4			65.0
Utilization rate (1)	38		%	63		%	52		%
Average revenue per day (2)	$	20,950		$	17,318		$	17,486
Total footage drilled (feet in 1,000’s)	7,237			12,551			10,578
Number of wells drilled	516			894			793

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(1) Utilization rate is determined by dividing the average number of drilling rigs used by the average number of drilling rigs owned during the year.

(2) Represents the total revenues from our contract drilling operations divided by the total number of days our drilling rigs were used during the year.

Description and Location of Our Drilling Rigs. An on-shore drilling rig is composed of major equipment components like engines, drawworks or hoists, derrick or mast, substructure, pumps to circulate the drilling fluid, blowout preventers, and drill pipe. As a result of the normal wear and tear from operating 24 hours a day, several of the major components, like engines, mud pumps, and drill pipe, must be replaced or rebuilt on a periodic basis. Other major components, like the substructure, mast, and drawworks, can be used for extended periods of time with proper maintenance. We also own additional equipment used in the operation of our drilling rigs, including top drives, iron roughnecks, automated catwalks, skidding systems, large air compressors, trucks, and other support equipment.

The maximum depth capacities of our various drilling rigs range from 9,500 to 40,000 feet to cover a wide range of our customers drilling requirements. In 2015, 81 of our 94 drilling rigs were used in drilling services.

The following table shows certain information about our drilling rigs (including their distribution) as of February 12, 2016:

Divisions	Contracted Rigs	Non-Contracted Rigs	Total Rigs	Average Rated Drilling Depth (ft)
Mid-Continent	10	35	45	16,867
Panhandle (1)	2	13	15	14,900
Gulf Coast (1)	2	10	12	21,000
Rocky Mountain	8	14	22	20,000
Totals	22	72	94	17,798

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(1) In 2016, these divisions will be consolidated into the Mid-Continent division.

The cyclical nature of the drilling business is best reflected in drilling rig utilization rates. Drilling rig utilization was relatively flat throughout 2013 averaging 65 drilling rigs operating for the year. Then 2014 saw an increase of 17 drilling rigs running - going from 65 drilling rigs at the start of the year to 82 drilling rigs in November. The last month of 2014 reflects the beginning of the current downward market trend with a precipitous decline of 50 drilling rigs through the end of the first quarter of 2015 where we slowed to 31 operating drilling rigs. This level of utilization continued through August with the weakening of commodity prices through the end of the year. At the end of 2015, our active drilling rig count was 26.

Mid-Continent, Woodward, and Panhandle. We have long held a strong position and market presence in the mid-continent area of Oklahoma and the Texas Panhandle. This area is commonly referred to as the Anadarko Basin, which also encompasses portions of Kansas. Historically, the Anadarko Basin has been known as a gas producing area, but it is also rich in oil and NGLs production. During the last several years operators have focused their operations in this basin on the Cana Woodford, Granite Wash, Southern Oklahoma Hoxbar Oil Trend (SOHOT), Cleveland, Tonkawa, Marmaton, and Mississippian

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horizontal plays. Typically, three of our divisions work in this basin. During 2015, our Mid-Continent and Panhandle divisions averaged 14.2 and 4.1 drilling rigs operating, respectively. We have consolidated our Woodward division into the Panhandle division with the decline of drilling rig activity in this current market. At the end of 2015, these two divisions had 11 drilling rigs operating in Oklahoma and the Texas Panhandle. Additionally, two Mid-Continent drilling rigs were operating in the Permian Basin at the end of year.

Gulf Coast. Our Gulf Coast division provides drilling rigs to the onshore areas of Texas and Louisiana. During 2015, the Gulf Coast division averaged 4.0 drilling rigs operating. The Gulf Coast had one drilling rig working in East Texas and two drilling rigs operating in the Permian Basin at the end of 2015.

Rocky Mountains. Our Rocky Mountain division covers several states, including Colorado, Utah, Wyoming, Montana, and North Dakota. This vast area has produced a number of conventional and unconventional oil and gas fields. This division operated an average of 10.0 drilling rigs during 2015. We had four drilling rigs operating in the Pinedale Anticline of western Wyoming, four drilling rigs operating in the Bakken Shale of North Dakota, and two drilling rigs operating in the Niobrara play of eastern Colorado at the end of 2015.

In 2016, due to the current market conditions, we will further consolidate the divisions. Our Panhandle and Gulf Coast divisions will be consolidated into the Mid-Continent. We will then have two divisions, Mid-Continent and Rocky Mountain.

At any given time the number of drilling rigs we can work depends on a number of conditions besides demand, including the availability of qualified labor and the availability of needed drilling supplies and equipment. The impact of these conditions tends to affect the demand for our drilling rigs. Our average utilization rate for 2015, 2014, and 2013 was 38%, 63%, and 52%, respectively.

The following table shows the average number of our drilling rigs working by quarter for the years indicated:

	2015	2014	2013
First quarter	50.1	67.9	66.3
Second quarter	30.7	73.5	65.2
Third quarter	31.2	79.1	63.5
Fourth quarter	27.2	80.9	65.0

Drilling Rig Fleet. The following table summarizes the changes made to our drilling rig fleet in 2015. A more complete discussion of the changes follows the table:

Drilling rigs available for use at December 31, 2014	89
Drilling rigs sold (1)	—
Drilling rigs constructed	5
Total drilling rigs available for use at December 31, 2015	94

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(1) During 2015, we sold 31 drilling rigs previously removed from service in December 2014.

Dispositions, Acquisitions, and Construction.  During 2013, we sold four of our 2,000 horsepower electric drilling rigs and one 3,000 horsepower electric drilling rigs. All of these sales were to unaffiliated third-parties.

During the first quarter of 2014. we sold four additional idle 3,000 horsepower drilling rigs to an unaffiliated third party. The proceeds from that sale were used in our construction program for our new proprietary 1,500 horsepower, AC electric drilling rig, called the BOSS drilling rig.

During 2014, three BOSS drilling rigs were constructed and placed into service for third-party operators.

In December 2014, we removed from service 31 drilling rigs, some older top drives, and certain drill pipe no longer marketable in the current environment and based on the estimated market value from third-party assessments, we recorded a write-down of approximately $74.3 million, pre-tax. During the first quarter of 2015, we sold one of these drilling rigs to an unaffiliated third party. The proceeds of this sale, less costs to sell, exceeded the $0.3 million net book value of the drilling rig

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resulting in a gain of $7,900. During the second quarter, we recorded an additional write-down on the remaining drilling rigs and other equipment of approximately $8.3 million pre-tax based on the estimated market value from similar auctions. During the third quarter, we sold the remaining 30 drilling rigs and most of the equipment in an auction. The proceeds from the sale of those assets, less costs to sell, was less than the $11.0 million net book value resulting in a loss of $7.3 million pre-tax. Some of the equipment that was not sold at the auction will be sold within the next twelve months and remain classified as assets held for sale. The net book value of those assets is $0.6 million.

During the first half of 2015, five BOSS drilling rigs were constructed and placed into service for third-party operators. The long lead time components for three additional BOSS drilling rigs were ordered in 2014 in anticipation for future demand of the BOSS drilling rigs. However, with the decline in the demand in the drilling market, many of these long lead time components were either postponed for later delivery or canceled altogether. Currently, we do not have any contracts to build new BOSS drilling rigs.

Drilling Contracts. Our drilling contracts are generally obtained through competitive bidding on a well by well basis. Contract terms and payment rates vary depending on the type of contract used, the duration of the work, the equipment and services supplied, and other matters. We pay certain operating expenses, including the wages of our drilling rig personnel, maintenance expenses, and incidental drilling rig supplies and equipment. The contracts are usually subject to early termination by the customer subject to the payment of a fee. Our contracts also contain provisions regarding indemnification against certain types of claims involving injury to persons, property, and for acts of pollution. The specific terms of these indemnifications are subject to negotiation on a contract by contract basis.

The type of contract used determines our compensation. Contracts are generally one of three types: daywork; footage; or turnkey. Under a daywork contract, we provide the drilling rig with the required personnel and the operator supervises the drilling of the well. Our compensation is based on a negotiated rate to be paid for each day the drilling rig is used. Footage contracts usually require us to bear some of the drilling costs in addition to providing the drilling rig. We are paid on completion of the well at a negotiated rate for each foot drilled. Under turnkey contracts we drill the well to a specified depth for a set amount and provide most of the required equipment and services. We bear the risk of drilling the well to the contract depth and are paid when the contract provisions are completed. We may incur losses if we underestimate the costs to drill the well or if unforeseen events occur that increase our costs or result in the loss of the well. We did not have any footage or turnkey contracts in 2015, 2014, or 2013. Because market demand for our drilling rigs as well as the desires of our customers determine the types of contracts we use, we cannot predict when and if a part of our drilling will be conducted under footage or turnkey contracts.

The majority of our contracts are on a well-to-well basis, with the rest under term contracts. Term contracts range from six months to three years and the rates can either be fixed throughout the term or allow for periodic adjustments.

Customers. During 2015, QEP Resources, Inc. was our largest drilling customer accounting for approximately 25% of our total contract drilling revenues. Our work for this customer was under multiple contracts and our business was not substantially dependent on any of these individual contracts. Consequently, none of these individual contracts were considered to be material. No other third party customer accounted for 10% or more of our contract drilling revenues.

Our contract drilling segment also provides drilling services for our oil and natural gas segment. During 2015, 2014, and 2013, our contract drilling segment drilled 38, 134, and 105 wells, respectively, for our oil and natural gas segment, or 7%, 15%, and 13%, respectively, of the total wells drilled by our contract drilling segment. Depending on the timing of the drilling services performed on our properties those services may be deemed, for financial reporting purposes, to be associated with the acquisition of an ownership interest in the property. Revenues and expenses for these services are eliminated in our statement of operations, with any profit recognized reducing our investment in our oil and natural gas properties. The contracts for these services are issued under the similar terms and rates as the contracts entered into with unrelated third parties. By providing drilling services for the oil and natural gas segment, we eliminated revenue of $22.1 million, $89.5 million, and $64.3 million during 2015, 2014, and 2013, respectively, from our contract drilling segment and eliminated the associated operating expense of $18.3 million, $62.4 million, and $46.9 million during 2015, 2014, and 2013, respectively, yielding $3.8 million, $27.1 million, and $17.4 million during 2015, 2014, and 2013, respectively, as a reduction to the carrying value of our oil and natural gas properties.

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MID-STREAM

General. Our mid-stream operations are conducted through Superior Pipeline Company, L.L.C. and its subsidiaries. Its operations consist of buying, selling, gathering, processing, and treating natural gas. It operates three natural gas treatment plants, 13 processing plants, 25 active gathering systems, and approximately 1,464 miles of pipeline. Superior and its subsidiaries operate in Oklahoma, Texas, Kansas, Pennsylvania, and West Virginia.

The following table presents certain information regarding our mid-stream segment for the years indicated:

	Year Ended December 31,
	2015	2014	2013
Gas gathered—Mcf/day	353,771	319,348	309,554
Gas processed—Mcf/day	182,684	161,282	140,584
NGLs sold—gallons/day	577,513	733,406	543,602

Dispositions and Acquisitions. This segment did not have any significant dispositions or acquisitions during 2013, 2014, or 2015.

In 2014, our mid-stream segment had a $7.1 million pre-tax write-down of three of its systems, Weatherford, Billy Rose, and Spring Creek and in 2015, incurred a $27.0 million pre-tax write-down of its systems, Bruceton Mills, Spring Creek, and Midwell due to anticipated future cash flow and future development around these systems not being sufficient to support their carrying value. The estimated future cash flows were less than the carrying value on these systems.

Contracts. Our mid-stream segment provides its customers with a full range of gathering, processing, and treating services. These services are usually provided to each customer under long-term contracts (more than one year), but we do have some short-term contracts as well. Our customer agreements include the following types of contracts:

• Fee-Based Contracts. These contracts provide for a set fee for gathering, transporting, compressing, and treating services. Our mid-stream’s revenue is a function of the volume of natural gas and is not directly dependent on the value of the natural gas. For the year ended December 31, 2015, 68% of our mid-stream segment’s total volumes and 65% of its operating margins (as defined below) were under fee-based contracts.

• Commodity-Based Contracts. These contracts consist of several contract structure types. Under these contract structures, our mid-stream segment purchases the raw well-head natural gas and settles with the producer at a stipulated price while retaining all sales proceeds from third parties or retains a negotiated percentage of the sales proceeds from the residue natural gas and NGLs it gathers and processes, with the remainder being paid to the producer. For the year ended December 31, 2015, 32% of our mid-stream segment’s total volumes and 35% of operating margins (as defined below) were under commodity-cased contracts.

For each of the above contracts, operating margin is defined as total operating revenues less operating expenses and does not include depreciation, amortization, and impairment, general and administrative expenses, interest expense, or income taxes.

Customers. During 2015, ONEOK Partners, L.P., Tenaska Resources, LLC, and Laclede Group, Inc. accounted for approximately 29%, 18%, and 12%, respectively, of our mid-stream revenues. We believe that if we lost any of these identified customers, there are other customers available to purchase our gas and NGLs. During 2015, 2014, and 2013 this segment purchased $57.6 million, $80.9 million, and $83.0 million, respectively, of our oil and natural gas segment's natural gas and NGLs production, and provided gathering and transportation services of $7.6 million, $8.7 million, and $8.0 million, respectively. Intercompany revenue from services and purchases of production between this business segment and our oil and natural gas segment has been eliminated in our consolidated financial statements.

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VOLATILE NATURE OF OUR BUSINESS

The prevailing prices for oil, NGLs, and natural gas significantly affect our revenues, operating results, cash flow as well as our ability to grow our operations. Oil, NGLs, and natural gas prices have been volatile and we expect them to continue to be so. For each of the periods indicated, the following table shows the highest and lowest average prices our oil and natural gas segment received for its sales of oil, NGLs, and natural gas without taking into account the effect of derivatives:

	Oil Price per Bbl				NGLs Price per Bbl				Natural Gas Price per Mcf
Quarter	High		Low		High		Low		High		Low
2013
First	$	93.89	$	90.80	$	37.97	$	33.14	$	3.20	$	3.04
Second	$	92.85	$	89.97	$	32.17	$	28.94	$	4.04	$	3.73
Third	$	104.25	$	101.70	$	33.14	$	24.78	$	3.33	$	2.79
Fourth	$	97.34	$	91.15	$	36.33	$	31.92	$	3.36	$	3.08
2014
First	$	98.09	$	90.51	$	41.62	$	36.75	$	5.00	$	4.25
Second	$	102.62	$	98.76	$	35.45	$	25.70	$	4.38	$	4.15
Third	$	98.95	$	90.70	$	31.08	$	29.32	$	3.88	$	3.36
Fourth	$	82.30	$	54.22	$	29.02	$	19.49	$	3.96	$	3.31
2015
First	$	46.70	$	43.22	$	18.90	$	1.60	$	2.85	$	2.30
Second	$	54.37	$	49.28	$	15.41	$	10.21	$	2.50	$	2.11
Third	$	49.02	$	40.36	$	9.49	$	7.81	$	2.51	$	2.17
Fourth	$	42.21	$	33.29	$	12.81	$	9.03	$	2.12	$	1.64

Prices for oil, NGLs, and natural gas are subject to wide fluctuations in response to relatively minor changes in the actual or perceived supply of and demand for oil and natural gas, market uncertainty, and a variety of additional factors that are beyond our control, including:

• political conditions in oil producing regions;

• the ability of the members of the Organization of Petroleum Exporting Countries (OPEC) to agree on prices and their ability or willingness to maintain production quotas;

• actions taken by foreign oil and natural gas producing nations;

• the price of foreign oil imports;

• imports and exports of oil and liquefied natural gas;

• actions of governmental authorities;

• the domestic and foreign supply of oil, NGLs, and natural gas;

• the level of consumer demand;

• United States storage levels of oil, NGLs, and natural gas;

• weather conditions;

• domestic and foreign government regulations;

• the price, availability, and acceptance of alternative fuels;

• volatility in ethane prices causing rejection of ethane as part of the liquids processed stream; and

• worldwide economic conditions.

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These factors and the volatile nature of the energy markets make it impossible to predict with any certainty the future prices of oil, NGLs, and natural gas. Prices after 2015 year-end have declined below the price at December 31, 2015. You are encouraged to read the Risk Factors discussed in Item 1A of this report for additional risks that can impact our operations.

Our contract drilling operations are dependent on the level of demand in our operating markets. Both short-term and long-term trends in oil, NGLs, and natural gas prices affect demand. Because oil, NGLs, and natural gas prices are volatile, the level of demand for our services can also be volatile.

Our mid-stream operations provide us greater flexibility in delivering our (and third parties) natural gas and NGLs from the wellhead to major natural gas and NGLs pipelines. Margins received for the delivery of these natural gas and NGLs are dependent on the price for oil, NGLs, and natural gas and the demand for natural gas and NGLs in our area of operations. If the price of NGLs falls without a corresponding decrease in the cost of natural gas, it may become uneconomical to us to extract certain NGLs. The volumes of natural gas and NGLs processed are highly dependent on the volume and Btu content of the natural gas and NGLs gathered.

COMPETITION

All of our businesses are highly competitive and price sensitive. Competition in the contract drilling business traditionally involves factors such as demand, price, efficiency, condition of equipment, availability of labor and equipment, reputation, and customer relations.

Our oil and natural gas operations likewise encounter strong competition from other oil and natural gas companies. Many of these competitors have greater financial, technical, and other resources than we do and have more experience than we do in the exploration for and production of oil and natural gas.

Our drilling success and the success of other activities integral to our operations will depend, in part, during times of increased competition on our ability to attract and retain experienced geologists, engineers, and other professionals. Competition for these professionals can, at times, be extremely intense.

Our mid-stream segment competes with purchasers and gatherers of all types and sizes, including those affiliated with various producers, other major pipeline companies, as well as independent gatherers for the right to purchase natural gas and NGLs, build gathering and processing systems, and deliver the natural gas and NGLs once the gathering and processing systems are established. The principal elements of competition include the rates, terms, and availability of services, reputation, and the flexibility and reliability of service.

OIL AND NATURAL GAS PROGRAMS AND CONFLICTS OF INTEREST

Unit Petroleum Company serves as the general partner of 15 oil and gas limited partnerships. Two were formed for investment by third parties and 13 (the employee partnerships) were formed to allow certain of our qualified employees and our directors to participate in Unit Petroleum’s oil and gas exploration and production operations. The non-employee partnerships were formed in 1984 and two in 1986. Effective December 31, 2014, the 1984 partnership was dissolved. Employee partnerships were formed for each year beginning with 1984 and ending with 2011.

The employee partnerships formed in 1984 through 1999 have been combined into a single consolidated partnership. The employee partnerships each have a set annual percentage (ranging from 1% to 15%) of our interest that the partnership acquires in most of the oil and natural gas wells we drill or acquire for our own account during the year in which the partnership was formed. The total interest the participants have in our oil and natural gas wells by participating in these partnerships does not exceed one percent of our interest in the wells.

Under the terms of our partnership agreements, the general partner has broad discretionary authority to manage the business and operations of the partnership, including the authority to make decisions regarding the partnership’s participation in a drilling location or a property acquisition, the partnership’s expenditure of funds, and the distribution of funds to partners. Because the business activities of the limited partners and the general partner are not the same, conflicts of interest will exist and it is not possible to entirely eliminate these conflicts. Additionally, conflicts of interest may arise when we are the operator of an oil and natural gas well and also provide contract drilling services. In these cases, the drilling operations are conducted under drilling contracts containing terms and conditions comparable to those contained in our drilling contracts with non-affiliated operators. We believe we fulfill our responsibility to each contracting party and comply fully with the terms of the agreements which regulate these conflicts.

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These partnerships are further described in Notes 2 and 10 to the Consolidated Financial Statements in Item 8 of this report.

EMPLOYEES

As of February 12, 2016, we had approximately 671 employees in our contract drilling segment, 290 employees in our oil and natural gas segment, 140 employees in our mid-stream segment, and 78 in our general corporate area. None of our employees are members of a union or labor organization nor have our operations ever been interrupted by a strike or work stoppage. We consider relations with our employees to be satisfactory.

GOVERNMENTAL REGULATIONS

General. Our business depends on the demand for services from the oil and natural gas exploration and development industry, and therefore our business can be affected by political developments and changes in laws and regulations that control or curtail drilling for oil and natural gas for economic, environmental, or other policy reasons.

Various state and federal regulations affect the production and sale of oil and natural gas. All states in which we conduct activities impose varying restrictions on the drilling, production, transportation, and sale of oil and natural gas. The following discussion of certain laws and regulations affecting our operations should not be relied upon as an exhaustive review of all regulatory considerations affecting us, due to the multitude of complex federal, state, and local regulations, and their susceptibility to change by subsequent agency actions and court rulings, that may affect our operations.

Natural Gas Sales and Transportation. Under the Natural Gas Act of 1938, the Federal Energy Regulatory Commission (FERC) regulates the interstate transportation and the sale in interstate commerce for resale of natural gas. FERC’s jurisdiction over interstate natural gas sales has been substantially modified by the Natural Gas Policy Act under which FERC continued to regulate the maximum selling prices of certain categories of gas sold in “first sales” in interstate and intrastate commerce. Effective January 1, 1993, however, the Natural Gas Wellhead Decontrol Act (the Decontrol Act) deregulated natural gas prices for all “first sales” of natural gas. Because “first sales” include typical wellhead sales by producers, all natural gas produced from our natural gas properties is sold at market prices, subject to the terms of any private contracts which may be in effect. FERC’s jurisdiction over interstate natural gas transportation is not affected by the Decontrol Act.

Our sales of natural gas are affected by intrastate and interstate gas transportation regulation. Beginning in 1985, FERC adopted regulatory changes that have significantly altered the transportation and marketing of natural gas. These changes are intended by FERC to foster competition by, among other things, transforming the role of interstate pipeline companies from wholesale marketers of natural gas to the primary role of gas transporters. All natural gas marketing by the pipelines is required to divest to a marketing affiliate, which operates separately from the transporter and in direct competition with all other merchants. As a result of the various omnibus rulemaking proceedings in the late 1980s and the subsequent individual pipeline restructuring proceedings of the early to mid-1990s, interstate pipelines must provide open and nondiscriminatory transportation and transportation-related services to all producers, natural gas marketing companies, local distribution companies, industrial end users, and other customers seeking service. Through similar orders affecting intrastate pipelines that provide similar interstate services, FERC expanded the impact of open access regulations to certain aspects of intrastate commerce.

FERC has pursued other policy initiatives that have affected natural gas marketing. Most notable are (1) the large-scale divestiture of interstate pipeline-owned gas gathering facilities to affiliated or non-affiliated companies; (2) further development of rules governing the relationship of the pipelines with their marketing affiliates; (3) the publication of standards relating to the use of electronic bulletin boards and electronic data exchange by the pipelines to make available transportation information on a timely basis and to enable transactions to occur on a purely electronic basis; (4) further review of the role of the secondary market for released pipeline capacity and its relationship to open access service in the primary market; and (5) development of policy and promulgation of orders pertaining to its authorization of market-based rates (rather than traditional cost-of-service based rates) for transportation or transportation-related services upon the pipeline’s demonstration of lack of market control in the relevant service market.

As a result of these changes, independent sellers and buyers of natural gas have gained direct access to the particular pipeline services they need and are better able to conduct business with a larger number of counter parties. We believe these changes generally have improved the access to markets for natural gas while, at the same time, substantially increasing

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competition in the natural gas marketplace. However, we cannot predict what new or different regulations FERC and other regulatory agencies may adopt or what effect subsequent regulations may have on production and marketing of natural gas from our properties.

Although in the past Congress has been very active in the area of natural gas regulation as discussed above, the more recent trend has been in favor of deregulation and the promotion of competition in the natural gas industry. Thus, in addition to “first sales” deregulation, Congress also repealed incremental pricing requirements and natural gas use restraints previously applicable. There continually are legislative proposals pending in the Federal and state legislatures which, if enacted, would significantly affect the petroleum industry. At the present time, it is impossible to predict what proposals, if any, might actually be enacted by Congress or the various state legislatures and what effect, if any, these proposals might have on the production and marketing of natural gas by us. Similarly, and despite the trend toward federal deregulation of the natural gas industry, whether or to what extent that trend will continue or what the ultimate effect will be on the production and marketing of natural gas by us cannot be predicted.

Oil and Natural Gas Liquids Sales and Transportation. Our sales of oil and natural gas liquids currently are not regulated and are at market prices. The prices received from the sale of these products are affected by the cost of transporting these products to market. Much of that transportation is through interstate common carrier pipelines. Effective as of January 1, 1995, FERC implemented regulations generally grandfathering all previously approved interstate transportation rates and establishing an indexing system for those rates by which adjustments are made annually based on the rate of inflation, subject to certain conditions and limitations. These regulations may tend to increase the cost of transporting oil and natural gas liquids by interstate pipeline, although the annual adjustments could result in decreased rates in a given year. These regulations have generally been approved on judicial review. Every five years, FERC examines the relationship between the annual change in the applicable index and the actual cost changes experienced by the oil pipeline industry and makes any necessary adjustment in the index to be used during the ensuing five years. We are not able to predict with certainty what effect, if any, the periodic review of the index by FERC will have on us.

Exploration and Production Activities. Federal, state, and local agencies also have promulgated extensive rules and regulations applicable to our oil and natural gas exploration, production, and related operations. The states we operate in require permits for drilling operations, drilling bonds, and the filing of reports concerning operations and impose other requirements relating to the exploration of oil and natural gas. Many states also have statutes or regulations addressing conservation matters including provisions for the unitization or pooling of oil and natural gas properties, the establishment of maximum rates of production from oil and natural gas wells, and the regulation of spacing, plugging and, abandonment of such wells. The statutes and regulations of some states limit the rate at which oil and natural gas is produced from our properties. The federal and state regulatory burden on the oil and natural gas industry increases our cost of doing business and affects our profitability.

Because these rules and regulations are amended or reinterpreted frequently, we are unable to predict the future cost or impact of complying with these laws.

Environmental.

General. Our operations are subject to increasingly stringent federal, state, and local laws and regulations governing protection of the environment. These laws and regulations may require acquisition of permits before certain of our operations may be commenced and may restrict the types, quantities, and concentrations of various substances that can be released into the environment. Planning and implementation of protective measures are required to prevent accidental discharges. Spills of oil, natural gas liquids, drilling fluids, and other substances may subject us to penalties and cleanup requirements. Handling, storage, and disposal of both hazardous and non-hazardous wastes are subject to regulatory requirements.

The federal Clean Water Act, as amended by the Oil Pollution Act, the federal Clean Air Act, the federal Resource Conservation and Recovery Act, and their state counterparts, are the primary vehicles for imposition of such requirements and for civil, criminal, and administrative penalties and other sanctions for violation of their requirements. In addition, the federal Comprehensive Environmental Response Compensation and Liability Act and similar state statutes impose strict liability, without regard to fault or the legality of the original conduct, on certain classes of persons who are considered responsible for the release of hazardous substances into the environment. Such liability, which may be imposed for the conduct of others and for conditions others have caused, includes the cost of remedial action as well as damages to natural resources.

The EPA in 2015 established publicly owned treatment works (POTWs) effluent guidelines and standards for oil and gas extraction facilities which reflected current industry best practices for unconventional oil and gas extraction facilities.

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The EPA and the U.S. Army Corp of Engineers in 2015 proposed a new definition of the “waters of the United States,” which rules has been stayed by courts pending conformity with the definition U.S. Supreme Court previously established.

Endangered Species Act. The federal Endangered Species Act, referred to as the “ESA,” and analogous state laws regulate a variety of activities, including oil and gas development, which could have an adverse effect on species listed as threatened or endangered under the ESA or their habitats. The designation of previously unidentified endangered or threatened species could cause oil and natural gas exploration and production operators and service companies to incur additional costs or become subject to operating delays, restrictions or bans in affected areas, which impacts could adversely reduce the amount of drilling activities in affected areas. All three of our business segments could be subject to the effect of one or more species being listed as threatened or endangered within the areas of our operations. Numerous species have been listed or proposed for protected status in areas in which we provide or could in the future undertake operations. The U.S. Fish and Wildlife Service and the National Marine Fisheries in 2016 issued final revised definitions relating to impacts on critical habitats for potentially endangered species allowing exclusion of certain areas so long as they will not result in the extinction of the species. The presence of protected species in areas where we provide contract drilling or mid-stream services or conduct exploration and production operations could impair our ability to timely complete or carry out those services and, consequently, adversely affect our results of operations and financial position.

Climate Change. Recent scientific studies have suggested that emissions of certain gases, commonly referred to as “greenhouse gases,” or GHGs, may be contributing to warming of the Earth’s atmosphere. As a result there have been a variety of regulatory developments, proposals or requirements, and legislative initiatives that have been introduced in the United States (as well as other parts of the World) that are focused on restricting the emission of carbon dioxide, methane, and other greenhouse gases.

In 2007, the United States Supreme Court in Massachusetts, et al. v. EPA, held that carbon dioxide may be regulated as an “air pollutant” under the federal Clean Air Act if it represents a health hazard to the public. On December 7, 2009, the U.S. Environmental Protection Agency (EPA) responded to the Massachusetts, et al. v. EPA decision and issued a finding that the current and projected concentrations of GHGs in the atmosphere threaten the public health and welfare of current and future generations, and that certain GHGs from new motor vehicles and motor vehicle engines contribute to the atmospheric concentrations of GHG and hence to the threat of climate change. In addition, the EPA issued a final rule, effective in December 2009, requiring the reporting of GHG emissions from specified large (25,000 metric tons or more) GHG emission sources in the U.S., beginning in 2011 for emissions occurring in 2010. During 2010, the EPA proposed revisions to these reporting requirements to apply to all oil and gas production, transmission, processing, and other facilities exceeding certain emission thresholds. In September and November 2013, the EPA proposed further revisions to record keeping and reporting requirements, which have not yet been finalized. The adoption and implementation of any regulations imposing reporting obligations on, or limiting emissions of GHGs from, our equipment and operations could require us to incur additional costs to reduce emissions of GHGs associated with our operations or could adversely affect demand for the crude oil we gather, transport, store or otherwise handle in connection with our services. In addition, both President Obama and the Administrator of the EPA have repeatedly indicated their preference for comprehensive legislation to address this issue and create the framework for a clean energy economy, with the Obama Administration supporting an emission allowance system. Past proposed legislation in Congress has included an economy wide cap and trade program to reduce U.S. greenhouse gas emissions. Some states are also looking at similar types of laws and regulations.

The EPA in 2015 proposed rules to reduce methane and ozone-forming VOC emissions for new and modified sources in the oil and gas sector.

Hydraulic Fracturing. Our oil and natural gas segment routinely applies hydraulic-fracturing techniques to many of our oil and natural gas properties, including our unconventional resource plays in the Granite Wash of Texas and Oklahoma, the Marmaton of Oklahoma, the Wilcox of Texas, and the Mississippian of Kansas. The EPA is studying the potential environmental impacts of hydraulic fracturing, including the impact on drinking water sources and public health, and a committee of the U.S. House of Representatives has been conducting an investigation of hydraulic fracturing practices. Legislation has been introduced before Congress to provide for federal regulation of hydraulic fracturing and to require disclosure of the chemicals used in the fracturing process. The U.S. House of Representatives has previously passed a bill that would block the Department of Interior from regulating hydraulic fracturing in states that already have their own regulations in place; however, it is uncertain that such an act will ever be enacted and if enacted, it would likely be subject to a Presidential veto. In addition, certain states in which we operate, including Texas, Oklahoma, Kansas, Colorado, and Wyoming have adopted, and other states as well as municipalities and other local governmental entities in some states, have and others are considering adopting regulations and ordinances that could impose more stringent permitting, public disclosure of fracking fluids, waste disposal, and well construction requirements on these operations, and even restrict or ban hydraulic fracturing in

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certain circumstances. Any new laws, regulation, or permitting requirements regarding hydraulic fracturing could lead to operational delay, or increased operating costs or third party or governmental claims, and could result in additional burdens that could serve to delay or limit the drilling services we provide to third parties whose drilling operations could be impacted by these regulations or increase our costs of compliance and doing business as well as delay the development of unconventional gas resources from shale formations which are not commercial without the use of hydraulic fracturing. Restrictions on hydraulic fracturing could also reduce the amount of oil and natural gas that we are ultimately able to produce from our reserves.

Other; Compliance Costs. We cannot predict future legislation or regulations It is possible that such future laws, regulations, and/or ordinances could result in increasing our compliance costs or additional operating restrictions as well as those of our customers. It is also possible that such future developments could curtail the demand for fossil fuels which could adversely affect the demand for our services, which in turn could adversely affect our future results of operations. Likewise we cannot predict with any certainty whether any changes to temperature, storm intensity or precipitation patterns as a result of climate change (or otherwise) will have a material impact on our operations.

Compliance with applicable environmental requirements has not, to date, had a material effect on the cost of our operations, earnings, or competitive position. However, as noted above in connection with our discussion of the regulation of GHGs and hydraulic fracturing, compliance with amended, new or more stringent requirements of existing environmental regulations or requirements may cause us to incur additional costs or subject us to liabilities that may have a material adverse effect on our results of operations and financial condition.

FINANCIAL INFORMATION ABOUT GEOGRAPHIC AREAS

Historically, our revenues from our Canadian operations, as well as information relating to long-lived assets attributable to those operations were immaterial. We no longer have any interests there or any other international operations.

Item 1A. Risk Factors

FORWARD-LOOKING STATEMENTS/CAUTIONARY STATEMENT AND RISK FACTORS

This report contains “forward-looking statements” – meaning, statements related to future events within the meaning of Section 27A of the Securities Act of 1933, as amended and Section 21E of the Securities Exchange Act of 1934, as amended. All statements, other than statements of historical facts, included or incorporated by reference in this document which addresses activities, events or developments which we expect or anticipate will or may occur in the future, are forward-looking statements. The words “believes,” “intends,” “expects,” “anticipates,” “projects,” “estimates,” “predicts,” and similar expressions are used to identify forward-looking statements. This report modifies and supersedes documents filed by us before

this report. In addition, certain information that we file with the SEC in the future will automatically update and supersede information contained in this report.

These forward-looking statements include, among others, such things as:

• the amount and nature of our future capital expenditures and how we expect to fund our capital expenditures;

• the number of wells we plan to drill or rework;

• prices for oil, NGLs, and natural gas;

• demand for oil, NGLs, and natural gas;

• our exploration and drilling prospects;

• the estimates of our proved oil, NGLs, and natural gas reserves;

• oil, NGLs, and natural gas reserve potential;

• development and infill drilling potential;

• expansion and other development trends of the oil and natural gas industry;

• our business strategy;

• our plans to maintain or increase production of oil, NGLs, and natural gas;

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• the number of gathering systems and processing plants we plan to construct or acquire;

• volumes and prices for natural gas gathered and processed;

• expansion and growth of our business and operations;

• demand for our drilling rigs and drilling rig rates;

• our belief that the final outcome of our legal proceedings will not materially affect our financial results;

• our ability to timely secure third-party services used in completing our wells;

• our ability to transport or convey our oil, NGLs, or natural gas production to established pipeline systems;

• impact of federal and state legislative and regulatory actions impacting our costs and increasing operating restrictions or delays as well as other adverse impacts on our business;

• our projected production guidelines for the year;

• our anticipated capital budgets;

• the number of wells our oil and natural gas segment plans to drill during the year; and

• our estimates of the amounts of any ceiling test write-downs or other potential asset impairments we may be required to record in future periods.

These statements are based on certain assumptions and analyses made by us in light of our experience and our perception of historical trends, current conditions, and expected future developments as well as other factors we believe are appropriate in the circumstances. Whether actual results and developments will conform to our expectations and predictions is subject to a number of risks and uncertainties any one or combination of which could cause our actual results to differ materially from our expectations and predictions, including:

• the risk factors discussed in this document and in the documents (if any) we incorporate by reference;

• general economic, market, or business conditions;

• the availability of and nature of (or lack of) business opportunities that we pursue;

• demand for our land drilling services;

• changes in laws or regulations;

• decreases or increases in commodity prices; and

• other factors, most of which are beyond our control.

You should not place undue reliance on any of these forward-looking statements. Except as required by law, we disclaim any current intention to update forward-looking information and to release publicly the results of any future revisions we may make to forward-looking statements to reflect events or circumstances after the date of this document to reflect the occurrence of unanticipated events.

In order to help provide you with a more thorough understanding of the possible effects of some of these influences on any forward-looking statements made by us, the following discussion outlines some (but not all) of the factors that could in the future cause our consolidated results to differ materially from those that may be presented in any forward-looking statement made by us or on our behalf.

Demand for our contract drilling and mid-stream services is substantially dependent on the levels of expenditures by the oil and gas industry. A substantial or an extended decline in oil and gas prices could result in lower expenditures by the oil and gas industry, which could have a material adverse effect on our financial condition, results of operations and cash flows. Demand for our contract drilling and mid-stream services depends substantially on the level of expenditures by the oil and gas industry for the exploration, development and production of oil and natural gas reserves. These expenditures are generally dependent on the industry’s view of future oil and natural gas prices and are sensitive to the industry’s view of future economic growth and the resulting impact on demand for oil and natural gas. Declines, as well as anticipated declines, in oil and gas prices could also result in project modifications, delays or cancellations, general business disruptions, and delays in payment of, or nonpayment of, amounts that are owed to us. These effects could have a material adverse effect on our financial condition, results of operations and cash flows.

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The oil and gas industry has historically experienced periodic downturns, which have been characterized by diminished demand for oilfield services and downward pressure on the prices we charge. A significant downturn in the oil and gas industry could result in a reduction in demand for oilfield services and could adversely affect our financial condition, results of operations and cash flows.

Oil, NGLs, and Natural Gas Prices. In addition to the impact oil and gas prices may have on our contract drilling and mid-stream segments, the prices we receive for our oil, NGLs, and natural gas production have a direct impact on our revenues, profitability, and cash flow as well as our ability to meet our projected financial and operational goals. The prices for oil, NGLs, and natural gas are determined on a number of factors beyond our control, including:

• the demand for and supply of oil, NGLs, and natural gas;

• current weather conditions in the continental United States (which can greatly influence the demand and prices for natural gas at any given time);

• the amount and timing of oil, liquid natural gas, and liquefied petroleum gas imports and exports;

• the ability of current distribution systems in the United States to effectively meet the demand for oil, NGLs, and natural gas at any given time, particularly in times of peak demand which may result because of adverse weather conditions;

• the ability or willingness of the OPEC to set and maintain production levels for oil;

• oil and gas production levels by non-OPEC countries;

• the level of excess production capacity;

• political and economic uncertainty and geopolitical activity;

• governmental policies and subsidies;

• the costs of exploring for producing and delivering oil and gas;

• technological advances affecting energy consumption; and

• weather conditions.

Oil prices are extremely sensitive to influences domestic and foreign based on political, social or economic underpinnings, any one of which could have an immediate and significant effect on the price and supply of oil. In addition, prices of oil, NGLs, and natural gas have been at various times influenced by trading on the commodities markets. That trading, at times, has tended to increase the volatility associated with these prices resulting in large differences in prices even on a week-to-week and month-to-month basis. All of these factors, especially when coupled with the fact that much of our product prices are determined on a daily basis, can, and at times do, lead to wide fluctuations in the prices we receive.

Based on our 2015 production, a $0.10 per Mcf change in what we receive for our natural gas production, without the effect of derivatives, would result in a corresponding $520,000 per month ($6.2 million annualized) change in our pre-tax operating cash flow. A $1.00 per barrel change in our oil price, without the effect of derivatives, would have a $303,000 per month ($3.6 million annualized) change in our pre-tax operating cash flow and a $1.00 per barrel change in our NGLs price, without the effect of derivatives, would have a $419,000 per month ($5.0 million annualized) change in our pre-tax operating cash flow.

In order to reduce our exposure to short-term fluctuations in the price of oil, NGLs, and natural gas, we sometimes enter into derivative contracts such as swaps and collars. To date, we have derivatives in part, but not on all of our production which only provides price protection against declines in oil, NGLs, and natural gas prices on the production subject to our derivatives, but not otherwise. Should market prices for the production we have derivatives exceed the prices due under our derivative contracts, our derivative contracts then expose us to risk of financial loss and limit the benefit to us of those increases in market prices. During 2015, all of our NGLs volumes and about half of our oil and natural gas volumes were sold at market responsive prices. To help manage our cash flow and capital expenditure requirements, we had derivative contracts on approximately 24%

and 40% of our 2015 average daily production for oil and natural gas, respectively. A more thorough discussion of our derivative arrangements is contained in the Management’s Discussion and Analysis of Financial Condition and Results of Operations section of this report contained in Item 7.

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Uncertainty of Oil, NGLs, and Natural Gas Reserves; Ceiling Test. There are many uncertainties inherent in estimating quantities of oil, NGLs, and natural gas reserves and their values, including many factors beyond our control. The oil, NGLs, and natural gas reserve information included in this report represents only an estimate of these reserves. Oil, NGLs, and natural gas reservoir engineering is a subjective and an inexact process of estimating underground accumulations of oil, NGLs, and natural gas that cannot be measured in an exact manner. Estimates of economically recoverable oil, NGLs, and natural gas reserves depend on a number of variable factors, including historical production from the area compared with production from other producing areas, and assumptions concerning:

• reservoir size;

• the effects of regulations by governmental agencies;

• future oil, NGLs, and natural gas prices;

• future operating costs;

• severance and excise taxes;

• operational risks;

• development costs; and

• workover and remedial costs.

Some or all of these assumptions may vary considerably from actual results. For these and other reasons, estimates of the economically recoverable quantities of oil, NGLs, and natural gas attributable to any particular group of properties, classifications of those oil, NGLs, and natural gas reserves based on risk of recovery, and estimates of the future net cash flows from oil, NGLs, and natural gas reserves prepared by different engineers or by the same engineers but at different times may vary substantially. Accordingly, oil, NGLs, and natural gas reserve estimates may be subject to periodic downward or upward adjustments. Actual production, revenues, and expenditures with respect to our oil, NGLs, and natural gas reserves will likely vary from estimates and those variances may be material.

The information regarding discounted future net cash flows included in this report is not necessarily the current market value of the estimated oil, NGLs, and natural gas reserves attributable to our properties. The use of full cost accounting requires us to use the unweighted arithmetic average of the commodity prices existing on the first day of each of the 12 months before the end of the reporting period to calculate discounted future revenues, unless prices were otherwise determined under contractual arrangements. Actual future prices and costs may be materially higher or lower. Actual future net cash flows are also affected, in part, by the following factors:

• the amount and timing of oil, NGLs, and natural gas production;

• supply and demand for oil, NGLs, and natural gas;

• increases or decreases in consumption; and

• changes in governmental regulations or taxation.

In addition, the 10% discount factor, required by the SEC for use in calculating discounted future net cash flows for reporting purposes, is not necessarily the most appropriate discount factor based on interest rates in effect from time to time and the risks associated with our operations or the oil and natural gas industry in general.

We review quarterly the carrying value of our oil and natural gas properties under the full cost accounting rules of the SEC. Under these rules, capitalized costs of proved oil and natural gas properties may not exceed the present value of estimated future net revenues from those proved reserves, discounted at 10%. Application of this “ceiling test” generally requires pricing future revenue at the unescalated 12-month average price and requires a write-down for accounting purposes if we exceed the ceiling. We may be required to write-down the carrying value of our oil and natural gas properties when oil, NGLs, and natural gas prices are depressed. If a write-down is required, it would result in a charge to earnings but would not impact our cash flow from operating activities. Once incurred, a write-down is not reversible.

Debt and Bank Borrowing. We have incurred and currently expect to continue to incur substantial capital expenditures in our operations. Historically, we have funded our capital needs through a combination of internally generated cash flow and borrowings under our bank credit agreement. In 2011 and 2012, we issued $250.0 million (the 2011 Notes) and $400.0 million (the 2012 Notes), respectively, of senior subordinated notes (collectively, the Notes). We currently have, and will continue to

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have, a certain amount of indebtedness. At December 31, 2015, we had $281.0 million of outstanding long-term debt under our credit agreement and the amount of the Notes, net of unamortized discount, was $646.7 million.

Depending on the amount of our debt, the cash flow needed to satisfy that debt and the covenants contained in our bank credit agreement and those applicable to the Notes could:

• limit funds otherwise available for financing our capital expenditures, our drilling program or other activities or cause us to curtail these activities;

• limit our flexibility in planning for or reacting to changes in our business;

• place us at a competitive disadvantage to those of our competitors that are less indebted than we are;

• make us more vulnerable during periods of low oil, NGLs, and natural gas prices or in the event of a downturn in our business; and

• prevent us from obtaining additional financing on acceptable terms or limit amounts available under our existing or any future credit facilities.

Our ability to meet our debt obligations depends on our future performance. If the requirements of our indebtedness are not satisfied, a default could be deemed to occur and our lenders or the holders of the Notes would be entitled to accelerate the payment of the outstanding indebtedness. If that were to happen, we would not have sufficient funds available (and probably would not be able to obtain the financing required) to meet our obligations.

The amount of our existing debt, as well as our future debt, if any, is, largely, based on the costs associated with the projects we undertake at any given time and of our cash flow. Generally, our normal operating costs are those resulting from the drilling of oil and natural gas wells, the acquisition of producing properties, the costs associated with the maintenance, upgrade, or expansion of our drilling rig fleet, and the operations of our natural gas buying, selling, gathering, processing, and treating systems. To some extent, these costs, particularly the first two, are discretionary and we maintain a degree of control regarding the timing or the need to incur them. But, in some cases, unforeseen circumstances may arise, such as in the case of an unanticipated opportunity to make a large acquisition or the need to replace a costly drilling rig component due to an unexpected loss, which could force us to incur additional debt above that which we had expected or forecasted. Likewise, if our cash flow should prove to be insufficient to cover our current cash requirements we would need to increase our debt either through bank borrowings or otherwise.

RISK FACTORS

Many other factors could adversely affect our business. The following discussion describes the material risks currently known to us. However, additional risks that we do not know about or that we currently view as immaterial may also impair our business or adversely affect the value of our securities. You should carefully consider the risks described below together with the other information contained in, or incorporated by reference into, this report.

If demand for oil, NGLs, and natural gas is reduced, our ability to market as well as produce our oil, NGLs, and natural gas may be negatively affected.

Historically, oil, NGLs, and natural gas prices have been extremely volatile, with significant increases and significant price drops being experienced from time to time. In the future, various factors beyond our control will have a significant effect on oil, NGLs, and natural gas prices. Such factors include, among other things, the domestic and foreign supply of oil, NGLs, and natural gas, the price of foreign imports, the levels of consumer demand, the price and availability of alternative fuels, the availability of pipeline capacity, and changes in existing and proposed federal regulation and price controls.

The oil, NGLs, and natural gas markets are also unsettled due to a number of factors. Production from oil and natural gas wells in some geographic areas of the United States has been curtailed for considerable periods of time due to a lack of market demand and transportation and storage capacity. It is possible, however, that some of our wells may in the future be shut-in or that oil, NGLs, and natural gas will be sold on terms less favorable than might otherwise be obtained should demand for oil, NGLs, and natural gas decrease. Competition for available markets has been vigorous and there remains great uncertainty about prices that purchasers will pay. Oil, NGLs, and natural gas surpluses could result in our inability to market oil, NGLs, and natural gas profitably, causing us to curtail production and/or receive lower prices for our oil, NGls, and natural gas, situations which would adversely affect us.

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Disruptions in the financial markets could affect our ability to obtain financing or refinance existing indebtedness on reasonable terms and may have other adverse effects.

Commercial-credit and equity market disruptions may result in tight capital markets in the United States. Liquidity in the global-capital markets can be severely contracted by market disruptions making terms for certain financings less attractive, and in certain cases, result in the unavailability of certain types of financing. As a result of credit and equity market turmoil, we may not be able to obtain debt or equity financing, or refinance existing indebtedness on favorable terms, which could affect operations and financial performance.

Oil, NGLs, and natural gas prices are volatile, and low prices have negatively affected our financial results and could do so in the future.

Our revenues, operating results, cash flow, and future growth depend substantially on prevailing prices for oil, NGLs, and natural gas. Historically, oil, NGLs, and natural gas prices and markets have been volatile, and they are likely to continue to be volatile in the future. Any decline in prices in the future would have a negative impact on our future financial results as well as our ability to grow our business segments.

Prices for oil, NGLs, and natural gas are subject to wide fluctuations in response to relatively minor changes in the actual or perceived supply of and demand for oil, NGLs, and natural gas, market uncertainty, and a variety of additional factors that are beyond our control. These factors include:

• political conditions in oil producing regions;

• the ability of the members of the OPEC to agree on prices and their ability to maintain production quotas;

• actions taken by foreign oil and natural gas companies;

• the price of foreign oil imports;

• imports and exports of oil and liquefied natural gas;

• actions of governmental authorities;

• the domestic and foreign supply of oil, NGLs, and natural gas;

• the level of consumer demand;

• United States storage levels of oil, NGLs, and natural gas;

• weather conditions;

• domestic and foreign government regulations;

• the price, availability, and acceptance of alternative fuels;

• volatility in ethane prices causing rejection of ethane as part of the liquids processed stream; and

• worldwide economic conditions.

These factors and the volatile nature of the energy markets make it impossible to predict with any certainty the future prices of oil, NGLs, and natural gas.

Our contract drilling operations depend on levels of activity in the oil, NGLs, and natural gas exploration and production industry.

Our contract drilling operations depend on the level of activity in oil, NGLs, and natural gas exploration and production in our operating markets. Both short-term and long-term trends in oil, NGLs, and natural gas prices affect the level of that activity. Because oil, NGLs, and natural gas prices are volatile, the level of exploration and production activity can also be volatile. Any decrease from current oil, NGLs, and natural gas prices would further depress the level of exploration and production activity. This, in turn, would likely result in further declines in the demand for our drilling services and would have an adverse effect on our contract drilling revenues, cash flows, and profitability. As a result, the future demand for our drilling services is uncertain.

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The industries in which we operate are highly competitive, and many of our competitors have greater resources than we do.

The drilling industry in which we operate is generally very competitive. Most drilling contracts are awarded on the basis of competitive bids, which may result in intense price competition. Some of our competitors in the contract drilling industry have greater financial and human resources than we do. These resources may enable them to better withstand periods of low drilling rig utilization, to compete more effectively on the basis of price and technology, to build new drilling rigs or acquire existing drilling rigs, and to provide drilling rigs more quickly than we do in periods of high drilling rig utilization.

The oil and natural gas industry is also highly competitive. We compete in the areas of property acquisitions and oil and natural gas exploration, development, production, and marketing with major oil companies, other independent oil and natural gas concerns, and individual producers and operators. In addition, we must compete with major and independent oil and natural gas concerns in recruiting and retaining qualified employees. Many of our competitors in the oil and natural gas industry have substantially greater resources than we do.

The midstream industry is also highly competitive. We compete in areas of gathering, processing, transporting, and treating natural gas with other midstream companies. We are continually competing with larger midstream companies for acquisitions and construction projects. Many of our competitors have greater financial resources, human resources, and larger geographic presence than we do currently.

Growth through acquisitions is not assured.

In the past, we have experienced growth in each of our segments, in part, through mergers and acquisitions. The contract land drilling industry, the exploration and development industry, as well as the gas gathering and processing industry, have experienced significant consolidation over the past several years, and there can be no assurance that acquisition opportunities will be available. Even if available, there is no assurance that we would have the financial ability to pursue the opportunity. Additionally, we are likely to continue to face intense competition from other companies for available acquisition opportunities.

There can be no assurance that we will:

• be able to identify suitable acquisition opportunities;

• have sufficient capital resources to complete additional acquisitions;

• successfully integrate acquired operations and assets;

• effectively manage the growth and increased size;

• maintain the crews and market share to operate any future drilling rigs we may acquire; or

• successfully improve our financial condition, results of operations, business or prospects in any material manner as a result of any completed acquisition.

We may incur substantial indebtedness to finance future acquisitions and also may issue debt instruments, equity securities, or convertible securities in connection with any acquisitions. Debt service requirements could represent a significant burden on our results of operations and financial condition and the issuance of additional equity would be dilutive to existing shareholders. Also, continued growth could strain our management, operations, employees, and other resources.

Successful acquisitions, particularly those of oil and natural gas companies or of oil and natural gas properties, require an assessment of a number of factors, many of which are beyond our control. These factors include recoverable reserves, exploration potential, future oil, NGLs, and natural gas prices, operating costs, and potential environmental and other liabilities. Such assessments are inexact and their accuracy is inherently uncertain.

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Our operations have significant capital requirements, and our indebtedness could have important consequences.

We have experienced and may continue to experience substantial capital needs for our operations. We have $646.7 million of indebtedness outstanding (net of unamortized discount) under the senior subordinated notes we have issued to date and in addition, have the right to borrow up to $500.0 million under our credit agreement. As of February 12, 2016, we had

$262.9 million outstanding borrowings under our credit agreement. Our level of indebtedness, the cash flow needed to satisfy our indebtedness, and the covenants governing our indebtedness could:

• limit funds available for financing capital expenditures, our drilling program or other activities or cause us to curtail these activities;

• limit our flexibility in planning for, or reacting to changes in, our business;

• place us at a competitive disadvantage to some of our competitors that are less leveraged than we are;

• make us more vulnerable during periods of low oil, NGLs, and natural gas prices or in the event of a downturn in our business; and

• prevent us from obtaining additional financing on acceptable terms or limit amounts available under our existing or any future credit facilities.

Our ability to meet our debt service and other contractual and contingent obligations will depend on our future performance. In addition, lower oil, NGLs, and natural gas prices could result in future reductions in the amount available for borrowing under our credit agreement, reducing our liquidity, and even triggering mandatory loan repayments.

The instruments governing our indebtedness contain various covenants limiting the conduct of our business.

The indentures governing our senior subordinated notes and our credit agreement contain various restrictive covenants that limit the conduct of our business. In particular, these agreements will place certain limits on our ability to, among other things:

• incur additional indebtedness, guarantee obligations or issue disqualified capital stock;

• pay dividends or distributions on our capital stock or redeem, repurchase or retire our capital stock;

• make investments or other restricted payments;

• grant liens on assets;

• enter into transactions with stockholders or affiliates;

• sell assets;

• issue or sell capital stock of certain subsidiaries; and

• merge or consolidate.

In addition, our credit agreement also requires us to maintain a minimum current ratio and a maximum leverage ratio.

If we fail to comply with the restrictions in the indentures governing our senior subordinated notes, our credit agreement or any other subsequent financing agreements, a default may allow the creditors, if the agreements so provide, to accelerate the related indebtedness as well as any other indebtedness to which a cross-acceleration or cross-default provision applies. If that occurs, we may not be able to make all of the required payments or borrow sufficient funds to refinance that debt. Even if new financing were available at that time, it may not be on terms acceptable to us. In addition, lenders may be able to terminate any commitments they had made to make available further funds.

Our future performance depends on our ability to find or acquire additional oil, NGLs, and natural gas reserves that are economically recoverable.

In general, production from oil and natural gas properties declines as reserves are depleted, with the rate of decline depending on reservoir characteristics. Unless we successfully replace the reserves that we produce, our reserves will decline, resulting eventually in a decrease in oil, NGLs, and natural gas production and lower revenues and cash flow from operations. Historically, we have succeeded in increasing reserves after taking production into account through exploration and

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development. We have conducted these activities on our existing oil and natural gas properties as well as on newly acquired properties. We may not be able to continue to replace reserves from these activities at acceptable costs. Lower prices of oil, NGLs, and natural gas may further limit the kinds of reserves that can economically be developed. Lower prices also decrease our cash flow and may cause us to decrease capital expenditures.

We are continually identifying and evaluating opportunities to acquire oil and natural gas properties, including acquisitions that would be significantly larger than those consummated to date by us. We cannot assure you that we will successfully consummate any acquisition, that we will be able to acquire producing oil and natural gas properties that contain economically recoverable reserves or that any acquisition will be profitably integrated into our operations.

The competition for producing oil and natural gas properties is intense. This competition could mean that to acquire properties we will have to pay higher prices and accept greater ownership risks than we have in the past.

Our exploration and production and mid-stream operations involve a high degree of business and financial risk which could adversely affect us.

Exploration and development involve numerous risks that may result in dry holes, the failure to produce oil, NGLs, and natural gas in commercial quantities and the inability to fully produce discovered reserves. The cost of drilling, completing, and operating wells is substantial and uncertain. Numerous factors beyond our control may cause the curtailment, delay, or cancellation of drilling operations, including:

• unexpected drilling conditions;

• pressure or irregularities in formations;

• capacity of pipeline systems;

• equipment failures or accidents;

• adverse weather conditions;

• compliance with governmental requirements; and

• shortages or delays in the availability of drilling rigs or delivery crews and the delivery of equipment.

Exploratory drilling is a speculative activity. Although we may disclose our overall drilling success rate, those rates may decline. Although we may discuss drilling prospects that we have identified or budgeted for, we may ultimately not lease or drill these prospects within the expected time frame, or at all. Lack of drilling success will have an adverse effect on our future results of operations and financial condition.

Our mid-stream operations involve numerous risks, both financial and operational. The cost of developing gathering systems and processing plants is substantial and our ability to recoup these costs is uncertain. Our operations may be curtailed, delayed, or canceled as a result of many things beyond our control, including:

• unexpected changes in the deliverability of natural gas reserves from the wells connected to the gathering systems;

• availability of competing pipelines in the area;

• capacity of pipeline systems;

• equipment failures or accidents;

• adverse weather conditions;

• compliance with governmental requirements;

• delays in the development of other producing properties within the gathering system’s area of operation; and

• demand for natural gas and its constituents.

Many of the wells from which we gather and process natural gas are operated by other parties. As a result, we have little control over the operations of those wells which can act to increase our risk. Operators of those wells may act in ways that are not in our best interests.

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Competition for experienced technical personnel may negatively impact our operations or financial results.

Our continued oil and natural gas segment and mid-stream segment success and the success of other activities integral to our operations will depend, in part, on our ability to attract and retain experienced geologists, engineers, and other professionals. Competition for these professionals can be extremely intense, particularly when the industry is experiencing favorable conditions.

Our derivative arrangements might limit the benefit of increases in oil, NGLs, and natural gas prices.

In order to reduce our exposure to short-term fluctuations in the price of oil, NGLs, and natural gas, we sometimes enter into derivative contracts. These derivative contracts apply to only a portion of our production and provide only partial price protection against declines in oil, NGLs, and natural gas prices. These derivative contracts may expose us to risk of financial loss and limit the benefit to us of increases in prices.

Estimates of our reserves are uncertain and may prove to be inaccurate.

There are numerous uncertainties inherent in estimating quantities of proved reserves and their values, including many factors beyond our control. The reserve data represents only estimates. Reservoir engineering is a subjective and inexact process of estimating underground accumulations of oil and natural gas that cannot be measured in an exact manner. Estimates of economically recoverable oil, NGLs, and natural gas reserves depend on a number of variable factors, including historical production from the area compared with production from other producing areas, and assumptions concerning:

• the effects of regulations by governmental agencies;

• future oil, NGLs, and natural gas prices;

• future operating costs;

• severance and excise taxes;

• development costs; and

• workover and remedial costs.

Some or all of these assumptions may vary considerably from actual results. For these reasons, estimates of the economically recoverable quantities of oil, NGLs, and natural gas attributable to any particular group of properties, classifications of those reserves based on risk of recovery, and estimates of the future net cash flows from reserves prepared by different engineers or by the same engineers but at different times may vary substantially. Accordingly, reserve estimates may

be subject to downward or upward adjustment. Actual production, revenues and expenditures with respect to our reserves will likely vary from estimates, and those variances may be material.

The information regarding discounted future net cash flows should not be considered as the current market value of the estimated oil, NGLs, and natural gas reserves attributable to our properties. As required by the SEC, the estimated discounted future net cash flows from proved reserves are based on prices on the first day of the month for each month within the 12-month period before the end of the reporting period 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 the following factors:

• the amount and timing of actual production;

• supply and demand for oil, NGLs, and natural gas;

• increases or decreases in consumption; and

• changes in governmental regulations or taxation.

In addition, the 10% per year discount factor, which is required by the SEC to be used in calculating discounted future net cash flows for reporting purposes, is not necessarily the most appropriate discount factor based on interest rates in effect from time to time and risks associated with our operations or the oil and natural gas industry in general.

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If oil, NGLs, and natural gas prices decrease or are unusually volatile, we may be required to take write-downs of our oil and natural gas properties, the carrying value of our drilling rigs or our natural gas gathering and processing systems.

We review quarterly the carrying value of our oil and natural gas properties under the full cost accounting rules of the SEC. Under these rules, capitalized costs of proved oil and natural gas properties may not exceed the present value of estimated future net revenues from proved reserves, discounted at 10% per year. Application of the ceiling test generally requires pricing future revenue at the unweighted arithmetic average of the price on the first day of month for each month within the 12-month period prior to the end of the reporting period, unless prices were defined by contractual arrangements, and requires a write-down for accounting purposes if the ceiling is exceeded. We may be required to write-down the carrying value of our oil and natural gas properties when oil, NGLs, and natural gas prices are depressed. If a write-down is required, it would result in a charge to earnings, but would not impact cash flow from operating activities. Once incurred, a write-down of oil and natural gas properties is not reversible at a later date. Because our ceiling tests use a rolling 12-month look back average price it is possible that a write down during a reporting period will not remove the need for us to take additional write downs in one or more succeeding periods. This would be the case when months with higher commodity prices roll off the 12-month period and are replaced with more recent months having lower commodity prices.

Our drilling equipment, transportation equipment, gas gathering and processing systems, and other property and equipment are carried at cost. We are required to periodically test to see if these values, including associated goodwill and other intangible assets, have been impaired whenever events or changes in circumstances suggest the carrying amount may not be recoverable. If any of these assets are determined to be impaired, the loss is measured as the amount by which the carrying amount of the asset exceeds its fair value. An estimate of fair value is based on the best information available, including prices for similar assets. Changes in these estimates could cause us to reduce the carrying value of property, equipment, and related intangible assets. Once these values have been reduced, they are not reversible.

Our operations present inherent risks of loss that, if not insured or indemnified against, could adversely affect our results of operations.

Our contract drilling operations are subject to many hazards inherent in the drilling industry, including blowouts, cratering, explosions, fires, loss of well control, loss of hole, damaged or lost drilling equipment, and damage or loss from inclement weather. Our exploration and production and mid-stream operations are subject to these and similar risks. Any of these events could result in personal injury or death, damage to or destruction of equipment and facilities, suspension of operations, environmental damage, and damage to the property of others. Generally, drilling contracts provide for the division of responsibilities between a drilling company and its customer, and we seek to obtain indemnification from our drilling customers by contract for some of these risks. To the extent that we are unable to transfer these risks to drilling customers by contract or indemnification agreements (or to the extent we assume obligations of indemnity or assume liability for certain risks under our drilling contracts), we seek protection from some of these risks through insurance. However, some risks are not covered by insurance and we cannot assure you that the insurance we do have or the indemnification agreements we have entered into will adequately protect us against liability from all of the consequences of the hazards described above. The occurrence of an event not fully insured or indemnified against, or the failure of a customer to meet its indemnification obligations, could result in substantial losses. In addition, we cannot assure you that insurance will be available to cover any or all of these risks. Even if available, the insurance might not be adequate to cover all of our losses, or we might decide against obtaining that insurance because of high premiums or other costs.

In addition, we are not the operator of many of our wells. As a result, our operating risks for those wells and our ability to influence the operations for those wells are less subject to our control. Operators of those wells may act in ways that are not in our best interests.

Governmental and environmental regulations could adversely affect our business.

Our business is subject to federal, state, and local laws and regulations on taxation, the exploration for and development, production, and marketing of oil and natural gas, and safety matters. Many laws and regulations require drilling permits and govern the spacing of wells, rates of production, prevention of waste, unitization and pooling of properties, and other matters. These laws and regulations have increased the costs of planning, designing, drilling, installing, operating, and abandoning our oil and natural gas wells and other facilities. In addition, these laws and regulations, and any others that are passed by the jurisdictions where we have production, could limit the total number of wells drilled or the allowable production from successful wells, which could limit our revenues.

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We are (or could become) subject to complex environmental laws and regulations adopted by the various jurisdictions where we own or operate. We could incur liability to governments or third parties for discharges of oil, natural gas or other pollutants into the air, soil or water, including responsibility for remedial costs. We could potentially discharge these materials into the environment in any number of ways including the following:

• from a well or drilling equipment at a drill site;

• from gathering systems, pipelines, transportation facilities, and storage tanks;

• damage to oil and natural gas wells resulting from accidents during normal operations; and

• blowouts, cratering, and explosions.

Because the requirements imposed by laws and regulations are frequently changed, we cannot assure you that laws and regulations enacted in the future, including changes to existing laws and regulations, will not adversely affect our business. The current Congress and White House administration may impose or change laws and regulations that will adversely affect our business. With the trend toward stricter standards, greater regulation, and more extensive permit requirements, our risks related to environmental matters and our environmental expenditures could increase in the future. In addition, because we acquire interests in properties that have been operated in the past by others, we may be liable for environmental damage caused by the former operators, which liability could be material.

Any future implementation of price controls on oil, NGLs, and natural gas would affect our operations.

Certain groups have asserted efforts to have the United States Congress impose some form of price controls on either oil, natural gas, or both. There is no way at this time to know what result these efforts will have nor, if implemented, their effect on our operations. However, it is possible that these efforts, if successful, would serve to limit the amount that we might be able to get for our future oil, NGLs, and natural gas production. Any future limits on the price of oil, NGLs, and natural gas could also result in adversely affecting the demand for our drilling services.

Provisions of Delaware law and our by-laws and charter could discourage change in control transactions and prevent shareholders from receiving a premium on their investment.

Our by-laws and charter provide for a classified board of directors with staggered terms and authorizes the board of directors to set the terms of preferred stock. In addition, our charter and Delaware law contain provisions that impose restrictions on business combinations with interested parties. Because of the provisions of our by-laws, charter, and Delaware law, persons considering unsolicited tender offers or other unilateral takeover proposals may be more likely to negotiate with our board of directors rather than pursue non-negotiated takeover attempts. As a result, these provisions may make it more difficult for our shareholders to benefit from transactions that are opposed by an incumbent board of directors.

New technologies may cause our current exploration and drilling methods to become obsolete, resulting in an adverse effect on our production.

Our industry is subject to rapid and significant advancements in technology, including the introduction of new products and services using new technologies. As competitors use or develop new technologies, we may be placed at a competitive disadvantage, and competitive pressures may force us to implement new technologies at a substantial cost. In addition, competitors may have greater financial, technical, and personnel resources that allow them to enjoy technological advantages and may in the future allow them to implement new technologies before we can. We cannot be certain that we will be able to implement technologies on a timely basis or at a cost that is acceptable to us. One or more of the technologies that we currently use or that we may implement in the future may become obsolete or may not work as we expected and we may be adversely affected.

We may be affected by climate change and market or regulatory responses to climate change.

Climate change, including the impact of potential global warming regulations, could have a material adverse effect on our results of operations, financial condition, and liquidity. Restrictions, caps, taxes, or other controls on emissions of greenhouse gasses, including diesel exhaust, could significantly increase our operating costs. Restrictions on emissions could also affect our customers that (a) use commodities that we carry to produce energy, (b) use significant amounts of energy in producing or delivering the commodities we carry, or (c) manufacture or produce goods that consume significant amounts of energy or burn fossil fuels, including chemical producers, farmers and food producers, and automakers and other manufacturers. Significant

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cost increases, government regulation, or changes of consumer preferences for goods or services relating to alternative sources of energy or emissions reductions could materially affect the markets for the commodities associated with our business, which in turn could have a material adverse effect on our results of operations, financial condition, and liquidity. Government incentives encouraging the use of alternative sources of energy could also affect certain of our customers and the markets for certain of the commodities associated with our business in an unpredictable manner that could alter our business activities. Finally, we could face increased costs related to defending and resolving legal claims and other litigation related to climate change and the alleged impact of our operations on climate change. Any of these factors, individually or in operation with one or more of the other factors, or other unforeseen impacts of climate change could reduce the amount of business activity we conduct and have a material adverse effect on our results of operations, financial condition, and liquidity.

The results of our operations depend on our ability to transport oil, NGLs, and gas production to key markets.

The marketability of our oil, NGLs, and natural gas production depends in part on the availability, proximity, and capacity of pipeline systems, refineries, and other transportation sources. The unavailability of or lack of available capacity on these systems and facilities could result in the shut-in of producing wells or the delay or discontinuance of development plans for properties. Federal and state regulation of oil, NGLs, and natural gas production and transportation, tax and energy policies, changes in supply and demand, pipeline pressures, damage to or destruction of pipelines, and general economic conditions could adversely affect our ability to produce, gather and, transport oil, NGLs, and natural gas.

The loss of one or a number of our larger customers could have a material adverse effect on our financial condition and results of operations.

During 2015, sales to Sunoco Logistics and Valero Energy Corporation accounted for 19% and 15% of our oil and natural gas revenues, respectively. QEP Resources, Inc. was our largest drilling customer accounting for approximately 25% of our total contract drilling revenues. And for our mid-stream segment, ONEOK Partners, L.P., Tenaska Resources, LLC, and Laclede Group, Inc. accounted for approximately 29%, 18%, and 12%, respectively, of our revenues. No other third party customer accounted for 10% or more of our revenues. Any of our customers may choose not to use our services and the loss of a number of our larger customers could have a material adverse effect on our financial condition and results of operations if we could not find replacements.

Our mid-stream segment depends on certain natural gas producers and pipeline operators for a significant portion of its supply of natural gas and NGLs. The loss of any of these producers could result in a decline in our volumes and revenues.

We rely on certain natural gas producers for a significant portion of our natural gas and NGLs supply. While some of these producers are subject to long-term contracts, we may be unable to negotiate extensions or replacements of these contracts

on favorable terms, if at all. The loss of all or even a portion of the natural gas volumes supplied by these producers, as a result of competition or otherwise, could have a material adverse effect on our mid-stream segment unless we were able to acquire comparable volumes from other sources.

The counterparties to our commodity derivative contracts may not be able to perform their obligations to us, which could materially affect our cash flows and results of operations.

To reduce our exposure to adverse fluctuations in the prices of oil and natural gas, we currently, and may in the future, enter into commodity derivative contracts for a significant portion of our forecasted oil, NGLs, and natural gas production. The extent of our commodity price exposure is related largely to the effectiveness and scope of our derivative activities, as well as to the ability of counterparties under our commodity derivative contracts to satisfy their obligations to us. If one or more of our counterparties is unable or unwilling to make required payments to us under our commodity derivative contracts, it could have a material adverse effect on our financial condition and results of operations.

Reliance on management.

We depend greatly on the efforts of our executive officers and other key employees to manage our operations. The loss or unavailability of any of our executive officers or other key employees could have a material adverse effect on our business.

We are subject to various claims and litigation that could ultimately be resolved against us requiring material future cash payments and/or future material charges against our operating income and materially impairing our financial position.

The nature of our business makes us highly susceptible to claims and litigation. We are subject to various existing legal

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claims and lawsuits, which could have a material adverse effect on our consolidated financial position, results of operations, or cash flows. Any claims or litigation, even if fully indemnified or insured, could negatively affect our reputation among our customers and the public, and make it more difficult for us to compete effectively or obtain adequate insurance in the future.

Derivative regulations included in current financial reform legislation could impede our ability to manage business and financial risks by restricting our use of derivative instruments as hedges against fluctuating commodity prices and interest rates.

In July 2010, the Dodd-Frank Wall Street Reform and Consumer Protection Act (the Act) was passed by Congress and signed into law. The Act contains significant derivative regulations, including a requirement that certain transactions be cleared on exchanges and a requirement to post cash collateral (commonly referred to as margin) for such transactions. The Act provides for a potential exception from these clearing and cash collateral requirements for commercial end-users and it includes a number of defined terms that will be used in determining how this exception applies to particular derivative transactions and the parties to those transactions. 

We use crude oil and natural gas derivative instruments with respect to a portion of our expected production in order to reduce commodity price uncertainty and enhance the predictability of cash flows relating to the marketing of our crude oil and natural gas. As commodity prices increase, our derivative liability positions increase; however, none of our current derivative contracts require the posting of margin or similar cash collateral when there are changes in the underlying commodity prices that are referred to in these contracts.

Depending on the rules and definitions adopted by the CFTC, we could be required to post collateral with our dealer counterparties for our commodities derivative transactions. Such a requirement could have a significant impact on our business by reducing our ability to execute derivative transactions to reduce commodity price uncertainty and to protect cash flows. Requirements to post collateral would cause significant liquidity issues by reducing our ability to use cash for investment or other corporate purposes, or would require us to increase our level of debt. In addition, a requirement for our counterparties to post collateral would likely result in additional costs being passed on to us, thereby decreasing the effectiveness of our derivative contracts and our profitability.

Proposed federal and state legislative and regulatory initiatives relating to hydraulic fracturing could result in increased costs and additional operating restrictions or delays.

Hydraulic-fracturing is an essential and common practice in the oil and gas industry used to stimulate production of oil, natural gas, and associated liquids from dense subsurface rock formations. Our oil and natural gas segment routinely apply hydraulic-fracturing techniques to many of our oil and natural gas properties, including our unconventional resource plays in the Granite Wash of Texas and Oklahoma, the Marmaton and Hoxbar of Oklahoma, the Wilcox of Texas, and the Mississippian of Kansas. Hydraulic-fracturing involves using water, sand, and certain chemicals to fracture the hydrocarbon-bearing rock formation to allow the flow of hydrocarbons into the wellbore. The process is typically regulated by state oil and natural gas commissions; however, the EPA has asserted federal regulatory authority over certain hydraulic-fracturing activities involving diesel under the Safe Drinking Water Act and published permitting guidance addressing the performance of such activities using diesel. The EPA is also seeking to require companies to disclose information regarding the chemicals used in hydraulic fracturing and the bureau of Land Management has imposed requirements for hydraulic fracturing activities of federal lands. In addition, Congress has from time to time considered legislation 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 we operate, including Texas, Oklahoma, Kansas, Colorado, and Wyoming, have adopted, and other states are considering adopting, regulations that could impose more stringent permitting, public disclosure of fracking fluids, waste disposal, and well construction requirements on hydraulic-fracturing operations or otherwise seek to ban fracturing activities altogether. For example, Texas adopted a law in June 2011 requiring disclosure to the Railroad Commission of Texas (RCT) and the public of certain information regarding the components used in the hydraulic-fracturing process. In addition to state laws, local land use restrictions, such as city ordinances, may restrict or prohibit the performance of well drilling in general and/or hydraulic fracturing in particular. In the event state, local, or municipal legal restrictions are adopted in areas where we are currently conducting, or in the future plan to conduct operations, we 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 even be precluded from the drilling and/or completion of wells.

There are certain governmental reviews either underway or being proposed that focus on environmental aspects of hydraulic-fracturing practices. The White House Council on Environmental Quality is coordinating a review of hydraulic-

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fracturing practices, and a committee of the United States House of Representatives has conducted an investigation of hydraulic-fracturing practices. Furthermore, a number of federal agencies are analyzing, or have been requested to review, a variety of environmental issues associated with hydraulic fracturing. The EPA is currently evaluating the potential environmental effects of hydraulic fracturing on drinking water and groundwater. In addition, the U.S. Department of Energy has conducted an investigation into practices the agency could recommend to better protect the environment from drilling using hydraulic-fracturing completion methods.

Additionally, certain members of the Congress have previously called upon the U.S. Government Accountability Office to investigate how hydraulic fracturing might adversely affect water resources, the U.S. Securities and Exchange Commission to investigate the natural gas industry and any possible misleading of investors or the public regarding the economic feasibility of pursuing natural gas deposits in shales by means of hydraulic fracturing, and the U.S. Energy Information Administration to provide a better understanding of that agency’s estimates regarding natural gas reserves, including reserves from shale formations, as well as uncertainties associated with those estimates. These ongoing or proposed studies, depending on their course and results obtained, could spur initiatives to further regulate hydraulic fracturing under the Safe Drinking Water Act or other regulatory processes.

Increased regulation and attention given to the hydraulic fracturing process could lead to greater opposition, including litigation, to oil and gas production activities using hydraulic fracturing techniques. Additional legislation or regulation could also lead to operational delays or increased operating costs in the production of oil, natural gas, and associated liquids including from the development of shale plays, or could make it more difficult to perform hydraulic fracturing. The adoption of additional federal, state or local laws or the implementation of regulations regarding hydraulic fracturing could potentially cause a decrease in the completion of new oil and gas wells, increased compliance costs and time, which could adversely affect our financial position, results of operations, and cash flows.

Our ability to produce crude oil, natural gas, and associated liquids economically and in commercial quantities could be impaired if we are unable to acquire adequate supplies of water for our drilling operations and/or completions or are unable to dispose of or recycle the water we use at a reasonable cost and in accordance with applicable environmental rules.

To our knowledge, there have been no citations, suits, or contamination of potable drinking water arising from our fracturing operations. We do not have insurance policies in effect that are intended to provide coverage for losses solely related to hydraulic fracturing operations; however, it is possible that our general liability and excess liability insurance policies might cover third-party claims related to hydraulic fracturing operations and associated legal expenses depending on the specific nature of the claims, the timing of the claims, as well as the specific terms of such policies.

Uncertainty regarding increased seismic activity in Oklahoma and Kansas.

We conduct oil and natural gas exploration, development and drilling activities in Oklahoma, Kansas, and elsewhere. In recent years, Oklahoma and Kansas has experienced a significant increase in earthquakes and other seismic activity. Some parties believe that there is a correlation between certain oil and gas activities and the increased occurrence of earthquakes. The extent of this correlation, if any, is the subject of studies by both state and federal agencies the results of which remain uncertain. We cannot state at this time what if any impact this seismic activity may have on us or our industry in the future.

The hydraulic fracturing process on which we depend to produce commercial quantities of crude oil, natural gas, and associated NGLs from many reservoirs requires the use and disposal of significant quantities of water.

Our inability to secure sufficient amounts of water, or to dispose of or recycle the water used in our oil and natural gas segment operations, could adversely impact our operations. Moreover, the imposition of new environmental initiatives and regulations could include restrictions on our ability to conduct certain operations such as hydraulic fracturing or disposal of wastes, including, but not limited to, produced water, drilling fluids, and other wastes associated with the exploration, development or production of oil and natural gas.

Compliance with environmental regulations and permit requirements governing the withdrawal, storage and, use of surface water or groundwater necessary for hydraulic fracturing of wells may increase our operating costs and cause delays, interruptions, or termination of our operations, the extent of which cannot be predicted, all of which could have an adverse effect on our operations and financial condition.

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We may decide not to drill some of the prospects we have identified, and locations that we do drill may not yield oil, NGLs, and natural gas in commercially viable quantities.

Our oil and natural gas segment's prospective drilling locations are in various stages of evaluation, ranging from a prospect that is ready to drill to a prospect that will require additional geological and engineering analysis. Based on a variety of factors, including future oil, NGLs, natural gas prices, the generation of additional seismic or geological information, and other factors, we may decide not to drill one or more of these prospects. As a result, we may not be able to increase or maintain our reserves or production, which in turn could have an adverse effect on our business, financial position, and results of operations. In addition, the SEC's reserve reporting rules include a general requirement that, subject to limited exceptions, proved undeveloped reserves may only be booked if they relate to wells scheduled to be drilled within five years of the date of booking. At December 31, 2015, we had 65 proved undeveloped drilling locations. To the extent that we do not drill these locations within five years of initial booking, they may not continue to qualify for classification as proved reserves, and we may be required to reclassify such reserves as unproved reserves. The reclassification of those reserves could also have a negative effect on the borrowing base under our credit facility.

The cost of drilling, completing, and operating a well is often uncertain, and cost factors can adversely affect the economics of a well. Our efforts will be uneconomic if we drill dry holes or wells that are productive but do not produce enough oil, NGLs, and natural gas to be commercially viable after drilling, operating, and other costs.

The borrowing base under our credit agreement is determined semi-annually at the discretion of the lenders and is based in a large part on the prices for oil, NGLs, and natural gas.

Significant declines in oil, NGLs, and natural gas prices may result in a decrease in our borrowing base. The lenders can unilaterally adjust the borrowing base and therefore the borrowings permitted to be outstanding under our credit agreement. If outstanding borrowings are in excess of the borrowing base, we must (a) repay the loan in excess of the borrowing base, (b) dedicate additional properties to the borrowing base, or (c) begin monthly principal payments in accordance with our credit agreement. At the latest redetermination in October 2015, the lenders reduced our borrowing base from $725.0 million to $550.0 million primarily due to lower commodity prices. Continued lower commodity prices and reductions in our oil and gas drilling program could lead to further reduction in our borrowing base amount.

Potential listing of species as “endangered” under the federal Endangered Species Act could result in increased costs and new operating restrictions or delays on our operations and that of our customers, which could adversely affect our operations and financial results.

The federal Endangered Species Act, referred to as the ESA, and analogous state laws regulate a variety of activities, including oil and gas development, which could have an adverse effect on species listed as threatened or endangered under the ESA or their habitats. The designation of previously unidentified endangered or threatened species could cause oil and natural gas exploration and production operators and service companies to incur additional costs or become subject to operating delays, restrictions or bans in affected areas, which impacts could adversely reduce the amount of drilling activities in affected areas. All three of our business segments could be subject to the effect of one or more species being listed as threatened or endangered within the areas of our operations. Numerous species have been listed or proposed for protected status in areas in which we provide or could in the future undertake operations. The U.S. Fish and Wildlife Service and the National Marine Fisheries in 2016 issued final revised definitions relating to impacts on critical habitats for potentially endangered species allowing exclusion of certain ares so long as they will not result in the extinction of the species. The presence of protected species in areas where we provide contract drilling or mid-stream services or conduct exploration and production operations could impair our ability to timely complete or carry out those services and, consequently, adversely affect our results of operations and financial position.

The construction of our new proprietary BOSS drilling rigs is subject to risks, including delays and cost overruns, and may not meet our expectations.

We have designed and built several new proprietary 1,500 horsepower AC electric drilling rigs, which we refer to as BOSS drilling rigs. This new design is intended to position us to more effectively meet the demands of our customers. The construction of any future new BOSS drilling rigs is subject to the risks of delays or cost overruns inherent in any large construction project as a result of numerous possible factors, including the following:

• shortages of equipment, materials or skilled labor;

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• work stoppages and labor disputes;

• unscheduled delays in the delivery of ordered materials and equipment;

• unanticipated increases in the cost of equipment, labor and raw materials used in construction of our drilling rigs, particularly steel;

• weather interferences;

• difficulties in obtaining necessary permits or in meeting permit conditions;

• unforeseen design and engineering problems;

• failure or delay in obtaining acceptance of the drilling rig from our customer;

• failure or delay of third party equipment vendors or service providers; and

• lack of demand from the downturn in the oil and gas industry.

As to our new BOSS drilling rigs, there can be no assurance that we will:

• obtain additional new-build contract opportunities; or

• successfully improve our financial condition, results of operations or prospects as a result of the new drilling rigs.

Cyber attacks targeting systems and infrastructure used by the oil and gas industry may adversely impact our operations.

Our business has become increasingly dependent on digital technologies to conduct certain exploration, development and production activities. We depend on digital technology to estimate quantities of natural gas, oil and NGL reserves, process and record financial and operating data, analyze seismic and drilling information, and communicate with our employees and third-party partners. Although we utilize various procedures and controls to mitigate our exposure to such risk, cyber attacks are evolving and unpredictable. These attacks could include, but are not limited to, malicious software, attempts to gain unauthorized access to data, other electronic security breaches that could lead to disruptions in critical systems, the unauthorized release of protected information and the corruption or loss of data. The occurrence of such an attack could lead to financial losses and have a negative impact on our results of operations. We are not aware that any such breaches have occurred to date.

Item 1B. Unresolved Staff Comments

None.

Item 2.     Properties

The information called for by this item was consolidated with and disclosed in connection with Item 1 above.

Item 3.     Legal Proceedings

Panola Independent School District No. 4, et al. v. Unit Petroleum Company, No. CJ-07-215, District Court of Latimer County, Oklahoma.

Panola Independent School District No. 4, Michael Kilpatrick, Gwen Grego, Carla Lessel, Thelma Christine Pate, Juanita Golightly, Melody Culberson, and Charlotte Abernathy are the Plaintiffs in this case and are royalty owners in oil and gas drilling and spacing units for which the company’s exploration segment distributes royalty. The Plaintiffs’ central allegation is that the company’s exploration segment has underpaid royalty obligations by deducting post-production costs or marketing related fees. Plaintiffs sought to pursue the case as a class action on behalf of persons who receive royalty from us for our Oklahoma production. We have asserted several defenses including that the deductions are permitted under Oklahoma law. We have also asserted that the case should not be tried as a class action due to the materially different circumstances that determine what, if any, deductions are taken for each lease. On December 16, 2009, the trial court entered its order certifying the class. On May 11, 2012 the court of civil appeals reversed the trial court’s order certifying the class. The Plaintiffs petitioned the supreme court for certiorari and on October 8, 2012, the Plaintiff’s petition was denied. On January 22, 2013, the Plaintiffs filed a second request to certify a class of royalty owners that was slightly smaller than their first attempt. Since then, the Plaintiffs have further amended their proposed class to just include royalty owners entitled to royalties under certain leases located in Latimer, Le Flore, and Pittsburg Counties, Oklahoma. In July 2014, a second class certification hearing was held where, in addition to

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the defenses described above, we argued that the amended class definition is still deficient under the court of civil appeals opinion reversing the initial class certification. Closing arguments were held on December 2, 2014. There is no timetable for when the court will issue its ruling. The merits of Plaintiffs’ claims will remain stayed while class certification issues are pending.

Item 4.     Mine Safety Disclosures

Not applicable.

PART II

Item 5.     Market for the Registrant’s Common Equity, Related Stockholder Matters, and Issuer Purchases of Equity Securities

Our common stock trades on the New York Stock Exchange under the symbol “UNT.” The following table identifies the high and low sales prices per share of our common stock for the periods indicated:

	2015				2014
Quarter	High		Low		High		Low
First	$	34.66	$	24.76	$	65.63	$	48.47
Second	$	36.23	$	26.79	$	68.88	$	61.40
Third	$	27.10	$	11.00	$	70.36	$	57.85
Fourth	$	19.53	$	10.60	$	59.68	$	28.24

On February 12, 2016, the closing sale price of our common stock, as reported by the NYSE, was $6.99 per share. On that date, there were approximately 866 holders of record of our common stock.

We have never declared any cash dividends on our common stock. Any future determination by our board of directors to pay dividends on our common stock will be made only after considering our financial condition, results of operations, capital requirements, and other relevant factors. Additionally, our bank credit agreement and the Notes prohibit the payment of cash dividends on our common stock under certain circumstances. For further information regarding our bank credit agreement and the Notes agreement’s impact on our ability to pay dividends see “Our Credit Agreement and Senior Subordinated Notes” under Item 7 of this report.

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Performance Graph. The following graph and related information shall not be deemed “soliciting material” or be deemed to be “filed” with the SEC, nor shall such information be incorporated by reference into any future filing, except to the extent that we specifically incorporate it by reference into such filing.

Set forth below is a line graph comparing our cumulative total shareholder return on our common stock with the cumulative total return of the S&P 500 Stock Index, S&P 600 Oil and Gas Exploration & Production and our peer group which includes Helmerich & Payne, Inc., Patterson – UTI Energy Inc., and Pioneer Energy Services Corp. The graph below assumes an investment of $100 at the beginning of the period. The shareholder return set forth below is not necessarily indicative of future performance.

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Item 6.     Selected Financial Data

The following table shows selected consolidated financial data. The data should be read in conjunction with Item 7 “Management’s Discussion and Analysis of Financial Condition and Results of Operations,” for a review of 2015, 2014, and 2013 activity.

	As of and for the Year Ended December 31,
	2015				2014			2013		2012			2011
	(In thousands except per share amounts)
Revenues(1)	$	854,231			$	1,572,944		$	1,351,850	$	1,315,123		$	1,207,503
Net income (loss)	$	(1,037,361	)	(4)	$	136,276	(3)	$	184,746	$	23,176	(2)	$	195,867
Net income (loss) per common share:
Basic	$	(21.12	)		$	2.80		$	3.83	$	0.48		$	4.11
Diluted	$	(21.12	)		$	2.78		$	3.80	$	0.48		$	4.08
Total assets	$	2,808,509		(4)	$	4,473,728	(3)	$	4,022,390	$	3,761,120	(2)	$	3,256,720
Long-term debt (5)	$	927,662			$	812,163		$	645,696	$	716,359		$	300,000
Other long-term liabilities (6)	$	140,626			$	148,785		$	158,331	$	167,545		$	113,830
Cash dividends per common share	$	—			$	—		$	—	$	—		$	—

_________________________ 

(1) During the third quarter of 2012, we made the decision to prospectively use mark-to-market accounting for our economic hedges. Previously, we reported all gains (losses) in oil and natural gas revenues and now we reflect gains (losses) on non-designated hedges and the ineffectiveness from cash flow hedges along with other revenue items in other income (expense) below income from operations. Prior year amounts have been reclassified to conform to current year presentation.

(2) In June 2012 and December 2012, due to low 12-month average commodity prices, we incurred non-cash ceiling test write-downs of our oil and natural gas properties of $115.9 million pre-tax ($72.1 million, net of tax) and $167.7 million pre-tax ($104.4 million, net of tax), respectively.

(3) In December 2014, we incurred a non-cash ceiling test write-down of our oil and natural gas properties of $76.7 million pre-tax ($47.7 million, net of tax), a non-cash write-down associated with the removal of 31 drilling rigs from our fleet along with certain other equipment and drill pipe of $74.3 million pre-tax ($46.3 million, net of tax), and a non-cash write-down associated with a reduction in the carrying value of three midstream segment systems of $7.1 million pre-tax ($4.4 million, net of tax).

(4) In total for 2015, we incurred non-cash ceiling test write-downs on our oil and natural gas properties of $1.6 billion pre-tax ($1.0 billion, net of tax). We also incurred a non-cash write-down on certain drilling rigs and other equipment of approximately $8.3 million pre-tax ($5.1 million, net of tax), and a non-cash write-down associated with a reduction in the carrying value of three midstream segment systems of $27.0 million pre-tax ($16.8 million, net of tax).

(5) Long-term debt is net of unamortized discount.

(6) Includes non-current derivative liabilities.

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Item 7.     Management’s Discussion and Analysis of Financial Condition and Results of Operations

Please read the following discussion of our financial condition and results of operations in conjunction with the consolidated financial statements and related notes included in Item 8 of this report.

General

We operate, manage, and analyze our results of operations through our three principal business segments:

• Oil and Natural Gas – carried out by our subsidiary Unit Petroleum Company. This segment explores, develops, acquires, and produces oil and natural gas properties for our own account.

• Contract Drilling – carried out by our subsidiary Unit Drilling Company. This segment contracts to drill onshore oil and natural gas wells for others and for our own account.

• Mid-Stream – carried out by our subsidiary Superior Pipeline Company, L.L.C. and its subsidiaries. This segment buys, sells, gathers, processes, and treats natural gas for third parties and for our own account.

Business Outlook

As discussed in other parts of this report, the success of our business and each of our three main operating segments depend, on a large part, on the prices we receive for our oil and natural gas production and the demand for oil and natural gas as well as for our drilling rigs which, in turn, influences the amounts we can charge for the use of those drilling rigs. While our operations are located within the United States, events outside the United States can also impact us and our industry.

Both within the United States and the world, deteriorating commodity prices have brought about significant changes affecting our industry and us. The decline in commodity prices has caused us (and other oil and gas companies) to reduce our level of drilling activity and spending. When drilling activity and spending decline for any sustained period of time the rates for and the number of our drilling rigs working also tend to decline. In addition, lower commodity prices for any sustained period of time could impact the liquidity condition of some of our industry partners and customers, which, in turn, might limit their ability to meet their financial obligations to us.

It is uncertain how long the current depressed prices for oil and natural gas products will continue. As noted elsewhere in this report, commodity prices are subject to a number of factors most of which are beyond our control.

The impact on our business and financial results as a consequence of the reduction in oil and NGLs (and to a lesser extent natural gas) prices has had a number of consequences for us, including the following:

• In December 2015, we determined the value of certain unproved oil and gas properties were diminished (in part or in whole) based on an impairment evaluation and our anticipated future exploration plans. That determination resulted in $114.4 million of costs associated with the unproved properties being added to the capitalized costs to be amortized. For the full year of 2015, we incurred a cumulative non-cash ceiling test write-down of our oil and natural gas properties of $1.6 billion pre-tax ($1.0 billion net of tax). We expect to incur a non-cash ceiling test write-down in the first quarter of 2016. It is difficult to predict with reasonable certainty the amount of expected future impairments given the many factors impacting the ceiling test calculation including, but not limited to, future pricing, operating costs, drilling and completion costs, upward or downward reserve revisions, reserve additions, and tax attributes. Subject to these numerous factors and inherent limitations, holding these factors constant and only adjusting the 12-month average price to an estimated first quarter ending average (holding February 2016 prices constant for the remaining one month of 2016), we currently anticipate that we could recognize an impairment in the first quarter of 2016 of approximately $60 million pre-tax. The impact of the significantly higher commodity prices used in the ceiling test 12-month average price calculation will lessen as those higher prices will roll off from the calculation.

• We have reduced the number of gross wells we plan to drill in 2016 by approximately 57-74% from the number of gross wells drilled in 2015 due to reduced cash flow from lower commodity prices.

• In December 2014, we removed from service 31 drilling rigs, some older top drives, and certain drill pipe no longer marketable in the current environment and sold most of these items at auction during 2015.

• Several of our drilling rig customers significantly reduced their drilling budgets, resulting in a significant reduction in the average utilization of our drilling rig fleet. At December 31, 2014, we had 75 drilling rigs operating, during 2015,

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we averaged 34.7 drilling rigs operating, and at February 12, 2016, this number was 20. We currently expect further reductions in 2016.

• In December 2015, our mid-stream segment incurred a $27.0 million pre-tax write-down of three of its systems due to anticipated future cash flow and future development around these systems not being sufficient to support their carrying value. The estimated future cash flows were less than the carrying value on these systems.

• Due to the low NGLs prices, we are operating our processing facilities in full ethane rejection mode which reduces the amount of liquids sold. As long as NGLs prices continue to be depressed, we expect to continue operating in full ethane rejection mode. As low commodity prices continue, we expect the reductions in drilling activity around our systems will reduce the number of new wells available to connect to our systems and result in lower processed volumes as production from wells previously connected naturally decline.

• Effective with the October 2015 redetermination, the lenders of our credit agreement decreased our borrowing base from $725.0 million to $550.0 million. This new amount is above the $500.0 million commitment we have elected under the credit agreement. While it is anticipated deteriorating commodity prices may result in a further reduction to our current borrowing base, we believe our liquidity will be adequate to carry out our 2016 capital plans.

We have reduced our total 2016 capital budget by a range of approximately 59-65% as compared to 2015, excluding acquisitions and ARO liability. Our budget is designed to keep our capital expenditures below our anticipated cash flow and proceeds from non-core asset sales.

Our 2016 current capital expenditures budget is based on realized prices for the year of $34.57 per barrel of oil, $8.01 per barrel of NGLs, and $2.24 per Mcf of natural gas. Our budget is subject to possible periodic adjustments for various reasons including changes in commodity prices and industry conditions. Funding for the budget will come primarily from our cash flow, non-core asset sales, and, if necessary, borrowings under our credit agreement.

In response to the adverse impacts that the lower commodity prices had on us in 2015 as well as our industry we carried out the following during 2015 and early 2016:

• We are in the process of consolidating from five to two the number of divisions within our drilling segment allowing for us to further reduce the costs associated with operating the divisions.

• The higher end of our 2016 capital expenditure budget for exploration and production segment is designed with the intent to incur the majority of those expenditures in the latter part of the year thus allowing us to take into account future commodity price movement before we incur those expenditures.

• We have implemented certain reduction in our office and field workforces to account for the reduction in our operating activities.

• As of February 12, 2016, we have sold approximately $37.4 million of non-core oil and gas properties in 2016 using the majority of the proceeds to pay down our borrowings under our bank credit agreement.

Executive Summary

Oil and Natural Gas

Fourth quarter 2015 production from our oil and natural gas segment was 4,757,000 barrels of oil equivalent (Boe), a 6%decreasefrom the third quarter of 2015 and a 2%decreasefrom the fourth quarter of 2014. These decreases came mostly from lower production due to reduced drilling activity and the replacement of reserves as a result of lower oil and NGLs prices. Oil and NGLs production during the fourth quarter of 2015 was 44% of our total production compared to 47% of our total production during the fourth quarter of 2014.

Fourth quarter 2015 oil and natural gas revenues decreased 22%from the third quarter of 2015 and decreased 54%from the fourth quarter of 2014. These deceases were primarily due to lower oil, natural gas, and NGLs prices and to a lesser extent from reduced production volumes.

Our natural gas and oil prices for the fourth quarter of 2015decreased 16% and 5%, respectively, compared to the third quarter of 2015 while our NGLs prices increased 26%. Our NGLs, oil, and natural gas prices decreased 56%, 41%, and 40%, respectively compared to the fourth quarter of 2014.

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Direct profit (oil and natural gas revenues less oil and natural gas operating expense) decreased 32%from the third quarter of 2015 and 64%from the fourth quarter of 2014. The decreases were primarily attributable to decreased oil, natural gas, and NGLs prices.

Operating cost per Boe produced for the fourth quarter of 2015decreased 1%from the third quarter of 2015 and decreased 31%from the fourth quarter of 2014. The decrease from the third quarter of 2015 was primarily due to lower lease operating expenses (LOE ) partially offset by higher gross production taxes. The decrease from the fourth quarter of 2014 was primarily due to lower salt water disposal expense, lower LOE, lower gross production tax from lower sales revenue, and lower general and administrative expenses.

For 2016, we have derivative contracts covering approximately 2,850 Bbls per day of oil production. For the month of January, we have hedged approximately 90,500 MMBtu per day of natural gas production and for the remainder of 2016, we have hedged approximately 100,500 MMBtu per day of natural gas production. For 2017, we have hedged approximately 750 Bbls per day of oil production and 25,000 MMBtu per day of natural gas production.

At December 31, 2015, the following non-designated hedges were outstanding:

Term	Commodity	Contracted Volume	Weighted Average  Fixed Price for Swaps	Contracted Market
Jan’16 – Dec’16	Natural gas – swap	35,000 MMBtu/day	$2.625	IF – NYMEX (HH)
Jan’16 – Dec'16	Natural gas – collar	42,000 MMBtu/day	$2.40 - $2.88	IF – NYMEX (HH)
Jan’16 – Dec'16	Natural gas – three-way collar	13,500 MMBtu/day	$2.70 - $2.20 - $3.26	IF – NYMEX (HH)
Jan’17 – Dec'17	Natural gas – three-way collar	15,000 MMBtu/day	$2.50 - $2.00 - $3.32	IF – NYMEX (HH)
Jan’16 – Jun'16	Crude oil – collar	2,150 Bbl/day	$46.36 - $55.62	WTI – NYMEX
Jul’16 – Dec'16	Crude oil – collar	1,450 Bbl/day	$47.50 - $56.40	WTI – NYMEX
Jan’16 – Dec'16	Crude oil – three-way collar	700 Bbl/day	$46.50 - $35.00 - $57.00	WTI – NYMEX
Jul’16 – Dec'16	Crude oil – three-way collar (1)	700 Bbl/day	$47.50 - $35.00 - $63.50	WTI – NYMEX
Jan’17 – Dec'17	Crude oil – three-way collar	750 Bbl/day	$50.00 - $37.50 - $63.90	WTI – NYMEX

_________________________

(1) We pay our counterparty a premium, which can be and is being deferred until settlement.

Subsequent to December 31, 2015, the following non-designated hedges were entered into:

Term	Commodity	Contracted Volume	Weighted Average  Fixed Price for Swaps	Contracted Market
Feb’16 – Dec'16	Natural gas – swap	10,000 MMBtu/day	$2.495	IF – NYMEX (HH)
Jan’17 – Dec'17	Natural gas – swap	10,000 MMBtu/day	$2.795	IF – NYMEX (HH)

During 2015, we participated in the drilling of 58 wells (34.99 net wells). For 2016, we plan to participate in the drilling of approximately 15 to 25 gross wells. Our 2016 production guidance is approximately 16.9 to 17.4 MMBoe, a decrease of 13-16% from 2015, actual results will be subject to many factors. This segment’s capital budget for 2016 is a range from $109.0 to $131.0 million, a 52-60% decrease from 2015, excluding acquisitions and ARO liability. As of February 12, 2016, we have sold approximately $37.4 million of non-core oil and gas properties in 2016.

Contract Drilling

The average number of drilling rigs we operated for 2015 was 34.7 compared to 75.4 in 2014. Late in the fourth quarter of 2014, the number of our drilling rigs operating started to decline and has continued to decline throughout 2015 due to lower commodity prices and operators reducing their drilling budgets. As of December 31, 2015, 26 drilling rigs were operating.

Revenue for the fourth quarter of 2015 decreased 22% and 63% from the third quarter of 2015 and fourth quarter of 2014, respectively. The decreases were primarily due to fewer drilling rigs operating and lower dayrates.

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Dayrates for the fourth quarter of 2015 averaged $18,604, a 1% and 9%decreasefrom the third quarter of 2015 and the fourth quarter of 2014, respectively. The decreases were primarily due to downward pressure on dayrates with lower demand.

Operating costs for the fourth quarter of 2015 decreased 8% and 58% from the third quarter of 2015 and the fourth quarter of 2014, respectively. The decreases were due primarily to fewer drilling rigs operating.

Direct profit (contract drilling revenue less contract drilling operating expense) for the fourth quarter of 2015decreased 39% and 69%from the third quarter of 2015 and the fourth quarter of 2014, respectively. For both comparative periods, we had fewer drilling rigs operating with lower dayrates.

Operating cost per day for the fourth quarter of 2015increased 6% and 25%over the third quarter of 2015 and the fourth quarter of 2014, respectively. The increases were primarily due to less revenue days partially offset by lower direct rig expense due to fewer drilling rigs operating for both comparative periods.

During 2015, almost all of our working drilling rigs were drilling horizontal or directional wells for oil and NGLs. Today, the drastic reduction in commodity prices for oil and natural gas has changed demand for drilling rigs. All of these factors ultimately affect the demand and mix of the type of drilling rigs used by our customers. The future demand for and the availability of drilling rigs to meet that demand will have an impact on our future dayrates.

As of December 31, 2015, we had nine term drilling contracts with original terms ranging from six months to three years. Five of these contracts are up for renewal in 2016, (two in the first quarter, two in the third quarter, and one in the fourth quarter) and four are up for renewal in 2017. Term contracts may contain a fixed rate for the duration of the contract or provide for rate adjustments within a specific range from the existing rate. Some operators who had signed term contracts have opted to release the drilling rig and pay an early termination penalty for the remaining term of the contract. During 2015, we recorded $29.0 million in early termination fees.

In December 2014, we removed from service 31 drilling rigs, some older top drives, and certain drill pipe no longer marketable in the current environment and based on the estimated market value from third-party assessments, we recorded a write-down of approximately $74.3 million, pre-tax. During the first quarter of 2015, we sold one of these drilling rigs to an unaffiliated third party. The proceeds of this sale, less costs to sell, exceeded the $0.3 million net book value of the drilling rig resulting in a gain of $7,900. During the second quarter, we recorded an additional write-down on the remaining drilling rigs and other equipment of approximately $8.3 million pre-tax based on the estimated market value from similar auctions. During the third quarter, we sold the remaining 30 drilling rigs and most of the equipment in an auction. The proceeds from the sale of those assets, less costs to sell, was less than the $11.0 million net book value resulting in a loss of $7.3 million pre-tax. Some of the equipment that was not sold at the auction will be sold within the next twelve months and remain classified as assets held for sale. The net book value of those assets is $0.6 million.

We have completed our current new BOSS drilling rig program for 2015. Eight new BOSS drilling rigs have been placed into service. Some of the long lead time components for three additional BOSS drilling rigs were ordered during 2014 in anticipation for future demand of the BOSS drilling rigs. With the decline in the drilling market, many of these long lead time components were either postponed for later delivery or canceled altogether. Currently, we do not have any contracts to build new BOSS drilling rigs. Our anticipated 2016 capital expenditures for this segment range from $9.0 million to $11.0 million, an 87-89% decrease from 2015.

Mid-Stream

Fourth quarter 2015 liquids sold per day decreased 3% and 18%from the third quarter of 2015 and the fourth quarter of 2014, respectively. The decrease from third quarter of 2015 was due to more effectively operating our processing facilities in full ethane rejection mode. The decrease from the prior year was due to operating in ethane rejection mode in 2015. For the fourth quarter of 2015, gas processed per day decreased 8%from the third quarter of 2015 and increased 4%over the fourth quarter of 2014. The decrease from the third quarter was due to general declines in wells. The increase over prior year was due to connecting new wells to both existing and newly constructed systems to replace production declines from wells already connected. For the fourth quarter of 2015, gas gathered per day increased 1% and 10%over the third quarter of 2015 and the fourth quarter of 2014, respectively. These increases were primarily from well connects throughout 2015.

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NGLs prices in the fourth quarter of 2015 were essentially unchanged from the prices received in the third quarter of 2015 and decreased 38%from the prices received in the fourth quarter of 2014. Because certain of the contracts used by our mid-stream segment for NGLs transactions are commodity-based contracts – under which we receive a share of the proceeds from the sale of the NGLs – our revenues from those commodity-based contracts fluctuate based on NGLs prices.

Direct profit (mid-stream revenues less mid-stream operating expense) for the fourth quarter of 2015decreased 10%from the third quarter of 2015 and decreased 6%from the fourth quarter of 2014. These decreases were primarily due to lower NGLs, natural gas, and condensate prices reducing revenues. Total operating cost for this segment for the fourth quarter of 2015decreased 10% and 47%from the third quarter of 2015 and the fourth quarter of 2014, respectively due primarily to the lower cost of gas purchased.

At our Hemphill Texas system with the completion of the nine-mile pipeline that connects our Buffalo Wallow gathering system to our Hemphill processing facility, we began transporting Buffalo Wallow gathered gas to our Hemphill facility for processing. At our Hemphill processing facility, we have three operational processing skids that provide approximately 135 MMcf per day of processing capacity.

In central Oklahoma at our Perkins processing facility, we completed the upgrade of our processing facility which increased our total processing capacity from 20 MMcf per day to 27 MMcf per day. These improvements consist of processing plant upgrades along with projects to improve recoveries at this facility. During 2015, we connected 11 new wells to this system from several producers.

Also in central Oklahoma, at our Minco processing facility, we completed upgrades to this facility which improved our processing capacity and allowed us to gather and process additional liquid rich gas from third-party producers. With this upgrade the total processing capacity of this system was increased to approximately 15 MMcf per day.

In the Mississippian play in north central Oklahoma, we completed the upgrade of our Bellmon gathering system along with the installation of additional compressors. This will allow us to receive additional volume from third-party producers in the area. We connected 40 new wells to this system from several producers during 2015. At this processing facility we have two operational processing skids that provide total processing capacity of approximately 90 MMcf per day.

In the Appalachian region, we completed the northern expansion of the Pittsburgh Mills gathering system into Butler County, Pennsylvania. This project includes a seven-mile trunkline along with a related compressor station. With the completion of this project we also gain an additional outlet for our gas into NiSource pipeline. The Clinton compressor station located in Butler County, Pennsylvania was completed and became operational in the fourth quarter of 2015. With the completion of this expansion project, we now have the ability to connect additional wells that are scheduled to be drilled in this area in 2016.

Also in the Appalachian area, we completed the construction of our new fee-based gathering system, Snow Shoe Gathering System, in Centre County, Pennsylvania. This system consists of approximately 12 miles of gathering pipeline. The pipeline has been installed and is now operational. We began flowing gas on this pipeline in January 2016.

Anticipated 2016 capital expenditures for this segment range from $22.0 million to $24.0 million, a 62-65% decrease from 2015.

Critical Accounting Policies and Estimates

Summary

In this section, we identify those critical accounting policies we follow in preparing our financial statements and related disclosures. Many of these policies require us to make difficult, subjective, and complex judgments in the course of making estimates of matters that are inherently imprecise. Some accounting policies involve judgments and uncertainties to such an extent that there is reasonable likelihood that materially different amounts could have been reported under different conditions, or if different assumptions had been used. We evaluate our estimates and assumptions on a regular basis. We base our estimates on historical experience and various other assumptions that we believe are reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from

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other sources. Actual results may differ from these estimates and assumptions used in preparation of our financial statements. In the following discussion we will attempt to explain the nature of these estimates, assumptions and judgments, as well as the likelihood that materially different amounts would be reported in our financial statements under different conditions or using different assumptions.

The following table lists the critical accounting policies, identifies the estimates and assumptions that can have a significant impact on the application of these accounting policies, and the financial statement accounts that are affected by these estimates and assumptions.

Accounting Policies	Estimates or Assumptions	Accounts Affected
Full cost method of accounting for oil, NGLs, and natural gas properties	•    Oil, NGLs, and natural gas reserves, estimates, and related present value of future net revenues •    Valuation of unproved properties •    Estimates of future development costs	•    Oil and natural gas properties •    Accumulated depletion, depreciation and amortization •    Provision for depletion, depreciation and amortization •    Impairment of oil and natural gas properties •    Long-term debt and interest expense
Accounting for ARO for oil, NGLs, and natural gas properties	•    Cost estimates related to the plugging and abandonment of wells •    Timing of cost incurred	•    Oil and natural gas properties •    Accumulated depletion, depreciation and amortization •    Provision for depletion, depreciation and amortization •    Current and non-current liabilities •    Operating expense
Accounting for impairment of long-lived assets	•    Forecast of undiscounted estimated future net operating cash flows	•    Drilling and mid-stream property and equipment •    Accumulated depletion, depreciation and amortization •    Provision for depletion, depreciation and amortization •    Other intangible assets
Goodwill	•    Forecast of discounted estimated future net operating cash flows •    Terminal value •    Weighted average cost of capital	•    Goodwill
Accounting for value of stock compensation awards	•    Estimates of stock volatility •    Estimates of expected life of awards       granted •    Estimates of rates of forfeitures	•    Oil and natural gas properties •    Shareholder’s equity •    Operating expenses •    General and administrative expenses
Accounting for derivative instruments and hedging	•    Hedges measured for effectiveness and ineffectiveness (2013) •    Non-qualifying and qualifying derivatives measured at fair value	•    Current and non-current derivative assets and liabilities •    Other comprehensive income as a component of equity (2013) •    Oil and natural gas revenue (2013) •    Gain (loss) on derivatives not designated as hedges and hedge ineffectiveness, net

Significant Estimates and Assumptions

Full Cost Method of Accounting for Oil, NGLs, and Natural Gas Properties. The determination of our oil, NGLs, and natural gas reserves is a subjective process. It entails estimating underground accumulations of oil, NGLs, and natural gas that cannot be measured in an exact manner. The degree of accuracy of these estimates depends on a number of factors, including, the quality and availability of geological and engineering data, the precision of the interpretations of that data, and individual judgments. Each year, we hire an independent petroleum engineering firm to audit our internal evaluation of our reserves. The audit of our reserve wells or locations as of December 31, 2015 covered those that we projected to comprise 79% of the total proved developed discounted future net income and 81% of the total proved discounted future net income based on the

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unescalated pricing policy of the SEC. Included in Part I, Item 1 of this report are the qualifications of our independent petroleum engineering firm and our employees responsible for the preparation of our reserve reports.

As a general rule, the accuracy of estimating oil, NGLs, and natural gas reserves varies with the reserve classification and the related accumulation of available data, as shown in the following table:

Type of Reserves	Nature of Available Data	Degree of Accuracy
Proved undeveloped	Data from offsetting wells, seismic data	Less accurate
Proved developed non-producing	The above as well as logs, core samples, well tests, pressure data	More accurate
Proved developed producing	The above as well as production history, pressure data over time	Most accurate

Assumptions of future oil, NGLs, and natural gas prices and operating and capital costs also play a significant role in estimating these reserves as well as the estimated present value of the cash flows to be received from the future production of those reserves. Volumes of recoverable reserves are influenced by the assumed prices and costs due to the economic limit (that point when the projected costs and expenses of producing recoverable oil, NGLs, and natural gas reserves is greater than the projected revenues from the oil, NGLs, and natural gas reserves). But more significantly, the estimated present value of the future cash flows from our oil, NGLs, and natural gas reserves is sensitive to prices and costs, and may vary materially based on different assumptions. Companies, like ours, using full cost accounting use the unweighted arithmetic average of the commodity prices existing on the first day of each of the 12 months before the end of the reporting period to calculate discounted future revenues, unless prices were otherwise determined under contractual arrangements.

We compute DD&A on a units-of-production method. Each quarter, we use the following formulas to compute the provision for DD&A for our producing properties:

• DD&A Rate = Unamortized Cost / End of Period Reserves Adjusted for Current Period Production

• Provision for DD&A = DD&A Rate x Current Period Production

Oil, NGLs, and natural gas reserve estimates have a significant impact on our DD&A rate. If future reserve estimates for a property or group of properties are revised downward, the DD&A rate will increase as a result of the revision. Alternatively, if reserve estimates are revised upward, the DD&A rate will decrease. Based on our 2015 production level of 20.0 MMBoe, a decrease in the amount of our 2015 oil, NGLs, and natural gas reserves by 5% would increase our DD&A rate by $0.48 per Boe and would decrease pre-tax income by $9.6 million annually. Conversely, an increase in our 2015 oil, NGLs, and natural gas reserves by 5% would decrease our DD&A rate by $0.48 per Boe and would increase pre-tax income by $9.6 million annually.

The DD&A expense on our oil and natural gas properties is calculated each quarter using period end reserve quantities adjusted for current period production.

We account for our oil and natural gas exploration and development activities using the full cost method of accounting. Under this method, we capitalize all costs incurred in the acquisition, exploration, and development of oil and natural gas properties. At the end of each quarter, the net capitalized costs of our oil and natural gas properties are limited to that amount which is the lower of unamortized costs or a ceiling. The ceiling is defined as the sum of the present value (using a 10% discount rate) of the estimated future net revenues from our proved reserves (based on the unescalated 12-month average price on our oil, NGLs, and natural gas adjusted for any cash flow hedges), plus the cost of properties not being amortized, plus the lower of the cost or estimated fair value of unproved properties included in the costs being amortized, less related income taxes. If the net capitalized costs of our oil and natural gas properties exceed the ceiling, we are required to write-down the excess amount. A ceiling test write-down is a non-cash charge to earnings. If required, it reduces earnings and impacts shareholders’ equity in the period of occurrence and results in lower DD&A expense in future periods. Once incurred, a write-down cannot be reversed.

The risk that we will be required to write-down the carrying value of our oil and natural gas properties increases when the prices for oil, NGLs, and natural gas are depressed or if we have large downward revisions in our estimated proved oil, NGLs, and natural gas reserves. Application of these rules during periods of relatively low prices, even if temporary, increases the

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chance of a ceiling test write-down. At December 31, 2015, our reserves were calculated based on applying 12-month 2015 average unescalated prices of $50.28 per barrel of oil, $19.47 per barrel of NGLs, and $2.59 per Mcf of natural gas (then

adjusted for price differentials) over the estimated life of each of our oil and natural gas properties. In total for 2015, we incurred non-cash ceiling test write-downs of our oil and natural gas properties of $1.6 billion pre-tax ($1.0 billion net of tax) due to the inclusion of the impaired value of certain unproved properties and a reduction of the 12-month average commodity prices during the year.

We expect to incur a non-cash ceiling test write-down in the first quarter of 2016. It is difficult to predict with reasonable certainty the amount of expected future impairments given the many factors impacting the ceiling test calculation including, but not limited to, future pricing, operating costs, drilling and completion costs, upward or downward reserve revisions, reserve additions, and tax attributes. Subject to these numerous factors and inherent limitations, holding these factors constant and only adjusting the 12-month average price to an estimated first quarter ending average (holding February 2016 prices constant for the remaining one month of 2016), we currently anticipate that we could recognize an impairment in the first quarter of 2016 of approximately $60 million pre-tax. The estimated first quarter 2016 impairment is partially the result of a decrease in our proved undeveloped reserves of approximately 26%. These anticipated decreases are primarily due to certain locations no longer being economical under the adjusted 12-month average price for the first quarter. Based on this estimated 12-month average price, we would eliminate those locations from our future development plan. The impact of the significantly higher commodity prices used in the ceiling test 12-month average price calculation will lessen as those higher prices will roll off from the calculation. Given the uncertainty associated with the factors used in calculating our estimate of both our future period ceiling test write-down and the decrease in our undeveloped reserves, these estimates should not necessarily be construed as indicative of our future development plans or financial results.

Derivative instruments qualifying as cash flow hedges are included in the computation of limitation on capitalized costs. All of our cash flow hedges expired as of December 31, 2013 and no longer effect this computation. Our oil and natural gas derivatives are discussed in Note 12 of the Notes to our Consolidated Financial Statements.

We use the sales method for recording natural gas sales. This method allows for the recognition of revenue, which may be more or less than our share of pro-rata production from certain wells. Our policy is to expense our pro-rata share of lease operating costs from all wells as incurred. The expenses relating to the wells in which we have a production imbalance are not material.

Costs Withheld from Amortization. Costs associated with unproved properties are excluded from our amortization base until we have evaluated the properties. The costs associated with unevaluated leasehold acreage and related seismic data, wells currently drilling and capitalized interest are initially excluded from our amortization base. Leasehold costs are either transferred to our amortization base with the costs of drilling a well on the lease or are assessed at least annually for possible impairment or reduction in value. Leasehold costs are transferred to our amortization base to the extent a reduction in value has occurred.

Our decision to withhold costs from amortization and the timing of the transfer of those costs into the amortization base involve a significant amount of judgment and may be subject to changes over time based on several factors, including our drilling plans, availability of capital, project economics and results of drilling on adjacent acreage. In December 2014 and December 2015, we determined the value of certain unproved oil and gas properties were diminished (in part or in whole) based on an impairment evaluation and our anticipated future exploration plans. That determination resulted in $73.7 million in 2014 and $114.4 million in 2015 of costs associated with the unproved properties being added to the capitalized costs to be amortized. At December 31, 2015, we had a total of approximately $337.1 million of costs excluded from the amortization base of our full cost pool.

Accounting for ARO for Oil, NGLs, and Natural Gas Properties. We record the fair value of liabilities associated with the retirement of assets having a long life. In our case, when the reserves in each of our oil or gas wells deplete or otherwise become uneconomical, we are required to incur costs to plug and abandon the wells. These costs are recorded in the period in which the liability is incurred (at the time the wells are drilled or acquired). We do not have any assets restricted for the purpose of settling these ARO liabilities. Our engineering staff uses historical experience to determine the estimated plugging costs taking into account the type of well (either oil or natural gas), the depth of the well and physical location of the well to determine the estimated plugging costs.

Accounting for Impairment of Long-Lived Assets. Drilling equipment, transportation equipment, gas gathering and processing systems, and other property and equipment are carried at cost less accumulated depreciation. Renewals and

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enhancements are capitalized while repairs and maintenance are expensed.We review the carrying amounts of long-lived assets for potential impairment annually, typically during the fourth quarter, or when events occur or changes in circumstances suggest that these carrying amounts may not be recoverable. Changes that could prompt such an assessment may include equipment obsolescence, changes in the market demand for a specific asset, changes in commodity prices, periods of relatively low drilling rig utilization, declining revenue per day, declining cash margin per day, or overall changes in general market conditions. Assets are determined to be impaired if a forecast of undiscounted estimated future net operating cash flows directly related to the asset, including disposal value if any, is less than the carrying amount of the asset. If any asset is determined to be impaired, the loss is measured as the amount by which the carrying amount of the asset exceeds its fair value. The estimate of fair value is based on the best information available, including prices for similar assets. Changes in these estimates could cause us to reduce the carrying value of property and equipment.Asset impairment evaluations are, by nature, highly subjective. They involve expectations about future cash flows generated by our assets and reflect management’s assumptions and judgments regarding future industry conditions and their effect on future utilization levels, dayrates, and costs. The use of different estimates and assumptions could result in materially different carrying values of our assets.

As of December 31, 2015, with continuing declines to commodity prices and an outlook that commodity prices may be lower for longer, we lowered our expectations about future utilization of our drilling rigs and associated cash flows.  We performed a Step 1 analysis as required by ASC 360-10-35 to assess the recoverability of long-lived assets within our contract drilling segment.  With respect to these assets, future cash flows were estimated over the expected remaining life of the assets. Management determined that, on an undiscounted basis, expected cash flows exceeded the carrying value of the long-lived assets within our contract drilling segment by 99%, and there was no impairment at December 31, 2015.

On a periodic basis, we evaluate our fleet of drilling rigs for marketability based on the condition of inactive rigs, expenditures that would be necessary to bring them to working condition and the expected demand for drilling services by rig type. The components comprising inactive rigs are evaluated, and those components with continuing utility to the Company’s other marketed rigs are transferred to other rigs or to its yards to be used as spare equipment. The remaining components of these rigs are retired. In December 2014, we removed from service 31 drilling rigs, some older top drives, and certain drill pipe no longer marketable in the current environment. We estimated the fair value of the drilling rigs and other assets based on the estimate market value from third-party assessments. Based on these estimates, we recorded a write-down of approximately $74.3 million pre-tax. In June 2015, we recorded an additional write-down on the remaining drilling rigs and other equipment of approximately $8.3 million pre-taxed based on the estimated market value from similar auctions.

In 2014, our mid-stream segment incurred a $7.1 million pre-tax write-down of three of its systems, Weatherford, Billy Rose, and Spring Creek and in 2015, incurred a $27.0 million pre-tax write-down of its systems, Bruceton Mills, Spring Creek, and Midwell due to anticipated future cash flow and future development around these systems not being sufficient to support their carrying value. The estimated future cash flows were less than the carrying value on these systems. No significant impairment was recorded at December 31, 2013.

Goodwill. Goodwill represents the excess of the cost of acquisitions over the fair value of the net assets acquired. Goodwill is not amortized, but an impairment test is performed at least annually to determine whether the fair value has decreased and is performed additionally when events indicate an impairment may have occurred. For purposes of impairment testing, goodwill is evaluated at the reporting unit level. Our goodwill is all related to our contract drilling segment, and accordingly, the impairment test is generally based on the estimated discounted future net cash flows of our drilling segment, utilizing discount rates and other factors in determining the fair value of our drilling segment. Inputs in our estimated discounted future net cash flows include drilling rig utilization, day rates, gross margin percentages, and terminal value.No goodwill impairment was recorded at December 31, 2015, 2014, or 2013. Based on our impairment test performed as of December 31, 2015, the fair value of our drilling segment exceeded its carrying value by 19%. A period of sustained reduced commodity prices resulting in further reductions in the number of our drilling rigs working and the rates we charge for them could result in a non-cash goodwill impairment in future periods.

Turnkey and Footage Drilling Contracts. Because our contract drilling operations do not bear the risk of completion of a well being drilled under a “daywork” contract, we recognize revenues and expense generated under “daywork” contracts as the services are performed. Under “footage” and “turnkey” contracts we bear the risk of completion of the well, so revenues and expenses are recognized when the well is substantially completed. Substantial completion is determined when the well bore reaches the depth specified in the contract. The entire amount of a loss, if any, is recorded when the loss can be reasonably determined, however, any profit is recorded only at the time the well is finished. The costs of drilling contracts uncompleted at the end of the reporting period (which includes expenses incurred to date on “footage” or “turnkey” contracts) are included in other current assets. We did not drill any wells under turnkey or footage contracts in 2015, 2014, or 2013.

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Accounting for Value of Stock Compensation Awards. To account for stock-based compensation, compensation cost is measured at the grant date based on the fair value of an award and is recognized over the service period, which is usually the vesting period. We elected to use the modified prospective method, which requires compensation expense to be recorded for all unvested stock options and other equity-based compensation beginning in the first quarter of adoption. The determination of the fair value of an award requires significant estimates and subjective judgments regarding, among other things, the appropriate option pricing model, the expected life of the award and performance vesting criteria assumptions. As there are inherent uncertainties related to these factors and our judgment in applying them to the fair value determinations, there is risk that the recorded stock compensation may not accurately reflect the amount ultimately earned by the employee.

Accounting for Derivative Instruments and Hedging. For our economic hedges that we did not apply cash flow accounting to, any changes in their fair value occurring before their maturity (i.e., temporary fluctuations in value) are reported in gain (loss) on derivatives not designated as hedges and hedge ineffectiveness, net in our Consolidated Statements of Operations. The commodity derivative instruments we had under cash flow accounting expired as of December 2013. Previous changes in the fair value of derivatives designated as cash flow hedges, to the extent they were effective in offsetting cash flows attributable to the hedged risk, were recorded in OCI until the hedged item was recognized into earnings. When the hedged item was recognized into earnings, it was reported in oil and natural gas revenues. Any change in fair value resulting from ineffectiveness was recognized in gain (loss) on derivatives not designated as hedges and hedge ineffectiveness, net.

New Accounting Standards

Income Taxes: Balance Sheet Classification of Deferred Taxes. The FASB has issued ASU 2015-17. This changes how deferred taxes are classified on organizations' balance sheets. Organizations will be required to classify all deferred tax assets and liabilities as noncurrent. The amendments apply to all organizations that present a classified balance sheet. For public companies, the amendments are effective for financial statements issued for annual periods beginning after December 15, 2016, and interim periods within those annual periods. Early adoption of the amendments is permitted. We are in the process of evaluating the impact it will have on our financial statements.

Interest—Imputation of Interest: Simplifying the Presentation of Debt Issuance Costs. The FASB has issued ASU 2015-03. The amendments in this ASU require that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. The FASB has also issued ASU 2015-15. The amendments in this ASU allow an entity to defer and present debt issuance cost as an asset and subsequently amortize the deferred debt issuance costs ratably over the term of the line-of-credit arrangement, regardless of whether there are any outstanding borrowings on the line-of-credit arrangement. For public business entities, the amendments are effective for financial statements issued for fiscal years beginning after December 15, 2015, and interim periods within those fiscal years. Early adoption of the amendments is permitted for financial statements that have not been previously issued. The amendments should be applied on a retrospective basis, wherein the balance sheet of each individual period presented should be adjusted to reflect the period-specific effects of applying the new guidance. We do not expect the adoption of this guidance will have a material impact on our financial statements.

Revenue from Contracts with Customers. The FASB has issued ASU 2014-09. This affects any entity using U.S. GAAP that either enters into contracts with customers to transfer goods or services or enters into contracts for the transfer of nonfinancial assets unless those contracts are within the scope of other standards (e.g., insurance contracts or lease contracts). The core principle of the guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The FASB has issued 2015-14, which defers the effective date to annual reporting periods beginning after December 15, 2017, including interim reporting periods within that reporting period. We are in the process of evaluating the impact it will have on our financial statements.

Financial Condition and Liquidity

Summary.

Our financial condition and liquidity primarily depends on the cash flow from our operations and borrowings under our credit agreement. The principal factors determining the amount of our cash flow are:

• the quantity of natural gas, oil, and NGLs we produce;

• the prices we receive for our natural gas, oil, and NGLs production;

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• the demand for and the dayrates we receive for our drilling rigs; and

• the fees and margins we obtain from our natural gas gathering and processing contracts.

We currently believe we have sufficient cash flow and liquidity to meet our obligations and remain in compliance with our debt covenants for the next twelve months. Our ability to meet our debt covenants (under our credit agreement as well as our Indenture) and our capacity to incur additional indebtedness will depend on our future performance, which in turn will be affected by financial, business, economic, regulatory, and other factors. For example, lower oil, natural gas, and NGLs prices since the last redetermination could result in a redetermination of the borrowing base under our credit agreement to a lower level and therefore reduce or limit our ability to incur indebtedness. As a result, we monitor our liquidity and capital resources, endeavor to anticipate potential covenant compliance issues and work with the lenders under our credit agreement to address those issues, if any, ahead of time.

As part of our plan to manage liquidity risks, we have lowered our capital expenditures budget, focused our drilling program on our highest return plays, and continue to explore opportunities to divest non-core assets and properties. As of February 12, 2016, we have sold approximately $37.4 million of non-core oil and gas properties in 2016 using the majority of the proceeds to pay down our borrowings under our bank credit agreement. If necessary, we could sell other non-core assets and use the proceeds to further reduce our outstanding borrowings.

The following is a summary of certain financial information for the years ended December 31:

	2015			2014			2013
	(In thousands)
Net cash provided by operating activities	$	446,944		$	708,993		$	674,331
Net cash used in investing activities	(549,778		)	(920,597		)	(579,180		)
Net cash provided by (used in) financing activities	102,620			194,060			(77,532		)
Net increase (decrease) in cash and cash equivalents	$	(214	)	$	(17,544	)	$	17,619

Cash flows from Operating Activities

Our operating cash flow is primarily influenced by the prices we receive for our oil, NGLs, and natural gas production, the quantity of oil, NGL, and natural gas we produce, settlements of derivative contracts, third-party demand for our drilling rigs and mid-stream services, and the rates we are able to charge for those services. Our cash flows from operating activities are also impacted by changes in working capital.

Net cash provided by operating activities during 2015 decreased by $262.0 million from 2014 due primarily to lower revenues due to lower commodity prices and lower drilling rig utilization partially offset by $29.0 million we recorded in early termination fees and by changes in operating assets and liabilities related to the timing of cash receipts and disbursements.

Cash flows from Investing Activities

We dedicate and expect to continue to dedicate a substantial portion of our capital expenditure program toward the exploration for and production of oil, NGLs, and natural gas. These capital expenditures are necessary to offset inherent declines in production, which is typical in the capital-intensive oil and natural gas industry.

Cash flows used in investing activities decreased by $370.8 million in 2015 compared to 2014. The change was due primarily to a decrease in capital expenditures partially offset by the proceeds received from the disposition of assets. See additional information on capital expenditures below under Capital Requirements.

Cash Flows from Financing Activities

Cash flows provided by financing activities decreased by $91.4 million in 2015 compared to 2014. This decrease was primarily due to our borrowings under our credit agreement as well as a decrease in our book overdrafts (which are checks that have been issued but not presented to our bank for payment before the end of the period).

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At December 31, 2015, we had unrestricted cash totaling $0.8 million and had borrowed $281.0 million of the $500.0 million we currently have available under our credit agreement. Our credit agreement is used primarily for working capital and capital expenditures.

The following is a summary of certain financial information as of December 31, and for the years ended December 31:

	2015				2014				2013
	(In thousands except percentages)
Working capital	$	(10,633	)		$	(51,680	)		$	(31,542	)
Long-term debt (1)	$	927,662			$	812,163			$	645,696
Shareholders’ equity	$	1,313,580		(2)	$	2,332,394		(2)	$	2,173,392
Net income (loss)	$	(1,037,361	)	(2)	$	136,276		(2)	$	184,746

_________________________

(1) Long-term debt is net of unamortized discount.

(2) In 2015 and 2014, we incurred non-cash ceiling test write-downs of our oil and natural gas properties of $1.6 billion and $76.7 million pre-tax ($1.0 billion and $47.7 million, net of tax), respectively. In December 2014, we incurred a non-cash write-down associated with the removal of 31 drilling rigs from our fleet along with certain other equipment and drill pipe of $74.3 million pre-tax ($46.3 million net of tax) and then an additional non-cash write-down in 2015 of $8.3 million pre-tax ($5.1 million, net of tax). Also in December 2014, we incurred a non-cash write-down associated with a reduction in the carrying value of three midstream segment systems of $7.1 million pre-tax ($4.4 million net of tax). Then in December 2015, we incurred a non-cash write-down associated with the reduction in the carrying value of three midstream segment gathering systems of $27.0 million pre-tax ($16.8 million, net of tax). The write-downs impacted our shareholders’ equity, ratio of long-term debt to total capitalization, and net income (loss) for years 2015 and 2014. There was no impact on our compliance with the covenants contained in our credit agreement.

Working Capital

Typically, our working capital balance fluctuates, in part, because of the timing of our trade accounts receivable and accounts payable and the fluctuation in current assets and liabilities associated with the mark to market value of our derivative activity. We had negative working capital of $10.6 million, $51.7 million, and $31.5 million as of December 31, 2015, 2014, and 2013, respectively. This is primarily from the timing of our accounts payable associated with our capital expenditures partially offset by lower accounts receivable due to lower revenues. Our credit agreement is used primarily for working capital and capital expenditures. At December 31, 2015, we had borrowed $281.0 million of the $500.0 million currently available to us under our credit agreement. The effect of our derivatives increased working capital by $10.2 million and $31.1 million as of December 31, 2015 and 2014, respectively, and decreased working capital by $5.0 million as of December 31, 2013.

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The following table summarizes certain operating information for the years ended December 31:

	2015		2014		2013
Oil and Natural Gas:
Oil production (MBbls)	3,783		3,844		3,360
Natural gas liquids production (MBbls)	5,274		4,628		3,914
Natural gas production (MMcf)	65,546		58,854		56,757
Average oil price per barrel received	$	50.79	$	89.43	$	95.06
Average oil price per barrel received excluding derivatives	$	45.04	$	89.32	$	95.18
Average NGLs price per barrel received	$	10.12	$	30.95	$	31.79
Average NGLs price per barrel received excluding derivatives	$	10.12	$	30.95	$	31.79
Average natural gas price per mcf received	$	2.63	$	3.92	$	3.32
Average natural gas price per mcf received excluding derivatives	$	2.25	$	4.03	$	3.33
Contract Drilling:
Average number of our drilling rigs in use during the period	34.7		75.4		65.0
Total number of drilling rigs available for use at the end of the period	94		89		121
Average dayrate	$	19,455	$	20,043	$	19,646
Mid-Stream:
Gas gathered—Mcf/day	353,771		319,348		309,554
Gas processed—Mcf/day	182,684		161,282		140,584
Gas liquids sold—gallons/day	577,513		733,406		543,602
Number of natural gas gathering systems	25		38		38
Number of processing plants	13		14		15

_________________________

(1) In 2015, our mid-stream segment transferred 11 natural gas gathering systems to our oil and natural gas segment.

Oil and Natural Gas Operations

Any significant change in oil, NGLs, or natural gas prices has a material effect on our revenues, cash flow, and the value of our oil, NGLs, and natural gas reserves. Generally, prices and demand for domestic natural gas are influenced by weather conditions, supply imbalances, and by worldwide oil price levels. Domestic oil prices are primarily influenced by world oil market developments. All of these factors are beyond our control and we cannot predict nor measure their future influence on the prices we will receive.

Based on our 2015 production, a $0.10 per Mcf change in what we are paid for our natural gas production, without the effect of derivatives, would result in a corresponding $520,000 per month ($6.2 million annualized) change in our pre-tax operating cash flow. Our 2015 average natural gas price was $2.63 compared to an average natural gas price of $3.92 for 2014 and $3.32 for 2013. A $1.00 per barrel change in our oil price, without the effect of derivatives, would have a $303,000 per month ($3.6 million annualized) change in our pre-tax operating cash flow and a $1.00 per barrel change in our NGLs prices, without the effect of derivatives, would have a $419,000 per month ($5.0 million annualized) change in our pre-tax operating cash flow based on our production in 2015. Our 2015 average oil price per barrel was $50.79 compared with an average oil price of $89.43 in 2014 and $95.06 in 2013, and our 2015 average NGLs price per barrel was $10.12 compared with an average NGLs price of $30.95 in 2014 and $31.79 in 2013.

Because commodity prices have an effect on the value of our oil, NGLs, and natural gas reserves, declines in those prices can result in a decline in the carrying value of our oil and natural gas properties. Price declines can also adversely affect the semi-annual determination of the amount available for us to borrow under our credit agreement since that determination is based mainly on the value of our oil, NGLs, and natural gas reserves. A reduction could limit our ability to carry out our planned capital projects. We expect to incur a non-cash ceiling test write-down in the first quarter of 2016. It is difficult to predict with reasonable certainty the amount of expected future impairments given the many factors impacting the ceiling test calculation including, but not limited to, future pricing, operating costs, drilling and completion costs, upward or downward reserve revisions, reserve additions, and tax attributes. Subject to these numerous factors and inherent limitations, holding these

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factors constant and only adjusting the 12-month average price to an estimated first quarter ending average (holding February 2016 prices constant for the remaining one month of 2016), we currently anticipate that we could recognize an impairment in the first quarter of 2016 of approximately $60 million pre-tax. The impact of the significantly higher commodity prices used in the ceiling test 12-month average price calculation will lessen as those higher prices will roll off from the calculation.

Our natural gas production is sold to intrastate and interstate pipelines, to independent marketing firms and gatherers under contracts with terms generally ranging anywhere from one month to five years. Our oil production is sold to independent marketing firms generally under six month contracts.

Contract Drilling Operations

Many factors influence the number of drilling rigs we are working at any given time as well as the costs and revenues associated with that work. These factors include the demand for drilling rigs in our areas of operation, competition from other drilling contractors, the prevailing prices for oil, NGLs, and natural gas, availability and cost of labor to run our drilling rigs, and our ability to supply the equipment needed.

Although our drilling rig personnel are a key component to the overall success of our drilling services, with the present conditions existing in the drilling industry, we do not anticipate increases in the compensation paid to those personnel in the near term.

During 2015, almost all of our working drilling rigs were drilling horizontal or directional wells for oil and NGLs. Today, the drastic reduction in commodity prices for oil and natural gas has changed demand for drilling rigs. All of these factors ultimately affect the demand and mix of the type of drilling rigs used by our customers. The future demand for and the availability of drilling rigs to meet that demand will have an impact on our future dayrates. For 2015, our average dayrate was $19,455 per day compared to $20,043 and $19,646 per day for 2014 and 2013, respectively. Our average number of drilling rigs used in 2015 was 34.7 (38%) compared with 75.4 (63%) and 65.0 (52%) in 2014 and 2013, respectively.Based on the average utilization of our drilling rigs during 2015, a $100 per day change in dayrates has a $3,470 per day ($1.3 million annualized) change in our pre-tax operating cash flow.

Our contract drilling segment provides drilling services for our exploration and production segment. Some of the drilling services we perform on our properties are, depending on the timing of those services, deemed to be associated with the acquisition of an ownership interest in the property. In those cases, revenues and expenses for those services are eliminated in our statement of operations, with any profit recognized as a reduction in our investment in our oil and natural gas properties. The contracts for these services are issued under the same conditions and rates as the contracts entered into with unrelated third parties. We eliminated revenue of $22.1 million, $89.5 million, and $64.3 million for 2015, 2014, and 2013, respectively, from our contract drilling segment and eliminated the associated operating expense of $18.3 million, $62.4 million, and $46.9 million during 2015, 2014, and 2013, respectively, yielding $3.8 million, $27.1 million, and $17.4 million during 2015, 2014, and 2013, respectively, as a reduction to the carrying value of our oil and natural gas properties.

In December 2014, we removed from service 31 drilling rigs, some older top drives, and certain drill pipe no longer marketable in the current environment and based on the estimated market value from third-party assessments, we recorded a write-down of approximately $74.3 million, pre-tax. During the first quarter of 2015, we sold one of these drilling rigs to an unaffiliated third party. The proceeds of this sale, less costs to sell, exceeded the $0.3 million net book value of the drilling rig resulting in a gain of $7,900. During the second quarter, we recorded an additional write-down on the remaining drilling rigs and other equipment of approximately $8.3 million pre-tax based on the estimated market value from similar auctions. During the third quarter, we sold the remaining 30 drilling rigs and most of the equipment in an auction. The proceeds from the sale of those assets, less costs to sell, was less than the $11.0 million net book value resulting in a loss of $7.3 million pre-tax. Some of the equipment that was not sold at the auction will be sold within the next twelve months and remain classified as assets held for sale. The net book value of those assets is $0.6 million.

Mid-Stream Operations

This segment is engaged primarily in the buying, selling, gathering, processing, and treating of natural gas. It operates three natural gas treatment plants, 13 processing plants, 25 gathering systems, and approximately 1,464 miles of pipeline. Its operations are located in Oklahoma, Texas, Kansas, Pennsylvania, and West Virginia. This segment enhances our ability to gather and market not only our own natural gas and NGLs but also that owned by third parties and serves as a mechanism through which we can construct or acquire existing natural gas gathering and processing facilities. During 2015, 2014, and 2013 this segment purchased $57.6 million, $80.9 million, and $83.0 million, respectively, of our oil and natural gas segment's

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natural gas and NGLs production, and provided gathering and transportation services of $7.6 million, $8.7 million, and $8.0 million, respectively. Intercompany revenue from services and purchases of production between this business segment and our oil and natural gas segment has been eliminated in our consolidated financial statements.

Our mid-stream segment gathered an average of 353,771 Mcf per day in 2015 compared to 319,348 Mcf per day in 2014 and 309,554 Mcf per day in 2013. It processed an average of 182,684 Mcf per day in 2015 compared to 161,282 Mcf per day in 2014 and 140,584 Mcf per day in 2013, and sold NGLs of 577,513 gallons per day in 2015 compared to 733,406 gallons per day in 2014 and 543,602 gallons per day in 2013. Gas gathering volumes per day in 2015 increased primarily from new wells connected to our systems between the comparative periods. Volumes processed increased primarily due to new wells connected. NGLs sold decreased primarily from being in ethane rejection mode.

Our Credit Agreement and Senior Subordinated Notes

Credit Agreement. On April 10, 2015, we amended our Senior Credit Agreement (credit agreement) to extend the maturity date from September 13, 2016 to April 10, 2020.The amount we can borrow is the lesser of the amount we elect (from time to time) as the commitment amount or the value of the borrowing base as determined by the lenders, but in either event not to exceed the maximum credit agreement amount of $900.0 million. Our current commitment amount is $500.0 million. Our current borrowing base is $550.0 million. We are charged a commitment fee ranging from 0.375% to 0.50% on the amount available but not borrowed. The fee varies based on the amount borrowed as a percentage of the amount of the total borrowing base. To date, for this new amendment, we paid $2.6 million in origination, agency, syndication, and other related fees. We are amortizing these fees over the life of the credit agreement.

The current lenders under our credit agreement and their respective participation interests are as follows:

Lender	Participation Interest
BOK (BOKF, NA, dba Bank of Oklahoma)	17	%
Compass Bank	17	%
BMO Harris Financing, Inc.	15	%
Bank of America, N.A.	15	%
Comerica Bank	8	%
Wells Fargo Bank, N.A.	8	%
Canadian Imperial Bank of Commerce	8	%
Toronto Dominion (New York), LLC	8	%
The Bank of Nova Scotia	4	%
	100	%

The amount of the borrowing base–which is subject to redetermination by the lenders on April 1st and October 1st of each year, is based primarily on a percentage of the discounted future value of our oil and natural gas reserves. Effective with the October 2015 redetermination, the lenders under our credit agreement decreased our borrowing base from $725.0 million to $550.0 million. We or the lenders may request a onetime special redetermination of the borrowing base between each scheduled redetermination. In addition, we may request a redetermination following the completion of an acquisition that meets the requirements set forth in the credit agreement. While it is anticipated deteriorating commodity prices may result in a reduction to our current borrowing base, we believe our liquidity will be adequate to carry out our 2016 capital plans.

At our election, any part of the outstanding debt under the credit agreement may be fixed at a London Interbank Offered Rate (LIBOR). LIBOR interest is computed as the sum of the LIBOR base for the applicable term plus 1.75% to 2.50% depending on the level of debt as a percentage of the borrowing base and is payable at the end of each term, or every 90 days, whichever is less. Borrowings not under LIBOR bear interest at the prime rate specified in the credit agreement that in any event cannot be less than LIBOR plus 1.00%. Interest is payable at the end of each month and the principal may be repaid in whole or in part at anytime, without a premium or penalty. At December 31, 2015 and February 12, 2016, we had $281.0 million and $262.9 million, respectively, outstanding borrowings under our credit agreement.

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We can use borrowings for financing general working capital requirements for (a) exploration, development, production and acquisition of oil and gas properties, (b) acquisitions and operation of mid-stream assets, (c) issuance of standby letters of credit, (d) contract drilling services, and (e) general corporate purposes.

The credit agreement prohibits, among other things:

• the payment of dividends (other than stock dividends) during any fiscal year in excess of 30% of our consolidated net income for the preceding fiscal year;

• the incurrence of additional debt with certain limited exceptions; and

• the creation or existence of mortgages or liens, other than those in the ordinary course of business, on any of our properties, except in favor of our lenders.

The credit agreement also requires that we have at the end of each quarter:

• a current ratio (as defined in the credit agreement) of not less than 1 to 1; and

• a leverage ratio of funded debt to consolidated EBITDA (as defined in the credit agreement) for the most recently ended rolling four fiscal quarters of no greater than 4 to 1.

As of December 31, 2015, we were in compliance with the covenants contained in the credit agreement.

6.625% Senior Subordinated Notes. We have an aggregate principal amount of $650.0 million, 6.625% senior subordinated notes (the Notes). Interest on the Notes is payable semi-annually (in arrears) on May 15 and November 15 of each year. The Notes will mature on May 15, 2021. In connection with the issuance of the Notes, we incurred $14.7 million of fees that are being amortized as debt issuance cost over the life of the Notes.

The Notes are subject to an Indenture dated as of May 18, 2011, between us and Wilmington Trust, National Association (successor to Wilmington Trust FSB), as Trustee (the Trustee), as supplemented by the First Supplemental Indenture dated as of May 18, 2011, between us, the Guarantors, and the Trustee, and as further supplemented by the Second Supplemental Indenture dated as of January 7, 2013, between us, the Guarantors and the Trustee (as supplemented, the 2011 Indenture), establishing the terms and providing for the issuance of the Notes. The Guarantors are all of our direct and indirect subsidiaries. The discussion of the Notes in this report is qualified by and subject to the actual terms of the 2011 Indenture.

Unit, as the parent company, has no independent assets or operations. The guarantees by the Guarantors of the Notes (registered under registration statements) are full and unconditional, joint and several, subject to certain automatic customary releases, are subject to certain restrictions on the sale, disposition, or transfer of the capital stock or substantially all of the assets of a subsidiary guarantor, and other conditions and terms set out in the Indenture. Any of our subsidiaries that are not Guarantors are minor. There are no significant restrictions on our ability to receive funds from our subsidiaries through dividends, loans, advances or otherwise.

At any time before May 15, 2016, we may redeem the Notes, in whole or in part, at a redemption price equal to 100% of the principal amount plus a “make whole” premium, plus accrued and unpaid interest, if any, to the redemption date. On and after May 15, 2016, we may redeem all or, from time to time, a part of the Notes at certain redemption prices, plus accrued and unpaid interest. If a “change of control” occurs, subject to certain conditions, we must offer to repurchase from each holder all or any part of that holder’s Notes at a purchase price in cash equal to 101% of the principal amount of the Notes plus accrued and unpaid interest, if any, to the date of purchase. The 2011 Indenture contains customary events of default. The 2011 Indenture also contains covenants that, among other things, limit our ability and the ability of certain of our subsidiaries to incur or guarantee additional indebtedness; pay dividends on our capital stock or redeem capital stock or subordinated indebtedness; transfer or sell assets; make investments; incur liens; enter into transactions with our affiliates; and merge or consolidate with other companies. We were in compliance with all covenants of the Notes as of December 31, 2015.

Capital Requirements

Oil and Natural Gas Dispositions, Acquisitions, and Capital Expenditures. Most of our capital expenditures for this segment are discretionary and directed toward future growth. Any decision to increase our oil, NGLs, and natural gas reserves through acquisitions or through drilling depends on the prevailing or expected market conditions, potential return on investment, future drilling potential, and opportunities to obtain financing under the circumstances involved, all of which

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provide us with a large degree of flexibility in deciding when and if to incur these costs. We completed drilling 58 gross wells (34.99 net wells) in 2015 compared to 186 gross wells (121.00 net wells) in 2014, and 149 gross wells (91.14 net wells) in

2013. Our 2015 total capital expenditures for our oil and natural gas segment, excluding a $5.7 million reduction in the ARO liability and $0.2 million in acquisitions, totaled $273.5 million compared to 2014 capital expenditures of $772.2 million (excluding a $37.7 million reduction in the ARO liability and $5.7 million in acquisitions), and 2013 capital expenditures of $549.2 million (excluding an $18.0 million reduction in the ARO liability).

For all of 2016, we plan to participate in drilling approximately 15 to 25 gross wells and estimate our total capital expenditures (excluding any possible acquisitions) for our oil and natural gas segment will be a range of approximately $109.0 million to $131.0 million. Whether we are able to drill all of those wells is dependent on a number of factors, many of which are beyond our control and include the availability of drilling rigs, availability of pressure pumping services, prices for oil, NGLs, and natural gas, demand for oil, NGLs, and natural gas, the cost to drill wells, the weather, and the efforts of outside industry partners.

In August 2013, we sold some Bakken property interests. The proceeds, net of related expenses, were $57.1 million. In addition, we had other non-core asset sales with proceeds, net of related expenses, of $21.7 million for 2013. Proceeds from these dispositions reduced the net book value of the full cost pool with no gain or loss recognized. We sold non-core oil and natural gas assets, net of related expenses, for $1.9 million and $33.1 million during 2015 and 2014, respectively. Proceeds from those dispositions reduced the net book value of our full cost pool with no gain or loss recognized. As of February 12, 2016, we have sold approximately $37.4 million of non-core oil and gas properties in 2016 using the majority of the proceeds to pay down our borrowings under our bank credit agreement.

Contract Drilling Dispositions, Acquisitions, and Capital Expenditures. During 2013, we sold four of our 2,000 horsepower electric drilling rigs and one 3,000 horsepower electric drilling rigs. All of these sales were to unaffiliated third-parties.

During the first quarter of 2014. we sold four additional idle 3,000 horsepower drilling rigs to an unaffiliated third party. The proceeds from that sale were used in our construction program for our new proprietary 1,500 horsepower, AC electric drilling rig, called the BOSS drilling rig.

During 2014, three BOSS drilling rigs were constructed and placed into service for third-party operators.

In December 2014, we removed from service 31 drilling rigs, some older top drives, and certain drill pipe no longer marketable in the current environment and based on the estimated market value from third-party assessments, we recorded a write-down of approximately $74.3 million, pre-tax. During the first quarter of 2015, we sold one of these drilling rigs to an unaffiliated third party. The proceeds of this sale, less costs to sell, exceeded the $0.3 million net book value of the drilling rig resulting in a gain of $7,900. During the second quarter, we recorded an additional write-down on the remaining drilling rigs and other equipment of approximately $8.3 million pre-tax based on the estimated market value from similar auctions. During the third quarter, we sold the remaining 30 drilling rigs and most of the equipment in an auction. The proceeds from the sale of those assets, less costs to sell, was less than the $11.0 million net book value resulting in a loss of $7.3 million pre-tax. Some of the equipment that was not sold at the auction will be sold within the next twelve months and remain classified as assets held for sale. The net book value of those assets is $0.6 million.

During the first half of 2015, five BOSS drilling rigs were constructed and placed into service for third-party operators. The long lead time components for three additional BOSS drilling rigs were ordered in 2014 in anticipation for future demand of the BOSS drilling rigs. However, with the decline in the drilling market, many of these long lead time components were either postponed for later delivery or canceled altogether. Currently, we do not have any contracts to build new BOSS drilling rigs.

Our anticipated 2016 capital expenditures for this segment range from $9.0 million to $11.0 million. We have spent $84.8 million for capital expenditures during 2015 compared to $176.7 million in 2014, and $64.3 million in 2013.

Mid-Stream Dispositions, Acquisitions, and Capital Expenditures. At our Hemphill Texas system with the completion of the nine-mile pipeline that connects our Buffalo Wallow gathering system to our Hemphill processing facility, we began transporting Buffalo Wallow gathered gas to our Hemphill facility for processing. At our Hemphill processing facility, we have three operational processing skids that provide approximately 135 MMcf per day of processing capacity.

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In central Oklahoma at our Perkins processing facility, we completed the upgrade of our processing facility which increased our total processing capacity from 20 MMcf per day to 27 MMcf per day. These improvements consist of processing

plant upgrades along with projects to improve recoveries at this facility. During 2015, we connected 11 new wells to this system from several producers.

Also in central Oklahoma, at our Minco processing facility, we completed upgrades to this facility which improved our processing capacity and allowed us to gather and process additional liquid rich gas from third-party producers. With this upgrade the total processing capacity of this system was increased to approximately 15 MMcf per day.

In the Mississippian play in north central Oklahoma, we completed the upgrade of our Bellmon gathering system along with the installation of additional compressors. This will allow us to receive additional volume from third-party producers in the area. We connected 40 new wells to this system from several producers during 2015. At this processing facility we have two operational processing skids that provide total processing capacity of approximately 90 MMcf per day.

In the Appalachian region, we completed the northern expansion of the Pittsburgh Mills gathering system into Butler County, Pennsylvania. This project includes a seven-mile trunkline along with a related compressor station. With the completion of this project we also gain an additional outlet for our gas into NiSource pipeline. The Clinton compressor station located in Butler County, Pennsylvania was completed and became operational in the fourth quarter of 2015. With the completion of this expansion project, we now have the ability to connect additional wells that are scheduled to be drilled in this area in 2016.

Also in the Appalachian area, we completed the construction of our new fee-based gathering system, Snow Shoe Gathering System, in Centre County, Pennsylvania. This system consists of approximately 12 miles of gathering pipeline. The pipeline has been installed and is now operational. We began flowing gas on this pipeline in January 2016.

During 2015, our mid-stream segment incurred $63.5 million in capital expenditures as compared to $51.1 million, excluding $28.2 million for capital leases, in 2014, and $96.1 million in 2013. For 2016, our estimated capital expenditures range from $22.0 million to $24.0 million.

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Contractual Commitments

At December 31, 2015, we had the following contractual obligations:

	Payments Due by Period
	Total		Less Than 1 Year		2-3 Years		4-5 Years		After 5 Years
	(In thousands)
Long-term debt (1)	$	1,193,206	$	50,304	$	100,609	$	376,366	$	665,927
Operating leases (2)	8,311		6,407		1,740		164		—
Capital lease interest and maintenance (3)	12,143		2,619		4,799		4,173		552
Drill pipe, drilling components, and equipment purchases (4)	6,749		6,699		—		50		—
Enterprise Resource Planning software obligations (5)	1,911		1,425		486		—		—
Total contractual obligations	$	1,222,320	$	67,454	$	107,634	$	380,753	$	666,479

_________________________ 

(1) See previous discussion in MD&A regarding our long-term debt. This obligation is presented in accordance with the terms of the Notes and credit agreement and includes interest calculated using our December 31, 2015 interest rates of 6.625% for the Notes and 2.6% for the credit agreement.

(2) We lease office space or yards in Edmond, Oklahoma City, and Tulsa, Oklahoma; Houston, Texas; Englewood, Colorado; Pinedale, Wyoming; and Pittsburgh, Pennsylvania under the terms of operating leases expiring through December 2021. Additionally, we have several equipment leases and lease space on short-term commitments to stack excess drilling rig equipment and production inventory.

(3) Maintenance and interest payments are included in our capital lease agreements. The capital leases are discounted using annual rates of 4.0%. Total maintenance and interest remaining are $9.4 million and $2.7 million, respectively.

(4) We have committed to purchase approximately $6.7 million of new drilling rig components, drill pipe, and related equipment over the next twelve months.

(5) We have committed to pay $1.4 million for Enterprise Resource Planning software and $0.5 million for maintenance for one year following implementation.

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At December 31, 2015, we also had the following commitments and contingencies that could create, increase or accelerate our liabilities:

	Estimated Amount of Commitment Expiration Per Period
Other Commitments	Total Accrued		Less Than 1 Year		2-3 Years		4-5 Years		After 5 Years
	(In thousands)
Deferred compensation plan (1)	$	4,244	Unknown		Unknown		Unknown		Unknown
Separation benefit plans (2)	$	9,886	$	1,436	Unknown		Unknown		Unknown
ARO liability (3)	$	98,297	$	3,965	$	55,407	$	9,225	$	29,700
Gas balancing liability (4)	$	5,047	Unknown		Unknown		Unknown		Unknown
Repurchase obligations (5)	$	—	Unknown		Unknown		Unknown		Unknown
Workers’ compensation liability (6)	$	16,551	$	7,610	$	2,233	$	1,115	$	5,593
Capital lease obligations (7)	$	22,466	$	3,549	$	7,538	$	8,163	$	3,216
Derivative liabilities—commodity hedges	$	285	$	—	$	285	$	—	$	—
Other	$	410	$	—	$	410	$	—	$	—

_________________________ 

(1) We provide a salary deferral plan which allows participants to defer the recognition of salary for income tax purposes until actual distribution of benefits, which occurs at either termination of employment, death or certain defined unforeseeable emergency hardships. We recognize payroll expense and record a liability, included in other long-term liabilities in our Consolidated Balance Sheets, at the time of deferral.

(2) Effective January 1, 1997, we adopted a separation benefit plan (Separation Plan). The Separation Plan allows eligible employees whose employment with us is involuntarily terminated or, in the case of an employee who has completed 20 years of service, voluntarily or involuntarily terminated, to receive benefits equivalent to four weeks salary for every whole year of service completed with the company up to a maximum of 104 weeks. To receive payments the recipient must waive certain claims against us in exchange for receiving the separation benefits. On October 28, 1997, we adopted a Separation Benefit Plan for Senior Management (Senior Plan). The Senior Plan provides certain officers and key executives of the company with benefits generally equivalent to the Separation Plan. The Compensation Committee of the Board of Directors has absolute discretion in the selection of the individuals covered in this plan. On May 5, 2004 we also adopted the Special Separation Benefit Plan (Special Plan). This plan is identical to the Separation Benefit Plan with the exception that the benefits under the plan vest on the earliest of a participant’s reaching the age of 65 or serving 20 years with the company. On December 31, 2008, all these plans were amended to bring the plans into compliance with Section 409A of the Internal Revenue Code of 1986, as amended. On December 8, 2015, we amended the Plans to change the calculation for determining the payouts at the time of a Separation of Service under the Plans.

(3) When a well is drilled or acquired, under ASC 410 “Accounting for Asset Retirement Obligations,” we record the fair value of liabilities associated with the retirement of long-lived assets (mainly plugging and abandonment costs for our depleted wells).

(4) We have recorded a liability for those properties we believe do not have sufficient oil, NGLs, and natural gas reserves to allow the under-produced owners to recover their under-production from future production volumes.

(5) We formed The Unit 1984 Oil and Gas Limited Partnership and the 1986 Energy Income Limited Partnership along with private limited partnerships (the Partnerships) with certain qualified employees, officers and directors from 1984 through 2011, with a subsidiary of ours serving as general partner. Effective December 31, 2014, The Unit 1984 Oil and Gas Limited Partnership dissolved. The Partnerships were formed for the purpose of conducting oil and natural gas acquisition, drilling and development operations and serving as co-general partner with us in any additional limited partnerships formed during that year. The Partnerships participated on a proportionate basis with us in most drilling operations and most producing property acquisitions commenced by us for our own account during the period from the formation of the Partnership through December 31 of that year. These partnership agreements require, on the election of a limited partner, that we repurchase the limited partner’s interest at amounts to be determined by appraisal in the future. Repurchases in any one year are limited to 20% of the units outstanding. We made repurchases of $118,000, $45,000, and $16,000 in 2015, 2014, and 2013, respectively.

(6) We have recorded a liability for future estimated payments related to workers’ compensation claims primarily associated with our contract drilling segment.

(7) This amount includes commitments under capital lease arrangements for compressors in our mid-stream segment.

Derivative Activities

Periodically we enter into derivative transactions locking in the prices to be received for a portion of our oil, NGLs, and natural gas production. In August 2012, we determined–on a prospective basis–that we would no longer elect to use cash flow hedge accounting for our economic hedges. All of our previous cash flow hedges expired as of December 31, 2013. Any change in fair value on all commodity derivatives we have entered into are reflected in the statement of operations and not in accumulated other comprehensive income.

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Commodity Derivatives. Our commodity derivatives is intended to reduce our exposure to price volatility and manage price risks. Our decision on the type and quantity of our production and the price(s) of our derivative(s) is based, in part, on our view of current and future market conditions. As of December 31, 2015, based on our fourth quarter 2015 average daily production, the approximated percentages of our production under derivative contracts are as follows:

	Mark-to-Market
	2016		2017
Daily oil production	33	%	9	%
Daily natural gas production	52	%	9	%

With respect to the commodities subject to derivative contracts, those contracts serve to limit the risk of adverse downward price movements. However, they also limit increases in future revenues that would otherwise result from price movements above the contracted prices.

The use of derivative transactions carries with it the risk that the counterparties may not be able to meet their financial obligations under the transactions. Based on our evaluation at December 31, 2015, we believe the risk of non-performance by our counterparties is not material. At December 31, 2015, the fair values of the net assets we had with each of the counterparties to our commodity derivative transactions are as follows:

	December 31, 2015
	(In millions)
Canadian Imperial Bank of Commerce	$	8.7
Bank of Montreal	1.1
Scotiabank	0.7
Bank of America Merrill Lynch	0.4
Total assets	$	10.9

If a legal right of set-off exists, we net the value of the derivative arrangements we have with the same counterparty in our Consolidated Balance Sheets. At December 31, 2015, we recorded the fair value of our commodity derivatives on our balance sheet as current and non-current derivative assets of $10.2 million and $1.0 million, respectively, and non-current derivative liabilities of $0.3 million. At December 31, 2014, we recorded the fair value of our commodity derivatives on our balance sheet as current derivative assets of $31.1 million.

For our economic hedges that we did not apply cash flow accounting to, any changes in their fair value occurring before their maturity (i.e., temporary fluctuations in value) are reported in gain (loss) on derivatives not designated as hedges and hedge ineffectiveness, net in our Consolidated Statements of Operations. The commodity derivative instruments we had under cash flow accounting expired as of December 2013. Previous changes in the fair value of derivatives designated as cash flow hedges, to the extent they were effective in offsetting cash flows attributable to the hedged risk, were recorded in OCI until the hedged item was recognized into earnings. When the hedged item was recognized into earnings, it was reported in oil and natural gas revenues. Any change in fair value resulting from ineffectiveness was recognized in gain (loss) on derivatives not designated as hedges and hedge ineffectiveness, net.

These gains (losses) are as follows at December 31:

	2015		2014		2013
	(In thousands)
Gain (loss) on derivatives not designated as hedges and hedge ineffectiveness, net
Gain (loss) on derivatives not designated as hedges, included are amounts settled during the period of $46,615, ($6,038), and ($1,764), respectively	$	26,345	$	30,147	$	(8,184	)
Gain (loss) on ineffectiveness of cash flow hedges	—		—		(190		)
	$	26,345	$	30,147	$	(8,374	)

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Stock and Incentive Compensation

During 2015, we granted awards covering 750,290 shares of restricted stock. These awards were granted as retention incentive awards. These stock awards had an estimated fair value as of the grant date of $24.5 million. Compensation expense will be recognized over the awards' three year vesting period. During 2015, we recognized $7.9 million in additional compensation expense and capitalized $1.9 million for these awards. During 2014, we granted awards covering 468,890 shares of restricted stock. These awards were granted as retention incentive awards and are being recognized over the awards' three year vesting period. During 2013, we granted awards covering 474,677 shares of restricted stock. These awards were granted as retention incentive awards and are being recognized over their two and three year vesting periods. No SAR awards were made during 2015, 2014, or 2013.

During 2015, we recognized compensation expense of $15.3 million for our restricted stock grants and capitalized $3.5 million of compensation cost for oil and natural gas properties. Recognized compensation expense and capitalized stock compensation cost for oil and natural gas properties were reduced $3.2 million and $0.2 million, respectively, for adjustments made related to the performance shares.

Insurance

We are self-insured for certain losses relating to workers’ compensation, control of well, and employee medical benefits. Insured policies for other coverages contain deductibles or retentions per occurrence that range from zero to $1.0 million. We have purchased stop-loss coverage in order to limit, to the extent feasible, per occurrence and aggregate exposure to certain types of claims. However, there is no assurance that the insurance coverages we have will adequately protect us against liability from all potential consequences. Unit Texas Drilling, L.L.C. was merged into its parent company, Unit Drilling Company, effective October 31, 2015, at which time the ERISA governed occupational injury benefit program was closed. All new claims after this date are processed under an existing insured workers’ compensation program. If insurance coverage becomes more expensive, we may choose to self-insure, decrease our limits, raise our deductibles, or any combination of these rather than pay higher premiums.

Oil and Natural Gas Limited Partnerships and Other Entity Relationships.

We are the general partner of 15 oil and natural gas partnerships which were formed privately or publicly. Each partnership’s revenues and costs are shared under formulas set out in that partnership’s agreement. The partnerships repay us for contract drilling, well supervision and general and administrative expense. Related party transactions for contract drilling and well supervision fees are the related party’s share of such costs. These costs are billed on the same basis as billings to unrelated third parties for similar services. General and administrative reimbursements consist of direct general and administrative expense incurred on the related party’s behalf as well as indirect expenses assigned to the related parties. Allocations are based on the related party’s level of activity and are considered by us to be reasonable. During 2015, 2014, and 2013, the total we received for all of these fees was $0.4 million, $0.5 million, and $0.5 million, respectively. Our proportionate share of assets, liabilities, and net income relating to the oil and natural gas partnerships is included in our consolidated financial statements.

Effects of Inflation

The effect of inflation in the oil and natural gas industry is primarily driven by the prices for oil, NGLs, and natural gas. Increases in these prices increase the demand for our contract drilling rigs and services. This increase in demand in turn affects the dayrates we can obtain for our contract drilling services. During periods of higher demand for our drilling rigs we have experienced increases in labor costs as well as the costs of services to support our drilling rigs. Historically, during this same period, when oil, NGLs, and natural gas prices did decline, labor rates did not come back down to the levels existing before the increases. If commodity prices increase substantially for a long period, shortages in support equipment (such as drill pipe, third party services, and qualified labor) can result in additional increases in our material and labor costs. Increases in dayrates for drilling rigs also increase the cost of our oil and natural gas properties. How inflation will affect us in the future will depend on increases, if any, realized in our drilling rig rates, the prices we receive for our oil, NGLs, and natural gas, and the rates we receive for gathering and processing natural gas.

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Off-Balance Sheet Arrangements

We do not currently utilize any off-balance sheet arrangements with unconsolidated entities to enhance liquidity and capital resource positions, or for any other purpose. However, as is customary in the oil and gas industry, we are subject to various contractual commitments.

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Results of Operations

2015 versus 2014

	2015			2014			Percent Change (1)
	(In thousands unless otherwise specified)
Total operating revenue	$	854,231		$	1,572,944		(46	)%
Net income (loss)	$	(1,037,361	)	$	136,276		NM
Oil and Natural Gas:
Revenue	$	385,774		$	740,079		(48	)%
Operating costs excluding depreciation, depletion, amortization, and impairment	$	166,046		$	187,916		(12	)%
Depreciation, depletion, and amortization	$	251,944		$	276,088		(9	)%
Impairment of oil and gas properties	$	1,599,348		$	76,683		NM
Average oil price received (Bbl)	$	50.79		$	89.43		(43	)%
Average NGL price received (Bbl)	$	10.12		$	30.95		(67	)%
Average natural gas price received (Mcf)	$	2.63		$	3.92		(33	)%
Oil production (Bbl)	3,783,000			3,844,000			(2	)%
NGLs production (Bbl)	5,274,000			4,628,000			14	%
Natural gas production (Mcf)	65,546,000			58,854,000			11	%
Depreciation, depletion, and amortization rate (Boe)	$	12.30		$	14.82		(17	)%
Contract Drilling:
Revenue	$	265,668		$	476,517		(44	)%
Operating costs excluding depreciation and impairment	$	156,408		$	274,933		(43	)%
Depreciation	$	56,135		$	85,370		(34	)%
Impairment of contract drilling equipment	$	8,314		$	74,318		(89	)%
Percentage of revenue from daywork contracts	100		%	100		%
Average number of drilling rigs in use	34.7			75.4			(54	)%
Average dayrate on daywork contracts	$	19,455		$	20,043		(3	)%
Mid-Stream:
Revenue	$	202,789		$	356,348		(43	)%
Operating costs excluding depreciation, amortization, and impairment	$	161,556		$	306,831		(47	)%
Depreciation and amortization	$	43,676		$	40,434		8	%
Impairment of gas gathering and processing systems	$	26,966		$	7,068		NM
Gas gathered—Mcf/day	353,771			319,348			11	%
Gas processed—Mcf/day	182,684			161,282			13	%
Gas liquids sold—gallons/day	577,513			733,406			(21	)%
Corporate and other:
General and administrative expense	$	35,345		$	42,023		(16	)%
Gain (loss) on disposition of assets	$	(7,229	)	$	8,953		(181	)%
Other income (expense):
Interest expense, net	$	(31,963	)	$	(17,371	)	84	%
Gain on derivatives not designated as hedges and hedge ineffectiveness, net	$	26,345		$	30,147		(13	)%
Other	$	45		$	(70	)	164	%
Income tax expense (benefit)	$	(626,948	)	$	86,663		NM
Average interest rate	5.4		%	6.5		%	(17	)%
Average long-term debt outstanding	$	897,391		$	674,832		33	%

_________________________

(1) NM – A percentage calculation is not meaningful due to a zero-value denominator or a percentage change greater than 200.

65

Oil and Natural Gas

Oil and natural gas revenues decreased $354.3 million or 48% in 2015 as compared to 2014 due primarily to lower oil, natural gas, and NGLs prices partially offset by an increase in production. Oil production decreased 2%, NGLs production increased 14%, and natural gas production increased 11%. Average oil prices between the comparative years decreased 43% to $50.79 per barrel, NGLs prices decreased 67% to $10.12 per barrel, and natural gas prices decreased 33% to $2.63 per Mcf.

Oil and natural gas operating costs decreased $21.9 million or 12% between the comparative years of 2015 and 2014 due to lower gross production taxes due to lower sales revenue and lower general and administrative expense.

Depreciation, depletion, and amortization (DD&A) decreased $24.1 million or 9% primarily due to a 17% decrease in our DD&A rate partially offset by the effect of a 9% increase in equivalent production. The decrease in our DD&A rate in 2015 compared to 2014 resulted primarily from the effect of the ceiling test write-downs during 2015. Our DD&A expense on our oil and natural properties is calculated each quarter utilizing period end reserve quantities adjusted for current period production.

During 2015, we recorded non-cash ceiling test write-downs of our oil and natural gas properties totaling $1.6 billion pre-tax ($1.0 billion, net of tax) compared to a non-cash ceiling test write-down of our oil and natural gas properties of $76.7 million pre-tax ($47.7 million net of tax) in December of 2014. These write-downs were due to the inclusion of the impaired value of the unproved properties of $114.4 million and $73.7 million in 2015 and 2014, respectively and a reduction of the 12-month average commodity prices during each year.

Contract Drilling

Drilling revenues decreased $210.8 million or 44% in 2015 as compared to 2014. The decrease was due primarily to a 54% decrease in the average number of drilling rigs in use and a 3% decrease in the average dayrate partially offset by $29.0 million for fees on contracts terminated early in 2015. Average drilling rig utilization decreased from 75.4 drilling rigs in 2014 to 34.7 drilling rigs in 2015.

Drilling operating costs decreased $118.5 million or 43% in 2015 compared to 2014. The decrease was due primarily to fewer drilling rigs operating. Contract drilling depreciation decreased $29.2 million or 34% also due primarily to fewer drilling rigs operating. In December 2014, 31 drilling rigs and other drilling equipment were written down to their estimated market value. This impairment was approximately $74.3 million pre-tax. During the second quarter of 2015, we recorded an additional impairment of approximately $8.3 million on the drilling rigs and other equipment that was sold at auction during the third quarter.

Several of our drilling rig customers have continued to significantly reduce their drilling budgets for 2016, resulting in a significant reduction in the average utilization of our drilling fleet mix. At December 31, 2015, we had 26 drilling rigs operating, at February 12, 2016, this number has been reduced to 20 drilling rigs operating.

Mid-Stream

Our mid-stream revenues decreased $153.6 million or 43% in 2015 as compared to 2014 due primarily from the average price for NGLs sold decreasing 47%, the average price for natural gas sold decreasing 39%, and NGLs volumes sold per day decreasing 21% primarily from being in ethane rejection mode. Gas processing volumes per day increased 13% between the comparative years primarily from new well connections. Gas gathering volumes per day increased 11% primarily from new well connections.

Operating costs decreased $145.3 million or 47% in 2015 compared to 2014 primarily due to an 54% decrease in prices paid for natural gas purchased partially offset by a 12% increase in purchase volumes. Depreciation and amortization increased $3.2 million or 8% primarily due to capital expenditures for upgrades and well connects.

In December 2014, our mid-stream segment had a $7.1 million pre-tax write-down of three of its systems, Weatherford, Billy Rose, and Spring Creek due to anticipated future cash flow and future development around these systems supporting their carrying value. The estimated future cash flows were less than the carrying value on these systems. In December 2015, our mid-stream segment had another $27.0 million pre-tax write-down of three of its systems, Bruceton Mills, Midwell, and Spring Creek due to anticipated future cash flow and future development around these systems not being sufficient to support their carrying value. The estimated future cash flows were less than the carrying value on these systems.

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Due to the decline in NGLs prices beginning in 2014, we operated our processing facilities in full ethane rejection mode which reduced the amount of liquids sold throughout 2015. As long as NGLs prices continue at or below these levels,we expect to continue operating in full ethane rejection mode. Our mid-stream segment did not experience a reduction in processed volumes in 2015 but as low prices continue we expect further reductions in drilling activity around our systems which will eventually effect our ability to connect new wells resulting in lower processed volumes in the future.

General and Administrative

General and administrative expenses decreased $6.7 million or 16% in 2015 compared to 2014 primarily due to lower employee costs and a $1.8 million decrease in the stock-based compensation accrual due to an evaluation of the performance based shares component of previous grants.

Gain (loss) on Disposition of Assets

Gain (loss) on disposition of assets decreased $16.2 million in 2015 compared to 2014 primarily due to the loss of $7.3 million pre-tax on the sale of 30 drilling rigs and other drilling equipment in an auction somewhat offset by the gains on the sale of one gathering system, various drilling rig components, vehicles, and a drilling rig during 2015, compared to a gain of $9.0 million primarily for the sale of four idle 3,000 horsepower drilling rigs to an unaffiliated third-party during 2014.

Other Income (Expense)

Interest expense, net of capitalized interest, increased $14.6 million between the comparative years of 2015 and 2014. We capitalized interest based on the net book value associated with unproved properties not being amortized, the construction of additional drilling rigs, and the construction of gas gathering systems. Capitalized interest for 2015 was $21.7 million compared to $32.2 million in 2014, and was netted against our gross interest of $53.7 million and $49.6 million for 2015 and 2014, respectively. Our average interest rate decreased from 6.5% to 5.4% and our average debt outstanding was $222.6 millionhigher in 2015 as compared to 2014 primarily due to the increase in our outstanding borrowings under our credit agreement over the comparative periods.

Gain on derivatives not designated as hedges decreased from a gain of $30.1 million in 2014 to a gain of $26.3 million in 2015 primarily due to fluctuations in forward prices used to estimate the fair value in mark-to-market accounting.

Income Tax Expense

Income tax expense decreased $713.6 million in 2015 compared to 2014 primarily due to decreased income due to the impairments in all three segments during 2015. Our effective tax rate was 37.7% for 2015 and 38.9% for 2014. This decrease is primarily due to the effect of permanent differences as they relate to negative pre-tax income. Current income tax benefit was $20.6 million in 2015 compared to a current income tax expense of $9.4 million for 2014. The $20.6 million current income tax benefit is due to an anticipated alternative minimum tax (AMT) net operating loss (NOL) refund. We paid $3.5 million in income taxes during 2015.

67

2014 versus 2013

	2014			2013			Percent Change (1)
	(In thousands unless otherwise specified)
Total operating revenue	$	1,572,944		$	1,351,850		16	%
Net income	$	136,276		$	184,746		(26	)%
Oil and Natural Gas:
Revenue	$	740,079		$	649,718		14	%
Operating costs excluding depreciation, depletion, amortization, and impairment	$	187,916		$	184,001		2	%
Depreciation, depletion, and amortization	$	276,088		$	226,498		22	%
Impairment of oil and natural gas properties	$	76,683		$	—		NM
Average oil price received (Bbl)	$	89.43		$	95.06		(6	)%
Average NGLs price received (Bbl)	$	30.95		$	31.79		(3	)%
Average natural gas price received (Mcf)	$	3.92		$	3.32		18	%
Oil production (Bbl)	3,844,000			3,360,000			14	%
NGLs production (Bbl)	4,628,000			3,914,000			18	%
Natural gas production (Mcf)	58,854,000			56,757,000			4	%
Depreciation, depletion, and amortization rate (Boe)	$	14.82		$	13.32		11	%
Contract Drilling:
Revenue	$	476,517		$	414,778		15	%
Operating costs excluding depreciation and impairment	$	274,933		$	247,280		11	%
Depreciation	$	85,370		$	71,194		20	%
Impairment of contract drilling equipment	$	74,318		$	—		NM
Percentage of revenue from daywork contracts	100		%	100		%
Average number of drilling rigs in use	75.4			65.0			16	%
Average dayrate on daywork contracts	$	20,043		$	19,646		2	%
Mid-Stream:
Revenue	$	356,348		$	287,354		24	%
Operating costs excluding depreciation, amortization, and impairment	$	306,831		$	243,406		26	%
Depreciation and amortization	$	40,434		$	33,191		22	%
Impairment of gas gathering and processing systems	$	7,068		$	—		NM
Gas gathered—Mcf/day	319,348			309,554			3	%
Gas processed—Mcf/day	161,282			140,584			15	%
Gas liquids sold—gallons/day	733,406			543,602			35	%
Corporate and other:
General and administrative expense	$	42,023		$	38,323		10	%
Gain on disposition of assets	$	8,953		$	17,076		(48	)%
Other income (expense):
Interest expense, net	$	(17,371	)	$	(15,015	)	16	%
Gain (loss) on derivatives not designated as hedges and hedge ineffectiveness, net	$	30,147		$	(8,374	)	NM
Other	$	(70	)	$	(175	)	(60	)%
Income tax expense	$	86,663		$	116,723		(26	)%
Average interest rate	6.5		%	6.4		%	2	%
Average long-term debt outstanding	$	674,832		$	686,656		(2	)%

_________________________

(1) NM – A percentage calculation is not meaningful due to a zero-value denominator or a percentage change greater than 200.

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Oil and Natural Gas

Oil and natural gas revenues increased $90.4 million or 14% in 2014 as compared to 2013 primarily due to a 9% increase in equivalent production volumes. Oil production increased 14%, NGLs production increased 18%, and natural gas production increased 4%. Average oil prices between the comparative years decreased 6% to $89.43 per barrel and NGLs prices decreased 3% to $30.95 per barrel while prices for natural gas increased 18% to $3.92 per Mcf.

Oil and natural gas operating costs increased $3.9 million or 2% between the comparative years of 2014 and 2013 due to increased lease operating costs, higher saltwater disposal expenses, and increased general and administrative expense partially offset by lower gross production tax due to tax credits.

DD&A increased $49.6 million or 22% primarily due to an 9% increase in equivalent production and an 11% increase in our DD&A rate. The increase in our DD&A rate in 2014 compared to 2013 resulted primarily from increased capitalized cost on new wells drilled between periods. Our DD&A expense on our oil and natural gas properties is calculated each quarter utilizing period end reserve quantities adjusted for current period production.

In December 2014, we determined the value of certain unproved oil and gas properties were diminished (in part or in whole) based on an impairment evaluation and our anticipated future exploration plans. That determination resulted in $73.7 million of costs associated with the unproved properties being added to the capitalized costs to be amortized. We incurred a non-cash ceiling test write-down of our oil and natural gas properties of $76.7 million pre-tax ($47.7 million net of tax). We did not have any ceiling test write-downs during 2013.

Contract Drilling

Drilling revenues increased $61.7 million or 15% in 2014 as compared to 2013. The increase was due primarily to a 16% increase in the average number of drilling rigs in use and a 2% increase in the average dayrate. Average drilling rig utilization increased from 65.0 drilling rigs in 2013 to 75.4 drilling rigs in 2014.

Drilling operating costs increased $27.7 million or 11% in 2014 compared to 2013. The increase was due primarily to higher direct and indirect expenses due to higher utilization. Contract drilling depreciation and impairment increased $88.5 million or 124% due primarily to the write-down of 31 drilling rigs and other assets and to a lesser extent the increase in utilization.

In December 2014, we removed from service 31 drilling rigs, some older top drives, and certain drill pipe no longer marketable in the current environment. We estimated the fair value of the drilling rigs and other assets based on the estimate market value from third-party assessments. Based on these estimates, we recorded a write-down of approximately $74.3 million pre-tax.

Mid-Stream

Our mid-stream revenues increased $69.0 million or 24% in 2014 as compared to 2013. The average price for natural gas sold increased 15%. Gas processing volumes per day increased 15% between the comparative years and NGLs sold per day increased 35% between the comparative periods. The increase in volumes processed per day is primarily attributable to the volumes added from new wells connected to existing systems and increased capacity of processing facilities. Gas gathering volumes per day increased 3% primarily from new well connections.

Operating costs increased $63.4 million or 26% in 2014 compared to 2013 primarily due to an 8% increase in prices paid for natural gas purchased. Depreciation, amortization, and impairment increased $14.3 million or 43% primarily due to the write-down of three systems and additional assets placed into service throughout 2013.

In December 2014, our mid-stream segment had a $7.1 million pre-tax write-down of three of its systems, Weatherford, Billy Rose, and Spring Creek due to anticipated future cash flow and future development around these systems not being sufficient to support their carrying value. The estimated future cash flows were less than the carrying value on these systems.

Due to the decline in NGLs prices during 2014, in the second half of the year we operated our processing facilities in full ethane rejection mode which reduced the amount of liquids sold during this time period. As long as NGLs prices continue at or

69

below these levels,we expect to continue operating in full ethane rejection mode. Our mid-stream segment did not experience a significant reduction in processed volumes in 2014 but as low prices continue we expect further reductions in drilling activity around our systems which will eventually effect our ability to connect new wells resulting in lower processed volumes in the future.

General and Administrative

General and administrative expenses increased $3.7 million or 10% in 2014 compared to 2013. The increase was primarily due to increases in employee costs.

Gain on Disposition of Assets

Gain on disposition of assets decreased $8.1 million in 2014 compared to 2013 primarily due to the sale of fewer drilling rigs.

Other Income (Expense)

Interest expense, net of capitalized interest, increased $2.4 million between the comparative years of 2014 and 2013. We capitalized interest based on the net book value associated with unproved properties not being amortized, the construction of additional drilling rigs, and the construction of gas gathering systems. Capitalized interest for 2014 was $32.2 million compared to $33.7 million in 2013, and was netted against our gross interest of $49.6 million and $48.7 million for 2014 and 2013, respectively. Our average interest rate increased from 6.4% to 6.5% and our average debt outstanding was $11.8 million lower in 2014 as compared to 2013 primarily due to the reduction of outstanding borrowings under our credit agreement over the comparative periods.

Gain (loss) on derivatives not designated as hedges and hedge ineffectiveness, net increased from a loss of $8.4 million in 2013 to a gain of $30.1 million in 2014 primarily due to fluctuations in forward prices used to estimate the fair value in mark-to-market accounting.

Income Tax Expense

Income tax expense decreased $30.1 million in 2014 compared to 2013 primarily due to decreased income due to the impairments in all three segments during 2014. Our effective tax rate was 38.9% for 2014 and 38.7% for 2013. This increase is primarily due to the effect of permanent differences as they relate to the decline in pre-tax income. Current income tax expense was $9.4 million in 2014 compared to a current income tax expense of $16.0 million for 2013. This decrease is also primarily due to decreased income. We paid $15.9 million in income taxes during 2014.

Item 7A. Quantitative and Qualitative Disclosures about Market Risk

Our operations are exposed to market risks primarily as a result of changes in the prices for natural gas and oil and interest rates.

Commodity Price Risk.  Our major market risk exposure is in the prices we receive for our oil, NGLs, and natural gas production. Those prices are primarily driven by the prevailing worldwide price for crude oil and market prices applicable to our natural gas production. Historically, these prices have fluctuated and we expect they will continue to do so. The price of oil, NGLs, and natural gas also affects both the demand for our drilling rigs and the amount we can charge for the use of our drilling rigs. Based on our 2015 production, a $0.10 per Mcf change in what we are paid for our natural gas production would result in a corresponding $520,000 per month ($6.2 million annualized) change in our pre-tax cash flow. A $1.00 per barrel change in our oil price would have a $303,000 per month ($3.6 million annualized) change in our pre-tax operating cash flow and a $1.00 per barrel change in our NGLs prices would have a $419,000 per month ($5.0 million annualized) change in our pre-tax cash flow.

We use derivative transactions to manage the risk associated with price volatility. Our decision on the type and quantity of our production and the price(s) of our derivative(s) is based, in part, on our view of current and future market conditions. The transactions we use include financial price swaps under which we will receive a fixed price for our production and pay a variable market price to the contract counterparty. We do not hold or issue derivative instruments for speculative trading purposes.

70

At December 31, 2015, the following non-designated hedges were outstanding:

Term	Commodity	Contracted Volume	Weighted Average Fixed Price for Swaps	Contracted Market
Jan’16 – Dec’16	Natural gas – swap	35,000 MMBtu/day	$2.625	IF – NYMEX (HH)
Jan’16 – Dec'16	Natural gas – collar	42,000 MMBtu/day	$2.40 - $2.88	IF – NYMEX (HH)
Jan’16 – Dec'16	Natural gas – three-way collar	13,500 MMBtu/day	$2.70 - $2.20 - $3.26	IF – NYMEX (HH)
Jan’17 – Dec'17	Natural gas – three-way collar	15,000 MMBtu/day	$2.50 - $2.00 - $3.32	IF – NYMEX (HH)
Jan’16 – Jun'16	Crude oil – collar	2,150 Bbl/day	$46.36 - $55.62	WTI – NYMEX
Jul’16 – Dec'16	Crude oil – collar	1,450 Bbl/day	$47.50 - $56.40	WTI – NYMEX
Jan’16 – Dec'16	Crude oil – three-way collar	700 Bbl/day	$46.50 - $35.00 - $57.00	WTI – NYMEX
Jul’16 – Dec'16	Crude oil – three-way collar (1)	700 Bbl/day	$47.50 - $35.00 - $63.50	WTI – NYMEX
Jan’17 – Dec'17	Crude oil – three-way collar	750 Bbl/day	$50.00 - $37.50 - $63.90	WTI – NYMEX

_________________________

(1) We pay our counterparty a premium, which can be and is being deferred until settlement.

Subsequent to December 31, 2015, the following non-designated hedges were entered into:

Term	Commodity	Contracted Volume	Weighted Average  Fixed Price for Swaps	Contracted Market
Feb’16 – Dec'16	Natural gas – swap	10,000 MMBtu/day	$2.495	IF – NYMEX (HH)
Jan’17 – Dec'17	Natural gas – swap	10,000 MMBtu/day	$2.795	IF – NYMEX (HH)

Interest Rate Risk.  Our interest rate exposure relates to our long-term debt under our credit agreement and the Notes. The credit agreement, at our election bears interest at variable rates based on the Prime Rate or the LIBOR Rate. At our election, borrowings under our credit agreement may be fixed at the LIBOR Rate for periods of up to 180 days. Based on our average outstanding long-term debt subject to a variable rate in 2015, a 1% increase in the floating rate would reduce our annual pre-tax cash flow by approximately $2.5 million. Under our Notes, we pay a fixed rate of interest of 6.625% per year (payable semi-annually in arrears on May 15 and November 15 of each year).

71

Item 8.     Financial Statements and Supplementary Data

Index to Financial Statements

Unit Corporation and Subsidiaries

	Page
Management’s Report on Internal Control over Financial Reporting	73
Consolidated Financial Statements:
Report of Independent Registered Public Accounting Firm	74
Consolidated Balance Sheets at December 31, 2015 and 2014	75
Consolidated Statements of Operations for the Years Ended December 31, 2015, 2014, and 2013	77
Consolidated Statements of Comprehensive Income (Loss) for the Years Ended December 31, 2015, 2014, and 2013	78
Consolidated Statements of Changes in Shareholders’ Equity for the Years Ended December 31, 2013, 2014, and 2015	79
Consolidated Statements of Cash Flows for the Years Ended December 31, 2015, 2014, and 2013	80
Notes to Consolidated Financial Statements	81

72

Management’s Report on Internal Control over Financial Reporting

Management of the company is responsible for establishing and maintaining adequate internal control over financial reporting. Internal control over financial reporting is defined in Rules 13a-15(f) or 15d-15(f) promulgated under the Securities Exchange Act of 1934 as a process designed by, or under the supervision of, the company’s principal executive and principal financial officers and effected by the company’s board of directors, management and other personnel, 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 and includes those policies and procedures that:

• Pertain to the maintenance of records that in reasonable detail accurately and fairly reflect the transactions and dispositions of the assets of the company;

• 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

• 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. Internal control over financial reporting cannot provide absolute assurance of achieving financial reporting objectives because of its inherent limitations. Internal control over financial reporting is a process that involves human diligence and compliance and is subject to lapses in judgment and breakdowns resulting from human failures. Internal control over financial reporting also can be circumvented by collusion or improper management override. Because of such limitations, there is a risk that material misstatements may not be prevented or detected on a timely basis by internal control over financial reporting. However, these inherent limitations are known features of the financial reporting process. Therefore, it is possible to design into the process safeguards to reduce, though not eliminate, this risk.

The company’s management assessed the effectiveness of the company’s internal control over financial reporting as of December 31, 2015. In making this assessment, the company’s management used the criteria set forth in Internal Control—Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). Based on their assessment, the company’s management concluded that, as of December 31, 2015, the company’s internal control over financial reporting was effective based on those criteria.

The effectiveness of the company’s internal control over financial reporting as of December 31, 2015, has been audited by PricewaterhouseCoopers LLP, an independent registered public accounting firm, as stated in their report which appears herein.

73

Report of Independent Registered Public Accounting Firm

To Board of Directors and Shareholders of Unit Corporation:

In our opinion, the accompanying consolidated balance sheets and the related consolidated statements of operations, comprehensive income (loss), changes in shareholders’ equity, and cash flows present fairly, in all material respects, the financial position of Unit Corporation and its subsidiaries at December 31, 2015 and 2014, and the results of their operations and their cash flows for each of the three years in the period ended December 31, 2015, in conformity with accounting principles generally accepted in the United States of America. In addition, in our opinion, the financial statement schedule listed in the index appearing under Item 15(a)(2), presents fairly, in all material respects, the information set forth therein when read in conjunction with the related consolidated financial statements. Also in our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2015, based on criteria established in Internal Control - Integrated Framework (2013)issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). The Company's management is responsible for these financial statements and financial statement schedule, 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 opinions on these financial statements, on the financial statement schedule and on the Company's internal control over financial reporting based on our integrated 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 audits to obtain reasonable assurance about whether the financial statements are free of material misstatement and whether effective internal control over financial reporting was maintained in all material respects. Our audits of the financial statements included examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements, assessing the accounting principles used and significant estimates made by management, and evaluating the overall financial statement presentation. Our audit of internal control over financial reporting included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, and testing and evaluating the design and operating effectiveness of internal control based on the assessed risk. Our audits also included performing such other procedures as we considered necessary in the circumstances. We believe that our audits provide a reasonable basis for our opinions.

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 (i) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (ii) 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 (iii) 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.

/s/ PricewaterhouseCoopers LLP

Tulsa, Oklahoma

February 25, 2016

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CONSOLIDATED BALANCE SHEETS

	As of December 31,
	2015		2014
	(In thousands except share and par value amounts)
ASSETS
Current assets:
Cash and cash equivalents	$	835	$	1,049
Accounts receivable (less allowance for doubtful accounts of $5,199 and $5,039 at December 31, 2015 and 2014, respectively)	79,941		189,812
Materials and supplies	3,565		5,590
Current derivative asset (Note 12)	10,186		31,139
Current income tax receivable	21,002		—
Current deferred tax asset (Note 8)	14,206		11,527
Assets held for sale (Note 2)	615		—
Prepaid expenses and other	9,908		13,374
Total current assets	140,258		252,491
Property and equipment:
Oil and natural gas properties, on the full cost method:
Proved properties	5,401,618		4,990,753
Unproved properties not being amortized	337,099		485,568
Drilling equipment	1,567,560		1,620,692
Gas gathering and processing equipment	689,063		628,689
Saltwater disposal systems	60,316		56,702
Corporate land and building	49,890		16,104
Transportation equipment	40,072		40,693
Other	45,489		41,602
	8,191,107		7,880,803
Less accumulated depreciation, depletion, amortization, and impairment	5,609,980		3,747,412
Net property and equipment	2,581,127		4,133,391
Debt issuance cost	8,667		10,255
Goodwill (Note 2)	62,808		62,808
Non-current derivative asset (Note 12)	968		—
Other assets	14,681		14,783
Total assets	$	2,808,509	$	4,473,728

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CONSOLIDATED BALANCE SHEETS - (Continued)

	As of December 31,
	2015		2014
	(In thousands except share and par value amounts)
LIABILITIES AND SHAREHOLDERS’ EQUITY
Current liabilities:
Accounts payable	$	87,413	$	218,500
Accrued liabilities (Note 5)	46,918		70,171
Income taxes payable	—		481
Current portion of other long-term liabilities (Note 6)	16,560		15,019
Total current liabilities	150,891		304,171
Long-term debt (Note 6)	927,662		812,163
Non-current derivative liabilities (Note 12)	285		—
Other long-term liabilities (Note 6)	140,341		148,785
Deferred income taxes (Note 8)	275,750		876,215
Commitments and contingencies (Note 15)	—		—
Shareholders’ equity:
Preferred stock, $1.00 par value, 5,000,000 shares authorized, none issued	—		—
Common stock, $0.20 par value, 175,000,000 shares authorized, 50,413,101 and 49,593,812 shares issued as of December 31, 2015 and 2014, respectively	9,831		9,732
Capital in excess of par value	486,571		468,123
Retained earnings	817,178		1,854,539
Total shareholders’ equity	1,313,580		2,332,394
Total liabilities and shareholders’ equity	$	2,808,509	$	4,473,728

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

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CONSOLIDATED STATEMENTS OF OPERATIONS

	Year Ended December 31,
	2015			2014			2013
	(In thousands except per share amounts)
Revenues:
Oil and natural gas	$	385,774		$	740,079		$	649,718
Contract drilling	265,668			476,517			414,778
Gas gathering and processing	202,789			356,348			287,354
Total revenues	854,231			1,572,944			1,351,850
Expenses:
Oil and natural gas:
Operating costs	166,046			187,916			184,001
Depreciation, depletion, and amortization	251,944			276,088			226,498
Impairment of oil and natural gas properties (Note 2)	1,599,348			76,683			—
Contract drilling:
Operating costs	156,408			274,933			247,280
Depreciation	56,135			85,370			71,194
Impairment of contract drilling equipment (Note 2)	8,314			74,318			—
Gas gathering and processing:
Operating costs	161,556			306,831			243,406
Depreciation and amortization	43,676			40,434			33,191
Impairment of gas gathering and processing systems (Note 2)	26,966			7,068			—
General and administrative	35,345			42,023			38,323
(Gain) loss on disposition of assets	7,229			(8,953		)	(17,076		)
Total expenses	2,512,967			1,362,711			1,026,817
Income (loss) from operations	(1,658,736		)	210,233			325,033
Other income (expense):
Interest, net	(31,963		)	(17,371		)	(15,015		)
Gain (loss) on derivatives not designated as hedges and hedge ineffectiveness, net	26,345			30,147			(8,374		)
Other	45			(70		)	(175		)
Total other income (expense)	(5,573		)	12,706			(23,564		)
Income (loss) before income taxes	(1,664,309		)	222,939			301,469
Income tax expense (benefit):
Current	(20,616		)	9,378			15,991
Deferred	(606,332		)	77,285			100,732
Total income taxes	(626,948		)	86,663			116,723
Net income (loss)	$	(1,037,361	)	$	136,276		$	184,746
Net income (loss) per common share:
Basic	$	(21.12	)	$	2.80		$	3.83
Diluted	$	(21.12	)	$	2.78		$	3.80

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

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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)

	For Years ended December 31,
	2015			2014		2013
	(In thousands)
Net income (loss)	$	(1,037,361	)	$	136,276	$	184,746
Other comprehensive income (loss), net of taxes:
Change in value of derivative instruments used as cash flow hedges, net of tax of $0, $0, and ($4,717)	—			—		(7,349		)
Reclassification - derivative settlements, net of tax of $0, $0, and ($249)	—			—		(354		)
Ineffective portion of derivatives, net of tax of $0, $0, and $74	—			—		116
Comprehensive income (loss)	$	(1,037,361	)	$	136,276	$	177,159

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

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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS’ EQUITY

Year Ended December 31, 2013, 2014, and 2015

	Common Stock		Capital In Excess of Par Value		Accumulated Other Comprehensive Income			Retained Earnings			Total
	(In thousands except share amounts)
Balances, January 1, 2013	$	9,594	$	423,603	$	7,587		$	1,533,517		$	1,974,301
Comprehensive income:
Net income	—		—		—			184,746			184,746
Other comprehensive loss (net of tax ($4,892))	—		—		(7,587		)	—			(7,587		)
Total comprehensive income											177,159
Activity in employee compensation plans (525,056 shares)	65		21,867		—			—			21,932
Balances, December 31, 2013	9,659		445,470		—			1,718,263			2,173,392
Net income	—		—		—			136,276			136,276
Activity in employee compensation plans (486,808 shares)	73		22,653		—			—			22,726
Balances, December 31, 2014	9,732		468,123		—			1,854,539			2,332,394
Net income (loss)	—		—		—			(1,037,361		)	(1,037,361		)
Activity in employee compensation plans (819,289 shares)	99		18,448		—			—			18,547
Balances, December 31, 2015	$	9,831	$	486,571	$	—		$	817,178		$	1,313,580

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

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CONSOLIDATED STATEMENTS OF CASH FLOWS

	Year Ended December 31,
	2015			2014			2013
	(In thousands)
OPERATING ACTIVITIES:
Net income (loss)	$	(1,037,361	)	$	136,276		$	184,746
Adjustments to reconcile net income (loss) to net cash provided (used) by operating activities:
Depreciation, depletion, and amortization	354,830			404,943			333,907
Impairment of properties (Note 2)	1,634,628			158,069			—
(Gain) loss on derivatives	(26,345		)	(30,147		)	7,771
Cash (payments) receipts on derivatives settled	46,615			(6,038		)	(1,161		)
(Gain) loss on disposition of assets	7,229			(8,953		)	(17,076		)
Deferred tax expense (benefit)	(606,332		)	77,285			100,732
Employee stock compensation plans	21,468			24,320			21,317
Bad debt expense	1,191			3,562			—
ARO liability accretion	3,453			4,599			5,450
Other, net	(1,517		)	1,068			2,250
Changes in operating assets and liabilities increasing (decreasing) cash:
Accounts receivable	105,426			(60,800		)	2,967
Materials and supplies	1,507			2,602			(2,435		)
Prepaid expenses and other	(14,348		)	(444		)	1,813
Accounts payable	(20,306		)	4,715			15,715
Accrued liabilities	(22,920		)	(1,297		)	17,198
Contract advances	(274		)	(767		)	1,137
Net cash provided by operating activities	446,944			708,993			674,331
INVESTING ACTIVITIES:
Capital expenditures	(561,453		)	(981,374		)	(703,984		)
Producing property and other acquisitions	(179		)	(5,723		)	—
Proceeds from disposition of property and equipment	11,854			66,197			120,910
Other	—			303			3,894
Net cash used in investing activities	(549,778		)	(920,597		)	(579,180		)
FINANCING ACTIVITIES:
Borrowings under line of credit	618,500			725,800			222,500
Payments under line of credit	(503,500		)	(559,800		)	(293,600		)
Payments on capitalized leases	(3,549		)	(2,392		)	—
Proceeds from exercise of stock options	—			1,083			574
Tax (expense) benefit from stock compensation	(3,207		)	1,614			8
Increase (decrease) in book overdrafts (Note 2)	(5,624		)	27,755			(7,014		)
Net cash provided by (used in) financing activities	102,620			194,060			(77,532		)
Net increase (decrease) in cash and cash equivalents	(214		)	(17,544		)	17,619
Cash and cash equivalents, beginning of year	1,049			18,593			974
Cash and cash equivalents, end of year	$	835		$	1,049		$	18,593
Supplemental disclosure of cash flow information:
Cash paid during the year for:
Interest paid (net of capitalized)	$	30,910		$	13,620		$	12,485
Income taxes	$	3,540		$	15,898		$	9,100
Changes in accounts payable and accrued liabilities related to purchases of property, plant, and equipment	$	105,157		$	(31,968	)	$	(6,550	)
Non-cash reductions to oil and natural gas properties related to asset retirement obligations	$	5,694		$	37,689		$	17,952
Non-cash additions to property, plant, and equipment acquired under capital leases	$	—		$	(28,202	)	$	—

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

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

NOTE 1 – ORGANIZATION

Unless the context clearly indicates otherwise, references in this report to “Unit”, “Company”, “we”, “our”, “us”, or like terms refer to Unit Corporation and its subsidiaries.

We are primarily engaged in the exploration, development, acquisition, and production of oil and natural gas properties, the land contract drilling of natural gas and oil wells, and the buying, selling, gathering, processing, and treating of natural gas. Our operations are located principally in the United States and are organized in the following three reporting segments: (1) Oil and Natural Gas, (2) Contract Drilling, and (3) Mid-Stream.

Oil and Natural Gas.  Carried out by our subsidiary, Unit Petroleum Company, we explore, develop, acquire, and produce oil and natural gas properties for our own account. Our producing oil and natural gas properties, unproved properties, and related assets are located mainly in Oklahoma and Texas, and to a lesser extent, in Arkansas, Colorado, Kansas, Louisiana, Mississippi, Montana, New Mexico, North Dakota, and Wyoming.

Contract Drilling.  Carried out by our subsidiary, Unit Drilling Company, we drill onshore oil and natural gas wells for our own account as well as for a wide range of other oil and natural gas companies. Our drilling operations are mainly located in Oklahoma, Texas, Wyoming, North Dakota, and to a lesser extent in Louisiana and Kansas.

Historically, our contract drilling segment experienced more demand for natural gas drilling as opposed to drilling for oil and NGLs. Since 2008, operators have been focusing more on drilling for oil and NGLs.

Mid-Stream.  Carried out by our subsidiary, Superior Pipeline Company, L.L.C. and its subsidiaries, we buy, sell, gather, transport, process, and treat natural gas for our own account and for third parties. Mid-stream operations are performed in Oklahoma, Texas, Kansas, Pennsylvania, and West Virginia.

NOTE 2 – SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Principles of Consolidation.  The consolidated financial statements include the accounts of Unit Corporation and its subsidiaries. Our investment in limited partnerships is accounted for on the proportionate consolidation method, whereby our share of the partnerships’ assets, liabilities, revenues, and expenses are included in the appropriate classification in the accompanying consolidated financial statements.

Certain amounts in the accompanying consolidated financial statements for prior periods have been reclassified to conform to current year presentation. Certain financial statement captions were expanded or combined with no impact to consolidated net income or shareholders' equity.

Accounting Estimates.  The preparation of financial statements in conformity with generally accepted accounting principles (GAAP) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.

Drilling Contracts.  We recognize revenues and expenses generated from “daywork” drilling contracts as the services are performed, since we do not bear the risk of completion of the well. Under “footage” and “turnkey” contracts, we bear the risk of completion of the well; therefore, revenues and expenses are recognized when the well is substantially completed. Under this method, substantial completion is determined when the well bore reaches the negotiated depth as stated in the contract. The entire amount of a loss, if any, is recorded when the loss is determinable. The costs of uncompleted drilling contracts include expenses incurred to date on “footage” or “turnkey” contracts, which are still in process at the end of the period, and are included in other current assets. Typically, any one of these three types of contracts can be used for the drilling of one well which can take from 10 to 90 days. At December 31, 2015, all of our contracts were daywork contracts of which nine were multi-well and had durations which ranged from six months to three years, five of which expire in 2016 and four expiring in 2017. These longer term contracts may contain a fixed rate for the duration of the contract or provide for the periodic renegotiation of the rate within a specific range from the existing rate.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

Cash Equivalents and Book Overdrafts.  We include as cash equivalents all investments with maturities at date of purchase of three months or less which are readily convertible into known amounts of cash. Book overdrafts are checks that have been issued before the end of the period, but not presented to our bank for payment before the end of the period. At December 31, 2015 and 2014, book overdrafts were $22.1 million and $27.8 million, respectively.

Accounts Receivable.  Accounts receivable are carried on a gross basis, with no discounting, less an allowance for doubtful accounts. We estimate the allowance for doubtful accounts based on existing economic conditions, the financial condition of our customers, and the amount and age of past due accounts. Receivables are considered past due if full payment is not received by the contractual due date. Past due accounts are generally written off against the allowance for doubtful accounts only after all collection attempts have been unsuccessful.

Financial Instruments and Concentrations of Credit Risk and Non-performance Risk.  Financial instruments, which potentially subject us to concentrations of credit risk, consist primarily of trade receivables with a variety of oil and natural gas companies. We do not generally require collateral related to receivables. Our credit risk is considered to be limited due to the large number of customers comprising our customer base. Below are the third-party customers that accounted for more than 10% of our segment’s revenues:

	2015		2014		2013
Oil and Natural Gas:
Sunoco Logistics Partners L.P.	19	%	14	%	8	%
Valero Energy Corporation	15	%	24	%	25	%
Drilling:
QEP Resources, Inc.	25	%	19	%	18	%
Whiting Petroleum Corp. (formerly Kodiak Oil and Gas Corp.)	7	%	9	%	10	%
Mid-Stream:
ONEOK Partners, L.P.	29	%	44	%	57	%
Tenaska Resources, LLC	18	%	22	%	16	%
Laclede Group, Inc.	12	%	16	%	7	%

We had a concentration of cash of $2.3 million and $18.4 million at December 31, 2015 and 2014, respectively with one bank.

The use of derivative transactions also involves the risk that the counterparties will be unable to meet the financial terms of the transactions. We considered this non-performance risk with regard to our counterparties and our own non-performance risk in our derivative valuation at December 31, 2015 and determined there was no material risk at that time. At December 31, 2015, the fair values of the net assets we had with each of the counterparties with respect to all of our commodity derivative transactions are listed in the table below:

	December 31, 2015
	(In millions)
Canadian Imperial Bank of Commerce	$	8.7
Bank of Montreal	1.1
Scotiabank	0.7
Bank of America Merrill Lynch	0.4
Total assets	$	10.9

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

Property and Equipment.  Drilling equipment, transportation equipment, gas gathering and processing systems, and other property and equipment are carried at cost less accumulated depreciation. Renewals and enhancements are capitalized while repairs and maintenance are expensed. Depreciation of drilling equipment is recorded using the units-of-production method based on estimated useful lives starting at 15 years , including a minimum provision of 20% of the active rate when the equipment is idle. We use the composite method of depreciation for drill pipe and collars and calculate the depreciation by footage actually drilled compared to total estimated remaining footage. Depreciation of other property and equipment is computed using the straight-line method over the estimated useful lives of the assets ranging from 3 to 15 years.

We review the carrying amounts of long-lived assets for potential impairment annually, typically during the fourth quarter, or when events occur or changes in circumstances suggest that these carrying amounts may not be recoverable. Changes that could prompt such an assessment may include equipment obsolescence, changes in the market demand for a specific asset, changes in commodity prices, periods of relatively low drilling rig utilization, declining revenue per day, declining cash margin per day, or overall changes in general market conditions. Assets are determined to be impaired if a forecast of undiscounted estimated future net operating cash flows directly related to the asset, including disposal value if any, is less than the carrying amount of the asset. If any asset is determined to be impaired, the loss is measured as the amount by which the carrying amount of the asset exceeds its fair value. The estimate of fair value is based on the best information available, including prices for similar assets. Changes in these estimates could cause us to reduce the carrying value of property and equipment.Asset impairment evaluations are, by nature, highly subjective. They involve expectations about future cash flows generated by our assets and reflect management’s assumptions and judgments regarding future industry conditions and their effect on future utilization levels, dayrates, and costs. The use of different estimates and assumptions could result in materially different carrying values of our assets.

As of December 31, 2015, with continuing declines to commodity prices and an outlook that commodity prices may be lower for longer, we lowered our expectations about future utilization of our drilling rigs and associated cash flows.  We performed a Step 1 analysis as required by ASC 360-10-35 to assess the recoverability of long-lived assets within our contract drilling segment.  With respect to these assets, future cash flows were estimated over the expected remaining life of the assets. Management determined that, on an undiscounted basis, expected cash flows exceeded the carrying value of the long-lived assets within our contract drilling segment by 99%, and there was no impairment at December 31, 2015.

On a periodic basis, we evaluate our fleet of drilling rigs for marketability based on the condition of inactive rigs, expenditures that would be necessary to bring them to working condition and the expected demand for drilling services by rig type. The components comprising inactive rigs are evaluated, and those components with continuing utility to the Company’s other marketed rigs are transferred to other rigs or to its yards to be used as spare equipment. The remaining components of these rigs are retired. In December 2014, we removed from service 31 drilling rigs, some older top drives, and certain drill pipe no longer marketable in the current environment and based on the estimated market value from third-party assessments, we recorded a write-down of approximately $74.3 million, pre-tax. During the first quarter of 2015, we sold one of these drilling rigs to an unaffiliated third party. The proceeds of this sale, less costs to sell, exceeded the $0.3 million net book value of the drilling rig resulting in a gain of $7,900. During the second quarter, we recorded an additional write-down on the remaining drilling rigs and other equipment of approximately $8.3 million pre-tax based on the estimated market value from similar auctions. During the third quarter, we sold the remaining 30 drilling rigs and most of the equipment in an auction. The proceeds from the sale of those assets, less costs to sell, was less than the $11.0 million net book value resulting in a loss of $7.3 million pre-tax. Some of the equipment that was not sold at the auction will be sold within the next twelve months and remain classified as assets held for sale. The net book value of those assets is $0.6 million. When property and equipment components are disposed of, the cost and the related accumulated depreciation are removed from the accounts and any resulting gain or loss is generally reflected in operations. For dispositions of drill pipe and drill collars, an average cost for the appropriate feet of drill pipe and drill collars is removed from the asset account and charged to accumulated depreciation and proceeds, if any, are credited to accumulated depreciation.

In 2015, our mid-stream segment incurred a $27.0 million, pre-tax write-down of three of its systems, Bruceton Mills, Midwell, and Spring Creek due to anticipated future cash flow and future development around these systems not being sufficient to support their carrying value. The estimated future cash flows were less than the carrying value on these systems.

In 2014, our mid-stream segment incurred a $7.1 million, pre-tax write-down of three of its systems, Weatherford, Billy Rose, and Spring Creek due to anticipated future cash flow and future development around these systems not being sufficient to support their carrying value. The estimated future cash flows were less than the carrying value on these systems. No significant impairments were recorded in 2013.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

We record an asset and a liability equal to the present value of the expected future ARO associated with our oil and gas properties. The ARO asset is depreciated in a manner consistent with the depreciation of the underlying physical asset. We measure changes in the liability due to passage of time by accreting an interest charge. This amount is recognized as an increase in the carrying amount of the liability and as a corresponding accretion expense.

Capitalized Interest.  During 2015, 2014, and 2013, interest of approximately $21.7 million, $32.2 million, and $33.7 million, respectively, was capitalized based on the net book value associated with unproved properties not being amortized, the construction of additional drilling rigs, and the construction of gas gathering systems. Interest is being capitalized using a weighted average interest rate based on our outstanding borrowings.

Goodwill.Goodwill represents the excess of the cost of acquisitions over the fair value of the net assets acquired. Goodwill is not amortized, but an impairment test is performed at least annually to determine whether the fair value has decreased and is performed additionally when events indicate an impairment may have occurred. For purposes of impairment testing, goodwill is evaluated at the reporting unit level. Our goodwill is all related to our contract drilling segment, and accordingly, the impairment test is generally based on the estimated discounted future net cash flows of our drilling segment, utilizing discount rates and other factors in determining the fair value of our drilling segment. Inputs in our estimated discounted future net cash flows include drilling rig utilization, day rates, gross margin percentages, and terminal value.No goodwill impairment was recorded for the years ended December 31, 2015, 2014, or 2013. There were no additions to goodwill in 2015, 2014, or 2013. Based on our impairment test performed as of December 31, 2015, the fair value of our drilling segment exceeded its carrying value by 19%. Goodwill of $2.2 million is deductible for tax purposes.

Intangible Assets.  Intangible assets are capitalized and amortized over the estimated period benefited. Such amounts are reviewed for possible impairment whenever events or changes in circumstances indicate that the carrying amount may not be recoverable. No intangible asset impairment was recorded for the years ended December 31, 2015, 2014, or 2013. Amortization of $0.7 million was recorded 2013. Accumulated amortization for 2013 was $18.0 million. Our intangible assets became fully amortized in 2013, so no amortization was recorded in 2014 or 2015.

Oil and Natural Gas Operations.  We account for our oil and natural gas exploration and development activities using the full cost method of accounting prescribed by the SEC. Accordingly, all productive and non-productive costs incurred in connection with the acquisition, exploration and development of our oil, NGLs, and natural gas reserves, including directly related overhead costs and related asset retirement costs, are capitalized and amortized on a units-of-production method based on proved oil and natural gas reserves. Directly related overhead costs of $19.2 million, $23.7 million, and $21.5 million were capitalized in 2015, 2014, and 2013, respectively. Independent petroleum engineers annually audit our internal evaluation of our reserves. The average rates used for depreciation, depletion, and amortization (DD&A) were $12.30, $14.82, and $13.32 per Boe in 2015, 2014, and 2013, respectively. The calculation of DD&A includes estimated future expenditures to be incurred in developing proved reserves and estimated dismantlement and abandonment costs, net of estimated salvage values. Our unproved properties totaling $337.1 million are excluded from the DD&A calculation.

No gains or losses are recognized on the sale, conveyance, or other disposition of oil and natural gas properties unless a significant reserve amount to our total reserves is involved.

Revenue from the sale of oil and natural gas is recognized when title passes, net of royalties.

Under the full cost rules, at the end of each quarter, we review the carrying value of our oil and natural gas properties. The full cost ceiling is based principally on the estimated future discounted net cash flows from our oil and natural gas properties discounted at 10%. We use the unweighted arithmetic average of the commodity prices existing on the first day of each of the 12 months before the end of the reporting period to calculate discounted future revenues, unless prices were otherwise determined under contractual arrangements. In the event the unamortized cost of oil and natural gas properties being amortized exceeds the full cost ceiling, as defined by the SEC, the excess is charged to expense in the period during which such excess occurs. Once incurred, a write-down of oil and natural gas properties is not reversible.

We determined the value of certain unproved oil and gas properties were diminished (in part or in whole) based on an impairment evaluation and our anticipated future exploration plans. Those determinations resulted in $73.7 million (in 2014) and $114.4 million (in 2015) of costs being added to the total of our capitalized costs being amortized. We incurred a

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$76.7 million pre-tax ($47.7 million net of tax) non-cash ceiling test write-down of our oil and natural gas properties in 2014. In 2015, we incurred non-cash ceiling test write-downs of our oil and natural gas properties of $1.6 billion pre-tax ($1.0 billion net of tax) in 2015 due to the inclusion of the impaired value of those unproved properties and a reduction of the 12-month average commodity prices during the year.

Our contract drilling segment provides drilling services for our exploration and production segment. Depending on their timing some of the drilling services performed on our properties are also deemed to be associated with the acquisition of an ownership interest in the property. Revenues and expenses for such services are eliminated in our statement of operations, with any profit recognized as a reduction in our investment in our oil and natural gas properties. The contracts for these services are issued under the same conditions and rates as the contracts entered into with unrelated third parties. We eliminated revenue of $22.1 million, $89.5 million, and $64.3 million for 2015, 2014, and 2013, respectively from our contract drilling segment and eliminated the associated operating expense of $18.3 million, $62.4 million, and $46.9 million during 2015, 2014, and 2013, respectively, yielding $3.8 million, $27.1 million, and $17.4 million during 2015, 2014, and 2013, respectively, as a reduction to the carrying value of our oil and natural gas properties.

Gas Gathering and Processing Revenue. Our gathering and processing segment recognizes revenue from the gathering and processing of natural gas and NGLs in the period the service is provided based on contractual terms.

Insurance.  We are self-insured for certain losses relating to workers’ compensation, control of well and employee medical benefits. Insured policies for other coverage contain deductibles or retentions per occurrence that range from zero to $1.0 million. We have purchased stop-loss coverage in order to limit, to the extent feasible, per occurrence and aggregate exposure to certain types of claims. However, there is no assurance that the insurance coverages we have will adequately protect us against liability from all potential consequences. Unit Texas Drilling, L.L.C. was merged into its parent company, Unit Drilling Company, effective October 31, 2015, at which time the ERISA governed occupational injury benefit program was closed. All new claims after this date are processed under an existing insured workers’ compensation program. If insurance coverage becomes more expensive, we may choose to self-insure, decrease our limits, raise our deductibles, or any combination of these rather than pay higher premiums.

Derivative Activities.  All derivatives are recognized on the balance sheet and measured at fair value. For our economic hedges that we did not apply cash flow accounting to, any changes in their fair value occurring before their maturity (i.e., temporary fluctuations in value) are reported in gain (loss) on derivatives not designated as hedges and hedge ineffectiveness, net in our Consolidated Statements of Operations. The commodity derivative instruments we had under cash flow accounting expired as of December 2013. Previous changes in the fair value of derivatives designated as cash flow hedges, to the extent they were effective in offsetting cash flows attributable to the hedged risk, were recorded in OCI until the hedged item was recognized into earnings. When the hedged item was recognized into earnings, it was reported in oil and natural gas revenues. Any change in fair value resulting from ineffectiveness was recognized in gain (loss) on derivatives not designated as hedges and hedge ineffectiveness, net. In August 2012, we determined on a prospective basis, to enter into economic hedges without electing cash flow hedge accounting.

We do not engage in derivative transactions for speculative purposes. We document our risk management strategy, and for the cash flow hedges, we tested the hedge effectiveness at the inception of and during the term of each hedge.

Limited Partnerships.  Unit Petroleum Company is a general partner in 15 oil and natural gas limited partnerships sold privately and publicly. Some of our officers, directors, and employees own the interests in most of these partnerships. We share in each partnership’s revenues and costs in accordance with formulas set out in each of the limited partnership agreement. The partnerships also reimburse us for certain administrative costs incurred on behalf of the partnerships.

Income Taxes.  Measurement of current and deferred income tax liabilities and assets is based on provisions of enacted tax law; the effects of future changes in tax laws or rates are not included in the measurement. Valuation allowances are established where necessary to reduce deferred tax assets to the amount expected to be realized. Income tax expense is the tax payable for the year and the change during that year in deferred tax assets and liabilities.

The accounting for uncertainty in income taxes prescribes a recognition threshold and measurement attribute for the financial statement recognition and measurement of a tax position taken or expected to be taken in a return. Guidance is also provided on de-recognition, classification, interest and penalties, accounting in interim periods, disclosure, and transition. We have $0.4 million of unrecognized tax benefits.

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Natural Gas Balancing.  We use the sales method for recording natural gas sales. This method allows for recognition of revenue, which may be more or less than its share of pro-rata production from certain wells. We estimate our December 31, 2015 balancing position to be approximately 4.7 Bcf on under-produced properties and approximately 4.8 Bcf on over-produced properties. We have recorded a receivable of $2.5 million on certain wells where we estimate that insufficient reserves are available for us to recover the under-production from future production volumes. We have also recorded a liability of $5.0 million on certain properties where we believe there are insufficient reserves available to allow the under-produced owners to recover their under-production from future production volumes. Our policy is to expense the pro-rata share of lease operating costs from all wells as incurred. Such expenses relating to the balancing position on wells in which we have imbalances are not material.

Employee and Director Stock Based Compensation.  We recognize in our financial statements the cost of employee services received in exchange for awards of equity instruments based on the grant date fair value of those awards. The amount of our equity compensation cost relating to employees directly involved in exploration activities of our oil and natural gas segment is capitalized to our oil and natural gas properties. Amounts not capitalized to our oil and natural gas properties are recognized in general and administrative expense and operating costs of our business segments. We utilize the Black-Scholes option pricing model to measure the fair value of stock options and stock appreciation rights (SARs). The value of our restricted stock grants is based on the closing stock price on the date of the grants.

Impact of Financial Accounting Pronouncements.

Income Taxes: Balance Sheet Classification of Deferred Taxes. The FASB has issued ASU 2015-17. This changes how deferred taxes are classified on organizations' balance sheets. Organizations will be required to classify all deferred tax assets and liabilities as noncurrent. The amendments apply to all organizations that present a classified balance sheet. For public companies, the amendments are effective for financial statements issued for annual periods beginning after December 15, 2016, and interim periods within those annual periods. Early adoption of the amendments is permitted. We are in the process of evaluating the impact it will have on our financial statements.

Interest—Imputation of Interest: Simplifying the Presentation of Debt Issuance Costs. The FASB has issued ASU 2015-03. The amendments in this ASU require that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. The FASB has also issued ASU 2015-15. The amendments in this ASU allow an entity to defer and present debt issuance cost as an asset and subsequently amortize the deferred debt issuance costs ratably over the term of the line-of-credit arrangement, regardless of whether there are any outstanding borrowings on the line-of-credit arrangement. For public business entities, the amendments are effective for financial statements issued for fiscal years beginning after December 15, 2015, and interim periods within those fiscal years. Early adoption of the amendments is permitted for financial statements that have not been previously issued. The amendments should be applied on a retrospective basis, wherein the balance sheet of each individual period presented should be adjusted to reflect the period-specific effects of applying the new guidance. We do not expect the adoption of this guidance will have a material impact on our financial statements.

Revenue from Contracts with Customers. The FASB has issued ASU 2014-09. This affects any entity using U.S. GAAP that either enters into contracts with customers to transfer goods or services or enters into contracts for the transfer of nonfinancial assets unless those contracts are within the scope of other standards (e.g., insurance contracts or lease contracts). The core principle of the guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The FASB has issued 2015-14, which defers the effective date to annual reporting periods beginning after December 15, 2017, including interim reporting periods within that reporting period. We are in the process of evaluating the impact it will have on our financial statements.

NOTE 3 – DIVESTITURES

Oil and Natural Gas

In August 2013, we sold additional Bakken property interests. The proceeds, net of related expenses, were $57.1 million. In addition, we had other non-core asset sales with proceeds, net of related expenses, of $21.7 million, $33.1 million, and $1.9 million in 2013, 2014, and 2015, respectively. Proceeds from these dispositions reduced the net book value of the full cost pool with no gain or loss recognized.

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Contract Drilling

During 2013, we sold five 2,000-3,000 horsepower drilling rigs to unaffiliated third-parties for a gain of $16.5 million. Four of our idle drilling rigs were classified as assets held for sale at December 31, 2013.

These four drilling rigs were sold to an unaffiliated third party in the first quarter of 2014. The proceeds of this sale, less costs to sell, exceeded the $16.3 million net book value of the drilling rigs, both in the aggregate and for each drilling rig, resulting in a gain of $9.6 million.

During the first quarter of 2015, we sold one drilling rig to an unaffiliated third party for $0.3 million resulting in a gain of $7,900. During the third quarter, we sold 30 drilling rigs, some old top drive equipment, and drill pipe in an auction. The proceeds from the sale of those assets, less costs to sell, was less than the $11.0 million net book value resulting in a loss of $7.3 million pre-tax.

NOTE 4 – EARNINGS (LOSS) PER SHARE

The following data shows the amounts used in computing earnings (loss) per share:

	Income (Loss) (Numerator)			Weighted Shares (Denominator)	Per-Share Amount
	(In thousands except per share amounts)
For the year ended December 31, 2013:
Basic earnings per common share	$	184,746		48,218	$	3.83
Effect of dilutive stock options, restricted stock, and SARs	—			354	(0.03		)
Diluted earnings per common share	$	184,746		48,572	$	3.80
For the year ended December 31, 2014:
Basic earnings per common share	$	136,276		48,611	$	2.80
Effect of dilutive stock options, restricted stock, and SARs	—			472	(0.02		)
Diluted earnings per common share	$	136,276		49,083	$	2.78
For the year ended December 31, 2015:
Basic earnings (loss) per common share	$	(1,037,361	)	49,110	$	(21.12	)
Effect of dilutive stock options, restricted stock, and SARs	—			—	—
Diluted earnings (loss) per common share	$	(1,037,361	)	49,110	$	(21.12	)

Due to the net loss for the year ended December 31, 2015, approximately 186,000 weighted average shares related to stock options, restricted stock, and SARs were antidilutive and were excluded from the earnings per share calculation above.

The following options and their average exercise prices were not included in the computation of diluted earnings per share because the option exercise prices were greater than the average market price of our common stock for the years ended December 31:

	2015		2014		2013
Options and SARs	261,270		73,500		149,665
Average exercise price	$	50.34	$	64.43	$	58.41

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NOTE 5 – ACCRUED LIABILITIES

Accrued liabilities consisted of the following as of December 31:

	2015		2014
	(In thousands)
Lease operating expenses	$	17,220	$	20,709
Employee costs	12,641		31,451
Interest payable	6,321		6,654
Taxes	3,767		3,284
Third-party credits	3,326		2,825
Other	3,643		5,248
Total accrued liabilities	$	46,918	$	70,171

NOTE 6 – LONG-TERM DEBT AND OTHER LONG-TERM LIABILITIES

Long-Term Debt

Long-term debt consisted of the following as of December 31:

	2015		2014
	(In thousands)
Credit agreement with an average interest rates of 2.6% and 2.9% at December 31, 2015 and 2014, respectively	$	281,000	$	166,000
6.625% senior subordinated notes due 2021, net of unamortized discount of $3.3 million and $3.8 million at December 31, 2015 and 2014, respectively	646,662		646,163
Total long-term debt	$	927,662	$	812,163

Credit Agreement. On April 10, 2015, we amended our Senior Credit Agreement (credit agreement) to extend the maturity date from September 13, 2016 to April 10, 2020. The amount we can borrow is the lesser of the amount we elect (from time to time) as the commitment amount or the value of the borrowing base as determined by the lenders, but in either event not to exceed the maximum credit agreement amount of $900.0 million. Our current commitment amount is $500.0 million. Our current borrowing base is $550.0 million. We are charged a commitment fee ranging from 0.375% to 0.50% on the amount available but not borrowed. The fee varies based on the amount borrowed as a percentage of the amount of the total borrowing base. To date, for this new amendment, we paid $2.6 million in origination, agency, syndication, and other related fees. We are amortizing these fees over the life of the credit agreement.

The amount of the borrowing base–which is subject to redetermination by the lenders on April 1st and October 1st of each year, is based primarily on a percentage of the discounted future value of our oil and natural gas reserves. Effective with the October 2015 redetermination, the lenders under our credit agreement decreased our borrowing base from $725.0 million to $550.0 million. We or the lenders may request a onetime special redetermination of the borrowing base between each scheduled redetermination. In addition, we may request a redetermination following the completion of an acquisition that meets the requirements set forth in the credit agreement.

At our election, any part of the outstanding debt under the credit agreement may be fixed at a London Interbank Offered Rate (LIBOR). LIBOR interest is computed as the sum of the LIBOR base for the applicable term plus 1.75% to 2.50% depending on the level of debt as a percentage of the borrowing base and is payable at the end of each term, or every 90 days, whichever is less. Borrowings not under LIBOR bear interest at the prime rate specified in the credit agreement that in any event cannot be less than LIBOR plus 1.00%. Interest is payable at the end of each month and the principal may be repaid in whole or in part at anytime, without a premium or penalty. At December 31, 2015, we had $281.0 million outstanding borrowings under our credit agreement.

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We can use borrowings for financing general working capital requirements for (a) exploration, development, production and acquisition of oil and gas properties, (b) acquisitions and operation of mid-stream assets, (c) issuance of standby letters of credit, (d) contract drilling services, and (e) general corporate purposes.

The credit agreement prohibits, among other things:

• the payment of dividends (other than stock dividends) during any fiscal year in excess of 30% of our consolidated net income for the preceding fiscal year;

• the incurrence of additional debt with certain limited exceptions; and

• the creation or existence of mortgages or liens, other than those in the ordinary course of business, on any of our properties, except in favor of our lenders.

The credit agreement also requires that we have at the end of each quarter:

• a current ratio (as defined in the credit agreement) of not less than 1 to 1; and

• a leverage ratio of funded debt to consolidated EBITDA (as defined in the credit agreement) for the most recently ended rolling four fiscal quarters of no greater than 4 to 1.

As of December 31, 2015, we were in compliance with the covenants contained in the credit agreement.

6.625% Senior Subordinated Notes. We have an aggregate principal amount of $650.0 million, 6.625% senior subordinated notes (the Notes). Interest on the Notes is payable semi-annually (in arrears) on May 15 and November 15 of each year. The Notes will mature on May 15, 2021. In connection with the issuance of the Notes, we incurred $14.7 million of fees that are being amortized as debt issuance cost over the life of the Notes.

The Notes are subject to an Indenture dated as of May 18, 2011, between us and Wilmington Trust, National Association (successor to Wilmington Trust FSB), as Trustee (the Trustee), as supplemented by the First Supplemental Indenture dated as of May 18, 2011, between us, the Guarantors, and the Trustee, and as further supplemented by the Second Supplemental Indenture dated as of January 7, 2013, between us, the Guarantors and the Trustee (as supplemented, the 2011 Indenture), establishing the terms and providing for the issuance of the Notes. The Guarantors are all of our direct and indirect subsidiaries. The discussion of the Notes in this report is qualified by and subject to the actual terms of the 2011 Indenture.

Unit, as the parent company, has no independent assets or operations. The guarantees by the Guarantors of the Notes (registered under registration statements) are full and unconditional, joint and several, subject to certain automatic customary releases, are subject to certain restrictions on the sale, disposition, or transfer of the capital stock or substantially all of the assets of a subsidiary guarantor, and other conditions and terms set out in the Indenture. Any of our subsidiaries that are not Guarantors are minor. There are no significant restrictions on our ability to receive funds from our subsidiaries through dividends, loans, advances or otherwise.

At any time before May 15, 2016, we may redeem the Notes, in whole or in part, at a redemption price equal to 100% of the principal amount plus a “make whole” premium, plus accrued and unpaid interest, if any, to the redemption date. On and after May 15, 2016, we may redeem all or, from time to time, a part of the Notes at certain redemption prices, plus accrued and unpaid interest. If a “change of control” occurs, subject to certain conditions, we must offer to repurchase from each holder all or any part of that holder’s Notes at a purchase price in cash equal to 101% of the principal amount of the Notes plus accrued and unpaid interest, if any, to the date of purchase. The 2011 Indenture contains customary events of default. The 2011 Indenture also contains covenants that, among other things, limit our ability and the ability of certain of our subsidiaries to incur or guarantee additional indebtedness; pay dividends on our capital stock or redeem capital stock or subordinated indebtedness; transfer or sell assets; make investments; incur liens; enter into transactions with our affiliates; and merge or consolidate with other companies. We were in compliance with all covenants of the Notes as of December 31, 2015.

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Other Long-Term Liabilities

Other long-term liabilities consisted of the following as of December 31:

	2015		2014
	(In thousands)
ARO liability	$	98,297	$	100,567
Capital lease obligations	22,466		25,876
Workers’ compensation	16,551		17,997
Separation benefit plans	9,886		11,276
Gas balancing liability	5,047		3,623
Deferred compensation plan	4,244		4,055
Other	410		410
	156,901		163,804
Less current portion	16,560		15,019
Total other long-term liabilities	$	140,341	$	148,785

Estimated annual principal payments under the terms of debt and other long-term liabilities from 2016 through 2020 are $16.6 million, $5.7 million, $59.9 million, $9.5 million, and $290.0 million, respectively.

Capital Leases

During 2014, our mid-stream segment entered into capital lease agreements for twenty compressors with initial terms of seven years. The underlying assets are included in gas gathering and processing equipment. The current portion of our capital lease obligations of $3.5 million is included in current portion of other long-term liabilities and the non-current portion of $18.9 million is included in other long-term liabilities in the accompanying Consolidated Balance Sheets as of December 31, 2015. These capital leases are discounted using annual rates of 4.0%. Total maintenance and interest remaining related to these leases are $9.4 million and $2.7 million, respectively at December 31, 2015. Annual payments, net of maintenance and interest, average $4.0 million annually through 2021. At the end of the term, our mid-stream segment has the option to purchase the assets at 10% of the fair market value of the assets at that time.

Future payments required under the capital leases at December 31, 2015 are as follows:

	Amount
Ending December 31,	(In thousands)
2016	$	6,168
2017	6,168
2018	6,168
2019	6,168
2020	6,168
2021	3,769
Total future payments	34,609
Less payments related to:
Maintenance	9,445
Interest	2,698
Present value of future minimum payments	$	22,466

NOTE 7 – ASSET RETIREMENT OBLIGATIONS

We are required to record the estimated fair value of the liabilities relating to the future retirement of our long-lived assets (AROs). Our oil and natural gas wells are plugged and abandoned when the oil and natural gas reserves in those wells are

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depleted or the wells are no longer able to produce. The plugging and abandonment liability for a well is recorded in the period in which the obligation is incurred (at the time the well is drilled or acquired). None of our assets are restricted for purposes of settling these AROs. All of our AROs relate to plugging costs associated with our oil and gas wells.

The following table shows certain information about our AROs for the periods indicated:

	2015			2014
	(In thousands)
ARO liability, January 1:	$	100,567		$	133,657
Accretion of discount	3,453			4,599
Liability incurred	6,754			6,246
Liability settled	(2,893		)	(4,490		)
Liability sold	(421		)	(1,206		)
Revision of estimates (1)	(9,163		)	(38,239		)
ARO liability, December 31:	98,297			100,567
Less current portion	3,965			3,204
Total long-term ARO liability	$	94,332		$	97,363

_________________________

(1) Plugging liability estimates were revised in both 2015 and 2014 for updates in the cost of services used to plug wells over the preceding year. We had various upward and downward adjustments as well as changes in estimated timing of cash flows.

NOTE 8 – INCOME TAXES

A reconciliation of income tax expense (benefit), computed by applying the federal statutory rate to pre-tax income (loss) to our effective income tax expense (benefit) is as follows:

	2015			2014		2013
	(In thousands)
Income tax expense (benefit) computed by applying the statutory rate	$	(582,508	)	$	78,029	$	105,514
State income tax, net of federal benefit	(45,768		)	6,131		8,290
Statutory depletion and other	1,328			2,503		2,919
Income tax expense (benefit)	$	(626,948	)	$	86,663	$	116,723

For the periods indicated, the total provision for income taxes consisted of the following:

	2015			2014		2013
	(In thousands)
Current taxes:
Federal	$	(20,612	)	$	8,594	$	15,845
State	(4		)	784		146
	(20,616		)	9,378		15,991
Deferred taxes:
Federal	(535,691		)	68,360		87,839
State	(70,641		)	8,925		12,893
	(606,332		)	77,285		100,732
Total provision	$	(626,948	)	$	86,663	$	116,723

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Deferred tax assets and liabilities are comprised of the following at December 31:

	2015			2014
	(In thousands)
Deferred tax assets:
Allowance for losses and nondeductible accruals	$	56,479		$	55,231
Net operating loss carryforward	140,863			54,901
Alternative minimum tax and research and development tax credit carryforward	5,409			25,991
	202,751			136,123
Deferred tax liability:
Depreciation, depletion, amortization, and impairment	(464,295		)	(1,000,811		)
Net deferred tax liability	(261,544		)	(864,688		)
Current deferred tax asset	14,206			11,527
Non-current—deferred tax liability	$	(275,750	)	$	(876,215	)

Realization of the deferred tax assets are dependent on generating sufficient future taxable income. Although realization is not assured, management believes it is more likely than not that the deferred tax asset will be realized. The amount of the deferred tax asset considered realizable, however, could be reduced in the near-term if estimates of future taxable income are reduced. At December 31, 2015, we have federal net operating loss carryforwards of approximately $351.4 million which expire from 2021 to 2035.

We file income tax returns in the U.S. federal jurisdiction and various states. We are no longer subject to U.S. federal or state income tax examinations by tax authorities for years before 2012. During 2014, we recognized a tax benefit relating to a research and development tax credit carryforward in conjunction with our BOSS drilling rig activities. Due to the nature and subjectivity surrounding the research and development credit and historical challenges by the IRS against companies who claim the credit, it is our belief that the full amount of the credit may not be eventually allowed by the IRS once we are no longer in an AMT tax paying position. A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows:

	2015		2014		2013
	(In thousands)
Balance at January 1:	$	410	$	—	$	—
Additions based on tax positions related to current year	—		410		—
Additions for tax positions of prior years	—		—		—
Reductions for tax positions of prior years	—		—		—
Settlements	—		—		—
Balance at December 31:	$	410	$	410	$	—

At December 31, 2015 and 2014, there was $0.4 million of unrecognized tax benefits that if recognized would affect the annual effective tax rate. We did not have any unrecognized tax benefits in 2013.

NOTE 9 – EMPLOYEE BENEFIT PLANS

Under our 401(k) Employee Thrift Plan, employees who meet specified service requirements may contribute a percentage of their total compensation, up to a specified maximum, to the plan. We may match each employee’s contribution, up to a specified maximum, in full or on a partial basis. We made discretionary contributions under the plan of 235,104, 120,333, and 111,995 shares of common stock and recognized expense of $6.2 million, $5.2 million, and $6.0 million in 2015, 2014, and 2013, respectively.

We provide a salary deferral plan (Deferral Plan) which allows participants to defer the recognition of salary for income tax purposes until actual distribution of benefits which occurs at either termination of employment, death or certain defined unforeseeable emergency hardships. The liability recorded under the Deferral Plan at December 31, 2015 and 2014 was $4.2 million and $4.1 million, respectively. We recognized payroll expense and recorded a liability at the time of deferral.

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Effective January 1, 1997, we adopted a separation benefit plan (Separation Plan). The Separation Plan allows eligible employees whose employment is involuntarily terminated or, in the case of an employee who has completed 20 years of service, voluntarily or involuntarily terminated, to receive benefits equivalent to four weeks salary for every whole year of service completed up to a maximum of 104 weeks. To receive payments, the recipient must waive any claims against us in exchange for receiving the separation benefits. On October 28, 1997, we adopted a Separation Benefit Plan for Senior Management (Senior Plan). The Senior Plan provides certain officers and key executives of Unit with benefits generally equivalent to the Separation Plan. The Compensation Committee of the Board of Directors has absolute discretion in the selection of the individuals covered in this plan. On May 5, 2004 we also adopted the Special Separation Benefit Plan (Special Plan). This plan is identical to the Separation Benefit Plan with the exception that the benefits under the plan vest on the earliest of a participant’s reaching the age of 65 or serving 20 years with the company.

On December 31, 2008, we amended all three Plans to be in compliance with Section 409A of the Internal Revenue Code of 1986, as amended. The key amendments to the Plans address, among other things, when distributions may be made, the timing of payments, and the circumstances under which employees become eligible to receive benefits. On December 8, 2015, we amended the Plans to change the calculation for determining the payouts at the time of a Separation of Service under the Plans. None of the amendments materially increase the benefits, grants or awards issuable under the Plans. We recognized expense of $3.0 million, $2.7 million, and $2.4 million in 2015, 2014, and 2013, respectively, for benefits associated with anticipated payments from these separation plans.

We have entered into key employee change of control contracts with three of our current executive officers. These severance contracts have an initial three-year term that is automatically extended for one year on each anniversary, unless a notice not to extend is given by us. If a change of control of the company, as defined in the contracts, occurs during the term of the severance contract, then the contract becomes operative for a fixed three-year period. The severance contracts generally provide that the executive’s terms and conditions for employment (including position, work location, compensation, and benefits) will not be adversely changed during the three-year period after a change of control. If the executive’s employment is terminated (other than for cause, death, or disability), the executive terminates for good reason during such three-year period, or the executive terminates employment for any reason during the 30-day period following the first anniversary of the change of control, and on certain terminations prior to a change of control or in connection with or in anticipation of a change of control, the executive is generally entitled to receive, in addition to certain other benefits, any earned but unpaid compensation; up to 2.9 times the executive’s base salary plus annual bonus (based on historic annual bonus); and the company matching contributions that would have been made had the executive continued to participate in the company’s 401(k) plan for up to an additional three years.

The severance contract provides that the executive is entitled to receive a payment in an amount sufficient to make the executive whole for any excise tax on excess parachute payments imposed under Section 4999 of the Code. As a condition to receipt of these severance benefits, the executive must remain in the employ of the company prior to change of control and render services commensurate with his position.

NOTE 10 – TRANSACTIONS WITH RELATED PARTIES

Unit Petroleum Company serves as the general partner of 15 oil and gas limited partnerships. Two investments by third parties and 13 (the employee partnerships) were formed to allow certain of our qualified employees and our directors to participate in Unit Petroleum’s oil and gas exploration and production operations. The non-employee partnerships were formed in 1984 and two in 1986. Effective December 31, 2014, the 1984 partnership was dissolved. Employee partnerships were formed for each year beginning with 1984 and ending with 2011.

The employee partnerships formed in 1984 through 1990 were consolidated into a single consolidating partnership in 1993 and the employee partnerships formed in 1991 through 1999 were also consolidated into the consolidating partnership in 2002. The consolidation of the 1991 through the 1999 employee partnerships was done by the general partners under the authority contained in the respective partnership agreements and did not involve any vote, consent or approval by the limited partners. The employee partnerships have each had a set percentage (ranging from 1% to 15%) of our interest in most of the oil and natural gas wells we drill or acquire for our own account during the particular year for which the partnership was formed. The total interest the employees have in our oil and natural gas wells by participating in these partnerships does not exceed one percent.

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Amounts received in the years ended December 31, from both public and private Partnerships for which Unit is a general partner are as follows:

	2015		2014		2013
	(In thousands)
Contract drilling	$	—	$	4	$	16
Well supervision and other fees	423		435		470
General and administrative expense reimbursement	18		39		36

Related party transactions for contract drilling and well supervision fees are the related party’s share of such costs. These costs are billed to related parties on the same basis as billings to unrelated parties for such services. General and administrative reimbursements are both direct general and administrative expense incurred on the related party’s behalf and indirect expenses allocated to the related parties. Such allocations are based on the related party’s level of activity and are considered by management to be reasonable.

The Chairman of our Board, John Nikkel is a 25.8% owner of Rampart Holdings, Inc. which owns 100% of Toklan Oil and Gas Company (Toklan), an oil and gas exploration and production company located in Tulsa, Oklahoma. Mr. Nikkel's son, Robert Nikkel is Toklan's President, and he owns 20.0% of the company. In 2014, there were two wells drilled for Toklan, one of which was completed in 2014 and one of which was completed in 2015 with no activity in 2013. Under its usual standard dayrate contract terms available generally to all similarly-situated customers at that time and in the same general drilling area, the Company recognized revenue from Toklan of approximately $0.5 million in 2015 and $1.5 million in 2014. During 2014, we received payments of $1.1 million and had an accounts receivable balance of $0.4 million at December 31, 2014. During 2015, we received payments of $0.9 million with no accounts receivable balance at December 31, 2015. The Company also paid royalties in 2014, in the ordinary course of business, of approximately $0.2 million to Toklan. There were no material royalties to disclose for 2013 or 2015. Also in 2015, Toklan paid $0.5 million for the North Custer Gathering System, an inactive (since 2009) gathering system owned by our mid-stream segment. We determined that the capital required to re-activate that system would not provide adequate returns based on future cash flow potential. If the system had not been sold to Toklan, it would have been included in a multi-system asset sales package in which little value would have been assigned to it. Toklan operates the North Custer Gathering System under its affiliate, West Thomas Field Services, LLC (West Thomas), a company in which Mr. John Nikkel holds an approximate 25.0% ownership interest and in which Mr. Robert Nikkel has an ownership interest of approximately 20.0%. West Thomas entered into a gas purchase agreement with our exploration and production segment in November of 2015. Payments from West Thomas under that contract amounted to $0.1 million for 2015 volumes purchased.

One of our directors, G. Bailey Peyton IV, also serves as Manager of Peyton Royalties, LP, a family-controlled limited partnership that owns royalty rights in wells in the Texas and Oklahoma Panhandles. The Company in the ordinary course of business, paid royalties or lease bonuses, primarily due to its status as successor in interest to prior transactions and as operator of the wells involved and, in some cases, as lessee, with respect to certain wells in which Mr. Peyton, members of Mr. Peyton's family, and Peyton Royalties, LP have an interest. Such payments totaled approximately $0.8 million, $1.3 million, and $1.4 million during 2015, 2014, and 2013, respectively. 

Our Audit Committee and the board, in accordance with our related party transaction policy, have determined that these arrangements are in the best interest of the Company.

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NOTE 11 – STOCK-BASED COMPENSATION

For restricted stock awards, we had:

	2015 (1)		2014		2013
	(In millions)
Recognized stock compensation expense	$	15.3	$	17.4	$	16.1
Capitalized stock compensation cost for our oil and natural gas properties	3.5		3.7		3.5
Tax benefit on stock based compensation	5.8		6.7		6.2

_________________________

(1) Recognized stock compensation was reduced by $3.2 million, capitalized stock compensation cost for our oil and natural gas properties was reduced by $0.2 million, and the tax benefit was reduced by $1.2 million for lower expected payouts related to the performance shares.

The remaining unrecognized compensation cost related to unvested awards at December 31, 2015 is approximately $13.8 million of which $2.4 million is anticipated to be capitalized. The weighted average period of time over which this cost will be recognized is 0.7 of a year.

The Second Amended and Restated Unit Corporation Stock and Incentive Compensation Plan effective May 6, 2015 (the amended plan) allows us to grant stock-based and cash-based compensation to our employees (including employees of subsidiaries) as well as to non-employee directors. A total of 4,500,000 shares of the company's common stock is authorized for issuance to eligible participants under the amended plan with 2.0 million shares being the maximum number of shares that can be issued as “incentive stock options.” Awards under this plan may be granted in any one or a combination of the following:

• incentive stock options under Section 422 of the Internal Revenue Code;

• non-qualified stock options;

• performance shares;

• performance units;

• restricted stock;

• restricted stock units;

• stock appreciation rights;

• cash based awards; and

• other stock-based awards.

This plan also contains various limits as to the amount of awards that can be given to an employee in any fiscal year. All awards are generally subject to the minimum vesting periods, as determined by our Compensation Committee and included in the award agreement.

Expected volatilities are based on the historical volatility of our stock. We use historical data to estimate option exercise and termination rates within the model and aggregate groups that have similar historical exercise behavior for valuation purposes. To date, we have not paid dividends on our stock. The risk free interest rate is computed from the United States Treasury Strips rate using the term over which it is anticipated the grant will be exercised.

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SARs

Activity pertaining to SARs granted under the amended plan is as follows:

	Number of Shares		Weighted Average Price
Outstanding at January 1, 2013	145,901		$	46.59
Granted	—		—
Exercised	—		—
Forfeited	—		—
Outstanding at December 31, 2013	145,901		46.59
Granted	—		—
Exercised	(14,131	)	46.50
Forfeited	—		—
Outstanding at December 31, 2014	131,770		46.60
Granted	—		—
Exercised	—		—
Forfeited	—		—
Outstanding at December 31, 2015	131,770		$	46.60

There were no SARs granted or vested during 2015, 2014, or 2013.

	Outstanding and Exercisable SARs at December 31, 2015
Exercise Prices	Number  of Shares	Weighted Average Remaining Contractual Life	Weighted Average Exercise Price
$44.31	91,255	2.0 years	$44.31
$51.76	40,515	0.9 years	$51.76

There were no SARs exercised in 2015. The SARs expire after 10 years from the date of the grant. There was no aggregate intrinsic value on the 131,770 shares outstanding at December 31, 2015. The remaining weighted average contractual term is 1.6 years.

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Restricted Stock

Activity pertaining to restricted stock awards granted under the amended plan is as follows:

Employees	Number of Time Vested Shares		Number of Performance Vested Shares		Total Number of Shares		Weighted Average Price
Nonvested at January 1, 2013	523,024		66,503		589,527		$	48.11
Granted	396,144		57,405		453,549		48.20
Vested	(248,003	)	—		(248,003	)	46.46
Forfeited	(18,330	)	—		(18,330	)	47.85
Nonvested at December 31, 2013	652,835		123,908		776,743		48.70
Granted	383,448		71,674		455,122		53.72
Vested	(291,712	)	(13,092	)	(304,804	)	49.68
Forfeited	(19,805	)	(6,970	)	(26,775	)	51.92
Nonvested at December 31, 2014	724,766		175,520		900,286		50.81
Granted	576,361		148,081		724,442		34.06
Vested	(343,657	)	(39,245	)	(382,902	)	49.69
Forfeited	(20,808	)	(7,196	)	(28,004	)	45.33
Nonvested at December 31, 2015	936,662		277,160		1,213,822		$	41.29

Non-Employee Directors	Number of Shares		Weighted Average Price
Nonvested at January 1, 2013	24,606		$	40.23
Granted	21,128		41.65
Vested	(10,030	)	40.23
Forfeited	—		—
Nonvested at December 31, 2013	35,704		$	41.07
Granted	13,768		63.91
Vested	(14,336	)	40.93
Forfeited	—		—
Nonvested at December 31, 2014	35,136		$	50.08
Granted	25,848		34.04
Vested	(18,920	)	46.51
Forfeited	—		—
Nonvested at December 31, 2015	42,064		$	41.83

The time vested restricted stock awards granted are being recognized over a three year vesting period. The performance vested restricted stock awards, granted to certain executive officers, will cliff vest three years from the grant date based on the company's achievement of certain stock performance measures at the end of the term and will range from 0% to 150% of the restricted shares granted as performance shares. Based on a probability assessment of the selected performance criteria at December 31, 2015, the participants are estimated to receive 2% of the 2015, 57% of the 2014, and 10% of the 2013 performance based shares.

The fair value of the restricted stock granted in 2015, 2014, and 2013 at the grant date was $24.5 million, $24.1 million, and $21.3 million, respectively. The aggregate intrinsic value of the 401,822 shares of restricted stock that vested in 2015 on their vesting date was $11.2 million. The aggregate intrinsic value of the 1,255,886 shares of restricted stock outstanding subject to vesting at December 31, 2015 was $15.3 million with a weighted average remaining life of 0.7 of a year.

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Employee Stock Option Plan

The Stock Option Plan, provided the granting of options for up to 2,700,000 shares of common stock to officers and employees. The option plan permitted the issuance of qualified or nonqualified stock options. Options granted typically became exercisable at the rate of 20% per year one year after being granted and expire after 10 years from the original grant date. The exercise price for options granted under this plan was the fair market value of the common stock on the date of the grant. In 2006, as a result of the approval of the adoption of the Unit Corporation Stock and Incentive Compensation Plan, no further awards were made under this plan. During 2015, the remaining options expired.

Activity pertaining to the Stock Option Plan is as follows:

	Number of Shares		Weighted Average Exercise Price
Outstanding at January 1, 2013	118,030		$	33.03
Granted	—		—
Exercised	(48,110	)	26.09
Forfeited	(1,000	)	37.83
Outstanding at December 31, 2013	68,920		37.81
Granted	—		—
Exercised	(21,490	)	37.83
Forfeited	(37,930	)	37.83
Outstanding at December 31, 2014	9,500		37.69
Granted	—		—
Exercised	—		—
Forfeited	(9,500	)	37.69
Outstanding at December 31, 2015	—		$	—

There were no shares that vested in 2015, 2014, or 2013. There were no options exercised in 2015 and no options outstanding or exercisable in this plan at December 31, 2015.

Non-Employee Directors' Stock Option Plan

Under the Unit Corporation 2000 Non-Employee Directors’ Stock Option Plan, on the first business day following each annual meeting of shareholders, each person who was then a member of our Board of Directors and who was not then an employee of the company or any of its subsidiaries was granted an option to purchase 3,500 shares of common stock. The option price for each stock option was the fair market value of the common stock on the date the stock options were granted. The term of each option is 10 years and cannot be increased and no stock options were to be exercised during the first six months of its term except in case of death. On May 2, 2012, our stockholders approved the amended plan which succeeds this plan, and no further awards were made under the non-employee director option plan.

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Activity pertaining to the Directors’ Plan is as follows:

	Number of Shares		Weighted Average Exercise Price
Outstanding at January 1, 2013	192,500		$	49.39
Granted	—		—
Exercised	(17,500	)	32.53
Forfeited	(3,500	)	20.46
Outstanding at December 31, 2013	171,500		51.70
Granted	—		—
Exercised	(21,000	)	33.94
Forfeited	—		—
Outstanding at December 31, 2014	150,500		54.18
Granted	—		—
Exercised	—		—
Forfeited	(21,000	)	54.35
Outstanding at December 31, 2015	129,500		$	54.15

There were no options exercised in 2015.

	Outstanding and Exercisable Options at December 31, 2015
Weighted Average Exercise Price	Number  of Shares	Weighted Average Remaining Contractual Life	Weighted Average Exercise Price
$31.30 - $41.21	38,500	3.9 years	$	37.58
$53.81 - $73.26	91,000	2.6 years	$	61.16

There was no aggregate intrinsic value of the shares outstanding subject to options at December 31, 2015. The remaining weighted average remaining contractual term is 3.0 years.

NOTE 12 – DERIVATIVES

Commodity Derivatives

We have entered into various types of derivative transactions covering some of our projected natural gas, NGLs, and oil production. These transactions are intended to reduce our exposure to market price volatility by setting the price(s) we will receive for that production. Our decisions on the price(s), type, and quantity of our production subject to a derivative contract is based, in part, on our view of current and future market conditions. As of December 31, 2015, our derivative transactions consisted of the following types of hedges:

• Swaps. We receive or pay a fixed price for the commodity and pay or receive a floating market price to the counterparty. The fixed-price payment and the floating-price payment are netted, resulting in a net amount due to or from the counterparty.

• Collars. A collar contains a fixed floor price (put) and a ceiling price (call). If the market price exceeds the call strike price or falls below the put strike price, we receive the fixed price and pay the market price. If the market price is between the call and the put strike price, no payments are due from either party.

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• Three-way collars. A three-way collar contains a fixed floor price (long put), fixed subfloor price (short put) and a fixed ceiling price (short call). If the market price exceeds the ceiling strike price, we receive the ceiling strike price and pay the market price. If the market price is between the ceiling and the floor strike price, no payments are due from either party. If the market price is below the floor price but above the subfloor price, we receive the floor strike price and pay the market price. If the market price is below the subfloor price, we receive the market price plus the difference between the floor and subfloor strike prices and pay the market price.

We have documented policies and procedures to monitor and control the use of derivative instruments. We do not engage in derivative transactions for speculative purposes. In August 2012, we determined–on a prospective basis–that we would no longer elect to use cash flow hedge accounting for our economic hedges. As a result, the change in fair value, on all commodity derivatives entered into after that determination, is reflected in the statement of operations and not in accumulated other comprehensive income (OCI). As of December 31, 2013, all cash flow hedges had expired.

At December 31, 2015, the following non-designated hedges were outstanding:

Term	Commodity	Contracted Volume	Weighted Average  Fixed Price for Swaps	Contracted Market
Jan’16 – Dec’16	Natural gas – swap	35,000 MMBtu/day	$2.625	IF – NYMEX (HH)
Jan’16 – Dec'16	Natural gas – collar	42,000 MMBtu/day	$2.40 - $2.88	IF – NYMEX (HH)
Jan’16 – Dec'16	Natural gas – three-way collar	13,500 MMBtu/day	$2.70 - $2.20 - $3.26	IF – NYMEX (HH)
Jan’17 – Dec'17	Natural gas – three-way collar	15,000 MMBtu/day	$2.50 - $2.00 - $3.32	IF – NYMEX (HH)
Jan’16 – Jun'16	Crude oil – collar	2,150 Bbl/day	$46.36 - $55.62	WTI – NYMEX
Jul’16 – Dec'16	Crude oil – collar	1,450 Bbl/day	$47.50 - $56.40	WTI – NYMEX
Jan’16 – Dec'16	Crude oil – three-way collar	700 Bbl/day	$46.50 - $35.00 - $57.00	WTI – NYMEX
Jul’16 – Dec'16	Crude oil – three-way collar (1)	700 Bbl/day	$47.50 - $35.00 - $63.50	WTI – NYMEX
Jan’17 – Dec'17	Crude oil – three-way collar	750 Bbl/day	$50.00 - $37.50 - $63.90	WTI – NYMEX

_________________________

(1) We pay our counterparty a premium, which can be and is being deferred until settlement.

Subsequent to December 31, 2015, the following non-designated hedges were entered into:

Term	Commodity	Contracted Volume	Weighted Average  Fixed Price for Swaps	Contracted Market
Feb’16 – Dec'16	Natural gas – swap	10,000 MMBtu/day	$2.495	IF – NYMEX (HH)
Jan’17 – Dec'17	Natural gas – swap	10,000 MMBtu/day	$2.795	IF – NYMEX (HH)

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The following tables present the fair values and locations of the derivative transactions recorded in our Consolidated Balance Sheets at December 31:

		Derivative Assets Fair Value
	Balance Sheet Location	2015		2014
		(In thousands)
Commodity derivatives:
Current	Current derivative assets	$	10,186	$	31,139
Long-term	Non-current derivative assets	968		—
Total derivative assets		$	11,154	$	31,139

		Derivative Liabilities Fair Value
	Balance Sheet Location	2015		2014
		(In thousands)
Commodity derivatives:
Current	Current derivative liabilities	$	—	$	—
Long-term	Non-current derivative liabilities	285		—
Total derivative liabilities		$	285	$	—

If a legal right of set-off exists, we net the value of the derivative transactions we have with the same counterparty in our Consolidated Balance Sheets.

For hedges designated under cash flow accounting, we recognized in OCI the effective portion of any changes in fair value and reclassified the recognized gains (losses) on the sales to oil and natural gas revenue as the underlying transactions were settled. Because our cash flow hedges expired as of December 31, 2013, we had no balance in accumulated OCI at December 31, 2015 or 2014.

Effect of Derivative Instruments on the Consolidated Statements of Operations (derivatives not designated as hedging instruments) for the year ended December 31:

Derivatives Not Designated as Hedging Instruments	Location of Gain or (Loss) Recognized in Income on Derivative	Amount of Gain or (Loss) Recognized in Income on  Derivative
		2015		2014
		(In thousands)
Commodity derivatives	Gain on derivatives not designated as hedges and hedge ineffectiveness, net (1)	$	26,345	$	30,147
Total		$	26,345	$	30,147

_________________________

(1) Amount settled during the period is a gain of $46,615 and a loss of $6,038, respectively.

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NOTE 13 – FAIR VALUE MEASUREMENTS

Fair value is defined as the amount that would be received from the sale of an asset or paid for the transfer of a liability in an orderly transaction between market participants (in either case, an exit price). To estimate an exit price, a three-level

hierarchy is used prioritizing the valuation techniques used to measure fair value into three levels with the highest priority given to Level 1 and the lowest priority given to Level 3. The levels are summarized as follows:

• Level 1—unadjusted quoted prices in active markets for identical assets and liabilities.

• Level 2—significant observable pricing inputs other than quoted prices included within level 1 that are either directly or indirectly observable as of the reporting date. Essentially, inputs (variables used in the pricing models) that are derived principally from or corroborated by observable market data.

• Level 3—generally unobservable inputs which are developed based on the best information available and may include our own internal data.

The inputs available to us determine the valuation technique we use to measure the fair values of our financial instruments.

The following tables set forth our recurring fair value measurements:

	December 31, 2015
	Level 2			Level 3			Effect of Netting			Total
	(In thousands)
Financial assets (liabilities):
Commodity derivatives:
Assets	$	2,794		$	10,145		$	(1,785	)	$	11,154
Liabilities	(1,019		)	(1,051		)	1,785			(285		)
	$	1,775		$	9,094		$	—		$	10,869

	December 31, 2014
	Level 2		Level 3		Effect of Netting		Total
	(In thousands)
Financial assets (liabilities):
Commodity derivatives:
Assets	$	27,784	$	3,355	$	—	$	31,139
Liabilities	—		—		—		—
	$	27,784	$	3,355	$	—	$	31,139

All of our counterparties are subject to master netting arrangements. If a legal right of set-off exists, we net the value of the derivative transactions we have with the same counterparty. We are not required to post any cash collateral with our counterparties and no collateral has been posted as of December 31, 2015.

The following methods and assumptions were used to estimate the fair values of the assets and liabilities in the table above.

Level 2 Fair Value Measurements

Commodity Derivatives. We measure the fair values of our crude oil and natural gas swaps using estimated internal discounted cash flow calculations based on the NYMEX futures index.

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Level 3 Fair Value Measurements

Commodity Derivatives. The fair values of our natural gas and crude oil collars are estimated using internal discounted cash flow calculations based on forward price curves, quotes obtained from brokers for contracts with similar terms, or quotes obtained from counterparties to the agreements.

The following tables are reconciliations of our level 3 fair value measurements:

	Net Derivatives
	For the Year Ended,
	December 31, 2015			December 31, 2014
	(In thousands)
Beginning of period	$	3,355		$	(2,595	)
Total gains or losses:
Included in earnings (1)	15,260			6,108
Settlements	(9,521		)	(158		)
End of period	$	9,094		$	3,355
Total gains for the period included in earnings attributable to the change in unrealized loss relating to assets still held at end of period	$	5,739		$	5,950

_________________________

(1) Commodity derivatives are reported in the Consolidated Statements of Operations in gain (loss) on derivatives not designated as hedges and hedge ineffectiveness, net.

The following table provides quantitative information about our Level 3 unobservable inputs at December 31, 2015:

Commodity (1)	Fair Value		Valuation Technique	Unobservable Input	Range
	(In thousands)
Oil collars	$	3,893	Discounted cash flow	Forward commodity price curve	$0.40 - $55.05
Oil three-way collar	3,470		Discounted cash flow	Forward commodity price curve	$0.40 - $71.66
Natural gas collar	1,000		Discounted cash flow	Forward commodity price curve	$0.40 - $1.26
Natural gas three-way collar	731		Discounted cash flow	Forward commodity price curve	$0.40 - $1.93

 _________________________

(1) The commodity contracts detailed in this category include non-exchange-traded crude oil and natural gas collars and three-way collars that are valued based on NYMEX. The forward pricing range represents the low and high price expected to be received within the settlement period.

Based on our valuation at December 31, 2015, we determined that the non-performance risk with regard to our counterparties was immaterial.

Fair Value of Other Financial Instruments

The following disclosure of the estimated fair value of financial instruments is made in accordance with accounting guidance for financial instruments. We have determined the estimated fair values by using available market information and valuation methodologies. Considerable judgment is required in interpreting market data to develop the estimates of fair value. The use of different market assumptions or valuation methodologies may have a material effect on the estimated fair value amounts.

At December 31, 2015, the carrying values on the consolidated balance sheets for cash and cash equivalents (classified as Level 1), accounts receivable, accounts payable, other current assets, and current liabilities approximate their fair value because of their short term nature.

Based on the borrowing rates currently available to us for credit agreement debt with similar terms and maturities and also considering the risk of our non-performance, long-term debt under our credit agreement at December 31, 2015 approximates its fair value. This debt would be classified as Level 2.

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UNIT CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

The carrying amounts of long-term debt, net of unamortized discount, associated with the Notes reported in the Consolidated Balance Sheets at December 31, 2015 and December 31, 2014 were $646.7 million and $646.2 million, respectively. We estimate the fair value of these Notes using quoted marked prices at December 31, 2015 and December 31, 2014 were $455.5 million and $605.5 million, respectively. These Notes would be classified as Level 2.

Fair Value of Non-Financial Instruments

The initial measurement of AROs at fair value is calculated using discounted cash flow techniques and based on internal estimates of future retirement costs associated with property, plant, and equipment. Significant Level 3 inputs used in the calculation of AROs include plugging costs and remaining reserve lives. A reconciliation of the Company’s AROs is presented in Note 7 – Asset Retirement Obligations.

Non-recurring fair value measurements are also applied, when applicable, to determine the fair value of our long-lived assets and goodwill. During 2015 and 2014, we recorded non-cash impairment charges discussed further in Note 2 – Summary of Significant Accounting Policies. The valuation of these assets require the use of significant unobservable inputs classified as Level 3. 

NOTE 14 – ACCUMULATED OTHER COMPREHENSIVE INCOME

Changes in accumulated other comprehensive income (loss) by component, net of tax, are as follows:

	Net Gains (Losses) on Cash Flow Hedges
	2015		2014		2013
	(In thousands)
Balance at January 1:	$	—	$	—	$	7,587
Other comprehensive income before reclassification	—		—		(7,349		)
Amounts reclassified from accumulated other comprehensive income	—		—		(238		)
New current-period other comprehensive income	—		—		(7,587		)
Balance at December 31:	$	—	$	—	$	—

Amounts reclassified from accumulated other comprehensive income (loss) into the Consolidated Statements of Operations for the year ended December 31:

	2015		2014		2013			Affected Line Item in the Statement Where Net Income is Presented
	(In thousands)
Net gains (loss) on cash flow hedges
Commodity derivatives	$	—	$	—	$	603		Oil and natural gas revenues
Commodity derivatives	—		—		(190		)	Gain (loss) on derivatives not designated as hedges and hedge ineffectiveness, net
	—		—		413			Total before tax
	—		—		(175		)	Tax expense
Total reclassification for the period	$	—	$	—	$	238		Net of tax

NOTE 15 – COMMITMENTS AND CONTINGENCIES

We lease office space or yards in Edmond, Oklahoma City, and Tulsa, Oklahoma; Houston, Texas; Englewood, Colorado; Pinedale, Wyoming; and Pittsburgh, Pennsylvania under the terms of operating leases expiring through December 2021. Additionally, we have several compressor rentals, equipment leases, and lease space on short-term commitments to stack excess drilling rig equipment and production inventory.Future minimum rental payments under the terms of the leases are approximately $6.4 million, $1.0 million, and $0.7 million, in 2016 through 2018, respectively and less than $0.1 million each

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UNIT CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

in 2019 and 2020. Total rent expense incurred was $12.9 million, $13.6 million, and $16.9 million in 2015, 2014, and 2013, respectively.

During 2014, our mid-stream segment entered into capital lease agreements for twenty compressors with initial terms of seven years. Future capital lease payments under the terms are approximately $6.2 million each year through 2020 and approximately $3.8 million in 2021. Total maintenance and interest remaining related to these leases are $9.4 million and $2.7 million, respectively at December 31, 2015. Annual payments, net of maintenance and interest, average $4.0 million annually

through 2021. At the end of the term, our mid-stream segment has the option to purchase the assets at 10% of the fair market value of the assets at that time.

The Unit 1984 Oil and Gas Limited Partnership and the 1986 Energy Income Limited Partnership agreements along with the employee oil and gas limited partnerships require, on the election of a limited partner, that we repurchase the limited partner’s interest at amounts to be determined by appraisal in the future. These repurchases in any one year are limited to 20% of the units outstanding. We made repurchases of $118,000, $45,000, $16,000 in 2015, 2014, and 2013, respectively. Effective December 31, 2014, the Unit 1984 Oil and Gas Limited Partnership was dissolved.

We manage our exposure to environmental liabilities on properties to be acquired by identifying existing problems and assessing the potential liability. We also conduct periodic reviews, on a company-wide basis, to identify changes in our environmental risk profile. These reviews evaluate whether there is a probable liability, its amount, and the likelihood that the liability will be incurred. The amount of any potential liability is determined by considering, among other matters, incremental direct costs of any likely remediation and the proportionate cost of employees who are expected to devote a significant amount of time directly to any possible remediation effort. As it relates to evaluations of purchased properties, depending on the extent of an identified environmental problem, we may exclude a property from the acquisition, require the seller to remediate the property to our satisfaction, or agree to assume liability for the remediation of the property.

We have not historically experienced any environmental liability while being a contract driller since the greatest portion of risk is borne by the operator. Any liabilities we have incurred have been small and have been resolved while the drilling rig is on the location and the cost has been included in the direct cost of drilling the well.

For 2016, we have committed to purchase approximately $6.7 million of new drilling rig components, drill pipe, drill collars, and related equipment. We have also committed to paying $1.4 million for Enterprise Resource Planning software over the next year and then $0.5 million for maintenance one year following implementation.

We are subject to various legal proceedings arising in the ordinary course of our various businesses none of which, in our opinion, will result in judgments which would have a material adverse effect on our financial position, operating results or cash flows.

NOTE 16 – INDUSTRY SEGMENT INFORMATION

We have three main business segments offering different products and services:

• Oil and natural gas,

• Contract drilling, and

• Mid-stream

The oil and natural gas segment is engaged in the development, acquisition, and production of oil, NGLs, and natural gas properties. The contract drilling segment is engaged in the land contract drilling of oil and natural gas wells and the mid-stream segment is engaged in the buying, selling, gathering, processing, and treating of natural gas and NGLs.

We evaluate each segment’s performance based on its operating income, which is defined as operating revenues less operating expenses and depreciation, depletion, amortization, and impairment. Our oil and natural gas production outside the United States is not significant.

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UNIT CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

The following table provides certain information about the operations of each of our segments:

	2015				2014				2013
	(In thousands)
Revenues:
Oil and natural gas	$	385,774			$	740,079			$	649,718
Contract drilling	287,767				566,012				479,091
Elimination of inter-segment revenue	(22,099		)		(89,495		)		(64,313		)
Contract drilling net of inter-segment revenue	265,668				476,517				414,778
Gas gathering and processing	268,012				445,934				378,397
Elimination of inter-segment revenue	(65,223		)		(89,586		)		(91,043		)
Gas gathering and processing net of inter-segment revenue	202,789				356,348				287,354
Total revenues	$	854,231			$	1,572,944			$	1,351,850
Operating income (loss):
Oil and natural gas	$	(1,631,564	)	(4)	$	199,392		(4)	$	239,219
Contract drilling	44,811			(5)	41,896			(5)	96,304
Gas gathering and processing	(29,409		)	(6)	2,015			(6)	10,757
Total operating income (loss) (1)	(1,616,162		)		243,303				346,280
General and administrative	(35,345		)		(42,023		)		(38,323		)
Gain (loss) on disposition of assets	(7,229		)		8,953				17,076
Interest expense, net	(31,963		)		(17,371		)		(15,015		)
Gain (loss) on derivatives not designated as hedges and hedge ineffectiveness, net	26,345				30,147				(8,374		)
Other	45				(70		)		(175		)
Income (loss) before income taxes	$	(1,664,309	)		$	222,939			$	301,469
Identifiable assets:
Oil and natural gas	$	1,218,036			$	2,856,833			$	2,441,792
Contract drilling	993,015				1,059,980				1,042,661
Gas gathering and processing	478,661				500,255				473,717
Total identifiable assets (2)	2,689,712				4,417,068				3,958,170
Corporate assets	118,797				56,660				64,220
Total assets	$	2,808,509			$	4,473,728			$	4,022,390
Capital expenditures:
Oil and natural gas	$	267,944			$	740,262			$	531,233
Contract drilling	84,802				176,683				64,325
Gas gathering and processing	63,476				79,268			(3)	96,085
Other	38,065				17,067				4,483
Total capital expenditures	$	454,287			$	1,013,280			$	696,126
Depreciation, depletion, amortization, and impairment:
Oil and natural gas:
Depreciation, depletion, and amortization	$	251,944			$	276,088			$	226,498
Impairment of oil and natural gas properties	1,599,348			(4)	76,683			(4)	—
Contract drilling:
Depreciation	56,135				85,370				71,194
Impairment of contract drilling equipment	8,314			(5)	74,318			(5)	—
Gas gathering and processing:
Depreciation and amortization	43,676				40,434				33,191
Impairment of gas gathering and processing systems	26,966			(6)	7,068			(6)	—
Other	3,075				3,051				3,024
Total depreciation, depletion, amortization, and impairment	$	1,989,458			$	563,012			$	333,907

106

UNIT CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

_______________________ 

(1) Operating income (loss) is total operating revenues less operating expenses, depreciation, depletion, amortization, and impairment and does not include general corporate expenses, gain (loss) on disposition of assets, gain (loss) on non-designated hedges and hedge ineffectiveness, net, interest expense, other income (loss), or income taxes.

(2) Identifiable assets are those used in Unit’s operations in each industry segment. Corporate assets are principally cash and cash equivalents, short-term investments, corporate leasehold improvements, furniture, and equipment.

(3) In 2014, we entered into capital leases for $28.2 million.

(4) In 2015 and 2014, we incurred non-cash ceiling test write-downs of our oil and natural gas properties of $1.6 billion and $76.7 million pre-tax ($1.0 billion and $47.7 million, net of tax), respectively.

(5) Impairment for contract drilling equipment for 2015 includes a $8.3 million pre-tax write-down and 2014 includes a $74.3 million pre-tax write-down for 31 drilling rigs, some older top drives, and certain drill pipe removed from service.

(6) Impairment for gas gathering and processing systems for 2015 includes a $27.0 million pre-tax write-down for three of our systems, Bruceton Mills, Midwell, and Spring Creek. For 2014, it includes a $7.1 million pre-tax write-down for three of our systems, Weatherford, Billy Rose, and Spring Creek.

NOTE 17 – SELECTED QUARTERLY FINANCIAL INFORMATION

Summarized unaudited quarterly financial information is as follows:

	Three Months Ended
	March 31			June 30			September 30			December 31
	(In thousands except per share amounts)
2014
Revenues	$	387,988		$	405,431		$	400,974		$	378,551
Gross profit (loss) (1)	$	115,143		$	113,973		$	103,983		$	(89,796	)
Net income (loss)	$	56,945		$	54,360		$	67,522		$	(42,551	)
Net income (loss) per common share:
Basic	$	1.17		$	1.12		$	1.39		$	(0.88	)
Diluted (2)	$	1.17		$	1.11		$	1.37		$	(0.88	)
2015
Revenues	$	255,099		$	214,447		$	212,393		$	172,292
Gross loss (1)	$	(389,451	)	$	(419,666	)	$	(314,409	)	$	(492,636	)
Net loss	$	(248,354	)	$	(274,389	)	$	(205,281	)	$	(309,337	)
Net loss per common share:
Basic	$	(5.07	)	$	(5.58	)	$	(4.18	)	$	(6.29	)
Diluted	$	(5.07	)	$	(5.58	)	$	(4.18	)	$	(6.29	)

_________________________

(1) Gross profit (loss) excludes general and administrative expense, interest expense, (gain) loss on disposition of assets, gain (loss) on non-designated hedges and hedge ineffectiveness, net, income taxes, and other income (loss).

(2) Due to the effect of the loss in the fourth quarter, the diluted earnings per share for the year's four quarters does not equal annual earnings per share.

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SUPPLEMENTAL OIL AND GAS DISCLOSURES

(UNAUDITED)

Our oil and gas operations are substantially located in the United States. The capitalized costs at year-end and costs incurred during the year were as follows:

	2015			2014			2013
	(In thousands)
Capitalized costs:
Proved properties	$	5,401,618		$	4,990,753		$	4,235,712
Unproved properties	337,099			485,568			545,588
	5,738,717			5,476,321			4,781,300
Accumulated depreciation, depletion, amortization, and impairment	(4,631,404		)	(2,786,678		)	(2,439,458		)
Net capitalized costs	$	1,107,313		$	2,689,643		$	2,341,842
Cost incurred:
Unproved properties acquired	$	41,777		$	76,041		$	76,304
Proved properties acquired	179			5,723			—
Exploration	19,222			68,811			33,373
Development	208,845			615,252			424,314
Asset retirement obligation	(5,693		)	(37,687		)	(17,951		)
Total costs incurred	$	264,330		$	728,140		$	516,040

The following table shows a summary of the oil and natural gas property costs not being amortized at December 31, 2015, by the year in which such costs were incurred:

	2015		2014		2013		2012 and Prior		Total
	(In thousands)
Unproved properties acquired and wells in progress	$	49,283	$	65,970	$	44,607	$	177,239	$	337,099

Unproved properties not subject to amortization relates to properties which are not individually significant and consist primarily of lease acquisition costs. The evaluation process associated with these properties has not been completed and therefore, the company is unable to estimate when these costs will be included in the amortization calculation.

The results of operations for producing activities are as follows:

	2015			2014			2013
	(In thousands)
Revenues	$	371,335		$	723,566		$	633,792
Production costs	(152,560		)	(165,315		)	(162,822		)
Depreciation, depletion, amortization, and impairment	(1,844,726		)	(347,220		)	(222,672		)
	(1,625,951		)	211,031			248,298
Income tax (expense) benefit	612,496			(82,028		)	(96,091		)
Results of operations for producing activities (excluding corporate overhead and financing costs)	$	(1,013,455	)	$	129,003		$	152,207

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Estimated quantities of proved developed oil, NGLs, and natural gas reserves and changes in net quantities of proved developed and undeveloped oil, NGLs, and natural gas reserves were as follows:

	Oil Bbls		NGLs Bbls		Natural Gas Mcf
	(In thousands)
2013
Proved developed and undeveloped reserves:
Beginning of year	21,998		35,166		555,647
Revision of previous estimates (1)	(2,113	)	836		2,421
Extensions and discoveries	4,678		7,273		68,611
Infill reserves in existing proved fields	2,299		1,945		21,573
Purchases of minerals in place	—		—		11
Production	(3,360	)	(3,914	)	(56,757	)
Sales	(1,737	)	(101	)	(9,722	)
End of year	21,765		41,205		581,784
Proved developed reserves:
Beginning of year	16,441		25,657		452,844
End of year	15,594		30,437		464,234
Proved undeveloped reserves:
Beginning of year	5,557		9,509		102,803
End of year	6,171		10,768		117,550
2014
Proved developed and undeveloped reserves:
Beginning of year	21,765		41,205		581,784
Revision of previous estimates (1)	(3,174	)	(2,266	)	(32,790	)
Extensions and discoveries	5,327		10,850		113,541
Infill reserves in existing proved fields	2,775		3,577		47,189
Purchases of minerals in place	236		88		368
Production	(3,844	)	(4,629	)	(58,854	)
Sales	(418	)	(296	)	(4,277	)
End of year	22,667		48,529		646,961
Proved developed reserves:
Beginning of year	15,594		30,437		464,234
End of year	17,448		35,850		500,950
Proved undeveloped reserves:
Beginning of year	6,171		10,768		117,550
End of year	5,219		12,679		146,011
2015
Proved developed and undeveloped reserves:
Beginning of year	22,667		48,529		646,961
Revision of previous estimates (1)	(3,954	)	(9,367	)	(139,514	)
Extensions and discoveries	1,208		1,948		20,974
Infill reserves in existing proved fields	670		1,861		22,641
Purchases of minerals in place	—		—		—
Production	(3,783	)	(5,274	)	(65,546	)
Sales	(73	)	(10	)	(648	)
End of year	16,735		37,687		484,868
Proved developed reserves:
Beginning of year	17,448		35,850		500,950
End of year	14,679		31,218		416,395
Proved undeveloped reserves:
Beginning of year	5,219		12,679		146,011
End of year	2,056		6,469		68,473

_________________________

(1) Natural gas revisions of previous estimates decreased primarily due to a decline in natural gas prices.

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Estimates of oil, NGLs, and natural gas reserves require extensive judgments of reservoir engineering data. Assigning monetary values to such estimates does not reduce the subjectivity and changing nature of such reserve estimates. Indeed the uncertainties inherent in the disclosure are compounded by applying additional estimates of the rates and timing of production and the costs that will be incurred in developing and producing the reserves. The information set forth in this report is, therefore, subjective and, since judgments are involved, may not be comparable to estimates submitted by other oil and natural gas producers. In addition, since prices and costs do not remain static, and no price or cost escalations or de-escalations have been considered, the results are not necessarily indicative of the estimated fair market value of estimated proved reserves, nor of estimated future cash flows.

The standardized measure of discounted future net cash flows (SMOG) was calculated using 12-month average prices and year-end costs and statutory tax rates, adjusted for permanent differences that relate to existing proved oil, NGLs, and natural gas reserves. SMOG as of December 31 is as follows:

	2015			2014			2013
	(In thousands)
Future cash flows	$	2,475,898		$	6,398,236		$	5,573,119
Future production costs	(1,017,777		)	(2,069,636		)	(1,734,985		)
Future development costs	(228,445		)	(560,102		)	(571,170		)
Future income tax expenses	(230,544		)	(1,228,533		)	(1,044,608		)
Future net cash flows	999,132			2,539,965			2,222,356
10% annual discount for estimated timing of cash flows	(409,646		)	(1,104,221		)	(996,380		)
Standardized measure of discounted future net cash flows relating to proved oil, NGLs, and natural gas reserves	$	589,486		$	1,435,744		$	1,225,976

The principal sources of changes in the standardized measure of discounted future net cash flows were as follows:

	2015			2014			2013
	(In thousands)
Sales and transfers of oil and natural gas produced, net of production costs	$	(218,115	)	$	(558,252	)	$	(470,970	)
Net changes in prices and production costs	(1,356,333		)	(33,259		)	188,826
Revisions in quantity estimates and changes in production timing	(213,945		)	(135,125		)	(10,650		)
Extensions, discoveries, and improved recovery, less related costs	95,671			635,752			426,377
Changes in estimated future development costs	227,857			96,339			26,629
Previously estimated cost incurred during the period	59,117			164,430			96,457
Purchases of minerals in place	—			8,395			9
Sales of minerals in place	(3,338		)	(19,135		)	(43,435		)
Accretion of discount	209,979			179,190			147,579
Net change in income taxes	562,838			(98,119		)	(170,091		)
Other—net	(209,989		)	(30,448		)	(44,711		)
Net change	(846,258		)	209,768			146,020
Beginning of year	1,435,744			1,225,976			1,079,956
End of year	$	589,486		$	1,435,744		$	1,225,976

Certain information concerning the assumptions used in computing SMOG and their inherent limitations are discussed below. We believe this information is essential for a proper understanding and assessment of the data presented.

The assumptions used to compute SMOG do not necessarily reflect our expectations of actual revenues to be derived from those reserves nor their present worth. Assigning monetary values to the reserve quantity estimation process does not reduce the subjective and ever-changing nature of reserve estimates. Additional subjectivity occurs when determining present values because the rate of producing the reserves must be estimated. In addition to difficulty inherent in predicting the future, variations from the expected production rate could result from factors outside of our control, such as unintentional delays in

110

development, environmental concerns or changes in prices or regulatory controls. Also, the reserve valuation assumes that all reserves will be disposed of by production. However, other factors such as the sale of reserves in place could affect the amount of cash eventually realized.

The December 31, 2015, future cash flows were computed by applying the unescalated 12-month average prices of $50.28 per barrel for oil, $19.47 per barrel for NGLs, and $2.59 per Mcf for natural gas (then adjusted for price differentials) relating to proved reserves and to the year-end quantities of those reserves. Future price changes are considered only to the extent provided by contractual arrangements in existence at year-end.

Future production and development costs are computed by estimating the expenditures to be incurred in developing and producing the proved oil, NGLs, and natural gas reserves at the end of the year, based on continuation of existing economic conditions.

Future income tax expenses are computed by applying the appropriate year-end statutory tax rates to the future pretax net cash flows relating to proved oil, NGLs, and natural gas reserves less the tax basis of our properties. The future income tax expenses also give effect to permanent differences and tax credits and allowances relating to our proved oil, NGLs, and natural gas reserves.

Care should be exercised in the use and interpretation of the above data. As production occurs over the next several years, the results shown may be significantly different as changes in production performance, petroleum prices and costs are likely to occur.

Item 9.     Changes in and Disagreements with Accountants on Accounting and Financial Disclosure

None.

Item 9A. Controls and Procedures

(a) Evaluation of Disclosure Controls and Procedures

The company maintains “disclosure controls and procedures,” as that term is defined in Rule 13a-15(e) and Rule 15d-15(e) under the Securities Exchange Act of 1934 (the Exchange Act), that are designed to ensure that information required to be disclosed in reports the company files or submits under the Exchange Act is recorded, processed, summarized, and reported within the time periods specified in SEC rules and forms, and that such information is collected and communicated to management, including our Chief Executive Officer and Chief Financial Officer, as appropriate, to allow timely decisions regarding required disclosure. In designing and evaluating its disclosure controls and procedures, our management recognized that no matter how well conceived and operated, disclosure controls and procedures can provide only reasonable, not absolute, assurance that the objectives of the disclosure controls and procedures are met. Our disclosure controls and procedures have been designed to meet, and our management believes that they meet, reasonable assurance standards. Based on their evaluation as of the end of the period covered by this Annual Report on Form 10-K, our Chief Executive Officer and Chief Financial Officer have concluded that, subject to the limitations noted above, the company’s disclosure controls and procedures were effective.

(b) Management’s Report on Internal Control Over Financial Reporting

Our management is responsible for establishing and maintaining adequate internal control over financial reporting, as defined in Exchange Act Rule 13a-15(f). Our management, including our Chief Executive Officer and Chief Financial Officer, conducted an evaluation of the effectiveness of our internal control over financial reporting based on the Internal Control—Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). Based on the results of this evaluation, our management concluded that our internal control over financial reporting was effective as of December 31, 2015.

The effectiveness of the company’s internal control over financial reporting as of December 31, 2015, has been audited by PricewaterhouseCoopers LLP, an independent registered public accounting firm, as stated in their report which appears herein.

111

(c) Changes in Internal Control Over Financial Reporting

During the last quarter, there were no changes in our internal control over financial reporting that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

Item 9B. Other Information

None.

PART III

Item 10. Directors, Executive Officers, and Corporate Governance

In accordance with Instruction G(3) of Form 10-K, the information required by this item is incorporated in this report by reference to the Proxy Statement, except for the information regarding our executive officers which is presented below. The Proxy Statement will be filed before our annual shareholders’ meeting scheduled to be held on May 4, 2016.

Our Code of Ethics and Business Conduct applies to all directors, officers, and employees, including our Chief Executive Officer, our Chief Financial Officer, and our Controller. You can find our Code of Ethics and Business Conduct on our internet website, www.unitcorp.com. We will post any amendments to the Code of Ethics and Business Conduct, and any waivers that are required to be disclosed by the rules of either the SEC or the NYSE, on our internet website.

Because our common stock is listed on the NYSE, our Chief Executive Officer was required to make, and he has made, an annual certification to the NYSE stating that he was not aware of any violation of our corporate governance listing standards of the NYSE. Our Chief Executive Officer made his annual certification to that effect to the NYSE as of May 13, 2015. In addition, we have filed, as exhibits to this Annual Report on Form 10-K, the certifications of our Chief Executive Officer and Chief Financial Officer required under Section 302 of the Sarbanes-Oxley Act of 2002 to be filed with the SEC regarding the quality of our public disclosure.

Executive Officers

The table below and accompanying text sets forth certain information as of February 12, 2016 concerning each of our executive officers as well as certain officers of our subsidiaries. There were no arrangements or understandings between any of the officers and any other person(s) under which the officers were elected.

NAME	AGE	POSITION HELD
Larry D. Pinkston	61	Chief Executive Officer since April 1, 2005, Director since January 15, 2004, President since August 1, 2003, Chief Operating Officer since February 24, 2004, Vice President and Chief Financial Officer from May 1989 to February 24, 2004
Mark E. Schell	58	Senior Vice President since December 2002, General Counsel and Corporate Secretary since January 1987
David T. Merrill	55	Senior Vice President since May 2, 2012, Chief Financial Officer and Treasurer since February 24, 2004, Vice President of Finance from August 2003 to February 24, 2004
Brad J. Guidry	60	Executive Vice President, Unit Petroleum Company since March 1, 2005
John Cromling	68	Executive Vice President, Unit Drilling Company since April 15, 2005
Robert Parks	61	Manager and President, Superior Pipeline Company, L.L.C. since June 1996

Mr. Pinkston joined the company in December 1981. He had served as Corporate Budget Director and Assistant Controller before being appointed Controller in February, 1985. In December, 1986 he was elected Treasurer of the company and was elected to the position of Vice President and Chief Financial Officer in May, 1989. In August, 2003, he was elected to the position of President. He was elected a director of the company by the Board in January, 2004. In February, 2004, in addition to his position as President, he was elected to the office of Chief Operating Officer. In April 2005, he also began serving as Chief Executive Officer. Mr. Pinkston holds the offices of President, Chief Executive Officer, and Chief Operating Officer. He holds a Bachelor of Science Degree in Accounting from East Central University of Oklahoma.

Mr. Schell joined the company in January 1987, as its Secretary and General Counsel. In 2003, he was promoted to Senior Vice President. From 1979 until joining Unit Corporation, Mr. Schell was Counsel, Vice President, and a member of the Board

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of Directors of C & S Exploration Inc. He received a Bachelor of Science degree in Political Science from Arizona State University and his Juris Doctorate degree from the University of Tulsa College of Law. He is a member of the Oklahoma Bar Association as well as the Association of Corporate Counsel. Mr. Schell is a director of the Oklahoma Independent Petroleum Association and is Chairman of its legal committee. In addition, he is the Chairman and a director of the Oklahoma Injury Benefit Coalition, an Oklahoma non-profit association advocating for alternatives to Oklahoma's current Workers' Compensation system. He is also a member of the State Chamber of Oklahoma board of directors and serves on the board of advisors for the Greater Oklahoma City Chamber.

Mr. Merrill joined the company in August 2003 and served as its Vice President of Finance until February 2004 when he was elected to the position of Chief Financial Officer and Treasurer. In May 2012, he was promoted to Senior Vice President. From May 1999 through August 2003, Mr. Merrill served as Senior Vice President, Finance with TV Guide Networks, Inc. From July 1996 through May 1999 he was a Senior Manager with Deloitte & Touche LLP. From July 1994 through July 1996 he was Director of Financial Reporting and Special Projects for MAPCO, Inc. He began his career as an auditor with Deloitte, Haskins & Sells in 1983. Mr. Merrill received a Bachelor of Business Administration Degree in Accounting from the University of Oklahoma and is a Certified Public Accountant.

Mr. Guidry joined Unit Petroleum Company in August 1988 as a Staff Geologist. In 1991, he was promoted to Geologic Manager overseeing the Geologic Operations of the company. In January 2003, he was promoted to Vice President of the West division. In March 2005, Mr. Guidry was promoted to Senior Vice President of Exploration for Unit Petroleum Company. From 1979 to 1988, he was employed as a Division Geologist for Reading and Bates Petroleum Co. From 1978 to 1979, he worked with ANR Resources in Houston. He began his career as an open hole well logging engineer with Dresser Atlas Oilfield Services. Mr. Guidry graduated from Louisiana State University with a Bachelor of Science degree in Geology.

Mr. Cromling joined Unit Drilling Company in 1997 as a Vice-President and Division Manager. In April 2005, he was promoted to the position of Executive Vice-President of Drilling for Unit Drilling Company. In 1980, he formed Cromling Drilling Company which managed and operated drilling rigs until 1987. From 1987 to 1997, Cromling Drilling Company provided engineering consulting services and generated and drilled oil and natural gas prospects. Prior to this, he was employed by Big Chief Drilling for 11 years and served as Vice-President. Mr. Cromling graduated from the University of Oklahoma with a degree in Petroleum Engineering.

Mr. Parks founded Superior Pipeline Company, L.L.C. in 1996. When Superior was acquired by the company in July 2004, he continued with Superior as one of its managers and as its President. From April 1992 through April 1996 Mr. Parks served as Vice-President—Gathering and Processing for Cimarron Gas Companies. From December 1986 through March 1992, he served as Vice-President—Business Development for American Central Gas Companies. Mr. Parks began his career as an engineer with Cities Service Company in 1978. He received a Bachelor of Science degree in Chemical Engineering from Rice University and his M.B.A. from the University of Texas at Austin.

Item 11. Executive Compensation

In accordance with Instruction G(3) of Form 10-K, the information required by this Item is incorporated into this report by reference to the Proxy Statement (see Item 10 above).

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Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters

The following table provides information for all equity compensation plans as of the fiscal year ended December 31, 2015, under which our equity securities were authorized for issuance:

Plan Category	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 (b)		Number of Securities Remaining  Available for Future Issuance Under Equity  Compensation  Plans (Excluding Securities Reflected in Column (a)) (c)
Equity compensation plans approved by security holders (1)	129,500	(2)	$	54.15	1,903,349	(3)
Equity compensation plans not approved by security holders	—		—		—
Total	129,500		$	54.15	1,903,349

_________________________

(1) Shares awarded under all above plans may be newly issued, from our treasury or acquired in the open market.

(2) This number includes the following:

129,500 stock options outstanding under the Non-Employee Directors’ Stock Option Plan.

(3) This number reflects the shares available for issuance under the Second Amended and Restated Unit Corporation Stock and Incentive Compensation Plan effective May 6, 2015 (the amended plan). The amended plan allows us to grant stock-based compensation to our employees and non-employee directors. A total of 4,500,000 shares of the company's common stock is authorized for issuance to eligible participants under the amended plan. No more than 2,000,000 of the shares available under the amended plan may be issued as “incentive stock options” and all of the shares available under this plan may be issued as restricted stock. In addition, shares related to grants that are forfeited, terminated, canceled, expire unexercised, or settled in such manner that all or some of the shares are not issued to a participant shall immediately become available for issuance.

In accordance with Instruction G(3) of Form 10-K, the information required by this Item is incorporated into this report by reference to the Proxy Statement (see Item 10 above).

Item 13. Certain Relationships and Related Transactions, and Director Independence

In accordance with Instruction G(3) of Form 10-K, the information required by this Item is incorporated into this report by reference to the Proxy Statement (see Item 10 above).

Item 14. Principal Accounting Fees and Services

In accordance with Instruction G(3) of Form 10-K, the information required by this Item is incorporated into this report by reference to the Proxy Statement (see Item 10 above).

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PART IV

Item 15. Exhibits, Financial Statement Schedules

(a) Financial Statements, Schedules and Exhibits:

1. Financial Statements:

Included in Part II of this report:

Report of Independent Registered Public Accounting Firm

Consolidated Balance Sheets as of December 31, 2015 and 2014

Consolidated Statements of Operations for the years ended December 31, 2015, 2014, and 2013

Consolidated Statements of Comprehensive Income (Loss) for the Years Ended December 31, 2015, 2014, and 2013

Consolidated Statements of Changes in Shareholders’ Equity for the years ended December 31, 2013, 2014, and 2015

Consolidated Statements of Cash Flows for the years ended December 31, 2015, 2014, and 2013

Notes to Consolidated Financial Statements

2. Financial Statement Schedules:

Included in Part IV of this report for the years ended December 31, 2015, 2014, and 2013:

Schedule II—Valuation and Qualifying Accounts and Reserves

Other schedules are omitted because of the absence of conditions under which they are required or because the required information is included in the consolidated financial statements or notes thereto.

3. Exhibits:

The exhibit numbers in the following list correspond to the numbers assigned such exhibits in the Exhibit Table of Item 601 of Regulation S-K.

3.1	Restated Certificate of Incorporation of Unit Corporation (filed as Exhibit 3.1 to Unit's Form 8-K, dated June 29, 2000, which is incorporated herein by reference).
3.1.2	Certificate of Amendment of Amended and Restated Certificate of Incorporation of the Company (filed as Exhibit 3.1 to Unit’s Form 8-K, dated May 9, 2006 which is incorporated herein by reference).
3.2	By-laws of Unit Corporation, as amended and restated on June 17, 2014 (filed as Exhibit 3.3 to our Registration Statement on Form S-3 (File No. 333-202956), and incorporated by reference herein).
4.1	Form of Common Stock Certificate (filed as Exhibit 4.1 to Unit’s Form S-3 (File No. 333-83551), which is incorporated herein by reference).
4.4	Standstill Agreement dated March 24, 2009, by and between us and the George Kaiser Foundation (filed as Exhibit 4.2 to Unit’s Form 8-K dated March 23, 2009, which is incorporated herein by reference).
4.5	Indenture dated as of May 18, 2011, by and between the Company and Wilmington Trust FSB, as trustee (filed as Exhibit 4.1 to Unit’s Form 8-K dated May 18, 2011, which is incorporated herein by reference).
4.6	First Supplemental Indenture (including form of note) dated as of May 18, 2011, by and among the Company, as issuer, the Subsidiary Guarantors (as defined therein), as guarantors and Wilmington Trust FSB as trustee (filed as Exhibit 4.1 to Unit’s Form 8-K dated May 18, 2011, which is incorporated herein by reference).
4.7	Second Supplemental Indenture (including form of note) dated as of January 7, 2013, by and among the Registrant, as issuer, the Subsidiary Guarantors (as defined therein), as guarantors and Wilmington Trust, National Association as trustee (filed as Exhibit 4.10 to Unit’s Post-Effective Amendment No.1 to the Registration Statement on Form S-3 dated February 16, 2016, which is incorporated herein by reference).
10.1.1	Third Amended and Restated Security Agreement effective November 1, 2005 (filed as Exhibit 10.2 to Unit’s Form 8-K dated November 4, 2005, which is incorporated herein by reference).

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10.1.2*	Form of Unit Corporation Restricted Stock Bonus Agreement (filed as Exhibit 10.1 to Unit’s Form 8-K dated December 13, 2005, which is incorporated herein by reference).
10.1.3*	Unit Corporation Stock and Incentive Compensation Plan Amended and Restated May 2, 2012 (filed as Exhibit 10 to Unit’s Form 8-K dated May 2, 2012, which is incorporated herein by reference).
10.1.4	Amended and Restated Key Employee Change of Control Contract dated August 19, 2008 (filed as Exhibit 10.1 to Unit’s Form 8-K dated August 25, 2008, which is incorporated herein by reference).
10.1.5	Senior Credit Agreement dated September 13, 2011 by and among the Company and the subsidiaries named therein (as borrowers), BOKF, NA DBA Bank of Oklahoma, as Administrative Agent, and the institutions named therein (as lenders) (filed as Exhibit 10.1 to Unit’s Form 8-K dated September 13, 2011, which is incorporated herein by reference).
10.1.6	Gas Purchase Agreement dated November 21, 2011 by and between Superior Pipeline Company, L.L.C. and Sullivan and Company, L.L.C. (filed as Exhibit 10.1 to Unit’s Form 8-K dated November 21, 2011, which is incorporated herein by reference).
10.1.7	First Amendment and Consent, dated September 5, 2012, to the Senior Credit Agreement by and among the Company and the subsidiaries named therein (as borrowers), BOKF, NA DBA Bank of Oklahoma, as Administrative Agent, and the institutions named therein (as lenders) (filed as exhibit 10.1 to Unit's Form 8-K dated September 5, 2012, which is incorporated herein by reference).
10.2.1	Unit 1979 Oil and Gas Program Agreement of Limited Partnership (filed as Exhibit I to Unit Drilling and Exploration Company’s Registration Statement on Form S-1 as S.E.C. File No. 2-66347, which is incorporated herein by reference).
10.2.3*	Unit’s Amended and Restated Stock Option Plan (filed as an Exhibit to Unit’s Registration Statement on Form S-8 as S.E.C. File No’s. 33-19652, 33-44103, 33-64323 and 333-39584 which is incorporated herein by reference).
10.2.4*	Unit Corporation Non-Employee Directors’ Stock Option Plan (filed as an Exhibit to Form S-8 as S.E.C. File No. 33-49724 and File No. 333-166605, which are incorporated herein by reference).
10.2.5*	Unit Corporation Employees’ Thrift Plan (filed as an Exhibit to Form S-8 as S.E.C. File No. 33-53542, which is incorporated herein by reference).
10.2.6	Unit Consolidated Employee Oil and Gas Limited Partnership Agreement (filed as an Exhibit to Unit’s Annual Report under cover of Form 10-K for the year ended December 31, 1993, which is incorporated herein by reference).
10.2.7*	Unit Corporation Salary Deferral Plan (filed as an Exhibit to Unit’s Annual Report under cover of Form 10-K for the year ended December 31, 1993, which is incorporated herein by reference).
10.2.8*	Unit Corporation Separation Benefit Plan for Senior Management as amended (filed as an Exhibit 10.1 to Unit’s Form 8-K dated December 20, 2004).
10.2.9*	Unit Corporation Special Separation Benefit Plan as amended (filed as Exhibit 10.3 to Unit’s Form 8-K dated December 20, 2004).
10.2.10	Unit 2000 Employee Oil and Gas Limited Partnership Agreement of Limited Partnership (filed as an Exhibit to Unit’s Annual Report under the cover of Form 10-K for the year ended December 31, 1999).
10.2.11*	Unit Corporation 2000 Non-Employee Directors’ Stock Option Plan (filed as an Exhibit to Form S-8 as S.E.C. File No. 333-38166, which is incorporated herein by reference).
10.2.12	Unit 2001 Employee Oil and Gas Limited Partnership Agreement of Limited Partnership (filed as an Exhibit to Unit’s Annual Report under the cover of Form 10-K for the year ended December 31, 2000).
10.2.13	Unit 2002 Employee Oil and Gas Limited Partnership Agreement of Limited Partnership (filed as an Exhibit to Unit’s Annual Report under cover of Form 10-K for the year ended December 31, 2001).
10.2.14	Unit 2003 Employee Oil and Gas Limited Partnership Agreement of Limited Partnership (filed as an Exhibit to Unit’s Annual Report under cover of Form 10-K for the year ended December 31, 2002).
10.2.15	Unit 2004 Employee Oil and Gas Limited Partnership Agreement of Limited Partnership (filed as an Exhibit to Unit’s Annual Report under cover of Form 10-K for the year ended December 31, 2003).
10.2.16	Unit 2005 Employee Oil and Gas Limited Partnership Agreement of Limited Partnership (filed as an Exhibit to Unit’s Annual Report under cover of Form 10-K for the year ended December 31, 2004).

116

10.2.17*	Form of Indemnification Agreement entered into between the Company and its executive officers and directors (filed as Exhibit 10.1 to Unit’s Form 8-K dated February 22, 2005, which is incorporated herein by reference).
10.2.18	Unit 2006 Employee Oil and Gas Limited Partnership Agreement of Limited Partnership (filed as an Exhibit to Unit’s Annual Report under cover of Form 10-K for the year ended December 31, 2005).
10.2.19	Unit 2007 Employee Oil and Gas Limited Partnership Agreement of Limited Partnership (filed as an Exhibit to Unit’s Annual Report under cover of Form 10-K for the year ended December 31, 2006).
10.2.20*	Separation Benefit Plan as amended August 21, 2007 (filed as an Exhibit to Unit’s Form 10-Q for the quarter ended September 30, 2007).
10.2.21	Unit 2008 Employee Oil and Gas Limited Partnership Agreement of Limited Partnership (filed as an Exhibit to Unit’s Annual Report under cover of Form 10-K for the year ended December 31, 2007).
10.2.22*	Annual Bonus Performance Plan entered into October 21, 2008 (filed as Exhibit 10.1 to Unit’s Form 8-K dated October 23, 2008, which is incorporated herein by reference).
10.2.23*	Separation Benefit Plan as amended October 21, 2008 (filed as Exhibit 10.2 to Unit’s Form 8-K dated October 23, 2008, which is incorporated herein by reference).
10.2.24*	Separation Benefit Plan as amended December 31, 2008 (filed as Exhibit 10.1 to Unit’s Form 8-K dated January 6, 2009, which is incorporated herein by reference).
10.2.25*	Special Separation Benefit Plan as amended December 31, 2008 (filed as Exhibit 10.2 to Unit’s Form 8-K dated January 6, 2009, which is incorporated herein by reference).
10.2.26*	Separation Benefit Plan for Senior Management as amended December 31, 2008 (filed as Exhibit 10.3 to Unit’s Form 8-K dated January 6, 2009, which is incorporated herein by reference).
10.2.27	Unit 2009 Employee Oil and Gas Limited Partnership Agreement of Limited Partnership (filed as an Exhibit to Unit’s Annual Report under cover of Form 10-K for the year ended December 31, 2008).
10.2.28*	Unit Corporation 2000 Non-Employee Directors’ Stock Option Plan as Amended and Restated August 25, 2004 (as amended on May 29, 2009 and filed as Exhibit 10.1 to Unit’s Form 8-K dated May 29, 2009, which is incorporated herein by reference).
10.2.29	Unit 2010 Employee Oil and Gas Limited Partnership Agreement of Limited Partnership (filed as an Exhibit to Unit’s Annual Report under cover of Form 10-K for the year ended December 31, 2009).
10.2.30	Unit 2011 Employee Oil and Gas Limited Partnership Agreement of Limited Partnership (filed as an Exhibit to Unit’s Annual Report under cover of Form 10-K for the year ended December 31, 2010).
10.2.31	Second Amendment and Consent, dated April 10, 2015, to the Senior Credit Agreement by and among the Company and the subsidiaries named therein (as borrowers), BOKF, NA DBA Bank of Oklahoma, as Administrative Agent, and the institutions named therein (as lenders) (filed as exhibit 10.1 to Unit's Form 8-K dated April 13, 2015, which is incorporated herein by reference).
10.2.32*	Separation Benefit Plan as amended December 8, 2015 (filed as Exhibit 10.1 to Unit’s Form 8-K dated December 14, 2015, which is incorporated herein by reference).
10.2.33*	Special Separation Benefit Plan as amended December 8, 2015 (filed as Exhibit 10.2 to Unit’s Form 8-K dated December 14, 2015, which is incorporated herein by reference).
12	Computation Ratio of Earnings to Fixed Charges (filed herein).
21	Subsidiaries of the Registrant (filed herein).
23.1	Consent of Independent Registered Public Accounting Firm, PricewaterhouseCoopers LLP (filed herein).
23.2	Consent of Ryder Scott Company, L.P. (filed herein).
31.1	Certification of Chief Executive Officer under Rule 13a - 14(a) of the Exchange Act (filed herein).
31.2	Certification of Chief Financial Officer under Rule 13a - 14(a) of the Exchange Act (filed herein).
32	Certification of Chief Executive Officer and Chief Financial Officer under Rule 13a-14(a) of the Exchange Act and 18 U.S.C. Section 1350, as adopted under Section 906 of the Sarbanes-Oxley Act of 2002 (filed herein).
99.1	Ryder Scott Company, L.P. Summary Report (filed herein).

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101.INS	XBRL Instance Document.
101.SCH	XBRL Taxonomy Extension Schema Document.
101.CAL	XBRL Taxonomy Extension Calculation Linkbase Document.
101.DEF	XBRL Taxonomy Extension Definition Linkbase Document.
101.LAB	XBRL Taxonomy Extension Labels Linkbase Document.
101.PRE	XBRL Taxonomy Extension Presentation Linkbase Document.

* Indicates a management contract or compensatory plan identified under the requirements of Item 15 of Form 10-K.

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Schedule II

UNIT CORPORATION AND SUBSIDIARIES

VALUATION AND QUALIFYING ACCOUNTS AND RESERVES

Allowance for Doubtful Accounts:

Description	Balance at Beginning of Period		Additions Charged to Costs & Expenses		Deductions & Net Write-Offs			Balance at End of Period
	(In thousands)
Year ended December 31, 2015	$	5,039	$	1,191	$	(1,031	)	$	5,199
Year ended December 31, 2014	$	5,342	$	3,562	$	(3,865	)	$	5,039
Year ended December 31, 2013	$	5,343	$	—	$	(1	)	$	5,342

119

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.

			UNIT CORPORATION
DATE:	February 25, 2016	By:	/s/    LARRY D. PINKSTON
			LARRY D. PINKSTON
			President and Chief Executive Officer (Principal 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 indicated on the 25th day of February, 2016.

Name	Title
/s/    JOHN G. NIKKEL	Chairman of the Board and Director
John G. Nikkel
/s/    LARRY D. PINKSTON	President and Chief Executive Officer,     Chief Operating Officer and Director     (Principal Executive Officer)
Larry D. Pinkston
/s/    DAVID T. MERRILL	Senior Vice President, Chief Financial Officer and     Treasurer (Principal Financial Officer)
David T. Merrill
/s/    DON A. HAYES	Vice President, Controller     (Principal Accounting Officer)
Don A. Hayes
/s/    J. MICHAEL ADCOCK	Director
J. Michael Adcock
/s/    GARY CHRISTOPHER	Director
Gary Christopher
/s/    STEVEN B. HILDEBRAND	Director
Steven B. Hildebrand
/s/    CARLA S. MASHINSKI	Director
Carla S. Mashinski
/s/    WILLIAM B. MORGAN	Director
William B. Morgan
/s/    LARRY C. PAYNE	Director
Larry C. Payne
/s/    G. BAILEY PEYTON IV	Director
G. Bailey Peyton IV
/s/    ROBERT SULLIVAN, JR.	Director
Robert Sullivan, Jr.

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EXHIBIT INDEX

Exhibit No.	Description
12	Computation Ratio of Earnings to Fixed Charges
21	Subsidiaries of the Registrant.
23.1	Consent of Independent Registered Public Accounting Firm, PricewaterhouseCoopers LLP.
23.2	Consent of Ryder Scott Company, L.P.
31.1	Certification of Chief Executive Officer under Rule 13a—14(a) of the Exchange Act.
31.2	Certification of Chief Financial Officer under Rule 13a—14(a) of the Exchange Act.
32	Certification of Chief Executive Officer and Chief Financial Officer under Rule 13a-14(a) of the Exchange Act and 18 U.S.C. Section 1350, as adopted under Section 906 of the Sarbanes-Oxley Act of 2002.
99.1	Ryder Scott Company, L.P. Summary Report.
101.INS	XBRL Instance Document.
101.SCH	XBRL Taxonomy Extension Schema Document.
101.CAL	XBRL Taxonomy Extension Calculation Linkbase Document.
101.DEF	XBRL Taxonomy Extension Definition Linkbase Document.
101.LAB	XBRL Taxonomy Extension Labels Linkbase Document.
101.PRE	XBRL Taxonomy Extension Presentation Linkbase Document.

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EX-12

Exhibit 12

Unit Corporation

Computation Ratio of Earnings to Fixed Charges

	2015				2014				2013			2012				2011
	(Dollars in thousands)
Income (loss) from continuing operations before income taxes	$	(1,664,309	)		$	222,939			$	301,469		$	39,402			$	319,002
(Income) loss from equity investments	(18		)		133				238			205				295
Distribution from equity investments	—				303				144			—				—
Interest expense	31,464				16,904				14,578			13,878				4,167
Amortization of capitalized interest	38,695			(3)	5,461		(3	)	3,080			4,922		(3	)	1,654
Amortization of bond discount	499				467				437			259				—
Earnings (loss)	$	(1,593,669	)		$	246,207			$	319,946		$	58,666			$	325,118
Fixed charges (1)
Interest expense	$	31,464			$	16,904			$	14,578		$	13,878			$	4,167
Capitalized interest	21,711				32,246				33,670			18,867				11,478
Amortization of bond discount	499				467				437			259				—
Total fixed charges	$	53,674			$	49,617			$	48,685		$	33,004			$	15,645
Ratio of earnings to fixed charges (2)	—			(4)	5.0		x		6.6		x	1.8		x		20.8		x

_________________________

(1) Fixed charges are determined as defined in instructions for Item 503 of Regulation S-K of the Securities Act.

(2) There were no shares of preferred stock outstanding during any of the time periods indicated in the table.

(3) Amortization of capitalized interest includes the proportionate amount related to the ceiling test write-down.

(4) Earnings for the year ended December 31, 2015 were insufficient to cover fixed charges by $1.6 billion.

EX-21

Exhibit 21

SUBSIDIARIES OF THE REGISTRANT

All the companies listed below are included in the company's consolidated financial statements. Except as otherwise indicated below, the Company has 100% direct or indirect ownership of, and ultimate voting control in, each of these companies. The list is as of December 31, 2015 and excludes subsidiaries which are primarily inactive or taken singly, or as a group, do not constitute significant subsidiaries:

	State or Province	Percentage
Subsidiary	of Incorporation	Owned
Unit Drilling Company	Oklahoma	100%
Unit Petroleum Company	Oklahoma	100%
Superior Pipeline Company, L.L.C.	Oklahoma	100%

EX-23.1

EXHIBIT 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in the Registration Statements on Form S-3 (File No. 333-202956) and Form S-8 (File Nos. 33-19652, 33-44103, 33-49724, 33-64323, 33-53542, 333-38166, 333-39584, 333-135194, 333-137857, 333-166605, 333-181922, 333-205033, and 333-208394) of Unit Corporation of our report dated February 25, 2016 relating to the financial statements, financial statement schedule, and the effectiveness of internal control over financial reporting, which appears in this Form 10-K.

/s/ PricewaterhouseCoopers LLP

Tulsa, Oklahoma

February 25, 2016

EX-23.2

Exhibit 23.2

CONSENT OF RYDER SCOTT COMPANY, L.P.

We hereby consent to incorporation by reference in the Registration Statements on Form S-3 (File No. 333-202956) and Form S-8 (File Nos. 33-19652, 33-44103, 33-49724, 33-64323, 33-53542, 333-38166, 333-39584, 333-135194, 333-137857, 333-166605, 333-181922, 333-205033, and 333-208394) of Unit Corporation of the reference to our reserves audit report for Unit Corporation dated January 21, 2016, which appears in the December 31, 2015 annual report on Form 10-K of Unit Corporation.

/s/ RYDER SCOTT COMPANY, L.P.

RYDER SCOTT COMPANY, L.P.

TBPE Firm Registration No. F-1580

Houston, Texas

February 25, 2016

EX-31.1

Exhibit 31.1

302 CERTIFICATIONS

I, Larry D. Pinkston, certify that:

1. I have reviewed this annual report on form 10-K of Unit Corporation;

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 the 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(s) 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 is 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(s) 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.

Date: February 25, 2016

/s/ Larry D. Pinkston

LARRY D. PINKSTON

Chief Executive Officer and Director

EX-31.2

Exhibit 31.2

302 CERTIFICATIONS

I, David T. Merrill, certify that:

1. I have reviewed this annual report on form 10-K of Unit Corporation;

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 the 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(s) 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 is 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(s) 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.

Date: February 25, 2016

/s/ David T. Merrill

DAVID T. MERRILL

Chief Financial Officer and Treasurer

EX-32

Exhibit 32

CERTIFICATION

PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

(SUBSECTIONS (A) AND (B) OF SECTION 1350, CHAPTER 63 OF TITLE 18, UNITED

STATES CODE)

Pursuant to section 906 of the Sarbanes-Oxley Act of 2002 (subsections (a) and (b) of section 1350, chapter 63 of title 18, United States Code), each of the undersigned officers of Unit Corporation a Delaware corporation (the "Company"), does hereby certify, to such officer's knowledge, that:

The Annual Report on Form 10-K for the year ended December 31, 2015 (the "Form 10-K") of the Company fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934 and information contained in the Form 10-K fairly presents, in all material respects, the financial condition and results of operations of the Company as of December 31, 2015 and December 31, 2014 and for the years ended December 31, 2015, 2014, and 2013.

Dated: February 25, 2016

By: /s/ Larry D. Pinkston

Larry D. Pinkston

Chief Executive Officer and Director

Dated: February 25, 2016

By: /s/ David T. Merrill

David T. Merrill

Chief Financial Officer and Treasurer

The foregoing certification is being furnished solely pursuant to section 906 of the Sarbanes-Oxley Act of 2002 (subsections (a) and (b) of section 1350, chapter 63 of title 18, United States Code) and is not being filed as part of the Form 10-K or as a separate disclosure document.

A signed original of this written statement required by Section 906 of the Sarbanes-Oxley Act of 2002 has been provided to Unit Corporation and will be retained by Unit Corporation and furnished to the Securities and Exchange Commission or its staff on request.

EX-99.1

UNIT CORPORATION

Estimated

Net Reserves

Certain Leasehold Interests

SEC Parameters

As of

December 31, 2015

\s\ Robert J. Paradiso

Robert J. Paradiso, P.E.

TBPE License No. 111861

Vice President

[SEAL]

RYDER SCOTT COMPANY, L.P.

TBPE Firm Registration No. F-1580

RYDER SCOTT COMPANY PETROLEUM CONSULTANTS

Unit Corporation

1000 Kensington Tower

7130 South Lewis

Tulsa, Oklahoma 74170-2500

Gentlemen:

At the request of Unit Corporation (Unit), Ryder Scott Company, L.P. (Ryder Scott) has conducted a reserves audit of the estimates of the proved reserves as of December 31, 2015 prepared by Unit’s engineering and geological staff based on the definitions and disclosure guidelines of the United States Securities and Exchange Commission (SEC) contained in Title 17, Code of Federal Regulations, Modernization of Oil and Gas Reporting, Final Rule released January 14, 2009 in the Federal Register (SEC regulations). Our third party reserves audit, completed on January 13, 2016 and presented herein, was prepared for public disclosure by Unit in filings made with the SEC in accordance with the disclosure requirements set forth in the SEC regulations. The estimated reserves shown herein represent Unit’s estimated net reserves attributable to the leasehold interests in certain properties owned by Unit and the portion of those reserves reviewed by Ryder Scott, as of December 31, 2015. The properties reviewed by Ryder Scott incorporate 414 reserve determinations and are located in the states of Arkansas, Kansas, Louisiana, New Mexico, Oklahoma and Texas.

The properties reviewed by Ryder Scott account for a portion of Unit’s total net proved reserves as of December 31, 2015. Based on the estimates of total net proved reserves prepared by Unit, the reserves audit conducted by Ryder Scott addresses 74 percent of the total proved developed net liquid hydrocarbon reserves, 64 percent of the total proved developed net gas reserves, 25 percent of the total proved undeveloped net liquid hydrocarbon reserves, and 25 percent of the total proved undeveloped net gas reserves of Unit. The properties reviewed by Ryder Scott account for a portion of Unit’s total proved discounted future net income using SEC hydrocarbon price parameters as of December 31, 2015. Based on the reserve and income projections prepared by Unit, the audit conducted by Ryder Scott addresses 79 percent of the total proved developed discounted future net income and 81 percent of the total proved discounted future net income of Unit.

As prescribed by the Society of Petroleum Engineers in Paragraph 2.2(f) of the Standards Pertaining to the Estimating and Auditing of Oil and Gas Reserves Information (SPE auditing standards), a reserves audit is defined as “the process of reviewing certain of the pertinent facts interpreted and assumptions made that have resulted in an estimate of reserves prepared by others and the rendering of an opinion about (1) the appropriateness of the methodologies employed; (2) the adequacy and quality of the data relied upon; (3) the depth and thoroughness of the reserves estimation process; (4) the classification of reserves appropriate to the relevant definitions used; and (5) the reasonableness of the estimated reserve quantities.”

Based on our review, including the data, technical processes and interpretations presented by Unit, it is our opinion that the overall procedures and methodologies utilized by Unit in preparing their estimates of the proved reserves as of December 31, 2015 comply with the current SEC regulations and that the overall proved reserves for the reviewed properties as estimated by Unit are, in the

SUITE 600, 1015 4TH STREET, S.W. CALGARY, ALBERTA T2R 1J4    TEL (403) 262-2799FAX (403) 262-2790

621 17TH STREET, SUITE 1550DENVER, COLORADO 80293-1501 TEL (303) 623-9147FAX (303) 623-4258

Unit Corporation

January 21, 2016

Page 2

aggregate, reasonable within the established audit tolerance guidelines of 10 percent as set forth in the SPE auditing standards.

The estimated reserves presented in this report are related to hydrocarbon prices. Unit has informed us that in the preparation of their reserve and income projections, as of December 31, 2015, they used average prices during the 12-month period prior to the “as of date” of this report, determined as the unweighted arithmetic averages of the prices in effect on the first-day-of-the-month for each month within such period, unless prices were defined by contractual arrangements, as required by the SEC regulations. Actual future prices may vary significantly from the prices required by SEC regulations; therefore, volumes of reserves actually recovered and the amounts of income actually received may differ significantly from the estimated quantities presented in this report. The net reserves as estimated by Unit attributable to Unit's interest in properties that we reviewed and the reserves of properties that we did not review are summarized as follows:

SEC PARAMETERS

Estimated Net Reserves

Certain Leasehold Interests of

Unit Corporation

As of December 31, 2015

	Proved
	Developed			Total
	Producing	Non-Producing	Undeveloped	Proved
Net Reserves of Properties Audited by Ryder Scott
Oil/Condensate - MBarrels	7,543	3,301	867	11,711
Plant Products - MBarrels	16,767	6,322	1,236	24,325
Gas - MMCF	186,275	78,986	17,378	282,639
Net Reserves of Properties Not Audited by Ryder Scott
Oil/Condensate - MBarrels	2,380	1,455	1,189	5,024
Plant Products -MBarrels	5,485	2,644	5,233	13,362
Gas - MMCF	100,790	50,344	51,095	202,229
Total Net Reserves
Oil/Condensate - MBarrels	9,923	4,756	2,056	16,735
Plant Products - MBarrels	22,252	8,966	6,469	37,687
Gas - MMCF	287,065	129,330	68,473	484,868

Liquid hydrocarbons are expressed in standard 42 gallon barrels. All gas volumes are reported on an “as sold basis” expressed in millions of cubic feet (MMCF) at the official temperature and pressure bases of the areas in which the gas reserves are located. The term M barrels denotes 1000’s of barrels.

Reserves Included in This Report

In our opinion, the proved reserves presented in this report conform to the definition as set forth in the Securities and Exchange Commission’s Regulations Part 210.4-10(a). An abridged version of the SEC reserves definitions from 210.4-10(a) entitled “Petroleum Reserves Definitions” is included as an attachment to this report.

RYDER SCOTT COMPANY PETROLEUM CONSULTANTS

Unit Corporation

January 21, 2016

Page 3

The various proved reserve status categories are defined under the attachment entitled “Petroleum Reserves Status and Definitions Guidelines” in this report. The proved developed non-producing reserves included herein consist of the shut-in and behind pipe categories.

Reserves are “estimated remaining quantities of oil and gas and related substances anticipated to be economically producible, as of a given date, by application of development projects to known accumulations.” All reserve estimates involve an assessment of the uncertainty relating the likelihood that the actual remaining quantities recovered will be greater or less than the estimated quantities determined as of the date the estimate is made. The uncertainty depends chiefly on the amount of reliable geologic and engineering data available at the time of the estimate and the interpretation of these data. The relative degree of uncertainty may be conveyed by placing reserves into one of two principal classifications, either proved or unproved. Unproved reserves are less certain to be recovered than proved reserves and may be further sub-classified as probable and possible reserves to denote progressively increasing uncertainty in their recoverability. At Unit’s request, this report addresses only the proved reserves attributable to the properties reviewed herein.

Proved oil and gas reserves are those quantities of oil and gas which, by analysis of geoscience and engineering data, can be estimated with reasonable certainty to be economically producible from a given date forward. The proved reserves included herein were estimated using deterministic methods. The SEC has defined reasonable certainty for proved reserves, when based on deterministic methods, as a “high degree of confidence that the quantities will be recovered.”

Provedreserve estimates will generally be revised only as additional geologic or engineering data become available or as economic conditions change. For proved reserves, the SEC states that “as changes due to increased availability of geoscience (geological, geophysical, and geochemical), engineering, and economic data are made to the estimated ultimate recovery (EUR) with time, reasonably certain EUR is much more likely to increase or remain constant than to decrease.” Moreover, estimates of proved reserves may be revised as a result of future operations, effects of regulation by governmental agencies or geopolitical or economic risks. Therefore, the proved reserves included in this report are estimates only and should not be construed as being exact quantities, and if recovered, could be more or less than the estimated amounts.

Audit Data, Methodology, Procedure and Assumptions

The estimation of reserves involves two distinct determinations. The first determination results in the estimation of the quantities of recoverable oil and gas and the second determination results in the estimation of the uncertainty associated with those estimated quantities in accordance with the definitions set forth by the Securities and Exchange Commission’s Regulations Part 210.4-10(a). The process of estimating the quantities of recoverable oil and gas reserves relies on the use of certain generally accepted analytical procedures. These analytical procedures fall into three broad categories or methods: (1) performance-based methods; (2) volumetric-based methods; and (3) analogy. These methods may be used singularly or in combination by the reserve evaluator in the process of estimating the quantities of reserves. Reserve evaluators must select the method or combination of methods which in their professional judgment is most appropriate given the nature and amount of reliable geoscience and engineering data available at the time of the estimate, the established or anticipated performance characteristics of the reservoir being evaluated and the stage of development or producing maturity of the property.

In many cases, the analysis of the available geoscience and engineering data and the subsequent interpretation of this data may indicate a range of possible outcomes in an estimate, irrespective of the method selected by the evaluator. When a range in the quantity of reserves is

RYDER SCOTT COMPANY PETROLEUM CONSULTANTS

Unit Corporation

January 21, 2016

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identified, the evaluator must determine the uncertainty associated with the incremental quantities of the reserves. If the reserve quantities are estimated using the deterministic incremental approach, the uncertainty for each discrete incremental quantity of the reserves is addressed by the reserve category assigned by the evaluator. Therefore, it is the categorization of reserve quantities as proved, probable and/or possible that addresses the inherent uncertainty in the estimated quantities reported. For proved reserves, uncertainty is defined by the SEC as reasonable certainty wherein the “quantities actually recovered are much more likely than not to be achieved.” The SEC states that “probable reserves are those additional reserves that are less certain to be recovered than proved reserves but which, together with proved reserves, are as likely as not to be recovered.” The SEC states that “possible reserves are those additional reserves that are less certain to be recovered than probable reserves and the total quantities ultimately recovered from a project have a low probability of exceeding proved plus probable plus possible reserves.” All quantities of reserves within the same reserve category must meet the SEC definitions as noted above.

Estimates of reserves quantities and their associated reserve categories may be revised in the future as additional geoscience or engineering data become available. Furthermore, estimates of reserves quantities and their associated reserve categories may also be revised due to other factors such as changes in economic conditions, results of future operations, effects of regulation by governmental agencies or geopolitical or economic risks as previously noted herein.

The proved reserves for the properties that we reviewed were estimated by performance methods, the volumetric method, analogy, or a combination of methods. Approximately 83 percent of the proved producing reserves attributable to producing wells and/or reservoirs that we reviewed were estimated by performance methods. These performance methods include, but may not be limited to, decline curve analysis and material balance which utilized extrapolations of historical production and pressure data available through October - December 2015, in those cases where such data were considered to be definitive. The data utilized in this analysis were furnished to Ryder Scott by Unit or obtained from public data sources and were considered sufficient for the purpose thereof. The remaining 17 percent of the proved producing reserves that we reviewed were estimated by the volumetric method, analogy, or a combination of methods. These methods were used where there were inadequate historical performance data to establish a definitive trend and where the use of production performance data as a basis for the reserve estimates was considered to be inappropriate.

Approximately 85 percent of the proved developed non-producing reserves that we reviewed were estimated by the volumetric method. Approximately 15 percent of the developed non-producing reserves that we reviewed were estimated by analogy. Approximately 98 percent of the proved undeveloped reserves that we reviewed were estimated by analogy. The other 2 percent was estimated by the volumetric method. The volumetric analysis utilized pertinent well and seismic data furnished to Ryder Scott by Unit for our review or which we have obtained from public data sources that were available through October - December 2015. The data utilized from the analogues in conjunction with well and seismic data incorporated into the volumetric analysis were considered sufficient for the purpose thereof.

To estimate economically recoverable proved oil and gas reserves, we consider many factors and assumptions including, but not limited to, the use of reservoir parameters derived from geological, geophysical and engineering data which cannot be measured directly, economic criteria based on current costs and SEC pricing requirements, and forecasts of future production rates. Under the SEC regulations 210.4-10(a)(22)(v) and (26), proved reserves must be anticipated to be economically producible from a given date forward based on existing economic conditions including the prices and costs at which economic producibility from a reservoir is to be determined. While it may reasonably be anticipated that the future prices received for the sale of production and the operating costs and other

RYDER SCOTT COMPANY PETROLEUM CONSULTANTS

Unit Corporation

January 21, 2016

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costs relating to such production may increase or decrease from those under existing economic conditions, such changes were, in accordance with rules adopted by the SEC, omitted from consideration in conducting this review.

As stated previously, proved reserves must be anticipated to be economically producible from a given date forward based on existing economic conditions including the prices and costs at which economic producibility from a reservoir is to be determined. To confirm that the proved reserves reviewed by us meet the SEC requirements to be economically producible, we have reviewed certain primary economic data utilized by Unit relating to hydrocarbon prices and costs as noted herein.

The hydrocarbon prices furnished by Unit for the properties reviewed by us are based on SEC price parameters using the average prices during the 12-month period prior to the “as of date” of this report, determined as the unweighted arithmetic averages of the prices in effect on the first-day-of-the-month for each month within such period, unless prices were defined by contractual arrangements. For hydrocarbon products sold under contract, the contract prices, including fixed and determinable escalations exclusive of inflation adjustments, were used until expiration of the contract. Upon contract expiration, the prices were adjusted to the 12-month unweighted arithmetic average as previously described.

The initial SEC hydrocarbon prices in effect on December 31, 2015 for the properties reviewed by us were determined using the 12-month average first-day-of-the-month benchmark prices appropriate to the geographic area where the hydrocarbons are sold. These benchmark prices are prior to the adjustments for differentials as described herein. The table below summarizes the “benchmark prices” and “price reference” used by Unit for the geographic area reviewed by us. In certain geographic areas, the price reference and benchmark prices may be defined by contractual arrangements.

The product prices which were actually used by Unit to determine the future gross revenue for each property reviewed by us reflect adjustments to the benchmark prices for gravity, quality, local conditions, gathering and transportation fees and/or distance from market, referred to herein as “differentials.” The differentials used by Unit were accepted as factual data, we have not conducted an independent verification of the data used by Unit.

The table below summarizes Unit’s net volume weighted benchmark prices adjusted for differentials for the properties reviewed by us and referred to herein as Unit’s “average realized prices.” The average realized prices shown in the table below were determined from Unit’s estimate of the total future gross revenue before production taxes for the properties reviewed by us and Unit’s estimate of the total net reserves for the properties reviewed by us for the geographic area. The data shown in the table below is presented in accordance with SEC disclosure requirements for each of the geographic areas reviewed by us.

Geographic Area	Product	Price Reference	Average Benchmark Prices	Average Realized Prices
United States	Oil/Condensate	WTI Cushing	$50.28/Bbl	$46.93/Bbl
	NGLs	Mont Belvieu Non TET Propane	$19.47/Bbl	$13.12/Bbl
	Gas	Henry Hub	$2.59/MMBTU	$2.49/MCF

RYDER SCOTT COMPANY PETROLEUM CONSULTANTS

Unit Corporation

January 21, 2016

Page 6

The effects of derivative instruments designated as price hedges of oil and gas quantities are not reflected in Unit’s individual property evaluations.

Accumulated gas production imbalances, if any, were not taken into account in the proved gas reserve estimates reviewed. In certain cases, the gas volumes presented herein include gas consumed in operations as reserves. In those cases, the effective price was reduced such that the fuel use had no value.

Operating costs furnished by Unit are based on the operating expense reports of Unit and include only those costs directly applicable to the leases or wells for the properties reviewed by us. The operating costs include a portion of general and administrative costs allocated directly to the leases and wells. For operated properties, the operating costs include an appropriate level of corporate general administrative and overhead costs. The operating costs for non-operated properties include the COPAS overhead costs that are allocated directly to the leases and wells under terms of operating agreements. The operating costs furnished by Unit were accepted as factual data, we have not conducted an independent verification of the data used by Unit. No deduction was made for loan repayments, interest expenses, or exploration and development prepayments that were not charged directly to the leases or wells.

Development costs furnished by Unit are based on authorizations for expenditure for the proposed work or actual costs for similar projects. The development costs furnished by Unit were accepted as factual data, we have not conducted an independent verification of the data used by Unit. Unit has informed us that abandonment costs are reported outside of this report; therefore, their projection of future net income associated with the reserve projections does not reflect abandonment cost.

The proved developed non-producing and undeveloped reserves for the properties reviewed by us have been incorporated herein in accordance with Unit’s plans to develop these reserves as of December 31, 2015. The implementation of Unit’s development plans as presented to us is subject to the approval process adopted by Unit’s management. As the result of our inquiries during the course of our review, Unit has informed us that the development activities for the properties reviewed by us have been subjected to and received the internal approvals required by Unit’s management at the appropriate local, regional and/or corporate level. In addition to the internal approvals as noted, certain development activities may still be subject to specific partner AFE processes, Joint Operating Agreement (JOA) requirements or other administrative approvals external to Unit. Unit has provided written documentation stating their commitment to proceed with the development activities as presented to us. Additionally, Unit has informed us that they are not aware of any legal, regulatory or political obstacles that would significantly alter their plans. In accordance with SEC rules, actual or potential changes in economic conditions after the December 31, 2015 “as of date” of this report are not considered in making this evaluation.

Current costs used by Unit were held constant throughout the life of the properties.

Unit’s forecasts of future production rates are based on historical performance from wells currently on production. If no production decline trend has been established, future production rates were held constant, or adjusted for the effects of curtailment where appropriate, until a decline in ability to produce was anticipated. An estimated rate of decline was then applied to depletion of the reserves. If a decline trend has been established, this trend was used as the basis for estimating future production rates.

RYDER SCOTT COMPANY PETROLEUM CONSULTANTS

Unit Corporation

January 21, 2016

Page 7

Test data and other related information were used by Unit to estimate the anticipated initial production rates for those wells or locations that are not currently producing. For reserves not yet on production, sales were estimated to commence at an anticipated date furnished by Unit. Wells or locations that are not currently producing may start producing earlier or later than anticipated in Unit’s estimates due to unforeseen factors causing a change in the timing to initiate production. Such factors may include delays due to weather, the availability of rigs, the sequence of drilling, completing and/or recompleting wells and/or constraints set by regulatory bodies.

The future production rates from wells currently on production or wells or locations that are not currently producing may be more or less than estimated because of changes including, but not limited to, reservoir performance, operating conditions related to surface facilities, compression and artificial lift, pipeline capacity and/or operating conditions, producing market demand and/or allowables or other constraints set by regulatory bodies.

Unit’s operations may be subject to various levels of governmental controls and regulations. These controls and regulations may include, but may not be limited to, matters relating to land tenure and leasing, the legal rights to produce hydrocarbons, drilling and production practices, environmental protection, marketing and pricing policies, royalties, various taxes and levies including income tax and are subject to change from time to time. Such changes in governmental regulations and policies may cause volumes of proved reserves actually recovered and amounts of proved income actually received to differ significantly from the estimated quantities.

The estimates of proved reserves presented herein were based upon a detailed study of the properties in which Unit owns an interest; however, we have not made any field examination of the properties. No consideration was given in this report to potential environmental liabilities that may exist nor were any costs included by Unit for potential liabilities to restore and clean up damages, if any, caused by past operating practices.

Certain technical personnel of Unit are responsible for the preparation of reserve estimates on new properties and for the preparation of revised estimates, when necessary, on old properties. These personnel assembled the necessary data and maintained the data and workpapers in an orderly manner. We consulted with these technical personnel and had access to their workpapers and supporting data in the course of our audit.

Unit has informed us that they have furnished us all of the material accounts, records, geological and engineering data, and reports and other data required for this investigation. In performing our audit of Unit’s forecast of future proved production, we have relied upon data furnished by Unit with respect to property interests owned, production and well tests from examined wells, normal direct costs of operating the wells or leases, other costs such as transportation and/or processing fees, ad valorem and production taxes, recompletion and development costs, development plans, abandonment costs after salvage, product prices based on the SEC regulations, adjustments or differentials to product prices, geological structural and isochore maps, well logs, core analyses, and pressure measurements. Ryder Scott reviewed such factual data for its reasonableness; however, we have not conducted an independent verification of the data furnished by Unit. We consider the factual data furnished to us by Unit to be appropriate and sufficient for the purpose of our review of Unit’s estimates of reserves. In summary, we consider the assumptions, data, methods and analytical procedures used by Unit and as reviewed by us appropriate for the purpose hereof, and we have used all such methods and procedures that we consider necessary and appropriate under the circumstances to render the conclusions set forth herein.

RYDER SCOTT COMPANY PETROLEUM CONSULTANTS

Unit Corporation

January 21, 2016

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Audit Opinion

Based on our review, including the data, technical processes and interpretations presented by Unit, it is our opinion that the overall procedures and methodologies utilized by Unit in preparing their estimates of the proved reserves as of December 31, 2015 comply with the current SEC regulations and that the overall proved reserves for the reviewed properties as estimated by Unit are, in the aggregate, reasonable within the established audit tolerance guidelines of 10 percent as set forth in the SPE auditing standards.

We were in reasonable agreement with Unit's estimates of proved reserves for the properties which we reviewed; although, in certain cases there was more than an acceptable variance between Unit's estimates and our estimates due to a difference in interpretation of data or due to our having access to data which were not available to Unit when its reserve estimates were prepared. However, not withstanding, it is our opinion that on an aggregate basis the data presented herein for the properties that we reviewed fairly reflects the estimated net reserves owned by Unit.

Other Properties

Other properties, as used herein, are those properties of Unit which we did not review. The proved net reserves attributable to the other properties account for 34 percent of the total proved net liquid hydrocarbon reserves and 42 percent of the total proved net gas reserves based on estimates prepared by Unit as of December 31, 2015.

The same technical personnel of Unit were responsible for the preparation of the reserve estimates for the properties that we reviewed as well as for the properties not reviewed by Ryder Scott.

Standards of Independence and Professional Qualification

Ryder Scott is an independent petroleum engineering consulting firm that has been providing petroleum consulting services throughout the world since 1937. Ryder Scott is employee-owned and maintains offices in Houston, Texas; Denver, Colorado; and Calgary, Alberta, Canada. We have over eighty engineers and geoscientists on our permanent staff. By virtue of the size of our firm and the large number of clients for which we provide services, no single client or job represents a material portion of our annual revenue. We do not serve as officers or directors of any privately-owned or publicly-traded oil and gas company and are separate and independent from the operating and investment decision-making process of our clients. This allows us to bring the highest level of independence and objectivity to each engagement for our services.

Ryder Scott actively participates in industry-related professional societies and organizes an annual public forum focused on the subject of reserves evaluations and SEC regulations. Many of our staff have authored or co-authored technical papers on the subject of reserves related topics. We encourage our staff to maintain and enhance their professional skills by actively participating in ongoing continuing education.

Prior to becoming an officer of the Company, Ryder Scott requires that staff engineers and geoscientists have received professional accreditation in the form of a registered or certified professional engineer’s license or a registered or certified professional geoscientist’s license, or the equivalent thereof, from an appropriate governmental authority or a recognized self-regulating professional organization.

RYDER SCOTT COMPANY PETROLEUM CONSULTANTS

Unit Corporation

January 21, 2016

Page 9

We are independent petroleum engineers with respect to Unit. Neither we nor any of our employees have any financial interest in the subject properties, and neither the employment to do this work nor the compensation is contingent on our estimates of reserves for the properties which were reviewed.

The results of this audit, presented herein, are based on technical analysis conducted by teams of geoscientists and engineers from Ryder Scott. The professional qualifications of the undersigned, the technical person primarily responsible for overseeing the review of the reserves information discussed in this report, are included as an attachment to this letter.

Terms of Usage

The results of our third party audit, presented in report form herein, were prepared in accordance with the disclosure requirements set forth in the SEC regulations and intended for public disclosure as an exhibit in filings made with the SEC by Unit.

Unit makes periodic filings on Form 10-K with the SEC under the 1934 Exchange Act. Furthermore, Unit has certain registration statements filed with the SEC under the 1933 Securities Act into which any subsequently filed Form 10-K is incorporated by reference. We have consented to the incorporation by reference in the registration statements on Form S-8 of Unit of the references to our name as well as to the references to our third party report for Unit, which appears in the December 31, 2015 annual report on Form 10-K of Unit. Our written consent for such use is included as a separate exhibit to the filings made with the SEC by Unit.

We have provided Unit with a digital version of the original signed copy of this report letter. In the event there are any differences between the digital version included in filings made by Unit and the original signed report letter, the original signed report letter shall control and supersede the digital version.

The data and work papers used in the preparation of this report are available for examination by authorized parties in our offices. Please contact us if we can be of further service.

Very truly yours,

RYDER SCOTT COMPANY, L.P.

TBPE Firm Registration No. F-1580

\s\ Robert J. Paradiso

Robert J. Paradiso, P.E.

TBPE License No. 111861

Vice President

[SEAL]

RJP (FPR)/pl

RYDER SCOTT COMPANY PETROLEUM CONSULTANTS

Professional Qualifications of Primary Technical Person

The conclusions presented in this report are the result of technical analysis conducted by teams of geoscientists and engineers from Ryder Scott Company, L.P. Robert J. Paradiso was the primary technical person responsible for overseeing the estimate of the reserves, future production and income prepared by Ryder Scott presented herein.

Mr. Paradiso, an employee of Ryder Scott Company, L.P. (Ryder Scott) since 2008, is a Vice President and also serves as Project Coordinator, responsible for coordinating and supervising staff and consulting engineers of the company in ongoing reservoir evaluation studies worldwide. Before joining Ryder Scott, Mr. Paradiso served in a number of engineering positions with Getty Oil Company, Texaco, Union Texas Petroleum, Amax Oil and Gas, Inc., Norcen Explorer, Inc., Amerac Energy Corporation, Halliburton Energy Services, Santa Fe Snyder Corp., and Devon Energy Corporation. For more information regarding Mr. Paradiso’s geographic and job specific experience, please refer to the Ryder Scott Company website at www.ryderscott.com/Company/Employees.

Mr. Paradiso earned a Bachelor of Science degree in Petroleum Engineering from Texas Tech University in 1979, and is a registered Professional Engineer in the State of Texas. He is also a member of the Society of Petroleum Engineers.

In addition to gaining experience and competency through prior work experience, the Texas Board of Professional Engineers requires a minimum of fifteen hours of continuing education annually, including at least one hour in the area of professional ethics, which Mr. Paradiso fulfills. As part of his 2015 continuing education hours, Mr. Paradiso attended 2hours of formalized training during the 2015 RSC Reserves Conference relating to the definitions and disclosure guidelines contained in the United States Securities and Exchange Commission Title 17, Code of Federal Regulations, Modernization of Oil and Gas Reporting, Final Rule released January 14, 2009 in the Federal Register. Mr. Paradiso attended an additional 31.5 hours of formalized in-house training during 2015 covering such topics as the SPE/WPC/AAPG/SPEE Petroleum Resources Management System, reservoir engineering, geoscience and petroleum economics evaluation methods, procedures and software and ethics for consultants.

Based on his educational background, professional training and more than 36 years of practical experience in the estimation and evaluation of petroleum reserves, Mr. Paradiso has attained the professional qualifications as a Reserves Estimator and Reserves Auditor set forth in Article III of the “Standards Pertaining to the Estimating and Auditing of Oil and Gas Reserves Information” promulgated by the Society of Petroleum Engineers as of February 19, 2007.

RYDER SCOTT COMPANY PETROLEUM CONSULTANTS

PETROLEUM RESERVES DEFINITIONS

As Adapted From:

RULE 4-10(a) of REGULATION S-X PART 210

UNITED STATES SECURITIES AND EXCHANGE COMMISSION (SEC)

PREAMBLE

On January 14, 2009, the United States Securities and Exchange Commission (SEC) published the “Modernization of Oil and Gas Reporting; Final Rule” in the Federal Register of National Archives and Records Administration (NARA). The “Modernization of Oil and Gas Reporting; Final Rule” includes revisions and additions to the definition section in Rule 4-10 of Regulation S-X, revisions and additions to the oil and gas reporting requirements in Regulation S-K, and amends and codifies Industry Guide 2 in Regulation S-K. The “Modernization of Oil and Gas Reporting; Final Rule”, including all references to Regulation S-X and Regulation S-K, shall be referred to herein collectively as the “SEC regulations”. The SEC regulations take effect for all filings made with the United States Securities and Exchange Commission as of December 31, 2009, or after January 1, 2010. Reference should be made to the full text under Title 17, Code of Federal Regulations, Regulation S-X Part 210, Rule 4-10(a) for the complete definitions (direct passages excerpted in part or wholly from the aforementioned SEC document are denoted in italics herein).

Reserves are estimated remaining quantities of oil and gas and related substances anticipated to be economically producible, as of a given date, by application of development projects to known accumulations. All reserve estimates involve an assessment of the uncertainty relating the likelihood that the actual remaining quantities recovered will be greater or less than the estimated quantities determined as of the date the estimate is made. The uncertainty depends chiefly on the amount of reliable geologic and engineering data available at the time of the estimate and the interpretation of these data. The relative degree of uncertainty may be conveyed by placing reserves into one of two principal classifications, either proved or unproved. Unproved reserves are less certain to be recovered than proved reserves and may be further sub-classified as probable and possible reserves to denote progressively increasing uncertainty in their recoverability. Under the SEC regulations as of December 31, 2009, or after January 1, 2010, a company may optionally disclose estimated quantities of probable or possible oil and gas reserves in documents publicly filed with the SEC. The SEC regulations continue to prohibit disclosure of estimates of oil and gas resources other than reserves and any estimated values of such resources in any document publicly filed with the SEC unless such information is required to be disclosed in the document by foreign or state law as noted in §229.1202 Instruction to Item 1202.

Reserves estimates will generally be revised only as additional geologic or engineering data become available or as economic conditions change.

Reserves may be attributed to either natural energy or improved recovery methods. Improved recovery methods include all methods for supplementing natural energy or altering natural forces in the reservoir to increase ultimate recovery. Examples of such methods are pressure maintenance, natural gas cycling, waterflooding, thermal methods, chemical flooding, and the use of miscible and immiscible displacement fluids. Other improved recovery methods may be developed in the future as petroleum technology continues to evolve.

Reserves may be attributed to either conventional or unconventional petroleum accumulations. Petroleum accumulations are considered as either conventional or unconventional based on the nature of their in-place characteristics, extraction method applied, or degree of processing prior to sale.

RYDER SCOTT COMPANY PETROLEUM CONSULTANTS

PETROLEUM RESERVES DEFINITIONS

Page 2

Examples of unconventional petroleum accumulations include coalbed or coalseam methane (CBM/CSM), basin-centered gas, shale gas, gas hydrates, natural bitumen and oil shale deposits. These unconventional accumulations may require specialized extraction technology and/or significant processing prior to sale.

Reserves do not include quantities of petroleum being held in inventory.

Because of the differences in uncertainty, caution should be exercised when aggregating quantities of petroleum from different reserves categories.

RESERVES (SEC DEFINITIONS)

Securities and Exchange Commission Regulation S-X §210.4-10(a)(26) defines reserves as follows:

Reserves. Reserves are estimated remaining quantities of oil and gas and related substances anticipated to be economically producible, as of a given date, by application of development projects to known accumulations. In addition, there must exist, or there must be a reasonable expectation that there will exist, the legal right to produce or a revenue interest in the production, installed means of delivering oil and gas or related substances to market, and all permits and financing required to implement the project.

Note to paragraph (a)(26): Reserves should not be assigned to adjacent reservoirs isolated by major, potentially sealing, faults until those reservoirs are penetrated and evaluated as economically producible. Reserves should not be assigned to areas that are clearly separated from a known accumulation by a non-productive reservoir (i.e., absence of reservoir, structurally low reservoir, or negative test results). Such areas may contain prospective resources (i.e., potentially recoverable resources from undiscovered accumulations).

PROVED RESERVES (SEC DEFINITIONS)

Securities and Exchange Commission Regulation S-X §210.4-10(a)(22) defines proved oil and gas reserves as follows:

Proved oil and gas reserves. Proved oil and gas reserves are those quantities of oil and gas, which, by analysis of geoscience 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.

RYDER SCOTT COMPANY PETROLEUM CONSULTANTS

PETROLEUM RESERVES DEFINITIONS

Page 3

PROVED RESERVES (SEC DEFINITIONS) CONTINUED

(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.

(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 price 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.

RYDER SCOTT COMPANY PETROLEUM CONSULTANTS

PETROLEUM RESERVES STATUS DEFINITIONS AND GUIDELINES

As Adapted From:

RULE 4-10(a) of REGULATION S-X PART 210

UNITED STATES SECURITIES AND EXCHANGE COMMISSION (SEC)

and

PETROLEUM RESOURCES MANAGEMENT SYSTEM (SPE-PRMS)

Sponsored and Approved by:

SOCIETY OF PETROLEUM ENGINEERS (SPE)

WORLD PETROLEUM COUNCIL (WPC)

AMERICAN ASSOCIATION OF PETROLEUM GEOLOGISTS (AAPG)

SOCIETY OF PETROLEUM EVALUATION ENGINEERS (SPEE)

Reserves status categories define the development and producing status of wells and reservoirs. Reference should be made to Title 17, Code of Federal Regulations, Regulation S-X Part 210, Rule 4-10(a) and the SPE-PRMS as the following reserves status definitions are based on excerpts from the original documents (direct passages excerpted from the aforementioned SEC and SPE-PRMS documents are denoted in italics herein).

DEVELOPED RESERVES (SEC DEFINITIONS)

Securities and Exchange Commission Regulation S-X §210.4-10(a)(6) defines developed oil and gas reserves as follows:

Developed oil and gas reserves are reserves of any category that can be expected to be recovered:

(i) 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; and

(ii) Through installed extraction equipment and infrastructure operational at the time of the reserves estimate if the extraction is by means not involving a well.

Developed Producing (SPE-PRMS Definitions)

While not a requirement for disclosure under the SEC regulations, developed oil and gas reserves may be further sub-classified according to the guidance contained in the SPE-PRMS as Producing or Non-Producing.

Developed Producing Reserves

Developed Producing Reserves are expected to be recovered from completion intervals that are open and producing at the time of the estimate.

Improved recovery reserves are considered producing only after the improved recovery project is in operation.

RYDER SCOTT COMPANY PETROLEUM CONSULTANTS

PETROLEUM RESERVES STATUS DEFINITIONS AND GUIDELINES

Page 2

Developed Non-Producing

Developed Non-Producing Reserves include shut-in and behind-pipe reserves.

Shut-In

Shut-in Reserves are expected to be recovered from:

(1) completion intervals which are open at the time of the estimate, but which have not started producing;

(2) wells which were shut-in for market conditions or pipeline connections; or

(3) wells not capable of production for mechanical reasons.

Behind-Pipe

Behind-pipe Reserves are expected to be recovered from zones in existing wells, which will require additional completion work or future re-completion prior to start of production.

In all cases, production can be initiated or restored with relatively low expenditure compared to the cost of drilling a new well.

UNDEVELOPED RESERVES (SEC DEFINITIONS)

Securities and Exchange Commission Regulation S-X §210.4-10(a)(31) defines undeveloped oil and gas reserves as follows:

Undeveloped oil and gas reserves are reserves of any category 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 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 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, as defined in paragraph (a)(2) of this section, or by other evidence using reliable technology establishing reasonable certainty.

RYDER SCOTT COMPANY PETROLEUM CONSULTANTS

XML

Document and Entity Information Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2015	Feb. 12, 2016	Jun. 30, 2015
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	FY
Trading Symbol	unt
Entity Registrant Name	UNIT CORP
Entity Central Index Key	0000798949
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		51,022,722
Entity Well-known Seasoned Issuer	No
Entity Public Float			$ 726,406,732
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No

XML

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 835	$ 1,049
Accounts receivable (less allowance for doubtful accounts of $5,199 and $5,039 at December 31, 2015 and 2014, respectively)	79,941	189,812
Materials and supplies	3,565	5,590
Current derivative asset (Note 12)	10,186	31,139
Current income tax receivable	21,002	0
Current deferred tax asset (Note 8)	14,206	11,527
Assets held for sale (Note 2)	615	0
Prepaid expenses and other	9,908	13,374
Total current assets	140,258	252,491
Oil and natural gas properties, on the full cost method:
Proved properties	5,401,618	4,990,753
Unproved properties not being amortized	337,099	485,568
Drilling equipment	1,567,560	1,620,692
Gas gathering and processing equipment	689,063	628,689
Saltwater disposal systems	60,316	56,702
Corporate land and building	49,890	16,104
Transportation equipment	40,072	40,693
Other	45,489	41,602
Property, plant and equipment, gross, total	8,191,107	7,880,803
Less accumulated depreciation, depletion, amortization, and impairment	5,609,980	3,747,412
Net property and equipment	2,581,127	4,133,391
Debt issuance cost	8,667	10,255
Goodwill (Note 2)	62,808	62,808
Non-current derivative asset (Note 12)	968	0
Other assets	14,681	14,783
Total assets	2,808,509	4,473,728
Current liabilities:
Accounts payable	87,413	218,500
Accrued liabilities (Note 5)	46,918	70,171
Income taxes payable	0	481
Current portion of other long-term liabilities (Note 6)	16,560	15,019
Total current liabilities	150,891	304,171
Long-term debt (Note 6)	927,662	812,163
Non-current derivative liabilities (Note 12)	285	0
Other long-term liabilities (Note 6)	140,341	148,785
Deferred income taxes (Note 8)	275,750	876,215
Commitments and contingencies (Note 15)	0	0
Shareholders' equity:
Preferred stock, $1.00 par value, 5,000,000 shares authorized, none issued	0	0
Common stock, $0.20 par value, 175,000,000 shares authorized, 50,413,101 and 49,593,812 shares issued as of December 31, 2015 and 2014, respectively	9,831	9,732
Capital in excess of par value	486,571	468,123
Retained earnings	817,178	1,854,539
Total shareholders' equity	1,313,580	2,332,394
Total liabilities and shareholders' equity	$ 2,808,509	$ 4,473,728

XML

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 5,199	$ 5,039
Preferred stock, par value	$ 1	$ 1
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, issued	0	0
Common stock, par value	$ 0.2	$ 0.2
Common stock, shares authorized	175,000,000	175,000,000
Common stock, shares issued	50,413,101	49,593,812

XML

Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenues
Oil and natural gas	$ 385,774	$ 740,079	$ 649,718
Contract drilling	265,668	476,517	414,778
Gas gathering and processing	202,789	356,348	287,354
Total revenues	854,231	1,572,944	1,351,850
Oil and natural gas
Operating costs	166,046	187,916	184,001
Depreciation, depletion, and amortization	251,944	276,088	226,498
Impairment of oil and natural gas properties (Note 2)	1,599,348	76,683	0
Contract drilling
Operating costs	156,408	274,933	247,280
Depreciation	56,135	85,370	71,194
Impairment of contract drilling equipment (Note 2)	8,314	74,318	0
Gas gathering and processing
Operating costs	161,556	306,831	243,406
Depreciation and amortization	43,676	40,434	33,191
Impairment of gas gathering and processing systems (Note 2)	26,966	7,068	0
General and administrative	35,345	42,023	38,323
(Gain) loss on disposition of assets	7,229	(8,953)	(17,076)
Total expenses	2,512,967	1,362,711	1,026,817
Income (loss) from operations	(1,658,736)	210,233	325,033
Other income (expense):
Interest, net	(31,963)	(17,371)	(15,015)
Gain (loss) on derivatives not designated as hedges and hedge ineffectiveness, net	26,345	30,147	(8,374)
Other	45	(70)	(175)
Total other income (expense)	(5,573)	12,706	(23,564)
Income (loss) before income taxes	(1,664,309)	222,939	301,469
Income tax expense (benefit):
Current	(20,616)	9,378	15,991
Deferred	(606,332)	77,285	100,732
Income tax expense (benefit)	(626,948)	86,663	116,723
Net income (loss)	$ (1,037,361)	$ 136,276	$ 184,746
Net income (loss) per common share:
Basic	$ (21.12)	$ 2.80	$ 3.83
Diluted	$ (21.12)	$ 2.78	$ 3.80

XML

Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Net income (loss)	$ (1,037,361)	$ 136,276	$ 184,746
Other comprehensive income (loss), net of taxes:
Change in value of derivative instruments used as cash flow hedges, net of tax of $0, $0, and ($4,717)	0	0	(7,349)
Reclassification - derivative settlements, net of tax of $0, $0, and ($249)	0	0	(354)
Ineffective portion of derivatives, net of tax of $0, $0, and $74	0	0	116
Comprehensive income (loss)	$ (1,037,361)	$ 136,276	$ 177,159

XML

Consolidated Statements of Comprehensive Income (Loss) Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Change in value of derivative instruments used as cash flow hedges, tax	$ 0	$ 0	$ (4,717)
Reclassification - derivative settlements, tax	0	0	(249)
Ineffective portion of derivatives, tax	$ 0	$ 0	$ 74

XML

Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Capital In Excess of Par Value	Accumulated Other Comprehensive Income	Retained Earnings
Beginning balances at Dec. 31, 2012	$ 1,974,301	$ 9,594	$ 423,603	$ 7,587	$ 1,533,517
Comprehensive income:
Net income (loss)	184,746	0	0	0	184,746
Other comprehensive loss, net of tax	(7,587)	0	0	(7,587)	0
Comprehensive income (loss)	177,159
Activity in employee compensation plans	21,932	65	21,867	0	0
Ending balances at Dec. 31, 2013	2,173,392	9,659	445,470	0	1,718,263
Comprehensive income:
Net income (loss)	136,276	0	0	0	136,276
Other comprehensive loss, net of tax				0
Comprehensive income (loss)	136,276
Activity in employee compensation plans	22,726	73	22,653	0	0
Ending balances at Dec. 31, 2014	2,332,394	9,732	468,123	0	1,854,539
Comprehensive income:
Net income (loss)	(1,037,361)	0	0	0	(1,037,361)
Other comprehensive loss, net of tax				0
Comprehensive income (loss)	(1,037,361)
Activity in employee compensation plans	18,547	99	18,448	0	0
Ending balances at Dec. 31, 2015	$ 1,313,580	$ 9,831	$ 486,571	$ 0	$ 817,178

XML

Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Activity in employee compensation plans (shares)	819,289	486,808	525,056
Other comprehensive income, tax	$ 0	$ 0	$ (4,892)

XML

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
OPERATING ACTIVITIES:
Net income (loss)	$ (1,037,361)	$ 136,276	$ 184,746
Adjustments to reconcile net income (loss) to net cash provided (used) by operating activities:
Depreciation, depletion, and amortization	354,830	404,943	333,907
Impairment of properties (Note 2)	1,634,628	158,069	0
(Gain) loss on derivatives	(26,345)	(30,147)	7,771
Cash (payments) receipts on derivatives settled	46,615	(6,038)	(1,161)
(Gain) loss on disposition of assets	7,229	(8,953)	(17,076)
Deferred tax expense (benefit)	(606,332)	77,285	100,732
Employee stock compensation plans	21,468	24,320	21,317
Bad debt expense	1,191	3,562	0
ARO liability accretion	3,453	4,599	5,450
Other, net	(1,517)	1,068	2,250
Changes in operating assets and liabilities increasing (decreasing) cash:
Accounts receivable	105,426	(60,800)	2,967
Materials and supplies	1,507	2,602	(2,435)
Prepaid expenses and other	(14,348)	(444)	1,813
Accounts payable	(20,306)	4,715	15,715
Accrued liabilities	(22,920)	(1,297)	17,198
Contract advances	(274)	(767)	1,137
Net cash provided by operating activities	446,944	708,993	674,331
INVESTING ACTIVITIES:
Capital expeditures	(561,453)	(981,374)	(703,984)
Producing property and other acquisitions	(179)	(5,723)	0
Proceeds from disposition of property and equipment	11,854	66,197	120,910
Other	0	303	3,894
Net cash used in investing activities	(549,778)	(920,597)	(579,180)
FINANCING ACTIVITIES:
Borrowings under line of credit	618,500	725,800	222,500
Payments under line of credit	(503,500)	(559,800)	(293,600)
Payments on capitalized leases	(3,549)	(2,392)	0
Proceeds from exercise of stock options	0	1,083	574
Excess Tax Benefit from Share-based Compensation, Financing Activities	(3,207)	1,614	8
Increase (decrease) in book overdrafts (Note 2)	(5,624)	27,755	(7,014)
Net cash provided by (used in) financing activities	102,620	194,060	(77,532)
Net increase (decrease) in cash and cash equivalents	(214)	(17,544)	17,619
Cash and cash equivalents, beginning of year	1,049	18,593	974
Cash and cash equivalents, end of year	835	1,049	18,593
Supplemental disclosure of cash flow information:
Interest paid (net of capitalization)	30,910	13,620	12,485
Income taxes	3,540	15,898	9,100
Changes in accounts payable and accrued liabilities related to purchases of property, plant, and equipment	105,157	(31,968)	(6,550)
Non-cash reductions to oil and natural gas properties related to asset retirement obligations	5,694	37,689	17,952
Non-cash additions to property, plant, and equipment acquired under capital leases	$ 0	$ (28,202)	$ 0

XML

Organization

12 Months Ended

Dec. 31, 2015

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Organization

ORGANIZATION

Unless the context clearly indicates otherwise, references in this report to “Unit”, “Company”, “we”, “our”, “us”, or like terms refer to Unit Corporation and its subsidiaries.

We are primarily engaged in the exploration, development, acquisition, and production of oil and natural gas properties, the land contract drilling of natural gas and oil wells, and the buying, selling, gathering, processing, and treating of natural gas. Our operations are located principally in the United States and are organized in the following three reporting segments: (1) Oil and Natural Gas, (2) Contract Drilling, and (3) Mid-Stream.

Oil and Natural Gas.  Carried out by our subsidiary, Unit Petroleum Company, we explore, develop, acquire, and produce oil and natural gas properties for our own account. Our producing oil and natural gas properties, unproved properties, and related assets are located mainly in Oklahoma and Texas, and to a lesser extent, in Arkansas, Colorado, Kansas, Louisiana, Mississippi, Montana, New Mexico, North Dakota, and Wyoming.

Contract Drilling.  Carried out by our subsidiary, Unit Drilling Company, we drill onshore oil and natural gas wells for our own account as well as for a wide range of other oil and natural gas companies. Our drilling operations are mainly located in Oklahoma, Texas, Wyoming, North Dakota, and to a lesser extent in Louisiana and Kansas.

Historically, our contract drilling segment experienced more demand for natural gas drilling as opposed to drilling for oil and NGLs. Since 2008, operators have been focusing more on drilling for oil and NGLs.

Mid-Stream.  Carried out by our subsidiary, Superior Pipeline Company, L.L.C. and its subsidiaries, we buy, sell, gather, transport, process, and treat natural gas for our own account and for third parties. Mid-stream operations are performed in Oklahoma, Texas, Kansas, Pennsylvania, and West Virginia.

XML

Summary Of Significant Accounting Policies

12 Months Ended

Dec. 31, 2015

Accounting Policies [Abstract]

Summary Of Significant Accounting Policies

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Principles of Consolidation.  The consolidated financial statements include the accounts of Unit Corporation and its subsidiaries. Our investment in limited partnerships is accounted for on the proportionate consolidation method, whereby our share of the partnerships’ assets, liabilities, revenues, and expenses are included in the appropriate classification in the accompanying consolidated financial statements.

Certain amounts in the accompanying consolidated financial statements for prior periods have been reclassified to conform to current year presentation. Certain financial statement captions were expanded or combined with no impact to consolidated net income or shareholders' equity.

Accounting Estimates.  The preparation of financial statements in conformity with generally accepted accounting principles (GAAP) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.

Drilling Contracts.  We recognize revenues and expenses generated from “daywork” drilling contracts as the services are performed, since we do not bear the risk of completion of the well. Under “footage” and “turnkey” contracts, we bear the risk of completion of the well; therefore, revenues and expenses are recognized when the well is substantially completed. Under this method, substantial completion is determined when the well bore reaches the negotiated depth as stated in the contract. The entire amount of a loss, if any, is recorded when the loss is determinable. The costs of uncompleted drilling contracts include expenses incurred to date on “footage” or “turnkey” contracts, which are still in process at the end of the period, and are included in other current assets. Typically, any one of these three types of contracts can be used for the drilling of one well which can take from 10 to 90 days. At December 31, 2015, all of our contracts were daywork contracts of which nine were multi-well and had durations which ranged from six months to three years, five of which expire in 2016 and four expiring in 2017. These longer term contracts may contain a fixed rate for the duration of the contract or provide for the periodic renegotiation of the rate within a specific range from the existing rate.

Cash Equivalents and Book Overdrafts.  We include as cash equivalents all investments with maturities at date of purchase of three months or less which are readily convertible into known amounts of cash. Book overdrafts are checks that have been issued before the end of the period, but not presented to our bank for payment before the end of the period. At December 31, 2015 and 2014, book overdrafts were $22.1 million and $27.8 million, respectively.

Accounts Receivable.  Accounts receivable are carried on a gross basis, with no discounting, less an allowance for doubtful accounts. We estimate the allowance for doubtful accounts based on existing economic conditions, the financial condition of our customers, and the amount and age of past due accounts. Receivables are considered past due if full payment is not received by the contractual due date. Past due accounts are generally written off against the allowance for doubtful accounts only after all collection attempts have been unsuccessful.

Financial Instruments and Concentrations of Credit Risk and Non-performance Risk.  Financial instruments, which potentially subject us to concentrations of credit risk, consist primarily of trade receivables with a variety of oil and natural gas companies. We do not generally require collateral related to receivables. Our credit risk is considered to be limited due to the large number of customers comprising our customer base. Below are the third-party customers that accounted for more than 10% of our segment’s revenues:

	2015		2014		2013
Oil and Natural Gas:
Sunoco Logistics Partners L.P.	19	%	14	%	8	%
Valero Energy Corporation	15	%	24	%	25	%
Drilling:
QEP Resources, Inc.	25	%	19	%	18	%
Whiting Petroleum Corp. (formerly Kodiak Oil and Gas Corp.)	7	%	9	%	10	%
Mid-Stream:
ONEOK Partners, L.P.	29	%	44	%	57	%
Tenaska Resources, LLC	18	%	22	%	16	%
Laclede Group, Inc.	12	%	16	%	7	%

We had a concentration of cash of $2.3 million and $18.4 million at December 31, 2015 and 2014, respectively with one bank.

The use of derivative transactions also involves the risk that the counterparties will be unable to meet the financial terms of the transactions. We considered this non-performance risk with regard to our counterparties and our own non-performance risk in our derivative valuation at December 31, 2015 and determined there was no material risk at that time. At December 31, 2015, the fair values of the net assets we had with each of the counterparties with respect to all of our commodity derivative transactions are listed in the table below:

	December 31, 2015
	(In millions)
Canadian Imperial Bank of Commerce	$	8.7
Bank of Montreal	1.1
Scotiabank	0.7
Bank of America Merrill Lynch	0.4
Total assets	$	10.9

Property and Equipment.  Drilling equipment, transportation equipment, gas gathering and processing systems, and other property and equipment are carried at cost less accumulated depreciation. Renewals and enhancements are capitalized while repairs and maintenance are expensed. Depreciation of drilling equipment is recorded using the units-of-production method based on estimated useful lives starting at 15 years , including a minimum provision of 20% of the active rate when the equipment is idle. We use the composite method of depreciation for drill pipe and collars and calculate the depreciation by footage actually drilled compared to total estimated remaining footage. Depreciation of other property and equipment is computed using the straight-line method over the estimated useful lives of the assets ranging from 3 to 15 years.

We review the carrying amounts of long-lived assets for potential impairment annually, typically during the fourth quarter, or when events occur or changes in circumstances suggest that these carrying amounts may not be recoverable. Changes that could prompt such an assessment may include equipment obsolescence, changes in the market demand for a specific asset, changes in commodity prices, periods of relatively low drilling rig utilization, declining revenue per day, declining cash margin per day, or overall changes in general market conditions. Assets are determined to be impaired if a forecast of undiscounted estimated future net operating cash flows directly related to the asset, including disposal value if any, is less than the carrying amount of the asset. If any asset is determined to be impaired, the loss is measured as the amount by which the carrying amount of the asset exceeds its fair value. The estimate of fair value is based on the best information available, including prices for similar assets. Changes in these estimates could cause us to reduce the carrying value of property and equipment.Asset impairment evaluations are, by nature, highly subjective. They involve expectations about future cash flows generated by our assets and reflect management’s assumptions and judgments regarding future industry conditions and their effect on future utilization levels, dayrates, and costs. The use of different estimates and assumptions could result in materially different carrying values of our assets.

As of December 31, 2015, with continuing declines to commodity prices and an outlook that commodity prices may be lower for longer, we lowered our expectations about future utilization of our drilling rigs and associated cash flows.  We performed a Step 1 analysis as required by ASC 360-10-35 to assess the recoverability of long-lived assets within our contract drilling segment.  With respect to these assets, future cash flows were estimated over the expected remaining life of the assets. Management determined that, on an undiscounted basis, expected cash flows exceeded the carrying value of the long-lived assets within our contract drilling segment by 99%, and there was no impairment at December 31, 2015.

On a periodic basis, we evaluate our fleet of drilling rigs for marketability based on the condition of inactive rigs, expenditures that would be necessary to bring them to working condition and the expected demand for drilling services by rig type. The components comprising inactive rigs are evaluated, and those components with continuing utility to the Company’s other marketed rigs are transferred to other rigs or to its yards to be used as spare equipment. The remaining components of these rigs are retired. In December 2014, we removed from service 31 drilling rigs, some older top drives, and certain drill pipe no longer marketable in the current environment and based on the estimated market value from third-party assessments, we recorded a write-down of approximately $74.3 million, pre-tax. During the first quarter of 2015, we sold one of these drilling rigs to an unaffiliated third party. The proceeds of this sale, less costs to sell, exceeded the $0.3 million net book value of the drilling rig resulting in a gain of $7,900. During the second quarter, we recorded an additional write-down on the remaining drilling rigs and other equipment of approximately $8.3 million pre-tax based on the estimated market value from similar auctions. During the third quarter, we sold the remaining 30 drilling rigs and most of the equipment in an auction. The proceeds from the sale of those assets, less costs to sell, was less than the $11.0 million net book value resulting in a loss of $7.3 million pre-tax. Some of the equipment that was not sold at the auction will be sold within the next twelve months and remain classified as assets held for sale. The net book value of those assets is $0.6 million. When property and equipment components are disposed of, the cost and the related accumulated depreciation are removed from the accounts and any resulting gain or loss is generally reflected in operations. For dispositions of drill pipe and drill collars, an average cost for the appropriate feet of drill pipe and drill collars is removed from the asset account and charged to accumulated depreciation and proceeds, if any, are credited to accumulated depreciation.

In 2015, our mid-stream segment incurred a $27.0 million, pre-tax write-down of three of its systems, Bruceton Mills, Midwell, and Spring Creek due to anticipated future cash flow and future development around these systems not being sufficient to support their carrying value. The estimated future cash flows were less than the carrying value on these systems.

In 2014, our mid-stream segment incurred a $7.1 million, pre-tax write-down of three of its systems, Weatherford, Billy Rose, and Spring Creek due to anticipated future cash flow and future development around these systems not being sufficient to support their carrying value. The estimated future cash flows were less than the carrying value on these systems. No significant impairments were recorded in 2013.

We record an asset and a liability equal to the present value of the expected future ARO associated with our oil and gas properties. The ARO asset is depreciated in a manner consistent with the depreciation of the underlying physical asset. We measure changes in the liability due to passage of time by accreting an interest charge. This amount is recognized as an increase in the carrying amount of the liability and as a corresponding accretion expense.

Capitalized Interest.  During 2015, 2014, and 2013, interest of approximately $21.7 million, $32.2 million, and $33.7 million, respectively, was capitalized based on the net book value associated with unproved properties not being amortized, the construction of additional drilling rigs, and the construction of gas gathering systems. Interest is being capitalized using a weighted average interest rate based on our outstanding borrowings.

Goodwill.Goodwill represents the excess of the cost of acquisitions over the fair value of the net assets acquired. Goodwill is not amortized, but an impairment test is performed at least annually to determine whether the fair value has decreased and is performed additionally when events indicate an impairment may have occurred. For purposes of impairment testing, goodwill is evaluated at the reporting unit level. Our goodwill is all related to our contract drilling segment, and accordingly, the impairment test is generally based on the estimated discounted future net cash flows of our drilling segment, utilizing discount rates and other factors in determining the fair value of our drilling segment. Inputs in our estimated discounted future net cash flows include drilling rig utilization, day rates, gross margin percentages, and terminal value.No goodwill impairment was recorded for the years ended December 31, 2015, 2014, or 2013. There were no additions to goodwill in 2015, 2014, or 2013. Based on our impairment test performed as of December 31, 2015, the fair value of our drilling segment exceeded its carrying value by 19%. Goodwill of $2.2 million is deductible for tax purposes.

Intangible Assets.  Intangible assets are capitalized and amortized over the estimated period benefited. Such amounts are reviewed for possible impairment whenever events or changes in circumstances indicate that the carrying amount may not be recoverable. No intangible asset impairment was recorded for the years ended December 31, 2015, 2014, or 2013. Amortization of $0.7 million was recorded 2013. Accumulated amortization for 2013 was $18.0 million. Our intangible assets became fully amortized in 2013, so no amortization was recorded in 2014 or 2015.

Oil and Natural Gas Operations.  We account for our oil and natural gas exploration and development activities using the full cost method of accounting prescribed by the SEC. Accordingly, all productive and non-productive costs incurred in connection with the acquisition, exploration and development of our oil, NGLs, and natural gas reserves, including directly related overhead costs and related asset retirement costs, are capitalized and amortized on a units-of-production method based on proved oil and natural gas reserves. Directly related overhead costs of $19.2 million, $23.7 million, and $21.5 million were capitalized in 2015, 2014, and 2013, respectively. Independent petroleum engineers annually audit our internal evaluation of our reserves. The average rates used for depreciation, depletion, and amortization (DD&A) were $12.30, $14.82, and $13.32 per Boe in 2015, 2014, and 2013, respectively. The calculation of DD&A includes estimated future expenditures to be incurred in developing proved reserves and estimated dismantlement and abandonment costs, net of estimated salvage values. Our unproved properties totaling $337.1 million are excluded from the DD&A calculation.

No gains or losses are recognized on the sale, conveyance, or other disposition of oil and natural gas properties unless a significant reserve amount to our total reserves is involved.

Revenue from the sale of oil and natural gas is recognized when title passes, net of royalties.

Under the full cost rules, at the end of each quarter, we review the carrying value of our oil and natural gas properties. The full cost ceiling is based principally on the estimated future discounted net cash flows from our oil and natural gas properties discounted at 10%. We use the unweighted arithmetic average of the commodity prices existing on the first day of each of the 12 months before the end of the reporting period to calculate discounted future revenues, unless prices were otherwise determined under contractual arrangements. In the event the unamortized cost of oil and natural gas properties being amortized exceeds the full cost ceiling, as defined by the SEC, the excess is charged to expense in the period during which such excess occurs. Once incurred, a write-down of oil and natural gas properties is not reversible.

We determined the value of certain unproved oil and gas properties were diminished (in part or in whole) based on an impairment evaluation and our anticipated future exploration plans. Those determinations resulted in $73.7 million (in 2014) and $114.4 million (in 2015) of costs being added to the total of our capitalized costs being amortized. We incurred a

$76.7 million pre-tax ($47.7 million net of tax) non-cash ceiling test write-down of our oil and natural gas properties in 2014. In 2015, we incurred non-cash ceiling test write-downs of our oil and natural gas properties of $1.6 billion pre-tax ($1.0 billion net of tax) in 2015 due to the inclusion of the impaired value of those unproved properties and a reduction of the 12-month average commodity prices during the year.

Our contract drilling segment provides drilling services for our exploration and production segment. Depending on their timing some of the drilling services performed on our properties are also deemed to be associated with the acquisition of an ownership interest in the property. Revenues and expenses for such services are eliminated in our statement of operations, with any profit recognized as a reduction in our investment in our oil and natural gas properties. The contracts for these services are issued under the same conditions and rates as the contracts entered into with unrelated third parties. We eliminated revenue of $22.1 million, $89.5 million, and $64.3 million for 2015, 2014, and 2013, respectively from our contract drilling segment and eliminated the associated operating expense of $18.3 million, $62.4 million, and $46.9 million during 2015, 2014, and 2013, respectively, yielding $3.8 million, $27.1 million, and $17.4 million during 2015, 2014, and 2013, respectively, as a reduction to the carrying value of our oil and natural gas properties.

Gas Gathering and Processing Revenue. Our gathering and processing segment recognizes revenue from the gathering and processing of natural gas and NGLs in the period the service is provided based on contractual terms.

Insurance.  We are self-insured for certain losses relating to workers’ compensation, control of well and employee medical benefits. Insured policies for other coverage contain deductibles or retentions per occurrence that range from zero to $1.0 million. We have purchased stop-loss coverage in order to limit, to the extent feasible, per occurrence and aggregate exposure to certain types of claims. However, there is no assurance that the insurance coverages we have will adequately protect us against liability from all potential consequences. Unit Texas Drilling, L.L.C. was merged into its parent company, Unit Drilling Company, effective October 31, 2015, at which time the ERISA governed occupational injury benefit program was closed. All new claims after this date are processed under an existing insured workers’ compensation program. If insurance coverage becomes more expensive, we may choose to self-insure, decrease our limits, raise our deductibles, or any combination of these rather than pay higher premiums.

Derivative Activities.  All derivatives are recognized on the balance sheet and measured at fair value. For our economic hedges that we did not apply cash flow accounting to, any changes in their fair value occurring before their maturity (i.e., temporary fluctuations in value) are reported in gain (loss) on derivatives not designated as hedges and hedge ineffectiveness, net in our Consolidated Statements of Operations. The commodity derivative instruments we had under cash flow accounting expired as of December 2013. Previous changes in the fair value of derivatives designated as cash flow hedges, to the extent they were effective in offsetting cash flows attributable to the hedged risk, were recorded in OCI until the hedged item was recognized into earnings. When the hedged item was recognized into earnings, it was reported in oil and natural gas revenues. Any change in fair value resulting from ineffectiveness was recognized in gain (loss) on derivatives not designated as hedges and hedge ineffectiveness, net. In August 2012, we determined on a prospective basis, to enter into economic hedges without electing cash flow hedge accounting.

We do not engage in derivative transactions for speculative purposes. We document our risk management strategy, and for the cash flow hedges, we tested the hedge effectiveness at the inception of and during the term of each hedge.

Limited Partnerships.  Unit Petroleum Company is a general partner in 15 oil and natural gas limited partnerships sold privately and publicly. Some of our officers, directors, and employees own the interests in most of these partnerships. We share in each partnership’s revenues and costs in accordance with formulas set out in each of the limited partnership agreement. The partnerships also reimburse us for certain administrative costs incurred on behalf of the partnerships.

Income Taxes.  Measurement of current and deferred income tax liabilities and assets is based on provisions of enacted tax law; the effects of future changes in tax laws or rates are not included in the measurement. Valuation allowances are established where necessary to reduce deferred tax assets to the amount expected to be realized. Income tax expense is the tax payable for the year and the change during that year in deferred tax assets and liabilities.

The accounting for uncertainty in income taxes prescribes a recognition threshold and measurement attribute for the financial statement recognition and measurement of a tax position taken or expected to be taken in a return. Guidance is also provided on de-recognition, classification, interest and penalties, accounting in interim periods, disclosure, and transition. We have $0.4 million of unrecognized tax benefits.

Natural Gas Balancing.  We use the sales method for recording natural gas sales. This method allows for recognition of revenue, which may be more or less than its share of pro-rata production from certain wells. We estimate our December 31, 2015 balancing position to be approximately 4.7 Bcf on under-produced properties and approximately 4.8 Bcf on over-produced properties. We have recorded a receivable of $2.5 million on certain wells where we estimate that insufficient reserves are available for us to recover the under-production from future production volumes. We have also recorded a liability of $5.0 million on certain properties where we believe there are insufficient reserves available to allow the under-produced owners to recover their under-production from future production volumes. Our policy is to expense the pro-rata share of lease operating costs from all wells as incurred. Such expenses relating to the balancing position on wells in which we have imbalances are not material.

Employee and Director Stock Based Compensation.  We recognize in our financial statements the cost of employee services received in exchange for awards of equity instruments based on the grant date fair value of those awards. The amount of our equity compensation cost relating to employees directly involved in exploration activities of our oil and natural gas segment is capitalized to our oil and natural gas properties. Amounts not capitalized to our oil and natural gas properties are recognized in general and administrative expense and operating costs of our business segments. We utilize the Black-Scholes option pricing model to measure the fair value of stock options and stock appreciation rights (SARs). The value of our restricted stock grants is based on the closing stock price on the date of the grants.

Impact of Financial Accounting Pronouncements.

Income Taxes: Balance Sheet Classification of Deferred Taxes. The FASB has issued ASU 2015-17. This changes how deferred taxes are classified on organizations' balance sheets. Organizations will be required to classify all deferred tax assets and liabilities as noncurrent. The amendments apply to all organizations that present a classified balance sheet. For public companies, the amendments are effective for financial statements issued for annual periods beginning after December 15, 2016, and interim periods within those annual periods. Early adoption of the amendments is permitted. We are in the process of evaluating the impact it will have on our financial statements.

Interest—Imputation of Interest: Simplifying the Presentation of Debt Issuance Costs. The FASB has issued ASU 2015-03. The amendments in this ASU require that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. The FASB has also issued ASU 2015-15. The amendments in this ASU allow an entity to defer and present debt issuance cost as an asset and subsequently amortize the deferred debt issuance costs ratably over the term of the line-of-credit arrangement, regardless of whether there are any outstanding borrowings on the line-of-credit arrangement. For public business entities, the amendments are effective for financial statements issued for fiscal years beginning after December 15, 2015, and interim periods within those fiscal years. Early adoption of the amendments is permitted for financial statements that have not been previously issued. The amendments should be applied on a retrospective basis, wherein the balance sheet of each individual period presented should be adjusted to reflect the period-specific effects of applying the new guidance. We do not expect the adoption of this guidance will have a material impact on our financial statements.

Revenue from Contracts with Customers. The FASB has issued ASU 2014-09. This affects any entity using U.S. GAAP that either enters into contracts with customers to transfer goods or services or enters into contracts for the transfer of nonfinancial assets unless those contracts are within the scope of other standards (e.g., insurance contracts or lease contracts). The core principle of the guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The FASB has issued 2015-14, which defers the effective date to annual reporting periods beginning after December 15, 2017, including interim reporting periods within that reporting period. We are in the process of evaluating the impact it will have on our financial statements.

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Divestitures

12 Months Ended

Dec. 31, 2015

Acquisitions and divestitures [Abstract]

Divestitures

DIVESTITURES

Oil and Natural Gas

In August 2013, we sold additional Bakken property interests. The proceeds, net of related expenses, were $57.1 million. In addition, we had other non-core asset sales with proceeds, net of related expenses, of $21.7 million, $33.1 million, and $1.9 million in 2013, 2014, and 2015, respectively. Proceeds from these dispositions reduced the net book value of the full cost pool with no gain or loss recognized.

Contract Drilling

During 2013, we sold five 2,000-3,000 horsepower drilling rigs to unaffiliated third-parties for a gain of $16.5 million. Four of our idle drilling rigs were classified as assets held for sale at December 31, 2013.

These four drilling rigs were sold to an unaffiliated third party in the first quarter of 2014. The proceeds of this sale, less costs to sell, exceeded the $16.3 million net book value of the drilling rigs, both in the aggregate and for each drilling rig, resulting in a gain of $9.6 million.

During the first quarter of 2015, we sold one drilling rig to an unaffiliated third party for $0.3 million resulting in a gain of $7,900. During the third quarter, we sold 30 drilling rigs, some old top drive equipment, and drill pipe in an auction. The proceeds from the sale of those assets, less costs to sell, was less than the $11.0 million net book value resulting in a loss of $7.3 million pre-tax.

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Earnings (Loss) Per Share

12 Months Ended

Dec. 31, 2015

Earnings Per Share [Abstract]

Earnings (Loss) Per Share

EARNINGS (LOSS) PER SHARE

The following data shows the amounts used in computing earnings (loss) per share:

	Income (Loss) (Numerator)			Weighted Shares (Denominator)	Per-Share Amount
	(In thousands except per share amounts)
For the year ended December 31, 2013:
Basic earnings per common share	$	184,746		48,218	$	3.83
Effect of dilutive stock options, restricted stock, and SARs	—			354	(0.03		)
Diluted earnings per common share	$	184,746		48,572	$	3.80
For the year ended December 31, 2014:
Basic earnings per common share	$	136,276		48,611	$	2.80
Effect of dilutive stock options, restricted stock, and SARs	—			472	(0.02		)
Diluted earnings per common share	$	136,276		49,083	$	2.78
For the year ended December 31, 2015:
Basic earnings (loss) per common share	$	(1,037,361	)	49,110	$	(21.12	)
Effect of dilutive stock options, restricted stock, and SARs	—			—	—
Diluted earnings (loss) per common share	$	(1,037,361	)	49,110	$	(21.12	)

Due to the net loss for the year ended December 31, 2015, approximately 186,000 weighted average shares related to stock options, restricted stock, and SARs were antidilutive and were excluded from the earnings per share calculation above.

The following options and their average exercise prices were not included in the computation of diluted earnings per share because the option exercise prices were greater than the average market price of our common stock for the years ended December 31:

	2015		2014		2013
Options and SARs	261,270		73,500		149,665
Average exercise price	$	50.34	$	64.43	$	58.41

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Accrued Liabilities

12 Months Ended

Dec. 31, 2015

Accrued Liabilities [Abstract]

Accrued Liabilities [Text Block]

ACCRUED LIABILITIES

Accrued liabilities consisted of the following as of December 31:

	2015		2014
	(In thousands)
Lease operating expenses	$	17,220	$	20,709
Employee costs	12,641		31,451
Interest payable	6,321		6,654
Taxes	3,767		3,284
Third-party credits	3,326		2,825
Other	3,643		5,248
Total accrued liabilities	$	46,918	$	70,171

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Long-Term Debt And Other Long-Term Liabilities

12 Months Ended

Dec. 31, 2015

Long-term debt and other long-term liabilites [Abstract]

Long-term Debt

LONG-TERM DEBT AND OTHER LONG-TERM LIABILITIES

Long-Term Debt

Long-term debt consisted of the following as of December 31:

	2015		2014
	(In thousands)
Credit agreement with an average interest rates of 2.6% and 2.9% at December 31, 2015 and 2014, respectively	$	281,000	$	166,000
6.625% senior subordinated notes due 2021, net of unamortized discount of $3.3 million and $3.8 million at December 31, 2015 and 2014, respectively	646,662		646,163
Total long-term debt	$	927,662	$	812,163

Credit Agreement. On April 10, 2015, we amended our Senior Credit Agreement (credit agreement) to extend the maturity date from September 13, 2016 to April 10, 2020. The amount we can borrow is the lesser of the amount we elect (from time to time) as the commitment amount or the value of the borrowing base as determined by the lenders, but in either event not to exceed the maximum credit agreement amount of $900.0 million. Our current commitment amount is $500.0 million. Our current borrowing base is $550.0 million. We are charged a commitment fee ranging from 0.375% to 0.50% on the amount available but not borrowed. The fee varies based on the amount borrowed as a percentage of the amount of the total borrowing base. To date, for this new amendment, we paid $2.6 million in origination, agency, syndication, and other related fees. We are amortizing these fees over the life of the credit agreement.

The amount of the borrowing base–which is subject to redetermination by the lenders on April 1st and October 1st of each year, is based primarily on a percentage of the discounted future value of our oil and natural gas reserves. Effective with the October 2015 redetermination, the lenders under our credit agreement decreased our borrowing base from $725.0 million to $550.0 million. We or the lenders may request a onetime special redetermination of the borrowing base between each scheduled redetermination. In addition, we may request a redetermination following the completion of an acquisition that meets the requirements set forth in the credit agreement.

At our election, any part of the outstanding debt under the credit agreement may be fixed at a London Interbank Offered Rate (LIBOR). LIBOR interest is computed as the sum of the LIBOR base for the applicable term plus 1.75% to 2.50% depending on the level of debt as a percentage of the borrowing base and is payable at the end of each term, or every 90 days, whichever is less. Borrowings not under LIBOR bear interest at the prime rate specified in the credit agreement that in any event cannot be less than LIBOR plus 1.00%. Interest is payable at the end of each month and the principal may be repaid in whole or in part at anytime, without a premium or penalty. At December 31, 2015, we had $281.0 million outstanding borrowings under our credit agreement.

We can use borrowings for financing general working capital requirements for (a) exploration, development, production and acquisition of oil and gas properties, (b) acquisitions and operation of mid-stream assets, (c) issuance of standby letters of credit, (d) contract drilling services, and (e) general corporate purposes.

The credit agreement prohibits, among other things:

• the payment of dividends (other than stock dividends) during any fiscal year in excess of 30% of our consolidated net income for the preceding fiscal year;

• the incurrence of additional debt with certain limited exceptions; and

• the creation or existence of mortgages or liens, other than those in the ordinary course of business, on any of our properties, except in favor of our lenders.

The credit agreement also requires that we have at the end of each quarter:

• a current ratio (as defined in the credit agreement) of not less than 1 to 1; and

• a leverage ratio of funded debt to consolidated EBITDA (as defined in the credit agreement) for the most recently ended rolling four fiscal quarters of no greater than 4 to 1.

As of December 31, 2015, we were in compliance with the covenants contained in the credit agreement.

6.625% Senior Subordinated Notes. We have an aggregate principal amount of $650.0 million, 6.625% senior subordinated notes (the Notes). Interest on the Notes is payable semi-annually (in arrears) on May 15 and November 15 of each year. The Notes will mature on May 15, 2021. In connection with the issuance of the Notes, we incurred $14.7 million of fees that are being amortized as debt issuance cost over the life of the Notes.

The Notes are subject to an Indenture dated as of May 18, 2011, between us and Wilmington Trust, National Association (successor to Wilmington Trust FSB), as Trustee (the Trustee), as supplemented by the First Supplemental Indenture dated as of May 18, 2011, between us, the Guarantors, and the Trustee, and as further supplemented by the Second Supplemental Indenture dated as of January 7, 2013, between us, the Guarantors and the Trustee (as supplemented, the 2011 Indenture), establishing the terms and providing for the issuance of the Notes. The Guarantors are all of our direct and indirect subsidiaries. The discussion of the Notes in this report is qualified by and subject to the actual terms of the 2011 Indenture.

Unit, as the parent company, has no independent assets or operations. The guarantees by the Guarantors of the Notes (registered under registration statements) are full and unconditional, joint and several, subject to certain automatic customary releases, are subject to certain restrictions on the sale, disposition, or transfer of the capital stock or substantially all of the assets of a subsidiary guarantor, and other conditions and terms set out in the Indenture. Any of our subsidiaries that are not Guarantors are minor. There are no significant restrictions on our ability to receive funds from our subsidiaries through dividends, loans, advances or otherwise.

At any time before May 15, 2016, we may redeem the Notes, in whole or in part, at a redemption price equal to 100% of the principal amount plus a “make whole” premium, plus accrued and unpaid interest, if any, to the redemption date. On and after May 15, 2016, we may redeem all or, from time to time, a part of the Notes at certain redemption prices, plus accrued and unpaid interest. If a “change of control” occurs, subject to certain conditions, we must offer to repurchase from each holder all or any part of that holder’s Notes at a purchase price in cash equal to 101% of the principal amount of the Notes plus accrued and unpaid interest, if any, to the date of purchase. The 2011 Indenture contains customary events of default. The 2011 Indenture also contains covenants that, among other things, limit our ability and the ability of certain of our subsidiaries to incur or guarantee additional indebtedness; pay dividends on our capital stock or redeem capital stock or subordinated indebtedness; transfer or sell assets; make investments; incur liens; enter into transactions with our affiliates; and merge or consolidate with other companies. We were in compliance with all covenants of the Notes as of December 31, 2015.

Other Long-Term Liabilities

Other long-term liabilities consisted of the following as of December 31:

	2015		2014
	(In thousands)
ARO liability	$	98,297	$	100,567
Capital lease obligations	22,466		25,876
Workers’ compensation	16,551		17,997
Separation benefit plans	9,886		11,276
Gas balancing liability	5,047		3,623
Deferred compensation plan	4,244		4,055
Other	410		410
	156,901		163,804
Less current portion	16,560		15,019
Total other long-term liabilities	$	140,341	$	148,785

Estimated annual principal payments under the terms of debt and other long-term liabilities from 2016 through 2020 are $16.6 million, $5.7 million, $59.9 million, $9.5 million, and $290.0 million, respectively.

Capital Leases

During 2014, our mid-stream segment entered into capital lease agreements for twenty compressors with initial terms of seven years. The underlying assets are included in gas gathering and processing equipment. The current portion of our capital lease obligations of $3.5 million is included in current portion of other long-term liabilities and the non-current portion of $18.9 million is included in other long-term liabilities in the accompanying Consolidated Balance Sheets as of December 31, 2015. These capital leases are discounted using annual rates of 4.0%. Total maintenance and interest remaining related to these leases are $9.4 million and $2.7 million, respectively at December 31, 2015. Annual payments, net of maintenance and interest, average $4.0 million annually through 2021. At the end of the term, our mid-stream segment has the option to purchase the assets at 10% of the fair market value of the assets at that time.

Future payments required under the capital leases at December 31, 2015 are as follows:

	Amount
Ending December 31,	(In thousands)
2016	$	6,168
2017	6,168
2018	6,168
2019	6,168
2020	6,168
2021	3,769
Total future payments	34,609
Less payments related to:
Maintenance	9,445
Interest	2,698
Present value of future minimum payments	$	22,466

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Asset Retirement Obligations

12 Months Ended

Dec. 31, 2015

Asset Retirement Obligation Disclosure [Abstract]

Asset Retirement Obligations

ASSET RETIREMENT OBLIGATIONS

We are required to record the estimated fair value of the liabilities relating to the future retirement of our long-lived assets (AROs). Our oil and natural gas wells are plugged and abandoned when the oil and natural gas reserves in those wells are depleted or the wells are no longer able to produce. The plugging and abandonment liability for a well is recorded in the period in which the obligation is incurred (at the time the well is drilled or acquired). None of our assets are restricted for purposes of settling these AROs. All of our AROs relate to plugging costs associated with our oil and gas wells.

The following table shows certain information about our AROs for the periods indicated:

	2015			2014
	(In thousands)
ARO liability, January 1:	$	100,567		$	133,657
Accretion of discount	3,453			4,599
Liability incurred	6,754			6,246
Liability settled	(2,893		)	(4,490		)
Liability sold	(421		)	(1,206		)
Revision of estimates (1)	(9,163		)	(38,239		)
ARO liability, December 31:	98,297			100,567
Less current portion	3,965			3,204
Total long-term ARO liability	$	94,332		$	97,363

_________________________

(1) Plugging liability estimates were revised in both 2015 and 2014 for updates in the cost of services used to plug wells over the preceding year. We had various upward and downward adjustments as well as changes in estimated timing of cash flows.

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Income Taxes

12 Months Ended

Dec. 31, 2015

Income Tax Disclosure [Abstract]

Income Taxes

INCOME TAXES

A reconciliation of income tax expense (benefit), computed by applying the federal statutory rate to pre-tax income (loss) to our effective income tax expense (benefit) is as follows:

	2015			2014		2013
	(In thousands)
Income tax expense (benefit) computed by applying the statutory rate	$	(582,508	)	$	78,029	$	105,514
State income tax, net of federal benefit	(45,768		)	6,131		8,290
Statutory depletion and other	1,328			2,503		2,919
Income tax expense (benefit)	$	(626,948	)	$	86,663	$	116,723

For the periods indicated, the total provision for income taxes consisted of the following:

	2015			2014		2013
	(In thousands)
Current taxes:
Federal	$	(20,612	)	$	8,594	$	15,845
State	(4		)	784		146
	(20,616		)	9,378		15,991
Deferred taxes:
Federal	(535,691		)	68,360		87,839
State	(70,641		)	8,925		12,893
	(606,332		)	77,285		100,732
Total provision	$	(626,948	)	$	86,663	$	116,723

Deferred tax assets and liabilities are comprised of the following at December 31:

	2015			2014
	(In thousands)
Deferred tax assets:
Allowance for losses and nondeductible accruals	$	56,479		$	55,231
Net operating loss carryforward	140,863			54,901
Alternative minimum tax and research and development tax credit carryforward	5,409			25,991
	202,751			136,123
Deferred tax liability:
Depreciation, depletion, amortization, and impairment	(464,295		)	(1,000,811		)
Net deferred tax liability	(261,544		)	(864,688		)
Current deferred tax asset	14,206			11,527
Non-current—deferred tax liability	$	(275,750	)	$	(876,215	)

Realization of the deferred tax assets are dependent on generating sufficient future taxable income. Although realization is not assured, management believes it is more likely than not that the deferred tax asset will be realized. The amount of the deferred tax asset considered realizable, however, could be reduced in the near-term if estimates of future taxable income are reduced. At December 31, 2015, we have federal net operating loss carryforwards of approximately $351.4 million which expire from 2021 to 2035.

We file income tax returns in the U.S. federal jurisdiction and various states. We are no longer subject to U.S. federal or state income tax examinations by tax authorities for years before 2012. During 2014, we recognized a tax benefit relating to a research and development tax credit carryforward in conjunction with our BOSS drilling rig activities. Due to the nature and subjectivity surrounding the research and development credit and historical challenges by the IRS against companies who claim the credit, it is our belief that the full amount of the credit may not be eventually allowed by the IRS once we are no longer in an AMT tax paying position. A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows:

	2015		2014		2013
	(In thousands)
Balance at January 1:	$	410	$	—	$	—
Additions based on tax positions related to current year	—		410		—
Additions for tax positions of prior years	—		—		—
Reductions for tax positions of prior years	—		—		—
Settlements	—		—		—
Balance at December 31:	$	410	$	410	$	—

At December 31, 2015 and 2014, there was $0.4 million of unrecognized tax benefits that if recognized would affect the annual effective tax rate. We did not have any unrecognized tax benefits in 2013.

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Employee Benefit Plans

12 Months Ended

Dec. 31, 2015

Employee benefit plans [Abstract]

Employee Benefit Plans

EMPLOYEE BENEFIT PLANS

Under our 401(k) Employee Thrift Plan, employees who meet specified service requirements may contribute a percentage of their total compensation, up to a specified maximum, to the plan. We may match each employee’s contribution, up to a specified maximum, in full or on a partial basis. We made discretionary contributions under the plan of 235,104, 120,333, and 111,995 shares of common stock and recognized expense of $6.2 million, $5.2 million, and $6.0 million in 2015, 2014, and 2013, respectively.

We provide a salary deferral plan (Deferral Plan) which allows participants to defer the recognition of salary for income tax purposes until actual distribution of benefits which occurs at either termination of employment, death or certain defined unforeseeable emergency hardships. The liability recorded under the Deferral Plan at December 31, 2015 and 2014 was $4.2 million and $4.1 million, respectively. We recognized payroll expense and recorded a liability at the time of deferral.

Effective January 1, 1997, we adopted a separation benefit plan (Separation Plan). The Separation Plan allows eligible employees whose employment is involuntarily terminated or, in the case of an employee who has completed 20 years of service, voluntarily or involuntarily terminated, to receive benefits equivalent to four weeks salary for every whole year of service completed up to a maximum of 104 weeks. To receive payments, the recipient must waive any claims against us in exchange for receiving the separation benefits. On October 28, 1997, we adopted a Separation Benefit Plan for Senior Management (Senior Plan). The Senior Plan provides certain officers and key executives of Unit with benefits generally equivalent to the Separation Plan. The Compensation Committee of the Board of Directors has absolute discretion in the selection of the individuals covered in this plan. On May 5, 2004 we also adopted the Special Separation Benefit Plan (Special Plan). This plan is identical to the Separation Benefit Plan with the exception that the benefits under the plan vest on the earliest of a participant’s reaching the age of 65 or serving 20 years with the company.

On December 31, 2008, we amended all three Plans to be in compliance with Section 409A of the Internal Revenue Code of 1986, as amended. The key amendments to the Plans address, among other things, when distributions may be made, the timing of payments, and the circumstances under which employees become eligible to receive benefits. On December 8, 2015, we amended the Plans to change the calculation for determining the payouts at the time of a Separation of Service under the Plans. None of the amendments materially increase the benefits, grants or awards issuable under the Plans. We recognized expense of $3.0 million, $2.7 million, and $2.4 million in 2015, 2014, and 2013, respectively, for benefits associated with anticipated payments from these separation plans.

We have entered into key employee change of control contracts with three of our current executive officers. These severance contracts have an initial three-year term that is automatically extended for one year on each anniversary, unless a notice not to extend is given by us. If a change of control of the company, as defined in the contracts, occurs during the term of the severance contract, then the contract becomes operative for a fixed three-year period. The severance contracts generally provide that the executive’s terms and conditions for employment (including position, work location, compensation, and benefits) will not be adversely changed during the three-year period after a change of control. If the executive’s employment is terminated (other than for cause, death, or disability), the executive terminates for good reason during such three-year period, or the executive terminates employment for any reason during the 30-day period following the first anniversary of the change of control, and on certain terminations prior to a change of control or in connection with or in anticipation of a change of control, the executive is generally entitled to receive, in addition to certain other benefits, any earned but unpaid compensation; up to 2.9 times the executive’s base salary plus annual bonus (based on historic annual bonus); and the company matching contributions that would have been made had the executive continued to participate in the company’s 401(k) plan for up to an additional three years.

The severance contract provides that the executive is entitled to receive a payment in an amount sufficient to make the executive whole for any excise tax on excess parachute payments imposed under Section 4999 of the Code. As a condition to receipt of these severance benefits, the executive must remain in the employ of the company prior to change of control and render services commensurate with his position.

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Transactions With Related Parties

12 Months Ended

Dec. 31, 2015

Related Party Transactions [Abstract]

Transactions With Related Parties

TRANSACTIONS WITH RELATED PARTIES

Unit Petroleum Company serves as the general partner of 15 oil and gas limited partnerships. Two investments by third parties and 13 (the employee partnerships) were formed to allow certain of our qualified employees and our directors to participate in Unit Petroleum’s oil and gas exploration and production operations. The non-employee partnerships were formed in 1984 and two in 1986. Effective December 31, 2014, the 1984 partnership was dissolved. Employee partnerships were formed for each year beginning with 1984 and ending with 2011.

The employee partnerships formed in 1984 through 1990 were consolidated into a single consolidating partnership in 1993 and the employee partnerships formed in 1991 through 1999 were also consolidated into the consolidating partnership in 2002. The consolidation of the 1991 through the 1999 employee partnerships was done by the general partners under the authority contained in the respective partnership agreements and did not involve any vote, consent or approval by the limited partners. The employee partnerships have each had a set percentage (ranging from 1% to 15%) of our interest in most of the oil and natural gas wells we drill or acquire for our own account during the particular year for which the partnership was formed. The total interest the employees have in our oil and natural gas wells by participating in these partnerships does not exceed one percent.

Amounts received in the years ended December 31, from both public and private Partnerships for which Unit is a general partner are as follows:

	2015		2014		2013
	(In thousands)
Contract drilling	$	—	$	4	$	16
Well supervision and other fees	423		435		470
General and administrative expense reimbursement	18		39		36

Related party transactions for contract drilling and well supervision fees are the related party’s share of such costs. These costs are billed to related parties on the same basis as billings to unrelated parties for such services. General and administrative reimbursements are both direct general and administrative expense incurred on the related party’s behalf and indirect expenses allocated to the related parties. Such allocations are based on the related party’s level of activity and are considered by management to be reasonable.

The Chairman of our Board, John Nikkel is a 25.8% owner of Rampart Holdings, Inc. which owns 100% of Toklan Oil and Gas Company (Toklan), an oil and gas exploration and production company located in Tulsa, Oklahoma. Mr. Nikkel's son, Robert Nikkel is Toklan's President, and he owns 20.0% of the company. In 2014, there were two wells drilled for Toklan, one of which was completed in 2014 and one of which was completed in 2015 with no activity in 2013. Under its usual standard dayrate contract terms available generally to all similarly-situated customers at that time and in the same general drilling area, the Company recognized revenue from Toklan of approximately $0.5 million in 2015 and $1.5 million in 2014. During 2014, we received payments of $1.1 million and had an accounts receivable balance of $0.4 million at December 31, 2014. During 2015, we received payments of $0.9 million with no accounts receivable balance at December 31, 2015. The Company also paid royalties in 2014, in the ordinary course of business, of approximately $0.2 million to Toklan. There were no material royalties to disclose for 2013 or 2015. Also in 2015, Toklan paid $0.5 million for the North Custer Gathering System, an inactive (since 2009) gathering system owned by our mid-stream segment. We determined that the capital required to re-activate that system would not provide adequate returns based on future cash flow potential. If the system had not been sold to Toklan, it would have been included in a multi-system asset sales package in which little value would have been assigned to it. Toklan operates the North Custer Gathering System under its affiliate, West Thomas Field Services, LLC (West Thomas), a company in which Mr. John Nikkel holds an approximate 25.0% ownership interest and in which Mr. Robert Nikkel has an ownership interest of approximately 20.0%. West Thomas entered into a gas purchase agreement with our exploration and production segment in November of 2015. Payments from West Thomas under that contract amounted to $0.1 million for 2015 volumes purchased.

One of our directors, G. Bailey Peyton IV, also serves as Manager of Peyton Royalties, LP, a family-controlled limited partnership that owns royalty rights in wells in the Texas and Oklahoma Panhandles. The Company in the ordinary course of business, paid royalties or lease bonuses, primarily due to its status as successor in interest to prior transactions and as operator of the wells involved and, in some cases, as lessee, with respect to certain wells in which Mr. Peyton, members of Mr. Peyton's family, and Peyton Royalties, LP have an interest. Such payments totaled approximately $0.8 million, $1.3 million, and $1.4 million during 2015, 2014, and 2013, respectively. 

Our Audit Committee and the board, in accordance with our related party transaction policy, have determined that these arrangements are in the best interest of the Company.

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Stock-Based Compensation

12 Months Ended

Dec. 31, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock-Based Compensation

STOCK-BASED COMPENSATION

For restricted stock awards, we had:

	2015 (1)		2014		2013
	(In millions)
Recognized stock compensation expense	$	15.3	$	17.4	$	16.1
Capitalized stock compensation cost for our oil and natural gas properties	3.5		3.7		3.5
Tax benefit on stock based compensation	5.8		6.7		6.2

_________________________

(1) Recognized stock compensation was reduced by $3.2 million, capitalized stock compensation cost for our oil and natural gas properties was reduced by $0.2 million, and the tax benefit was reduced by $1.2 million for lower expected payouts related to the performance shares.

The remaining unrecognized compensation cost related to unvested awards at December 31, 2015 is approximately $13.8 million of which $2.4 million is anticipated to be capitalized. The weighted average period of time over which this cost will be recognized is 0.7 of a year.

The Second Amended and Restated Unit Corporation Stock and Incentive Compensation Plan effective May 6, 2015 (the amended plan) allows us to grant stock-based and cash-based compensation to our employees (including employees of subsidiaries) as well as to non-employee directors. A total of 4,500,000 shares of the company's common stock is authorized for issuance to eligible participants under the amended plan with 2.0 million shares being the maximum number of shares that can be issued as “incentive stock options.” Awards under this plan may be granted in any one or a combination of the following:

• incentive stock options under Section 422 of the Internal Revenue Code;

• non-qualified stock options;

• performance shares;

• performance units;

• restricted stock;

• restricted stock units;

• stock appreciation rights;

• cash based awards; and

• other stock-based awards.

This plan also contains various limits as to the amount of awards that can be given to an employee in any fiscal year. All awards are generally subject to the minimum vesting periods, as determined by our Compensation Committee and included in the award agreement.

Expected volatilities are based on the historical volatility of our stock. We use historical data to estimate option exercise and termination rates within the model and aggregate groups that have similar historical exercise behavior for valuation purposes. To date, we have not paid dividends on our stock. The risk free interest rate is computed from the United States Treasury Strips rate using the term over which it is anticipated the grant will be exercised.

SARs

Activity pertaining to SARs granted under the amended plan is as follows:

	Number of Shares		Weighted Average Price
Outstanding at January 1, 2013	145,901		$	46.59
Granted	—		—
Exercised	—		—
Forfeited	—		—
Outstanding at December 31, 2013	145,901		46.59
Granted	—		—
Exercised	(14,131	)	46.50
Forfeited	—		—
Outstanding at December 31, 2014	131,770		46.60
Granted	—		—
Exercised	—		—
Forfeited	—		—
Outstanding at December 31, 2015	131,770		$	46.60

There were no SARs granted or vested during 2015, 2014, or 2013.

	Outstanding and Exercisable SARs at December 31, 2015
Exercise Prices	Number  of Shares	Weighted Average Remaining Contractual Life	Weighted Average Exercise Price
$44.31	91,255	2.0 years	$44.31
$51.76	40,515	0.9 years	$51.76

There were no SARs exercised in 2015. The SARs expire after 10 years from the date of the grant. There was no aggregate intrinsic value on the 131,770 shares outstanding at December 31, 2015. The remaining weighted average contractual term is 1.6 years.

Restricted Stock

Activity pertaining to restricted stock awards granted under the amended plan is as follows:

Employees	Number of Time Vested Shares		Number of Performance Vested Shares		Total Number of Shares		Weighted Average Price
Nonvested at January 1, 2013	523,024		66,503		589,527		$	48.11
Granted	396,144		57,405		453,549		48.20
Vested	(248,003	)	—		(248,003	)	46.46
Forfeited	(18,330	)	—		(18,330	)	47.85
Nonvested at December 31, 2013	652,835		123,908		776,743		48.70
Granted	383,448		71,674		455,122		53.72
Vested	(291,712	)	(13,092	)	(304,804	)	49.68
Forfeited	(19,805	)	(6,970	)	(26,775	)	51.92
Nonvested at December 31, 2014	724,766		175,520		900,286		50.81
Granted	576,361		148,081		724,442		34.06
Vested	(343,657	)	(39,245	)	(382,902	)	49.69
Forfeited	(20,808	)	(7,196	)	(28,004	)	45.33
Nonvested at December 31, 2015	936,662		277,160		1,213,822		$	41.29

Non-Employee Directors	Number of Shares		Weighted Average Price
Nonvested at January 1, 2013	24,606		$	40.23
Granted	21,128		41.65
Vested	(10,030	)	40.23
Forfeited	—		—
Nonvested at December 31, 2013	35,704		$	41.07
Granted	13,768		63.91
Vested	(14,336	)	40.93
Forfeited	—		—
Nonvested at December 31, 2014	35,136		$	50.08
Granted	25,848		34.04
Vested	(18,920	)	46.51
Forfeited	—		—
Nonvested at December 31, 2015	42,064		$	41.83

The time vested restricted stock awards granted are being recognized over a three year vesting period. The performance vested restricted stock awards, granted to certain executive officers, will cliff vest three years from the grant date based on the company's achievement of certain stock performance measures at the end of the term and will range from 0% to 150% of the restricted shares granted as performance shares. Based on a probability assessment of the selected performance criteria at December 31, 2015, the participants are estimated to receive 2% of the 2015, 57% of the 2014, and 10% of the 2013 performance based shares.

The fair value of the restricted stock granted in 2015, 2014, and 2013 at the grant date was $24.5 million, $24.1 million, and $21.3 million, respectively. The aggregate intrinsic value of the 401,822 shares of restricted stock that vested in 2015 on their vesting date was $11.2 million. The aggregate intrinsic value of the 1,255,886 shares of restricted stock outstanding subject to vesting at December 31, 2015 was $15.3 million with a weighted average remaining life of 0.7 of a year.

Employee Stock Option Plan

The Stock Option Plan, provided the granting of options for up to 2,700,000 shares of common stock to officers and employees. The option plan permitted the issuance of qualified or nonqualified stock options. Options granted typically became exercisable at the rate of 20% per year one year after being granted and expire after 10 years from the original grant date. The exercise price for options granted under this plan was the fair market value of the common stock on the date of the grant. In 2006, as a result of the approval of the adoption of the Unit Corporation Stock and Incentive Compensation Plan, no further awards were made under this plan. During 2015, the remaining options expired.

Activity pertaining to the Stock Option Plan is as follows:

	Number of Shares		Weighted Average Exercise Price
Outstanding at January 1, 2013	118,030		$	33.03
Granted	—		—
Exercised	(48,110	)	26.09
Forfeited	(1,000	)	37.83
Outstanding at December 31, 2013	68,920		37.81
Granted	—		—
Exercised	(21,490	)	37.83
Forfeited	(37,930	)	37.83
Outstanding at December 31, 2014	9,500		37.69
Granted	—		—
Exercised	—		—
Forfeited	(9,500	)	37.69
Outstanding at December 31, 2015	—		$	—

There were no shares that vested in 2015, 2014, or 2013. There were no options exercised in 2015 and no options outstanding or exercisable in this plan at December 31, 2015.

Non-Employee Directors' Stock Option Plan

Under the Unit Corporation 2000 Non-Employee Directors’ Stock Option Plan, on the first business day following each annual meeting of shareholders, each person who was then a member of our Board of Directors and who was not then an employee of the company or any of its subsidiaries was granted an option to purchase 3,500 shares of common stock. The option price for each stock option was the fair market value of the common stock on the date the stock options were granted. The term of each option is 10 years and cannot be increased and no stock options were to be exercised during the first six months of its term except in case of death. On May 2, 2012, our stockholders approved the amended plan which succeeds this plan, and no further awards were made under the non-employee director option plan.

Activity pertaining to the Directors’ Plan is as follows:

	Number of Shares		Weighted Average Exercise Price
Outstanding at January 1, 2013	192,500		$	49.39
Granted	—		—
Exercised	(17,500	)	32.53
Forfeited	(3,500	)	20.46
Outstanding at December 31, 2013	171,500		51.70
Granted	—		—
Exercised	(21,000	)	33.94
Forfeited	—		—
Outstanding at December 31, 2014	150,500		54.18
Granted	—		—
Exercised	—		—
Forfeited	(21,000	)	54.35
Outstanding at December 31, 2015	129,500		$	54.15

There were no options exercised in 2015.

	Outstanding and Exercisable Options at December 31, 2015
Weighted Average Exercise Price	Number  of Shares	Weighted Average Remaining Contractual Life	Weighted Average Exercise Price
$31.30 - $41.21	38,500	3.9 years	$	37.58
$53.81 - $73.26	91,000	2.6 years	$	61.16

There was no aggregate intrinsic value of the shares outstanding subject to options at December 31, 2015. The remaining weighted average remaining contractual term is 3.0 years.

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Derivatives

12 Months Ended

Dec. 31, 2015

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivatives

DERIVATIVES

Commodity Derivatives

We have entered into various types of derivative transactions covering some of our projected natural gas, NGLs, and oil production. These transactions are intended to reduce our exposure to market price volatility by setting the price(s) we will receive for that production. Our decisions on the price(s), type, and quantity of our production subject to a derivative contract is based, in part, on our view of current and future market conditions. As of December 31, 2015, our derivative transactions consisted of the following types of hedges:

• Swaps. We receive or pay a fixed price for the commodity and pay or receive a floating market price to the counterparty. The fixed-price payment and the floating-price payment are netted, resulting in a net amount due to or from the counterparty.

• Collars. A collar contains a fixed floor price (put) and a ceiling price (call). If the market price exceeds the call strike price or falls below the put strike price, we receive the fixed price and pay the market price. If the market price is between the call and the put strike price, no payments are due from either party.

• Three-way collars. A three-way collar contains a fixed floor price (long put), fixed subfloor price (short put) and a fixed ceiling price (short call). If the market price exceeds the ceiling strike price, we receive the ceiling strike price and pay the market price. If the market price is between the ceiling and the floor strike price, no payments are due from either party. If the market price is below the floor price but above the subfloor price, we receive the floor strike price and pay the market price. If the market price is below the subfloor price, we receive the market price plus the difference between the floor and subfloor strike prices and pay the market price.

We have documented policies and procedures to monitor and control the use of derivative instruments. We do not engage in derivative transactions for speculative purposes. In August 2012, we determined–on a prospective basis–that we would no longer elect to use cash flow hedge accounting for our economic hedges. As a result, the change in fair value, on all commodity derivatives entered into after that determination, is reflected in the statement of operations and not in accumulated other comprehensive income (OCI). As of December 31, 2013, all cash flow hedges had expired.

At December 31, 2015, the following non-designated hedges were outstanding:

Term	Commodity	Contracted Volume	Weighted Average  Fixed Price for Swaps	Contracted Market
Jan’16 – Dec’16	Natural gas – swap	35,000 MMBtu/day	$2.625	IF – NYMEX (HH)
Jan’16 – Dec'16	Natural gas – collar	42,000 MMBtu/day	$2.40 - $2.88	IF – NYMEX (HH)
Jan’16 – Dec'16	Natural gas – three-way collar	13,500 MMBtu/day	$2.70 - $2.20 - $3.26	IF – NYMEX (HH)
Jan’17 – Dec'17	Natural gas – three-way collar	15,000 MMBtu/day	$2.50 - $2.00 - $3.32	IF – NYMEX (HH)
Jan’16 – Jun'16	Crude oil – collar	2,150 Bbl/day	$46.36 - $55.62	WTI – NYMEX
Jul’16 – Dec'16	Crude oil – collar	1,450 Bbl/day	$47.50 - $56.40	WTI – NYMEX
Jan’16 – Dec'16	Crude oil – three-way collar	700 Bbl/day	$46.50 - $35.00 - $57.00	WTI – NYMEX
Jul’16 – Dec'16	Crude oil – three-way collar (1)	700 Bbl/day	$47.50 - $35.00 - $63.50	WTI – NYMEX
Jan’17 – Dec'17	Crude oil – three-way collar	750 Bbl/day	$50.00 - $37.50 - $63.90	WTI – NYMEX

_________________________

(1) We pay our counterparty a premium, which can be and is being deferred until settlement.

Subsequent to December 31, 2015, the following non-designated hedges were entered into:

Term	Commodity	Contracted Volume	Weighted Average  Fixed Price for Swaps	Contracted Market
Feb’16 – Dec'16	Natural gas – swap	10,000 MMBtu/day	$2.495	IF – NYMEX (HH)
Jan’17 – Dec'17	Natural gas – swap	10,000 MMBtu/day	$2.795	IF – NYMEX (HH)

The following tables present the fair values and locations of the derivative transactions recorded in our Consolidated Balance Sheets at December 31:

		Derivative Assets Fair Value
	Balance Sheet Location	2015		2014
		(In thousands)
Commodity derivatives:
Current	Current derivative assets	$	10,186	$	31,139
Long-term	Non-current derivative assets	968		—
Total derivative assets		$	11,154	$	31,139

		Derivative Liabilities Fair Value
	Balance Sheet Location	2015		2014
		(In thousands)
Commodity derivatives:
Current	Current derivative liabilities	$	—	$	—
Long-term	Non-current derivative liabilities	285		—
Total derivative liabilities		$	285	$	—

If a legal right of set-off exists, we net the value of the derivative transactions we have with the same counterparty in our Consolidated Balance Sheets.

For hedges designated under cash flow accounting, we recognized in OCI the effective portion of any changes in fair value and reclassified the recognized gains (losses) on the sales to oil and natural gas revenue as the underlying transactions were settled. Because our cash flow hedges expired as of December 31, 2013, we had no balance in accumulated OCI at December 31, 2015 or 2014.

Effect of Derivative Instruments on the Consolidated Statements of Operations (derivatives not designated as hedging instruments) for the year ended December 31:

Derivatives Not Designated as Hedging Instruments	Location of Gain or (Loss) Recognized in Income on Derivative	Amount of Gain or (Loss) Recognized in Income on  Derivative
		2015		2014
		(In thousands)
Commodity derivatives	Gain on derivatives not designated as hedges and hedge ineffectiveness, net (1)	$	26,345	$	30,147
Total		$	26,345	$	30,147

_________________________

(1) Amount settled during the period is a gain of $46,615 and a loss of $6,038, respectively.

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Fair Value Measurements

12 Months Ended

Dec. 31, 2015

Fair Value Disclosures [Abstract]

Fair Value Measurements

FAIR VALUE MEASUREMENTS

Fair value is defined as the amount that would be received from the sale of an asset or paid for the transfer of a liability in an orderly transaction between market participants (in either case, an exit price). To estimate an exit price, a three-level

hierarchy is used prioritizing the valuation techniques used to measure fair value into three levels with the highest priority given to Level 1 and the lowest priority given to Level 3. The levels are summarized as follows:

• Level 1—unadjusted quoted prices in active markets for identical assets and liabilities.

• Level 2—significant observable pricing inputs other than quoted prices included within level 1 that are either directly or indirectly observable as of the reporting date. Essentially, inputs (variables used in the pricing models) that are derived principally from or corroborated by observable market data.

• Level 3—generally unobservable inputs which are developed based on the best information available and may include our own internal data.

The inputs available to us determine the valuation technique we use to measure the fair values of our financial instruments.

The following tables set forth our recurring fair value measurements:

	December 31, 2015
	Level 2			Level 3			Effect of Netting			Total
	(In thousands)
Financial assets (liabilities):
Commodity derivatives:
Assets	$	2,794		$	10,145		$	(1,785	)	$	11,154
Liabilities	(1,019		)	(1,051		)	1,785			(285		)
	$	1,775		$	9,094		$	—		$	10,869

	December 31, 2014
	Level 2		Level 3		Effect of Netting		Total
	(In thousands)
Financial assets (liabilities):
Commodity derivatives:
Assets	$	27,784	$	3,355	$	—	$	31,139
Liabilities	—		—		—		—
	$	27,784	$	3,355	$	—	$	31,139

All of our counterparties are subject to master netting arrangements. If a legal right of set-off exists, we net the value of the derivative transactions we have with the same counterparty. We are not required to post any cash collateral with our counterparties and no collateral has been posted as of December 31, 2015.

The following methods and assumptions were used to estimate the fair values of the assets and liabilities in the table above.

Level 2 Fair Value Measurements

Commodity Derivatives. We measure the fair values of our crude oil and natural gas swaps using estimated internal discounted cash flow calculations based on the NYMEX futures index.

Level 3 Fair Value Measurements

Commodity Derivatives. The fair values of our natural gas and crude oil collars are estimated using internal discounted cash flow calculations based on forward price curves, quotes obtained from brokers for contracts with similar terms, or quotes obtained from counterparties to the agreements.

The following tables are reconciliations of our level 3 fair value measurements:

	Net Derivatives
	For the Year Ended,
	December 31, 2015			December 31, 2014
	(In thousands)
Beginning of period	$	3,355		$	(2,595	)
Total gains or losses:
Included in earnings (1)	15,260			6,108
Settlements	(9,521		)	(158		)
End of period	$	9,094		$	3,355
Total gains for the period included in earnings attributable to the change in unrealized loss relating to assets still held at end of period	$	5,739		$	5,950

_________________________

(1) Commodity derivatives are reported in the Consolidated Statements of Operations in gain (loss) on derivatives not designated as hedges and hedge ineffectiveness, net.

The following table provides quantitative information about our Level 3 unobservable inputs at December 31, 2015:

Commodity (1)	Fair Value		Valuation Technique	Unobservable Input	Range
	(In thousands)
Oil collars	$	3,893	Discounted cash flow	Forward commodity price curve	$0.40 - $55.05
Oil three-way collar	3,470		Discounted cash flow	Forward commodity price curve	$0.40 - $71.66
Natural gas collar	1,000		Discounted cash flow	Forward commodity price curve	$0.40 - $1.26
Natural gas three-way collar	731		Discounted cash flow	Forward commodity price curve	$0.40 - $1.93

 _________________________

(1) The commodity contracts detailed in this category include non-exchange-traded crude oil and natural gas collars and three-way collars that are valued based on NYMEX. The forward pricing range represents the low and high price expected to be received within the settlement period.

Based on our valuation at December 31, 2015, we determined that the non-performance risk with regard to our counterparties was immaterial.

Fair Value of Other Financial Instruments

The following disclosure of the estimated fair value of financial instruments is made in accordance with accounting guidance for financial instruments. We have determined the estimated fair values by using available market information and valuation methodologies. Considerable judgment is required in interpreting market data to develop the estimates of fair value. The use of different market assumptions or valuation methodologies may have a material effect on the estimated fair value amounts.

At December 31, 2015, the carrying values on the consolidated balance sheets for cash and cash equivalents (classified as Level 1), accounts receivable, accounts payable, other current assets, and current liabilities approximate their fair value because of their short term nature.

Based on the borrowing rates currently available to us for credit agreement debt with similar terms and maturities and also considering the risk of our non-performance, long-term debt under our credit agreement at December 31, 2015 approximates its fair value. This debt would be classified as Level 2.

The carrying amounts of long-term debt, net of unamortized discount, associated with the Notes reported in the Consolidated Balance Sheets at December 31, 2015 and December 31, 2014 were $646.7 million and $646.2 million, respectively. We estimate the fair value of these Notes using quoted marked prices at December 31, 2015 and December 31, 2014 were $455.5 million and $605.5 million, respectively. These Notes would be classified as Level 2.

Fair Value of Non-Financial Instruments

The initial measurement of AROs at fair value is calculated using discounted cash flow techniques and based on internal estimates of future retirement costs associated with property, plant, and equipment. Significant Level 3 inputs used in the calculation of AROs include plugging costs and remaining reserve lives. A reconciliation of the Company’s AROs is presented in Note 7 – Asset Retirement Obligations.

Non-recurring fair value measurements are also applied, when applicable, to determine the fair value of our long-lived assets and goodwill. During 2015 and 2014, we recorded non-cash impairment charges discussed further in Note 2 – Summary of Significant Accounting Policies. The valuation of these assets require the use of significant unobservable inputs classified as Level 3.

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Accumulated Other Comprehensive Income

12 Months Ended

Dec. 31, 2015

Equity [Abstract]

Accumulated other comprehensive income

ACCUMULATED OTHER COMPREHENSIVE INCOME

Changes in accumulated other comprehensive income (loss) by component, net of tax, are as follows:

	Net Gains (Losses) on Cash Flow Hedges
	2015		2014		2013
	(In thousands)
Balance at January 1:	$	—	$	—	$	7,587
Other comprehensive income before reclassification	—		—		(7,349		)
Amounts reclassified from accumulated other comprehensive income	—		—		(238		)
New current-period other comprehensive income	—		—		(7,587		)
Balance at December 31:	$	—	$	—	$	—

Amounts reclassified from accumulated other comprehensive income (loss) into the Consolidated Statements of Operations for the year ended December 31:

	2015		2014		2013			Affected Line Item in the Statement Where Net Income is Presented
	(In thousands)
Net gains (loss) on cash flow hedges
Commodity derivatives	$	—	$	—	$	603		Oil and natural gas revenues
Commodity derivatives	—		—		(190		)	Gain (loss) on derivatives not designated as hedges and hedge ineffectiveness, net
	—		—		413			Total before tax
	—		—		(175		)	Tax expense
Total reclassification for the period	$	—	$	—	$	238		Net of tax

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Commitments And Contingencies

12 Months Ended

Dec. 31, 2015

Commitments and Contingencies Disclosure [Abstract]

Commitments And Contingencies

COMMITMENTS AND CONTINGENCIES

We lease office space or yards in Edmond, Oklahoma City, and Tulsa, Oklahoma; Houston, Texas; Englewood, Colorado; Pinedale, Wyoming; and Pittsburgh, Pennsylvania under the terms of operating leases expiring through December 2021. Additionally, we have several compressor rentals, equipment leases, and lease space on short-term commitments to stack excess drilling rig equipment and production inventory.Future minimum rental payments under the terms of the leases are approximately $6.4 million, $1.0 million, and $0.7 million, in 2016 through 2018, respectively and less than $0.1 million each in 2019 and 2020. Total rent expense incurred was $12.9 million, $13.6 million, and $16.9 million in 2015, 2014, and 2013, respectively.

During 2014, our mid-stream segment entered into capital lease agreements for twenty compressors with initial terms of seven years. Future capital lease payments under the terms are approximately $6.2 million each year through 2020 and approximately $3.8 million in 2021. Total maintenance and interest remaining related to these leases are $9.4 million and $2.7 million, respectively at December 31, 2015. Annual payments, net of maintenance and interest, average $4.0 million annually

through 2021. At the end of the term, our mid-stream segment has the option to purchase the assets at 10% of the fair market value of the assets at that time.

The Unit 1984 Oil and Gas Limited Partnership and the 1986 Energy Income Limited Partnership agreements along with the employee oil and gas limited partnerships require, on the election of a limited partner, that we repurchase the limited partner’s interest at amounts to be determined by appraisal in the future. These repurchases in any one year are limited to 20% of the units outstanding. We made repurchases of $118,000, $45,000, $16,000 in 2015, 2014, and 2013, respectively. Effective December 31, 2014, the Unit 1984 Oil and Gas Limited Partnership was dissolved.

We manage our exposure to environmental liabilities on properties to be acquired by identifying existing problems and assessing the potential liability. We also conduct periodic reviews, on a company-wide basis, to identify changes in our environmental risk profile. These reviews evaluate whether there is a probable liability, its amount, and the likelihood that the liability will be incurred. The amount of any potential liability is determined by considering, among other matters, incremental direct costs of any likely remediation and the proportionate cost of employees who are expected to devote a significant amount of time directly to any possible remediation effort. As it relates to evaluations of purchased properties, depending on the extent of an identified environmental problem, we may exclude a property from the acquisition, require the seller to remediate the property to our satisfaction, or agree to assume liability for the remediation of the property.

We have not historically experienced any environmental liability while being a contract driller since the greatest portion of risk is borne by the operator. Any liabilities we have incurred have been small and have been resolved while the drilling rig is on the location and the cost has been included in the direct cost of drilling the well.

For 2016, we have committed to purchase approximately $6.7 million of new drilling rig components, drill pipe, drill collars, and related equipment. We have also committed to paying $1.4 million for Enterprise Resource Planning software over the next year and then $0.5 million for maintenance one year following implementation.

We are subject to various legal proceedings arising in the ordinary course of our various businesses none of which, in our opinion, will result in judgments which would have a material adverse effect on our financial position, operating results or cash flows.

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Industry Segment Information

12 Months Ended

Dec. 31, 2015

Segment Reporting [Abstract]

Industry Segment Information

INDUSTRY SEGMENT INFORMATION

We have three main business segments offering different products and services:

• Oil and natural gas,

• Contract drilling, and

• Mid-stream

The oil and natural gas segment is engaged in the development, acquisition, and production of oil, NGLs, and natural gas properties. The contract drilling segment is engaged in the land contract drilling of oil and natural gas wells and the mid-stream segment is engaged in the buying, selling, gathering, processing, and treating of natural gas and NGLs.

We evaluate each segment’s performance based on its operating income, which is defined as operating revenues less operating expenses and depreciation, depletion, amortization, and impairment. Our oil and natural gas production outside the United States is not significant.

The following table provides certain information about the operations of each of our segments:

	2015				2014				2013
	(In thousands)
Revenues:
Oil and natural gas	$	385,774			$	740,079			$	649,718
Contract drilling	287,767				566,012				479,091
Elimination of inter-segment revenue	(22,099		)		(89,495		)		(64,313		)
Contract drilling net of inter-segment revenue	265,668				476,517				414,778
Gas gathering and processing	268,012				445,934				378,397
Elimination of inter-segment revenue	(65,223		)		(89,586		)		(91,043		)
Gas gathering and processing net of inter-segment revenue	202,789				356,348				287,354
Total revenues	$	854,231			$	1,572,944			$	1,351,850
Operating income (loss):
Oil and natural gas	$	(1,631,564	)	(4)	$	199,392		(4)	$	239,219
Contract drilling	44,811			(5)	41,896			(5)	96,304
Gas gathering and processing	(29,409		)	(6)	2,015			(6)	10,757
Total operating income (loss) (1)	(1,616,162		)		243,303				346,280
General and administrative	(35,345		)		(42,023		)		(38,323		)
Gain (loss) on disposition of assets	(7,229		)		8,953				17,076
Interest expense, net	(31,963		)		(17,371		)		(15,015		)
Gain (loss) on derivatives not designated as hedges and hedge ineffectiveness, net	26,345				30,147				(8,374		)
Other	45				(70		)		(175		)
Income (loss) before income taxes	$	(1,664,309	)		$	222,939			$	301,469
Identifiable assets:
Oil and natural gas	$	1,218,036			$	2,856,833			$	2,441,792
Contract drilling	993,015				1,059,980				1,042,661
Gas gathering and processing	478,661				500,255				473,717
Total identifiable assets (2)	2,689,712				4,417,068				3,958,170
Corporate assets	118,797				56,660				64,220
Total assets	$	2,808,509			$	4,473,728			$	4,022,390
Capital expenditures:
Oil and natural gas	$	267,944			$	740,262			$	531,233
Contract drilling	84,802				176,683				64,325
Gas gathering and processing	63,476				79,268			(3)	96,085
Other	38,065				17,067				4,483
Total capital expenditures	$	454,287			$	1,013,280			$	696,126
Depreciation, depletion, amortization, and impairment:
Oil and natural gas:
Depreciation, depletion, and amortization	$	251,944			$	276,088			$	226,498
Impairment of oil and natural gas properties	1,599,348			(4)	76,683			(4)	—
Contract drilling:
Depreciation	56,135				85,370				71,194
Impairment of contract drilling equipment	8,314			(5)	74,318			(5)	—
Gas gathering and processing:
Depreciation and amortization	43,676				40,434				33,191
Impairment of gas gathering and processing systems	26,966			(6)	7,068			(6)	—
Other	3,075				3,051				3,024
Total depreciation, depletion, amortization, and impairment	$	1,989,458			$	563,012			$	333,907

_______________________ 

(1) Operating income (loss) is total operating revenues less operating expenses, depreciation, depletion, amortization, and impairment and does not include general corporate expenses, gain (loss) on disposition of assets, gain (loss) on non-designated hedges and hedge ineffectiveness, net, interest expense, other income (loss), or income taxes.

(2) Identifiable assets are those used in Unit’s operations in each industry segment. Corporate assets are principally cash and cash equivalents, short-term investments, corporate leasehold improvements, furniture, and equipment.

(3) In 2014, we entered into capital leases for $28.2 million.

(4) In 2015 and 2014, we incurred non-cash ceiling test write-downs of our oil and natural gas properties of $1.6 billion and $76.7 million pre-tax ($1.0 billion and $47.7 million, net of tax), respectively.

(5) Impairment for contract drilling equipment for 2015 includes a $8.3 million pre-tax write-down and 2014 includes a $74.3 million pre-tax write-down for 31 drilling rigs, some older top drives, and certain drill pipe removed from service.

(6) Impairment for gas gathering and processing systems for 2015 includes a $27.0 million pre-tax write-down for three of our systems, Bruceton Mills, Midwell, and Spring Creek. For 2014, it includes a $7.1 million pre-tax write-down for three of our systems, Weatherford, Billy Rose, and Spring Creek.

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Selected Quarterly Financial Information

12 Months Ended

Dec. 31, 2015

Selected Quarterly Financial Information [Abstract]

Selected Quarterly Financial Information

SELECTED QUARTERLY FINANCIAL INFORMATION

Summarized unaudited quarterly financial information is as follows:

	Three Months Ended
	March 31			June 30			September 30			December 31
	(In thousands except per share amounts)
2014
Revenues	$	387,988		$	405,431		$	400,974		$	378,551
Gross profit (loss) (1)	$	115,143		$	113,973		$	103,983		$	(89,796	)
Net income (loss)	$	56,945		$	54,360		$	67,522		$	(42,551	)
Net income (loss) per common share:
Basic	$	1.17		$	1.12		$	1.39		$	(0.88	)
Diluted (2)	$	1.17		$	1.11		$	1.37		$	(0.88	)
2015
Revenues	$	255,099		$	214,447		$	212,393		$	172,292
Gross loss (1)	$	(389,451	)	$	(419,666	)	$	(314,409	)	$	(492,636	)
Net loss	$	(248,354	)	$	(274,389	)	$	(205,281	)	$	(309,337	)
Net loss per common share:
Basic	$	(5.07	)	$	(5.58	)	$	(4.18	)	$	(6.29	)
Diluted	$	(5.07	)	$	(5.58	)	$	(4.18	)	$	(6.29	)

_________________________

(1) Gross profit (loss) excludes general and administrative expense, interest expense, (gain) loss on disposition of assets, gain (loss) on non-designated hedges and hedge ineffectiveness, net, income taxes, and other income (loss).

(2) Due to the effect of the loss in the fourth quarter, the diluted earnings per share for the year's four quarters does not equal annual earnings per share.

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Supplemental Oil And Gas Disclosures

12 Months Ended

Dec. 31, 2015

Supplemental Oil and Gas Disclosures [Abstract]

Supplemental Oil And Gas Disclosures

SUPPLEMENTAL OIL AND GAS DISCLOSURES

(UNAUDITED)

Our oil and gas operations are substantially located in the United States. The capitalized costs at year-end and costs incurred during the year were as follows:

	2015			2014			2013
	(In thousands)
Capitalized costs:
Proved properties	$	5,401,618		$	4,990,753		$	4,235,712
Unproved properties	337,099			485,568			545,588
	5,738,717			5,476,321			4,781,300
Accumulated depreciation, depletion, amortization, and impairment	(4,631,404		)	(2,786,678		)	(2,439,458		)
Net capitalized costs	$	1,107,313		$	2,689,643		$	2,341,842
Cost incurred:
Unproved properties acquired	$	41,777		$	76,041		$	76,304
Proved properties acquired	179			5,723			—
Exploration	19,222			68,811			33,373
Development	208,845			615,252			424,314
Asset retirement obligation	(5,693		)	(37,687		)	(17,951		)
Total costs incurred	$	264,330		$	728,140		$	516,040

The following table shows a summary of the oil and natural gas property costs not being amortized at December 31, 2015, by the year in which such costs were incurred:

	2015		2014		2013		2012 and Prior		Total
	(In thousands)
Unproved properties acquired and wells in progress	$	49,283	$	65,970	$	44,607	$	177,239	$	337,099

Unproved properties not subject to amortization relates to properties which are not individually significant and consist primarily of lease acquisition costs. The evaluation process associated with these properties has not been completed and therefore, the company is unable to estimate when these costs will be included in the amortization calculation.

The results of operations for producing activities are as follows:

	2015			2014			2013
	(In thousands)
Revenues	$	371,335		$	723,566		$	633,792
Production costs	(152,560		)	(165,315		)	(162,822		)
Depreciation, depletion, amortization, and impairment	(1,844,726		)	(347,220		)	(222,672		)
	(1,625,951		)	211,031			248,298
Income tax (expense) benefit	612,496			(82,028		)	(96,091		)
Results of operations for producing activities (excluding corporate overhead and financing costs)	$	(1,013,455	)	$	129,003		$	152,207

Estimated quantities of proved developed oil, NGLs, and natural gas reserves and changes in net quantities of proved developed and undeveloped oil, NGLs, and natural gas reserves were as follows:

	Oil Bbls		NGLs Bbls		Natural Gas Mcf
	(In thousands)
2013
Proved developed and undeveloped reserves:
Beginning of year	21,998		35,166		555,647
Revision of previous estimates (1)	(2,113	)	836		2,421
Extensions and discoveries	4,678		7,273		68,611
Infill reserves in existing proved fields	2,299		1,945		21,573
Purchases of minerals in place	—		—		11
Production	(3,360	)	(3,914	)	(56,757	)
Sales	(1,737	)	(101	)	(9,722	)
End of year	21,765		41,205		581,784
Proved developed reserves:
Beginning of year	16,441		25,657		452,844
End of year	15,594		30,437		464,234
Proved undeveloped reserves:
Beginning of year	5,557		9,509		102,803
End of year	6,171		10,768		117,550
2014
Proved developed and undeveloped reserves:
Beginning of year	21,765		41,205		581,784
Revision of previous estimates (1)	(3,174	)	(2,266	)	(32,790	)
Extensions and discoveries	5,327		10,850		113,541
Infill reserves in existing proved fields	2,775		3,577		47,189
Purchases of minerals in place	236		88		368
Production	(3,844	)	(4,629	)	(58,854	)
Sales	(418	)	(296	)	(4,277	)
End of year	22,667		48,529		646,961
Proved developed reserves:
Beginning of year	15,594		30,437		464,234
End of year	17,448		35,850		500,950
Proved undeveloped reserves:
Beginning of year	6,171		10,768		117,550
End of year	5,219		12,679		146,011
2015
Proved developed and undeveloped reserves:
Beginning of year	22,667		48,529		646,961
Revision of previous estimates (1)	(3,954	)	(9,367	)	(139,514	)
Extensions and discoveries	1,208		1,948		20,974
Infill reserves in existing proved fields	670		1,861		22,641
Purchases of minerals in place	—		—		—
Production	(3,783	)	(5,274	)	(65,546	)
Sales	(73	)	(10	)	(648	)
End of year	16,735		37,687		484,868
Proved developed reserves:
Beginning of year	17,448		35,850		500,950
End of year	14,679		31,218		416,395
Proved undeveloped reserves:
Beginning of year	5,219		12,679		146,011
End of year	2,056		6,469		68,473

_________________________

(1) Natural gas revisions of previous estimates decreased primarily due to a decline in natural gas prices.

Estimates of oil, NGLs, and natural gas reserves require extensive judgments of reservoir engineering data. Assigning monetary values to such estimates does not reduce the subjectivity and changing nature of such reserve estimates. Indeed the uncertainties inherent in the disclosure are compounded by applying additional estimates of the rates and timing of production and the costs that will be incurred in developing and producing the reserves. The information set forth in this report is, therefore, subjective and, since judgments are involved, may not be comparable to estimates submitted by other oil and natural gas producers. In addition, since prices and costs do not remain static, and no price or cost escalations or de-escalations have been considered, the results are not necessarily indicative of the estimated fair market value of estimated proved reserves, nor of estimated future cash flows.

The standardized measure of discounted future net cash flows (SMOG) was calculated using 12-month average prices and year-end costs and statutory tax rates, adjusted for permanent differences that relate to existing proved oil, NGLs, and natural gas reserves. SMOG as of December 31 is as follows:

	2015			2014			2013
	(In thousands)
Future cash flows	$	2,475,898		$	6,398,236		$	5,573,119
Future production costs	(1,017,777		)	(2,069,636		)	(1,734,985		)
Future development costs	(228,445		)	(560,102		)	(571,170		)
Future income tax expenses	(230,544		)	(1,228,533		)	(1,044,608		)
Future net cash flows	999,132			2,539,965			2,222,356
10% annual discount for estimated timing of cash flows	(409,646		)	(1,104,221		)	(996,380		)
Standardized measure of discounted future net cash flows relating to proved oil, NGLs, and natural gas reserves	$	589,486		$	1,435,744		$	1,225,976

The principal sources of changes in the standardized measure of discounted future net cash flows were as follows:

	2015			2014			2013
	(In thousands)
Sales and transfers of oil and natural gas produced, net of production costs	$	(218,115	)	$	(558,252	)	$	(470,970	)
Net changes in prices and production costs	(1,356,333		)	(33,259		)	188,826
Revisions in quantity estimates and changes in production timing	(213,945		)	(135,125		)	(10,650		)
Extensions, discoveries, and improved recovery, less related costs	95,671			635,752			426,377
Changes in estimated future development costs	227,857			96,339			26,629
Previously estimated cost incurred during the period	59,117			164,430			96,457
Purchases of minerals in place	—			8,395			9
Sales of minerals in place	(3,338		)	(19,135		)	(43,435		)
Accretion of discount	209,979			179,190			147,579
Net change in income taxes	562,838			(98,119		)	(170,091		)
Other—net	(209,989		)	(30,448		)	(44,711		)
Net change	(846,258		)	209,768			146,020
Beginning of year	1,435,744			1,225,976			1,079,956
End of year	$	589,486		$	1,435,744		$	1,225,976

Certain information concerning the assumptions used in computing SMOG and their inherent limitations are discussed below. We believe this information is essential for a proper understanding and assessment of the data presented.

The assumptions used to compute SMOG do not necessarily reflect our expectations of actual revenues to be derived from those reserves nor their present worth. Assigning monetary values to the reserve quantity estimation process does not reduce the subjective and ever-changing nature of reserve estimates. Additional subjectivity occurs when determining present values because the rate of producing the reserves must be estimated. In addition to difficulty inherent in predicting the future, variations from the expected production rate could result from factors outside of our control, such as unintentional delays in development, environmental concerns or changes in prices or regulatory controls. Also, the reserve valuation assumes that all reserves will be disposed of by production. However, other factors such as the sale of reserves in place could affect the amount of cash eventually realized.

The December 31, 2015, future cash flows were computed by applying the unescalated 12-month average prices of $50.28 per barrel for oil, $19.47 per barrel for NGLs, and $2.59 per Mcf for natural gas (then adjusted for price differentials) relating to proved reserves and to the year-end quantities of those reserves. Future price changes are considered only to the extent provided by contractual arrangements in existence at year-end.

Future production and development costs are computed by estimating the expenditures to be incurred in developing and producing the proved oil, NGLs, and natural gas reserves at the end of the year, based on continuation of existing economic conditions.

Future income tax expenses are computed by applying the appropriate year-end statutory tax rates to the future pretax net cash flows relating to proved oil, NGLs, and natural gas reserves less the tax basis of our properties. The future income tax expenses also give effect to permanent differences and tax credits and allowances relating to our proved oil, NGLs, and natural gas reserves.

Care should be exercised in the use and interpretation of the above data. As production occurs over the next several years, the results shown may be significantly different as changes in production performance, petroleum prices and costs are likely to occur.

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Schedule II - Valuation And Qualifying Accounts And Reserves

12 Months Ended

Dec. 31, 2015

Valuation and Qualifying Accounts [Abstract]

Valuation And Qualifying Accounts And Reserves

Allowance for Doubtful Accounts:

Description	Balance at Beginning of Period		Additions Charged to Costs & Expenses		Deductions & Net Write-Offs			Balance at End of Period
	(In thousands)
Year ended December 31, 2015	$	5,039	$	1,191	$	(1,031	)	$	5,199
Year ended December 31, 2014	$	5,342	$	3,562	$	(3,865	)	$	5,039
Year ended December 31, 2013	$	5,343	$	—	$	(1	)	$	5,342

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Summary Of Significant Accounting Policies (Policy)

12 Months Ended

Dec. 31, 2015

Accounting Policies [Abstract]

Principles of Consolidation

The consolidated financial statements include the accounts of Unit Corporation and its subsidiaries. Our investment in limited partnerships is accounted for on the proportionate consolidation method, whereby our share of the partnerships’ assets, liabilities, revenues, and expenses are included in the appropriate classification in the accompanying consolidated financial statements.

Certain amounts in the accompanying consolidated financial statements for prior periods have been reclassified to conform to current year presentation. Certain financial statement captions were expanded or combined with no impact to consolidated net income or shareholders' equity.

Accounting Estimates

The preparation of financial statements in conformity with generally accepted accounting principles (GAAP) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.

Drilling Contracts

We recognize revenues and expenses generated from “daywork” drilling contracts as the services are performed, since we do not bear the risk of completion of the well. Under “footage” and “turnkey” contracts, we bear the risk of completion of the well; therefore, revenues and expenses are recognized when the well is substantially completed. Under this method, substantial completion is determined when the well bore reaches the negotiated depth as stated in the contract. The entire amount of a loss, if any, is recorded when the loss is determinable. The costs of uncompleted drilling contracts include expenses incurred to date on “footage” or “turnkey” contracts, which are still in process at the end of the period, and are included in other current assets. Typically, any one of these three types of contracts can be used for the drilling of one well which can take from 10 to 90 days. At December 31, 2015, all of our contracts were daywork contracts of which nine were multi-well and had durations which ranged from six months to three years, five of which expire in 2016 and four expiring in 2017. These longer term contracts may contain a fixed rate for the duration of the contract or provide for the periodic renegotiation of the rate within a specific range from the existing rate.

Cash Equivalents and Book Overdrafts

We include as cash equivalents all investments with maturities at date of purchase of three months or less which are readily convertible into known amounts of cash. Book overdrafts are checks that have been issued before the end of the period, but not presented to our bank for payment before the end of the period. At December 31, 2015 and 2014, book overdrafts were $22.1 million and $27.8 million, respectively.

Accounts Receivable

Accounts receivable are carried on a gross basis, with no discounting, less an allowance for doubtful accounts. We estimate the allowance for doubtful accounts based on existing economic conditions, the financial condition of our customers, and the amount and age of past due accounts. Receivables are considered past due if full payment is not received by the contractual due date. Past due accounts are generally written off against the allowance for doubtful accounts only after all collection attempts have been unsuccessful.

Financial Instruments and Concentrations Of Credit Risk and Non-Performance Risk

Financial instruments, which potentially subject us to concentrations of credit risk, consist primarily of trade receivables with a variety of oil and natural gas companies. We do not generally require collateral related to receivables. Our credit risk is considered to be limited due to the large number of customers comprising our customer base. Below are the third-party customers that accounted for more than 10% of our segment’s revenues:

	2015		2014		2013
Oil and Natural Gas:
Sunoco Logistics Partners L.P.	19	%	14	%	8	%
Valero Energy Corporation	15	%	24	%	25	%
Drilling:
QEP Resources, Inc.	25	%	19	%	18	%
Whiting Petroleum Corp. (formerly Kodiak Oil and Gas Corp.)	7	%	9	%	10	%
Mid-Stream:
ONEOK Partners, L.P.	29	%	44	%	57	%
Tenaska Resources, LLC	18	%	22	%	16	%
Laclede Group, Inc.	12	%	16	%	7	%

We had a concentration of cash of $2.3 million and $18.4 million at December 31, 2015 and 2014, respectively with one bank.

The use of derivative transactions also involves the risk that the counterparties will be unable to meet the financial terms of the transactions. We considered this non-performance risk with regard to our counterparties and our own non-performance risk in our derivative valuation at December 31, 2015 and determined there was no material risk at that time. At December 31, 2015, the fair values of the net assets we had with each of the counterparties with respect to all of our commodity derivative transactions are listed in the table below:

	December 31, 2015
	(In millions)
Canadian Imperial Bank of Commerce	$	8.7
Bank of Montreal	1.1
Scotiabank	0.7
Bank of America Merrill Lynch	0.4
Total assets	$	10.9

Property and Equipment

Drilling equipment, transportation equipment, gas gathering and processing systems, and other property and equipment are carried at cost less accumulated depreciation. Renewals and enhancements are capitalized while repairs and maintenance are expensed. Depreciation of drilling equipment is recorded using the units-of-production method based on estimated useful lives starting at 15 years , including a minimum provision of 20% of the active rate when the equipment is idle. We use the composite method of depreciation for drill pipe and collars and calculate the depreciation by footage actually drilled compared to total estimated remaining footage. Depreciation of other property and equipment is computed using the straight-line method over the estimated useful lives of the assets ranging from 3 to 15 years.

We review the carrying amounts of long-lived assets for potential impairment annually, typically during the fourth quarter, or when events occur or changes in circumstances suggest that these carrying amounts may not be recoverable. Changes that could prompt such an assessment may include equipment obsolescence, changes in the market demand for a specific asset, changes in commodity prices, periods of relatively low drilling rig utilization, declining revenue per day, declining cash margin per day, or overall changes in general market conditions. Assets are determined to be impaired if a forecast of undiscounted estimated future net operating cash flows directly related to the asset, including disposal value if any, is less than the carrying amount of the asset. If any asset is determined to be impaired, the loss is measured as the amount by which the carrying amount of the asset exceeds its fair value. The estimate of fair value is based on the best information available, including prices for similar assets. Changes in these estimates could cause us to reduce the carrying value of property and equipment.Asset impairment evaluations are, by nature, highly subjective. They involve expectations about future cash flows generated by our assets and reflect management’s assumptions and judgments regarding future industry conditions and their effect on future utilization levels, dayrates, and costs. The use of different estimates and assumptions could result in materially different carrying values of our assets.

As of December 31, 2015, with continuing declines to commodity prices and an outlook that commodity prices may be lower for longer, we lowered our expectations about future utilization of our drilling rigs and associated cash flows.  We performed a Step 1 analysis as required by ASC 360-10-35 to assess the recoverability of long-lived assets within our contract drilling segment.  With respect to these assets, future cash flows were estimated over the expected remaining life of the assets. Management determined that, on an undiscounted basis, expected cash flows exceeded the carrying value of the long-lived assets within our contract drilling segment by 99%, and there was no impairment at December 31, 2015.

On a periodic basis, we evaluate our fleet of drilling rigs for marketability based on the condition of inactive rigs, expenditures that would be necessary to bring them to working condition and the expected demand for drilling services by rig type. The components comprising inactive rigs are evaluated, and those components with continuing utility to the Company’s other marketed rigs are transferred to other rigs or to its yards to be used as spare equipment. The remaining components of these rigs are retired. In December 2014, we removed from service 31 drilling rigs, some older top drives, and certain drill pipe no longer marketable in the current environment and based on the estimated market value from third-party assessments, we recorded a write-down of approximately $74.3 million, pre-tax. During the first quarter of 2015, we sold one of these drilling rigs to an unaffiliated third party. The proceeds of this sale, less costs to sell, exceeded the $0.3 million net book value of the drilling rig resulting in a gain of $7,900. During the second quarter, we recorded an additional write-down on the remaining drilling rigs and other equipment of approximately $8.3 million pre-tax based on the estimated market value from similar auctions. During the third quarter, we sold the remaining 30 drilling rigs and most of the equipment in an auction. The proceeds from the sale of those assets, less costs to sell, was less than the $11.0 million net book value resulting in a loss of $7.3 million pre-tax. Some of the equipment that was not sold at the auction will be sold within the next twelve months and remain classified as assets held for sale. The net book value of those assets is $0.6 million. When property and equipment components are disposed of, the cost and the related accumulated depreciation are removed from the accounts and any resulting gain or loss is generally reflected in operations. For dispositions of drill pipe and drill collars, an average cost for the appropriate feet of drill pipe and drill collars is removed from the asset account and charged to accumulated depreciation and proceeds, if any, are credited to accumulated depreciation.

In 2015, our mid-stream segment incurred a $27.0 million, pre-tax write-down of three of its systems, Bruceton Mills, Midwell, and Spring Creek due to anticipated future cash flow and future development around these systems not being sufficient to support their carrying value. The estimated future cash flows were less than the carrying value on these systems.

In 2014, our mid-stream segment incurred a $7.1 million, pre-tax write-down of three of its systems, Weatherford, Billy Rose, and Spring Creek due to anticipated future cash flow and future development around these systems not being sufficient to support their carrying value. The estimated future cash flows were less than the carrying value on these systems. No significant impairments were recorded in 2013.

We record an asset and a liability equal to the present value of the expected future ARO associated with our oil and gas properties. The ARO asset is depreciated in a manner consistent with the depreciation of the underlying physical asset. We measure changes in the liability due to passage of time by accreting an interest charge. This amount is recognized as an increase in the carrying amount of the liability and as a corresponding accretion expense.

Capitalized Interest

During 2015, 2014, and 2013, interest of approximately $21.7 million, $32.2 million, and $33.7 million, respectively, was capitalized based on the net book value associated with unproved properties not being amortized, the construction of additional drilling rigs, and the construction of gas gathering systems. Interest is being capitalized using a weighted average interest rate based on our outstanding borrowings.

Goodwill

Goodwill represents the excess of the cost of acquisitions over the fair value of the net assets acquired. Goodwill is not amortized, but an impairment test is performed at least annually to determine whether the fair value has decreased and is performed additionally when events indicate an impairment may have occurred. For purposes of impairment testing, goodwill is evaluated at the reporting unit level. Our goodwill is all related to our contract drilling segment, and accordingly, the impairment test is generally based on the estimated discounted future net cash flows of our drilling segment, utilizing discount rates and other factors in determining the fair value of our drilling segment. Inputs in our estimated discounted future net cash flows include drilling rig utilization, day rates, gross margin percentages, and terminal value.No goodwill impairment was recorded for the years ended December 31, 2015, 2014, or 2013. There were no additions to goodwill in 2015, 2014, or 2013. Based on our impairment test performed as of December 31, 2015, the fair value of our drilling segment exceeded its carrying value by 19%. Goodwill of $2.2 million is deductible for tax purposes.

Intangible Assets

Intangible assets are capitalized and amortized over the estimated period benefited. Such amounts are reviewed for possible impairment whenever events or changes in circumstances indicate that the carrying amount may not be recoverable. No intangible asset impairment was recorded for the years ended December 31, 2015, 2014, or 2013. Amortization of $0.7 million was recorded 2013. Accumulated amortization for 2013 was $18.0 million. Our intangible assets became fully amortized in 2013, so no amortization was recorded in 2014 or 2015.

Oil and Natural Gas Operations

We account for our oil and natural gas exploration and development activities using the full cost method of accounting prescribed by the SEC. Accordingly, all productive and non-productive costs incurred in connection with the acquisition, exploration and development of our oil, NGLs, and natural gas reserves, including directly related overhead costs and related asset retirement costs, are capitalized and amortized on a units-of-production method based on proved oil and natural gas reserves. Directly related overhead costs of $19.2 million, $23.7 million, and $21.5 million were capitalized in 2015, 2014, and 2013, respectively. Independent petroleum engineers annually audit our internal evaluation of our reserves. The average rates used for depreciation, depletion, and amortization (DD&A) were $12.30, $14.82, and $13.32 per Boe in 2015, 2014, and 2013, respectively. The calculation of DD&A includes estimated future expenditures to be incurred in developing proved reserves and estimated dismantlement and abandonment costs, net of estimated salvage values. Our unproved properties totaling $337.1 million are excluded from the DD&A calculation.

No gains or losses are recognized on the sale, conveyance, or other disposition of oil and natural gas properties unless a significant reserve amount to our total reserves is involved.

Revenue from the sale of oil and natural gas is recognized when title passes, net of royalties.

Under the full cost rules, at the end of each quarter, we review the carrying value of our oil and natural gas properties. The full cost ceiling is based principally on the estimated future discounted net cash flows from our oil and natural gas properties discounted at 10%. We use the unweighted arithmetic average of the commodity prices existing on the first day of each of the 12 months before the end of the reporting period to calculate discounted future revenues, unless prices were otherwise determined under contractual arrangements. In the event the unamortized cost of oil and natural gas properties being amortized exceeds the full cost ceiling, as defined by the SEC, the excess is charged to expense in the period during which such excess occurs. Once incurred, a write-down of oil and natural gas properties is not reversible.

We determined the value of certain unproved oil and gas properties were diminished (in part or in whole) based on an impairment evaluation and our anticipated future exploration plans. Those determinations resulted in $73.7 million (in 2014) and $114.4 million (in 2015) of costs being added to the total of our capitalized costs being amortized. We incurred a

$76.7 million pre-tax ($47.7 million net of tax) non-cash ceiling test write-down of our oil and natural gas properties in 2014. In 2015, we incurred non-cash ceiling test write-downs of our oil and natural gas properties of $1.6 billion pre-tax ($1.0 billion net of tax) in 2015 due to the inclusion of the impaired value of those unproved properties and a reduction of the 12-month average commodity prices during the year.

Our contract drilling segment provides drilling services for our exploration and production segment. Depending on their timing some of the drilling services performed on our properties are also deemed to be associated with the acquisition of an ownership interest in the property. Revenues and expenses for such services are eliminated in our statement of operations, with any profit recognized as a reduction in our investment in our oil and natural gas properties. The contracts for these services are issued under the same conditions and rates as the contracts entered into with unrelated third parties. We eliminated revenue of $22.1 million, $89.5 million, and $64.3 million for 2015, 2014, and 2013, respectively from our contract drilling segment and eliminated the associated operating expense of $18.3 million, $62.4 million, and $46.9 million during 2015, 2014, and 2013, respectively, yielding $3.8 million, $27.1 million, and $17.4 million during 2015, 2014, and 2013, respectively, as a reduction to the carrying value of our oil and natural gas properties.

Gas Gathering and Processing Revenue

Our gathering and processing segment recognizes revenue from the gathering and processing of natural gas and NGLs in the period the service is provided based on contractual terms.

Insurance

We are self-insured for certain losses relating to workers’ compensation, control of well and employee medical benefits. Insured policies for other coverage contain deductibles or retentions per occurrence that range from zero to $1.0 million. We have purchased stop-loss coverage in order to limit, to the extent feasible, per occurrence and aggregate exposure to certain types of claims. However, there is no assurance that the insurance coverages we have will adequately protect us against liability from all potential consequences. Unit Texas Drilling, L.L.C. was merged into its parent company, Unit Drilling Company, effective October 31, 2015, at which time the ERISA governed occupational injury benefit program was closed. All new claims after this date are processed under an existing insured workers’ compensation program. If insurance coverage becomes more expensive, we may choose to self-insure, decrease our limits, raise our deductibles, or any combination of these rather than pay higher premiums.

Derivative Activities

All derivatives are recognized on the balance sheet and measured at fair value. For our economic hedges that we did not apply cash flow accounting to, any changes in their fair value occurring before their maturity (i.e., temporary fluctuations in value) are reported in gain (loss) on derivatives not designated as hedges and hedge ineffectiveness, net in our Consolidated Statements of Operations. The commodity derivative instruments we had under cash flow accounting expired as of December 2013. Previous changes in the fair value of derivatives designated as cash flow hedges, to the extent they were effective in offsetting cash flows attributable to the hedged risk, were recorded in OCI until the hedged item was recognized into earnings. When the hedged item was recognized into earnings, it was reported in oil and natural gas revenues. Any change in fair value resulting from ineffectiveness was recognized in gain (loss) on derivatives not designated as hedges and hedge ineffectiveness, net. In August 2012, we determined on a prospective basis, to enter into economic hedges without electing cash flow hedge accounting.

We do not engage in derivative transactions for speculative purposes. We document our risk management strategy, and for the cash flow hedges, we tested the hedge effectiveness at the inception of and during the term of each hedge.

Limited Partnerships

Unit Petroleum Company is a general partner in 15 oil and natural gas limited partnerships sold privately and publicly. Some of our officers, directors, and employees own the interests in most of these partnerships. We share in each partnership’s revenues and costs in accordance with formulas set out in each of the limited partnership agreement. The partnerships also reimburse us for certain administrative costs incurred on behalf of the partnerships.

Income Taxes

Measurement of current and deferred income tax liabilities and assets is based on provisions of enacted tax law; the effects of future changes in tax laws or rates are not included in the measurement. Valuation allowances are established where necessary to reduce deferred tax assets to the amount expected to be realized. Income tax expense is the tax payable for the year and the change during that year in deferred tax assets and liabilities.

The accounting for uncertainty in income taxes prescribes a recognition threshold and measurement attribute for the financial statement recognition and measurement of a tax position taken or expected to be taken in a return. Guidance is also provided on de-recognition, classification, interest and penalties, accounting in interim periods, disclosure, and transition. We have $0.4 million of unrecognized tax benefits.

Natural Gas Balancing

We use the sales method for recording natural gas sales. This method allows for recognition of revenue, which may be more or less than its share of pro-rata production from certain wells. We estimate our December 31, 2015 balancing position to be approximately 4.7 Bcf on under-produced properties and approximately 4.8 Bcf on over-produced properties. We have recorded a receivable of $2.5 million on certain wells where we estimate that insufficient reserves are available for us to recover the under-production from future production volumes. We have also recorded a liability of $5.0 million on certain properties where we believe there are insufficient reserves available to allow the under-produced owners to recover their under-production from future production volumes. Our policy is to expense the pro-rata share of lease operating costs from all wells as incurred. Such expenses relating to the balancing position on wells in which we have imbalances are not material.

Employee And Director Stock Based Compensation

We recognize in our financial statements the cost of employee services received in exchange for awards of equity instruments based on the grant date fair value of those awards. The amount of our equity compensation cost relating to employees directly involved in exploration activities of our oil and natural gas segment is capitalized to our oil and natural gas properties. Amounts not capitalized to our oil and natural gas properties are recognized in general and administrative expense and operating costs of our business segments. We utilize the Black-Scholes option pricing model to measure the fair value of stock options and stock appreciation rights (SARs). The value of our restricted stock grants is based on the closing stock price on the date of the grants.

Impact of Financial Accounting Pronouncements

Income Taxes: Balance Sheet Classification of Deferred Taxes. The FASB has issued ASU 2015-17. This changes how deferred taxes are classified on organizations' balance sheets. Organizations will be required to classify all deferred tax assets and liabilities as noncurrent. The amendments apply to all organizations that present a classified balance sheet. For public companies, the amendments are effective for financial statements issued for annual periods beginning after December 15, 2016, and interim periods within those annual periods. Early adoption of the amendments is permitted. We are in the process of evaluating the impact it will have on our financial statements.

Interest—Imputation of Interest: Simplifying the Presentation of Debt Issuance Costs. The FASB has issued ASU 2015-03. The amendments in this ASU require that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. The FASB has also issued ASU 2015-15. The amendments in this ASU allow an entity to defer and present debt issuance cost as an asset and subsequently amortize the deferred debt issuance costs ratably over the term of the line-of-credit arrangement, regardless of whether there are any outstanding borrowings on the line-of-credit arrangement. For public business entities, the amendments are effective for financial statements issued for fiscal years beginning after December 15, 2015, and interim periods within those fiscal years. Early adoption of the amendments is permitted for financial statements that have not been previously issued. The amendments should be applied on a retrospective basis, wherein the balance sheet of each individual period presented should be adjusted to reflect the period-specific effects of applying the new guidance. We do not expect the adoption of this guidance will have a material impact on our financial statements.

Revenue from Contracts with Customers. The FASB has issued ASU 2014-09. This affects any entity using U.S. GAAP that either enters into contracts with customers to transfer goods or services or enters into contracts for the transfer of nonfinancial assets unless those contracts are within the scope of other standards (e.g., insurance contracts or lease contracts). The core principle of the guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The FASB has issued 2015-14, which defers the effective date to annual reporting periods beginning after December 15, 2017, including interim reporting periods within that reporting period. We are in the process of evaluating the impact it will have on our financial statements.

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Summary Of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2015

Accounting Policies [Abstract]

Schedule of Segment's Revenue [Table Text Block]

Below are the third-party customers that accounted for more than 10% of our segment’s revenues:

	2015		2014		2013
Oil and Natural Gas:
Sunoco Logistics Partners L.P.	19	%	14	%	8	%
Valero Energy Corporation	15	%	24	%	25	%
Drilling:
QEP Resources, Inc.	25	%	19	%	18	%
Whiting Petroleum Corp. (formerly Kodiak Oil and Gas Corp.)	7	%	9	%	10	%
Mid-Stream:
ONEOK Partners, L.P.	29	%	44	%	57	%
Tenaska Resources, LLC	18	%	22	%	16	%
Laclede Group, Inc.	12	%	16	%	7	%

Schedule Of Fair Values Of The Net Assets [Table Text Block]

At December 31, 2015, the fair values of the net assets we had with each of the counterparties with respect to all of our commodity derivative transactions are listed in the table below:

	December 31, 2015
	(In millions)
Canadian Imperial Bank of Commerce	$	8.7
Bank of Montreal	1.1
Scotiabank	0.7
Bank of America Merrill Lynch	0.4
Total assets	$	10.9

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Earnings (Loss) Per Share Earnings (Loss) Per Share (Tables)

12 Months Ended

Dec. 31, 2015

Earnings Per Share [Abstract]

Schedule of Earnings (Loss) Per Share [Table Text Block]

The following data shows the amounts used in computing earnings (loss) per share:

	Income (Loss) (Numerator)			Weighted Shares (Denominator)	Per-Share Amount
	(In thousands except per share amounts)
For the year ended December 31, 2013:
Basic earnings per common share	$	184,746		48,218	$	3.83
Effect of dilutive stock options, restricted stock, and SARs	—			354	(0.03		)
Diluted earnings per common share	$	184,746		48,572	$	3.80
For the year ended December 31, 2014:
Basic earnings per common share	$	136,276		48,611	$	2.80
Effect of dilutive stock options, restricted stock, and SARs	—			472	(0.02		)
Diluted earnings per common share	$	136,276		49,083	$	2.78
For the year ended December 31, 2015:
Basic earnings (loss) per common share	$	(1,037,361	)	49,110	$	(21.12	)
Effect of dilutive stock options, restricted stock, and SARs	—			—	—
Diluted earnings (loss) per common share	$	(1,037,361	)	49,110	$	(21.12	)

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]

The following options and their average exercise prices were not included in the computation of diluted earnings per share because the option exercise prices were greater than the average market price of our common stock for the years ended December 31:

	2015		2014		2013
Options and SARs	261,270		73,500		149,665
Average exercise price	$	50.34	$	64.43	$	58.41

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Accrued Liabilities (Tables)

12 Months Ended

Dec. 31, 2015

Accrued Liabilities [Abstract]

Accrued Liabilities [Table Text Block]

Accrued liabilities consisted of the following as of December 31:

	2015		2014
	(In thousands)
Lease operating expenses	$	17,220	$	20,709
Employee costs	12,641		31,451
Interest payable	6,321		6,654
Taxes	3,767		3,284
Third-party credits	3,326		2,825
Other	3,643		5,248
Total accrued liabilities	$	46,918	$	70,171

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Long-Term Debt And Other Long-Term Liabilities (Tables)

12 Months Ended

Dec. 31, 2015

Long-term debt and other long-term liabilites [Abstract]

Long Term Debt [Table Text Block]

Long-term debt consisted of the following as of December 31:

	2015		2014
	(In thousands)
Credit agreement with an average interest rates of 2.6% and 2.9% at December 31, 2015 and 2014, respectively	$	281,000	$	166,000
6.625% senior subordinated notes due 2021, net of unamortized discount of $3.3 million and $3.8 million at December 31, 2015 and 2014, respectively	646,662		646,163
Total long-term debt	$	927,662	$	812,163

Other Long Term Liabilities [Table Text Block]

Other long-term liabilities consisted of the following as of December 31:

	2015		2014
	(In thousands)
ARO liability	$	98,297	$	100,567
Capital lease obligations	22,466		25,876
Workers’ compensation	16,551		17,997
Separation benefit plans	9,886		11,276
Gas balancing liability	5,047		3,623
Deferred compensation plan	4,244		4,055
Other	410		410
	156,901		163,804
Less current portion	16,560		15,019
Total other long-term liabilities	$	140,341	$	148,785

Schedule of Future Minimum Lease Payments for Capital Leases [Table Text Block]

Future payments required under the capital leases at December 31, 2015 are as follows:

	Amount
Ending December 31,	(In thousands)
2016	$	6,168
2017	6,168
2018	6,168
2019	6,168
2020	6,168
2021	3,769
Total future payments	34,609
Less payments related to:
Maintenance	9,445
Interest	2,698
Present value of future minimum payments	$	22,466

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Asset Retirement Obligations (Tables)

12 Months Ended

Dec. 31, 2015

Asset Retirement Obligation Disclosure [Abstract]

Schedule Of Asset Retirement Obligations [Table Text Block]

The following table shows certain information about our AROs for the periods indicated:

	2015			2014
	(In thousands)
ARO liability, January 1:	$	100,567		$	133,657
Accretion of discount	3,453			4,599
Liability incurred	6,754			6,246
Liability settled	(2,893		)	(4,490		)
Liability sold	(421		)	(1,206		)
Revision of estimates (1)	(9,163		)	(38,239		)
ARO liability, December 31:	98,297			100,567
Less current portion	3,965			3,204
Total long-term ARO liability	$	94,332		$	97,363

_________________________

(1) Plugging liability estimates were revised in both 2015 and 2014 for updates in the cost of services used to plug wells over the preceding year. We had various upward and downward adjustments as well as changes in estimated timing of cash flows.

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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2015

Income Tax Disclosure [Abstract]

Reconciliation Of Income Tax Expense (Benefit) [Table Text Block]

A reconciliation of income tax expense (benefit), computed by applying the federal statutory rate to pre-tax income (loss) to our effective income tax expense (benefit) is as follows:

	2015			2014		2013
	(In thousands)
Income tax expense (benefit) computed by applying the statutory rate	$	(582,508	)	$	78,029	$	105,514
State income tax, net of federal benefit	(45,768		)	6,131		8,290
Statutory depletion and other	1,328			2,503		2,919
Income tax expense (benefit)	$	(626,948	)	$	86,663	$	116,723

Schedule Of Total Provision For Income Taxes [Table Text Block]

For the periods indicated, the total provision for income taxes consisted of the following:

	2015			2014		2013
	(In thousands)
Current taxes:
Federal	$	(20,612	)	$	8,594	$	15,845
State	(4		)	784		146
	(20,616		)	9,378		15,991
Deferred taxes:
Federal	(535,691		)	68,360		87,839
State	(70,641		)	8,925		12,893
	(606,332		)	77,285		100,732
Total provision	$	(626,948	)	$	86,663	$	116,723

Schedule Of Deferred Tax Assets And Liabilities [Table Text Block]

Deferred tax assets and liabilities are comprised of the following at December 31:

	2015			2014
	(In thousands)
Deferred tax assets:
Allowance for losses and nondeductible accruals	$	56,479		$	55,231
Net operating loss carryforward	140,863			54,901
Alternative minimum tax and research and development tax credit carryforward	5,409			25,991
	202,751			136,123
Deferred tax liability:
Depreciation, depletion, amortization, and impairment	(464,295		)	(1,000,811		)
Net deferred tax liability	(261,544		)	(864,688		)
Current deferred tax asset	14,206			11,527
Non-current—deferred tax liability	$	(275,750	)	$	(876,215	)

Schedule of Unrecognized Tax Benefits [Table Text Block]

A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows:

	2015		2014		2013
	(In thousands)
Balance at January 1:	$	410	$	—	$	—
Additions based on tax positions related to current year	—		410		—
Additions for tax positions of prior years	—		—		—
Reductions for tax positions of prior years	—		—		—
Settlements	—		—		—
Balance at December 31:	$	410	$	410	$	—

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Transactions With Related Parties (Tables)

12 Months Ended

Dec. 31, 2015

Related Party Transactions [Abstract]

Schedule Of Amount Received In Public And Private Partnerships [Table Text Block]

Amounts received in the years ended December 31, from both public and private Partnerships for which Unit is a general partner are as follows:

	2015		2014		2013
	(In thousands)
Contract drilling	$	—	$	4	$	16
Well supervision and other fees	423		435		470
General and administrative expense reimbursement	18		39		36

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Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule Of Restricted Stock Awards Stock Options And SAR [Table Text Block]

For restricted stock awards, we had:

	2015 (1)		2014		2013
	(In millions)
Recognized stock compensation expense	$	15.3	$	17.4	$	16.1
Capitalized stock compensation cost for our oil and natural gas properties	3.5		3.7		3.5
Tax benefit on stock based compensation	5.8		6.7		6.2

_________________________

(1) Recognized stock compensation was reduced by $3.2 million, capitalized stock compensation cost for our oil and natural gas properties was reduced by $0.2 million, and the tax benefit was reduced by $1.2 million for lower expected payouts related to the performance shares.

Activity Pertaining to Stock Appreciation Rights [Table Text Block]

Activity pertaining to SARs granted under the amended plan is as follows:

	Number of Shares		Weighted Average Price
Outstanding at January 1, 2013	145,901		$	46.59
Granted	—		—
Exercised	—		—
Forfeited	—		—
Outstanding at December 31, 2013	145,901		46.59
Granted	—		—
Exercised	(14,131	)	46.50
Forfeited	—		—
Outstanding at December 31, 2014	131,770		46.60
Granted	—		—
Exercised	—		—
Forfeited	—		—
Outstanding at December 31, 2015	131,770		$	46.60

Shares Authorized Under Stock Appreciation Rights By Exercise Price [Table Text Block]

	Outstanding and Exercisable SARs at December 31, 2015
Exercise Prices	Number  of Shares	Weighted Average Remaining Contractual Life	Weighted Average Exercise Price
$44.31	91,255	2.0 years	$44.31
$51.76	40,515	0.9 years	$51.76

Activity Pertaining To Restricted Stock Awards [Table Text Block]

Activity pertaining to restricted stock awards granted under the amended plan is as follows:

Employees	Number of Time Vested Shares		Number of Performance Vested Shares		Total Number of Shares		Weighted Average Price
Nonvested at January 1, 2013	523,024		66,503		589,527		$	48.11
Granted	396,144		57,405		453,549		48.20
Vested	(248,003	)	—		(248,003	)	46.46
Forfeited	(18,330	)	—		(18,330	)	47.85
Nonvested at December 31, 2013	652,835		123,908		776,743		48.70
Granted	383,448		71,674		455,122		53.72
Vested	(291,712	)	(13,092	)	(304,804	)	49.68
Forfeited	(19,805	)	(6,970	)	(26,775	)	51.92
Nonvested at December 31, 2014	724,766		175,520		900,286		50.81
Granted	576,361		148,081		724,442		34.06
Vested	(343,657	)	(39,245	)	(382,902	)	49.69
Forfeited	(20,808	)	(7,196	)	(28,004	)	45.33
Nonvested at December 31, 2015	936,662		277,160		1,213,822		$	41.29

Non-Employee Directors	Number of Shares		Weighted Average Price
Nonvested at January 1, 2013	24,606		$	40.23
Granted	21,128		41.65
Vested	(10,030	)	40.23
Forfeited	—		—
Nonvested at December 31, 2013	35,704		$	41.07
Granted	13,768		63.91
Vested	(14,336	)	40.93
Forfeited	—		—
Nonvested at December 31, 2014	35,136		$	50.08
Granted	25,848		34.04
Vested	(18,920	)	46.51
Forfeited	—		—
Nonvested at December 31, 2015	42,064		$	41.83

Activity Pertaining to the Stock Option Plan [Table Text Block]

Activity pertaining to the Stock Option Plan is as follows:

	Number of Shares		Weighted Average Exercise Price
Outstanding at January 1, 2013	118,030		$	33.03
Granted	—		—
Exercised	(48,110	)	26.09
Forfeited	(1,000	)	37.83
Outstanding at December 31, 2013	68,920		37.81
Granted	—		—
Exercised	(21,490	)	37.83
Forfeited	(37,930	)	37.83
Outstanding at December 31, 2014	9,500		37.69
Granted	—		—
Exercised	—		—
Forfeited	(9,500	)	37.69
Outstanding at December 31, 2015	—		$	—

Activity Pertaining to Nonemployee Director Stock Award Plan [Table Text Block]

Activity pertaining to the Directors’ Plan is as follows:

	Number of Shares		Weighted Average Exercise Price
Outstanding at January 1, 2013	192,500		$	49.39
Granted	—		—
Exercised	(17,500	)	32.53
Forfeited	(3,500	)	20.46
Outstanding at December 31, 2013	171,500		51.70
Granted	—		—
Exercised	(21,000	)	33.94
Forfeited	—		—
Outstanding at December 31, 2014	150,500		54.18
Granted	—		—
Exercised	—		—
Forfeited	(21,000	)	54.35
Outstanding at December 31, 2015	129,500		$	54.15

Shares Authorized Under Nonemployee Director Option Plans By Exercise Price Range [Table Text Block]

	Outstanding and Exercisable Options at December 31, 2015
Weighted Average Exercise Price	Number  of Shares	Weighted Average Remaining Contractual Life	Weighted Average Exercise Price
$31.30 - $41.21	38,500	3.9 years	$	37.58
$53.81 - $73.26	91,000	2.6 years	$	61.16

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Derivatives (Tables)

12 Months Ended

Dec. 31, 2015

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Non-designated Hedges Outstanding [Table Text Block]

At December 31, 2015, the following non-designated hedges were outstanding:

Term	Commodity	Contracted Volume	Weighted Average  Fixed Price for Swaps	Contracted Market
Jan’16 – Dec’16	Natural gas – swap	35,000 MMBtu/day	$2.625	IF – NYMEX (HH)
Jan’16 – Dec'16	Natural gas – collar	42,000 MMBtu/day	$2.40 - $2.88	IF – NYMEX (HH)
Jan’16 – Dec'16	Natural gas – three-way collar	13,500 MMBtu/day	$2.70 - $2.20 - $3.26	IF – NYMEX (HH)
Jan’17 – Dec'17	Natural gas – three-way collar	15,000 MMBtu/day	$2.50 - $2.00 - $3.32	IF – NYMEX (HH)
Jan’16 – Jun'16	Crude oil – collar	2,150 Bbl/day	$46.36 - $55.62	WTI – NYMEX
Jul’16 – Dec'16	Crude oil – collar	1,450 Bbl/day	$47.50 - $56.40	WTI – NYMEX
Jan’16 – Dec'16	Crude oil – three-way collar	700 Bbl/day	$46.50 - $35.00 - $57.00	WTI – NYMEX
Jul’16 – Dec'16	Crude oil – three-way collar (1)	700 Bbl/day	$47.50 - $35.00 - $63.50	WTI – NYMEX
Jan’17 – Dec'17	Crude oil – three-way collar	750 Bbl/day	$50.00 - $37.50 - $63.90	WTI – NYMEX

Schedule Of Subsequent Non-designated Hedges [Table Text Block]

Subsequent to December 31, 2015, the following non-designated hedges were entered into:

Term	Commodity	Contracted Volume	Weighted Average  Fixed Price for Swaps	Contracted Market
Feb’16 – Dec'16	Natural gas – swap	10,000 MMBtu/day	$2.495	IF – NYMEX (HH)
Jan’17 – Dec'17	Natural gas – swap	10,000 MMBtu/day	$2.795	IF – NYMEX (HH)

Fair Value Of Derivative Instruments And Locations In Balance Sheets [Table Text Block]

The following tables present the fair values and locations of the derivative transactions recorded in our Consolidated Balance Sheets at December 31:

		Derivative Assets Fair Value
	Balance Sheet Location	2015		2014
		(In thousands)
Commodity derivatives:
Current	Current derivative assets	$	10,186	$	31,139
Long-term	Non-current derivative assets	968		—
Total derivative assets		$	11,154	$	31,139

		Derivative Liabilities Fair Value
	Balance Sheet Location	2015		2014
		(In thousands)
Commodity derivatives:
Current	Current derivative liabilities	$	—	$	—
Long-term	Non-current derivative liabilities	285		—
Total derivative liabilities		$	285	$	—

Effect Of Derivative Instruments Recognized In Statement Of Operations, Not Designated As Hedging Instruments [Table Text Block]

Effect of Derivative Instruments on the Consolidated Statements of Operations (derivatives not designated as hedging instruments) for the year ended December 31:

Derivatives Not Designated as Hedging Instruments	Location of Gain or (Loss) Recognized in Income on Derivative	Amount of Gain or (Loss) Recognized in Income on  Derivative
		2015		2014
		(In thousands)
Commodity derivatives	Gain on derivatives not designated as hedges and hedge ineffectiveness, net (1)	$	26,345	$	30,147
Total		$	26,345	$	30,147

_________________________

(1) Amount settled during the period is a gain of $46,615 and a loss of $6,038, respectively.

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Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2015

Fair Value Disclosures [Abstract]

Recurring Fair Value Measurements [Table Text Block]

The following tables set forth our recurring fair value measurements:

	December 31, 2015
	Level 2			Level 3			Effect of Netting			Total
	(In thousands)
Financial assets (liabilities):
Commodity derivatives:
Assets	$	2,794		$	10,145		$	(1,785	)	$	11,154
Liabilities	(1,019		)	(1,051		)	1,785			(285		)
	$	1,775		$	9,094		$	—		$	10,869

	December 31, 2014
	Level 2		Level 3		Effect of Netting		Total
	(In thousands)
Financial assets (liabilities):
Commodity derivatives:
Assets	$	27,784	$	3,355	$	—	$	31,139
Liabilities	—		—		—		—
	$	27,784	$	3,355	$	—	$	31,139

Reconciliations Of Level 3 Fair Value Measurements [Table Text Block]

The following tables are reconciliations of our level 3 fair value measurements:

	Net Derivatives
	For the Year Ended,
	December 31, 2015			December 31, 2014
	(In thousands)
Beginning of period	$	3,355		$	(2,595	)
Total gains or losses:
Included in earnings (1)	15,260			6,108
Settlements	(9,521		)	(158		)
End of period	$	9,094		$	3,355
Total gains for the period included in earnings attributable to the change in unrealized loss relating to assets still held at end of period	$	5,739		$	5,950

_________________________

(1) Commodity derivatives are reported in the Consolidated Statements of Operations in gain (loss) on derivatives not designated as hedges and hedge ineffectiveness, net.

Schedule Of Quantitative Information About Unobservable Inputs [Table Text Block]

The following table provides quantitative information about our Level 3 unobservable inputs at December 31, 2015:

Commodity (1)	Fair Value		Valuation Technique	Unobservable Input	Range
	(In thousands)
Oil collars	$	3,893	Discounted cash flow	Forward commodity price curve	$0.40 - $55.05
Oil three-way collar	3,470		Discounted cash flow	Forward commodity price curve	$0.40 - $71.66
Natural gas collar	1,000		Discounted cash flow	Forward commodity price curve	$0.40 - $1.26
Natural gas three-way collar	731		Discounted cash flow	Forward commodity price curve	$0.40 - $1.93

 _________________________

(1) The commodity contracts detailed in this category include non-exchange-traded crude oil and natural gas collars and three-way collars that are valued based on NYMEX. The forward pricing range represents the low and high price expected to be received within the settlement period.

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Accumulated Other Comprehensive Income (Tables)

12 Months Ended

Dec. 31, 2015

Equity [Abstract]

Changes in accumulated other comprehensive income [Table Text Block]

Changes in accumulated other comprehensive income (loss) by component, net of tax, are as follows:

	Net Gains (Losses) on Cash Flow Hedges
	2015		2014		2013
	(In thousands)
Balance at January 1:	$	—	$	—	$	7,587
Other comprehensive income before reclassification	—		—		(7,349		)
Amounts reclassified from accumulated other comprehensive income	—		—		(238		)
New current-period other comprehensive income	—		—		(7,587		)
Balance at December 31:	$	—	$	—	$	—

Schedule of accumulated other comprehensive income [Table Text Block]

Amounts reclassified from accumulated other comprehensive income (loss) into the Consolidated Statements of Operations for the year ended December 31:

	2015		2014		2013			Affected Line Item in the Statement Where Net Income is Presented
	(In thousands)
Net gains (loss) on cash flow hedges
Commodity derivatives	$	—	$	—	$	603		Oil and natural gas revenues
Commodity derivatives	—		—		(190		)	Gain (loss) on derivatives not designated as hedges and hedge ineffectiveness, net
	—		—		413			Total before tax
	—		—		(175		)	Tax expense
Total reclassification for the period	$	—	$	—	$	238		Net of tax

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Industry Segment Information (Tables)

12 Months Ended

Dec. 31, 2015

Segment Reporting [Abstract]

Revenue From Different Segments [Table Text Block]

The following table provides certain information about the operations of each of our segments:

	2015				2014				2013
	(In thousands)
Revenues:
Oil and natural gas	$	385,774			$	740,079			$	649,718
Contract drilling	287,767				566,012				479,091
Elimination of inter-segment revenue	(22,099		)		(89,495		)		(64,313		)
Contract drilling net of inter-segment revenue	265,668				476,517				414,778
Gas gathering and processing	268,012				445,934				378,397
Elimination of inter-segment revenue	(65,223		)		(89,586		)		(91,043		)
Gas gathering and processing net of inter-segment revenue	202,789				356,348				287,354
Total revenues	$	854,231			$	1,572,944			$	1,351,850
Operating income (loss):
Oil and natural gas	$	(1,631,564	)	(4)	$	199,392		(4)	$	239,219
Contract drilling	44,811			(5)	41,896			(5)	96,304
Gas gathering and processing	(29,409		)	(6)	2,015			(6)	10,757
Total operating income (loss) (1)	(1,616,162		)		243,303				346,280
General and administrative	(35,345		)		(42,023		)		(38,323		)
Gain (loss) on disposition of assets	(7,229		)		8,953				17,076
Interest expense, net	(31,963		)		(17,371		)		(15,015		)
Gain (loss) on derivatives not designated as hedges and hedge ineffectiveness, net	26,345				30,147				(8,374		)
Other	45				(70		)		(175		)
Income (loss) before income taxes	$	(1,664,309	)		$	222,939			$	301,469
Identifiable assets:
Oil and natural gas	$	1,218,036			$	2,856,833			$	2,441,792
Contract drilling	993,015				1,059,980				1,042,661
Gas gathering and processing	478,661				500,255				473,717
Total identifiable assets (2)	2,689,712				4,417,068				3,958,170
Corporate assets	118,797				56,660				64,220
Total assets	$	2,808,509			$	4,473,728			$	4,022,390
Capital expenditures:
Oil and natural gas	$	267,944			$	740,262			$	531,233
Contract drilling	84,802				176,683				64,325
Gas gathering and processing	63,476				79,268			(3)	96,085
Other	38,065				17,067				4,483
Total capital expenditures	$	454,287			$	1,013,280			$	696,126
Depreciation, depletion, amortization, and impairment:
Oil and natural gas:
Depreciation, depletion, and amortization	$	251,944			$	276,088			$	226,498
Impairment of oil and natural gas properties	1,599,348			(4)	76,683			(4)	—
Contract drilling:
Depreciation	56,135				85,370				71,194
Impairment of contract drilling equipment	8,314			(5)	74,318			(5)	—
Gas gathering and processing:
Depreciation and amortization	43,676				40,434				33,191
Impairment of gas gathering and processing systems	26,966			(6)	7,068			(6)	—
Other	3,075				3,051				3,024
Total depreciation, depletion, amortization, and impairment	$	1,989,458			$	563,012			$	333,907

_______________________ 

(1) Operating income (loss) is total operating revenues less operating expenses, depreciation, depletion, amortization, and impairment and does not include general corporate expenses, gain (loss) on disposition of assets, gain (loss) on non-designated hedges and hedge ineffectiveness, net, interest expense, other income (loss), or income taxes.

(2) Identifiable assets are those used in Unit’s operations in each industry segment. Corporate assets are principally cash and cash equivalents, short-term investments, corporate leasehold improvements, furniture, and equipment.

(3) In 2014, we entered into capital leases for $28.2 million.

(4) In 2015 and 2014, we incurred non-cash ceiling test write-downs of our oil and natural gas properties of $1.6 billion and $76.7 million pre-tax ($1.0 billion and $47.7 million, net of tax), respectively.

(5) Impairment for contract drilling equipment for 2015 includes a $8.3 million pre-tax write-down and 2014 includes a $74.3 million pre-tax write-down for 31 drilling rigs, some older top drives, and certain drill pipe removed from service.

(6) Impairment for gas gathering and processing systems for 2015 includes a $27.0 million pre-tax write-down for three of our systems, Bruceton Mills, Midwell, and Spring Creek. For 2014, it includes a $7.1 million pre-tax write-down for three of our systems, Weatherford, Billy Rose, and Spring Creek.

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Selected Quarterly Financial Information (Tables)

12 Months Ended

Dec. 31, 2015

Selected Quarterly Financial Information [Abstract]

Schedule Of Quarterly Financial Information [Table Text Block]

Summarized unaudited quarterly financial information is as follows:

	Three Months Ended
	March 31			June 30			September 30			December 31
	(In thousands except per share amounts)
2014
Revenues	$	387,988		$	405,431		$	400,974		$	378,551
Gross profit (loss) (1)	$	115,143		$	113,973		$	103,983		$	(89,796	)
Net income (loss)	$	56,945		$	54,360		$	67,522		$	(42,551	)
Net income (loss) per common share:
Basic	$	1.17		$	1.12		$	1.39		$	(0.88	)
Diluted (2)	$	1.17		$	1.11		$	1.37		$	(0.88	)
2015
Revenues	$	255,099		$	214,447		$	212,393		$	172,292
Gross loss (1)	$	(389,451	)	$	(419,666	)	$	(314,409	)	$	(492,636	)
Net loss	$	(248,354	)	$	(274,389	)	$	(205,281	)	$	(309,337	)
Net loss per common share:
Basic	$	(5.07	)	$	(5.58	)	$	(4.18	)	$	(6.29	)
Diluted	$	(5.07	)	$	(5.58	)	$	(4.18	)	$	(6.29	)

_________________________

(1) Gross profit (loss) excludes general and administrative expense, interest expense, (gain) loss on disposition of assets, gain (loss) on non-designated hedges and hedge ineffectiveness, net, income taxes, and other income (loss).

(2) Due to the effect of the loss in the fourth quarter, the diluted earnings per share for the year's four quarters does not equal annual earnings per share.

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Supplemental Oil And Gas Disclosures (Tables)

12 Months Ended

Dec. 31, 2015

Supplemental Oil and Gas Disclosures [Abstract]

Capitalized Costs Relating to Oil and Gas Producing Activities Disclosure [Table Text Block]

The capitalized costs at year-end and costs incurred during the year were as follows:

	2015			2014			2013
	(In thousands)
Capitalized costs:
Proved properties	$	5,401,618		$	4,990,753		$	4,235,712
Unproved properties	337,099			485,568			545,588
	5,738,717			5,476,321			4,781,300
Accumulated depreciation, depletion, amortization, and impairment	(4,631,404		)	(2,786,678		)	(2,439,458		)
Net capitalized costs	$	1,107,313		$	2,689,643		$	2,341,842
Cost incurred:
Unproved properties acquired	$	41,777		$	76,041		$	76,304
Proved properties acquired	179			5,723			—
Exploration	19,222			68,811			33,373
Development	208,845			615,252			424,314
Asset retirement obligation	(5,693		)	(37,687		)	(17,951		)
Total costs incurred	$	264,330		$	728,140		$	516,040

Schedule Of The Oil And Natural Gas Property Costs Not Being Amortized [Table Text Block]

The following table shows a summary of the oil and natural gas property costs not being amortized at December 31, 2015, by the year in which such costs were incurred:

	2015		2014		2013		2012 and Prior		Total
	(In thousands)
Unproved properties acquired and wells in progress	$	49,283	$	65,970	$	44,607	$	177,239	$	337,099

Results Of Operations For Producing Activities [Table Text Block]

The results of operations for producing activities are as follows:

	2015			2014			2013
	(In thousands)
Revenues	$	371,335		$	723,566		$	633,792
Production costs	(152,560		)	(165,315		)	(162,822		)
Depreciation, depletion, amortization, and impairment	(1,844,726		)	(347,220		)	(222,672		)
	(1,625,951		)	211,031			248,298
Income tax (expense) benefit	612,496			(82,028		)	(96,091		)
Results of operations for producing activities (excluding corporate overhead and financing costs)	$	(1,013,455	)	$	129,003		$	152,207

Schedule Of Proved Developed And Undeveloped Oil And Gas Reserve Quantities [Table Text Block]

Estimated quantities of proved developed oil, NGLs, and natural gas reserves and changes in net quantities of proved developed and undeveloped oil, NGLs, and natural gas reserves were as follows:

	Oil Bbls		NGLs Bbls		Natural Gas Mcf
	(In thousands)
2013
Proved developed and undeveloped reserves:
Beginning of year	21,998		35,166		555,647
Revision of previous estimates (1)	(2,113	)	836		2,421
Extensions and discoveries	4,678		7,273		68,611
Infill reserves in existing proved fields	2,299		1,945		21,573
Purchases of minerals in place	—		—		11
Production	(3,360	)	(3,914	)	(56,757	)
Sales	(1,737	)	(101	)	(9,722	)
End of year	21,765		41,205		581,784
Proved developed reserves:
Beginning of year	16,441		25,657		452,844
End of year	15,594		30,437		464,234
Proved undeveloped reserves:
Beginning of year	5,557		9,509		102,803
End of year	6,171		10,768		117,550
2014
Proved developed and undeveloped reserves:
Beginning of year	21,765		41,205		581,784
Revision of previous estimates (1)	(3,174	)	(2,266	)	(32,790	)
Extensions and discoveries	5,327		10,850		113,541
Infill reserves in existing proved fields	2,775		3,577		47,189
Purchases of minerals in place	236		88		368
Production	(3,844	)	(4,629	)	(58,854	)
Sales	(418	)	(296	)	(4,277	)
End of year	22,667		48,529		646,961
Proved developed reserves:
Beginning of year	15,594		30,437		464,234
End of year	17,448		35,850		500,950
Proved undeveloped reserves:
Beginning of year	6,171		10,768		117,550
End of year	5,219		12,679		146,011
2015
Proved developed and undeveloped reserves:
Beginning of year	22,667		48,529		646,961
Revision of previous estimates (1)	(3,954	)	(9,367	)	(139,514	)
Extensions and discoveries	1,208		1,948		20,974
Infill reserves in existing proved fields	670		1,861		22,641
Purchases of minerals in place	—		—		—
Production	(3,783	)	(5,274	)	(65,546	)
Sales	(73	)	(10	)	(648	)
End of year	16,735		37,687		484,868
Proved developed reserves:
Beginning of year	17,448		35,850		500,950
End of year	14,679		31,218		416,395
Proved undeveloped reserves:
Beginning of year	5,219		12,679		146,011
End of year	2,056		6,469		68,473

_________________________

(1) Natural gas revisions of previous estimates decreased primarily due to a decline in natural gas prices.

Standardized Measure Of Discounted Future Cash Flows Relating To Proved Reserves Disclosure [Table Text Block]

The standardized measure of discounted future net cash flows (SMOG) was calculated using 12-month average prices and year-end costs and statutory tax rates, adjusted for permanent differences that relate to existing proved oil, NGLs, and natural gas reserves. SMOG as of December 31 is as follows:

	2015			2014			2013
	(In thousands)
Future cash flows	$	2,475,898		$	6,398,236		$	5,573,119
Future production costs	(1,017,777		)	(2,069,636		)	(1,734,985		)
Future development costs	(228,445		)	(560,102		)	(571,170		)
Future income tax expenses	(230,544		)	(1,228,533		)	(1,044,608		)
Future net cash flows	999,132			2,539,965			2,222,356
10% annual discount for estimated timing of cash flows	(409,646		)	(1,104,221		)	(996,380		)
Standardized measure of discounted future net cash flows relating to proved oil, NGLs, and natural gas reserves	$	589,486		$	1,435,744		$	1,225,976

Schedule Of Principal Sources Of Changes In Standardized Measure Of Discounted Future Net Cash Flows [Table Text Block]

The principal sources of changes in the standardized measure of discounted future net cash flows were as follows:

	2015			2014			2013
	(In thousands)
Sales and transfers of oil and natural gas produced, net of production costs	$	(218,115	)	$	(558,252	)	$	(470,970	)
Net changes in prices and production costs	(1,356,333		)	(33,259		)	188,826
Revisions in quantity estimates and changes in production timing	(213,945		)	(135,125		)	(10,650		)
Extensions, discoveries, and improved recovery, less related costs	95,671			635,752			426,377
Changes in estimated future development costs	227,857			96,339			26,629
Previously estimated cost incurred during the period	59,117			164,430			96,457
Purchases of minerals in place	—			8,395			9
Sales of minerals in place	(3,338		)	(19,135		)	(43,435		)
Accretion of discount	209,979			179,190			147,579
Net change in income taxes	562,838			(98,119		)	(170,091		)
Other—net	(209,989		)	(30,448		)	(44,711		)
Net change	(846,258		)	209,768			146,020
Beginning of year	1,435,744			1,225,976			1,079,956
End of year	$	589,486		$	1,435,744		$	1,225,976

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Summary Of Significant Accounting Policies (Schedule Of Segment's Revenues) (Details)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Sunoco Logistics Partners L.P. | Oil and Natural Gas
Revenue, Major Customer [Line Items]
Segment's revenues	19.00%	14.00%	8.00%
Valero Energy Corporation | Oil and Natural Gas
Revenue, Major Customer [Line Items]
Segment's revenues	15.00%	24.00%	25.00%
QEP Resources, Inc. | Drilling
Revenue, Major Customer [Line Items]
Segment's revenues	25.00%	19.00%	18.00%
Whiting Petroleum Corp. (formerly Kodiak Oil and Gas Corp.) | Drilling
Revenue, Major Customer [Line Items]
Segment's revenues	7.00%	9.00%	10.00%
ONEOK Partners, L.P. | Mid-Stream
Revenue, Major Customer [Line Items]
Segment's revenues	29.00%	44.00%	57.00%
Tenaska Resources, LLC | Mid-Stream
Revenue, Major Customer [Line Items]
Segment's revenues	18.00%	22.00%	16.00%
Laclede Group, Inc. | Mid-Stream
Revenue, Major Customer [Line Items]
Segment's revenues	12.00%	16.00%	7.00%

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Summary Of Significant Accounting Policies (Schedule Of Fair Values Of The Net Assets) (Details) $ in Millions	Dec. 31, 2015 USD ($)
Derivative Counterparty [Line Items]
Total assets	$ 10.9
Canadian Imperial Bank of Commerce
Derivative Counterparty [Line Items]
Total assets	8.7
Bank of Montreal
Derivative Counterparty [Line Items]
Total assets	1.1
Scotiabank
Derivative Counterparty [Line Items]
Total assets	0.7
Bank of America Merrill Lynch
Derivative Counterparty [Line Items]
Total assets	$ 0.4

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Summary Of Significant Accounting Policies (Narrative) (Details)	3 Months Ended		12 Months Ended
	Sep. 30, 2015 USD ($) rig	Mar. 31, 2015 USD ($) rig	Dec. 31, 2015 USD ($) contract systems Unit MMcf	Dec. 31, 2014 USD ($) rig systems	Dec. 31, 2013 USD ($) rig	Dec. 31, 2012 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Number of daywork contracts | contract			9
Number of contracts, daywork expiring in one year | contract			5
Number of contracts, daywork expiring in two years | contract			4
Book Overdrafts			$ 22,100,000	$ 27,800,000
Concentration of cash			$ 2,300,000	18,400,000
Percentage of expected cash flows on undiscounted basis exceeding the carrying values of long-lived assets			99.00%
Impairment of contract drilling equipment			$ 8,314,000	74,318,000	$ 0
Assets held for sale			615,000	0
Impairment of gas gathering systems			26,966,000	7,068,000	0
Interest Costs Capitalized			21,700,000	32,200,000	33,700,000
Goodwill impairment			0	0	0
Additions to goodwill			$ 0	0	0
Percentage fair value exceeds carrying value for goodwill			19.00%
Goodwill deductible for tax purposes			$ 2,200,000
Intangible asset impairment			0	0	0
Amortization on intangible assets			0	0	700,000
Accumulated amortization on intangible assets			0	0	18,000,000
Directly related overhead costs capitalized			19,200,000	23,700,000	21,500,000
Average rates used for depreciation, depletion, and amortization per Boe			12.30	14.82	13.32
Unproved properties not being amortized			$ 337,099,000	485,568,000	545,588,000
Future discounted net cash flows discounted			10.00%
Unproved properties included in amortization			$ 114,400,000	73,700,000
Impairment of oil and natural gas properties			1,599,348,000	76,683,000	0
Non-cash ceiling test write-down net of tax			1,000,000,000	47,700,000
Revenues from transactions with operating segments of same entity			22,100,000	89,500,000	64,300,000
Eliminated associated operating expense			18,300,000	62,400,000	46,900,000
Eliminated yielding			$ 3,800,000	27,100,000	17,400,000
Number of partnerships | Unit			15
Unrecognized tax benefits			$ 410,000	$ 410,000	0	$ 0
Minimum
Summary Of Significant Accounting Policies [Line Items]
Number of days for drilling of one well			10 days
Duration length of contracts			6 months
Insurance coverage			$ 0
Maximum
Summary Of Significant Accounting Policies [Line Items]
Number of days for drilling of one well			90 days
Duration length of contracts			3 years
Insurance coverage			$ 1,000,000
Under-Produced Properties
Summary Of Significant Accounting Policies [Line Items]
Natural gas balancing (MMcf) | MMcf			4,700
Over-Produced Properties
Summary Of Significant Accounting Policies [Line Items]
Natural gas balancing (MMcf) | MMcf			4,800
Natural Gas Balancing
Summary Of Significant Accounting Policies [Line Items]
Accounts receivable			$ 2,500,000
Liability recognized to under production			$ 5,000,000
Drilling Equipment
Summary Of Significant Accounting Policies [Line Items]
Minimum depreciation percentage for idle drilling rigs			20.00%
Number of drilling rigs removed from service | rig				31
Drilling Equipment | Minimum
Summary Of Significant Accounting Policies [Line Items]
Useful life, years			15 years
Gas Gathering and Processing Equipment
Summary Of Significant Accounting Policies [Line Items]
Number of gas gathering systems impaired | systems			3	3
Property, Plant and Equipment, Other Types | Minimum
Summary Of Significant Accounting Policies [Line Items]
Useful life, years			3 years
Property, Plant and Equipment, Other Types | Maximum
Summary Of Significant Accounting Policies [Line Items]
Useful life, years			15 years
Drilling
Summary Of Significant Accounting Policies [Line Items]
Impairment of long-lived assets held-for-use			$ 0	$ 0	$ 0
Drilling Equipment
Summary Of Significant Accounting Policies [Line Items]
Number of rigs sold | rig	30	1		4	5
Net book value of drilling rigs sold	11.0	0.3		16.3
Gain (loss) on sale of drilling rigs	$ (7,300,000)	$ 7,900		$ 9,600,000	$ 16,500,000

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Divestitures - Narrative (Details)	1 Months Ended	3 Months Ended		12 Months Ended
	Aug. 31, 2013 USD ($)	Sep. 30, 2015 USD ($) rig	Mar. 31, 2015 USD ($) rig	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($) rig	Dec. 31, 2013 USD ($) rig
Oil and Natural Gas
Divestiture [Line Items]
Proceeds from divestiture of assets				$ 1,900,000	$ 33,100,000	$ 21,700,000
Oil and Natural Gas | Bakken Properties
Divestiture [Line Items]
Proceeds from divestiture of assets	$ 57,100,000
Drilling Equipment
Divestiture [Line Items]
Net book value of drilling rigs sold		11.0	0.3		16.3
Number of rigs sold | rig		30	1		4	5
Gain (loss) on sale of drilling rigs		$ (7,300,000)	$ 7,900		$ 9,600,000	$ 16,500,000
Number of rigs held for sale | rig						4

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Earnings Per Share (Schedule Of Earnings (Loss) Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014		Sep. 30, 2014		Jun. 30, 2014		Mar. 31, 2014		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Earnings Per Share [Abstract]
Income (loss) of basic earnings (loss) per common share	$ (309,337)	$ (205,281)	$ (274,389)	$ (248,354)	$ (42,551)		$ 67,522		$ 54,360		$ 56,945		$ (1,037,361)	$ 136,276	$ 184,746
Income (loss) of effect of dilutive stock options, restricted stock, and SARs													0	0	0
Income (loss) of diluted earnings (loss) per common share													$ (1,037,361)	$ 136,276	$ 184,746
Weighted shares of basic earnings (loss) per common share													49,110	48,611	48,218
Weighted shares of effect of dilutive stock options, restricted stock, and SARs													0	472	354
Weighted shares of diluted earnings (loss) per common share													49,110	49,083	48,572
Per share amount of basic earnings (loss) per common share	$ (6.29)	$ (4.18)	$ (5.58)	$ (5.07)	$ (0.88)		$ 1.39		$ 1.12		$ 1.17		$ (21.12)	$ 2.80	$ 3.83
Per share amount of effect of dilutive stock options, restricted stock, and SARs													0.00	(0.02)	(0.03)
Per share amount of diluted earnings (loss) per common share	$ (6.29)	$ (4.18)	$ (5.58)	$ (5.07)	$ (0.88)	[1]	$ 1.37	[1]	$ 1.11	[1]	$ 1.17	[1]	$ (21.12)	$ 2.78	$ 3.80

[1] Due to the effect of the loss in the fourth quarter, the diluted earnings per share for the year's four quarters does not equal annual earnings per share.

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Earnings (Loss) Per Share (Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share) (Details) - Stock options and SARs - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Options and SARs	261,270	73,500	149,665
Average Exercise Price	$ 50.34	$ 64.43	$ 58.41

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Earnings (Loss) Per Share Earnings (Loss) Per Share (Narrative) (Details)	12 Months Ended
	Dec. 31, 2015 shares
Stock options, restricted stock, and SARs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share due to net loss	186,000

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Accrued Liabilities (Accrued Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Accrued Liabilities [Abstract]
Lease operating expenses	$ 17,220	$ 20,709
Employee costs	12,641	31,451
Interest payable	6,321	6,654
Taxes	3,767	3,284
Third-party credits	3,326	2,825
Other	3,643	5,248
Total accrued liabilities	$ 46,918	$ 70,171

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Long-Term Debt And Other Long-Term Liabilities (Long-Term Debt) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Long-term debt and other long-term liabilites [Abstract]
Credit agreement with an average interest rates of 2.6% and 2.9% at December 31, 2015 and 2014, respectively	$ 281,000	$ 166,000
6.625% senior subordinated notes due 2021, net of unamortized discount of $3.3 million and $3.8 million at December 31, 2015 and 2014, respectively	646,662	646,163
Total long-term debt	$ 927,662	$ 812,163
Line of Credit Facility, Interest Rate at Period End	2.60%	2.90%
Debt Instrument, Unamortized Discount	$ 3,300	$ 3,800

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Long-Term Debt And Other Long-Term Liabilities (Other Long-Term Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Long-term debt and other long-term liabilites [Abstract]
ARO liability	$ 98,297	$ 100,567	$ 133,657
Capital lease obligations	22,466	25,876
Workers' compensation	16,551	17,997
Separation benefit plans	9,886	11,276
Gas balancing liability	5,047	3,623
Deferred compensation plan	4,244	4,055
Other	410	410
Other liabilities	156,901	163,804
Less current portion	16,560	15,019
Total other long-term liabilities	$ 140,341	$ 148,785

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Long-Term Debt And Other Long-Term Liabilities Long-Term Debt and Other Long-Term Liabilities (Capital Leases) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Ending December 31, [Abstract]
2016	$ 6,168
2017	6,168
2018	6,168
2019	6,168
2020	6,168
2021	3,769
Total future payments	34,609
Less payments related to:
Maintenance	9,445
Interest	2,698
Present value of future minimum payments	$ 22,466	$ 25,876

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Long-Term Debt And Other Long-Term Liabilities (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Credit facility maturity date	4/10/2020
Credit Facility Maximum Credit Amount	$ 900,000
Origination, agency and syndication fees	$ 2,600
Debt instrument, variable interest rate, payable assessment period	90 days
LIBOR interest rate plus one percent	LIBOR plus 1.00%
Line of credit facility, amount borrowed	$ 281,000		$ 166,000
Current ratio of credit facility	1 to 1
Leverage ratio of long-term debt	4 to 1
Aggregate principal amount	$ 650,000
Interest percentage of senior subordinated notes	6.625%
Debt Instrument, Maturity Date	May 15, 2021
Deducting fees for debt issuance	$ 14,700
Equal redemption price percentage of principal amount of debt	100.00%
Senior notes repurchase price in percentage	101.00%
Year One	$ 16,600
Year Two	5,700
Year Three	59,900
Year Four	9,500
Year Five	$ 290,000
Number of compressors under capital lease agreement	20
Capital lease term	7 years
Capital Lease Obligations, Current	$ 3,500
Capital Lease Obligations, Noncurrent	$ 18,900
Discount rate capital leases	4.00%
Maintenance	$ 9,445
Interest	2,698
Capital leases, future minimum payments, average annual payment	$ 4,000
Capital lease fair market value percentage for purchase	10.00%
Minimum
Debt Instrument [Line Items]
Commitment fee percentage under credit facility	0.375%
LIBOR plus interest rate	1.75%
Maximum
Debt Instrument [Line Items]
Commitment fee percentage under credit facility	0.50%
LIBOR plus interest rate	2.50%
Payments of dividends exceeding percentage	30.00%
Line Of Credit Facility Commitment Amount]
Debt Instrument [Line Items]
Credit facility current credit amount	$ 500,000
Line Of Credit Facility Lender Determined Amount
Debt Instrument [Line Items]
Credit facility current credit amount	$ 550,000	$ 725,000

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Asset Retirement Obligations (Schedule Of Asset Retirement Obligations) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014
Asset Retirement Obligation Disclosure [Abstract]
ARO liability, January 1:		$ 100,567	$ 133,657
Accretion of discount		3,453	4,599
Liability incurred		6,754	6,246
Liability settled		(2,893)	(4,490)
Liability sold		(421)	(1,206)
Revision of estimates	[1]	(9,163)	(38,239)
ARO liability, December 31:		98,297	100,567
Less current portion		3,965	3,204
Total long-term ARO liability		$ 94,332	$ 97,363

[1] Plugging liability estimates were revised in both 2015 and 2014 for updates in the cost of services used to plug wells over the preceding year. We had various upward and downward adjustments as well as changes in estimated timing of cash flows.

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Income Taxes (Reconciliation Of Income Tax Expense (Benefit)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Income tax expense (benefit) computed by applying the statutory rate	$ (582,508)	$ 78,029	$ 105,514
State income tax, net of federal benefit	(45,768)	6,131	8,290
Statutory depletion and other	1,328	2,503	2,919
Income tax expense (benefit)	$ (626,948)	$ 86,663	$ 116,723

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Income Taxes (Schedule Of Total Provision For Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Current taxes, Federal	$ (20,612)	$ 8,594	$ 15,845
Current taxes, State	(4)	784	146
Current taxes	(20,616)	9,378	15,991
Deferred taxes, Federal	(535,691)	68,360	87,839
Deferred taxes, State	(70,641)	8,925	12,893
Deferred taxes	(606,332)	77,285	100,732
Total provision	$ (626,948)	$ 86,663	$ 116,723

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Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Allowance for losses and nondeductible accruals	$ 56,479	$ 55,231
Net operating loss carryforward	140,863	54,901
Alternative minimum tax and research and development tax credit carryforward	5,409	25,991
Deferred tax assets, total	202,751	136,123
Depreciation, depletion, amortization, and impairment	(464,295)	(1,000,811)
Net deferred tax liability	(261,544)	(864,688)
Current deferred tax asset	14,206	11,527
Non-current-deferred tax liability	$ (275,750)	$ (876,215)

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Income Taxes Income Taxes (Schedule of Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Balance at January 1:	$ 410	$ 0	$ 0
Additions based on tax positions related to current year	0	410	0
Additions for tax positions of prior years	0	0	0
Reductions for tax positions of prior years	0	0	0
Settlements	0	0	0
Balance at December 31:	$ 410	$ 410	$ 0

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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 351,400
Unrecognized tax benefits	$ 410	$ 410	$ 0	$ 0
Start
Operating Loss Carryforwards [Line Items]
Operating loss expiration period	Jan. 01, 2021
End
Operating Loss Carryforwards [Line Items]
Operating loss expiration period	Dec. 31, 2035

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Employee Benefit Plans (Details) $ in Millions			12 Months Ended
	May. 05, 2004 yr	Jan. 01, 1997 week	Dec. 31, 2015 USD ($) yr shares		Dec. 31, 2014 USD ($) shares	Dec. 31, 2013 USD ($) shares
Defined Benefit Plan Disclosure [Line Items]
Recognized stock compensation expense			$ 15.3	[1]	$ 17.4	$ 16.1
Employment contract period extension, years			1 year
Grace period following the first anniversary			30 days
Employee Thrift Plan
Defined Benefit Plan Disclosure [Line Items]
Contribution of shares, common stock | shares			235,104		120,333	111,995
Recognized stock compensation expense			$ 6.2		$ 5.2	$ 6.0
Salary Deferral Plan
Defined Benefit Plan Disclosure [Line Items]
Liability recorded under deferral plan			4.2		4.1
Separation Plan
Defined Benefit Plan Disclosure [Line Items]
Service period, years		20 years
Maximum period benefit, weeks | week		104
Separation benefit plans expense			$ 3.0		$ 2.7	$ 2.4
Special Separation Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Service period, years	20 years
Age limit | yr	65
Change Of Control Contracts
Defined Benefit Plan Disclosure [Line Items]
Employee contract period, years | yr			3
Multiple for determination compensation			2.9
Plan 401k
Defined Benefit Plan Disclosure [Line Items]
Additional period for 401k, years			3 years

[1] Recognized stock compensation was reduced by $3.2 million, capitalized stock compensation cost for our oil and natural gas properties was reduced by $0.2 million, and the tax benefit was reduced by $1.2 million for lower expected payouts related to the performance shares.

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Transactions With Related Parties Transactions With Related Parties (Schedule of Amount Received in Public and Private Partnerships) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Related Party Transaction [Line Items]
Contract drilling	$ 0	$ 4	$ 16
Well supervision and other fees	423	435	470
General and administrative expense reimbursement	$ 18	$ 39	$ 36

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Transactions With Related Parties (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) Unit wells	Dec. 31, 2014 USD ($) wells	Dec. 31, 2013 USD ($)
Related Party Transaction [Line Items]
Number of oil and gas limited partnerships | Unit	15
Number of oil and gas limited partnerships for third party investment | Unit	2
Number of oil and gas limited partnerships for employee investment | Unit	13
Minimum
Related Party Transaction [Line Items]
Interest rate of employee partnerships in oil and gas properties	1.00%
Maximum
Related Party Transaction [Line Items]
Interest rate of employee partnerships in oil and gas properties	15.00%
G. Bailey Peyton IV
Related Party Transaction [Line Items]
Payments for royalties	$ 800	$ 1,300	$ 1,400
Toklan Oil and Gas Company | John Nikkel
Related Party Transaction [Line Items]
Related party ownership percentage	25.80%
Number of wells drilled	0	2	0
Completed wells | wells	1	1
Revenue from related parties	$ 500	$ 1,500
Cash received from related parties	900	1,100
Related party accounts receivable balance	0	400
Payments for royalties	$ 0	$ 200	$ 0
Toklan Oil and Gas Company | Robert Nikkel
Related Party Transaction [Line Items]
Related party ownership percentage	20.00%
West Thomas Field Services, LLC | John Nikkel
Related Party Transaction [Line Items]
Related party ownership percentage	25.00%
Revenue from related parties	$ 100
West Thomas Field Services, LLC | Robert Nikkel
Related Party Transaction [Line Items]
Related party ownership percentage	20.00%
Gas Gathering and Processing Equipment | Toklan Oil and Gas Company | John Nikkel
Related Party Transaction [Line Items]
Amount received from Toklan for gathering system	$ 500

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Stock-Based Compensation (Schedule Of Restricted Stock Awards Stock Options And SAR) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015		Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized stock compensation expense	$ 15.3	[1]	$ 17.4	$ 16.1
Capitalized stock compensation cost for our oil and natural gas properties	3.5	[1]	3.7	3.5
Tax benefit on stock based compensation	5.8	[1]	$ 6.7	$ 6.2
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reduction in recognized stock compensation expense related to performance shares	3.2
Reduction in capitalized stock compensation cost for our oil and natural gas properties related to performance shares	0.2
Reduction in tax benefit on stock based compensation related to performance shares	$ 1.2

[1] Recognized stock compensation was reduced by $3.2 million, capitalized stock compensation cost for our oil and natural gas properties was reduced by $0.2 million, and the tax benefit was reduced by $1.2 million for lower expected payouts related to the performance shares.

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Stock-Based Compensation Stock-Based Compensation (Activity Pertaining to Stock Appreciation Rights) (Details) - Stock Appreciation Rights (SARs) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares, beginning balance	131,770	145,901	145,901
Weighted average price, beginning balance	$ 46.60	$ 46.59	$ 46.59
Number of shares, granted	0	0	0
Weighted average price, granted	$ 0	$ 0	$ 0
Number of shares, exercised	0	(14,131)	0
Weighted average price, exercised	$ 0.00	$ 46.50	$ 0
Number of shares, forfeited	0	0	0
Weighted average price, forfeited	$ 0	$ 0	$ 0
Number of shares, ending balance	131,770	131,770	145,901
Weighted average price, ending balance	$ 46.60	$ 46.60	$ 46.59

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Stock-Based Compensation Stock-Based Compensation (Shares Authorized Under Stock Appreciation Rights By Exercise Price) (Details) - Stock Appreciation Rights (SARs)	12 Months Ended
	Dec. 31, 2015 $ / shares shares
$44.31
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding and exercisable options, number of shares | shares	91,255
Outstanding and exercisable options weighted average remaining contractual life, years	2 years
Outstanding and exercisable options, weighted average exercise price | $ / shares	$ 44.31
$51.76
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding and exercisable options, number of shares | shares	40,515
Outstanding and exercisable options weighted average remaining contractual life, years	10 months 24 days
Outstanding and exercisable options, weighted average exercise price | $ / shares	$ 51.76

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Stock-Based Compensation (Activity Pertaining To Restricted Stock Awards) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Restricted Stock - Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares, beginning balance	900,286	776,743	589,527
Weighted average price, beginning balance	$ 50.81	$ 48.70	$ 48.11
Number of shares, granted	724,442	455,122	453,549
Weighted average price, granted	$ 34.06	$ 53.72	$ 48.20
Number of shares, vested	(382,902)	(304,804)	(248,003)
Weighted average price, exercised	$ 49.69	$ 49.68	$ 46.46
Number of shares, forfeited	(28,004)	(26,775)	(18,330)
Weighted average price, forfeited	$ 45.33	$ 51.92	$ 47.85
Number of shares, ending balance	1,213,822	900,286	776,743
Weighted average price, ending balance	$ 41.29	$ 50.81	$ 48.70
Non-employee Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares, beginning balance	35,136	35,704	24,606
Weighted average price, beginning balance	$ 50.08	$ 41.07	$ 40.23
Number of shares, granted	25,848	13,768	21,128
Weighted average price, granted	$ 34.04	$ 63.91	$ 41.65
Number of shares, vested	(18,920)	(14,336)	(10,030)
Weighted average price, exercised	$ 46.51	$ 40.93	$ 40.23
Number of shares, forfeited	0	0	0
Weighted average price, forfeited	$ 0.00	$ 0.00	$ 0.00
Number of shares, ending balance	42,064	35,136	35,704
Weighted average price, ending balance	$ 41.83	$ 50.08	$ 41.07
Time Vested | Restricted Stock - Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares, beginning balance	724,766	652,835	523,024
Number of shares, granted	576,361	383,448	396,144
Number of shares, vested	(343,657)	(291,712)	(248,003)
Number of shares, forfeited	(20,808)	(19,805)	(18,330)
Number of shares, ending balance	936,662	724,766	652,835
Performance Shares | Restricted Stock - Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares, beginning balance	175,520	123,908	66,503
Number of shares, granted	148,081	71,674	57,405
Number of shares, vested	(39,245)	(13,092)	0
Number of shares, forfeited	(7,196)	(6,970)	0
Number of shares, ending balance	277,160	175,520	123,908

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Stock-Based Compensation Stock-Based Compensation (Activity Pertaining to Stock Options) (Details) - Stock Options - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares, beginning balance	9,500	68,920	118,030
Weighted average price, beginning balance	$ 37.69	$ 37.81	$ 33.03
Number of shares, granted	0	0	0
Weighted average price, granted	$ 0.00	$ 0.00	$ 0.00
Number of shares, exercised	0	(21,490)	(48,110)
Weighted average price, exercised	$ 0.00	$ 37.83	$ 26.09
Number of shares, forfeited	(9,500)	(37,930)	(1,000)
Weighted average price, forfeited	$ 37.69	$ 37.83	$ 37.83
Number of shares, ending balance	0	9,500	68,920
Weighted average price, ending balance	$ 0.00	$ 37.69	$ 37.81

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Stock-Based Compensation Stock-Based Compensation (Activity Pertaining to Nonemployee Director Stock Award Plan) (Details) - Directors Plan - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares, beginning balance	150,500	171,500	192,500
Weighted average price, beginning balance	$ 54.18	$ 51.70	$ 49.39
Number of shares, granted	0	0	0
Weighted average price, granted	$ 0.00	$ 0.00	$ 0.00
Number of shares, exercised	0	(21,000)	(17,500)
Weighted average price, exercised	$ 0.00	$ 33.94	$ 32.53
Number of shares, forfeited	(21,000)	0	(3,500)
Weighted average price, forfeited	$ 54.35	$ 0.00	$ 20.46
Number of shares, ending balance	129,500	150,500	171,500
Weighted average price, ending balance	$ 54.15	$ 54.18	$ 51.70

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Stock-Based Compensation (Shares Authorized Under Stock Option Plans By Exercise Price Range) (Details) - Directors Plan	12 Months Ended
	Dec. 31, 2015 $ / shares shares
$31.30 - $41.21
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Minimum Limit	$ 31.30
Maximum limit	$ 41.21
Outstanding and exercisable options, number of shares | shares	38,500
Outstanding and exercisable options weighted average remaining contractual life, years	3 years 10 months 12 days
Outstanding and exercisable options, weighted average exercise price	$ 37.58
$53.81 - $73.26
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Minimum Limit	53.81
Maximum limit	$ 73.26
Outstanding and exercisable options, number of shares | shares	91,000
Outstanding and exercisable options weighted average remaining contractual life, years	2 years 7 months
Outstanding and exercisable options, weighted average exercise price	$ 61.16

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Stock-Based Compensation (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	May. 06, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to unvested awards	$ 13.8
Unrecognized compensation cost, expect to be capitalized	$ 2.4
Weighted average years over which this cost will be recognized	8 months 12 days
Incentive Stock Grants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares of common stock allowed for the issuance				2,000,000
Stock Appreciation Rights (SARs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares, granted	0	0	0
Expire years	10 years
Shares vested	0	0	0
Number of shares, ending balance	131,770	131,770	145,901
Exercisable options intrinsic value	$ 0.0
Weighted average remaining contractual term, years	1 year 7 months 6 days
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares of common stock allowed for the issuance				4,500,000
Number of shares, ending balance	1,255,886
Exercisable options intrinsic value	$ 15.3
Grant date fair value	$ 24.5	$ 24.1	$ 21.3
Number of shares, vested	(401,822)
Exercised intrinsic value	$ 11.2
Restricted stock weighted average remaining contractual term, years	8 months 12 days
Restricted Stock | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance percentage criteria	0.00%
Restricted Stock | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Period	3 years
Performance percentage criteria	150.00%
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expire years	10 years
Shares vested	0	0	0
Maximum Number of Shares of Common Stock Previously Allowed for the Issuance	2,700,000
Vesting rate of options	20.00%
Directors Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expire years	10 years
Exercisable options intrinsic value	$ 0.0
Weighted average remaining contractual term, years	3 years
Vesting Period	6 months
Director option awards	3,500
2015 | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance percentage criteria	2.00%
2014 | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance percentage criteria	57.00%
2013 | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance percentage criteria	10.00%

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Derivatives Derivatives (Schedule of Non-designated Hedges Outstanding) (Details)	12 Months Ended
	Dec. 31, 2015 $ / Unit MMBTU bbl
Natural gas | Swap | If Nymex | Jan'16 - Dec'16
Derivative Instruments, Gain (Loss) [Line Items]
Non Designated Derivative Instrument Weighted Average Fixed Price For Swaps	2.625
Hedged Volume (MMBtu/day) | MMBTU	35,000
Natural gas | Collar | If Nymex | Jan'16 - Dec'16
Derivative Instruments, Gain (Loss) [Line Items]
Ceiling Price	2.88
Floor Price	2.40
Hedged Volume (MMBtu/day) | MMBTU	42,000
Natural gas | Three-way collar | If Nymex | Jan'16 - Dec'16
Derivative Instruments, Gain (Loss) [Line Items]
Ceiling Price	3.26
Subfloor Price	2.20
Floor Price	2.70
Hedged Volume (MMBtu/day) | MMBTU	13,500
Natural gas | Three-way collar | If Nymex | Jan'17 - Dec'17
Derivative Instruments, Gain (Loss) [Line Items]
Ceiling Price	3.32
Subfloor Price	2.00
Floor Price	2.50
Hedged Volume (MMBtu/day) | MMBTU	15,000
Crude Oil | Collar | Wti Nymex | Jan'16 - Jun'16
Derivative Instruments, Gain (Loss) [Line Items]
Ceiling Price	55.62
Floor Price	46.36
Hedged Volume (Bbl/day) | bbl	2,150
Crude Oil | Collar | Wti Nymex | Jul'16 - Dec'16
Derivative Instruments, Gain (Loss) [Line Items]
Ceiling Price	56.40
Floor Price	47.50
Hedged Volume (Bbl/day) | bbl	1,450
Crude Oil | Three-way collar | Wti Nymex | Jan'16 - Dec'16
Derivative Instruments, Gain (Loss) [Line Items]
Ceiling Price	57.00
Subfloor Price	35.00
Floor Price	46.50
Hedged Volume (Bbl/day) | bbl	700
Crude Oil | Three-way collar | Wti Nymex | Jul'16 - Dec'16
Derivative Instruments, Gain (Loss) [Line Items]
Ceiling Price	63.50	[1]
Subfloor Price	35.00	[1]
Floor Price	47.50	[1]
Hedged Volume (Bbl/day) | bbl	700	[1]
Crude Oil | Three-way collar | Wti Nymex | Jan'17 - Dec'17
Derivative Instruments, Gain (Loss) [Line Items]
Ceiling Price	63.90
Subfloor Price	37.50
Floor Price	50.00
Hedged Volume (Bbl/day) | bbl	750

[1] We pay our counterparty a premium, which can be and is being deferred until settlement.

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Derivatives (Schedule Of Subsequent Non-designated Hedges) (Details) - Subsequent to December 31, 2015 - Natural gas - If Nymex - Swap	2 Months Ended
	Feb. 25, 2016 $ / Unit MMBTU
Feb'16 - Dec'16
Derivative Instruments, Gain (Loss) [Line Items]
Non Designated Derivative Instrument Weighted Average Fixed Price For Swaps | $ / Unit	2.495
Hedged Volume (MMBtu/day) | MMBTU	10,000
Jan'17 - Dec'17
Derivative Instruments, Gain (Loss) [Line Items]
Non Designated Derivative Instrument Weighted Average Fixed Price For Swaps | $ / Unit	2.795
Hedged Volume (MMBtu/day) | MMBTU	10,000

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Derivatives (Fair Value Of Derivative Instruments And Locations In Balance Sheets) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Current derivative assets	$ 10,186	$ 31,139
Non-current derivative assets	968	0
Total derivatives assets	11,154	31,139
Non-current derivative liabilities	285	0
Total derivative liabilities	285	0
Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Current derivative assets	10,186	31,139
Non-current derivative assets	968	0
Current derivative liabilities	0	0
Non-current derivative liabilities	$ 285	$ 0

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Derivatives (Effect Of Derivative Instruments Recognized In Statement Of Operations, Not Designated As Hedging Instruments) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Gain on derivatives not designated as hedges		$ 26,345	$ 30,147
Cash receipts (payments) on derivatives settled		46,615	(6,038)
Commodity Contract
Derivative Instruments, Gain (Loss) [Line Items]
Gain on derivatives not designated as hedges	[1]	$ 26,345	$ 30,147

[1] Amount settled during the period is a gain of $46,615 and a loss of $6,038, respectively.

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Derivatives (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Derivative [Line Items]
Accumulated OCI gain net of tax	$ 0	$ 0

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Fair Value Measurements (Recurring Fair Value Measurements) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial assets (liabilities)	$ 10,900
Commodity Contract
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets	11,154	$ 31,139
Liabilities	(285)	0
Financial assets (liabilities)	10,869	31,139
Commodity Contract | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets	2,794	27,784
Liabilities	(1,019)	0
Financial assets (liabilities)	1,775	27,784
Commodity Contract | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets	10,145	3,355
Liabilities	(1,051)	0
Financial assets (liabilities)	9,094	3,355
Commodity Contract | Effect of Netting
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets	(1,785)	0
Liabilities	1,785	0
Financial assets (liabilities)	$ 0	$ 0

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Fair Value Measurements (Reconciliations Of Level 3 Fair Value Measurements) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Beginning of period		$ 3,355	$ (2,595)
Included in earnings	[1]	15,260	6,108
Settlements		(9,521)	(158)
End of period		9,094	3,355
Total gains for the period included in earnings attributable to the change in unrealized gain relating to assets still held at end of period		$ 5,739	$ 5,950

[1] Commodity derivatives are reported in the Consolidated Statements of Operations in gain (loss) on derivatives not designated as hedges and hedge ineffectiveness, net.

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Fair Value Measurements (Schedule Of Quantitative Information About Unobservable Inputs) (Details) - Level 3 $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) $ / Unit
Crude Oil | Collar
Derivative assets, Fair Value | $	$ 3,893	[1]
Derivatives assets, Valuation Technique(s)	Discounted cash flow	[1]
Unobservable Input	Forward commodity price curve	[1]
Crude Oil | Three-way collar
Derivative assets, Fair Value | $	$ 3,470	[1]
Derivatives assets, Valuation Technique(s)	Discounted cash flow	[1]
Unobservable Input	Forward commodity price curve	[1]
Crude Oil | Minimum | Collar
Derivative, Forward Price	0.4
Crude Oil | Minimum | Three-way collar
Derivative, Forward Price	0.4
Crude Oil | Maximum | Collar
Derivative, Forward Price	55.05
Crude Oil | Maximum | Three-way collar
Derivative, Forward Price	71.66
Natural gas | Collar
Derivative assets, Fair Value | $	$ 1,000	[1]
Derivatives assets, Valuation Technique(s)	Discounted cash flow	[1]
Unobservable Input	Forward commodity price curve	[1]
Natural gas | Three-way collar
Derivative assets, Fair Value | $	$ 731	[1]
Derivatives assets, Valuation Technique(s)	Discounted cash flow	[1]
Unobservable Input	Forward commodity price curve	[1]
Natural gas | Minimum | Collar
Derivative, Forward Price	0.4
Natural gas | Minimum | Three-way collar
Derivative, Forward Price	0.4
Natural gas | Maximum | Collar
Derivative, Forward Price	1.26
Natural gas | Maximum | Three-way collar
Derivative, Forward Price	1.93

[1] The commodity contracts detailed in this category include non-exchange-traded crude oil and natural gas collars and three-way collars that are valued based on NYMEX. The forward pricing range represents the low and high price expected to be received within the settlement period.

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Fair Value Measurements (Narrative) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]
Collateral Already Posted, Aggregate Fair Value	$ 0
6.625% senior subordinated notes due 2021, net of unamortized discount of $3.3 million and $3.8 million at December 31, 2015 and 2014, respectively	646,662	$ 646,163
Estimated fair value of long-term debt	$ 455,500	$ 605,500

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Accumulated Other Comprehensive Income (Changes in accumulated other comprehensive income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Balance at January 1:	$ 0	$ 0	$ 7,587
Other comprehensive income before reclassification	0	0	(7,349)
Amounts reclassified from accumulated other comprehensive income	0	0	(238)
New current-period other comprehensive income			(7,587)
Balance at December 31:	$ 0	$ 0	$ 0

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Accumulated Other Comprehensive Income (Schedule of accumulated other comprehensive income (loss)) (Details) - Commodity Contract - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax	$ 0	$ 0	$ 413
Tax expense	0	0	(175)
Total reclassification for the period	0	0	238
Oil and natural gas revenue
Amounts reclassified from accumulated other comprehensive income	0	0	603
Gain (loss) on derivatives not designated as hedges and hedge ineffectiveness
Derivative Instruments, Gain (Loss) Recognized in Income	$ 0	$ 0	$ (190)

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Commitments And Contingencies (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Other Commitments [Line Items]
Lease expiration date	Dec. 31, 2021
Future minimum rental payments under leases, year one	$ 6,400,000
Future minimum rental payments under leases, year two	1,000,000
Future minimum rental payments under leases, year three	700,000
Future minimum rental payments under leases, year four	92,000
Future minimum rental payments under leases, year five	72,000
Rent expense incurred	$ 12,900,000	$ 13,600,000	$ 16,900,000
Number of compressors under capital lease agreement	20
Capital lease term	7 years
2016	$ 6,168,000
2017	6,168,000
2018	6,168,000
2019	6,168,000
2020	6,168,000
2021	3,769,000
Maintenance	9,445,000
Interest	2,698,000
Capital leases, future minimum payments, average annual payment	$ 4,000,000
Capital lease fair market value percentage for purchase	10.00%
Repurchase of limited units outstanding	20.00%
Repurchase of limited units outstanding amount	$ 118,000	$ 45,000	$ 16,000
Drilling Equipment
Other Commitments [Line Items]
Other Commitment, Due in Next Twelve Months	6,700,000
Corporate, Non-Segment
Other Commitments [Line Items]
Other Commitment, Due in Next Twelve Months	1,400,000
Other Commitment, Due in Second Year	$ 500,000

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Industry Segment Information (Revenue From Different Segments) (Details) $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Sep. 30, 2014 USD ($)	Jun. 30, 2014 USD ($)	Mar. 31, 2014 USD ($)	Dec. 31, 2015 USD ($) systems		Dec. 31, 2014 USD ($) rig systems		Dec. 31, 2013 USD ($)
Revenues
Oil and natural gas										$ 385,774		$ 740,079		$ 649,718
Contract drilling										287,767		566,012		479,091
Elimination of inter-segment revenue										(22,099)		(89,495)		(64,313)
Contract drilling net of inter-segment revenue										265,668		476,517		414,778
Gas gathering and processing										268,012		445,934		378,397
Elimination of inter-segment revenue										(65,223)		(89,586)		(91,043)
Gas gathering and processing net of inter-segment revenue										202,789		356,348		287,354
Total revenues		$ 172,292	$ 212,393	$ 214,447	$ 255,099	$ 378,551	$ 400,974	$ 405,431	$ 387,988	854,231		1,572,944		1,351,850
Operating Income (Loss):
Oil and natural gas										(1,631,564)	[1]	199,392	[1]	239,219
Contract drilling										44,811	[2]	41,896	[2]	96,304
Gas gathering and processing										(29,409)	[3]	2,015	[3]	10,757
Total operating income (loss)	[4]									(1,616,162)		243,303		346,280
General and administrative										(35,345)		(42,023)		(38,323)
Gain (loss) on disposition of assets										(7,229)		8,953		17,076
Interest expense, net										(31,963)		(17,371)		(15,015)
Gain (loss) on derivatives not designated as hedges and hedge ineffectiveness, net										26,345		30,147		(8,374)
Other										45		(70)		(175)
Income (loss) before income taxes										(1,664,309)		222,939		301,469
Identifiable assets:
Oil and natural gas		1,218,036				2,856,833				1,218,036		2,856,833		2,441,792
Contract drilling		993,015				1,059,980				993,015		1,059,980		1,042,661
Gas gathering and processing		478,661				500,255				478,661		500,255		473,717
Total identifiable assets	[5]	2,689,712				4,417,068				2,689,712		4,417,068		3,958,170
Corporate assets		118,797				56,660				118,797		56,660		64,220
Total assets		$ 2,808,509				$ 4,473,728				2,808,509		4,473,728		4,022,390
Capital expenditures:
Oil and natural gas										267,944		740,262		531,233
Contract drilling										84,802		176,683		64,325
Gas gathering and processing										63,476		79,268	[6]	96,085
Other										38,065		17,067		4,483
Total capital expenditures										454,287		1,013,280		696,126
Oil and natural gas:
Depreciation, depletion, and amortization										251,944		276,088		226,498
Impairment of oil and natural gas properties										1,599,348		76,683		0
Contract drilling:
Impairment of contract drilling equipment										8,314		74,318		0
Gas gathering and processing:
Depreciation and amortization										43,676		40,434		33,191
Impairment of gas gathering systems										26,966		7,068		0
Capital lease obligations incurred												28,200
Non-cash ceiling test write-down net of tax										1,000,000		47,700
Operating Segments
Oil and natural gas:
Depreciation, depletion, and amortization										251,944		276,088		226,498
Impairment of oil and natural gas properties										1,599,348	[1]	76,683	[1]	0
Contract drilling:
Depreciation										56,135		85,370		71,194
Impairment of contract drilling equipment										8,314	[2]	74,318	[2]	0
Gas gathering and processing:
Depreciation and amortization										43,676		40,434		33,191
Impairment of gas gathering systems										26,966	[3]	7,068	[3]	0
Other										3,075		3,051		3,024
Total depreciation, depletion, amortization and impairment										$ 1,989,458		$ 563,012		$ 333,907
Drilling Equipment
Gas gathering and processing:
Number of drilling rigs removed from service | rig												31
Gas Gathering and Processing Equipment
Gas gathering and processing:
Number of gas gathering systems impaired | systems										3		3

[1] In 2015 and 2014, we incurred non-cash ceiling test write-downs of our oil and natural gas properties of $1.6 billion and $76.7 million pre-tax ($1.0 billion and $47.7 million, net of tax), respectively.

[2] Impairment for contract drilling equipment for 2015 includes a $8.3 million pre-tax write-down and 2014 includes a $74.3 million pre-tax write-down for 31 drilling rigs, some older top drives, and certain drill pipe removed from service.

[3] Impairment for gas gathering and processing systems for 2015 includes a $27.0 million pre-tax write-down for three of our systems, Bruceton Mills, Midwell, and Spring Creek. For 2014, it includes a $7.1 million pre-tax write-down for three of our systems, Weatherford, Billy Rose, and Spring Creek.

[4] Operating income (loss) is total operating revenues less operating expenses, depreciation, depletion, amortization, and impairment and does not include general corporate expenses, gain (loss) on disposition of assets, gain (loss) on non-designated hedges and hedge ineffectiveness, net, interest expense, other income (loss), or income taxes.

[5] Identifiable assets are those used in Unit’s operations in each industry segment. Corporate assets are principally cash and cash equivalents, short-term investments, corporate leasehold improvements, furniture, and equipment.

[6] In 2014, we entered into capital leases for $28.2 million

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Selected Quarterly Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended												12 Months Ended
		Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014		Sep. 30, 2014		Jun. 30, 2014		Mar. 31, 2014		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenues		$ 172,292	$ 212,393	$ 214,447	$ 255,099	$ 378,551		$ 400,974		$ 405,431		$ 387,988		$ 854,231	$ 1,572,944	$ 1,351,850
Gross profit (loss)	[1]	(492,636)	(314,409)	(419,666)	(389,451)	(89,796)		103,983		113,973		115,143
Net income (loss)		$ (309,337)	$ (205,281)	$ (274,389)	$ (248,354)	$ (42,551)		$ 67,522		$ 54,360		$ 56,945		$ (1,037,361)	$ 136,276	$ 184,746
Net income (loss) per common share:
Basic		$ (6.29)	$ (4.18)	$ (5.58)	$ (5.07)	$ (0.88)		$ 1.39		$ 1.12		$ 1.17		$ (21.12)	$ 2.80	$ 3.83
Diluted		$ (6.29)	$ (4.18)	$ (5.58)	$ (5.07)	$ (0.88)	[2]	$ 1.37	[2]	$ 1.11	[2]	$ 1.17	[2]	$ (21.12)	$ 2.78	$ 3.80

[1] Gross profit (loss) excludes general and administrative expense, interest expense, (gain) loss on disposition of assets, gain (loss) on non-designated hedges and hedge ineffectiveness, net, income taxes, and other income (loss).

[2] Due to the effect of the loss in the fourth quarter, the diluted earnings per share for the year's four quarters does not equal annual earnings per share.

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Supplemental Oil And Gas Disclosures (Schedule Of Capitalized Costs And Costs Incurred On Oil And Gas Properties) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Capitalized costs:
Proved properties	$ 5,401,618	$ 4,990,753	$ 4,235,712
Unproved properties not being amortized	337,099	485,568	545,588
Capitalized costs gross	5,738,717	5,476,321	4,781,300
Accumulated depreciation, depletion, amortization, and impairment	(4,631,404)	(2,786,678)	(2,439,458)
Net capitalized costs	1,107,313	2,689,643	2,341,842
Costs incurred:
Unproved properties acquired	41,777	76,041	76,304
Proved properties acquired	179	5,723	0
Exploration	19,222	68,811	33,373
Development	208,845	615,252	424,314
Asset retirement obligation	(5,693)	(37,687)	(17,951)
Total costs incurred	$ 264,330	$ 728,140	$ 516,040

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Supplemental Oil And Gas Disclosures (Schedule Of The Oil And Natural Gas Property Costs Not Being Amortized) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Unproved properties acquired and wells in progress	$ 337,099	$ 485,568	$ 545,588
2015
Unproved properties acquired and wells in progress	49,283
2014
Unproved properties acquired and wells in progress	65,970
2013
Unproved properties acquired and wells in progress	44,607
2012 and prior
Unproved properties acquired and wells in progress	$ 177,239

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Supplemental Oil And Gas Disclosures (Results Of Operations For Producing Activities) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Supplemental Oil and Gas Disclosures [Abstract]
Revenues	$ 371,335	$ 723,566	$ 633,792
Production costs	(152,560)	(165,315)	(162,822)
Depreciation, depletion, amortization, and impairment	(1,844,726)	(347,220)	(222,672)
Results of operations, income before income taxes	(1,625,951)	211,031	248,298
Income tax (expense) benefit	612,496	(82,028)	(96,091)
Results of operations for producing activities (excluding corporate overhead and financing costs)	$ (1,013,455)	$ 129,003	$ 152,207

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Supplemental Oil And Gas Disclosures (Schedule Of Proved Developed And Undeveloped Oil And Gas Reserve Quantities) (Details) bbl in Thousands, Mcf in Thousands		12 Months Ended
		Dec. 31, 2015 bbl Mcf	Dec. 31, 2014 bbl Mcf	Dec. 31, 2013 bbl Mcf
Oil (bbls)
Proved developed and undeveloped reserves:
Beginning of year		22,667	21,765	21,998
Revision of previous estimates	[1]	(3,954)	(3,174)	(2,113)
Extensions and discoveries		1,208	5,327	4,678
Infill reserves in existing proved fields		670	2,775	2,299
Purchases of minerals in place		0	236	0
Production		(3,783)	(3,844)	(3,360)
Sales		(73)	(418)	(1,737)
End of year		16,735	22,667	21,765
Proved developed reserves:
Beginning of year		17,448	15,594	16,441
End of year		14,679	17,448	15,594
Proved undeveloped reserves
Beginning of year		5,219	6,171	5,557
End of year		2,056	5,219	6,171
Natural Gas Liquids (bbls)
Proved developed and undeveloped reserves:
Beginning of year		48,529	41,205	35,166
Revision of previous estimates	[1]	(9,367)	(2,266)	836
Extensions and discoveries		1,948	10,850	7,273
Infill reserves in existing proved fields		1,861	3,577	1,945
Purchases of minerals in place		0	88	0
Production		(5,274)	(4,629)	(3,914)
Sales		(10)	(296)	(101)
End of year		37,687	48,529	41,205
Proved developed reserves:
Beginning of year		35,850	30,437	25,657
End of year		31,218	35,850	30,437
Proved undeveloped reserves
Beginning of year		12,679	10,768	9,509
End of year		6,469	12,679	10,768
Natural gas (Mcf)
Proved developed and undeveloped reserves:
Beginning of year | Mcf		646,961	581,784	555,647
Revision of previous estimates | Mcf	[1]	(139,514)	(32,790)	2,421
Extensions and discoveries | Mcf		20,974	113,541	68,611
Infill reserves in existing proved fields | Mcf		22,641	47,189	21,573
Purchases of minerals in place | Mcf		0	368	11
Production | Mcf		(65,546)	(58,854)	(56,757)
Sales | Mcf		(648)	(4,277)	(9,722)
End of year | Mcf		484,868	646,961	581,784
Proved developed reserves:
Beginning of year | Mcf		500,950	464,234	452,844
End of year | Mcf		416,395	500,950	464,234
Proved undeveloped reserves
Beginning of year | Mcf		146,011	117,550	102,803
End of year | Mcf		68,473	146,011	117,550

[1] Natural gas revisions of previous estimates decreased primarily due to a decline in natural gas prices.

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Supplemental Oil And Gas Disclosures (Standardized Measure Of Discounted Future Cash Flows Relating To Proved Reserves Disclosure) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Net Cash Flows [Abstract]
Future cash flows	$ 2,475,898	$ 6,398,236	$ 5,573,119
Future production costs	(1,017,777)	(2,069,636)	(1,734,985)
Future development costs	(228,445)	(560,102)	(571,170)
Future income tax expenses	(230,544)	(1,228,533)	(1,044,608)
Future net cash flows	999,132	2,539,965	2,222,356
10% annual discount for estimated timing of cash flows	(409,646)	(1,104,221)	(996,380)
Standardized measure of discounted future net cash flows relating to proved oil, NGLs and natural gas reserves	$ 589,486	$ 1,435,744	$ 1,225,976	$ 1,079,956
Percentage of annual discount for estimated timing of cash flows	10.00%	10.00%	10.00%

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Supplemental Oil And Gas Disclosures (Schedule Of Principal Sources Of Changes In Standardized Measure Of Discounted Future Net Cash Flows) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reserve Quantities [Line Items]
Sales and transfers of oil and natural gas produced, net of production costs	$ (218,115)	$ (558,252)	$ (470,970)
Net changes in prices and production costs	(1,356,333)	(33,259)	188,826
Revisions in quantity estimates and changes in production timing	(213,945)	(135,125)	(10,650)
Extensions, discoveries, and improved recovery, less related costs	95,671	635,752	426,377
Changes in estimated future development costs	227,857	96,339	26,629
Previously estimated cost incurred during the period	59,117	164,430	96,457
Purchases of minerals in place	0	8,395	9
Sales of minerals in place	(3,338)	(19,135)	(43,435)
Accretion of discount	209,979	179,190	147,579
Net change in income taxes	562,838	(98,119)	(170,091)
Other-net	(209,989)	(30,448)	(44,711)
Net change	(846,258)	209,768	146,020
Beginning of year	1,435,744	1,225,976	1,079,956
End of year	$ 589,486	$ 1,435,744	$ 1,225,976

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Supplemental Oil And Gas Disclosures Supplemental Oil and Gas Disclosures (Narrative) (Details)	12 Months Ended
	Dec. 31, 2015 $ / Unit
Oil (bbls)
Average Sales Prices	50.28
Natural Gas Liquids (bbls)
Average Sales Prices	19.47
Natural gas (Mcf)
Average Sales Prices	2.59

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Schedule II - Valuation And Qualifying Accounts And Reserves (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Valuation and Qualifying Accounts [Abstract]
Balance at beginning of period	$ 5,039	$ 5,342	$ 5,343
Additions charged to costs and expenses	1,191	3,562	0
Deductions and net write-offs	(1,031)	(3,865)	(1)
Balance at end of period	$ 5,199	$ 5,039	$ 5,342