10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-Q

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

For the quarterly period ended June 30, 2018

OR

o 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 001-31539

SM ENERGY COMPANY

(Exact name of registrant as specified in its charter)

Delaware (State or other jurisdiction of incorporation or organization) 41-0518430 (I.R.S. Employer Identification No.)

1775 Sherman Street, Suite 1200, Denver, Colorado (Address of principal executive offices) 80203 (Zip Code)

(303) 861-8140

(Registrant’s telephone number, including area code)

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 þ No o

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 þ No o

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

Large accelerated filer þ	Accelerated filer o
Non-accelerated filer o   (Do not check if a smaller reporting company)	Smaller reporting company o
Emerging growth company o
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. o

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

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

As of July 25, 2018, the registrant had 112,137,582 shares of common stock, $0.01 par value, outstanding.

1

TABLE OF CONTENTS

			PAGE
PART I	FINANCIAL INFORMATION		3
	ITEM 1.	FINANCIAL STATEMENTS (unaudited)	3
		Condensed Consolidated Balance Sheets June 30, 2018, and December 31, 2017	3
		Condensed Consolidated Statements of Operations Three and Six Months Ended June 30, 2018, and 2017	4
		Condensed Consolidated Statements of Comprehensive Income (Loss) Three and Six Months Ended June 30, 2018, and 2017	5
		Condensed Consolidated Statements of Cash Flows Six Months Ended June 30, 2018, and 2017	6
		Notes to Condensed Consolidated Financial Statements	8
	ITEM 2.	MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS	27
	ITEM 3.	QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK (included within the content of Item 2)	45
	ITEM 4.	CONTROLS AND PROCEDURES	46
PART II	OTHER INFORMATION		47
	ITEM 1.	LEGAL PROCEEDINGS	47
	ITEM 1A.	RISK FACTORS	47
	ITEM 2.	UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS	47
	ITEM 6.	EXHIBITS	48

2

PART I. FINANCIAL INFORMATION

ITEM 1. FINANCIAL STATEMENTS

SM ENERGY COMPANY AND SUBSIDIARIES

CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED)

(in thousands, except share data)

	June 30, 2018			December 31, 2017
ASSETS
Current assets:
Cash and cash equivalents	$	615,906		$	313,943
Accounts receivable	178,682			160,154
Derivative assets	146,329			64,266
Prepaid expenses and other	14,293			10,752
Total current assets	955,210			549,115
Property and equipment (successful efforts method):
Proved oil and gas properties	6,372,956			6,139,379
Accumulated depletion, depreciation, and amortization	(3,041,653		)	(3,171,575		)
Unproved oil and gas properties	1,917,883			2,047,203
Wells in progress	361,238			321,347
Oil and gas properties held for sale, net	5,040			111,700
Other property and equipment, net of accumulated depreciation of $53,483 and $49,985, respectively	102,986			106,738
Total property and equipment, net	5,718,450			5,554,792
Noncurrent assets:
Derivative assets	31,151			40,362
Other noncurrent assets	31,674			32,507
Total noncurrent assets	62,825			72,869
Total assets	$	6,736,485		$	6,176,776
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
Accounts payable and accrued expenses	$	446,318		$	386,630
Current portion of Senior Notes, net of unamortized deferred financing costs (note 5)	342,301			—
Derivative liabilities	259,338			172,582
Total current liabilities	1,047,957			559,212
Noncurrent liabilities:
Revolving credit facility	—			—
Noncurrent portion of Senior Notes, net of unamortized deferred financing costs	2,429,994			2,769,663
Senior Convertible Notes, net of unamortized discount and deferred financing costs	143,430			139,107
Asset retirement obligations	87,279			103,026
Asset retirement obligations associated with oil and gas properties held for sale	—			11,369
Deferred income taxes	177,709			79,989
Derivative liabilities	67,583			71,402
Other noncurrent liabilities	45,906			48,400
Total noncurrent liabilities	2,951,901			3,222,956
Commitments and contingencies (note 6)
Stockholders’ equity:
Common stock, $0.01 par value - authorized: 200,000,000 shares; issued and outstanding: 111,846,998 and 111,687,016 shares, respectively	1,118			1,117
Additional paid-in capital	1,754,169			1,741,623
Retained earnings (1)	997,641			665,657
Accumulated other comprehensive loss (1)	(16,301		)	(13,789		)
Total stockholders’ equity	2,736,627			2,394,608
Total liabilities and stockholders’ equity	$	6,736,485		$	6,176,776

____________________________________________

⁽¹⁾ The Company reclassified $3.0 million of tax effects stranded in accumulated other comprehensive loss to retained earnings as of January 1, 2018. Please refer to Note 1 - Summary of Significant Accounting Policies for further detail.

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

3

SM ENERGY COMPANY AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED)

(in thousands, except per share data)

	For the Three Months Ended   June 30,						For the Six Months Ended   June 30,
	2018			2017			2018			2017
				(as adjusted)						(as adjusted)
Operating revenues and other income:
Oil, gas, and NGL production revenue	$	402,558		$	284,939		$	785,444		$	618,137
Net gain (loss) on divestiture activity	39,501			(167,133		)	424,870			(129,670		)
Other operating revenues	1,857			2,915			3,197			4,992
Total operating revenues and other income	443,916			120,721			1,213,511			493,459
Operating expenses:
Oil, gas, and NGL production expense	117,400			124,376			238,279			262,422
Depletion, depreciation, amortization, and asset retirement obligation liability accretion	151,765			153,232			282,238			291,044
Exploration	14,056			12,983			27,783			24,800
Abandonment and impairment of unproved properties	11,935			157			17,560			157
General and administrative	28,920			28,237			56,602			57,054
Net derivative (gain) loss	63,749			(55,189		)	71,278			(169,963		)
Other operating expenses, net	(57		)	4,251			4,555			9,110
Total operating expenses	387,768			268,047			698,295			474,624
Income (loss) from operations	56,148			(147,326		)	515,216			18,835
Interest expense	(41,654		)	(44,595		)	(84,739		)	(91,548		)
Loss on extinguishment of debt	—			—			—			(35		)
Other non-operating income, net	1,802			953			2,211			720
Income (loss) before income taxes	16,296			(190,968		)	432,688			(72,028		)
Income tax (expense) benefit	901			71,061			(98,090		)	26,555
Net income (loss)	$	17,197		$	(119,907	)	$	334,598		$	(45,473	)
Basic weighted-average common shares outstanding	111,701			111,277			111,698			111,274
Diluted weighted-average common shares outstanding	113,630			111,277			113,267			111,274
Basic net income (loss) per common share	$	0.15		$	(1.08	)	$	3.00		$	(0.41	)
Diluted net income (loss) per common share	$	0.15		$	(1.08	)	$	2.95		$	(0.41	)
Dividends per common share	$	—		$	—		$	0.05		$	0.05

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

4

SM ENERGY COMPANY AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (UNAUDITED)

(in thousands)

	For the Three Months Ended   June 30,					For the Six Months Ended   June 30,
	2018		2017			2018		2017
Net income (loss)	$	17,197	$	(119,907	)	$	334,598	$	(45,473	)
Other comprehensive income (loss), net of tax:
Pension liability adjustment	198		124			458		(443		)
Total other comprehensive income (loss), net of tax	198		124			458		(443		)
Total comprehensive income (loss)	$	17,395	$	(119,783	)	$	335,056	$	(45,916	)

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

5

SM ENERGY COMPANY AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED)

(in thousands)

	For the Six Months Ended   June 30,
	2018			2017
				(as adjusted)
Cash flows from operating activities:
Net income (loss)	$	334,598		$	(45,473	)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Net (gain) loss on divestiture activity	(424,870		)	129,670
Depletion, depreciation, amortization, and asset retirement obligation liability accretion	282,238			291,044
Abandonment and impairment of unproved properties	17,560			157
Stock-based compensation expense	10,676			9,813
Net derivative (gain) loss	71,278			(169,963		)
Derivative settlement gain (loss)	(61,193		)	16,310
Amortization of debt discount and deferred financing costs	7,750			8,679
Loss on extinguishment of debt	—			35
Deferred income taxes	97,505			(30,790		)
Other, net	(2,302		)	4,464
Net change in working capital	(21,722		)	28,182
Net cash provided by operating activities	311,518			242,128
Cash flows from investing activities:
Net proceeds from the sale of oil and gas properties	742,215			766,247
Capital expenditures	(723,319		)	(366,743		)
Acquisition of proved and unproved oil and gas properties	(24,615		)	(88,140		)
Net cash provided by (used in) investing activities	(5,719		)	311,364
Cash flows from financing activities:
Proceeds from credit facility	—			406,000
Repayment of credit facility	—			(406,000		)
Cash paid to repurchase Senior Notes	—			(2,344		)
Cash paid for extinguishment of debt	—			(13		)
Net proceeds from sale of common stock	1,881			1,738
Dividends paid	(5,584		)	(5,563		)
Other, net	(133		)	(161		)
Net cash used in financing activities	(3,836		)	(6,343		)
Net change in cash, cash equivalents, and restricted cash (1)	301,963			547,149
Cash, cash equivalents, and restricted cash at beginning of period (1)	313,943			12,372
Cash, cash equivalents, and restricted cash at end of period (1)	$	615,906		$	559,521

____________________________________________

⁽¹⁾  Refer to Note 1 - Summary of Significant Accounting Policiesfor a reconciliation of cash, cash equivalents, and restricted cash reported to the amounts reported within the accompanying unaudited condensed consolidated balance sheets (“accompanying balance sheets”).

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

6

SM ENERGY COMPANY AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (Continued)

(in thousands)

Supplemental schedule of additional cash flow information and non-cash activities:

	For the Six Months Ended   June 30,
	2018			2017
				(as adjusted)
Operating activities:
Cash paid for interest, net of capitalized interest	$	(77,803	)	$	(83,493	)
Net cash (paid) refunded for income taxes	$	207		$	(8,220	)
Investing activities:
Changes in capital expenditure accruals and other	$	62,167		$	44,770
Supplemental non-cash investing activities:
Carrying value of properties exchanged	$	—		$	279,750
Supplemental non-cash financing activities:
Non-cash loss on extinguishment of debt, net	$	—		$	22

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

7

SM ENERGY COMPANY AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

Note 1 - Summary of Significant Accounting Policies

Description of Operations

SM Energy Company, together with its consolidated subsidiaries (“SM Energy” or the “Company”), is an independent energy company engaged in the acquisition, exploration, development, and production of crude oil and condensate, natural gas, and natural gas liquids (also respectively referred to as “oil,” “gas,” and “NGLs” throughout this report) in onshore North America.

Basis of Presentation

The accompanying unaudited condensed consolidated financial statements include the accounts of SM Energy and have been prepared in accordance with accounting principles generally accepted in the United States (“GAAP”) for interim financial information, the instructions to Quarterly Report on Form 10-Q, and Regulation S-X. These financial statements do not include all information and notes required by GAAP for annual financial statements. However, except as disclosed herein, there has been no material change in the information disclosed in the notes to the consolidated financial statements included in SM Energy’s Annual Report on Form 10-K for the year ended December 31, 2017 (the “2017 Form 10-K”). In the opinion of management, all adjustments, consisting of normal recurring adjustments considered necessary for a fair presentation of interim financial information, have been included. Operating results for the periods presented are not necessarily indicative of expected results for the full year. In connection with the preparation of the Company’s unaudited condensed consolidated financial statements, the Company evaluated events subsequent to the balance sheet date of June 30, 2018, and through the filing of this report. Certain prior period amounts have been reclassified to conform to the current presentation on the accompanying unaudited condensed consolidated financial statements.

Correction of Immaterial Errors

The accompanying unaudited condensed consolidated financial statements for the three months ended June 30, 2018, include non-cash adjustments that relate to the prior quarter.  For the three months ended June 30, 2018, the net gain (loss) on divestiture activity line item on the accompanying unaudited condensed consolidated statements of operations (“accompanying statements of operations”) includes $17.7 million of loss (approximately $13.7 million, net of tax) that should have been included in the estimated non-cash write down to fair value less selling costs recorded as of March 31, 2018, for the Divide County, North Dakota assets held for sale.  Additionally, for the three months ended June 30, 2018, the depletion, depreciation, amortization, and asset retirement obligation liability accretion expense line item on the accompanying statements of operations includes $6.7 million of additional expense (approximately $5.2 million, net of tax) that should have been recognized during the first quarter of 2018. Aggregated, these non-cash adjustments resulted in reported net income for the three months ended March 31, 2018, to be overstated by approximately $18.9 million (net of tax) with the corrections being recorded during the three months ended June 30, 2018, resulting in net income for the three months ended June 30, 2018, to be understated by approximately $18.9 million (net of tax). These non-cash adjustments are not deemed material with respect to the first or second quarters of 2018, or the anticipated results for fiscal year 2018. Further, these non-cash adjustments do not have an impact on the unaudited condensed consolidated financial statements for the six months ended June 30, 2018.

Significant Accounting Policies

The significant accounting policies followed by the Company are set forth in Note 1 - Summary of Significant Accounting Policies to the 2017 Form 10-K, and are supplemented by the notes to the unaudited condensed consolidated financial statements included in this report. These unaudited condensed consolidated financial statements should be read in conjunction with the 2017 Form 10-K.

Recently Issued Accounting Standards

Effective December 31, 2017, the Company early adopted, on a retrospective basis, Financial Accounting Standards Board (“FASB”) Accounting Standards Update (“ASU”) No. 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments (“ASU 2016-15”) and FASB ASU No. 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash (“ASU 2016-18”). ASU 2016-15 is intended to reduce diversity in practice in how certain transactions are classified in the statement of cash flows and ASU 2016-18 is intended to clarify guidance on the classification and presentation of restricted cash and restricted cash equivalents in the statement of cash flows. Please refer to Note 1 - Summary of Significant Accounting Policies in the 2017 Form 10-K for more information.

8

The accompanying unaudited condensed consolidated statements of cash flows (“accompanying statements of cash flows”) line items that were adjusted as a result of the adoption of ASU 2016-15 and ASU 2016-18 for the six months ended June 30, 2017, are summarized as follows:

	For the Six Months Ended June 30, 2017
	As Reported			As Adjusted
	(in thousands)
Cash flows from operating activities:
Non-cash (gain) loss on extinguishment of debt, net	$	22		N/A
Loss on extinguishment of debt	N/A			$	35
Net cash provided by operating activities	$	242,115		$	242,128
Cash flows from investing activities:
Other, net	$	3,000		N/A
Net cash provided by (used in) investing activities	$	314,364		$	311,364
Cash flows from financing activities:
Cash paid for extinguishment of debt	N/A			$	(13	)
Net cash used in financing activities	$	(6,330	)	$	(6,343	)
Net change in cash and cash equivalents	$	550,149		N/A
Net change in cash, cash equivalents, and restricted cash	N/A			$	547,149
Cash and cash equivalents at beginning of period	$	9,372		N/A
Cash, cash equivalents, and restricted cash at beginning of period	N/A			$	12,372
Cash and cash equivalents at end of period	$	559,521		N/A
Cash, cash equivalents, and restricted cash at end of period	N/A			$	559,521

The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the accompanying balance sheets:

	As of June 30, 2018		As of December 31, 2017
	(in thousands)
Cash and cash equivalents	$	615,906	$	313,943
Restricted cash	—		—
Total cash, cash equivalents, and restricted cash	$	615,906	$	313,943

Effective January 1, 2018, the Company adopted FASB ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606) and all related ASUs (“ASU 2014-09”). Under the new guidance, revenue is recognized when a customer obtains control of promised goods or services in an amount that reflects the consideration the entity expects to receive in exchange for those goods or services. The Company adopted ASU 2014-09 using the modified retrospective transition method, which was applied to all active contracts as of the effective date. The adoption of ASU 2014-09 did not result in a change to current or prior period results nor did it result in a material change to the Company’s business processes, systems, or controls. However, upon adopting ASU 2014-09, the Company expanded its disclosures to comply with the expanded disclosure requirements of ASU 2014-09. Please refer to Note 2 - Revenue from Contracts with Customers for additional discussion.

Effective January 1, 2018, the Company adopted FASB ASU No. 2017-07, Compensation-Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost (“ASU 2017-07”). ASU 2017-07 requires presentation of service cost in the same line item(s) as other compensation costs arising from services rendered by employees during the period and presentation of the remaining components of net benefit cost in a separate line item, outside of operating items, which the Company adopted with retrospective application. In addition, only the service component of the net benefit cost is eligible for capitalization, which the Company adopted with prospective application. Please refer to Note 1 - Summary of Significant Accounting Policies in the 2017 Form 10-K for more information.

9

The accompanying statements of operations line items that were adjusted as a result of the adoption of ASU 2017-07 for the three and six months ended June 30, 2017, are summarized as follows:

	For the Three Months Ended June 30, 2017						For the Six Months Ended June 30, 2017
	As Reported			As Adjusted			As Reported		As Adjusted
	(in thousands)
Operating expenses:
Exploration	$	13,072		$	12,983		$	25,050	$	24,800
General and administrative	$	28,460		$	28,237		$	57,684	$	57,054
Total operating expenses	$	268,359		$	268,047		$	475,504	$	474,624
Income (loss) from operations	$	(147,638	)	$	(147,326	)	$	17,955	$	18,835
Other non-operating income, net	$	1,265		$	953		$	1,600	$	720

Effective January 1, 2018, the Company early adopted ASU No. 2018-02, Income Statement-Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income (“ASU 2018-02”) by applying the changes in the period of adoption. ASU 2018-02 permits entities to reclassify tax effects stranded in accumulated other comprehensive income (loss) to retained earnings as a result of the enactment into law on December 22, 2017, of H.R.1, formally the Tax Cuts and Jobs Act (the “2017 Tax Act”). As a result of adopting ASU 2018-02, the Company reclassified $3.0 million of tax effects stranded in accumulated other comprehensive loss to retained earnings as of January 1, 2018. The Company’s policy for releasing income tax effects within accumulated other comprehensive loss is an incremental, unit-of-account approach.

In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) (“ASU 2016-02”), which requires recognition of right-of-use assets and lease payment liabilities on the balance sheet by lessees for virtually all leases currently classified as operating leases. The scope of ASU 2016-02 does not apply to leases used in the exploration or use of minerals, oil, natural gas, or other similar non-regenerative resources. Under ASU 2016-02, companies are permitted to make a policy election to not recognize lease assets or liabilities when the term of the lease is less than twelve months. For agreements that contain both lease and non-lease components, companies are also permitted to make a policy election to combine both the lease and non-lease components together and account for these arrangements as a single lease. The Company has established a cross-functional project team and is leveraging external consultants to evaluate the impacts of ASU 2016-02, which includes an analysis of non-cancelable leases, drilling rig contracts, certain midstream agreements, and other existing arrangements that may contain a lease component. Further, the Company is also evaluating policies, controls, and processes that will be necessary to support the additional accounting and disclosure requirements. The Company is also in the process of designing and implementing a lease administration system that will support the on-going maintenance and accounting for leases after adoption. The Company will adopt ASU 2016-02 on January 1, 2019, and plans on using the modified retrospective approach. Adoption of this guidance is expected to result in an increase in right-of-use assets and related liabilities on the Company’s consolidated balance sheets; however, the full impact to the Company’s financial statements and related disclosures is still being evaluated.

In January 2018, the FASB issued ASU No. 2018-01, Leases (Topic 842): Land Easement Practical Expedient for Transition to Topic 842 (“ASU 2018-01”), which provides an optional transitional practical expedient that allows entities to exclude from evaluation land easements that existed or expired before adoption of ASU 2016-02. Companies that elect this practical expedient will need to evaluate new or modified land easements after adopting ASU 2016-02. If this practical expedient is not elected, companies will need to evaluate all existing or expired land easements as part of the overall adoption of ASU 2016-02. The Company expects to elect to use this practical expedient as outlined in ASU 2018-01 and will adopt ASU 2018-01 at the same time it adopts ASU 2016-02.

In July 2018, the FASB issued ASU No. 2018-11, Leases (Topic 842): Targeted Improvements (“ASU 2018-11”). ASU 2018-11 provides an additional transition method for adopting ASU 2016-02, as well as provides lessors with a practical expedient when applying ASU 2016-02 to certain leases. The Company is currently evaluating ASU 2018-11 as part of its overall assessment of ASU 2016-02, and will adopt ASU 2018-11 at the same time it adopts ASU 2016-02.

Other than as disclosed above or in the 2017 Form 10-K, there are no other ASUs applicable to the Company that would have a material effect on the Company’s consolidated financial statements and related disclosures that have been issued but not yet adopted by the Company as of June 30, 2018, and through the filing of this report.

10

Note 2 - Revenue from Contracts with Customers

The Company recognizes its share of revenue from the sale of produced oil, gas, and NGLs in its Permian, South Texas & Gulf Coast, and Rocky Mountain regions. During the first quarter of 2018, the Company entered into two definitive agreements to sell all of its producing properties in its Rocky Mountain region. One transaction closed in the first quarter of 2018, and the second transaction closed in the second quarter of 2018. As a result of these divestitures, the Company does not expect any additional production revenue from the Rocky Mountain region after the second quarter of 2018. Please refer to Note 3 - Divestitures, Assets Held for Sale, and Acquisitions for additional detail. Oil, gas, and NGL production revenue presented within the accompanying statements of operations is reflective of the revenue generated from contracts with customers.

The tables below present the disaggregation of oil, gas, and NGL production revenue by product type for each of the Company’s operating regions for the three and six months ended June 30, 2018, and 2017:

	Permian						South Texas & Gulf Coast						Rocky Mountain						Total
	Three Months Ended June 30,						Three Months Ended June 30,						Three Months Ended June 30,						Three Months Ended June 30,
	2018			2017			2018			2017			2018			2017			2018			2017
	(in thousands)
Oil, gas, and NGL production revenue:
Oil production revenue	$	227,636		$	78,554		$	19,346		$	13,072		$	19,168		$	37,248		$	266,150		$	128,874
Gas production revenue	31,734			12,937			52,235			87,760			95			1,043			84,064			101,740
NGL production revenue	129			107			52,248			53,558			(33		)	660			52,344			54,325
Total	$	259,499		$	91,598		$	123,829		$	154,390		$	19,230		$	38,951		$	402,558		$	284,939
Relative percentage	64		%	32		%	31		%	54		%	5		%	14		%	100		%	100		%

____________________________________________

Note: Amounts may not calculate due to rounding.

	Permian						South Texas & Gulf Coast						Rocky Mountain						Total
	Six Months Ended June 30,						Six Months Ended June 30,						Six Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017			2018			2017			2018			2017
	(in thousands)
Oil, gas, and NGL production revenue:
Oil production revenue	$	433,430		$	160,053		$	38,929		$	51,936		$	54,851		$	84,509		$	527,210		$	296,498
Gas production revenue	56,611			24,246			104,968			175,961			1,594			2,714			163,173			202,921
NGL production revenue	253			254			94,018			116,915			790			1,549			95,061			118,718
Total	$	490,294		$	184,553		$	237,915		$	344,812		$	57,235		$	88,772		$	785,444		$	618,137
Relative percentage	63		%	30		%	30		%	56		%	7		%	14		%	100		%	100		%

____________________________________________

Note: Amounts may not calculate due to rounding.

11

The Company recognizes oil, gas, and NGL production revenue at the point in time when control of the product transfers to the customer, which differs depending on the contractual terms of each of the Company’s arrangements. Transfer of control drives the presentation of transportation, gathering, processing, and other post-production expenses (“fees and other deductions”) within the accompanying statements of operations. Fees and other deductions incurred prior to control transfer are recorded within the oil, gas, and NGL production expense line item on the accompanying statements of operations, while fees and other deductions incurred subsequent to control transfer are recorded as a reduction of oil, gas, and NGL production revenue. The Company has four general categories under which oil, gas, and NGL production revenue is generated. Each of the Company’s operating regions generate production revenue from a combination of some or all of the four different contract types summarized below:

1) The Company sells oil production at or near the wellhead and receives an agreed-upon index price from the purchaser, net of basis, quality, and transportation differentials. Under this arrangement, control transfers at or near the wellhead.

2) The Company sells unprocessed gas to a midstream processor at the wellhead or inlet of the midstream processing facility. The midstream processor gathers and processes the raw gas stream and remits proceeds to the Company from the ultimate sale of the processed NGLs and residue gas to third parties. In such arrangements, the midstream processor obtains control of the product at the wellhead or inlet and is considered the customer. Proceeds received for unprocessed gas under these arrangements are reflected as gas production revenue above and are recorded net of transportation and processing fees incurred by the midstream processor after control has transferred.

3) The Company has certain processing arrangements that include the delivery of unprocessed gas to the inlet of a midstream processor’s facility for processing. Upon completion of processing, the midstream processor purchases the NGLs and redelivers residue gas back to the Company in-kind. For the NGLs extracted during processing, the midstream processor remits payment to the Company based on the proceeds it generates from selling the NGLs to other third parties. For the residue gas taken in-kind, the Company has separate sales contracts where control transfers at points downstream of the processing facility. Given the structure of these arrangements and where control transfers, the Company separately recognizes gathering, transportation, and processing fees incurred prior to control transfer. These fees are recorded within the oil, gas, and NGL production expense line item on the accompanying statements of operations.

4) The Company has certain midstream processing arrangements where unprocessed gas is delivered to the inlet of the midstream processor’s facility for processing. Upon completion of processing, the midstream processor purchases the processed NGLs and residue gas and remits the proceeds to the Company from the sale of the products to third-party customers. In these arrangements, control transfers at the tailgate of the midstream processing facility for both products. Given the structure of these arrangements and where control transfers, the Company separately recognizes gathering, transportation, and processing fees incurred prior to control transfer. These fees are recorded within the oil, gas, and NGL production expense line item on the accompanying statements of operations.

Significant judgments made in applying the guidance in Accounting Standards Codification Topic 606, Revenue from Contracts with Customers relate to the point in time when control transfers to customers in gas processing arrangements with midstream processors. The Company does not believe that significant judgments are required with respect to the determination of the transaction price, including amounts that represent variable consideration, as volume and price carry a low level of estimation uncertainty given the precision of volumetric measurements and the use of index pricing with predictable differentials. Accordingly, the Company does not consider estimates of variable consideration to be constrained.

The Company’s contractual performance obligations arise upon the production of hydrocarbons from wells in which the Company has an ownership interest. The performance obligations are considered satisfied upon control transferring to a customer at the wellhead, inlet, or tailgate of the midstream processor’s processing facility, or other contractually specified delivery point. The time period between production and satisfaction of performance obligations is generally less than one day; thus, there are no material unsatisfied or partially unsatisfied performance obligations at the end of the reporting period.

Revenue is recorded in the month when contractual performance obligations are satisfied. However, settlement statements from the purchasers of hydrocarbons and the related cash consideration are generally received 30 to 90 days after production has occurred. As a result, the Company must estimate the amount of production delivered to the customer and the consideration that will ultimately be received for sale of the product. Estimated revenue due to the Company is recorded within accounts receivable on the accompanying balance sheets until payment is received. The accounts receivable balances from contracts with customers within the accompanying balance sheets as of June 30, 2018, and December 31, 2017, were $115.0 million and $96.6 million, respectively. To estimate accounts receivable from contracts with customers, the Company uses knowledge of its properties, historical performance, contractual arrangements, pricing, quality and transportation differentials, and other factors as the basis for these estimates. Differences between estimates and actual amounts received for product sales are recorded in the month that payment is received from the purchaser. Revenue recognized for the three and six months ended June 30, 2018, that related to performance obligations satisfied in prior reporting periods was immaterial.

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Note 3 - Divestitures, Assets Held for Sale, and Acquisitions

Divestitures

On March 26, 2018,the Company divested approximately 112,000 net acres of its Powder River Basin assets (the “PRB Divestiture”), for total cash received at closing, net of costs (referred to throughout this report as “net divestiture proceeds”), of $490.8 million, subject to final purchase price adjustments, and recorded an estimated net gain of $410.1 million for the six months endedJune 30, 2018.

During the second quarter of 2018, the Company completed the divestitures of its remaining assets in the Williston Basin located in Divide County, North Dakota (the “Divide County Divestiture”) and its Halff East assets in the Midland Basin (the “Halff East Divestiture”), for combined net divestiture proceeds received at closing of $250.8 million, subject to final purchase price adjustments, and recorded a combined estimated net gain of $15.7 million for the six months endedJune 30, 2018. Please refer to Note 1 - Summary of Significant Accounting Policiesfor a discussion of an immaterial non-cash adjustment related to the Divide County Divestiture that was recorded in the second quarter of 2018.

The following table presents loss before income taxes from the Divide County, North Dakota assets sold for the three and six months ended June 30, 2018, and 2017. The Divide County Divestiture was considered a disposal of a significant asset group.

	For the Three Months Ended June 30,						For the Six Months Ended June 30,
	2018			2017			2018			2017
	(in thousands)
Loss before income taxes (1)	$	(17,478	)	$	(153,442	)	$	(28,975	)	$	(486,161	)

____________________________________________

⁽¹⁾  Loss before income taxes reflects oil, gas, and NGL production revenue, less oil, gas, and NGL production expense, depletion, depreciation, amortization, and asset retirement obligation liability accretion expense, impairment expense, and net loss on divestiture activity.

On March 10, 2017,the Company closed the divestiture of its outside-operated Eagle Ford shale assets, including its ownership interest in related midstream assets, for net divestiture proceeds received at closing of $747.4 million, and net divestiture proceeds of $744.1 million after final purchase price adjustments. The Company recorded an estimated net gain of $397.4 million for the six months ended June 30, 2017, and a final net gain of $396.8 million related to these divested assets for the year ended December 31, 2017. During the second quarter of 2017, the Company divested of assets located in Williams County, North Dakota, for net divestiture proceeds of $24.6 million.

Assets Held for Sale

Assets are classified as held for sale when the Company commits to a plan to sell the assets and it is probable the sale will take place within one year. Upon classification as held for sale, long-lived assets are no longer depreciated or depleted, and a measurement for impairment is performed to identify and expense any excess of carrying value over fair value less estimated costs to sell. When assets no longer meet the criteria of assets held for sale, they are measured at the lower of the carrying value of the assets before being classified as held for sale, adjusted for any depletion, depreciation, and amortization expense that would have been recognized, or the fair value at the date they are reclassified to assets held for use. Any gain or loss recognized on assets held for sale or on assets held for sale that are subsequently reclassified to assets held for use is reflected in the net gain (loss) on divestiture activity line item on the accompanying statements of operations. As of June 30, 2018, there were $5.0 million of assets held for sale presented on the accompanying balance sheets.

During the second quarter of 2017, the Company reclassified its retained Divide County assets previously held for sale to assets held for use. A $359.6 million write-down was recorded on these assets in the first quarter of 2017 based on the estimated fair value less selling costs as of March 31, 2017. An additional $166.9 million write-down was recorded in the second quarter of 2017 based on market conditions that existed on the date the Company made its decision to retain these assets.

Acquisitions

During the second quarter of 2018, the Company acquired approximately 720 net acres of unproved properties in Martin County, Texas, for $24.6 million. Under authoritative accounting guidance, this transaction was considered an asset acquisition. Therefore, the properties were recorded based on the fair value of the total consideration transferred on the acquisition date and the transaction costs were capitalized as a component of the cost of the assets acquired. During the first half of 2017, the Company

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acquired approximately 3,400 net acres of primarily unproved properties in Howard and Martin Counties, Texas, in multiple transactions for a total of $72.3 million of cash consideration, which were accounted for as asset acquisitions.

Also, during the first half of 2017, the Company completed several non-monetary acreage trades of primarily unproved properties in Howard and Martin Counties, Texas, resulting in the Company acquiring approximately 6,550 net acres in exchange for approximately 5,700 net acres, with $279.8 million of carrying value attributed to the properties surrendered by the Company in such trades. These trades were recorded at carryover basis with no gain or loss recognized.

Note 4 - Income Taxes

The income tax (expense) benefit recorded for the three and six months ended June 30, 2018, and 2017, differs from the amounts that would be provided by applying the statutory United States federal income tax rate to income or loss before income taxes primarily due to the effect of state income taxes, excess tax benefits and deficiencies from share-based payment awards, changes in valuation allowances, and accumulated impacts of other smaller permanent differences. The quarterly rate can also be affected by the proportional impacts of forecasted net income or loss as of each period end presented.

The provision for income taxes for the three and six months ended June 30, 2018, and 2017, consisted of the following:

	For the Three Months Ended   June 30,						For the Six Months Ended   June 30,
	2018			2017			2018			2017
	(in thousands)
Current portion of income tax (expense) benefit:
Federal	$	—		$	4,607		$	—		$	(2,832	)
State	40			2,439			(585		)	(1,403		)
Deferred portion of income tax (expense) benefit	861			64,015			(97,505		)	30,790
Income tax (expense) benefit	$	901		$	71,061		$	(98,090	)	$	26,555
Effective tax rate	(5.5		)%	37.2		%	22.7		%	36.9		%

The enactment of the 2017 Tax Act on December 22, 2017, reduced the Company’s federal tax rate for 2018 and future years from 35 percent to 21 percent. Although the Company believes it has properly analyzed the tax accounting impacts of the 2017 Tax Act, it will continue to monitor provisions with discrete rate impacts, such as the limitation on executive compensation for subsequent events and guidance within the one year measurement period. There are no new estimates or finalized income tax items associated with the 2017 Tax Act included in income tax expense for the three or six months endedJune 30, 2018.

On a year-to-date basis, a change in the Company’s effective tax rate between reporting periods will generally reflect differences in its estimated highest marginal state tax rate due to changes in the composition of income or loss from Company activities, including divestitures, among multiple state tax jurisdictions. For the three months ended June 30, 2018, the decrease in the effective tax rate year-over-year also reflects the cumulative effects of property divestitures in higher marginal rate states in 2018. Cumulative effects of state tax rate changes are reflected in the period legislation is enacted. Excess tax benefits and deficiencies from share-based payment awards impact the Company’s effective tax rate between periods.

In 2017, the Company re-evaluated various factors affecting deferred tax assets related to net operating losses and tax credits, and determined utilization would be appropriate. The change in the current portion of income tax (expense) benefit between periods reflects the effect of this determination. The Company is generally no longer subject to United States federal or state income tax examinations by tax authorities for years before 2013.

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Note 5 - Long-Term Debt

Credit Agreement

The Company’s Fifth Amended and Restated Credit Agreement, as amended, (the “Credit Agreement”) provides for a maximum loan amount of $2.5 billion and has a maturity date of December 10, 2019. On April 24, 2018, as part of the regular, semi-annual borrowing base redetermination process, the borrowing base and aggregate lender commitments were increased to $1.4 billion and $1.0 billion, respectively. Upon completion of the Divide County Divestiture on May 30, 2018, the Company’s borrowing base was reduced to $1.3 billion, while the aggregate lender commitments remained at $1.0 billion. Please refer to Note 3 - Divestitures, Assets Held for Sale, and Acquisitions for additional discussion on the sale of these assets. The next scheduled redetermination date is October 1, 2018.

The Company must comply with certain financial and non-financial covenants under the terms of the Credit Agreement and was in compliance with all such covenants as of June 30, 2018, and through the filing of this report.

Interest and commitment fees are accrued based on a borrowing base utilization grid set forth in the Credit Agreement as presented in Note 5 - Long-Term Debt in the 2017 Form 10-K.  Eurodollar loans accrue interest at the London Interbank Offered Rate, plus the applicable margin from the utilization grid, and Alternate Base Rate and swingline loans accrue interest at the prime rate, plus the applicable margin from the utilization grid.  Commitment fees are accrued on the unused portion of the aggregate lender commitment amount at rates from the utilization grid and are included in interest expense in the accompanying statements of operations.

The following table presents the outstanding balance, total amount of letters of credit outstanding, and available borrowing capacity under the Credit Agreement as of July 25, 2018, June 30, 2018, and December 31, 2017:

	As of July 25, 2018		As of June 30, 2018		As of December 31, 2017
	(in thousands)
Credit facility balance (1)	$	—	$	—	$	—
Letters of credit (2)	200		200		200
Available borrowing capacity	999,800		999,800		924,800
Total aggregate lender commitment amount	$	1,000,000	$	1,000,000	$	925,000

____________________________________________

⁽¹⁾  Unamortized deferred financing costs attributable to the credit facility are presented as a component of other noncurrent assets on the accompanying balance sheets and totaled $2.4 million and $3.1 million as of June 30, 2018, and December 31, 2017, respectively.

⁽²⁾  Letters of credit outstanding reduce the amount available under the credit facility on a dollar-for-dollar basis.

Senior Notes

The Company’s Senior Notes consist of 6.50% Senior Notes due 2021, 6.125% Senior Notes due 2022, 6.50% Senior Notes due 2023, 5.0% Senior Notes due 2024, 5.625% Senior Notes due 2025, and 6.75% Senior Notes due 2026 (collectively referred to as “Senior Notes”). On June 15, 2018, the Company called for redemption all of its 6.50% Senior Notes due 2021 (“2021 Senior Notes”) at a redemption price of 102.167% of the principal amount, plus accrued and unpaid interest on the principal amount of the 2021 Senior Notes to be redeemed (“2021 Senior Notes Redemption”). As a result of the 2021 Senior Notes Redemption, the 2021 Senior Notes, net of unamortized deferred financing costs, were classified as a current liability on the accompanying balance sheets as of June 30, 2018. On July 16, 2018, the Company completed the 2021 Senior Notes Redemption, which resulted in the payment of total consideration, including accrued interest, of $355.9 million. The Company will record a loss on extinguishment of debt of $9.8 million for the quarter ended September 30, 2018. This amount will include $7.5 million associated with the premium paid for the 2021 Senior Notes Redemption and $2.3 million related to the acceleration of unamortized deferred financing costs.

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The current portion of Senior Notes, net of unamortized deferred financing costs and noncurrent portion of Senior Notes, net of unamortized deferred financing costs lines on the accompanying balance sheets as of June 30, 2018, and December 31, 2017, consisted of the following:

	As of June 30, 2018						As of December 31, 2017
	Principal Amount		Unamortized Deferred Financing Costs		Senior Notes, Net of Unamortized Deferred Financing Costs		Principal Amount		Unamortized Deferred Financing Costs		Senior Notes, Net of Unamortized Deferred Financing Costs
	(in thousands)
6.50% Senior Notes due 2021	$	344,611	$	2,310	$	342,301	$	344,611	$	2,656	$	341,955
6.125% Senior Notes due 2022	561,796		5,211		556,585		561,796		5,800		555,996
6.50% Senior Notes due 2023	394,985		3,342		391,643		394,985		3,707		391,278
5.0% Senior Notes due 2024	500,000		5,149		494,851		500,000		5,610		494,390
5.625% Senior Notes due 2025	500,000		6,261		493,739		500,000		6,714		493,286
6.75% Senior Notes due 2026	500,000		6,824		493,176		500,000		7,242		492,758
Total	$	2,801,392	$	29,097	$	2,772,295	$	2,801,392	$	31,729	$	2,769,663

The Senior Notes are unsecured senior obligations and rank equal in right of payment with all of the Company’s existing and any future unsecured senior debt, and are senior in right of payment to any future subordinated debt. There are no subsidiary guarantors of the Senior Notes.  The Company is subject to certain covenants under the indentures governing the Senior Notes and was in compliance with all such covenants as of June 30, 2018, and through the filing of this report. The Company may redeem some or all of its Senior Notes prior to their maturity at redemption prices based on a premium, plus accrued and unpaid interest as described in the indentures governing the Senior Notes.

Senior Convertible Notes

The Company’s Senior Convertible Notes consist of $172.5 million in aggregate principal amount of 1.50% Senior Convertible Notes due July 1, 2021 (the “Senior Convertible Notes”). The Senior Convertible Notes are unsecured senior obligations and rank equal in right of payment with all of the Company’s existing and any future unsecured senior debt, and are senior in right of payment to any future subordinated debt. Please refer to Note 5 - Long-Term Debt in the 2017 Form 10-K for additional detail on the Company’s Senior Convertible Notes and associated capped call transactions.

The Senior Convertible Notes were not convertible at the option of holders as of June 30, 2018, or through the filing of this report. Notwithstanding the inability to convert, the if-converted value of the Senior Convertible Notes as of June 30, 2018, did not exceed the principal amount. The debt discount and debt-related issuance costs are amortized to the principal value of the Senior Convertible Notes as interest expense through the maturity date of July 1, 2021. Interest expense recognized on the Senior Convertible Notes related to the stated interest rate and amortization of the debt discount totaled $2.6 million and $2.5 million for the three months ended June 30, 2018, and 2017, respectively, and totaled $5.2 million and $4.9 million for the six months ended June 30, 2018, and 2017, respectively.

There have been no changes to the initial net carrying amount of the equity component of the Senior Convertible Notes recorded in additional paid-in capital on the accompanying balance sheets. The Senior Convertible Notes, net of unamortized discount and deferred financing costs line on the accompanying balance sheets as of June 30, 2018, and December 31, 2017, consisted of the following:

	As of June 30, 2018			As of December 31, 2017
	(in thousands)
Principal amount of Senior Convertible Notes	$	172,500		$	172,500
Unamortized debt discount	(26,319		)	(30,183		)
Unamortized deferred financing costs	(2,751		)	(3,210		)
Senior Convertible Notes, net of unamortized discount and deferred financing costs	$	143,430		$	139,107

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The Company is subject to certain covenants under the indenture governing the Senior Convertible Notes and was in compliance with all such covenants as of June 30, 2018, and through the filing of this report.

Note 6 - Commitments and Contingencies

Commitments

As of June 30, 2018, the Company had total gathering, processing, transportation throughput, and purchase commitments with various third parties that require delivery of a minimum quantity of 31 MMBbl of oil, 737 Bcf of gas, and 22 MMBbl of produced water through 2027 and a minimum purchase quantity of 7 MMBbl of water by 2022. If the Company fails to deliver or purchase any product, as applicable, the aggregate undiscounted future deficiency payments as of June 30, 2018, would total approximately $360.6 million. This amount does not include any costs that may be incurred for certain contracts where the Company cannot predict with accuracy the amount and timing of any payments that may be incurred for not meeting certain minimum commitments, as such payments are dependent upon the price of oil in effect at the time of settlement. Under certain of the Company’s commitment agreements, if the Company is unable to deliver the minimum quantity from its production, it may deliver production acquired from third parties. As of the filing of this report, the Company does not expect to incur any material shortfalls with regard to these commitments.

The Company entered into new and amended drilling rig and completion service contracts during the first six months of 2018 and subsequent to June 30, 2018. As of the filing of this report, the Company’s drilling rig and completion service contract commitments totaled $103.1 million; however, if the Company terminated these contracts immediately, it would incur penalties of $40.4 million.

Additionally, as of June 30, 2018, the Company had fixed price contracts with various third parties to purchase electricity through 2027 for a total of $30.8 million. As of the filing of this report, the Company expects to meet these purchase commitments.

There were no other material changes in commitments during the first six months of 2018. Please refer to Note 6 - Commitments and Contingencies in the 2017 Form 10-K for additional discussion of the Company’s commitments.

Contingencies

The Company is subject to litigation and claims arising in the ordinary course of business.  The Company accrues for such items when a liability is both probable and the amount can be reasonably estimated.  In the opinion of management, the results of any pending litigation and claims are not expected to have a material effect on the results of operations, the financial position, or the cash flows of the Company.

Note 7 - Compensation Plans

Equity Incentive Compensation Plan

As of June 30, 2018, 6.8 million shares of common stock were available for grant under the Company’s Equity Incentive Compensation Plan.

Performance Share Units

The Company grants performance share units (“PSUs”) to eligible employees as part of its long-term equity incentive compensation program. The number of shares of the Company’s common stock issued to settle PSUs ranges from zero to two times the number of PSUs awarded and is determined based on certain performance criteria over a three-year performance period. For PSUs that were granted in 2015, 2016, and 2017, the performance criteria is based on a combination of the Company’s annualized Total Shareholder Return (“TSR”) for the performance period and the relative performance of the Company’s TSR compared with the annualized TSR of certain peer companies for the performance period. Compensation expense for PSUs is recognized within general and administrative expense and exploration expense over the vesting periods of the respective awards.

Total compensation expense recorded for PSUs was $2.4 million and $1.7 million for the three months ended June 30, 2018, and 2017, respectively, and was $4.8 million and $4.2 million for the six months ended June 30, 2018, and 2017, respectively. As of June 30, 2018, there was $12.4 million of total unrecognized compensation expense related to non-vested PSU awards, which is being amortized through 2020. There were no material changes to the outstanding and non-vested PSUs during the six months ended June 30, 2018.

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Subsequent to June 30, 2018, the Company granted 572,924 PSUs with a fair value of $14.0 million (“2018 PSU Grant”). The fair value of the 2018 PSU Grant was measured at the grant date using a stochastic Monte Carlo simulation using geometric Brownian motion.  The number of shares of the Company’s common stock issued to settle the 2018 PSU Grant, after the completion of a three-year performance period, will range from zero to two times the number of PSUs granted on the award date, depending on the extent to which the Company has achieved certain performance criteria and to the extent the PSUs have vested. As outlined in the 2018 PSU Grant agreement, performance measurements affecting vesting are based on a combination of relative performance of the Company’s annualized TSR compared with the annualized TSR of certain peer companies over the three-year performance period, and relative performance of the Company’s debt adjusted per share cash flow growth (“DACFG”) compared with the DACFG of certain peer companies over the three-year performance period. In addition to these performance measures, the 2018 PSU Grant agreement also stipulates that if the Company’s annualized TSR is negative over the three-year performance period, the maximum number of shares of common stock that can be issued to settle outstanding PSUs is capped at one times the number of PSUs granted on the award date, regardless of the Company’s TSR and DACFG performance relative to its peers. Compensation expense associated with the 2018 PSU Grant will be evaluated on a quarterly basis and may be adjusted depending on the likelihood of achieving certain performance goals. The 2018 PSU Grant generally vests on the third anniversary of the date of the grant. Also, subsequent to June 30, 2018, the Company settled PSUs that were granted in 2015, with no shares issued upon settlement because the grant settled at a zero multiplier.

Employee Restricted Stock Units

The Company grants restricted stock units (“RSUs”) to eligible employees as part of its long-term equity incentive compensation program. Each RSU represents a right to receive one share of the Company’s common stock upon settlement of the award at the end of the specified vesting period. Compensation expense for RSUs is recognized within general and administrative expense and exploration expense over the vesting periods of the respective awards.

Total compensation expense recorded for employee RSUs was $2.3 million and $2.1 million for the three months ended June 30, 2018, and 2017, respectively, and was $5.0 million and $4.6 million for the six months ended June 30, 2018, and 2017, respectively. As of June 30, 2018, there was $12.8 million of total unrecognized compensation expense related to non-vested RSU awards, which is being amortized through 2020. There were no material changes to the outstanding and non-vested RSUs during the six months ended June 30, 2018.

Subsequent to June 30, 2018, the Company granted 534,770 RSUs with a fair value of $13.7 million. These RSUs generally vest one-third of the total grant on each of the next three anniversary dates of the grant. Also, subsequent to June 30, 2018, the Company settled 406,013 RSUs that related to awards granted in previous years. The Company and the majority of grant participants mutually agreed to net share settle a portion of the awards to cover income and payroll tax withholdings, as provided for in the plan document and award agreements. As a result, the Company issued 290,584 net shares of common stock upon settlement of the awards.

Director Shares

During the second quarter of 2018, the Company issued 58,572 shares of its common stock to its non-employee directors under the Company’s Equity Incentive Compensation Plan, which fully vest on December 31, 2018. During the second quarter of 2017, the Company issued 71,573 shares of its common stock to its non-employee directors and 8,794 RSUs to a non-employee director.

Employee Stock Purchase Plan

Under the Company’s Employee Stock Purchase Plan (“ESPP”), eligible employees may purchase shares of the Company’s common stock through payroll deductions of up to 15 percent of eligible compensation, without accruing in excess of $25,000 in value from purchases for each calendar year. The purchase price of the stock is 85 percent of the lower of the fair market value of the stock on either the first or last day of the purchase period. The ESPP is intended to qualify under Section 423 of the Internal Revenue Code. There were 100,249 and 123,678 shares issued under the ESPP during the second quarters of 2018, and 2017, respectively. Total proceeds to the Company for the issuance of these shares was $1.9 million and $1.7 million for the six months ended June 30, 2018, and 2017, respectively. The fair value of ESPP grants is measured at the date of grant using the Black-Scholes option-pricing model.

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Note 8 - Pension Benefits

Pension Plans

The Company has a non-contributory defined benefit pension plan covering employees who meet age and service requirements (the “Qualified Pension Plan”). The Company also has a supplemental non-contributory pension plan covering certain management employees (the “Nonqualified Pension Plan” and together with the Qualified Pension Plan, the “Pension Plans”). Effective as of January 1, 2016, the Company froze the Pension Plans to new participants, and employees eligible to participate in the Pension Plans prior to them being frozen will continue to earn benefits.

Components of Net Periodic Benefit Cost for the Pension Plans

The following table presents the components of the net periodic benefit cost for the Pension Plans:

	For the Three Months Ended   June 30,						For the Six Months Ended   June 30,
	2018			2017			2018			2017
	(in thousands)
Service cost	$	1,705		$	1,269		$	3,365		$	3,319
Interest cost	637			617			1,310			1,344
Expected return on plan assets that reduces periodic pension benefit cost	(370		)	(563		)	(931		)	(1,122		)
Amortization of prior service cost	5			5			9			9
Amortization of net actuarial loss	340			253			664			649
Net periodic benefit cost	$	2,317		$	1,581		$	4,417		$	4,199

Prior service costs are amortized on a straight-line basis over the average remaining service period of active participants. Gains and losses in excess of 10 percent of the greater of the benefit obligation or the market-related value of assets are amortized over the average remaining service period of active participants. As a result of the adoption of ASU 2017-07, the service cost component of net periodic benefit cost for the Pension Plans is presented as an operating expense within the general and administrative and exploration expense line items on the accompanying statements of operations while the other components of net periodic benefit cost for the Pension Plans are presented as non-operating expenses within the other non-operating income, net line item on the accompanying statements of operations. Please refer to Note 1 - Summary of Significant Accounting Policies for further detail.

Contributions

The Company contributed $6.1 million to the Qualified Pension Plan during the six months ended June 30, 2018.

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Note 9 - Earnings Per Share

Basic net income or loss per common share is calculated by dividing net income or loss available to common stockholders by the basic weighted-average number of common shares outstanding for the respective period. Diluted net income or loss per common share is calculated by dividing adjusted net income or loss by the diluted weighted-average number of common shares outstanding, which includes the effect of potentially dilutive securities. Potentially dilutive securities for this calculation consist primarily of non-vested RSUs, contingent PSUs, and shares into which the Senior Convertible Notes are convertible, which are measured using the treasury stock method. Shares of the Company’s common stock traded at an average closing price below the $40.50 conversion price for the three and six months ended June 30, 2018, and 2017, and therefore the Senior Convertible Notes had no dilutive impact. Please refer to Note 1 - Summary of Significant Accounting Policies in the 2017 Form 10-K for additional detail on these potentially dilutive securities.

When the Company recognizes a loss from continuing operations, all potentially dilutive shares are anti-dilutive and are consequently excluded from the calculation of diluted net loss per common share. The following table presents the weighted-average anti-dilutive securities for the periods presented:

	For the Three Months Ended   June 30,		For the Six Months Ended   June 30,
	2018	2017	2018	2017
	(in thousands)
Anti-dilutive	—	44	—	59

The following table sets forth the calculations of basic and diluted net income (loss) per common share:

	For the Three Months Ended   June 30,					For the Six Months Ended   June 30,
	2018		2017			2018		2017
	(in thousands, except per share data)
Net income (loss)	$	17,197	$	(119,907	)	$	334,598	$	(45,473	)
Basic weighted-average common shares outstanding	111,701		111,277			111,698		111,274
Dilutive effect of non-vested RSUs and contingent PSUs	1,929		—			1,569		—
Dilutive effect of Senior Convertible Notes	—		—			—		—
Diluted weighted-average common shares outstanding	113,630		111,277			113,267		111,274
Basic net income (loss) per common share	$	0.15	$	(1.08	)	$	3.00	$	(0.41	)
Diluted net income (loss) per common share	$	0.15	$	(1.08	)	$	2.95	$	(0.41	)

Note 10 - Derivative Financial Instruments

Summary of Oil, Gas, and NGL Derivative Contracts in Place

The Company has entered into various commodity derivative contracts to mitigate a portion of its exposure to potentially adverse market changes in commodity prices and the associated impact on cash flows. As of June 30, 2018, all derivative counterparties were members of the Company’s credit facility lender group and all contracts were entered into for other-than-trading purposes. The Company’s commodity derivative contracts consist of swap and collar arrangements for oil and gas production, and swap arrangements for NGL production. In a typical commodity swap agreement, if the agreed upon published third-party index price (“index price”) is lower than the swap fixed price, the Company receives the difference between the index price and the agreed upon swap fixed price. If the index price is higher than the swap fixed price, the Company pays the difference.  For collar arrangements, the Company receives the difference between an agreed upon index and the floor price if the index price is below the floor price. The Company pays the difference between the agreed upon ceiling price and the index price if the index price is above the ceiling price. No amounts are paid or received if the index price is between the floor and ceiling prices.

The Company has also entered into fixed price oil basis swaps in order to mitigate exposure to adverse pricing differentials between certain industry benchmark prices and the actual physical pricing points where the Company’s production volumes are sold. Currently, the Company has basis swap contracts with fixed price differentials between NYMEX WTI and WTI Midland for a portion

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of its Midland Basin production with sales contracts that settle at WTI Midland prices. The Company also has basis swaps with fixed price differentials between NYMEX WTI and Intercontinental Exchange Brent Crude (“ICE Brent”) for a portion of its Midland Basin oil production with sales contracts that settle at ICE Brent prices.

As of June 30, 2018, the Company had commodity derivative contracts outstanding as summarized in the tables below:

Oil Swaps

Contract Period	NYMEX WTI Volumes	Weighted-Average  Contract Price
	(MBbl)	(per Bbl)
Third quarter 2018	1,769	$	49.77
Fourth quarter 2018	1,894	$	49.87
2019	1,940	$	50.70
Total	5,603

Oil Collars

Contract Period	NYMEX WTI  Volumes	Weighted- Average Floor  Price		Weighted- Average Ceiling  Price
	(MBbl)	(per Bbl)		(per Bbl)
Third quarter 2018	1,948	$	50.00	$	58.61
Fourth quarter 2018	2,222	$	50.00	$	58.44
2019	10,055	$	50.59	$	63.62
2020	366	$	55.00	$	67.01
Total	14,591

Oil Basis Swaps

Contract Period	WTI Midland-NYMEX WTI Volumes	Weighted-Average  Contract Price (1)			NYMEX WTI-ICE Brent Volumes	Weighted-Average Contract Price (2)
	(MBbl)	(per Bbl)			(MBbl)	(per Bbl)
Third quarter 2018	3,018	$	(1.06	)	—	$	—
Fourth quarter 2018	3,327	$	(1.08	)	—	$	—
2019	11,217	$	(3.36	)	—	$	—
2020	7,250	$	(1.13	)	1,288	$	(7.97	)
2021	—	$	—		1,460	$	(7.80	)
2022	—	$	—		274	$	(7.67	)
Total	24,812				3,022

____________________________________________

⁽¹⁾   Represents the price differential between WTI Midland (Midland, Texas) and NYMEX WTI (Cushing, Oklahoma).

⁽²⁾   Represents the price differential between NYMEX WTI (Cushing, Oklahoma) and ICE Brent (North Sea).

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Gas Swaps

Contract Period	Sold IF HSC Volumes	Weighted-Average  Contract Price		Purchased IF HSC Volumes		Weighted-Average Contract Price		Net IF HSC Volumes	Weighted-Average Contract Price
	(BBtu)	(per MMBtu)		(BBtu)		(per MMBtu)		(BBtu)	(per MMBtu)
Third quarter 2018	28,218	$	3.25	(7,480	)	$	4.23	20,738	$	2.90
Fourth quarter 2018	28,204	$	3.27	(7,210	)	$	4.27	20,994	$	2.92
2019	41,394	$	3.87	(24,415	)	$	4.34	16,979	$	2.92
Total	97,816			(39,105	)			58,711

Gas Collars

Contract Period	IF HSC  Volumes	Weighted- Average Floor  Price		Weighted- Average Ceiling  Price
	(BBtu)	(per MMBtu)		(per MMBtu)
2019	14,242	$	2.50	$	2.83
Total	14,242

NGL Swaps

	OPIS Ethane Purity Mont Belvieu			OPIS Propane Mont Belvieu Non-TET			OPIS Normal Butane Mont Belvieu Non-TET			OPIS Isobutane Mont Belvieu Non-TET			OPIS Natural Gasoline Mont Belvieu Non-TET
Contract Period	Volumes	Weighted-Average  Contract Price		Volumes	Weighted-Average Contract Price		Volumes	Weighted-Average Contract Price		Volumes	Weighted-Average Contract Price		Volumes	Weighted-Average Contract Price
	(MBbl)	(per Bbl)		(MBbl)	(per Bbl)		(MBbl)	(per Bbl)		(MBbl)	(per Bbl)		(MBbl)	(per Bbl)
Third quarter 2018	1,033	$	10.99	610	$	24.27	93	$	35.70	70	$	35.07	202	$	51.13
Fourth quarter 2018	1,146	$	11.18	671	$	24.39	102	$	35.70	76	$	35.07	208	$	50.99
2019	3,533	$	12.31	1,503	$	27.83	154	$	35.64	117	$	35.70	197	$	50.93
2020	539	$	11.13	—	$	—	—	$	—	—	$	—	—	$	—
Total	6,251			2,784			349			263			607

Commodity Derivative Contracts Entered Into Subsequent to June 30, 2018

Subsequent to June 30, 2018, the Company entered into various commodity derivative contracts, as summarized below:

• NYMEX WTI costless collar contracts for 2020 for a total of 0.8 MMBbl of oil production with contract floor prices of $55.00 per Bbl and contract ceiling prices ranging from $64.50 per Bbl to $67.67 per Bbl;

• fixed price NYMEX WTI-ICE Brent basis swap contracts for 2020 for a total of 0.6 MMBbl of oil production at contract prices ranging from ($8.06) per Bbl to ($8.15) per Bbl;

• fixed price NYMEX WTI-ICE Brent basis swap contracts for 2021 for a total of 1.8 MMBbl of oil production at contract prices ranging from ($7.75) per Bbl to ($8.00) per Bbl;

• fixed price NYMEX WTI-ICE Brent basis swap contracts for 2022 for a total of 2.6 MMBbl of oil production at contract prices ranging from ($7.60) per Bbl to ($7.90) per Bbl; and

• fixed price OPIS Propane Mont Belvieu Non-TET swap contracts for 2019 for a total of 0.5 MMBbl of NGL production at contract prices ranging from $32.21 per Bbl to $32.26 per Bbl.

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Derivative Assets and Liabilities Fair Value

The Company’s commodity derivatives are measured at fair value and are included in the accompanying balance sheets as derivative assets and liabilities. The fair value of the commodity derivative contracts was a net liability of $149.4 million and $139.4 million as of June 30, 2018 and December 31, 2017, respectively.

The following table details the fair value of commodity derivative contracts recorded in the accompanying balance sheets, by category:

	As of June 30, 2018		As of December 31, 2017
	(in thousands)
Derivative assets:
Current assets	$	146,329	$	64,266
Noncurrent assets	31,151		40,362
Total derivative assets	$	177,480	$	104,628
Derivative liabilities:
Current liabilities	$	259,338	$	172,582
Noncurrent liabilities	67,583		71,402
Total derivative liabilities	$	326,921	$	243,984

Offsetting of Derivative Assets and Liabilities

As of June 30, 2018, and December 31, 2017, all derivative instruments held by the Company were subject to master netting arrangements with various financial institutions. In general, the terms of the Company’s agreements provide for offsetting of amounts payable or receivable between it and the counterparty, at the election of both parties, for transactions that settle on the same date and in the same currency. The Company’s agreements also provide that in the event of an early termination, the counterparties have the right to offset amounts owed or owing under that and any other agreement with the same counterparty. The Company’s accounting policy is to not offset these positions in its accompanying balance sheets.

The following table provides a reconciliation between the gross assets and liabilities reflected on the accompanying balance sheets and the potential effects of master netting arrangements on the fair value of the Company’s commodity derivative contracts:

	Derivative Assets						Derivative Liabilities
	As of						As of
	June 30,   2018			December 31, 2017			June 30,   2018			December 31, 2017
	(in thousands)
Gross amounts presented in the accompanying balance sheets	$	177,480		$	104,628		$	(326,921	)	$	(243,984	)
Amounts not offset in the accompanying balance sheets	(147,009		)	(100,035		)	147,009			100,035
Net amounts	$	30,471		$	4,593		$	(179,912	)	$	(143,949	)

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The following table summarizes the components of the net derivative (gain) loss line item presented in the accompanying statements of operations:

	For the Three Months Ended   June 30,					For the Six Months Ended   June 30,
	2018		2017			2018			2017
	(in thousands)
Derivative settlement (gain) loss:
Oil contracts	$	24,430	$	2,754		$	45,178		$	11,838
Gas contracts	757		(21,751		)	(5,653		)	(39,257		)
NGL contracts	11,478		2,694			21,668			11,109
Total derivative settlement (gain) loss	$	36,665	$	(16,303	)	$	61,193		$	(16,310	)
Net derivative (gain) loss:
Oil contracts	$	22,402	$	(38,194	)	$	36,368		$	(87,784	)
Gas contracts	7,000		(6,038		)	16,990			(50,506		)
NGL contracts	34,347		(10,957		)	17,920			(31,673		)
Total net derivative (gain) loss	$	63,749	$	(55,189	)	$	71,278		$	(169,963	)

Credit Related Contingent Features

As of June 30, 2018, and through the filing of this report, all of the Company’s derivative counterparties were members of the Company’s credit facility lender group. Under the Credit Agreement and derivative contracts, the Company is required to secure mortgages on assets having a value equal to at least 90 percent of the total PV-9 of the Company’s proved oil and gas properties evaluated in the most recent reserve report.

Note 11 - Fair Value Measurements

The Company follows fair value measurement accounting guidance for all assets and liabilities measured at fair value. This guidance defines fair value as the price that would be received to sell an asset or paid to transfer a liability (an exit price) in an orderly transaction between market participants at the measurement date. Market or observable inputs are the preferred sources of values, followed by assumptions based on hypothetical transactions in the absence of market inputs. The fair value hierarchy for grouping these assets and liabilities is based on the significance level of the following inputs:

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

• Level 2 – quoted prices in active markets for similar assets or liabilities, quoted prices for identical or similar instruments in markets that are not active, and model-derived valuations whose inputs are observable or whose significant value drivers are observable

• Level 3 – significant inputs to the valuation model are unobservable

The following table is a listing of the Company’s assets and liabilities that are measured at fair value in the accompanying balance sheets and where they are classified within the fair value hierarchy as of June 30, 2018:

	Level 1		Level 2		Level 3
	(in thousands)
Assets:
Derivatives (1)	$	—	$	177,480	$	—
Liabilities:
Derivatives (1)	$	—	$	326,921	$	—

__________________________________________

⁽¹⁾  This represents a financial asset or liability that is measured at fair value on a recurring basis.

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The following table is a listing of the Company’s assets and liabilities that are measured at fair value in the accompanying balance sheets and where they were classified within the fair value hierarchy as of December 31, 2017:

	Level 1		Level 2		Level 3
	(in thousands)
Assets:
Derivatives (1)	$	—	$	104,628	$	—
Liabilities:
Derivatives (1)	$	—	$	243,984	$	—

____________________________________________

⁽¹⁾  This represents a financial asset or liability that is measured at fair value on a recurring basis.

Both financial and non-financial assets and liabilities are categorized within the above fair value hierarchy based on the lowest level of input that is significant to the fair value measurement. The following is a description of the valuation methodologies used by the Company as well as the general classification of such instruments pursuant to the above fair value hierarchy.

Derivatives

The Company uses Level 2 inputs to measure the fair value of oil, gas, and NGL commodity derivatives. Fair values are based upon interpolated data. The Company derives internal valuation estimates taking into consideration forward commodity price curves, counterparties’ credit ratings, the Company’s credit rating, and the time value of money. These valuations are then compared to the respective counterparties’ mark-to-market statements. The considered factors result in an estimated exit price that management believes provides a reasonable and consistent methodology for valuing derivative instruments. The commodity derivative instruments utilized by the Company are not considered by management to be complex, structured, or illiquid. The oil, gas, and NGL commodity derivative markets are highly active.

Please refer to Note 10 - Derivative Financial Instruments and to Note 11 - Fair Value Measurements in the 2017 Form 10-K for more information regarding the Company’s derivative instruments.

Proved and Unproved Oil and Gas Properties and Other Property and Equipment

Proved oil and gas properties. Proved oil and gas property costs are evaluated for impairment and reduced to fair value when there is an indication the carrying costs may not be recoverable. The Company uses Level 3 inputs and the income valuation technique, which converts future cash flows to a single present value amount, to measure the fair value of proved properties through an application of discount rates and price forecasts representative of the current operating environment, as selected by the Company’s management. The calculation of the discount rates is based on the best information available and the rates used ranged from 10 percent to 15 percent based on the reservoir-specific weightings of future estimated proved and unproved cash flows as of June 30, 2018, and December 31, 2017. The Company believes the discount rates are representative of current market conditions and considers estimates of future cash payments, reserve categories, expectations of possible variations in the amount and/or timing of cash flows, the risk premium, and nonperformance risk. The prices for oil and gas are forecast based on NYMEX strip pricing, adjusted for basis differentials, for the first five years, after which a flat terminal price is used for each commodity stream. The prices for NGLs are forecast using OPIS pricing, for as long as the market is actively trading, after which a flat terminal price is used. Future operating costs are also adjusted as deemed appropriate for these estimates. There were no material impairments of proved properties during the three and six months ended June 30, 2018, or 2017.

Unproved oil and gas properties. Unproved oil and gas property costs are evaluated for impairment and reduced to fair value when there is an indication that the carrying costs may not be recoverable.  Lease acquisition costs that are not individually significant are aggregated by prospect and the portion of such costs estimated to be nonproductive prior to lease expiration are amortized over the appropriate period. The estimate of what could be nonproductive is based on historical trends or other information, including current drilling plans and the Company’s intent to renew leases. To measure the fair value of unproved properties, the Company uses a market approach, which takes into account the following significant assumptions: remaining lease terms, future development plans, risk-weighted potential resource recovery, estimated reserve values, and estimated acreage value based on price(s) received for similar, recent acreage transactions by the Company or other market participants. During the three and six months ended June 30, 2018, the Company recorded $11.9 million and $17.6 million, respectively, in abandonment and impairment of unproved properties expense related to lease expirations. There were no material abandonments or impairments of unproved properties expenses for the three or six months ended June 30, 2017.

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Oil and gas properties held for sale. Proved and unproved oil and gas properties classified as held for sale, including the corresponding asset retirement obligation liability, are valued using a market approach, based on an estimated net selling price, as evidenced by the most current bid prices received from third parties, if available. If an estimated selling price is not available, the Company utilizes the various income valuation techniques discussed above. Any initial write-down and subsequent changes to the fair value less estimated cost to sell is included within the net gain (loss) on divestiture activity line item in the accompanying statements of operations.

There were no material assets held for sale that were recorded at fair value as of June 30, 2018, or as of December 31, 2017. For the six months ended June 30, 2017, the Company recorded a $526.5 million write-down on assets previously held for sale. Please refer to Note 3 - Divestitures, Assets Held for Sale, and Acquisitions above as well as in the 2017 Form 10-K for more information regarding the Company’s oil and gas properties held for sale.

Long-Term Debt

The following table reflects the fair value of the Senior Notes and Senior Convertible Notes measured using Level 1 inputs based on quoted secondary market trading prices. These notes were not presented at fair value on the accompanying balance sheets as of June 30, 2018, or December 31, 2017, as they were recorded at carrying value, net of any unamortized discounts and deferred financing costs. On July 16, 2018, the 2021 Senior Notes were redeemed. Please refer to Note 5 - Long-Term Debt for additional discussion.

	As of June 30, 2018				As of December 31, 2017
	Principal Amount		Fair Value		Principal Amount		Fair Value
	(in thousands)
6.50% Senior Notes due 2021	$	344,611	$	352,634	$	344,611	$	351,682
6.125% Senior Notes due 2022	$	561,796	$	573,847	$	561,796	$	571,627
6.50% Senior Notes due 2023	$	394,985	$	401,380	$	394,985	$	403,434
5.0% Senior Notes due 2024	$	500,000	$	468,750	$	500,000	$	483,440
5.625% Senior Notes due 2025	$	500,000	$	485,000	$	500,000	$	494,355
6.75% Senior Notes due 2026	$	500,000	$	502,350	$	500,000	$	516,350
1.50% Senior Convertible Notes due 2021	$	172,500	$	178,446	$	172,500	$	168,291

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ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

This discussion includes forward-looking statements. Please refer to Cautionary Information about Forward-Looking Statementsat the end of this item for important information about these types of statements.

Overview of the Company

General Overview

We are an independent energy company engaged in the acquisition, exploration, development, and production of oil, gas, and NGLs in onshore North America. We currently have producing assets and significant acreage positions in the Midland Basin and Eagle Ford shale plays in Texas. Our strategic objective is to be a premier operator of top tier assets. We seek to maximize the value of our assets by applying industry leading technology and outstanding operational execution. Our portfolio is comprised of unconventional resource prospects with expanding prospective drilling opportunities, which we believe provide for long-term production and reserves growth. We are focused on achieving high full-cycle economic returns on our investments and maintaining a strong balance sheet.

Outlook for 2018

Our priorities for 2018, as set at the beginning of the year, are to:

• continue generating high margin returns from top tier projects that drive cash flow growth;

• core up our portfolio to focus on assets that generate the highest returns; and

• improve our credit metrics and maintain strong financial flexibility.

As previously announced, we completed three divestitures of non-core assets during the first half of 2018, which have generated total net proceeds of $741.6 million, subject to final purchase price adjustments. We have used these proceeds to support continued development of our core acreage positions in the Midland Basin and Eagle Ford shale, while maintaining an undrawn balance on our credit facility as of June 30, 2018. These proceeds also were used in part to call all of the $344.6 million aggregate principal amount outstanding on our 2021 Senior Notes, which we redeemed in full on July 16, 2018. Please refer to Note 3 - Divestitures, Assets Held for Sale, and Acquisitions and Note 5 - Long-Term Debt in Part I, Item 1 of this report for additional discussion.

We continue to see significant production growth and value within our Midland Basin assets as our operational execution in this program is yielding stronger than expected well results, which have been key to our continued increase in oil volumes produced. Our focus remains on developing our high-margin assets in the Midland Basin, which we believe will continue to provide us with the best opportunity for positive cash flow growth. Currently, due to robust drilling activity across the Permian Basin, the industry expects takeaway capacity to remain tight through mid-to-late 2019 as announced pipeline infrastructure build-out is completed. We remain proactive in managing risks associated with price and basis differential volatility through the use of commodity derivative instruments, which we expect to help mitigate the expected effects of increasing basis differentials and support our ability to continue to generate positive cash flows from our Midland Basis assets during this period. Please refer to Note 10 - Derivative Financial Instruments in Part I, Item 1 of this report for additional discussion.

Our capital program for 2018, excluding acquisitions, is expected to be approximately $1.31 billion, which reflects a slight increase of $40 million primarily to account for higher than expected working interests for projects in the Midland Basin. As a result of these higher working interests, we are also expecting a slight increase in full year net well completions for 2018. We expect to invest over 80 percent of our total capital program in drilling and completion activities. We plan to allocate the majority of our 2018 capital to our Midland Basin program, which generates the highest margins and returns in our portfolio. As a result of drilling and completion efficiencies in our Midland Basin program, we have been able to reduce the number of drilling rigs and completion crews that we are using in the area. Planned drilling and completion activity in the Eagle Ford shale continues to be partially funded by a third party as part of our previously announced drilling and completion carry agreement in a focused portion of our Eagle Ford North area. Please refer to Overview of Liquidity and Capital Resources below for additional discussion on our 2018 capital program.

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Financial Results

• We recorded net income of $17.2 million and $334.6 million, or $0.15 and $2.95 per diluted share, for the three and six months ended June 30, 2018, respectively, compared with net loss of $119.9 million and $45.5 million, or $1.08 and $0.41 per diluted share, for the three and six months ended June 30, 2017, respectively. Net income for the three and six months ended June 30, 2018, was driven largely by increased production revenue and net gain on divestiture activity of $39.5 million and $424.9 million, respectively, but was partially offset by net derivative losses of $63.7 million and $71.3 million for the three and six months ended June 30, 2018, respectively. Please refer to Comparison of Financial Results and Trends Between the Three Months and Six Months Ended June 30, 2018, and 2017below for additional discussion regarding the components of net income (loss) for each period presented.

• We had net cash provided by operating activities of $171.4 million and $311.5 million for the three and six months ended June 30, 2018, respectively, compared with $107.1 million and $242.1 million for the same periods in 2017, respectively. The increases in net cash provided by operating activities for the three and six months ended June 30, 2018, were driven largely by increased production revenue. Please refer to Overview of Liquidity and Capital Resourcesbelow for additional discussion of our sources and uses of cash.

• Adjusted EBITDAX, a non-GAAP financial measure, for the three and six months ended June 30, 2018, was $225.0 million and $435.1 million, respectively, compared with $154.0 million and $326.0 million for the same periods in 2017, respectively. The increases in adjusted EBITDAX for the three and six months ended June 30, 2018, were driven largely by increased production revenue and lower operating costs. Please refer to Non-GAAP Financial Measuresbelow for additional discussion, including our definition of adjusted EBITDAX and reconciliations of our net income (loss) and net cash provided by operating activities to adjusted EBITDAX.

Operational Activities

In our Midland Basin program, we began the second quarter of 2018 with nine operated drilling rigs and five completion crews. During the quarter, we released one rig and two completion crews. In July 2018, we released a second rig, bringing our total number of operated drilling rigs to seven. For the full year 2018, we anticipate that our Midland Basin program will average seven operated drilling rigs and four completion crews. During the second quarter of 2018, our operations continued to focus on delineating and developing the Lower Spraberry and Wolfcamp A and B shale intervals in our RockStar acreage in Howard and Martin Counties, Texas, as well as our Sweetie Peck acreage in Upton and Midland Counties, Texas. In addition, we completed the core build out of our water handling system during the second quarter of 2018, which is now operational and serving a significant portion of our water disposal needs on our RockStar acreage. We expect to allocate approximately 86 percent of our budgeted 2018 drilling and completion capital to our Midland Basin program.

During the second quarter of 2018, we expanded our core RockStar acreage position by acquiring approximately 720 contiguous net acres of unproved properties in Martin County, Texas, for cash consideration of $24.6 million. Further, we closed on the previously announced sale of our non-core third-party operated Halff East assets in the Midland Basin during the second quarter of 2018.

In our operated Eagle Ford shale program, we operated two drilling rigs and averaged one completion crew during the second quarter of 2018. For the full year 2018, we anticipate our Eagle Ford shale program will operate approximately one to two drilling rigs and one to two completion crews. Drilling and completion activities related to our previously announced drilling and completion carry agreement in a defined portion of our Eagle Ford North area continued throughout the second quarter of 2018. We expect the remaining wells associated with this agreement to be drilled and completed in 2018, with minimal capital investment required on our part. We plan to allocate approximately 14 percent of our budgeted 2018 drilling and completion capital to our Eagle Ford shale program.

During the first quarter of 2018, we successfully closed on the sale of our previously announced PRB Divestiture for net divestiture proceeds of $490.8 million, subject to final purchase price adjustments. In addition, during the second quarter of 2018, we closed on our previously announced sale of our remaining Bakken/Three Forks assets in Divide County, North Dakota.

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The table below provides a summary of changes in our drilled but not completed well count and current year drilling and completion activity in our operated programs during the three and six months ended June 30, 2018:

	Midland Basin				Eagle Ford Shale				Bakken/Three Forks (2)				Total
	Gross		Net		Gross		Net		Gross		Net		Gross		Net
Wells drilled but not completed at December 31, 2017	49		41		33		30		18		15		100		86
Wells drilled	35		33		11		8		—		—		46		41
Wells completed	(22	)	(17	)	(5	)	(5	)	—		—		(27	)	(22	)
Other (1)	—		1		—		—		—		—		—		1
Wells drilled but not completed at March 31, 2018	62		58		39		33		18		15		119		106
Wells drilled	29		28		10		6		—		—		39		34
Wells completed	(41	)	(38	)	(16	)	(9	)	—		—		(57	)	(47	)
Wells sold (2)	—		—		—		—		(18	)	(15	)	(18	)	(15	)
Wells drilled but not completed at June 30, 2018	50		48		33		30		—		—		83		78

____________________________________________

⁽¹⁾  Reflects net working interest changes resulting from normal business operations.

⁽²⁾  During the second quarter of 2018, we successfully closed on the sale of our remaining Bakken/Three Forks assets in Divide County, North Dakota. As a result, we will no longer have any drilling or completion activity in the Rocky Mountain region after the second quarter of 2018.

Production Results

The table below presents the disaggregation of our production by product type for each of our operating regions for the three months ended June 30, 2018, and 2017:

	Permian				South Texas & Gulf Coast				Rocky Mountain (1)				Total
	Three Months Ended June 30,				Three Months Ended June 30,				Three Months Ended June 30,				Three Months Ended June 30,
	2018		2017		2018		2017		2018		2017		2018		2017
Production:
Oil (MMBbl)	3.7		1.7		0.3		0.4		0.3		0.9		4.4		2.9
Gas (Bcf)	6.2		3.4		18.8		29.6		0.3		1.1		25.3		34.0
NGLs (MMBbl)	—		—		1.9		2.7		—		—		1.9		2.8
Equivalent (MMBOE)	4.8		2.3		5.4		8.0		0.4		1.1		10.5		11.3
Avg. daily equivalents (MBOE/d)	52.4		24.9		58.9		88.0		3.9		11.7		115.2		124.6
Relative percentage	46	%	20	%	51	%	71	%	3	%	9	%	100	%	100	%

____________________________________________

Note: Amounts may not calculate due to rounding.

⁽¹⁾   During the first quarter of 2018, we closed the PRB Divestiture, and during the second quarter of 2018, we closed the Divide County Divestiture. As a result of these divestitures, we will no longer have production volumes from the Rocky Mountain region after the second quarter of 2018.

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The table below presents the disaggregation of our production by product type for each of our operating regions for the six months ended June 30, 2018, and 2017:

	Permian				South Texas & Gulf Coast				Rocky Mountain (1)				Total
	Six Months Ended June 30,				Six Months Ended June 30,				Six Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017		2018		2017		2018		2017
Production:
Oil (MMBbl)	7.0		3.3		0.7		1.3		0.9		1.8		8.6		6.4
Gas (Bcf)	11.8		6.2		37.5		59.6		1.2		2.1		50.5		67.9
NGLs (MMBbl)	—		—		3.5		5.6		—		0.1		3.6		5.7
Equivalent (MMBOE)	9.0		4.4		10.5		16.8		1.1		2.3		20.6		23.4
Avg. daily equivalents (MBOE/d)	49.9		24.2		57.9		92.7		6.2		12.5		113.9		129.5
Relative percentage	44	%	19	%	51	%	71	%	5	%	10	%	100	%	100	%

____________________________________________

Note: Amounts may not calculate due to rounding.

⁽¹⁾   During the first quarter of 2018, we closed the PRB Divestiture, and during the second quarter of 2018, we closed the Divide County Divestiture. As a result of these divestitures, we will no longer have production volumes from the Rocky Mountain region after the second quarter of 2018.

Production on an equivalent basis decreasedeight percent and 12 percent for the three and six months ended June 30, 2018, respectively, compared with the same periods in 2017. Production declines were primarily a result of the divestiture of our outside-operated Eagle Ford shale assets, which occurred in the first quarter of 2017, and declining production from our retained assets in the South Texas & Gulf Coast and Rocky Mountain regions as a result of shifting capital from these assets to our Midland Basin program, which currently generates the highest returns in our portfolio. Production declines in the Eagle Ford and Rocky Mountain region were largely offset by the increased production from the development of our Midland Basin assets, which had production increases of 110 percent and 106 percent for the three and six months ended June 30, 2018, respectively, compared with the same periods in 2017. Please refer toA Three-Month and Six-Month Overview of Selected Production and Financial Information, Including TrendsandComparison of Financial Results and Trends Between the Three Months and Six Months Ended June 30, 2018, and 2017below for additional discussion on production.

Costs Incurred in Oil and Gas Producing Activities

Costs incurred in oil and gas property acquisition, exploration, and development activities, whether capitalized or expensed, totaled $460.2 million and $832.4 million for the three and six months ended June 30, 2018, respectively, and were incurred primarily in our Midland Basin and Eagle Ford shale programs.

Oil, Gas, and NGL Prices

Our financial condition and the results of our operations are significantly affected by the prices we receive for our oil, gas, and NGL production, which can fluctuate dramatically. When we refer to realized oil, gas, and NGL prices below, the disclosed price represents the average price for the respective period, before the effects of derivative settlements, unless otherwise indicated. While quoted NYMEX oil and gas and OPIS NGL prices are generally used as a basis for comparison within our industry, the prices we receive are affected by quality, energy content, location, and transportation differentials for these products.

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The following table summarizes commodity price data, as well as the effects of derivative settlements, for the second and first quarters of 2018, as well as the second quarter of 2017:

	For the Three Months Ended
	June 30, 2018			March 31, 2018			June 30, 2017
Oil (per Bbl):
Average NYMEX contract monthly price	$	67.88		$	62.87		$	48.28
Realized price, before the effect of derivative settlements	$	61.02		$	61.25		$	44.30
Effect of oil derivative settlements	$	(5.60	)	$	(4.86	)	$	(0.94	)
Gas:
Average NYMEX monthly settle price (per MMBtu)	$	2.80		$	3.00		$	3.18
Realized price, before the effect of derivative settlements (per Mcf)	$	3.32		$	3.14		$	2.99
Effect of gas derivative settlements (per Mcf)	$	(0.03	)	$	0.25		$	0.64
NGLs (per Bbl):
Average OPIS price (1)	$	33.10		$	30.87		$	24.11
Realized price, before the effect of derivative settlements	$	27.55		$	25.53		$	19.71
Effect of NGL derivative settlements	$	(6.04	)	$	(6.09	)	$	(0.98	)

____________________________________________

⁽¹⁾   Average OPIS prices per barrel of NGL, historical or strip, are based on a product mix of 37% Ethane, 32% Propane, 6% Isobutane, 11% Normal Butane, and 14% Natural Gasoline for all periods presented. This product mix represents the industry standard composite barrel and does not necessarily represent our product mix for NGL production. Realized prices reflect our actual product mix.

We expect future prices for oil, gas, and NGLs to continue to be volatile.  In addition to supply and demand fundamentals, as a global commodity, the price of oil is affected by real or perceived geopolitical risks in various regions of the world as well as the relative strength of the United States dollar compared to other currencies. Oil markets have strengthened due to recent inventory drawdowns, but we expect oil prices to remain volatile due to uncertainty in global supply and demand.

We expect gas prices to remain near current levels in the near term due to the abundance of supply relative to demand. Demand from increased liquefied natural gas (“LNG”) exports and gas exports to Mexico are expected to help balance supply.

We expect NGL prices to continue to benefit from increased demand from export and petrochemical markets while being offset by increased drilling activity.

The following table summarizes 12-month strip prices for NYMEX WTI oil, NYMEX Henry Hub gas, and OPIS NGLs (same product mix as discussed under the table above) as of July 25, 2018, and June 30, 2018:

	As of July 25, 2018		As of June 30, 2018
NYMEX WTI oil (per Bbl)	$	66.91	$	69.58
NYMEX Henry Hub gas (per MMBtu)	$	2.78	$	2.91
OPIS NGLs (per Bbl)	$	33.25	$	33.30

We use financial derivative instruments as part of our financial risk management program. We have a financial risk management policy governing our use of derivatives.  The amount of our production covered by derivatives is driven by the amount of debt on our balance sheet, the level of capital commitments and long-term obligations we have in place, and our ability to enter into favorable derivative commodity contracts.  With our current derivative contracts, we believe we have partially reduced our exposure to volatility in commodity prices and price differentials in the near term. Our use of costless collars for a portion of our derivatives allows us to participate in some of the upward movements in oil and gas prices while also setting a price floor for a portion of our oil and gas production. Please refer to Note 10 - Derivative Financial Instruments in Part I, Item 1 of this report and to Commodity Price Riskin Overview of Liquidity and Capital Resourcesbelow for additional information regarding our oil, gas, and NGL derivatives.

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Financial Results of Operations and Additional Comparative Data

The tables below provide information regarding selected production and financial information for the three months ended June 30, 2018, and the immediately preceding three quarters. A detailed discussion follows.

	For the Three Months Ended
	June 30,		March 31,		December 31,			September 30,
	2018		2018		2017			2017
	(in millions)
Production (MMBOE)	10.5		10.1		10.4			10.7
Oil, gas, and NGL production revenue	$	402.6	$	382.9	$	341.2		$	294.5
Oil, gas, and NGL production expense	$	117.4	$	120.9	$	122.8		$	122.7
Depletion, depreciation, amortization, and asset retirement obligation liability accretion	$	151.8	$	130.5	$	131.4		$	134.6
Exploration (1)	$	14.1	$	13.7	$	15.8		$	14.1
General and administrative (1)	$	28.9	$	27.7	$	32.7		$	27.6
Net income (loss)	$	17.2	$	317.4	$	(26.3	)	$	(89.1	)

____________________________________________

Note: Amounts may not calculate due to rounding.

⁽¹⁾  Certain prior period amounts have been adjusted to conform to the current period presentation on the condensed consolidated financial statements. Please refer to Recently Issued Accounting Standards in Note 1 - Summary of Significant Accounting Policies in Part I, Item 1 of this report for additional discussion.

Selected Performance Metrics

	For the Three Months Ended
	June 30,			March 31,			December 31,			September 30,
	2018			2018			2017			2017
Average net daily production equivalent (MBOE per day)	115.2			112.7			112.6			116.0
Lease operating expense (per BOE)	$	4.66		$	4.95		$	5.10		$	4.81
Transportation costs (per BOE)	$	4.47		$	4.63		$	5.01		$	5.24
Production taxes as a percent of oil, gas, and NGL production revenue	4.3		%	4.4		%	4.3		%	4.2		%
Ad valorem tax expense (per BOE)	$	0.41		$	0.67		$	0.33		$	0.29
Depletion, depreciation, amortization, and asset retirement obligation liability accretion (per BOE)	$	14.48		$	12.87		$	12.69		$	12.61
General and administrative (per BOE) (1)	$	2.76		$	2.73		$	3.15		$	2.58

____________________________________________

Note: Amounts may not calculate due to rounding.

⁽¹⁾  Certain prior period amounts have been adjusted to conform to the current period presentation on the condensed consolidated financial statements. Please refer to Recently Issued Accounting Standards in Note 1 - Summary of Significant Accounting Policies in Part I, Item 1 of this report for additional discussion.

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A Three-Month and Six-Month Overview of Selected Production and Financial Information, Including Trends

	For the Three Months Ended June 30,						Amount Change Between Periods			Percent Change Between Periods		For the Six Months Ended June 30,						Amount Change Between Periods			Percent Change Between Periods
	2018			2017								2018			2017
Net production volumes: (1)
Oil (MMBbl)	4.4			2.9			1.5			50	%	8.6			6.4			2.2			34	%
Gas (Bcf)	25.3			34.0			(8.7		)	(26	)%	50.5			67.9			(17.4		)	(26	)%
NGLs (MMBbl)	1.9			2.8			(0.9		)	(31	)%	3.6			5.7			(2.1		)	(37	)%
Equivalent (MMBOE)	10.5			11.3			(0.9		)	(8	)%	20.6			23.4			(2.8		)	(12	)%
Average net daily production: (1)
Oil (MBbl per day)	47.9			32.0			16.0			50	%	47.6			35.5			12.1			34	%
Gas (MMcf per day)	278.3			374.1			(95.8		)	(26	)%	279.3			375.3			(96.1		)	(26	)%
NGLs (MBbl per day)	20.9			30.3			(9.4		)	(31	)%	19.7			31.4			(11.6		)	(37	)%
Equivalent (MBOE per day)	115.2			124.6			(9.4		)	(8	)%	113.9			129.5			(15.5		)	(12	)%
Oil, gas, and NGL production revenue (in millions): (1)
Oil production revenue	$	266.2		$	128.9		$	137.3		107	%	$	527.2		$	296.5		$	230.7		78	%
Gas production revenue	84.1			101.7			(17.6		)	(17	)%	163.2			202.9			(39.7		)	(20	)%
NGL production revenue	52.3			54.3			(2.0		)	(4	)%	95.1			118.7			(23.7		)	(20	)%
Total oil, gas, and NGL production revenue	$	402.6		$	284.9		$	117.6		41	%	$	785.4		$	618.1		$	167.3		27	%
Oil, gas, and NGL production expense (in millions): (1)
Lease operating expense	$	48.8		$	46.6		$	2.2		5	%	$	99.0		$	92.7		$	6.3		7	%
Transportation costs	46.9			64.7			(17.8		)	(28	)%	93.8			135.8			(42.0		)	(31	)%
Production taxes	17.4			11.3			6.1			54	%	34.4			25.4			9.0			35	%
Ad valorem tax expense	4.3			1.8			2.5			139	%	11.1			8.5			2.6			31	%
Total oil, gas, and NGL production expense	$	117.4		$	124.4		$	(7.0	)	(6	)%	$	238.3		$	262.4		$	(24.1	)	(9	)%
Realized price (before the effect of derivative settlements):
Oil (per Bbl)	$	61.02		$	44.30		$	16.72		38	%	$	61.14		$	46.08		$	15.06		33	%
Gas (per Mcf)	$	3.32		$	2.99		$	0.33		11	%	$	3.23		$	2.99		$	0.24		8	%
NGLs (per Bbl)	$	27.55		$	19.71		$	7.84		40	%	$	26.60		$	20.92		$	5.68		27	%
Per BOE	$	38.40		$	25.13		$	13.27		53	%	$	38.09		$	26.38		$	11.71		44	%
Per BOE data:
Production costs:
Lease operating expense	$	4.66		$	4.11		$	0.55		13	%	$	4.80		$	3.96		$	0.84		21	%
Transportation costs	$	4.47		$	5.71		$	(1.24	)	(22	)%	$	4.55		$	5.79		$	(1.24	)	(21	)%
Production taxes	$	1.66		$	1.00		$	0.66		66	%	$	1.67		$	1.09		$	0.58		53	%
Ad valorem tax expense	$	0.41		$	0.16		$	0.25		156	%	$	0.54		$	0.36		$	0.18		50	%
Depletion, depreciation, amortization, and asset retirement obligation liability accretion	$	14.48		$	13.52		$	0.96		7	%	$	13.69		$	12.42		$	1.27		10	%
General and administrative (2)	$	2.76		$	2.49		$	0.27		11	%	$	2.74		$	2.43		$	0.31		13	%
Derivative settlement gain (loss) (3)	$	(3.49	)	$	1.44		$	(4.93	)	(342	)%	$	(2.97	)	$	0.70		$	(3.67	)	(524	)%
Earnings per share information:
Basic net income (loss) per common share	$	0.15		$	(1.08	)	$	1.23		114	%	$	3.00		$	(0.41	)	$	3.41		832	%
Diluted net income (loss) per common share	$	0.15		$	(1.08	)	$	1.23		114	%	$	2.95		$	(0.41	)	$	3.36		820	%
Basic weighted-average common shares outstanding (in thousands)	111,701			111,277			424			—	%	111,698			111,274			424			—	%
Diluted weighted-average common shares outstanding (in thousands)	113,630			111,277			2,353			2	%	113,267			111,274			1,993			2	%

33

______________________________________

⁽¹⁾  Amount and percentage changes may not calculate due to rounding.

⁽²⁾  Prior periods have been adjusted to conform to the current period presentation on the condensed consolidated financial statements. Please refer to Recently Issued Accounting Standards in Note 1 - Summary of Significant Accounting Policies in Part I, Item 1 of this report for additional discussion.

⁽³⁾  Derivative settlements for the three and six months ended June 30, 2018, and 2017, are included within the net derivative (gain) loss line item in the accompanying statements of operations.

Average net equivalent daily production for the three and six months ended June 30, 2018, decreasedeight percent and 12 percent, respectively, compared with the same periods in 2017. This decrease was primarily due to the divestiture of our outside-operated Eagle Ford shale assets in the first quarter of 2017, the PRB, Divide County, and Halff East divestitures in the first half of 2018, and declining production from our retained Eagle Ford shale assets as a result of shifting capital from this area to fund development of our Midland Basin assets. For the full year 2018, we expect total production to be in line with 2017, as actual and anticipated production increases in our Midland Basin program offset the production decreases resulting from our 2017 and 2018 divestiture activities and declines from our operated Eagle Ford shale program. On a retained asset basis, we expect production to increase and the percentage of oil relative to our total product mix to also increase in 2018 compared with 2017. Please refer toComparison of Financial Results and Trends Between the Three Months and Six Months Ended June 30, 2018, and 2017below for additional discussion.

Changes in production volumes, revenues, and costs are directly influenced by the volatility of commodity prices for the products we produce, fluctuations in costs necessary to develop and operate our properties, our ability to increase efficiencies in operations, and changes in our overall asset portfolio. We present certain information on a per BOE basis in order to evaluate our performance relative to our peers and to identify and measure trends we believe may require additional analysis and discussion.

Our realized price before the effect of derivative settlements on a per BOE basis for the three and six months ended June 30, 2018, increased53 percent and 44 percent, respectively, compared with the same periods in 2017. For the three and six months ended June 30, 2018, we realized a loss of $3.49 and $2.97 per BOE, respectively, on the settlement of our derivative contracts, which was primarily driven by improving oil and NGL prices in 2018. For the three and six months ended June 30, 2017, we realized a gain of $1.44 and $0.70 per BOE, respectively, on the settlement of our derivative contracts.

Lease operating expense (“LOE”) on a per BOE basis increased13 percent and 21 percent, for the three and six months ended June 30, 2018, respectively, compared with the same periods in 2017. The increase in LOE on a per BOE basis was driven by the increase in oil production as a percentage of our total product mix, and production declines from our Eagle Ford shale assets, which have lower average lifting costs. We expect LOE on a per BOE basis to be higher in 2018 compared with 2017 as our product mix continues to shift toward more oil production, which typically has higher LOE per BOE. We expect to experience volatility in our LOE as a result of changes in industry activity and the effects this has on service provider costs, changes in total production, changes in our overall production mix, and timing of workover projects.

Transportation expense on a per BOE basis decreased22 percent and 21 percent, for the three and six months ended June 30, 2018, respectively, compared with the same periods in 2017. As discussed in the Production Results section above, the decrease in transportation costs per BOE was primarily driven by production declines from our Eagle Ford shale assets, which have higher average transportation costs than our Midland Basin assets. Going forward, we expect total transportation expense to fluctuate in line with changes in production from our operated Eagle Ford shale program as these assets incur the majority of our transportation costs. On a per BOE basis, we expect transportation costs to decrease in 2018 as production from our Midland Basin assets becomes a larger portion of our total production. The majority of our Midland Basin production is currently sold at the wellhead, and therefore, we incur minimal transportation expense on these assets.

Production taxes on a per BOE basis increased66 percent and 53 percent, for the three and six months ended June 30, 2018, respectively, compared with the same periods in 2017. This increase was primarily driven by a 53 percent and 44 percent increase in our realized price before the effect of derivative settlements for the three and six months ended June 30, 2018, respectively, compared with the same periods in 2017. There was also a slight increase in our overall production tax rate, which for the six months ended June 30, 2018, was 4.4 percent, compared with 4.1 percent for the same period in 2017. This increase in our company-wide production tax rate is primarily a result of the increase in oil revenue as a percentage of total revenue and overall increase in realized oil prices. We generally expect production tax expense to trend with oil, gas, and NGL production revenue on an absolute and per BOE basis. Product mix, the location of production, and incentives to encourage oil and gas development can also impact the amount of production tax we recognize.

34

Ad valorem tax expense on a per BOE basis increased156 percent and 50 percent for the three and six months ended June 30, 2018, respectively, compared with the same periods in 2017 as a result of changes in our asset and production base and increased commodity price assumptions used in 2018 property tax valuations. As a result, we expect an increase in ad valorem tax expense for the full year 2018 as compared with 2017 in total and on a per BOE basis.

Depletion, depreciation, amortization, and asset retirement obligation liability accretion (“DD&A”) expense on a per BOE basis increasedseven percent and 10 percent, for the three and six months ended June 30, 2018, respectively, compared with the same periods in 2017. The increase for the three and six months ended June 30, 2018, is driven by the increase in production volumes from our Midland Basin assets, which have higher depletion rates than our Eagle Ford shale assets. Our DD&A rate fluctuates as a result of impairments, divestiture activity, changes in our production mix, and changes in our total estimated proved reserve volumes. In general, we expect DD&A expense on a per BOE basis for the full year 2018 to increase compared with 2017 as production from our Midland Basin assets continues to increase as a percentage of our total production.

General and administrative (“G&A”) expense on a per BOE basis increased11 percent and 13 percent for the three and six months ended June 30, 2018, respectively, compared with the same periods in 2017 due to the lower production volumes as a result of divestitures and declining production from our retained operated Eagle Ford shale assets. We expect total G&A expense for the full year 2018 to be relatively flat compared with 2017. We expect G&A expense on a per BOE basis in 2018 to also be flat compared with 2017 as full year 2018 production is expected to be in line with 2017.

Please refer toComparison of Financial Results and Trends Between the Three Months and Six Months Ended June 30, 2018, and 2017below for additional discussion on operating expenses.

Please refer to Note 9 - Earnings Per Share in Part I, Item 1 of this report for discussion of our basic and diluted net income (loss) per common share calculations.

Comparison of Financial Results and Trends Between the Three Months and Six Months Ended June 30, 2018, and 2017

Net equivalent production, production revenue, and production expense

The following table presents the regional changes in our net equivalent production, production revenue, and production expense between the three and six months ended June 30, 2018, and 2017:

	Net Equivalent Production Increase (Decrease)				Production Revenue Increase (Decrease)						Production Expense Increase (Decrease)
	Three Months Ended		Six Months Ended		Three Months Ended			Six Months Ended			Three Months Ended			Six Months Ended
	(MMBOE)				(in millions)						(in millions)
Permian	2.5		4.7		$	167.9		$	305.7		$	20.6		$	41.6
South Texas & Gulf Coast	(2.6	)	(6.3	)	(30.6		)	(106.9		)	(17.5		)	(52.4		)
Rocky Mountain (1)	(0.7	)	(1.2	)	(19.7		)	(31.5		)	(10.1		)	(13.4		)
Total	(0.9	)	(2.8	)	$	117.6		$	167.3		$	(7.0	)	$	(24.1	)

__________________________________________

Note: Amounts may not calculate due to rounding.

⁽¹⁾   During the first quarter of 2018, we closed the PRB Divestiture, and during the second quarter of 2018, we closed the Divide County Divestiture. As a result of these divestitures, we will no longer have production volumes from the Rocky Mountain region after the second quarter of 2018.

For the three months and six months ended June 30, 2018, compared with the same periods in 2017, we experienced an eight percent and a 12 percent decrease, respectively, in net equivalent production volumes primarily as a result of divestiture activity and declining production from our retained Eagle Ford shale assets as a result of shifting capital to our Midland Basin program. These declines were largely offset by increased production in our Permian region, which compared with the same periods in 2017, had production increases of 110 percent and 106 percent for the three and six months ended June 30, 2018, respectively. Increased production in the Permian region also drove oil production as a percentage of our overall product mix to increase from 27 percent for the six months ended June 30, 2017, to 42 percent for the six months ended June 30, 2018. Compared with the same periods in 2017, realized prices on a per BOE basis increased 53 percent and 44 percent for the three and six months ended June 30, 2018, respectively, resulting in an overall 41 percent and 27 percent increase in oil, gas, and NGL production revenues for the three and six months ended June 30, 2018, respectively. Production expense for the three and six months ended June 30, 2018, compared with the same periods in 2017, decreased six percent and nine percent, respectively, primarily as a result of the decreased production volumes discussed above.

35

Please refer to A Three-Month and Six-Month Overview of Selected Production and Financial Information, Including Trends above for discussion of trends on a per BOE basis.

Net gain (loss) on divestiture activity

	For the Three Months Ended   June 30,					For the Six Months Ended   June 30,
	2018		2017			2018		2017
	(in millions)
Net gain (loss) on divestiture activity	$	39.5	$	(167.1	)	$	424.9	$	(129.7	)

The $39.5 million net gain on divestiture activity recorded for the three months ended June 30, 2018, was primarily the result of a net gain recorded for the Halff East Divestiture partially offset by a loss recorded for the Divide County Divestiture. The $424.9 million net gain on divestiture activity recorded for the six months ended June 30, 2018, was primarily the result of an estimated net gain of $410.1 million recorded for the PRB Divestiture, which closed in the first quarter of 2018.

The net loss on divestiture activity recorded for the three months ended June 30, 2017, was a result of a $166.9 million write-down recorded on certain North Dakota assets that were reclassified from assets held for sale to assets held for use, based on market conditions that existed when we decided to retain these assets during 2017. There was also a $359.6 million write-down recorded on these assets in the first quarter of 2017 based on the estimated fair value less selling costs as of March 31, 2017. Partially offsetting these write-downs recorded during the six months ended June 30, 2017, was the $397.4 million net gain recorded on the sale of our outside-operated Eagle Ford shale assets.

Please refer to Note 3 - Divestitures, Assets Held for Sale, and Acquisitions in Part I, Item 1 of this report for additional discussion.

Depletion, depreciation, amortization, and asset retirement obligation liability accretion

	For the Three Months Ended   June 30,				For the Six Months Ended   June 30,
	2018		2017		2018		2017
	(in millions)
Depletion, depreciation, amortization, and asset retirement obligation liability accretion	$	151.8	$	153.2	$	282.2	$	291.0

DD&A expense decreasedone percent and three percent for the three and six months ended June 30, 2018, respectively, compared with the same periods in 2017, due to the decline in our production volumes and the impact of assets sold. Please refer to the section A Three-Month and Six-Month Overview of Selected Production and Financial Information, Including Trendsabove for further discussion of DD&A expense on a per BOE basis.

Exploration

	For the Three Months Ended   June 30,				For the Six Months Ended   June 30,
	2018		2017		2018		2017
	(in millions)
Exploration (1)	$	14.1	$	13.0	$	27.8	$	24.8

______________________________________

⁽¹⁾ Prior periods have been adjusted to conform to the current period presentation on the condensed consolidated financial statements. Please refer to Recently Issued Accounting Standards in Note 1 - Summary of Significant Accounting Policies in Part I, Item 1 of this report for additional discussion.

Exploration expense increased eight percent and 12 percent for the three and six months ended June 30, 2018, respectively, compared with the same periods in 2017, due to increased expenditures for geological and geophysical activity on our Midland Basin assets. As we continue our focus on testing and delineating our Midland Basin acreage, we expect increased exploration activity and related expenses for the full year 2018 compared with 2017. Exploration expense may vary depending upon allocated overhead and exploratory dry hole expense.

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Abandonment and impairment of unproved properties

	For the Three Months Ended   June 30,				For the Six Months Ended   June 30,
	2018		2017		2018		2017
	(in millions)
Abandonment and impairment of unproved properties	$	11.9	$	0.2	$	17.6	$	0.2

Unproved property impairments recorded for the three and six months ended June 30, 2018, and 2017, related to lease expirations. We expect unproved property impairments to fluctuate with the timing of lease expirations, unsuccessful exploration activities, and changing economics associated with decreases in commodity prices. Additionally, changes in drilling plans, downward engineering revisions, or unsuccessful exploration efforts may result in unproved property impairments. Any amount of future impairment is difficult to predict, but based on updated commodity price assumptions as of July 25, 2018, we do not expect any material impairments in the third quarter of 2018 resulting from commodity price impacts. Abandonment and impairment of unproved properties expense will be recognized as additional lease expirations are identified.

General and administrative

	For the Three Months Ended   June 30,				For the Six Months Ended   June 30,
	2018		2017		2018		2017
	(in millions)
General and administrative (1)	$	28.9	$	28.2	$	56.6	$	57.1

______________________________________

⁽¹⁾ Prior periods have been adjusted to conform to the current period presentation on the condensed consolidated financial statements. Please refer to Recently Issued Accounting Standards in Note 1 - Summary of Significant Accounting Policies in Part I, Item 1 of this report for additional discussion.

G&A expense was relatively flat for the three and six months ended June 30, 2018, compared with the same periods in 2017. We expect G&A expense in total to continue to remain flat for the full year 2018 compared with 2017. Please refer to the section A Three-Month and Six-Month Overview of Selected Production and Financial Information, Including Trendsabove for further discussion of G&A expense on an absolute and per BOE basis.

Net derivative (gain) loss

	For the Three Months Ended   June 30,					For the Six Months Ended   June 30,
	2018		2017			2018		2017
	(in millions)
Net derivative (gain) loss	$	63.7	$	(55.2	)	$	71.3	$	(170.0	)

We recognized a $63.7 million derivative loss for the three months ended June 30, 2018, due in part to a $59.3 million decrease in the fair value of contracts settling subsequent to June 30, 2018. Additionally, we recognized a $4.4 million loss on contracts that settled during the second quarter of 2018, which had a fair value of $32.2 million at March 31, 2018, and settled for a loss of $36.7 million. We recognized a $3.2 million loss on first quarter 2018 contract settlements and recorded a $4.4 million decrease to the fair value of remaining contracts as of March 31, 2018, resulting in a year-to-date net derivative loss of $71.3 million for the six months ended June 30, 2018.

We recognized a $55.2 million derivative gain for the three months ended June 30, 2017, due largely to a $51.1 million increase in the fair value of contracts settling subsequent to June 30, 2017. Additionally, we recognized a $4.1 million gain on contracts that settled during the second quarter of 2017, which had a fair value of $12.2 million at March 31, 2017, and settled for $16.3 million. We recognized a $20.5 million gain on first quarter 2017 contract settlements and recorded a $94.3 million increase in the fair value of remaining contracts as of March 31, 2017, resulting in a year-to-date net derivative gain of $170.0 million.

Please refer to Note 10 - Derivative Financial Instruments in Part I, Item 1 of this report for additional information.

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Interest expense

	For the Three Months Ended   June 30,						For the Six Months Ended   June 30,
	2018			2017			2018			2017
	(in millions)
Interest expense	$	(41.7	)	$	(44.6	)	$	(84.7	)	$	(91.5	)

The seven percentdecrease in interest expense for both the three and six months ended June 30, 2018, compared with the same periods in 2017, was primarily driven by an increase in capitalized interest as a result of our higher level of development activity. Please refer to Note 5 - Long-Term Debt in Part I, Item I of this report and Overview of Liquidity and Capital Resourcesbelow for additional information.

Income tax (expense) benefit

	For the Three Months Ended   June 30,						For the Six Months Ended   June 30,
	2018			2017			2018			2017
	(in millions, except tax rate)
Income tax (expense) benefit	$	0.9		$	71.1		$	(98.1	)	$	26.6
Effective tax rate	(5.5		)%	37.2		%	22.7		%	36.9		%

The decrease in the effective tax rate for the three and six months ended June 30, 2018, compared with the same periods in 2017, was primarily due to the decrease in the federal tax rate caused by enactment of the 2017 Tax Act, which reduced the highest marginal corporate tax rate from 35 percent to 21 percent. For the three months ended June 30, 2018 and June 30, 2017, the effect of minor changes to permanent state items on changing year-to-date pretax income caused an additional rate decrease year-over-year. The rate also decreased year-over-year due to the cumulative effect of a change in the highest marginal state rate resulting from the Divide County Divestiture. Please refer to Overview of Liquidity and Capital Resources below as well as Note 4 - Income Taxes in Part I, Item 1 of this report for additional discussion.

Overview of Liquidity and Capital Resources

Based on the current commodity price environment, we believe we have sufficient liquidity and capital resources to execute our business plan for the foreseeable future. We continue to manage the duration and level of our drilling and completion service commitments to maintain the flexibility to adjust our activity and capital expenditures during periods of prolonged weak commodity prices or to respond should commodity prices recover further.

Sources of Cash

We currently expect our 2018 capital program to be funded by cash flows from operations and proceeds from the divestiture of properties. During the six months ended June 30, 2018, we received $742.2 million of net proceeds from the sale of oil and gas properties. As of June 30, 2018, our cash balance totaled $615.9 million. As of June 30, 2018, the combination of our cash balance with our $999.8 million of available borrowing capacity under our Credit Agreement, resulted in $1.6 billion in liquidity.

Although we anticipate cash flows from operations and divestiture proceeds will be sufficient to fund our expected 2018 capital program and the 2021 Senior Notes Redemption, which was completed on July 16, 2018, we may also elect to borrow under our Credit Agreement and/or raise funds through debt or equity financings or from other sources. Further, we may enter into additional carrying cost funding and sharing arrangements with third parties for particular exploration and/or development programs. See Credit Agreement below for discussion of the net increase in our borrowing base in the second quarter of 2018. Our borrowing base could be reduced as a result of lower commodity prices, divestitures of proved properties, or newly issued debt. If we raise additional funds through the issuance of equity or convertible debt securities, the percentage ownership of our current stockholders could be diluted, and these newly-issued securities may have rights, preferences, or privileges senior to those of existing stockholders. Any future downgrades in our credit ratings could make it more difficult or expensive for us to borrow additional funds. All of our sources of liquidity can be affected by the general condition of the broader economy and by fluctuations in commodity prices, operating costs, and volumes produced, all of which affect us and our industry.

We have no control over the market prices for oil, gas, or NGLs, although we may be able to influence the amount of our realized revenues from our oil, gas, and NGL sales through the use of derivative contracts as part of our commodity price risk

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management program. Please refer to Note 10 - Derivative Financial Instrumentsin Part I, Item 1 of this report for additional information about our oil, gas, and NGL derivative contracts currently in place and the timing of settlement of those contracts.

The enactment of the 2017 Tax Act reduced our highest marginal corporate tax rate for 2018 and future years from 35 percent to 21 percent. It also eliminated the domestic production activities deduction for all taxpayers, the alternative minimum tax (“AMT”) for corporate taxpayers, and may impact our ability to deduct interest expense in future years. However, it did not impact current tax deductions for intangible drilling costs, percentage depletion, or amortization of geological and geophysical expenses, and it will allow us the option to expense 100 percent of our equipment acquisition costs in future years. In general, we believe the enactment of the 2017 Tax Act will have a positive impact on our future operating cash flows.

Credit Agreement

Our Credit Agreement provides for a maximum loan amount of $2.5 billion and has a maturity date of December 10, 2019. On April 24, 2018, as part of the regular, semi-annual borrowing base redetermination process, our borrowing base and aggregate lender commitments were increased to $1.4 billion and $1.0 billion, respectively. The increase in the borrowing base was primarily driven by the increased value of our estimated proved reserves at December 31, 2017. Upon completion of the Divide County Divestiture on May 30, 2018, the borrowing base was reduced to $1.3 billion while the aggregate lender commitments remained at $1.0 billion. The next scheduled redetermination date is October 1, 2018.

We had no outstanding balance under our Credit Agreement as of June 30, 2018, or as of the filing of this report. No individual bank participating in our Credit Agreement represents more than 10 percent of the lender commitments under the Credit Agreement. Please refer to Note 5 - Long-Term Debt in Part I, Item 1 of this report for additional discussion as well as the presentation of the outstanding balance, total amount of letters of credit, and available borrowing capacity under our Credit Agreement as of July 25, 2018, June 30, 2018, and December 31, 2017.

We must comply with certain financial and non-financial covenants under the Credit Agreement, including covenants limiting dividend payments and requiring us to maintain certain financial ratios, as defined by the Credit Agreement. Certain financial covenants under the Credit Agreement require, as of the last day of each fiscal quarter, our (a) ratio of senior secured debt to 12-month trailing adjusted EBITDAX to be not more than 2.75 to 1.0; (b) adjusted current ratio to be not less than 1.0 to 1.0; and (c) ratio of 12-month trailing adjusted EBITDAX to interest expense to be not less than 2.0 to 1.0. We were in compliance with all financial and non-financial covenants under the Credit Agreement as of June 30, 2018, and through the filing of this report. Please refer to the caption Non-GAAP Financial Measuresbelow for the calculation of adjusted EBITDAX and reconciliations of net income (loss) and net cash provided by operating activities to adjusted EBITDAX.

We had no credit facility activity during the six months ended June 30, 2018, due to our cash balance resulting primarily from proceeds received from divestiture activity. Cash flows provided by our operating activities, divestiture proceeds, capital markets activity, and the amount of our capital expenditures, including acquisitions, all impact the amount we borrow under our credit facility.

Weighted-Average Interest Rates

Our weighted-average interest rates include paid and accrued interest, fees on the unused portion of the aggregate commitment amount under the Credit Agreement, letter of credit fees, the non-cash amortization of deferred financing costs, and the non-cash amortization of the discount related to the Senior Convertible Notes. Our weighted-average borrowing rate includes paid and accrued interest only.

The following table presents our weighted-average interest rate and our weighted-average borrowing rate for the three and six months ended June 30, 2018, and 2017:

	For the Three Months Ended   June 30,				For the Six Months Ended   June 30,
	2018		2017		2018		2017
Weighted-average interest rate	6.4	%	6.4	%	6.5	%	6.5	%
Weighted-average borrowing rate	5.8	%	5.8	%	5.8	%	5.8	%

The weighted-average interest rate and weighted-average borrowing for the three and six months ended June 30, 2018, remained consistent as compared with the same periods in 2017. We would expect our weighted-average interest and borrowing rates to fluctuate based on the timing and amount of Senior Notes redemptions, changes in our aggregate lender commitment amount on our

39

credit facility, and the average balance on our credit facility. Please refer to Note 5 - Long-Term Debt in Part I, Item 1 of this report for additional discussion.

Uses of Cash

We use cash for the acquisition, exploration, and development of oil and gas properties and for the payment of operating and general and administrative costs, income taxes, dividends, and debt obligations, including interest. Expenditures for the acquisition, exploration, and development of oil and gas properties are the primary use of our capital resources. During the six months ended June 30, 2018, we spent $747.9 million on capital expenditures and on acquiring unproved oil and gas properties. This amount differs from the costs incurred amount, which is accrual-based and includes asset retirement obligations, geological and geophysical expenses, and exploration overhead amounts.

The amount and allocation of our future capital expenditures will depend upon a number of factors, including the number and size of any acquisitions, our cash flows from operating, investing, and financing activities, and our ability to assimilate acquisitions and execute our drilling program. In addition, the impact of oil, gas, and NGL prices on investment opportunities, the availability of capital, and the timing and results of our exploration and development activities may lead to changes in funding requirements for future development. We periodically review our capital expenditure budget to assess changes in current and projected cash flows, acquisition and divestiture activities, debt requirements, and other factors.

We may from time to time repurchase certain amounts of our outstanding debt securities for cash and/or through exchanges for other securities. Such repurchases or exchanges may be made in open market transactions, privately negotiated transactions, or otherwise. Any such repurchases or exchanges will depend on prevailing market conditions, our liquidity requirements, contractual restrictions, compliance with securities laws, and other factors. The amounts involved in any such transaction may be material. Repurchases or exchanges are reviewed as part of the allocation of our capital. On June 15, 2018, we announced that we would be calling for redemption all of our 2021 Senior Notes. On July 16, 2018, we completed the 2021 Senior Notes Redemption which resulted in the payment of total consideration, including accrued interest, of $355.9 million. As part of our strategy for 2018, we continue to focus on opportunities for improving our debt metrics. Please refer to Note 5 - Long-Term Debt in Part I, Item 1 of this report for additional discussion.

As of the filing of this report, we could repurchase up to 3,072,184 shares of our common stock under our stock repurchase program, subject to the approval of our Board of Directors. Shares may be repurchased from time to time in the open market, or in privately negotiated transactions, subject to market conditions and other factors, including certain provisions of our Credit Agreement, the indentures governing our Senior Notes, the indenture governing our Senior Convertible Notes, compliance with securities laws, and the terms and provisions of our stock repurchase program. Our Board of Directors periodically reviews this program as part of the allocation of our capital. We currently do not plan to repurchase any outstanding shares of common stock during 2018.

Analysis of Cash Flow Changes Between the Six Months Ended June 30, 2018, and 2017

The following tables present changes in cash flows between the six months ended June 30, 2018, and 2017, for our operating, investing, and financing activities. The six months ended June 30, 2017, have been adjusted to conform to the current period presentation. Please refer to Note 1 - Summary of Significant Accounting Policies in Part I, Item 1 of this report for additional discussion of adjustments made as a result of adopting new accounting standards. The analysis following each table should be read in conjunction with our accompanying statements of cash flows in Part I, Item 1 of this report.

Operating activities

	For the Six Months Ended   June 30,
	2018		2017
	(in millions)
Net cash provided by operating activities	$	311.5	$	242.1

Cash received from oil, gas, and NGL production revenues, net of transportation costs and production taxes, including derivative cash settlements, increased $54.1 million for the six months ended June 30, 2018, compared with the same period in 2017, primarily as a result of an increase in our realized price, after the effects of derivative settlements. Net cash provided by operating activities is affected by working capital changes and the timing of cash receipts and disbursements.

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Investing activities

	For the Six Months Ended   June 30,
	2018			2017
	(in millions)
Net cash provided by (used in) investing activities	$	(5.7	)	$	311.4

The decrease in cash flows from investing activities for the six months ended June 30, 2018, compared with the same period in 2017 is largely due to an increase in capital expenditures of $356.6 million, partially offset by a $63.5 million decrease in acquisition expenditures. The overall increase is due to higher capital expenditures in our Midland Basin program as compared with the same period in 2017. Further, divestiture cash proceeds received in the first half of 2018 decreased $24.0 million, compared with the same period in 2017.

Financing activities

	For the Six Months Ended   June 30,
	2018			2017
	(in millions)
Net cash used in financing activities	$	(3.8	)	$	(6.3	)

Cash used in financing activities is primarily the result of $5.6 million of dividends paid during the six months ended June 30, 2018, and 2017, respectively.

Interest Rate Risk

We are exposed to market risk due to the floating interest rate associated with any outstanding balance on our revolving credit facility. As of June 30, 2018, and through the filing of this report, we had a zero balance on our credit facility. Our Credit Agreement allows us to fix the interest rate for all or a portion of the principal balance of our revolving credit facility for a period of up to six months. Changes in interest rates do not impact the amount of interest we pay on our fixed-rate Senior Notes or fixed-rate Senior Convertible Notes, but can impact their fair market values. As of June 30, 2018, our outstanding fixed-rate debt totaled $3.0 billion. On July 16, 2018, we completed the 2021 Senior Notes Redemption, which reduced our outstanding fixed-rate debt total to $2.6 billion. Please refer to Note 5 - Long-Term Debt and Note 11 - Fair Value Measurements in Part I, Item 1 of this report for additional discussion of the 2021 Senior Notes Redemption and the fair values of our Senior Notes and Senior Convertible Notes.

Commodity Price Risk

The prices we receive for our oil, gas, and NGL production directly impact our revenue, overall profitability, access to capital, and future rate of growth. Oil, gas, and NGL prices are subject to wide fluctuations in response to changes in supply and demand and other factors. The markets for oil, gas, and NGLs have been volatile, especially over the last several years, and these markets will likely continue to be volatile in the future. The prices we receive for our production depend on numerous factors beyond our control. Based on our production for the six months ended June 30, 2018, a 10 percent decrease in our average realized oil, gas, and NGL prices, before the effects of derivative settlements, would have reduced our oil, gas, and NGL production revenues by approximately $52.7 million, $16.3 million, and $9.5 million, respectively. If commodity prices had been 10 percent lower, our net derivative settlements for the six months ended June 30, 2018, would have offset the declines in oil, gas, and NGL production revenues by approximately $51.8 million.

We enter into commodity derivative contracts in order to reduce the impact of fluctuations in commodity prices. The fair value of our commodity derivative contracts are largely determined by estimates of the forward curves of the relevant price indices. As of June 30, 2018, a 10 percent increase or decrease in the forward curves associated with our oil, gas, and NGL commodity derivative instruments would have changed our net liability positions by approximately $102.2 million, $20.5 million, and $24.4 million, respectively.

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Off-Balance Sheet Arrangements

As part of our ongoing business, we have not participated in transactions that generate relationships with unconsolidated entities or financial partnerships, such as entities often referred to as structured finance or special purpose entities (“SPEs”), which would have been established for the purpose of facilitating off-balance sheet arrangements or other contractually narrow or limited purposes.

We evaluate our transactions to determine if any variable interest entities exist. If we determine that we are the primary beneficiary of a variable interest entity, that entity is consolidated into our consolidated financial statements. We have not been involved in any unconsolidated SPE transactions during the six months ended June 30, 2018, or through the filing of this report.

Critical Accounting Policies and Estimates

Please refer to the corresponding section in Part II, Item 7 and to Note 1 - Summary of Significant Accounting Policies included in Part II, Item 8 of our 2017 Form 10-K for discussion of our accounting policies and estimates.

New Accounting Pronouncements

Please refer to Note 1 - Summary of Significant Accounting Policies under Part I, Item 1 of this report for new accounting pronouncements.

Non-GAAP Financial Measures

Adjusted EBITDAX represents net income (loss) before interest expense, interest income, income taxes, depletion, depreciation, amortization and asset retirement obligation liability accretion expense, exploration expense, property abandonment and impairment expense, non-cash stock-based compensation expense, derivative gains and losses net of settlements, gains and losses on divestitures, gains and losses on extinguishment of debt, and certain other items. Adjusted EBITDAX excludes certain items that we believe affect the comparability of operating results and can exclude items that are generally one-time in nature or whose timing and/or amount cannot be reasonably estimated. Adjusted EBITDAX is a non-GAAP measure that we present because we believe it provides useful additional information to investors and analysts, as a performance measure, for analysis of our ability to internally generate funds for exploration, development, acquisitions, and to service debt. We are also subject to financial covenants under our Credit Agreement based on adjusted EBITDAX ratios as further described in Credit Agreement in Overview of Liquidity and Capital Resources above. In addition, adjusted EBITDAX is widely used by professional research analysts and others in the valuation, comparison, and investment recommendations of companies in the oil and gas exploration and production industry, and many investors use the published research of industry research analysts in making investment decisions. Adjusted EBITDAX should not be considered in isolation or as a substitute for net income (loss), income (loss) from operations, net cash provided by operating activities, or other profitability or liquidity measures prepared under GAAP. Because adjusted EBITDAX excludes some, but not all, items that affect net income (loss) and may vary among companies, the adjusted EBITDAX amounts presented may not be comparable to similar metrics of other companies. Our credit facility provides a material source of liquidity for us. Under the terms of our Credit Agreement, if we failed to comply with the covenants that establish a maximum permitted ratio of senior secured debt to adjusted EBITDAX and a minimum permitted ratio of adjusted EBITDAX to interest, we would be in default, an event that would prevent us from borrowing under our credit facility and would therefore materially limit our sources of liquidity. In addition, if we are in default under our credit facility and are unable to obtain a waiver of that default from our lenders, lenders under that facility and under the indentures governing our outstanding Senior Notes and Senior Convertible Notes would be entitled to exercise all of their remedies for default.

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The following table provides reconciliations of our net income (loss) (GAAP) and net cash provided by operating activities (GAAP) to adjusted EBITDAX (non-GAAP) for the periods presented:

	For the Three Months Ended   June 30,						For the Six Months Ended   June 30,
	2018			2017			2018			2017
	(in thousands)
Net income (loss) (GAAP)	$	17,197		$	(119,907	)	$	334,598		$	(45,473	)
Interest expense	41,654			44,595			84,739			91,548
Interest income (1)	(2,414		)	(1,265		)	(3,263		)	(1,600		)
Income tax expense (benefit)	(901		)	(71,061		)	98,090			(26,555		)
Depletion, depreciation, amortization, and asset retirement obligation liability accretion	151,765			153,232			282,238			291,044
Exploration (2) (3)	12,867			11,988			25,278			22,397
Abandonment and impairment of unproved properties	11,935			157			17,560			157
Stock-based compensation expense	5,264			4,358			10,676			9,813
Net derivative (gain) loss	63,749			(55,189		)	71,278			(169,963		)
Derivative settlement gain (loss)	(36,665		)	16,303			(61,193		)	16,310
Net (gain) loss on divestiture activity	(39,501		)	167,133			(424,870		)	129,670
Loss on extinguishment of debt	—			—			—			35
Other, net	2			3,655			9			8,641
Adjusted EBITDAX (non-GAAP) (3)	224,952			153,999			435,140			326,024
Interest expense	(41,654		)	(44,595		)	(84,739		)	(91,548		)
Interest income (1)	2,414			1,265			3,263			1,600
Income tax (expense) benefit	901			71,061			(98,090		)	26,555
Exploration (2) (3)	(12,867		)	(11,988		)	(25,278		)	(22,397		)
Amortization of debt discount and deferred financing costs	3,884			3,733			7,750			8,679
Deferred income taxes	(861		)	(64,015		)	97,505			(30,790		)
Other, net (3)	223			(2,567		)	(2,311		)	(4,177		)
Net change in working capital	(5,609		)	256			(21,722		)	28,182
Net cash provided by operating activities (GAAP) (3)	$	171,383		$	107,149		$	311,518		$	242,128

____________________________________________

⁽¹⁾  Interest income is included within the other non-operating income, net line item on the accompanying statements of operations in Part I, Item 1 of this report.

⁽²⁾  Stock-based compensation expense is a component of exploration expense and general and administrative expense on the accompanying statements of operations. Therefore, the exploration line items shown in the reconciliation above will vary from the amount shown on the accompanying statements of operations for the component of stock-based compensation expense recorded to exploration expense.

⁽³⁾  Certain prior period amounts have been adjusted to conform to the current period presentation on the condensed consolidated financial statements. Please refer to Note 1 - Summary of Significant Accounting Policies in Part I, Item 1 of this report for additional discussion.

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Cautionary Information about Forward-Looking Statements

This report contains “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended (the “Securities Act”), and Section 21E of the Securities Exchange Act of 1934, as amended (the “Exchange Act”). All statements, other than statements of historical facts, included in this report that address activities, events, or developments with respect to our financial condition, results of operations, or economic performance that we expect, believe, or anticipate will or may occur in the future, or that address plans and objectives of management for future operations, are forward-looking statements. The words “anticipate,” “assume,” “believe,” “budget,” “estimate,” “expect,” “forecast,” “intend,” “pending,” “plan,” “project,” “will,” and similar expressions are intended to identify forward-looking statements. Forward-looking statements appear throughout this report, and include statements about such matters as:

• the amount and nature of future capital expenditures and the availability of liquidity and capital resources to fund capital expenditures;

• our outlook on future oil, gas, and NGL prices, well costs, and service costs;

• the drilling of wells and other exploration and development activities and plans, as well as possible or expected acquisitions or divestitures;

• proved reserve estimates and the estimates of both future net revenues and the present value of future net revenues associated with those reserve estimates;

• future oil, gas, and NGL production estimates;

• cash flows, anticipated liquidity, and the future repayment of debt;

• business strategies and other plans and objectives for future operations, including plans for expansion and growth of operations or to defer capital investment, and our outlook on our future financial condition or results of operations;

• the possible divestiture or farm-down of, or joint venture relating to, certain properties; and

• other similar matters such as those discussed in the Management’s Discussion and Analysis of Financial Condition and Results of Operations section in Part I, Item 2 of this report.

Our forward-looking statements are based on assumptions and analyses made by us in light of our experience and our perception of historical trends, current conditions, expected future developments, and other factors that we believe are appropriate under the circumstances. These statements are subject to a number of known and unknown risks and uncertainties, which may cause our actual results and performance to be materially different from any future results or performance expressed or implied by the forward-looking statements. Some of these risks are described in the Risk Factors section in Part I, Item 1A of our 2017 Form 10-K, and include such factors as:

• the volatility of oil, gas, and NGL prices, and the effect it may have on our profitability, financial condition, cash flows, access to capital, and ability to grow production volumes and/or proved reserves;

• weakness in economic conditions and uncertainty in financial markets;

• our ability to replace reserves in order to sustain production;

• our ability to raise the substantial amount of capital required to develop and/or replace our reserves;

• our ability to compete against competitors that have greater financial, technical, and human resources;

• our ability to attract and retain key personnel;

• the imprecise estimations of our actual quantities and present value of proved oil, gas, and NGL reserves;

• the uncertainty in evaluating recoverable reserves and estimating expected benefits or liabilities;

• the possibility that exploration and development drilling may not result in commercially producible reserves;

• our limited control over activities on outside-operated properties;

• our reliance on the skill and expertise of third-party service providers on our operated properties;

• the possibility that title to properties in which we claim an interest may be defective;

• our planned drilling in existing or emerging resource plays using some of the latest available horizontal drilling and completion techniques is subject to drilling and completion risks and may not meet our expectations for reserves or production;

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• the uncertainties associated with acquisitions, divestitures, joint ventures, farm-downs, farm-outs and similar transactions with respect to certain assets, including whether such transactions will be consummated or completed in the form or timing and for the value that we anticipate;

• the uncertainties associated with enhanced recovery methods;

• our commodity derivative contracts may result in financial losses or may limit the prices we receive for oil, gas, and NGL sales;

• the inability of one or more of our service providers, customers, or contractual counterparties to meet their obligations;

• our ability to deliver required quantities of oil, gas, NGLs, or produced water to contractual counterparties;

• price declines or unsuccessful exploration efforts resulting in write-downs of our asset carrying values;

• the impact that depressed oil, gas, or NGL prices could have on our borrowing capacity under our Credit Agreement;

• the possibility our amount of debt may limit our ability to obtain financing for acquisitions, make us more vulnerable to adverse economic conditions, and make it more difficult for us to make payments on our debt;

• the possibility that covenants in our Credit Agreement or the indentures governing the Senior Notes and Senior Convertible Notes may limit our discretion in the operation of our business, prohibit us from engaging in beneficial transactions, or lead to the accelerated payment of our debt;

• operating and environmental risks and hazards that could result in substantial losses;

• the impact of extreme weather conditions on our ability to conduct drilling activities;

• our ability to acquire adequate supplies of water and dispose of or recycle water we use at a reasonable cost in accordance with environmental and other applicable rules;

• complex laws and regulations, including environmental regulations, that result in substantial costs and other risks;

• the availability and capacity of gathering, transportation, processing, and/or refining facilities;

• our ability to sell and/or receive market prices for our oil, gas, and NGLs;

• new technologies may cause our current exploration and drilling methods to become obsolete;

• the possibility of security threats, including terrorist attacks and cybersecurity attacks and breaches, against, or otherwise impacting, our facilities and systems; and

• litigation, environmental matters, the potential impact of legislation and government regulations, and the use of management estimates regarding such matters.

We caution you that forward-looking statements are not guarantees of future performance and actual results or performance may be materially different from those expressed or implied in the forward-looking statements. The forward-looking statements in this report speak as of the filing of this report. Although we may from time to time voluntarily update our prior forward-looking statements, we disclaim any commitment to do so except as required by securities laws.

ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

The information required by this item is provided under the captions Commodity Price Risk and Interest Rate Risk in Item 2 above, as well as under the section entitled Summary of Oil, Gas, and NGL Derivative Contracts in Place under Note 10 - Derivative Financial Instruments in Part I, Item 1 of this report and is incorporated herein by reference. Please also refer to the information under Commodity Price RiskandInterest Rate Risk in Management’s Discussion and Analysis of Financial Condition and Results of Operations in Part II, Item 7 of our 2017 Form 10-K.

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ITEM 4. CONTROLS AND PROCEDURES

Evaluation of Disclosure Controls and Procedures

We maintain a system of disclosure controls and procedures that are designed to reasonably ensure that information required to be disclosed in our SEC reports is recorded, processed, summarized, and reported within the time periods specified in the SEC’s rules and forms, and to reasonably ensure that such information is accumulated and communicated to our management, including the Chief Executive Officer and the Chief Financial Officer, as appropriate, to allow for timely decisions regarding required disclosure.

Our management, including our Chief Executive Officer and Chief Financial Officer, does not expect that our disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) of the Exchange Act) (“Disclosure Controls”) will prevent all errors and all fraud. A control system, no matter how well conceived and operated, can provide only reasonable, not absolute, assurance that the objectives of the control system are met. Further, the design of a control system must reflect the fact that there are resource constraints, and the benefits of controls must be considered relative to their costs. Because of the inherent limitations in all control systems, no evaluation of controls can provide absolute assurance that all control issues and instances of fraud, if any, within our company have been detected. These inherent limitations include the realities that judgments in decision-making can be faulty, and that breakdowns can occur because of simple error or mistake. Additionally, controls can be circumvented by the individual acts of some persons, by collusion of two or more people, or by management override of the control. The design of any system of controls also is based in part upon certain assumptions about the likelihood of future events and there can be no assurance that any design will succeed in achieving its stated goals under all potential future conditions. Because of the inherent limitations in a cost-effective control system, misstatements due to error or fraud may occur and not be detected. We monitor our Disclosure Controls and make modifications as necessary; our intent in this regard is that the Disclosure Controls will be modified as systems change and conditions warrant.

An evaluation of the effectiveness of the design and operation of our Disclosure Controls was performed as of the end of the period covered by this report. This evaluation was performed under the supervision and with the participation of our management, including our Chief Executive Officer and Chief Financial Officer. Based upon that evaluation, our Chief Executive Officer and Chief Financial Officer concluded that our Disclosure Controls are effective at a reasonable assurance level.

Changes in Internal Control Over Financial Reporting

There have been no changes during the second quarter of 2018 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

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PART II. OTHER INFORMATION

ITEM 1. LEGAL PROCEEDINGS

From time to time, we may be involved in litigation relating to claims arising out of our business and operations in the normal course of business. As of the filing of this report, no legal proceedings are pending against us that we believe individually or collectively are expected to have a materially adverse effect upon our financial condition, results of operations or cash flows.

ITEM 1A. RISK FACTORS

There have been no material changes to the risk factors as previously disclosed in our 2017 Form 10-K.

ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

The following table provides information about purchases made by us and any affiliated purchaser (as defined in Rule 10b-18(a)(3) under the Exchange Act) during the quarter ended June 30, 2018, of shares of our common stock, which is the sole class of equity securities registered by us pursuant to Section 12 of the Exchange Act:

PURCHASES OF EQUITY SECURITIES BY ISSUER AND AFFILIATED PURCHASERS

Period	Total Number of Shares Purchased (1)	Weighted Average Price Paid per Share		Total Number of Shares Purchased as Part of Publicly Announced Program	Maximum Number of Shares that May Yet Be Purchased Under the Program (2)
04/01/18 - 04/30/18	—	$	—	—	3,072,184
05/01/18 - 05/31/18	355	$	26.64	—	3,072,184
06/01/18 - 06/30/18	—	$	—	—	3,072,184
Total:	355	$	26.64	—	3,072,184

____________________________________________

⁽¹⁾  All shares purchased by us in the second quarter of 2018 were to offset tax withholding obligations that occurred upon the delivery of outstanding shares underlying RSUs delivered under the terms of grants under the Equity Incentive Compensation Plan.

⁽²⁾  In July 2006, our Board of Directors approved an increase in the number of shares that may be repurchased under the original August 1998 authorization to 6,000,000 as of the effective date of the resolution. Accordingly, as of the filing of this report, subject to the approval of our Board of Directors, we may repurchase up to 3,072,184 shares of common stock on a prospective basis. The shares may be repurchased from time to time in open market transactions or privately negotiated transactions, subject to market conditions and other factors, including certain provisions of our Credit Agreement, the indentures governing our Senior Notes and Senior Convertible Notes, and compliance with securities laws. Stock repurchases may be funded with existing cash balances, internal cash flows, or borrowings under our Credit Agreement. The stock repurchase program may be suspended or discontinued at any time.

Our payment of cash dividends to our stockholders is subject to covenants under the terms of our Credit Agreement that limit our annual dividend payments to no more than $50.0 million per year. We are also subject to certain covenants under the indentures governing our Senior Notes and Senior Convertible Notes that restrict certain payments, including dividends; however, the first $6.5 million of dividends paid each year are not restricted by these covenants. Based on our current performance, we do not anticipate that these covenants will limit our payment of dividends at our current rate for the foreseeable future if any dividends are declared by our Board of Directors.

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ITEM 6. EXHIBITS

The following exhibits are filed or furnished with or incorporated by reference into this report:

Exhibit Number	Description
2.1	Purchase and Sale Agreement, dated January 8, 2018, by and between SM Energy Company and Converse Energy Acquisitions, LLC (filed as Exhibit 2.1 to the registrant’s Current Report on Form 8-K filed on January 11, 2018, and incorporated herein by reference)
3.1	Restated Certificate of Incorporation of SM Energy Company, as amended through June 1, 2010 (filed as Exhibit 3.1 to the registrant’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2010, and incorporated herein by reference)
3.2	Amended and Restated By-Laws of SM Energy Company, effective as of February 21, 2017 (filed as Exhibit 3.2 to the registrant’s Annual Report on Form 10-K for the year ended December 31, 2016, and incorporated herein by reference)
4.1†	SM Energy Company Equity Incentive Compensation Plan, amended and restated effective as of May 22, 2018 (filed as Annex A in the registrant’s Definitive Proxy Statement on Schedule 14A, filed on April 12, 2018, and incorporated herein by reference)
10.1*†	Performance Share Unit Award Agreement as of July 1, 2018
12.1*	Computation of Ratio of Earnings to Fixed Charges
31.1*	Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes - Oxley Act of 2002
31.2*	Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes - Oxley Act of 2002
32.1**	Certification pursuant to 18 U.S.C. Section 1350 as adopted pursuant to Section 906 of the Sarbanes - Oxley Act of 2002
101.INS*	XBRL Instance Document
101.SCH*	XBRL Schema Document
101.CAL*	XBRL Calculation Linkbase Document
101.LAB*	XBRL Label Linkbase Document
101.PRE*	XBRL Presentation Linkbase Document
101.DEF*	XBRL Taxonomy Extension Definition Linkbase Document

_____________________________________

*	Filed with this report.
**	Furnished with this report.
†	Exhibit constitutes a management contract or compensatory plan or agreement.

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

	SM ENERGY COMPANY
August 2, 2018	By:	/s/ JAVAN D. OTTOSON
		Javan D. Ottoson
		President and Chief Executive Officer
		(Principal Executive Officer)
August 2, 2018	By:	/s/ A. WADE PURSELL
		A. Wade Pursell
		Executive Vice President and Chief Financial Officer
		(Principal Financial Officer)
August 2, 2018	By:	/s/ MARK T. SOLOMON
		Mark T. Solomon
		Vice President - Controller and Assistant Secretary
		(Principal Accounting Officer)

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EX-10.1

EXHIBIT 10.1

SM ENERGY COMPANY

PERFORMANCE SHARE UNIT AWARD AGREEMENT

This Performance Share Unit Award Agreement (the “Agreement”) is made effective as of [___], 20[___] (the “Award Date”), by and between SM Energy Company, a Delaware corporation (the “Company”) and[___](the “Participant”) to whom performance share units have been awarded under the Company’s Equity Incentive Compensation Plan, as amended (the “Plan”).

Pursuant to the terms of the Plan and this Agreement, as of the Award Date, the Company makes an award (the “Award”) to the Participant of[___]performance share units (the “Performance Units”). Capitalized terms used but not defined in this Agreement shall have the meanings given to them in the Plan.

ARTICLE I

PERFORMANCE UNITS

1.1Performance Units and Performance Period. The Performance Units represent the right to receive, upon the payment of the Performance Units pursuant to Section 1.4 hereof after the completion of the Performance Period (as defined below), a number of shares of the Company’s common stock, $.01 par value per share (sometimes referred to herein as the “Common Stock”), that will be calculated as set forth in Section 1.2 below based on the extent to which the Company’s Performance Criteria (as defined in Section 1.2) have been achieved and the extent to which the Performance Units have vested. Any Common Stock that is issued pursuant to any provision of this Agreement may be referred to in this Agreement as a “Share” or “Shares.” Such actual number of Shares that may be issued upon payment of the Performance Units may be from zero (0) to two (2.0) times the number of Performance Units granted on the Award Date. The number of Performance Units granted herein may be referred to as the “target” number of Shares. The performance period (the “Performance Period”) for the Performance Units shall be the three-year period beginning on [___], 20[___], and ending on [___], 20[___]. Performance Units are intended to be Performance Shares as defined in the Plan.

1.2Determination of Number of Shares Earned.

(a)Performance Criteria. The actual number of Shares that may be earned from the Performance Units and issued upon payment of the Performance Units after completion of the Performance Period shall be based upon the Company’s achievement of performance criteria (the “Performance Criteria”) established by the Compensation Committee of the Board of Directors of the Company (the “Committee”) for the Performance Period in accordance with the terms of the Plan and as set forth below and reflected in the payout matrix (the “Payout Matrix”) attached as Appendix A hereto and discussed further in subsection (d) hereof. The Performance Criteria for the calculation of the actual number of Shares to be issued upon payment of the Performance

Units as reflected in the Payout Matrix are based on a combination of (i) the relative measure of the Company’s cumulative total shareholder return (“TSR”) and associated Compound Annual Growth Rate (“CAGR”) for the Performance Period compared with the cumulative TSR and CAGR of the Peer Companies (as defined below) for the Performance Period; and (ii) the relative measure of the Company’s debt adjusted per share cash flow growth (“DACFG”) for the Performance Period compared with the DACFG for the Peer Companies for the Performance Period.

(b)Calculation of TSR, CAGR and DACFG. The TSR and CAGR of the Company and the Peer Companies and the DACFG of the Company and the Peer Companies, each for the Performance Period shall be calculated in accordance with the methodology adopted by the Committee in its sole discretion.

(c)Peer Companies. The “Peer Companies” shall consist of those exploration and production companies selected by the Committee in its sole discretion at the initiation of the Performance Period, as such group may be modified from time to time during the Performance Period by the Committee in its sole discretion.

(d)Payout Matrix. The Payout Matrix attached as Appendix A hereto sets forth the possible multipliers, which range from zero percent (0%) to two hundred percent (200%), which may be applied to the number of vested Performance Units to determine the actual number of Shares to be issued upon payment of the vested Performance Units after the completion of the Performance Period. The final multiplier (the “Final Multiplier”) shall be determined by the Committee after the completion of the Performance Period based on the two variables that comprise the Performance Criteria, related to (i) the Company’s TSR and CAGR for the Performance Period relative to the Peer Companies’ TSR and CAGR for the Performance Period, and (ii) the Company’s DACFG for the Performance Period relative to the Peer Companies’ DACFG for the Performance Period. Subject to Section 1.2(e), the number of Shares, if any, that shall be issued to the Participant upon payment of the Performance Units shall be calculated as an amount equal to (A) the number of Performance Units that have vested in accordance with Section 1.3 or Section 1.6 hereof, multiplied by (B) the Final Multiplier, as determined by the Committee in accordance with the Payout Matrix (such number of Shares, the “Payout Shares”). Any fractional Shares which would otherwise result from application of the Final Multiplier shall be rounded up to the nearest whole Share of Common Stock.

(e)Payout Value Limit. Notwithstanding any other provision of this Agreement, under no circumstances shall (i) the product of (A) the number of Payout Shares as calculated in accordance with the Payout Matrix under the provisions of Section 1.2(d), multiplied by (B) the per share closing price of the Company’s Common Stock on [___], 20[___], as reported by the principal exchange or market on which the Company’s Common Stock is then traded (the “Payout Closing Price”) (with such product referred to as the “Payout Matrix Value”), exceed (ii) the product of (C) the number of Performance Units multiplied by (D) $[___] (with such product referred to as

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the “Payout Value Limit”). If the Payout Matrix Value would otherwise exceed the Payout Value Limit, then the number of Payout Shares shall be reduced to an amount equal to (x) the Payout Value Limit divided by (y) the Payout Closing Price, with any fractional Shares that would otherwise result from such computation to be rounded up to the nearest whole Share of Common Stock.

1.3Vesting of Performance Units.

(a)Vesting. Subject to the provisions contained herein, the Performance Units shall fully vest on [___], 20[___] (the “PSU Vesting Schedule”). In addition, the Performance Units may become fully vested or be forfeited under certain circumstances specified in this Agreement. As of the Award Date, the Participant must be an employee of the Company or a subsidiary thereof. If the Participant ceases to be an employee of the Company or a subsidiary thereof prior to the vesting of all of the Performance Units pursuant to the PSU Vesting Schedule, the Participant shall forfeit the unvested Performance Units under the Award, except as otherwise provided in this Section 1.3 and Section 1.6.

(b)Acceleration Upon Death or Total Disability. The Performance Units shall become fully vested, notwithstanding any other provisions of this Section 1.3, upon termination of the Participant’s employment with the Company or a subsidiary thereof because of death or Total Disability (as defined below). Any such acceleration of the vesting of the Performance Units pursuant to this Section 1.3(b) will not result in an acceleration of the PSU Payment Date, because the number of Shares earned from the Performance Units shall be calculated after the completion of the Performance Period. For purposes of this Agreement, “Total Disability” means a medically determinable physical or mental impairment that can be expected to result in death or can be expected to last for a continuous period of not less than 12 months, by reason of which the Participant is unable to engage in any substantial gainful activity or is receiving income replacement benefits for a period of not less than three months under an accident and health plan covering employees of the Company.

(c)Pro Rata Vesting. If the Participant is at least age 62 as of the Award Date, then notwithstanding Section 1.3(a), the Performance Units shall vest as follows (the “Pro Rata Vesting Schedule”):

January 1, 20[___]        1/6^th 

July 1, 20[___]        1/6^th 

January 1, 20[___]        1/6^th 

July 1, 20[___]        1/6^th 

January 1, 20[___]        1/6^th 

July 1, 20[___]        1/6^th 

If the Participant ceases to be an employee of the Company or a subsidiary thereof prior to the vesting of all of the Performance Units pursuant to this Section 1.3(c), the

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Participant shall forfeit all unvested Performance Units under the Award, except as otherwise provided in this Section 1.3 and Section 1.6.

(d)Termination for Cause. Notwithstanding any other provisions of this Section 1.3, the Participant shall forfeit all the Performance Units under this Award upon the termination of the employment of the Participant by the Company or a subsidiary thereof prior to the completion of the Performance Period for cause, which term is specifically not capitalized as such term is in Section 1.6(a) of this Agreement, it being the specific intent of the Company and the Participant that “cause” in this instance shall be broadly defined as any event, action, or inaction by or attributed to the Participant that could reasonably be the basis for an employer to terminate the employment of the affected individual.

1.4Payment of Performance Units. Following the last day of the Performance Period and prior to the payment of the earned and vested Performance Units on or about the PSU Payment Date, the Committee shall determine, (i) the extent to which the Performance Criteria have been achieved over the Performance Period, and (ii) the Final Multiplier. Subject to Section 1.2(e), the Final Multiplier shall then be applied to the number of vested Performance Units to determine the number of Payout Shares (also sometimes referred to herein as the “Earned Shares”), if any, to be issued to the Participant in payment of the Performance Units. The determination of the Earned Shares by the Committee shall be binding on the Participant and conclusive for all purposes. The Earned Shares, if any, shall be issued to the Participant in payment of the Performance Units on or about [___], 20[___] (the “PSU Payment Date”). Upon the payment of the Performance Units, the Company shall deliver to the Participant evidence of book-entry Shares or a certificate for the number of Shares issued to the Participant in payment of the Performance Units. The Earned Shares shall not be subject to any holding or transfer restrictions after payment of the Performance Units.

1.5Transfer Restrictions for Unpaid Performance Units. Performance Units that have not been paid shall not be transferable by the Participant, and the Participant shall not be permitted to sell, transfer, pledge, assign, or otherwise alienate or encumber such Performance Units or the Shares issuable in payment thereof, other than (i) to the person or persons to whom the Participant’s rights under such Performance Units pass by will or the laws of descent and distribution, (ii) to the spouse or the descendants of the Participant or to trusts for such persons to whom or which the Participant may transfer such Performance Units by gift, (iii) to the legal representative of any of the foregoing, or (iv) pursuant to a qualified domestic relations order as defined under Section 414(p) of the Internal Revenue Code of 1986, as amended (the “Code”) or a similar order or agreement pursuant to state domestic relations law (including a community property law) relating to the provision of child support, alimony payments, or marital property rights to a spouse, former spouse, child, or other dependent of the Participant. Any such transfer shall be made only in compliance with the Securities Act of 1933 and the requirements therefor as set forth by the Company. Any attempted transfer in contravention of the foregoing provisions shall be null and void and of no effect.

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1.6Change of Control Termination.

(a)Vesting upon Change of Control Termination. Notwithstanding any other provision of this Agreement, the Performance Units shall become fully vested upon a Change of Control Termination. For purposes of this Agreement, a “Change of Control Termination” occurs upon the termination of the Participant’s employment with the Company or a subsidiary thereof in the event that (i) a Change of Control (as defined in the Plan) of the Company occurs, and (ii) the Participant’s employment with the Company or a subsidiary thereof is subsequently terminated without Cause (as defined below) or the Participant terminates his or her employment with the Company or a subsidiary thereof for Good Reason (as defined below), and such termination of employment occurs prior to the normal completion of vesting of the Performance Units at the end of the Performance Period. The normal vesting and payment provisions in Article I of this Agreement shall not be affected by the first sentence of this subsection if a Change of Control of the Company occurs but there is not also a Change of Control Termination with respect to the Participant’s employment with the Company or a subsidiary thereof on or before the PSU Payment Date. If the Participant has entered into a separate written Change of Control Executive Severance Agreement or Change of Control Severance Agreement (with either to be subsequently referred to herein as a “Change of Control Severance Agreement”) with the Company, the terms “Cause” and “Good Reason” used herein shall have the meanings set forth in such Change of Control Severance Agreement. If the Participant has not entered into a separate written Change of Control Severance Agreement, the terms “Cause” and “Good Reason” used herein shall have the meanings set forth in the Company’s Change of Control Severance Plan (the “Change of Control Severance Plan”).

(b)Payment upon Change of Control Termination. Notwithstanding any other provisions of this Agreement to the contrary, in the event of a Change of Control Termination with respect to the Participant’s employment with the Company or a subsidiary thereof as set forth in Section 1.6(a) above, the vested Performance Units shall be paid in accordance with this Section 1.6(b). In the event of a Change of Control Termination, the Committee shall determine the extent to which the Performance Criteria have been achieved and the Final Multiplier to apply to the vested Performance Units by utilizing the same method as set forth in Section 1.2 hereof; provided, however, that the Performance Period for the calculation of the TSR, CAGR and DACFG of the Company and the Peer Companies to obtain the Final Multiplier shall be shortened to end as of the effective date of the Change of Control. Subject to Section 1.2(e), the Final Multiplier shall then be applied to the number of vested Performance Units to calculate the number of Earned Shares, if any, that the Participant is entitled to in payment of the Performance Units. In the event of a Change of Control Termination, any Earned Shares shall be paid to the Participant in payment of the Performance Units either in Shares or in cash of equivalent value, as determined by the Committee or other duly authorized administrator of the Plan, in its discretion, within thirty (30) days following the effective date of the Change of Control Termination; provided, however, that the time and manner of such

5

payment shall comply with Section 409A of the Code as referred to in Section 2.11 of this Agreement.

ARTICLE II

GENERAL PROVISIONS

2.1Adjustments Upon Changes in Capitalization. In the event that a stock split, stock dividend, or other similar change in capitalization of the Company occurs, the number and kind of Shares that may be issued under this Agreement and that have not yet been issued shall be proportionately and appropriately adjusted.

2.2No Dividend Equivalents or Stockholder Rights Until Shares Issued. The Performance Units shall not be credited with Dividend Equivalents. In addition, the Participant shall have no voting, transfer, liquidation, or other rights of a holder of Shares with respect to the Performance Units until such time as Shares, if any, have been issued by the Company to the Participant in payment of the Performance Units. Until the Performance Units are paid or terminated, they will represent only bookkeeping entries by the Company to evidence unfunded and unsecured obligations of the Company.

2.3Notices. Any notice to the Participant relating to this Agreement shall be in writing and delivered in person or by mail, fax, or email transmission to the address or addresses on file with the Company. Any notice to the Company shall be addressed to it at its principal office, and be specifically directed to the attention of the Corporate Secretary. Anyone to whom a notice may be given under this Agreement may designate a new address by notice to that effect.

2.4Benefits of Agreement. This Agreement shall inure to the benefit of and be binding upon each successor of the Company and the Participant’s heirs, legal representatives, and permitted transferees. This Agreement and the Plan shall be the sole and exclusive source of any and all rights that the Participant and the Participant’s heirs, legal representatives, and permitted transferees may have with respect to this Award, the Performance Units, and the Plan.

2.5Resolution of Disputes. Any dispute or disagreement that arises under, or is a result of, or in any way relates to, the interpretation, construction, or applicability of this Agreement shall be resolved as determined by the Committee, or the Board of Directors of the Company (the “Board”), or by any other committee appointed by the Board for such purpose. Any determination made hereunder shall be final, binding, and conclusive for all purposes.

2.6Controlling Documents. The provisions of the Plan are hereby incorporated into this Agreement by reference. In the event of any inconsistency between this Agreement and the Plan, the Plan shall control.

2.7Amendments. This Agreement may be amended only by a written instrument executed by both the Company and the Participant.

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2.8No Right of Participant to Continued Employment. Nothing contained in this Agreement or the Plan shall confer on the Participant any right to continue to be employed by the Company or any subsidiary thereof, or shall limit the Company’s right to terminate the employment of the Participant at any time.

2.9Vesting Dates and Payment Dates. In the event that any vesting date, payment date, or any other measurement date with respect to this Award does not fall on a business day, such date shall be deemed to occur on the next following business day.

2.10Tax Withholding. The Company may make such provisions and take such steps as it deems necessary or appropriate for the withholding of any taxes that the Company is required by law or regulation of any governmental authority, whether Federal, state, or local, to withhold in connection with the Performance Units or Shares subject to this Agreement. The Participant shall elect, prior to any tax withholding event related to this Award and at a time when the Participant is not aware of any material nonpublic information about the Company and the Participant would be permitted to engage in a transaction in the Company’s securities under the Company’s Securities Trading Policy, whether the Participant will satisfy all or part of such tax withholding requirement by paying the taxes in cash or by having the Company withhold Shares having a fair market value equal to the minimum statutory withholding that may be imposed on the transaction (based on minimum statutory withholding rates for Federal, state, and local tax purposes, as applicable, that are applicable to such transaction). The Participant’s election shall be irrevocable, made in writing, signed by the Participant, and shall be subject to any restrictions or limitations that the Committee, in its sole discretion, deems appropriate. If Participant fails to make an election, the Company will withhold Shares having a fair market value equal to the minimum statutory withholding that may be imposed on the transaction, as provided above. For purposes of tax withholding pursuant to this Section 2.10, unless applicable laws and regulations dictate otherwise, the Company shall determine fair market value based on the closing price of a Share as reported on the New York Stock Exchange or other applicable public market on the business day immediately preceding the PSU Payment Date.

2.11Compliance with Section 409A of the Code. Notwithstanding any provision in this Agreement to the contrary, to the extent that this Agreement constitutes a nonqualified deferred compensation plan or arrangement to which Section 409A of the Code applies, the administration of this Award (including the time and manner of payments under the Award and this Agreement) shall comply with Section 409A of the Code. In connection therewith, any payment to the Participant with respect to the Award under this Agreement which Section 409A(a)(2)(B)(i) of the Code indicates may not be made before the date which is six months after the date of the Participant’s separation from employment service (the “Section 409A Six-Month Waiting Period”), as a result of the fact that the Participant is a specified key employee referred to in Section 409A(a)(2)(B)(i) of the Code, shall not occur or be made during the Section 409A Six-Month Waiting Period but rather shall be delayed, if such payment would otherwise occur during the Section 409A Six-Month Waiting Period, until the expiration of the Section 409A Six-Month Waiting Period. Except as provided under Section 1.3(a), the Participant will not be considered to have a termination of employment or separation from employment under this Agreement unless the termination of employment or separation from

7

employment constitutes a “separation from service” under Treasury Regulation Section 1.409A‑1(h).

2.12Personal Data. The Participant hereby consents to the collection, use, and transfer, in electronic or other form, of the Participant’s Personal Data by and among, as applicable, the Company and its affiliates for the exclusive purpose of implementing, administering, and managing the Participant’s participation in the Plan. The Company holds, or may receive from any agent designated by the Company, certain personal information about the Participant, including, but not limited to, the Participant’s name, home address and telephone number, date of birth, social security insurance number or other identification number, salary, nationality, job title, any shares of Common Stock held, details of this Award and any other rights to shares of Common Stock awarded, canceled, exercised, vested, unvested, or outstanding in the Participant’s favor, for the purpose of implementing, administering, and managing the Plan, including complying with applicable tax and securities laws (the “Personal Data”). The Personal Data may be transferred to any third parties assisting in the implementation, administration, and management of the Plan. The Participant authorizes such recipients of the Personal Data to receive, possess, use, retain, and transfer the Personal Data, in electronic or other form, for the purposes described above, and the Participant hereby releases the Company and its affiliates from any of the Participant’s claims related to the use or disclosure of such Personal Data. The Participant may, at any time, view the Personal Data, request additional information about the storage and processing of the Personal Data, require any necessary amendments to the Personal Data, or refuse or withdraw the consents herein, in any case without cost, by contacting the Corporate Secretary of the Company in writing. Any such refusal or withdrawal of the consents herein may affect the Participant’s ability to participate in the Plan.

2.13Electronic Delivery of Documents. The Company may, in its sole discretion, deliver any documents related to this Award, or any future awards that may be granted under the Plan, by electronic means, or request the Participant’s consent to participate in the Plan or other authorizations from the Participant in connection therewith by electronic means. The Participant hereby consents to receive such documents by electronic delivery and, if requested, to participate in the Plan through an on-line or electronic system established and maintained by the Company or another third party designated by the Company.

2.14Receipt of Award and Related Documents. The Participant hereby acknowledges the receipt, either directly or electronically, of the Award, a copy of the Plan, and a prospectus for the Plan.

2.15Execution and Counterparts. This Agreement may be executed in counterparts. Execution of this Agreement may be evidenced by any appropriate form of electronic signature or affirmative email or other electronic response attached to or logically associated with such written instrument, which is executed or adopted by a party with an indication of the intention by such party to execute or adopt such instrument for purposes of execution hereof.

* * * * *

8

IN WITNESS WHEREOF, the Company and the Participant have caused this Performance Stock Unit Award Agreement to be entered into effective as of the Award Date.

COMPANY:

SM ENERGY COMPANY,

a Delaware corporation

By: _________________________________________

Printed Name: [___]

Title: [___]

Date Signed: __________, 20[___]

PARTICIPANT:

Signature: __________________________________

Printed Name:

9

Appendix A

PSU Payout Matrix

	Relative Performance Table
		Peer Group Count																								DACFG and TSR Multipliers
		21		20		19		18		17		16		15		14		13		12		11		10		Peer Group Percentile	Multiplier
	1	100.00	%	100.00	%	100.00	%	100.00	%	100.00	%	100.00	%	100.00	%	100.00	%	100.00	%	100.00	%	100.00	%	100.00	%	0%	0.0
	2	95.00	%	94.80	%	94.50	%	94.20	%	93.80	%	93.40	%	92.90	%	92.40	%	91.70	%	91.00	%	90.00	%	88.90	%	5%	0.0
	3	90.00	%	89.50	%	88.90	%	88.30	%	87.50	%	86.70	%	85.80	%	84.70	%	83.40	%	81.90	%	80.00	%	77.80	%	10%	0.0
	4	85.00	%	84.30	%	83.40	%	82.40	%	81.30	%	80.00	%	78.60	%	77.00	%	75.00	%	72.80	%	70.00	%	66.70	%	15%	0.0
	5	80.00	%	79.00	%	77.80	%	76.50	%	75.00	%	73.40	%	71.50	%	69.30	%	66.70	%	63.70	%	60.00	%	55.60	%	20%	0.0
	6	75.00	%	73.70	%	72.30	%	70.60	%	68.80	%	66.70	%	64.30	%	61.60	%	58.40	%	54.60	%	50.00	%	44.50	%	25%	0.0
	7	70.00	%	68.50	%	66.70	%	64.80	%	62.50	%	60.00	%	57.20	%	53.90	%	50.00	%	45.50	%	40.00	%	33.40	%	30%	0.5
	8	65.00	%	63.20	%	61.20	%	58.90	%	56.30	%	53.40	%	50.00	%	46.20	%	41.70	%	36.40	%	30.00	%	22.30	%	35%	0.6
	9	60.00	%	57.90	%	55.60	%	53.00	%	50.00	%	46.70	%	42.90	%	38.50	%	33.40	%	27.30	%	20.00	%	11.20	%	40%	0.7
	10	55.00	%	52.70	%	50.00	%	47.10	%	43.80	%	40.00	%	35.80	%	30.80	%	25.00	%	18.20	%	10.00	%	0.00	%	45%	0.8
	11	50.00	%	47.40	%	44.50	%	41.20	%	37.50	%	33.40	%	28.60	%	23.10	%	16.70	%	9.10	%	0.00	%	NA		50%	0.9
	12	45.00	%	42.20	%	38.90	%	35.30	%	31.30	%	26.70	%	21.50	%	15.40	%	8.40	%	0.00	%	NA		NA		55%	1.0
	13	40.00	%	36.90	%	33.40	%	29.50	%	25.00	%	20.00	%	14.30	%	7.70	%	0.00	%	NA		NA		NA		60%	1.2
	14	35.00	%	31.60	%	27.80	%	23.60	%	18.80	%	13.40	%	7.20	%	0.00	%	NA		NA		NA		NA		65%	1.4
	15	30.00	%	26.40	%	22.30	%	17.70	%	12.50	%	6.70	%	0.00	%	NA		NA		NA		NA		NA		70%	1.6
	16	25.00	%	21.10	%	16.70	%	11.80	%	6.30	%	0.00	%	NA		NA		NA		NA		NA		NA		75%	1.8
	17	20.00	%	15.80	%	11.20	%	5.90	%	0.00	%	NA		NA		NA		NA		NA		NA		NA		80%	2.0
	18	15.00	%	10.60	%	5.60	%	0.00	%	NA		NA		NA		NA		NA		NA		NA		NA		85%	2.0
	19	10.00	%	5.30	%	0.00	%	NA		NA		NA		NA		NA		NA		NA		NA		NA		90%	2.0
	20	5.00	%	0.00	%	NA		NA		NA		NA		NA		NA		NA		NA		NA		NA		95%	2.0
	21	0.00	%	NA		NA		NA		NA		NA		NA		NA		NA		NA		NA		NA		100%	2.0
	Notes
	1	Peer group count excludes SM Energy

Payout Matrix
			Relative TSR
		0%	5%	10%	15%	20%	25%	30%	35%	40%	45%	50%	55%	60%	65%	70%	75%	80%	85%	90%	95%	100%
	0%	0.00	0.00	0.00	0.00	0.00	0.00	0.25	0.30	0.35	0.40	0.45	0.50	0.60	0.70	0.80	0.90	1.00	1.00	1.00	1.00	1.00
	5%	0.00	0.00	0.00	0.00	0.00	0.00	0.25	0.30	0.35	0.40	0.45	0.50	0.60	0.70	0.80	0.90	1.00	1.00	1.00	1.00	1.00
	10%	0.00	0.00	0.00	0.00	0.00	0.00	0.25	0.30	0.35	0.40	0.45	0.50	0.60	0.70	0.80	0.90	1.00	1.00	1.00	1.00	1.00
	15%	0.00	0.00	0.00	0.00	0.00	0.00	0.25	0.30	0.35	0.40	0.45	0.50	0.60	0.70	0.80	0.90	1.00	1.00	1.00	1.00	1.00
	20%	0.00	0.00	0.00	0.00	0.00	0.00	0.25	0.30	0.35	0.40	0.45	0.50	0.60	0.70	0.80	0.90	1.00	1.00	1.00	1.00	1.00
	25%	0.00	0.00	0.00	0.00	0.00	0.00	0.25	0.30	0.35	0.40	0.45	0.50	0.60	0.70	0.80	0.90	1.00	1.00	1.00	1.00	1.00
	30%	0.25	0.25	0.25	0.25	0.25	0.25	0.50	0.55	0.60	0.65	0.70	0.75	0.85	0.95	1.05	1.15	1.25	1.25	1.25	1.25	1.25
	35%	0.30	0.30	0.30	0.30	0.30	0.30	0.55	0.60	0.65	0.70	0.75	0.80	0.90	1.00	1.10	1.20	1.30	1.30	1.30	1.30	1.30
	40%	0.35	0.35	0.35	0.35	0.35	0.35	0.60	0.65	0.70	0.75	0.80	0.85	0.95	1.05	1.15	1.25	1.35	1.35	1.35	1.35	1.35
	45%	0.40	0.40	0.40	0.40	0.40	0.40	0.65	0.70	0.75	0.80	0.85	0.90	1.00	1.10	1.20	1.30	1.40	1.40	1.40	1.40	1.40
	50%	0.45	0.45	0.45	0.45	0.45	0.45	0.70	0.75	0.80	0.85	0.90	0.95	1.05	1.15	1.25	1.35	1.45	1.45	1.45	1.45	1.45
	55%	0.50	0.50	0.50	0.50	0.50	0.50	0.75	0.80	0.85	0.90	0.95	1.00	1.10	1.20	1.30	1.40	1.50	1.50	1.50	1.50	1.50
	60%	0.60	0.60	0.60	0.60	0.60	0.60	0.85	0.90	0.95	1.00	1.05	1.10	1.20	1.30	1.40	1.50	1.60	1.60	1.60	1.60	1.60
	65%	0.70	0.70	0.70	0.70	0.70	0.70	0.95	1.00	1.05	1.10	1.15	1.20	1.30	1.40	1.50	1.60	1.70	1.70	1.70	1.70	1.70
	70%	0.80	0.80	0.80	0.80	0.80	0.80	1.05	1.10	1.15	1.20	1.25	1.30	1.40	1.50	1.60	1.70	1.80	1.80	1.80	1.80	1.80
	75%	0.90	0.90	0.90	0.90	0.90	0.90	1.15	1.20	1.25	1.30	1.35	1.40	1.50	1.60	1.70	1.80	1.90	1.90	1.90	1.90	1.90
	80%	1.00	1.00	1.00	1.00	1.00	1.00	1.25	1.30	1.35	1.40	1.45	1.50	1.60	1.70	1.80	1.90	2.00	2.00	2.00	2.00	2.00
	85%	1.00	1.00	1.00	1.00	1.00	1.00	1.25	1.30	1.35	1.40	1.45	1.50	1.60	1.70	1.80	1.90	2.00	2.00	2.00	2.00	2.00
	90%	1.00	1.00	1.00	1.00	1.00	1.00	1.25	1.30	1.35	1.40	1.45	1.50	1.60	1.70	1.80	1.90	2.00	2.00	2.00	2.00	2.00
	95%	1.00	1.00	1.00	1.00	1.00	1.00	1.25	1.30	1.35	1.40	1.45	1.50	1.60	1.70	1.80	1.90	2.00	2.00	2.00	2.00	2.00
	100%	1.00	1.00	1.00	1.00	1.00	1.00	1.25	1.30	1.35	1.40	1.45	1.50	1.60	1.70	1.80	1.90	2.00	2.00	2.00	2.00	2.00
	Notes
	1	Interpolate linerally results, except below 30%
	2	If SM Energy's absolute TSR is negative, then Final Multiplier capped at 1.0

EX-12.1

EXHIBIT 12.1

SM ENERGY COMPANY AND SUBSIDIARIES

RATIO OF EARNINGS TO FIXED CHARGES

	For the Six Months Ended June 30,			For the Years Ended December 31,
	2018			2017			2016			2015			2014			2013
	(in thousands, except ratios)
Income (loss) before income taxes	$	432,688		$	(343,813	)	$	(1,201,916	)	$	(722,861	)	$	1,064,699		$	278,611
Fixed charges	96,078			193,587			167,600			155,510			117,147			102,758
Amortization of capitalized interest	5,017			11,623			13,905			9,116			11,448			11,784
Capitalized interest	(10,536		)	(12,607		)	(17,004		)	(25,051		)	(16,165		)	(10,952		)
Earnings before fixed charges	$	523,247		$	(151,210	)	$	(1,037,415	)	$	(583,286	)	$	1,177,129		$	382,201
Fixed charges:
Interest expense (1)	$	84,739		$	179,257		$	148,685		$	128,149		$	98,554		$	89,711
Capitalized interest	10,536			12,607			17,004			25,051			16,165			10,952
Interest expense component of rent (2)	803			1,723			1,911			2,310			2,428			2,095
Total fixed charges	$	96,078		$	193,587		$	167,600		$	155,510		$	117,147		$	102,758
Ratio of earnings to fixed charges	5.4			—			—			—			10.0			3.7
Insufficient coverage	$	—		$	344,797		$	1,205,015		$	738,796		$	—		$	—

___________________________________________

⁽¹⁾ Includes amortization of deferred financing costs and debt discount. Interest expense for the year ended December 31, 2016, excludes the $10.0 million paid to terminate a second lien facility that was no longer necessary to fund acquisition activity.

⁽²⁾ Represents a reasonable approximation of the portion of rental expense assumed to be attributable to the interest factor.

EX-31.1

EXHIBIT 31.1

CERTIFICATION

I, Javan D. Ottoson, certify that:

1. I have reviewed this quarterly report on Form 10-Q of SM Energy Company;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of 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 and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: August 2, 2018

/s/ JAVAN D. OTTOSON

Javan D. Ottoson

President and Chief Executive Officer

EX-31.2

EXHIBIT 31.2

CERTIFICATION

I, A. Wade Pursell, certify that:

1. I have reviewed this quarterly report on Form 10-Q of SM Energy Company;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of 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 and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: August 2, 2018

/s/ A. WADE PURSELL

A. Wade Pursell

Executive Vice President and Chief Financial Officer

EX-32.1

EXHIBIT 32.1

CERTIFICATION

PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report on Form 10-Q of SM Energy Company (the “Company”) for the quarterly period ended June 30, 2018, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), Javan D. Ottoson, as President and Chief Executive Officer of the Company, and A. Wade Pursell, as Executive Vice President and Chief Financial Officer of the Company, each hereby certifies, pursuant to and solely for the purpose of 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, to the best of his knowledge and belief, that:

(1)    The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934 (15 U.S.C. 78m or 78o(d)); and

(2)    The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ JAVAN D. OTTOSON

Javan D. Ottoson

President and Chief Executive Officer

August 2, 2018

/s/ A. WADE PURSELL

A. Wade Pursell

Executive Vice President and Chief Financial Officer

August 2, 2018

XML

Document and Entity Information Document - shares	6 Months Ended
	Jun. 30, 2018	Jul. 25, 2018
Document and Entity Information [Abstract]
Entity Registrant Name	SM Energy Co
Entity Central Index Key	0000893538
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Jun. 30, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding		112,137,582
Entity Current Reporting Status	Yes

XML

CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (in thousands, except share data) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018		Jun. 30, 2018		Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 615,906		$ 615,906		$ 313,943
Accounts receivable	178,682		178,682		160,154
Derivative assets	146,329		146,329		64,266
Prepaid expenses and other	14,293		14,293		10,752
Total current assets	955,210		955,210		549,115
Property and equipment (successful efforts method):
Proved oil and gas properties	6,372,956		6,372,956		6,139,379
Accumulated depletion, depreciation, and amortization	(3,041,653)		(3,041,653)		(3,171,575)
Unproved oil and gas properties	1,917,883		1,917,883		2,047,203
Wells in progress	361,238		361,238		321,347
Oil and gas properties held for sale, net	5,040		5,040		111,700
Other property and equipment, net of accumulated depreciation of $53,483 and $49,985, respectively	102,986		102,986		106,738
Total property and equipment, net	5,718,450		5,718,450		5,554,792
Noncurrent assets:
Derivative assets	31,151		31,151		40,362
Other noncurrent assets	31,674		31,674		32,507
Total noncurrent assets	62,825		62,825		72,869
Total assets	6,736,485		6,736,485		6,176,776
Current liabilities:
Accounts payable and accrued expenses	446,318		446,318		386,630
Current portion of Senior Notes, net of unamortized deferred financing costs (note 5)	342,301		342,301		0
Derivative liabilities	259,338		259,338		172,582
Total current liabilities	1,047,957		1,047,957		559,212
Noncurrent liabilities:
Revolving credit facility	0		0		0
Noncurrent portion of Senior Notes, net of unamortized deferred financing costs	2,429,994		2,429,994		2,769,663
Senior Convertible Notes, net of unamortized discount and deferred financing costs	143,430		143,430		139,107
Asset retirement obligations	87,279		87,279		103,026
Asset retirement obligations associated with oil and gas properties held for sale	0		0		11,369
Deferred income taxes	177,709		177,709		79,989
Derivative liabilities	67,583		67,583		71,402
Other noncurrent liabilities	45,906		45,906		48,400
Total noncurrent liabilities	2,951,901		2,951,901		3,222,956
Commitments and contingencies (note 6)
Stockholders’ equity:
Common stock, $0.01 par value - authorized: 200,000,000 shares; issued and outstanding: 111,846,998 and 111,687,016 shares, respectively	1,118		1,118		1,117
Additional paid-in capital	1,754,169		1,754,169		1,741,623
Retained earnings	997,641	[1]	997,641	[1]	665,657
Accumulated other comprehensive loss	(16,301)	[1]	(16,301)	[1]	(13,789)
Total stockholders’ equity	2,736,627		2,736,627		2,394,608
Total liabilities and stockholders’ equity	6,736,485		6,736,485		6,176,776
Exploration	14,056		27,783
6.50% Senior Notes due 2021 | Senior Notes [Member]
Current liabilities:
Current portion of Senior Notes, net of unamortized deferred financing costs (note 5)	$ 342,301		$ 342,301
Noncurrent liabilities:
Noncurrent portion of Senior Notes, net of unamortized deferred financing costs					$ 341,955

[1] (1) The Company reclassified $3.0 million of tax effects stranded in accumulated other comprehensive loss to retained earnings as of January 1, 2018. Please refer to Note 1 - Summary of Significant Accounting Policies for further detail.

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Condensed Consolidated Balance Sheets Parenthetical - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Property, Plant and Equipment, Other, Accumulated Depreciation	$ 53,483	$ 49,985
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Common Stock, Shares Authorized	200,000,000	200,000,000
Common Stock, Shares, Issued	111,846,998	111,687,016
Common Stock, Shares, Outstanding	111,846,998	111,687,016

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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) (in thousands, except per share data) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Operating revenues and other income:
Oil, gas, and NGL production revenue	$ 402,558	$ 284,939	$ 785,444	$ 618,137
Net gain (loss) on divestiture activity	39,501	(167,133)	424,870	(129,670)
Other operating revenues	1,857	2,915	3,197	4,992
Total operating revenues and other income	443,916	120,721	1,213,511	493,459
Operating expenses:
Oil, gas, and NGL production expense	117,400	124,376	238,279	262,422
Depletion, depreciation, amortization, and asset retirement obligation liability accretion	151,765	153,232	282,238	291,044
Exploration	14,056	12,983	27,783	24,800
Abandonment and impairment of unproved properties	11,935	157	17,560	157
General and administrative	28,920	28,237	56,602	57,054
Net derivative (gain) loss	63,749	(55,189)	71,278	(169,963)
Other operating expenses, net	(57)	4,251	4,555	9,110
Total operating expenses	387,768	268,047	698,295	474,624
Income (loss) from operations	56,148	(147,326)	515,216	18,835
Interest expense	(41,654)	(44,595)	(84,739)	(91,548)
Loss on extinguishment of debt	0	0	0	(35)
Other non-operating income, net	1,802	953	2,211	720
Income (loss) before income taxes	16,296	(190,968)	432,688	(72,028)
Income tax (expense) benefit	901	71,061	(98,090)	26,555
Net income (loss)	$ 17,197	$ (119,907)	$ 334,598	$ (45,473)
Basic weighted-average common shares outstanding	111,701	111,277	111,698	111,274
Diluted weighted-average common shares outstanding	113,630	111,277	113,267	111,274
Basic net income (loss) per common share	$ 0.15	$ (1.08)	$ 3.00	$ (0.41)
Diluted net income (loss) per common share	0.15	(1.08)	2.95	(0.41)
Dividends per common share	$ 0.00	$ 0.00	$ 0.05	$ 0.05

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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (UNAUDITED) (in thousands) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 17,197	$ (119,907)	$ 334,598	$ (45,473)
Other comprehensive income (loss), net of tax:
Pension liability adjustment	198	124	458	(443)
Total other comprehensive income (loss), net of tax	198	124	458	(443)
Total comprehensive income (loss)	$ 17,395	$ (119,783)	$ 335,056	$ (45,916)

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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (in thousands) - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities:
Net income (loss)		$ 334,598	$ (45,473)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Net (gain) loss on divestiture activity		(424,870)	129,670
Depletion, depreciation, amortization, and asset retirement obligation liability accretion		282,238	291,044
Abandonment and impairment of unproved properties		17,560	157
Stock-based compensation expense		10,676	9,813
Net derivative (gain) loss		71,278	(169,963)
Derivative settlement gain (loss)		(61,193)	16,310
Amortization of debt discount and deferred financing costs		7,750	8,679
Loss on extinguishment of debt		0	35
Deferred income taxes		97,505	(30,790)
Other, net		(2,302)	4,464
Net change working capital		(21,722)	28,182
Net cash provided by operating activities		311,518	242,128
Cash flows from investing activities:
Net proceeds from the sale of oil and gas properties		742,215	766,247
Capital expenditures		(723,319)	(366,743)
Acquisition of proved and unproved oil and gas properties		(24,615)	(88,140)
Net cash provided by (used in) investing activities		(5,719)	311,364
Cash flows from financing activities:
Proceeds from credit facility		0	406,000
Repayment of credit facility		0	(406,000)
Cash paid to repurchase Senior Notes		0	(2,344)
Cash paid for extinguishment of debt		0	(13)
Net proceeds from sale of common stock		1,881	1,738
Dividends paid		(5,584)	(5,563)
Other, net		(133)	(161)
Net cash used in financing activities		(3,836)	(6,343)
Net change in cash, cash equivalents, and restricted cash	[1]	301,963	547,149
Cash, cash equivalents, and restricted cash at beginning of period	[1]	313,943	12,372
Cash, cash equivalents, and restricted cash at end of period	[1]	615,906	559,521
Operating activities:
Cash paid for interest, net of capitalized interest		(77,803)	(83,493)
Net cash (paid) refunded for income taxes		207	(8,220)
Investing activities:
Changes in capital expenditure accruals and other		62,167	44,770
Supplemental non-cash investing activities:
Carrying value of properties exchanged		0
Supplemental non-cash financing activities:
Non-cash (gain) loss on extinguishment of debt, net		$ 0	$ 22

[1] (1) Refer to Note 1 - Summary of Significant Accounting Policies for a reconciliation of cash, cash equivalents, and restricted cash reported to the amounts reported within the accompanying unaudited condensed consolidated balance sheets (“accompanying balance sheets”).

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Summary of Significant Accounting Policies

6 Months Ended

Jun. 30, 2018

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

Note 1 - Summary of Significant Accounting Policies

Description of Operations

SM Energy Company, together with its consolidated subsidiaries (“SM Energy” or the “Company”), is an independent energy company engaged in the acquisition, exploration, development, and production of crude oil and condensate, natural gas, and natural gas liquids (also respectively referred to as “oil,” “gas,” and “NGLs” throughout this report) in onshore North America.

Basis of Presentation

The accompanying unaudited condensed consolidated financial statements include the accounts of SM Energy and have been prepared in accordance with accounting principles generally accepted in the United States (“GAAP”) for interim financial information, the instructions to Quarterly Report on Form 10-Q, and Regulation S-X. These financial statements do not include all information and notes required by GAAP for annual financial statements. However, except as disclosed herein, there has been no material change in the information disclosed in the notes to the consolidated financial statements included in SM Energy’s Annual Report on Form 10-K for the year ended December 31, 2017 (the “2017 Form 10-K”). In the opinion of management, all adjustments, consisting of normal recurring adjustments considered necessary for a fair presentation of interim financial information, have been included. Operating results for the periods presented are not necessarily indicative of expected results for the full year. In connection with the preparation of the Company’s unaudited condensed consolidated financial statements, the Company evaluated events subsequent to the balance sheet date of June 30, 2018, and through the filing of this report. Certain prior period amounts have been reclassified to conform to the current presentation on the accompanying unaudited condensed consolidated financial statements.

Correction of Immaterial Errors

The accompanying unaudited condensed consolidated financial statements for the three months ended June 30, 2018, include non-cash adjustments that relate to the prior quarter.  For the three months ended June 30, 2018, the net gain (loss) on divestiture activity line item on the accompanying unaudited condensed consolidated statements of operations (“accompanying statements of operations”) includes $17.7 million of loss (approximately $13.7 million, net of tax) that should have been included in the estimated non-cash write down to fair value less selling costs recorded as of March 31, 2018, for the Divide County, North Dakota assets held for sale.  Additionally, for the three months ended June 30, 2018, the depletion, depreciation, amortization, and asset retirement obligation liability accretion expense line item on the accompanying statements of operations includes $6.7 million of additional expense (approximately $5.2 million, net of tax) that should have been recognized during the first quarter of 2018. Aggregated, these non-cash adjustments resulted in reported net income for the three months ended March 31, 2018, to be overstated by approximately $18.9 million (net of tax) with the corrections being recorded during the three months ended June 30, 2018, resulting in net income for the three months ended June 30, 2018, to be understated by approximately $18.9 million (net of tax). These non-cash adjustments are not deemed material with respect to the first or second quarters of 2018, or the anticipated results for fiscal year 2018. Further, these non-cash adjustments do not have an impact on the unaudited condensed consolidated financial statements for the six months ended June 30, 2018.

Significant Accounting Policies

The significant accounting policies followed by the Company are set forth in Note 1 - Summary of Significant Accounting Policies to the 2017 Form 10-K, and are supplemented by the notes to the unaudited condensed consolidated financial statements included in this report. These unaudited condensed consolidated financial statements should be read in conjunction with the 2017 Form 10-K.

Recently Issued Accounting Standards

Effective December 31, 2017, the Company early adopted, on a retrospective basis, Financial Accounting Standards Board (“FASB”) Accounting Standards Update (“ASU”) No. 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments (“ASU 2016-15”) and FASB ASU No. 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash (“ASU 2016-18”). ASU 2016-15 is intended to reduce diversity in practice in how certain transactions are classified in the statement of cash flows and ASU 2016-18 is intended to clarify guidance on the classification and presentation of restricted cash and restricted cash equivalents in the statement of cash flows. Please refer to Note 1 - Summary of Significant Accounting Policies in the 2017 Form 10-K for more information.

The accompanying unaudited condensed consolidated statements of cash flows (“accompanying statements of cash flows”) line items that were adjusted as a result of the adoption of ASU 2016-15 and ASU 2016-18 for the six months ended June 30, 2017, are summarized as follows:

	For the Six Months Ended June 30, 2017
	As Reported			As Adjusted
	(in thousands)
Cash flows from operating activities:
Non-cash (gain) loss on extinguishment of debt, net	$	22		N/A
Loss on extinguishment of debt	N/A			$	35
Net cash provided by operating activities	$	242,115		$	242,128
Cash flows from investing activities:
Other, net	$	3,000		N/A
Net cash provided by (used in) investing activities	$	314,364		$	311,364
Cash flows from financing activities:
Cash paid for extinguishment of debt	N/A			$	(13	)
Net cash used in financing activities	$	(6,330	)	$	(6,343	)
Net change in cash and cash equivalents	$	550,149		N/A
Net change in cash, cash equivalents, and restricted cash	N/A			$	547,149
Cash and cash equivalents at beginning of period	$	9,372		N/A
Cash, cash equivalents, and restricted cash at beginning of period	N/A			$	12,372
Cash and cash equivalents at end of period	$	559,521		N/A
Cash, cash equivalents, and restricted cash at end of period	N/A			$	559,521

The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the accompanying balance sheets:

	As of June 30, 2018		As of December 31, 2017
	(in thousands)
Cash and cash equivalents	$	615,906	$	313,943
Restricted cash	—		—
Total cash, cash equivalents, and restricted cash	$	615,906	$	313,943

Effective January 1, 2018, the Company adopted FASB ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606) and all related ASUs (“ASU 2014-09”). Under the new guidance, revenue is recognized when a customer obtains control of promised goods or services in an amount that reflects the consideration the entity expects to receive in exchange for those goods or services. The Company adopted ASU 2014-09 using the modified retrospective transition method, which was applied to all active contracts as of the effective date. The adoption of ASU 2014-09 did not result in a change to current or prior period results nor did it result in a material change to the Company’s business processes, systems, or controls. However, upon adopting ASU 2014-09, the Company expanded its disclosures to comply with the expanded disclosure requirements of ASU 2014-09. Please refer to Note 2 - Revenue from Contracts with Customers for additional discussion.

Effective January 1, 2018, the Company adopted FASB ASU No. 2017-07, Compensation-Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost (“ASU 2017-07”). ASU 2017-07 requires presentation of service cost in the same line item(s) as other compensation costs arising from services rendered by employees during the period and presentation of the remaining components of net benefit cost in a separate line item, outside of operating items, which the Company adopted with retrospective application. In addition, only the service component of the net benefit cost is eligible for capitalization, which the Company adopted with prospective application. Please refer to Note 1 - Summary of Significant Accounting Policies in the 2017 Form 10-K for more information.

The accompanying statements of operations line items that were adjusted as a result of the adoption of ASU 2017-07 for the three and six months ended June 30, 2017, are summarized as follows:

	For the Three Months Ended June 30, 2017						For the Six Months Ended June 30, 2017
	As Reported			As Adjusted			As Reported		As Adjusted
	(in thousands)
Operating expenses:
Exploration	$	13,072		$	12,983		$	25,050	$	24,800
General and administrative	$	28,460		$	28,237		$	57,684	$	57,054
Total operating expenses	$	268,359		$	268,047		$	475,504	$	474,624
Income (loss) from operations	$	(147,638	)	$	(147,326	)	$	17,955	$	18,835
Other non-operating income, net	$	1,265		$	953		$	1,600	$	720

Effective January 1, 2018, the Company early adopted ASU No. 2018-02, Income Statement-Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income (“ASU 2018-02”) by applying the changes in the period of adoption. ASU 2018-02 permits entities to reclassify tax effects stranded in accumulated other comprehensive income (loss) to retained earnings as a result of the enactment into law on December 22, 2017, of H.R.1, formally the Tax Cuts and Jobs Act (the “2017 Tax Act”). As a result of adopting ASU 2018-02, the Company reclassified $3.0 million of tax effects stranded in accumulated other comprehensive loss to retained earnings as of January 1, 2018. The Company’s policy for releasing income tax effects within accumulated other comprehensive loss is an incremental, unit-of-account approach.

In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) (“ASU 2016-02”), which requires recognition of right-of-use assets and lease payment liabilities on the balance sheet by lessees for virtually all leases currently classified as operating leases. The scope of ASU 2016-02 does not apply to leases used in the exploration or use of minerals, oil, natural gas, or other similar non-regenerative resources. Under ASU 2016-02, companies are permitted to make a policy election to not recognize lease assets or liabilities when the term of the lease is less than twelve months. For agreements that contain both lease and non-lease components, companies are also permitted to make a policy election to combine both the lease and non-lease components together and account for these arrangements as a single lease. The Company has established a cross-functional project team and is leveraging external consultants to evaluate the impacts of ASU 2016-02, which includes an analysis of non-cancelable leases, drilling rig contracts, certain midstream agreements, and other existing arrangements that may contain a lease component. Further, the Company is also evaluating policies, controls, and processes that will be necessary to support the additional accounting and disclosure requirements. The Company is also in the process of designing and implementing a lease administration system that will support the on-going maintenance and accounting for leases after adoption. The Company will adopt ASU 2016-02 on January 1, 2019, and plans on using the modified retrospective approach. Adoption of this guidance is expected to result in an increase in right-of-use assets and related liabilities on the Company’s consolidated balance sheets; however, the full impact to the Company’s financial statements and related disclosures is still being evaluated.

In January 2018, the FASB issued ASU No. 2018-01, Leases (Topic 842): Land Easement Practical Expedient for Transition to Topic 842 (“ASU 2018-01”), which provides an optional transitional practical expedient that allows entities to exclude from evaluation land easements that existed or expired before adoption of ASU 2016-02. Companies that elect this practical expedient will need to evaluate new or modified land easements after adopting ASU 2016-02. If this practical expedient is not elected, companies will need to evaluate all existing or expired land easements as part of the overall adoption of ASU 2016-02. The Company expects to elect to use this practical expedient as outlined in ASU 2018-01 and will adopt ASU 2018-01 at the same time it adopts ASU 2016-02.

In July 2018, the FASB issued ASU No. 2018-11, Leases (Topic 842): Targeted Improvements (“ASU 2018-11”). ASU 2018-11 provides an additional transition method for adopting ASU 2016-02, as well as provides lessors with a practical expedient when applying ASU 2016-02 to certain leases. The Company is currently evaluating ASU 2018-11 as part of its overall assessment of ASU 2016-02, and will adopt ASU 2018-11 at the same time it adopts ASU 2016-02.

Other than as disclosed above or in the 2017 Form 10-K, there are no other ASUs applicable to the Company that would have a material effect on the Company’s consolidated financial statements and related disclosures that have been issued but not yet adopted by the Company as of June 30, 2018, and through the filing of this report.

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Revenue from Contracts with Customers

6 Months Ended

Jun. 30, 2018

Revenue from Contract with Customer [Abstract]

Revenue from Contracts with Customers

Note 2 - Revenue from Contracts with Customers

The Company recognizes its share of revenue from the sale of produced oil, gas, and NGLs in its Permian, South Texas & Gulf Coast, and Rocky Mountain regions. During the first quarter of 2018, the Company entered into two definitive agreements to sell all of its producing properties in its Rocky Mountain region. One transaction closed in the first quarter of 2018, and the second transaction closed in the second quarter of 2018. As a result of these divestitures, the Company does not expect any additional production revenue from the Rocky Mountain region after the second quarter of 2018. Please refer to Note 3 - Divestitures, Assets Held for Sale, and Acquisitions for additional detail. Oil, gas, and NGL production revenue presented within the accompanying statements of operations is reflective of the revenue generated from contracts with customers.

The tables below present the disaggregation of oil, gas, and NGL production revenue by product type for each of the Company’s operating regions for the three and six months ended June 30, 2018, and 2017:

	Permian						South Texas & Gulf Coast						Rocky Mountain						Total
	Three Months Ended June 30,						Three Months Ended June 30,						Three Months Ended June 30,						Three Months Ended June 30,
	2018			2017			2018			2017			2018			2017			2018			2017
	(in thousands)
Oil, gas, and NGL production revenue:
Oil production revenue	$	227,636		$	78,554		$	19,346		$	13,072		$	19,168		$	37,248		$	266,150		$	128,874
Gas production revenue	31,734			12,937			52,235			87,760			95			1,043			84,064			101,740
NGL production revenue	129			107			52,248			53,558			(33		)	660			52,344			54,325
Total	$	259,499		$	91,598		$	123,829		$	154,390		$	19,230		$	38,951		$	402,558		$	284,939
Relative percentage	64		%	32		%	31		%	54		%	5		%	14		%	100		%	100		%

____________________________________________

Note: Amounts may not calculate due to rounding.

	Permian						South Texas & Gulf Coast						Rocky Mountain						Total
	Six Months Ended June 30,						Six Months Ended June 30,						Six Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017			2018			2017			2018			2017
	(in thousands)
Oil, gas, and NGL production revenue:
Oil production revenue	$	433,430		$	160,053		$	38,929		$	51,936		$	54,851		$	84,509		$	527,210		$	296,498
Gas production revenue	56,611			24,246			104,968			175,961			1,594			2,714			163,173			202,921
NGL production revenue	253			254			94,018			116,915			790			1,549			95,061			118,718
Total	$	490,294		$	184,553		$	237,915		$	344,812		$	57,235		$	88,772		$	785,444		$	618,137
Relative percentage	63		%	30		%	30		%	56		%	7		%	14		%	100		%	100		%

____________________________________________

Note: Amounts may not calculate due to rounding.

The Company recognizes oil, gas, and NGL production revenue at the point in time when control of the product transfers to the customer, which differs depending on the contractual terms of each of the Company’s arrangements. Transfer of control drives the presentation of transportation, gathering, processing, and other post-production expenses (“fees and other deductions”) within the accompanying statements of operations. Fees and other deductions incurred prior to control transfer are recorded within the oil, gas, and NGL production expense line item on the accompanying statements of operations, while fees and other deductions incurred subsequent to control transfer are recorded as a reduction of oil, gas, and NGL production revenue. The Company has four general categories under which oil, gas, and NGL production revenue is generated. Each of the Company’s operating regions generate production revenue from a combination of some or all of the four different contract types summarized below:

1) The Company sells oil production at or near the wellhead and receives an agreed-upon index price from the purchaser, net of basis, quality, and transportation differentials. Under this arrangement, control transfers at or near the wellhead.

2) The Company sells unprocessed gas to a midstream processor at the wellhead or inlet of the midstream processing facility. The midstream processor gathers and processes the raw gas stream and remits proceeds to the Company from the ultimate sale of the processed NGLs and residue gas to third parties. In such arrangements, the midstream processor obtains control of the product at the wellhead or inlet and is considered the customer. Proceeds received for unprocessed gas under these arrangements are reflected as gas production revenue above and are recorded net of transportation and processing fees incurred by the midstream processor after control has transferred.

3) The Company has certain processing arrangements that include the delivery of unprocessed gas to the inlet of a midstream processor’s facility for processing. Upon completion of processing, the midstream processor purchases the NGLs and redelivers residue gas back to the Company in-kind. For the NGLs extracted during processing, the midstream processor remits payment to the Company based on the proceeds it generates from selling the NGLs to other third parties. For the residue gas taken in-kind, the Company has separate sales contracts where control transfers at points downstream of the processing facility. Given the structure of these arrangements and where control transfers, the Company separately recognizes gathering, transportation, and processing fees incurred prior to control transfer. These fees are recorded within the oil, gas, and NGL production expense line item on the accompanying statements of operations.

4) The Company has certain midstream processing arrangements where unprocessed gas is delivered to the inlet of the midstream processor’s facility for processing. Upon completion of processing, the midstream processor purchases the processed NGLs and residue gas and remits the proceeds to the Company from the sale of the products to third-party customers. In these arrangements, control transfers at the tailgate of the midstream processing facility for both products. Given the structure of these arrangements and where control transfers, the Company separately recognizes gathering, transportation, and processing fees incurred prior to control transfer. These fees are recorded within the oil, gas, and NGL production expense line item on the accompanying statements of operations.

Significant judgments made in applying the guidance in Accounting Standards Codification Topic 606, Revenue from Contracts with Customers relate to the point in time when control transfers to customers in gas processing arrangements with midstream processors. The Company does not believe that significant judgments are required with respect to the determination of the transaction price, including amounts that represent variable consideration, as volume and price carry a low level of estimation uncertainty given the precision of volumetric measurements and the use of index pricing with predictable differentials. Accordingly, the Company does not consider estimates of variable consideration to be constrained.

The Company’s contractual performance obligations arise upon the production of hydrocarbons from wells in which the Company has an ownership interest. The performance obligations are considered satisfied upon control transferring to a customer at the wellhead, inlet, or tailgate of the midstream processor’s processing facility, or other contractually specified delivery point. The time period between production and satisfaction of performance obligations is generally less than one day; thus, there are no material unsatisfied or partially unsatisfied performance obligations at the end of the reporting period.

Revenue is recorded in the month when contractual performance obligations are satisfied. However, settlement statements from the purchasers of hydrocarbons and the related cash consideration are generally received 30 to 90 days after production has occurred. As a result, the Company must estimate the amount of production delivered to the customer and the consideration that will ultimately be received for sale of the product. Estimated revenue due to the Company is recorded within accounts receivable on the accompanying balance sheets until payment is received. The accounts receivable balances from contracts with customers within the accompanying balance sheets as of June 30, 2018, and December 31, 2017, were $115.0 million and $96.6 million, respectively. To estimate accounts receivable from contracts with customers, the Company uses knowledge of its properties, historical performance, contractual arrangements, pricing, quality and transportation differentials, and other factors as the basis for these estimates. Differences between estimates and actual amounts received for product sales are recorded in the month that payment is received from the purchaser. Revenue recognized for the three and six months ended June 30, 2018, that related to performance obligations satisfied in prior reporting periods was immaterial.

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Divestitures, Assets Held for Sale, and Acquisitions

6 Months Ended

Jun. 30, 2018

Divestitures, Assets Held for Sale, and Acquisitions [Abstract]

Divestitures, Assets Held for Sale, and Acquisitions [Text Block]

Note 3 - Divestitures, Assets Held for Sale, and Acquisitions

Divestitures

On March 26, 2018,the Company divested approximately 112,000 net acres of its Powder River Basin assets (the “PRB Divestiture”), for total cash received at closing, net of costs (referred to throughout this report as “net divestiture proceeds”), of $490.8 million, subject to final purchase price adjustments, and recorded an estimated net gain of $410.1 million for the six months endedJune 30, 2018.

During the second quarter of 2018, the Company completed the divestitures of its remaining assets in the Williston Basin located in Divide County, North Dakota (the “Divide County Divestiture”) and its Halff East assets in the Midland Basin (the “Halff East Divestiture”), for combined net divestiture proceeds received at closing of $250.8 million, subject to final purchase price adjustments, and recorded a combined estimated net gain of $15.7 million for the six months endedJune 30, 2018. Please refer to Note 1 - Summary of Significant Accounting Policiesfor a discussion of an immaterial non-cash adjustment related to the Divide County Divestiture that was recorded in the second quarter of 2018.

The following table presents loss before income taxes from the Divide County, North Dakota assets sold for the three and six months ended June 30, 2018, and 2017. The Divide County Divestiture was considered a disposal of a significant asset group.

	For the Three Months Ended June 30,						For the Six Months Ended June 30,
	2018			2017			2018			2017
	(in thousands)
Loss before income taxes (1)	$	(17,478	)	$	(153,442	)	$	(28,975	)	$	(486,161	)

____________________________________________

⁽¹⁾  Loss before income taxes reflects oil, gas, and NGL production revenue, less oil, gas, and NGL production expense, depletion, depreciation, amortization, and asset retirement obligation liability accretion expense, impairment expense, and net loss on divestiture activity.

On March 10, 2017,the Company closed the divestiture of its outside-operated Eagle Ford shale assets, including its ownership interest in related midstream assets, for net divestiture proceeds received at closing of $747.4 million, and net divestiture proceeds of $744.1 million after final purchase price adjustments. The Company recorded an estimated net gain of $397.4 million for the six months ended June 30, 2017, and a final net gain of $396.8 million related to these divested assets for the year ended December 31, 2017. During the second quarter of 2017, the Company divested of assets located in Williams County, North Dakota, for net divestiture proceeds of $24.6 million.

Assets Held for Sale

Assets are classified as held for sale when the Company commits to a plan to sell the assets and it is probable the sale will take place within one year. Upon classification as held for sale, long-lived assets are no longer depreciated or depleted, and a measurement for impairment is performed to identify and expense any excess of carrying value over fair value less estimated costs to sell. When assets no longer meet the criteria of assets held for sale, they are measured at the lower of the carrying value of the assets before being classified as held for sale, adjusted for any depletion, depreciation, and amortization expense that would have been recognized, or the fair value at the date they are reclassified to assets held for use. Any gain or loss recognized on assets held for sale or on assets held for sale that are subsequently reclassified to assets held for use is reflected in the net gain (loss) on divestiture activity line item on the accompanying statements of operations. As of June 30, 2018, there were $5.0 million of assets held for sale presented on the accompanying balance sheets.

During the second quarter of 2017, the Company reclassified its retained Divide County assets previously held for sale to assets held for use. A $359.6 million write-down was recorded on these assets in the first quarter of 2017 based on the estimated fair value less selling costs as of March 31, 2017. An additional $166.9 million write-down was recorded in the second quarter of 2017 based on market conditions that existed on the date the Company made its decision to retain these assets.

Acquisitions

During the second quarter of 2018, the Company acquired approximately 720 net acres of unproved properties in Martin County, Texas, for $24.6 million. Under authoritative accounting guidance, this transaction was considered an asset acquisition. Therefore, the properties were recorded based on the fair value of the total consideration transferred on the acquisition date and the transaction costs were capitalized as a component of the cost of the assets acquired. During the first half of 2017, the Company acquired approximately 3,400 net acres of primarily unproved properties in Howard and Martin Counties, Texas, in multiple transactions for a total of $72.3 million of cash consideration, which were accounted for as asset acquisitions.

Also, during the first half of 2017, the Company completed several non-monetary acreage trades of primarily unproved properties in Howard and Martin Counties, Texas, resulting in the Company acquiring approximately 6,550 net acres in exchange for approximately 5,700 net acres, with $279.8 million of carrying value attributed to the properties surrendered by the Company in such trades. These trades were recorded at carryover basis with no gain or loss recognized.

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Income Taxes

6 Months Ended

Jun. 30, 2018

Income Tax Disclosure [Abstract]

Income Taxes

Note 4 - Income Taxes

The income tax (expense) benefit recorded for the three and six months ended June 30, 2018, and 2017, differs from the amounts that would be provided by applying the statutory United States federal income tax rate to income or loss before income taxes primarily due to the effect of state income taxes, excess tax benefits and deficiencies from share-based payment awards, changes in valuation allowances, and accumulated impacts of other smaller permanent differences. The quarterly rate can also be affected by the proportional impacts of forecasted net income or loss as of each period end presented.

The provision for income taxes for the three and six months ended June 30, 2018, and 2017, consisted of the following:

	For the Three Months Ended   June 30,						For the Six Months Ended   June 30,
	2018			2017			2018			2017
	(in thousands)
Current portion of income tax (expense) benefit:
Federal	$	—		$	4,607		$	—		$	(2,832	)
State	40			2,439			(585		)	(1,403		)
Deferred portion of income tax (expense) benefit	861			64,015			(97,505		)	30,790
Income tax (expense) benefit	$	901		$	71,061		$	(98,090	)	$	26,555
Effective tax rate	(5.5		)%	37.2		%	22.7		%	36.9		%

The enactment of the 2017 Tax Act on December 22, 2017, reduced the Company’s federal tax rate for 2018 and future years from 35 percent to 21 percent. Although the Company believes it has properly analyzed the tax accounting impacts of the 2017 Tax Act, it will continue to monitor provisions with discrete rate impacts, such as the limitation on executive compensation for subsequent events and guidance within the one year measurement period. There are no new estimates or finalized income tax items associated with the 2017 Tax Act included in income tax expense for the three or six months endedJune 30, 2018.

On a year-to-date basis, a change in the Company’s effective tax rate between reporting periods will generally reflect differences in its estimated highest marginal state tax rate due to changes in the composition of income or loss from Company activities, including divestitures, among multiple state tax jurisdictions. For the three months ended June 30, 2018, the decrease in the effective tax rate year-over-year also reflects the cumulative effects of property divestitures in higher marginal rate states in 2018. Cumulative effects of state tax rate changes are reflected in the period legislation is enacted. Excess tax benefits and deficiencies from share-based payment awards impact the Company’s effective tax rate between periods.

In 2017, the Company re-evaluated various factors affecting deferred tax assets related to net operating losses and tax credits, and determined utilization would be appropriate. The change in the current portion of income tax (expense) benefit between periods reflects the effect of this determination. The Company is generally no longer subject to United States federal or state income tax examinations by tax authorities for years before 2013.

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Long-Term Debt (Notes)

6 Months Ended

Jun. 30, 2018

Debt Disclosure [Abstract]

Long-Term Debt [Text Block]

Note 5 - Long-Term Debt

Credit Agreement

The Company’s Fifth Amended and Restated Credit Agreement, as amended, (the “Credit Agreement”) provides for a maximum loan amount of $2.5 billion and has a maturity date of December 10, 2019. On April 24, 2018, as part of the regular, semi-annual borrowing base redetermination process, the borrowing base and aggregate lender commitments were increased to $1.4 billion and $1.0 billion, respectively. Upon completion of the Divide County Divestiture on May 30, 2018, the Company’s borrowing base was reduced to $1.3 billion, while the aggregate lender commitments remained at $1.0 billion. Please refer to Note 3 - Divestitures, Assets Held for Sale, and Acquisitions for additional discussion on the sale of these assets. The next scheduled redetermination date is October 1, 2018.

The Company must comply with certain financial and non-financial covenants under the terms of the Credit Agreement and was in compliance with all such covenants as of June 30, 2018, and through the filing of this report.

Interest and commitment fees are accrued based on a borrowing base utilization grid set forth in the Credit Agreement as presented in Note 5 - Long-Term Debt in the 2017 Form 10-K.  Eurodollar loans accrue interest at the London Interbank Offered Rate, plus the applicable margin from the utilization grid, and Alternate Base Rate and swingline loans accrue interest at the prime rate, plus the applicable margin from the utilization grid.  Commitment fees are accrued on the unused portion of the aggregate lender commitment amount at rates from the utilization grid and are included in interest expense in the accompanying statements of operations.

The following table presents the outstanding balance, total amount of letters of credit outstanding, and available borrowing capacity under the Credit Agreement as of July 25, 2018, June 30, 2018, and December 31, 2017:

	As of July 25, 2018		As of June 30, 2018		As of December 31, 2017
	(in thousands)
Credit facility balance (1)	$	—	$	—	$	—
Letters of credit (2)	200		200		200
Available borrowing capacity	999,800		999,800		924,800
Total aggregate lender commitment amount	$	1,000,000	$	1,000,000	$	925,000

____________________________________________

⁽¹⁾  Unamortized deferred financing costs attributable to the credit facility are presented as a component of other noncurrent assets on the accompanying balance sheets and totaled $2.4 million and $3.1 million as of June 30, 2018, and December 31, 2017, respectively.

⁽²⁾  Letters of credit outstanding reduce the amount available under the credit facility on a dollar-for-dollar basis.

Senior Notes

The Company’s Senior Notes consist of 6.50% Senior Notes due 2021, 6.125% Senior Notes due 2022, 6.50% Senior Notes due 2023, 5.0% Senior Notes due 2024, 5.625% Senior Notes due 2025, and 6.75% Senior Notes due 2026 (collectively referred to as “Senior Notes”). On June 15, 2018, the Company called for redemption all of its 6.50% Senior Notes due 2021 (“2021 Senior Notes”) at a redemption price of 102.167% of the principal amount, plus accrued and unpaid interest on the principal amount of the 2021 Senior Notes to be redeemed (“2021 Senior Notes Redemption”). As a result of the 2021 Senior Notes Redemption, the 2021 Senior Notes, net of unamortized deferred financing costs, were classified as a current liability on the accompanying balance sheets as of June 30, 2018. On July 16, 2018, the Company completed the 2021 Senior Notes Redemption, which resulted in the payment of total consideration, including accrued interest, of $355.9 million. The Company will record a loss on extinguishment of debt of $9.8 million for the quarter ended September 30, 2018. This amount will include $7.5 million associated with the premium paid for the 2021 Senior Notes Redemption and $2.3 million related to the acceleration of unamortized deferred financing costs.

The current portion of Senior Notes, net of unamortized deferred financing costs and noncurrent portion of Senior Notes, net of unamortized deferred financing costs lines on the accompanying balance sheets as of June 30, 2018, and December 31, 2017, consisted of the following:

	As of June 30, 2018						As of December 31, 2017
	Principal Amount		Unamortized Deferred Financing Costs		Senior Notes, Net of Unamortized Deferred Financing Costs		Principal Amount		Unamortized Deferred Financing Costs		Senior Notes, Net of Unamortized Deferred Financing Costs
	(in thousands)
6.50% Senior Notes due 2021	$	344,611	$	2,310	$	342,301	$	344,611	$	2,656	$	341,955
6.125% Senior Notes due 2022	561,796		5,211		556,585		561,796		5,800		555,996
6.50% Senior Notes due 2023	394,985		3,342		391,643		394,985		3,707		391,278
5.0% Senior Notes due 2024	500,000		5,149		494,851		500,000		5,610		494,390
5.625% Senior Notes due 2025	500,000		6,261		493,739		500,000		6,714		493,286
6.75% Senior Notes due 2026	500,000		6,824		493,176		500,000		7,242		492,758
Total	$	2,801,392	$	29,097	$	2,772,295	$	2,801,392	$	31,729	$	2,769,663

The Senior Notes are unsecured senior obligations and rank equal in right of payment with all of the Company’s existing and any future unsecured senior debt, and are senior in right of payment to any future subordinated debt. There are no subsidiary guarantors of the Senior Notes.  The Company is subject to certain covenants under the indentures governing the Senior Notes and was in compliance with all such covenants as of June 30, 2018, and through the filing of this report. The Company may redeem some or all of its Senior Notes prior to their maturity at redemption prices based on a premium, plus accrued and unpaid interest as described in the indentures governing the Senior Notes.

Senior Convertible Notes

The Company’s Senior Convertible Notes consist of $172.5 million in aggregate principal amount of 1.50% Senior Convertible Notes due July 1, 2021 (the “Senior Convertible Notes”). The Senior Convertible Notes are unsecured senior obligations and rank equal in right of payment with all of the Company’s existing and any future unsecured senior debt, and are senior in right of payment to any future subordinated debt. Please refer to Note 5 - Long-Term Debt in the 2017 Form 10-K for additional detail on the Company’s Senior Convertible Notes and associated capped call transactions.

The Senior Convertible Notes were not convertible at the option of holders as of June 30, 2018, or through the filing of this report. Notwithstanding the inability to convert, the if-converted value of the Senior Convertible Notes as of June 30, 2018, did not exceed the principal amount. The debt discount and debt-related issuance costs are amortized to the principal value of the Senior Convertible Notes as interest expense through the maturity date of July 1, 2021. Interest expense recognized on the Senior Convertible Notes related to the stated interest rate and amortization of the debt discount totaled $2.6 million and $2.5 million for the three months ended June 30, 2018, and 2017, respectively, and totaled $5.2 million and $4.9 million for the six months ended June 30, 2018, and 2017, respectively.

There have been no changes to the initial net carrying amount of the equity component of the Senior Convertible Notes recorded in additional paid-in capital on the accompanying balance sheets. The Senior Convertible Notes, net of unamortized discount and deferred financing costs line on the accompanying balance sheets as of June 30, 2018, and December 31, 2017, consisted of the following:

	As of June 30, 2018			As of December 31, 2017
	(in thousands)
Principal amount of Senior Convertible Notes	$	172,500		$	172,500
Unamortized debt discount	(26,319		)	(30,183		)
Unamortized deferred financing costs	(2,751		)	(3,210		)
Senior Convertible Notes, net of unamortized discount and deferred financing costs	$	143,430		$	139,107

The Company is subject to certain covenants under the indenture governing the Senior Convertible Notes and was in compliance with all such covenants as of June 30, 2018, and through the filing of this report.

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Commitments and Contingencies

6 Months Ended

Jun. 30, 2018

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies [Text Block]

Note 6 - Commitments and Contingencies

Commitments

As of June 30, 2018, the Company had total gathering, processing, transportation throughput, and purchase commitments with various third parties that require delivery of a minimum quantity of 31 MMBbl of oil, 737 Bcf of gas, and 22 MMBbl of produced water through 2027 and a minimum purchase quantity of 7 MMBbl of water by 2022. If the Company fails to deliver or purchase any product, as applicable, the aggregate undiscounted future deficiency payments as of June 30, 2018, would total approximately $360.6 million. This amount does not include any costs that may be incurred for certain contracts where the Company cannot predict with accuracy the amount and timing of any payments that may be incurred for not meeting certain minimum commitments, as such payments are dependent upon the price of oil in effect at the time of settlement. Under certain of the Company’s commitment agreements, if the Company is unable to deliver the minimum quantity from its production, it may deliver production acquired from third parties. As of the filing of this report, the Company does not expect to incur any material shortfalls with regard to these commitments.

The Company entered into new and amended drilling rig and completion service contracts during the first six months of 2018 and subsequent to June 30, 2018. As of the filing of this report, the Company’s drilling rig and completion service contract commitments totaled $103.1 million; however, if the Company terminated these contracts immediately, it would incur penalties of $40.4 million.

Additionally, as of June 30, 2018, the Company had fixed price contracts with various third parties to purchase electricity through 2027 for a total of $30.8 million. As of the filing of this report, the Company expects to meet these purchase commitments.

There were no other material changes in commitments during the first six months of 2018. Please refer to Note 6 - Commitments and Contingencies in the 2017 Form 10-K for additional discussion of the Company’s commitments.

Contingencies

The Company is subject to litigation and claims arising in the ordinary course of business.  The Company accrues for such items when a liability is both probable and the amount can be reasonably estimated.  In the opinion of management, the results of any pending litigation and claims are not expected to have a material effect on the results of operations, the financial position, or the cash flows of the Company.

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Compensation Plans

6 Months Ended

Jun. 30, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Compensation Plans [Text Block]

Note 7 - Compensation Plans

Equity Incentive Compensation Plan

As of June 30, 2018, 6.8 million shares of common stock were available for grant under the Company’s Equity Incentive Compensation Plan.

Performance Share Units

The Company grants performance share units (“PSUs”) to eligible employees as part of its long-term equity incentive compensation program. The number of shares of the Company’s common stock issued to settle PSUs ranges from zero to two times the number of PSUs awarded and is determined based on certain performance criteria over a three-year performance period. For PSUs that were granted in 2015, 2016, and 2017, the performance criteria is based on a combination of the Company’s annualized Total Shareholder Return (“TSR”) for the performance period and the relative performance of the Company’s TSR compared with the annualized TSR of certain peer companies for the performance period. Compensation expense for PSUs is recognized within general and administrative expense and exploration expense over the vesting periods of the respective awards.

Total compensation expense recorded for PSUs was $2.4 million and $1.7 million for the three months ended June 30, 2018, and 2017, respectively, and was $4.8 million and $4.2 million for the six months ended June 30, 2018, and 2017, respectively. As of June 30, 2018, there was $12.4 million of total unrecognized compensation expense related to non-vested PSU awards, which is being amortized through 2020. There were no material changes to the outstanding and non-vested PSUs during the six months ended June 30, 2018.

Subsequent to June 30, 2018, the Company granted 572,924 PSUs with a fair value of $14.0 million (“2018 PSU Grant”). The fair value of the 2018 PSU Grant was measured at the grant date using a stochastic Monte Carlo simulation using geometric Brownian motion.  The number of shares of the Company’s common stock issued to settle the 2018 PSU Grant, after the completion of a three-year performance period, will range from zero to two times the number of PSUs granted on the award date, depending on the extent to which the Company has achieved certain performance criteria and to the extent the PSUs have vested. As outlined in the 2018 PSU Grant agreement, performance measurements affecting vesting are based on a combination of relative performance of the Company’s annualized TSR compared with the annualized TSR of certain peer companies over the three-year performance period, and relative performance of the Company’s debt adjusted per share cash flow growth (“DACFG”) compared with the DACFG of certain peer companies over the three-year performance period. In addition to these performance measures, the 2018 PSU Grant agreement also stipulates that if the Company’s annualized TSR is negative over the three-year performance period, the maximum number of shares of common stock that can be issued to settle outstanding PSUs is capped at one times the number of PSUs granted on the award date, regardless of the Company’s TSR and DACFG performance relative to its peers. Compensation expense associated with the 2018 PSU Grant will be evaluated on a quarterly basis and may be adjusted depending on the likelihood of achieving certain performance goals. The 2018 PSU Grant generally vests on the third anniversary of the date of the grant. Also, subsequent to June 30, 2018, the Company settled PSUs that were granted in 2015, with no shares issued upon settlement because the grant settled at a zero multiplier.

Employee Restricted Stock Units

The Company grants restricted stock units (“RSUs”) to eligible employees as part of its long-term equity incentive compensation program. Each RSU represents a right to receive one share of the Company’s common stock upon settlement of the award at the end of the specified vesting period. Compensation expense for RSUs is recognized within general and administrative expense and exploration expense over the vesting periods of the respective awards.

Total compensation expense recorded for employee RSUs was $2.3 million and $2.1 million for the three months ended June 30, 2018, and 2017, respectively, and was $5.0 million and $4.6 million for the six months ended June 30, 2018, and 2017, respectively. As of June 30, 2018, there was $12.8 million of total unrecognized compensation expense related to non-vested RSU awards, which is being amortized through 2020. There were no material changes to the outstanding and non-vested RSUs during the six months ended June 30, 2018.

Subsequent to June 30, 2018, the Company granted 534,770 RSUs with a fair value of $13.7 million. These RSUs generally vest one-third of the total grant on each of the next three anniversary dates of the grant. Also, subsequent to June 30, 2018, the Company settled 406,013 RSUs that related to awards granted in previous years. The Company and the majority of grant participants mutually agreed to net share settle a portion of the awards to cover income and payroll tax withholdings, as provided for in the plan document and award agreements. As a result, the Company issued 290,584 net shares of common stock upon settlement of the awards.

Director Shares

During the second quarter of 2018, the Company issued 58,572 shares of its common stock to its non-employee directors under the Company’s Equity Incentive Compensation Plan, which fully vest on December 31, 2018. During the second quarter of 2017, the Company issued 71,573 shares of its common stock to its non-employee directors and 8,794 RSUs to a non-employee director.

Employee Stock Purchase Plan

Under the Company’s Employee Stock Purchase Plan (“ESPP”), eligible employees may purchase shares of the Company’s common stock through payroll deductions of up to 15 percent of eligible compensation, without accruing in excess of $25,000 in value from purchases for each calendar year. The purchase price of the stock is 85 percent of the lower of the fair market value of the stock on either the first or last day of the purchase period. The ESPP is intended to qualify under Section 423 of the Internal Revenue Code. There were 100,249 and 123,678 shares issued under the ESPP during the second quarters of 2018, and 2017, respectively. Total proceeds to the Company for the issuance of these shares was $1.9 million and $1.7 million for the six months ended June 30, 2018, and 2017, respectively. The fair value of ESPP grants is measured at the date of grant using the Black-Scholes option-pricing model.

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Pension Benefits

6 Months Ended

Jun. 30, 2018

Defined Benefit Plan [Abstract]

Pension Benefits [Text Block]

Note 8 - Pension Benefits

Pension Plans

The Company has a non-contributory defined benefit pension plan covering employees who meet age and service requirements (the “Qualified Pension Plan”). The Company also has a supplemental non-contributory pension plan covering certain management employees (the “Nonqualified Pension Plan” and together with the Qualified Pension Plan, the “Pension Plans”). Effective as of January 1, 2016, the Company froze the Pension Plans to new participants, and employees eligible to participate in the Pension Plans prior to them being frozen will continue to earn benefits.

Components of Net Periodic Benefit Cost for the Pension Plans

The following table presents the components of the net periodic benefit cost for the Pension Plans:

	For the Three Months Ended   June 30,						For the Six Months Ended   June 30,
	2018			2017			2018			2017
	(in thousands)
Service cost	$	1,705		$	1,269		$	3,365		$	3,319
Interest cost	637			617			1,310			1,344
Expected return on plan assets that reduces periodic pension benefit cost	(370		)	(563		)	(931		)	(1,122		)
Amortization of prior service cost	5			5			9			9
Amortization of net actuarial loss	340			253			664			649
Net periodic benefit cost	$	2,317		$	1,581		$	4,417		$	4,199

Prior service costs are amortized on a straight-line basis over the average remaining service period of active participants. Gains and losses in excess of 10 percent of the greater of the benefit obligation or the market-related value of assets are amortized over the average remaining service period of active participants. As a result of the adoption of ASU 2017-07, the service cost component of net periodic benefit cost for the Pension Plans is presented as an operating expense within the general and administrative and exploration expense line items on the accompanying statements of operations while the other components of net periodic benefit cost for the Pension Plans are presented as non-operating expenses within the other non-operating income, net line item on the accompanying statements of operations. Please refer to Note 1 - Summary of Significant Accounting Policies for further detail.

Contributions

The Company contributed $6.1 million to the Qualified Pension Plan during the six months ended June 30, 2018.

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Earnings per Share

6 Months Ended

Jun. 30, 2018

Earnings Per Share [Abstract]

Earnings per Share [Text Block]

Note 9 - Earnings Per Share

Basic net income or loss per common share is calculated by dividing net income or loss available to common stockholders by the basic weighted-average number of common shares outstanding for the respective period. Diluted net income or loss per common share is calculated by dividing adjusted net income or loss by the diluted weighted-average number of common shares outstanding, which includes the effect of potentially dilutive securities. Potentially dilutive securities for this calculation consist primarily of non-vested RSUs, contingent PSUs, and shares into which the Senior Convertible Notes are convertible, which are measured using the treasury stock method. Shares of the Company’s common stock traded at an average closing price below the $40.50 conversion price for the three and six months ended June 30, 2018, and 2017, and therefore the Senior Convertible Notes had no dilutive impact. Please refer to Note 1 - Summary of Significant Accounting Policies in the 2017 Form 10-K for additional detail on these potentially dilutive securities.

When the Company recognizes a loss from continuing operations, all potentially dilutive shares are anti-dilutive and are consequently excluded from the calculation of diluted net loss per common share. The following table presents the weighted-average anti-dilutive securities for the periods presented:

	For the Three Months Ended   June 30,		For the Six Months Ended   June 30,
	2018	2017	2018	2017
	(in thousands)
Anti-dilutive	—	44	—	59

The following table sets forth the calculations of basic and diluted net income (loss) per common share:

	For the Three Months Ended   June 30,					For the Six Months Ended   June 30,
	2018		2017			2018		2017
	(in thousands, except per share data)
Net income (loss)	$	17,197	$	(119,907	)	$	334,598	$	(45,473	)
Basic weighted-average common shares outstanding	111,701		111,277			111,698		111,274
Dilutive effect of non-vested RSUs and contingent PSUs	1,929		—			1,569		—
Dilutive effect of Senior Convertible Notes	—		—			—		—
Diluted weighted-average common shares outstanding	113,630		111,277			113,267		111,274
Basic net income (loss) per common share	$	0.15	$	(1.08	)	$	3.00	$	(0.41	)
Diluted net income (loss) per common share	$	0.15	$	(1.08	)	$	2.95	$	(0.41	)

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Derivative Financial Instruments

6 Months Ended

Jun. 30, 2018

Derivative Instruments Not Designated as Hedging Instruments [Abstract]

Derivative Financial Instruments

Note 10 - Derivative Financial Instruments

Summary of Oil, Gas, and NGL Derivative Contracts in Place

The Company has entered into various commodity derivative contracts to mitigate a portion of its exposure to potentially adverse market changes in commodity prices and the associated impact on cash flows. As of June 30, 2018, all derivative counterparties were members of the Company’s credit facility lender group and all contracts were entered into for other-than-trading purposes. The Company’s commodity derivative contracts consist of swap and collar arrangements for oil and gas production, and swap arrangements for NGL production. In a typical commodity swap agreement, if the agreed upon published third-party index price (“index price”) is lower than the swap fixed price, the Company receives the difference between the index price and the agreed upon swap fixed price. If the index price is higher than the swap fixed price, the Company pays the difference.  For collar arrangements, the Company receives the difference between an agreed upon index and the floor price if the index price is below the floor price. The Company pays the difference between the agreed upon ceiling price and the index price if the index price is above the ceiling price. No amounts are paid or received if the index price is between the floor and ceiling prices.

The Company has also entered into fixed price oil basis swaps in order to mitigate exposure to adverse pricing differentials between certain industry benchmark prices and the actual physical pricing points where the Company’s production volumes are sold. Currently, the Company has basis swap contracts with fixed price differentials between NYMEX WTI and WTI Midland for a portion of its Midland Basin production with sales contracts that settle at WTI Midland prices. The Company also has basis swaps with fixed price differentials between NYMEX WTI and Intercontinental Exchange Brent Crude (“ICE Brent”) for a portion of its Midland Basin oil production with sales contracts that settle at ICE Brent prices.

As of June 30, 2018, the Company had commodity derivative contracts outstanding as summarized in the tables below:

Oil Swaps

Contract Period	NYMEX WTI Volumes	Weighted-Average  Contract Price
	(MBbl)	(per Bbl)
Third quarter 2018	1,769	$	49.77
Fourth quarter 2018	1,894	$	49.87
2019	1,940	$	50.70
Total	5,603

Oil Collars

Contract Period	NYMEX WTI  Volumes	Weighted- Average Floor  Price		Weighted- Average Ceiling  Price
	(MBbl)	(per Bbl)		(per Bbl)
Third quarter 2018	1,948	$	50.00	$	58.61
Fourth quarter 2018	2,222	$	50.00	$	58.44
2019	10,055	$	50.59	$	63.62
2020	366	$	55.00	$	67.01
Total	14,591

Oil Basis Swaps

Contract Period	WTI Midland-NYMEX WTI Volumes	Weighted-Average  Contract Price (1)			NYMEX WTI-ICE Brent Volumes	Weighted-Average Contract Price (2)
	(MBbl)	(per Bbl)			(MBbl)	(per Bbl)
Third quarter 2018	3,018	$	(1.06	)	—	$	—
Fourth quarter 2018	3,327	$	(1.08	)	—	$	—
2019	11,217	$	(3.36	)	—	$	—
2020	7,250	$	(1.13	)	1,288	$	(7.97	)
2021	—	$	—		1,460	$	(7.80	)
2022	—	$	—		274	$	(7.67	)
Total	24,812				3,022

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⁽¹⁾   Represents the price differential between WTI Midland (Midland, Texas) and NYMEX WTI (Cushing, Oklahoma).

⁽²⁾   Represents the price differential between NYMEX WTI (Cushing, Oklahoma) and ICE Brent (North Sea).

Gas Swaps

Contract Period	Sold IF HSC Volumes	Weighted-Average  Contract Price		Purchased IF HSC Volumes		Weighted-Average Contract Price		Net IF HSC Volumes	Weighted-Average Contract Price
	(BBtu)	(per MMBtu)		(BBtu)		(per MMBtu)		(BBtu)	(per MMBtu)
Third quarter 2018	28,218	$	3.25	(7,480	)	$	4.23	20,738	$	2.90
Fourth quarter 2018	28,204	$	3.27	(7,210	)	$	4.27	20,994	$	2.92
2019	41,394	$	3.87	(24,415	)	$	4.34	16,979	$	2.92
Total	97,816			(39,105	)			58,711

Gas Collars

Contract Period	IF HSC  Volumes	Weighted- Average Floor  Price		Weighted- Average Ceiling  Price
	(BBtu)	(per MMBtu)		(per MMBtu)
2019	14,242	$	2.50	$	2.83
Total	14,242

NGL Swaps

	OPIS Ethane Purity Mont Belvieu			OPIS Propane Mont Belvieu Non-TET			OPIS Normal Butane Mont Belvieu Non-TET			OPIS Isobutane Mont Belvieu Non-TET			OPIS Natural Gasoline Mont Belvieu Non-TET
Contract Period	Volumes	Weighted-Average  Contract Price		Volumes	Weighted-Average Contract Price		Volumes	Weighted-Average Contract Price		Volumes	Weighted-Average Contract Price		Volumes	Weighted-Average Contract Price
	(MBbl)	(per Bbl)		(MBbl)	(per Bbl)		(MBbl)	(per Bbl)		(MBbl)	(per Bbl)		(MBbl)	(per Bbl)
Third quarter 2018	1,033	$	10.99	610	$	24.27	93	$	35.70	70	$	35.07	202	$	51.13
Fourth quarter 2018	1,146	$	11.18	671	$	24.39	102	$	35.70	76	$	35.07	208	$	50.99
2019	3,533	$	12.31	1,503	$	27.83	154	$	35.64	117	$	35.70	197	$	50.93
2020	539	$	11.13	—	$	—	—	$	—	—	$	—	—	$	—
Total	6,251			2,784			349			263			607

Commodity Derivative Contracts Entered Into Subsequent to June 30, 2018

Subsequent to June 30, 2018, the Company entered into various commodity derivative contracts, as summarized below:

• NYMEX WTI costless collar contracts for 2020 for a total of 0.8 MMBbl of oil production with contract floor prices of $55.00 per Bbl and contract ceiling prices ranging from $64.50 per Bbl to $67.67 per Bbl;

• fixed price NYMEX WTI-ICE Brent basis swap contracts for 2020 for a total of 0.6 MMBbl of oil production at contract prices ranging from ($8.06) per Bbl to ($8.15) per Bbl;

• fixed price NYMEX WTI-ICE Brent basis swap contracts for 2021 for a total of 1.8 MMBbl of oil production at contract prices ranging from ($7.75) per Bbl to ($8.00) per Bbl;

• fixed price NYMEX WTI-ICE Brent basis swap contracts for 2022 for a total of 2.6 MMBbl of oil production at contract prices ranging from ($7.60) per Bbl to ($7.90) per Bbl; and

• fixed price OPIS Propane Mont Belvieu Non-TET swap contracts for 2019 for a total of 0.5 MMBbl of NGL production at contract prices ranging from $32.21 per Bbl to $32.26 per Bbl.

Derivative Assets and Liabilities Fair Value

The Company’s commodity derivatives are measured at fair value and are included in the accompanying balance sheets as derivative assets and liabilities. The fair value of the commodity derivative contracts was a net liability of $149.4 million and $139.4 million as of June 30, 2018 and December 31, 2017, respectively.

The following table details the fair value of commodity derivative contracts recorded in the accompanying balance sheets, by category:

	As of June 30, 2018		As of December 31, 2017
	(in thousands)
Derivative assets:
Current assets	$	146,329	$	64,266
Noncurrent assets	31,151		40,362
Total derivative assets	$	177,480	$	104,628
Derivative liabilities:
Current liabilities	$	259,338	$	172,582
Noncurrent liabilities	67,583		71,402
Total derivative liabilities	$	326,921	$	243,984

Offsetting of Derivative Assets and Liabilities

As of June 30, 2018, and December 31, 2017, all derivative instruments held by the Company were subject to master netting arrangements with various financial institutions. In general, the terms of the Company’s agreements provide for offsetting of amounts payable or receivable between it and the counterparty, at the election of both parties, for transactions that settle on the same date and in the same currency. The Company’s agreements also provide that in the event of an early termination, the counterparties have the right to offset amounts owed or owing under that and any other agreement with the same counterparty. The Company’s accounting policy is to not offset these positions in its accompanying balance sheets.

The following table provides a reconciliation between the gross assets and liabilities reflected on the accompanying balance sheets and the potential effects of master netting arrangements on the fair value of the Company’s commodity derivative contracts:

	Derivative Assets						Derivative Liabilities
	As of						As of
	June 30,   2018			December 31, 2017			June 30,   2018			December 31, 2017
	(in thousands)
Gross amounts presented in the accompanying balance sheets	$	177,480		$	104,628		$	(326,921	)	$	(243,984	)
Amounts not offset in the accompanying balance sheets	(147,009		)	(100,035		)	147,009			100,035
Net amounts	$	30,471		$	4,593		$	(179,912	)	$	(143,949	)

The following table summarizes the components of the net derivative (gain) loss line item presented in the accompanying statements of operations:

	For the Three Months Ended   June 30,					For the Six Months Ended   June 30,
	2018		2017			2018			2017
	(in thousands)
Derivative settlement (gain) loss:
Oil contracts	$	24,430	$	2,754		$	45,178		$	11,838
Gas contracts	757		(21,751		)	(5,653		)	(39,257		)
NGL contracts	11,478		2,694			21,668			11,109
Total derivative settlement (gain) loss	$	36,665	$	(16,303	)	$	61,193		$	(16,310	)
Net derivative (gain) loss:
Oil contracts	$	22,402	$	(38,194	)	$	36,368		$	(87,784	)
Gas contracts	7,000		(6,038		)	16,990			(50,506		)
NGL contracts	34,347		(10,957		)	17,920			(31,673		)
Total net derivative (gain) loss	$	63,749	$	(55,189	)	$	71,278		$	(169,963	)

Credit Related Contingent Features

As of June 30, 2018, and through the filing of this report, all of the Company’s derivative counterparties were members of the Company’s credit facility lender group. Under the Credit Agreement and derivative contracts, the Company is required to secure mortgages on assets having a value equal to at least 90 percent of the total PV-9 of the Company’s proved oil and gas properties evaluated in the most recent reserve report.

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Fair Value Measurements

6 Months Ended

Jun. 30, 2018

Fair Value Disclosures [Abstract]

Fair Value Disclosures [Text Block]

Note 11 - Fair Value Measurements

The Company follows fair value measurement accounting guidance for all assets and liabilities measured at fair value. This guidance defines fair value as the price that would be received to sell an asset or paid to transfer a liability (an exit price) in an orderly transaction between market participants at the measurement date. Market or observable inputs are the preferred sources of values, followed by assumptions based on hypothetical transactions in the absence of market inputs. The fair value hierarchy for grouping these assets and liabilities is based on the significance level of the following inputs:

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

• Level 2 – quoted prices in active markets for similar assets or liabilities, quoted prices for identical or similar instruments in markets that are not active, and model-derived valuations whose inputs are observable or whose significant value drivers are observable

• Level 3 – significant inputs to the valuation model are unobservable

The following table is a listing of the Company’s assets and liabilities that are measured at fair value in the accompanying balance sheets and where they are classified within the fair value hierarchy as of June 30, 2018:

	Level 1		Level 2		Level 3
	(in thousands)
Assets:
Derivatives (1)	$	—	$	177,480	$	—
Liabilities:
Derivatives (1)	$	—	$	326,921	$	—

__________________________________________

⁽¹⁾  This represents a financial asset or liability that is measured at fair value on a recurring basis.

The following table is a listing of the Company’s assets and liabilities that are measured at fair value in the accompanying balance sheets and where they were classified within the fair value hierarchy as of December 31, 2017:

	Level 1		Level 2		Level 3
	(in thousands)
Assets:
Derivatives (1)	$	—	$	104,628	$	—
Liabilities:
Derivatives (1)	$	—	$	243,984	$	—

____________________________________________

⁽¹⁾  This represents a financial asset or liability that is measured at fair value on a recurring basis.

Both financial and non-financial assets and liabilities are categorized within the above fair value hierarchy based on the lowest level of input that is significant to the fair value measurement. The following is a description of the valuation methodologies used by the Company as well as the general classification of such instruments pursuant to the above fair value hierarchy.

Derivatives

The Company uses Level 2 inputs to measure the fair value of oil, gas, and NGL commodity derivatives. Fair values are based upon interpolated data. The Company derives internal valuation estimates taking into consideration forward commodity price curves, counterparties’ credit ratings, the Company’s credit rating, and the time value of money. These valuations are then compared to the respective counterparties’ mark-to-market statements. The considered factors result in an estimated exit price that management believes provides a reasonable and consistent methodology for valuing derivative instruments. The commodity derivative instruments utilized by the Company are not considered by management to be complex, structured, or illiquid. The oil, gas, and NGL commodity derivative markets are highly active.

Please refer to Note 10 - Derivative Financial Instruments and to Note 11 - Fair Value Measurements in the 2017 Form 10-K for more information regarding the Company’s derivative instruments.

Proved and Unproved Oil and Gas Properties and Other Property and Equipment

Proved oil and gas properties. Proved oil and gas property costs are evaluated for impairment and reduced to fair value when there is an indication the carrying costs may not be recoverable. The Company uses Level 3 inputs and the income valuation technique, which converts future cash flows to a single present value amount, to measure the fair value of proved properties through an application of discount rates and price forecasts representative of the current operating environment, as selected by the Company’s management. The calculation of the discount rates is based on the best information available and the rates used ranged from 10 percent to 15 percent based on the reservoir-specific weightings of future estimated proved and unproved cash flows as of June 30, 2018, and December 31, 2017. The Company believes the discount rates are representative of current market conditions and considers estimates of future cash payments, reserve categories, expectations of possible variations in the amount and/or timing of cash flows, the risk premium, and nonperformance risk. The prices for oil and gas are forecast based on NYMEX strip pricing, adjusted for basis differentials, for the first five years, after which a flat terminal price is used for each commodity stream. The prices for NGLs are forecast using OPIS pricing, for as long as the market is actively trading, after which a flat terminal price is used. Future operating costs are also adjusted as deemed appropriate for these estimates. There were no material impairments of proved properties during the three and six months ended June 30, 2018, or 2017.

Unproved oil and gas properties. Unproved oil and gas property costs are evaluated for impairment and reduced to fair value when there is an indication that the carrying costs may not be recoverable.  Lease acquisition costs that are not individually significant are aggregated by prospect and the portion of such costs estimated to be nonproductive prior to lease expiration are amortized over the appropriate period. The estimate of what could be nonproductive is based on historical trends or other information, including current drilling plans and the Company’s intent to renew leases. To measure the fair value of unproved properties, the Company uses a market approach, which takes into account the following significant assumptions: remaining lease terms, future development plans, risk-weighted potential resource recovery, estimated reserve values, and estimated acreage value based on price(s) received for similar, recent acreage transactions by the Company or other market participants. During the three and six months ended June 30, 2018, the Company recorded $11.9 million and $17.6 million, respectively, in abandonment and impairment of unproved properties expense related to lease expirations. There were no material abandonments or impairments of unproved properties expenses for the three or six months ended June 30, 2017.

Oil and gas properties held for sale. Proved and unproved oil and gas properties classified as held for sale, including the corresponding asset retirement obligation liability, are valued using a market approach, based on an estimated net selling price, as evidenced by the most current bid prices received from third parties, if available. If an estimated selling price is not available, the Company utilizes the various income valuation techniques discussed above. Any initial write-down and subsequent changes to the fair value less estimated cost to sell is included within the net gain (loss) on divestiture activity line item in the accompanying statements of operations.

There were no material assets held for sale that were recorded at fair value as of June 30, 2018, or as of December 31, 2017. For the six months ended June 30, 2017, the Company recorded a $526.5 million write-down on assets previously held for sale. Please refer to Note 3 - Divestitures, Assets Held for Sale, and Acquisitions above as well as in the 2017 Form 10-K for more information regarding the Company’s oil and gas properties held for sale.

Long-Term Debt

The following table reflects the fair value of the Senior Notes and Senior Convertible Notes measured using Level 1 inputs based on quoted secondary market trading prices. These notes were not presented at fair value on the accompanying balance sheets as of June 30, 2018, or December 31, 2017, as they were recorded at carrying value, net of any unamortized discounts and deferred financing costs. On July 16, 2018, the 2021 Senior Notes were redeemed. Please refer to Note 5 - Long-Term Debt for additional discussion.

	As of June 30, 2018				As of December 31, 2017
	Principal Amount		Fair Value		Principal Amount		Fair Value
	(in thousands)
6.50% Senior Notes due 2021	$	344,611	$	352,634	$	344,611	$	351,682
6.125% Senior Notes due 2022	$	561,796	$	573,847	$	561,796	$	571,627
6.50% Senior Notes due 2023	$	394,985	$	401,380	$	394,985	$	403,434
5.0% Senior Notes due 2024	$	500,000	$	468,750	$	500,000	$	483,440
5.625% Senior Notes due 2025	$	500,000	$	485,000	$	500,000	$	494,355
6.75% Senior Notes due 2026	$	500,000	$	502,350	$	500,000	$	516,350
1.50% Senior Convertible Notes due 2021	$	172,500	$	178,446	$	172,500	$	168,291

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Summary of Significant Accounting Policies (Policies)

6 Months Ended

Jun. 30, 2018

Accounting Policies [Abstract]

Basis of Presentation, Policy

Basis of Presentation

The accompanying unaudited condensed consolidated financial statements include the accounts of SM Energy and have been prepared in accordance with accounting principles generally accepted in the United States (“GAAP”) for interim financial information, the instructions to Quarterly Report on Form 10-Q, and Regulation S-X. These financial statements do not include all information and notes required by GAAP for annual financial statements. However, except as disclosed herein, there has been no material change in the information disclosed in the notes to the consolidated financial statements included in SM Energy’s Annual Report on Form 10-K for the year ended December 31, 2017 (the “2017 Form 10-K”). In the opinion of management, all adjustments, consisting of normal recurring adjustments considered necessary for a fair presentation of interim financial information, have been included. Operating results for the periods presented are not necessarily indicative of expected results for the full year. In connection with the preparation of the Company’s unaudited condensed consolidated financial statements, the Company evaluated events subsequent to the balance sheet date of June 30, 2018, and through the filing of this report. Certain prior period amounts have been reclassified to conform to the current presentation on the accompanying unaudited condensed consolidated financial statements.

Derivatives, Policy

Derivatives

The Company uses Level 2 inputs to measure the fair value of oil, gas, and NGL commodity derivatives. Fair values are based upon interpolated data. The Company derives internal valuation estimates taking into consideration forward commodity price curves, counterparties’ credit ratings, the Company’s credit rating, and the time value of money. These valuations are then compared to the respective counterparties’ mark-to-market statements. The considered factors result in an estimated exit price that management believes provides a reasonable and consistent methodology for valuing derivative instruments. The commodity derivative instruments utilized by the Company are not considered by management to be complex, structured, or illiquid. The oil, gas, and NGL commodity derivative markets are highly active.

Please refer to Note 10 - Derivative Financial Instruments and to Note 11 - Fair Value Measurements in the 2017 Form 10-K for more information regarding the Company’s derivative instruments.

Proved and Unproved Oil and Gas Properties and Other Property and Equipment, Policy

Proved and Unproved Oil and Gas Properties and Other Property and Equipment

Proved oil and gas properties. Proved oil and gas property costs are evaluated for impairment and reduced to fair value when there is an indication the carrying costs may not be recoverable. The Company uses Level 3 inputs and the income valuation technique, which converts future cash flows to a single present value amount, to measure the fair value of proved properties through an application of discount rates and price forecasts representative of the current operating environment, as selected by the Company’s management. The calculation of the discount rates is based on the best information available and the rates used ranged from 10 percent to 15 percent based on the reservoir-specific weightings of future estimated proved and unproved cash flows as of June 30, 2018, and December 31, 2017. The Company believes the discount rates are representative of current market conditions and considers estimates of future cash payments, reserve categories, expectations of possible variations in the amount and/or timing of cash flows, the risk premium, and nonperformance risk. The prices for oil and gas are forecast based on NYMEX strip pricing, adjusted for basis differentials, for the first five years, after which a flat terminal price is used for each commodity stream. The prices for NGLs are forecast using OPIS pricing, for as long as the market is actively trading, after which a flat terminal price is used. Future operating costs are also adjusted as deemed appropriate for these estimates. There were no material impairments of proved properties during the three and six months ended June 30, 2018, or 2017.

Unproved oil and gas properties. Unproved oil and gas property costs are evaluated for impairment and reduced to fair value when there is an indication that the carrying costs may not be recoverable.  Lease acquisition costs that are not individually significant are aggregated by prospect and the portion of such costs estimated to be nonproductive prior to lease expiration are amortized over the appropriate period. The estimate of what could be nonproductive is based on historical trends or other information, including current drilling plans and the Company’s intent to renew leases. To measure the fair value of unproved properties, the Company uses a market approach, which takes into account the following significant assumptions: remaining lease terms, future development plans, risk-weighted potential resource recovery, estimated reserve values, and estimated acreage value based on price(s) received for similar, recent acreage transactions by the Company or other market participants. During the three and six months ended June 30, 2018, the Company recorded $11.9 million and $17.6 million, respectively, in abandonment and impairment of unproved properties expense related to lease expirations. There were no material abandonments or impairments of unproved properties expenses for the three or six months ended June 30, 2017.

Oil and gas properties held for sale. Proved and unproved oil and gas properties classified as held for sale, including the corresponding asset retirement obligation liability, are valued using a market approach, based on an estimated net selling price, as evidenced by the most current bid prices received from third parties, if available. If an estimated selling price is not available, the Company utilizes the various income valuation techniques discussed above. Any initial write-down and subsequent changes to the fair value less estimated cost to sell is included within the net gain (loss) on divestiture activity line item in the accompanying statements of operations.

There were no material assets held for sale that were recorded at fair value as of June 30, 2018, or as of December 31, 2017. For the six months ended June 30, 2017, the Company recorded a $526.5 million write-down on assets previously held for sale. Please refer to Note 3 - Divestitures, Assets Held for Sale, and Acquisitions above as well as in the 2017 Form 10-K for more information regarding the Company’s oil and gas properties held for sale.

New Accounting Pronouncements, Policy [Policy Text Block]

Recently Issued Accounting Standards

Effective December 31, 2017, the Company early adopted, on a retrospective basis, Financial Accounting Standards Board (“FASB”) Accounting Standards Update (“ASU”) No. 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments (“ASU 2016-15”) and FASB ASU No. 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash (“ASU 2016-18”). ASU 2016-15 is intended to reduce diversity in practice in how certain transactions are classified in the statement of cash flows and ASU 2016-18 is intended to clarify guidance on the classification and presentation of restricted cash and restricted cash equivalents in the statement of cash flows. Please refer to Note 1 - Summary of Significant Accounting Policies in the 2017 Form 10-K for more information.

The accompanying unaudited condensed consolidated statements of cash flows (“accompanying statements of cash flows”) line items that were adjusted as a result of the adoption of ASU 2016-15 and ASU 2016-18 for the six months ended June 30, 2017, are summarized as follows:

	For the Six Months Ended June 30, 2017
	As Reported			As Adjusted
	(in thousands)
Cash flows from operating activities:
Non-cash (gain) loss on extinguishment of debt, net	$	22		N/A
Loss on extinguishment of debt	N/A			$	35
Net cash provided by operating activities	$	242,115		$	242,128
Cash flows from investing activities:
Other, net	$	3,000		N/A
Net cash provided by (used in) investing activities	$	314,364		$	311,364
Cash flows from financing activities:
Cash paid for extinguishment of debt	N/A			$	(13	)
Net cash used in financing activities	$	(6,330	)	$	(6,343	)
Net change in cash and cash equivalents	$	550,149		N/A
Net change in cash, cash equivalents, and restricted cash	N/A			$	547,149
Cash and cash equivalents at beginning of period	$	9,372		N/A
Cash, cash equivalents, and restricted cash at beginning of period	N/A			$	12,372
Cash and cash equivalents at end of period	$	559,521		N/A
Cash, cash equivalents, and restricted cash at end of period	N/A			$	559,521

The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the accompanying balance sheets:

	As of June 30, 2018		As of December 31, 2017
	(in thousands)
Cash and cash equivalents	$	615,906	$	313,943
Restricted cash	—		—
Total cash, cash equivalents, and restricted cash	$	615,906	$	313,943

Effective January 1, 2018, the Company adopted FASB ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606) and all related ASUs (“ASU 2014-09”). Under the new guidance, revenue is recognized when a customer obtains control of promised goods or services in an amount that reflects the consideration the entity expects to receive in exchange for those goods or services. The Company adopted ASU 2014-09 using the modified retrospective transition method, which was applied to all active contracts as of the effective date. The adoption of ASU 2014-09 did not result in a change to current or prior period results nor did it result in a material change to the Company’s business processes, systems, or controls. However, upon adopting ASU 2014-09, the Company expanded its disclosures to comply with the expanded disclosure requirements of ASU 2014-09. Please refer to Note 2 - Revenue from Contracts with Customers for additional discussion.

Effective January 1, 2018, the Company adopted FASB ASU No. 2017-07, Compensation-Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost (“ASU 2017-07”). ASU 2017-07 requires presentation of service cost in the same line item(s) as other compensation costs arising from services rendered by employees during the period and presentation of the remaining components of net benefit cost in a separate line item, outside of operating items, which the Company adopted with retrospective application. In addition, only the service component of the net benefit cost is eligible for capitalization, which the Company adopted with prospective application. Please refer to Note 1 - Summary of Significant Accounting Policies in the 2017 Form 10-K for more information.

The accompanying statements of operations line items that were adjusted as a result of the adoption of ASU 2017-07 for the three and six months ended June 30, 2017, are summarized as follows:

	For the Three Months Ended June 30, 2017						For the Six Months Ended June 30, 2017
	As Reported			As Adjusted			As Reported		As Adjusted
	(in thousands)
Operating expenses:
Exploration	$	13,072		$	12,983		$	25,050	$	24,800
General and administrative	$	28,460		$	28,237		$	57,684	$	57,054
Total operating expenses	$	268,359		$	268,047		$	475,504	$	474,624
Income (loss) from operations	$	(147,638	)	$	(147,326	)	$	17,955	$	18,835
Other non-operating income, net	$	1,265		$	953		$	1,600	$	720

Effective January 1, 2018, the Company early adopted ASU No. 2018-02, Income Statement-Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income (“ASU 2018-02”) by applying the changes in the period of adoption. ASU 2018-02 permits entities to reclassify tax effects stranded in accumulated other comprehensive income (loss) to retained earnings as a result of the enactment into law on December 22, 2017, of H.R.1, formally the Tax Cuts and Jobs Act (the “2017 Tax Act”). As a result of adopting ASU 2018-02, the Company reclassified $3.0 million of tax effects stranded in accumulated other comprehensive loss to retained earnings as of January 1, 2018. The Company’s policy for releasing income tax effects within accumulated other comprehensive loss is an incremental, unit-of-account approach.

In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) (“ASU 2016-02”), which requires recognition of right-of-use assets and lease payment liabilities on the balance sheet by lessees for virtually all leases currently classified as operating leases. The scope of ASU 2016-02 does not apply to leases used in the exploration or use of minerals, oil, natural gas, or other similar non-regenerative resources. Under ASU 2016-02, companies are permitted to make a policy election to not recognize lease assets or liabilities when the term of the lease is less than twelve months. For agreements that contain both lease and non-lease components, companies are also permitted to make a policy election to combine both the lease and non-lease components together and account for these arrangements as a single lease. The Company has established a cross-functional project team and is leveraging external consultants to evaluate the impacts of ASU 2016-02, which includes an analysis of non-cancelable leases, drilling rig contracts, certain midstream agreements, and other existing arrangements that may contain a lease component. Further, the Company is also evaluating policies, controls, and processes that will be necessary to support the additional accounting and disclosure requirements. The Company is also in the process of designing and implementing a lease administration system that will support the on-going maintenance and accounting for leases after adoption. The Company will adopt ASU 2016-02 on January 1, 2019, and plans on using the modified retrospective approach. Adoption of this guidance is expected to result in an increase in right-of-use assets and related liabilities on the Company’s consolidated balance sheets; however, the full impact to the Company’s financial statements and related disclosures is still being evaluated.

In January 2018, the FASB issued ASU No. 2018-01, Leases (Topic 842): Land Easement Practical Expedient for Transition to Topic 842 (“ASU 2018-01”), which provides an optional transitional practical expedient that allows entities to exclude from evaluation land easements that existed or expired before adoption of ASU 2016-02. Companies that elect this practical expedient will need to evaluate new or modified land easements after adopting ASU 2016-02. If this practical expedient is not elected, companies will need to evaluate all existing or expired land easements as part of the overall adoption of ASU 2016-02. The Company expects to elect to use this practical expedient as outlined in ASU 2018-01 and will adopt ASU 2018-01 at the same time it adopts ASU 2016-02.

In July 2018, the FASB issued ASU No. 2018-11, Leases (Topic 842): Targeted Improvements (“ASU 2018-11”). ASU 2018-11 provides an additional transition method for adopting ASU 2016-02, as well as provides lessors with a practical expedient when applying ASU 2016-02 to certain leases. The Company is currently evaluating ASU 2018-11 as part of its overall assessment of ASU 2016-02, and will adopt ASU 2018-11 at the same time it adopts ASU 2016-02.

Other than as disclosed above or in the 2017 Form 10-K, there are no other ASUs applicable to the Company that would have a material effect on the Company’s consolidated financial statements and related disclosures that have been issued but not yet adopted by the Company as of June 30, 2018, and through the filing of this report.

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Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2018

Accounting Policies [Abstract]

Schedule of New Accounting Pronouncements and Changes in Accounting Principles

The accompanying unaudited condensed consolidated statements of cash flows (“accompanying statements of cash flows”) line items that were adjusted as a result of the adoption of ASU 2016-15 and ASU 2016-18 for the six months ended June 30, 2017, are summarized as follows:

	For the Six Months Ended June 30, 2017
	As Reported			As Adjusted
	(in thousands)
Cash flows from operating activities:
Non-cash (gain) loss on extinguishment of debt, net	$	22		N/A
Loss on extinguishment of debt	N/A			$	35
Net cash provided by operating activities	$	242,115		$	242,128
Cash flows from investing activities:
Other, net	$	3,000		N/A
Net cash provided by (used in) investing activities	$	314,364		$	311,364
Cash flows from financing activities:
Cash paid for extinguishment of debt	N/A			$	(13	)
Net cash used in financing activities	$	(6,330	)	$	(6,343	)
Net change in cash and cash equivalents	$	550,149		N/A
Net change in cash, cash equivalents, and restricted cash	N/A			$	547,149
Cash and cash equivalents at beginning of period	$	9,372		N/A
Cash, cash equivalents, and restricted cash at beginning of period	N/A			$	12,372
Cash and cash equivalents at end of period	$	559,521		N/A
Cash, cash equivalents, and restricted cash at end of period	N/A			$	559,521

The accompanying statements of operations line items that were adjusted as a result of the adoption of ASU 2017-07 for the three and six months ended June 30, 2017, are summarized as follows:

	For the Three Months Ended June 30, 2017						For the Six Months Ended June 30, 2017
	As Reported			As Adjusted			As Reported		As Adjusted
	(in thousands)
Operating expenses:
Exploration	$	13,072		$	12,983		$	25,050	$	24,800
General and administrative	$	28,460		$	28,237		$	57,684	$	57,054
Total operating expenses	$	268,359		$	268,047		$	475,504	$	474,624
Income (loss) from operations	$	(147,638	)	$	(147,326	)	$	17,955	$	18,835
Other non-operating income, net	$	1,265		$	953		$	1,600	$	720

Schedule of cash and cash equivalents, and restricted cash

The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the accompanying balance sheets:

	As of June 30, 2018		As of December 31, 2017
	(in thousands)
Cash and cash equivalents	$	615,906	$	313,943
Restricted cash	—		—
Total cash, cash equivalents, and restricted cash	$	615,906	$	313,943

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Revenue from Contracts with Customers (Tables)

6 Months Ended

Jun. 30, 2018

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

The tables below present the disaggregation of oil, gas, and NGL production revenue by product type for each of the Company’s operating regions for the three and six months ended June 30, 2018, and 2017:

	Permian						South Texas & Gulf Coast						Rocky Mountain						Total
	Three Months Ended June 30,						Three Months Ended June 30,						Three Months Ended June 30,						Three Months Ended June 30,
	2018			2017			2018			2017			2018			2017			2018			2017
	(in thousands)
Oil, gas, and NGL production revenue:
Oil production revenue	$	227,636		$	78,554		$	19,346		$	13,072		$	19,168		$	37,248		$	266,150		$	128,874
Gas production revenue	31,734			12,937			52,235			87,760			95			1,043			84,064			101,740
NGL production revenue	129			107			52,248			53,558			(33		)	660			52,344			54,325
Total	$	259,499		$	91,598		$	123,829		$	154,390		$	19,230		$	38,951		$	402,558		$	284,939
Relative percentage	64		%	32		%	31		%	54		%	5		%	14		%	100		%	100		%

____________________________________________

Note: Amounts may not calculate due to rounding.

	Permian						South Texas & Gulf Coast						Rocky Mountain						Total
	Six Months Ended June 30,						Six Months Ended June 30,						Six Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017			2018			2017			2018			2017
	(in thousands)
Oil, gas, and NGL production revenue:
Oil production revenue	$	433,430		$	160,053		$	38,929		$	51,936		$	54,851		$	84,509		$	527,210		$	296,498
Gas production revenue	56,611			24,246			104,968			175,961			1,594			2,714			163,173			202,921
NGL production revenue	253			254			94,018			116,915			790			1,549			95,061			118,718
Total	$	490,294		$	184,553		$	237,915		$	344,812		$	57,235		$	88,772		$	785,444		$	618,137
Relative percentage	63		%	30		%	30		%	56		%	7		%	14		%	100		%	100		%

____________________________________________

Note: Amounts may not calculate due to rounding.

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Divestitures, Assets Held for Sale, and Acquisitions (Tables)

6 Months Ended

Jun. 30, 2018

Divestitures, Assets Held for Sale, and Acquisitions [Abstract]

Disposal Groups, Including Discontinued Operations [Table Text Block]

The following table presents loss before income taxes from the Divide County, North Dakota assets sold for the three and six months ended June 30, 2018, and 2017. The Divide County Divestiture was considered a disposal of a significant asset group.

	For the Three Months Ended June 30,						For the Six Months Ended June 30,
	2018			2017			2018			2017
	(in thousands)
Loss before income taxes (1)	$	(17,478	)	$	(153,442	)	$	(28,975	)	$	(486,161	)

____________________________________________

⁽¹⁾  Loss before income taxes reflects oil, gas, and NGL production revenue, less oil, gas, and NGL production expense, depletion, depreciation, amortization, and asset retirement obligation liability accretion expense, impairment expense, and net loss on divestiture activity.

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Income Taxes (Tables)

6 Months Ended

Jun. 30, 2018

Income Tax Disclosure [Abstract]

Schedule of provision for income taxes

The provision for income taxes for the three and six months ended June 30, 2018, and 2017, consisted of the following:

	For the Three Months Ended   June 30,						For the Six Months Ended   June 30,
	2018			2017			2018			2017
	(in thousands)
Current portion of income tax (expense) benefit:
Federal	$	—		$	4,607		$	—		$	(2,832	)
State	40			2,439			(585		)	(1,403		)
Deferred portion of income tax (expense) benefit	861			64,015			(97,505		)	30,790
Income tax (expense) benefit	$	901		$	71,061		$	(98,090	)	$	26,555
Effective tax rate	(5.5		)%	37.2		%	22.7		%	36.9		%

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Long-Term Debt (Tables)

6 Months Ended

Jun. 30, 2018

Debt Disclosure [Abstract]

Schedule of Credit Agreement Facilities [Table Text Block]

The following table presents the outstanding balance, total amount of letters of credit outstanding, and available borrowing capacity under the Credit Agreement as of July 25, 2018, June 30, 2018, and December 31, 2017:

	As of July 25, 2018		As of June 30, 2018		As of December 31, 2017
	(in thousands)
Credit facility balance (1)	$	—	$	—	$	—
Letters of credit (2)	200		200		200
Available borrowing capacity	999,800		999,800		924,800
Total aggregate lender commitment amount	$	1,000,000	$	1,000,000	$	925,000

____________________________________________

⁽¹⁾  Unamortized deferred financing costs attributable to the credit facility are presented as a component of other noncurrent assets on the accompanying balance sheets and totaled $2.4 million and $3.1 million as of June 30, 2018, and December 31, 2017, respectively.

⁽²⁾  Letters of credit outstanding reduce the amount available under the credit facility on a dollar-for-dollar basis.

Schedule of Senior Notes [Table Text Block]

The current portion of Senior Notes, net of unamortized deferred financing costs and noncurrent portion of Senior Notes, net of unamortized deferred financing costs lines on the accompanying balance sheets as of June 30, 2018, and December 31, 2017, consisted of the following:

	As of June 30, 2018						As of December 31, 2017
	Principal Amount		Unamortized Deferred Financing Costs		Senior Notes, Net of Unamortized Deferred Financing Costs		Principal Amount		Unamortized Deferred Financing Costs		Senior Notes, Net of Unamortized Deferred Financing Costs
	(in thousands)
6.50% Senior Notes due 2021	$	344,611	$	2,310	$	342,301	$	344,611	$	2,656	$	341,955
6.125% Senior Notes due 2022	561,796		5,211		556,585		561,796		5,800		555,996
6.50% Senior Notes due 2023	394,985		3,342		391,643		394,985		3,707		391,278
5.0% Senior Notes due 2024	500,000		5,149		494,851		500,000		5,610		494,390
5.625% Senior Notes due 2025	500,000		6,261		493,739		500,000		6,714		493,286
6.75% Senior Notes due 2026	500,000		6,824		493,176		500,000		7,242		492,758
Total	$	2,801,392	$	29,097	$	2,772,295	$	2,801,392	$	31,729	$	2,769,663

Schedule of Senior Convertible Notes [Table Text Block]

The Senior Convertible Notes, net of unamortized discount and deferred financing costs line on the accompanying balance sheets as of June 30, 2018, and December 31, 2017, consisted of the following:

	As of June 30, 2018			As of December 31, 2017
	(in thousands)
Principal amount of Senior Convertible Notes	$	172,500		$	172,500
Unamortized debt discount	(26,319		)	(30,183		)
Unamortized deferred financing costs	(2,751		)	(3,210		)
Senior Convertible Notes, net of unamortized discount and deferred financing costs	$	143,430		$	139,107

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Pension Benefits (Tables)

6 Months Ended

Jun. 30, 2018

Defined Benefit Plan [Abstract]

Components of the net periodic benefit cost for the Pension Plans [Table Text Block]

The following table presents the components of the net periodic benefit cost for the Pension Plans:

	For the Three Months Ended   June 30,						For the Six Months Ended   June 30,
	2018			2017			2018			2017
	(in thousands)
Service cost	$	1,705		$	1,269		$	3,365		$	3,319
Interest cost	637			617			1,310			1,344
Expected return on plan assets that reduces periodic pension benefit cost	(370		)	(563		)	(931		)	(1,122		)
Amortization of prior service cost	5			5			9			9
Amortization of net actuarial loss	340			253			664			649
Net periodic benefit cost	$	2,317		$	1,581		$	4,417		$	4,199

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Earnings per Share (Tables)

6 Months Ended

Jun. 30, 2018

Earnings Per Share [Abstract]

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]

The following table presents the weighted-average anti-dilutive securities for the periods presented:

	For the Three Months Ended   June 30,		For the Six Months Ended   June 30,
	2018	2017	2018	2017
	(in thousands)
Anti-dilutive	—	44	—	59

Schedule of calculations of basic and diluted net loss per common share

The following table sets forth the calculations of basic and diluted net income (loss) per common share:

	For the Three Months Ended   June 30,					For the Six Months Ended   June 30,
	2018		2017			2018		2017
	(in thousands, except per share data)
Net income (loss)	$	17,197	$	(119,907	)	$	334,598	$	(45,473	)
Basic weighted-average common shares outstanding	111,701		111,277			111,698		111,274
Dilutive effect of non-vested RSUs and contingent PSUs	1,929		—			1,569		—
Dilutive effect of Senior Convertible Notes	—		—			—		—
Diluted weighted-average common shares outstanding	113,630		111,277			113,267		111,274
Basic net income (loss) per common share	$	0.15	$	(1.08	)	$	3.00	$	(0.41	)
Diluted net income (loss) per common share	$	0.15	$	(1.08	)	$	2.95	$	(0.41	)

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Derivative Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2018

Derivative Instruments Not Designated as Hedging Instruments [Abstract]

Schedule of notional amounts of outstanding derivative positions

As of June 30, 2018, the Company had commodity derivative contracts outstanding as summarized in the tables below:

Oil Swaps

Contract Period	NYMEX WTI Volumes	Weighted-Average  Contract Price
	(MBbl)	(per Bbl)
Third quarter 2018	1,769	$	49.77
Fourth quarter 2018	1,894	$	49.87
2019	1,940	$	50.70
Total	5,603

Oil Collars

Contract Period	NYMEX WTI  Volumes	Weighted- Average Floor  Price		Weighted- Average Ceiling  Price
	(MBbl)	(per Bbl)		(per Bbl)
Third quarter 2018	1,948	$	50.00	$	58.61
Fourth quarter 2018	2,222	$	50.00	$	58.44
2019	10,055	$	50.59	$	63.62
2020	366	$	55.00	$	67.01
Total	14,591

Oil Basis Swaps

Contract Period	WTI Midland-NYMEX WTI Volumes	Weighted-Average  Contract Price (1)			NYMEX WTI-ICE Brent Volumes	Weighted-Average Contract Price (2)
	(MBbl)	(per Bbl)			(MBbl)	(per Bbl)
Third quarter 2018	3,018	$	(1.06	)	—	$	—
Fourth quarter 2018	3,327	$	(1.08	)	—	$	—
2019	11,217	$	(3.36	)	—	$	—
2020	7,250	$	(1.13	)	1,288	$	(7.97	)
2021	—	$	—		1,460	$	(7.80	)
2022	—	$	—		274	$	(7.67	)
Total	24,812				3,022

____________________________________________

⁽¹⁾   Represents the price differential between WTI Midland (Midland, Texas) and NYMEX WTI (Cushing, Oklahoma).

⁽²⁾   Represents the price differential between NYMEX WTI (Cushing, Oklahoma) and ICE Brent (North Sea).

Gas Swaps

Contract Period	Sold IF HSC Volumes	Weighted-Average  Contract Price		Purchased IF HSC Volumes		Weighted-Average Contract Price		Net IF HSC Volumes	Weighted-Average Contract Price
	(BBtu)	(per MMBtu)		(BBtu)		(per MMBtu)		(BBtu)	(per MMBtu)
Third quarter 2018	28,218	$	3.25	(7,480	)	$	4.23	20,738	$	2.90
Fourth quarter 2018	28,204	$	3.27	(7,210	)	$	4.27	20,994	$	2.92
2019	41,394	$	3.87	(24,415	)	$	4.34	16,979	$	2.92
Total	97,816			(39,105	)			58,711

Gas Collars

Contract Period	IF HSC  Volumes	Weighted- Average Floor  Price		Weighted- Average Ceiling  Price
	(BBtu)	(per MMBtu)		(per MMBtu)
2019	14,242	$	2.50	$	2.83
Total	14,242

NGL Swaps

	OPIS Ethane Purity Mont Belvieu			OPIS Propane Mont Belvieu Non-TET			OPIS Normal Butane Mont Belvieu Non-TET			OPIS Isobutane Mont Belvieu Non-TET			OPIS Natural Gasoline Mont Belvieu Non-TET
Contract Period	Volumes	Weighted-Average  Contract Price		Volumes	Weighted-Average Contract Price		Volumes	Weighted-Average Contract Price		Volumes	Weighted-Average Contract Price		Volumes	Weighted-Average Contract Price
	(MBbl)	(per Bbl)		(MBbl)	(per Bbl)		(MBbl)	(per Bbl)		(MBbl)	(per Bbl)		(MBbl)	(per Bbl)
Third quarter 2018	1,033	$	10.99	610	$	24.27	93	$	35.70	70	$	35.07	202	$	51.13
Fourth quarter 2018	1,146	$	11.18	671	$	24.39	102	$	35.70	76	$	35.07	208	$	50.99
2019	3,533	$	12.31	1,503	$	27.83	154	$	35.64	117	$	35.70	197	$	50.93
2020	539	$	11.13	—	$	—	—	$	—	—	$	—	—	$	—
Total	6,251			2,784			349			263			607

Schedule of fair value of derivatives in accompanying balance sheets

The following table details the fair value of commodity derivative contracts recorded in the accompanying balance sheets, by category:

	As of June 30, 2018		As of December 31, 2017
	(in thousands)
Derivative assets:
Current assets	$	146,329	$	64,266
Noncurrent assets	31,151		40,362
Total derivative assets	$	177,480	$	104,628
Derivative liabilities:
Current liabilities	$	259,338	$	172,582
Noncurrent liabilities	67,583		71,402
Total derivative liabilities	$	326,921	$	243,984

Schedule of the potential effects of master netting arrangements

The following table provides a reconciliation between the gross assets and liabilities reflected on the accompanying balance sheets and the potential effects of master netting arrangements on the fair value of the Company’s commodity derivative contracts:

	Derivative Assets						Derivative Liabilities
	As of						As of
	June 30,   2018			December 31, 2017			June 30,   2018			December 31, 2017
	(in thousands)
Gross amounts presented in the accompanying balance sheets	$	177,480		$	104,628		$	(326,921	)	$	(243,984	)
Amounts not offset in the accompanying balance sheets	(147,009		)	(100,035		)	147,009			100,035
Net amounts	$	30,471		$	4,593		$	(179,912	)	$	(143,949	)

Schedule of derivative (gain) loss

The following table summarizes the components of the net derivative (gain) loss line item presented in the accompanying statements of operations:

	For the Three Months Ended   June 30,					For the Six Months Ended   June 30,
	2018		2017			2018			2017
	(in thousands)
Derivative settlement (gain) loss:
Oil contracts	$	24,430	$	2,754		$	45,178		$	11,838
Gas contracts	757		(21,751		)	(5,653		)	(39,257		)
NGL contracts	11,478		2,694			21,668			11,109
Total derivative settlement (gain) loss	$	36,665	$	(16,303	)	$	61,193		$	(16,310	)
Net derivative (gain) loss:
Oil contracts	$	22,402	$	(38,194	)	$	36,368		$	(87,784	)
Gas contracts	7,000		(6,038		)	16,990			(50,506		)
NGL contracts	34,347		(10,957		)	17,920			(31,673		)
Total net derivative (gain) loss	$	63,749	$	(55,189	)	$	71,278		$	(169,963	)

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Fair Value Measurements Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2018

Fair Value Disclosures [Abstract]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

The following table is a listing of the Company’s assets and liabilities that are measured at fair value in the accompanying balance sheets and where they are classified within the fair value hierarchy as of June 30, 2018:

	Level 1		Level 2		Level 3
	(in thousands)
Assets:
Derivatives (1)	$	—	$	177,480	$	—
Liabilities:
Derivatives (1)	$	—	$	326,921	$	—

__________________________________________

⁽¹⁾  This represents a financial asset or liability that is measured at fair value on a recurring basis.

The following table is a listing of the Company’s assets and liabilities that are measured at fair value in the accompanying balance sheets and where they were classified within the fair value hierarchy as of December 31, 2017:

	Level 1		Level 2		Level 3
	(in thousands)
Assets:
Derivatives (1)	$	—	$	104,628	$	—
Liabilities:
Derivatives (1)	$	—	$	243,984	$	—

____________________________________________

⁽¹⁾  This represents a financial asset or liability that is measured at fair value on a recurring basis.

Long Term Debt Fair Value [Table Text Block]

The following table reflects the fair value of the Senior Notes and Senior Convertible Notes measured using Level 1 inputs based on quoted secondary market trading prices. These notes were not presented at fair value on the accompanying balance sheets as of June 30, 2018, or December 31, 2017, as they were recorded at carrying value, net of any unamortized discounts and deferred financing costs. On July 16, 2018, the 2021 Senior Notes were redeemed. Please refer to Note 5 - Long-Term Debt for additional discussion.

	As of June 30, 2018				As of December 31, 2017
	Principal Amount		Fair Value		Principal Amount		Fair Value
	(in thousands)
6.50% Senior Notes due 2021	$	344,611	$	352,634	$	344,611	$	351,682
6.125% Senior Notes due 2022	$	561,796	$	573,847	$	561,796	$	571,627
6.50% Senior Notes due 2023	$	394,985	$	401,380	$	394,985	$	403,434
5.0% Senior Notes due 2024	$	500,000	$	468,750	$	500,000	$	483,440
5.625% Senior Notes due 2025	$	500,000	$	485,000	$	500,000	$	494,355
6.75% Senior Notes due 2026	$	500,000	$	502,350	$	500,000	$	516,350
1.50% Senior Convertible Notes due 2021	$	172,500	$	178,446	$	172,500	$	168,291

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Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands		3 Months Ended			6 Months Ended
		Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Cash Flows [Abstract]
Non-cash (gain) loss on extinguishment of debt, net					$ 0	$ 22
Loss on extinguishment of debt		$ 0		$ 0	0	35
Net cash provided by operating activities					311,518	242,128
Net cash provided by (used in) investing activities					(5,719)	311,364
Cash paid for extinguishment of debt					0	(13)
Net cash used in financing activities					(3,836)	(6,343)
Net change in cash, cash equivalents, and restricted cash						547,149
Cash, cash equivalents, and restricted cash at beginning of period	[1]		$ 313,943		313,943	12,372
Cash, cash equivalents, and restricted cash at end of period	[1]	615,906		559,521	615,906	559,521
Income Statement [Abstract]
Net income (loss)		17,197		(119,907)	334,598	(45,473)
Depreciation, depletion, amortization and asset retirement liability accretion expense		151,765		153,232	282,238	291,044
Exploration		14,056		12,983	27,783	24,800
General and administrative		28,920		28,237	56,602	57,054
Total operating expenses		387,768		268,047	698,295	474,624
Income (loss) from operations		56,148		(147,326)	515,216	18,835
Other non-operating income, net		1,802		953	$ 2,211	720
Scenario, Previously Reported [Member]
Statement of Cash Flows [Abstract]
Non-cash (gain) loss on extinguishment of debt, net						22
Net cash provided by operating activities						242,115
Other, net						3,000
Net cash provided by (used in) investing activities						314,364
Net cash used in financing activities						(6,330)
Net change in cash and cash equivalents						550,149
Cash and cash equivalents at beginning of period						9,372
Cash and cash equivalents at end of period				559,521		559,521
Income Statement [Abstract]
Exploration				13,072		25,050
General and administrative				28,460		57,684
Total operating expenses				268,359		475,504
Income (loss) from operations				(147,638)		17,955
Other non-operating income, net				$ 1,265		$ 1,600
Correction of Immaterial Errors Before Tax [Member]
Income Statement [Abstract]
Assets held for sale, loss (gain) on write-down		17,700
Depreciation, depletion, amortization and asset retirement liability accretion expense		6,700
Correction of Immaterial Errors After Tax [Member]
Income Statement [Abstract]
Assets held for sale, loss (gain) on write-down		13,700
Depreciation, depletion, amortization and asset retirement liability accretion expense		5,200
Overstatement of Net Income After Tax [Member]
Income Statement [Abstract]
Net income (loss)			$ 18,900
Understatement of Net Income After Tax [Member]
Income Statement [Abstract]
Net income (loss)		$ 18,900

[1] (1) Refer to Note 1 - Summary of Significant Accounting Policies for a reconciliation of cash, cash equivalents, and restricted cash reported to the amounts reported within the accompanying unaudited condensed consolidated balance sheets (“accompanying balance sheets”).

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Summary of Significant Accounting Policies Reconciliation (Details) - USD ($) $ in Thousands		Jan. 01, 2018	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Cash and Cash Equivalents [Abstract]
Cash and cash equivalents			$ 615,906	$ 313,943
Restricted cash			0	0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations	[1]		$ 615,906	$ 313,943	$ 559,521	$ 12,372
Accounting Standards Update 2018-02 [Member]
Prior Period Adjustments Restatement [Line Items]
Cumulative effect of accounting change		$ 3,000

[1] (1) Refer to Note 1 - Summary of Significant Accounting Policies for a reconciliation of cash, cash equivalents, and restricted cash reported to the amounts reported within the accompanying unaudited condensed consolidated balance sheets (“accompanying balance sheets”).

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Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
Oil production revenue	$ 266,150	$ 128,874	$ 527,210	$ 296,498
Gas production revenue	84,064	101,740	163,173	202,921
NGL production revenue	52,344	54,325	95,061	118,718
Total oil, gas, and NGL production revenue	402,558	284,939	785,444	618,137
Revenue, Remaining Performance Obligation	0		0
Permian
Segment Reporting Information [Line Items]
Oil production revenue	227,636	78,554	433,430	160,053
Gas production revenue	31,734	12,937	56,611	24,246
NGL production revenue	129	107	253	254
Total oil, gas, and NGL production revenue	259,499	91,598	490,294	184,553
South Texas & Gulf Coast
Segment Reporting Information [Line Items]
Oil production revenue	19,346	13,072	38,929	51,936
Gas production revenue	52,235	87,760	104,968	175,961
NGL production revenue	52,248	53,558	94,018	116,915
Total oil, gas, and NGL production revenue	123,829	154,390	237,915	344,812
Rocky Mountain
Segment Reporting Information [Line Items]
Oil production revenue	19,168	37,248	54,851	84,509
Gas production revenue	95	1,043	1,594	2,714
NGL production revenue	(33)	660	790	1,549
Total oil, gas, and NGL production revenue	$ 19,230	$ 38,951	$ 57,235	$ 88,772
Sales Revenue, Net | Geographic Concentration Risk
Segment Reporting Information [Line Items]
Relative percentage	100.00%	100.00%	100.00%	100.00%
Sales Revenue, Net | Geographic Concentration Risk | Permian
Segment Reporting Information [Line Items]
Relative percentage	64.00%	32.00%	63.00%	30.00%
Sales Revenue, Net | Geographic Concentration Risk | South Texas & Gulf Coast
Segment Reporting Information [Line Items]
Relative percentage	31.00%	54.00%	30.00%	56.00%
Sales Revenue, Net | Geographic Concentration Risk | Rocky Mountain
Segment Reporting Information [Line Items]
Relative percentage	5.00%	14.00%	7.00%	14.00%

XML

Revenue from Contracts with Customers Accounts Receivable from Customers (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable	$ 178,682	$ 160,154
Accrued Income Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable	$ 115,000	$ 96,600

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Divestitures, Assets Held for Sale, and Acquisitions Divestitures and Assets Held for Sale (Details) $ in Thousands				3 Months Ended			6 Months Ended		12 Months Ended
		Mar. 26, 2018 USD ($) a	Mar. 10, 2017 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Non-cash (gain) loss on extinguishment of debt, net							$ 0	$ 22
Net divestiture proceeds							742,215	766,247
Net gain on divestiture activity				$ 39,501	$ (167,133)		424,870	(129,670)
Oil and gas properties held for sale, net				5,040			5,040		$ 111,700
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | PRB Divestiture 2018 [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net acreage divested | a		112,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Divide County Divestiture 2018 [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss before income taxes	[1]			(17,478)	(153,442)		(28,975)	(486,161)
Disposal Group, Held-for-sale, Not Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Oil and gas properties held for sale, net				5,000			5,000
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Divide County Disposal Group [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Assets held for sale, loss (gain) on write-down					166,900	$ 359,600		526,500
Net Divestiture Proceeds Received at Closing [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | PRB Divestiture 2018 [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net divestiture proceeds		$ 490,800
Net Divestiture Proceeds Received at Closing [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Divide County Divestiture and Halff East Divestiture 2018 [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net divestiture proceeds				$ 250,800
Net Divestiture Proceeds Received at Closing [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Non-Operated Eagle Ford Divestiture 2017 [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net divestiture proceeds			$ 747,400
Estimated Net Gain [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | PRB Divestiture 2018 [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net gain on divestiture activity							410,100
Estimated Net Gain [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Divide County Divestiture and Halff East Divestiture 2018 [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net gain on divestiture activity							$ 15,700
Estimated Net Gain [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Non-Operated Eagle Ford Divestiture 2017 [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net gain on divestiture activity								$ 397,400
Net Divestiture Proceeds After Final Purchase Price Adjustments [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Non-Operated Eagle Ford Divestiture 2017 [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net divestiture proceeds									744,100
Net Divestiture Proceeds After Final Purchase Price Adjustments [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Other Divestitures 2017 [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net divestiture proceeds					$ 24,600
Final Net Gain [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Non-Operated Eagle Ford Divestiture 2017 [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net gain on divestiture activity									$ 396,800

[1] (1) Loss before income taxes reflects oil, gas, and NGL production revenue, less oil, gas, and NGL production expense, depletion, depreciation, amortization, and asset retirement obligation liability accretion expense, impairment expense, and net loss on divestiture activity.

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Divestitures, Assets Held for Sale, and Acquisitions Acquisitions (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2018 USD ($) a	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($) a
Business Acquisition [Line Items]
Payments to Acquire Oil and Gas Property and Equipment		$ 24,615	$ 88,140
Noncash or Part Noncash Acquisition, Net Nonmonetary Assets Acquired (Liabilities Assumed)		$ 0
Other Howard and Martin Counties Trades [Member]
Business Acquisition [Line Items]
Non-monetary Trade, Acreage Acquired | a			6,550
Non-monetary Trade, Acreage Exchanged | a			5,700
Noncash or Part Noncash Acquisition, Net Nonmonetary Assets Acquired (Liabilities Assumed)			$ 279,750
Gain or loss recognized on trade			0
Other Martin County Acquisition 2018 [Member]
Business Acquisition [Line Items]
Payments to Acquire Oil and Gas Property and Equipment	$ 24,600
Net Acres Acquired | a	720
Other Howard and Martin Counties Acquisitions 2017 [Member]
Business Acquisition [Line Items]
Payments to Acquire Oil and Gas Property and Equipment			$ 72,300
Net Acres Acquired | a			3,400

XML

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Components of the provision for income taxes
Federal	$ 0	$ 4,607	$ 0	$ (2,832)
State	40	2,439	(585)	(1,403)
Deferred portion of income tax (expense) benefit	861	64,015	(97,505)	30,790
Income tax (expense) benefit	$ 901	$ 71,061	$ (98,090)	$ 26,555
Effective tax rate	(5.50%)	37.20%	22.70%	36.90%
Tax Year 2017 [Member]
Federal enacted statutory income tax rate, percent			35.00%
Future tax years [Member]
Federal enacted statutory income tax rate, percent			21.00%

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Long-Term Debt Revolving Credit Facility (Details) - USD ($) $ in Thousands		Jul. 25, 2018	Jun. 30, 2018	Apr. 24, 2018	Dec. 31, 2017
Line of Credit Facility [Line Items]
Credit facility balance			$ 0		$ 0
Line of Credit [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of credit agreement, maximum loan amount			2,500,000
Line of credit facility, current borrowing base			1,300,000	$ 1,400,000
Line of credit agreement, aggregate lender commitments			1,000,000	$ 1,000,000	925,000
Credit facility balance	[1]		0		0
Letters of credit	[2]		200		200
Available borrowing capacity			999,800		924,800
Unamortized deferred financing costs			$ 2,400		$ 3,100
Subsequent Event [Member] | Line of Credit [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of credit agreement, aggregate lender commitments		$ 1,000,000
Credit facility balance		0
Letters of credit	[2]	200
Available borrowing capacity		$ 999,800

[1] (1) Unamortized deferred financing costs attributable to the credit facility are presented as a component of other noncurrent assets on the accompanying balance sheets and totaled $2.4 million and $3.1 million as of June 30, 2018, and December 31, 2017, respectively.

[2] (2) Letters of credit outstanding reduce the amount available under the credit facility on a dollar-for-dollar basis.

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Long-Term Debt Senior Notes (Details) - USD ($) $ in Thousands			3 Months Ended			6 Months Ended
	Jul. 16, 2018	Jun. 15, 2018	Sep. 30, 2018	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Debt Instrument [Line Items]
Loss on extinguishment of debt				$ 0	$ 0	$ 0	$ (35)
Non-cash loss on extinguishment of debt						0	22
Cash paid for extinguishment of debt						0	$ 13
Current portion of Senior Notes, net of unamortized deferred financing costs (note 5)				342,301		342,301		$ 0
Senior Notes, net of unamortized deferred financing costs				$ 2,429,994		$ 2,429,994		2,769,663
6.50% Senior Notes due 2021
Debt Instrument [Line Items]
Senior Notes, interest rate, stated percentage				6.50%		6.50%
Unamortized Deferred Financing Costs				$ (2,310)		$ (2,310)		(2,656)
6.125% Senior Notes due 2022
Debt Instrument [Line Items]
Senior Notes, interest rate, stated percentage				6.125%		6.125%
Unamortized Deferred Financing Costs				$ (5,211)		$ (5,211)		(5,800)
6.50% Senior Notes due 2023
Debt Instrument [Line Items]
Senior Notes, interest rate, stated percentage				6.50%		6.50%
Unamortized Deferred Financing Costs				$ (3,342)		$ (3,342)		(3,707)
5.0% Senior Notes due 2024
Debt Instrument [Line Items]
Senior Notes, interest rate, stated percentage				5.00%		5.00%
Unamortized Deferred Financing Costs				$ (5,149)		$ (5,149)		(5,610)
5.625% Senior Notes due 2025
Debt Instrument [Line Items]
Senior Notes, interest rate, stated percentage				5.625%		5.625%
Unamortized Deferred Financing Costs				$ (6,261)		$ (6,261)		(6,714)
6.75% Senior Notes due 2026
Debt Instrument [Line Items]
Senior Notes, interest rate, stated percentage				6.75%		6.75%
Unamortized Deferred Financing Costs				$ (6,824)		$ (6,824)		(7,242)
Senior Notes [Member]
Debt Instrument [Line Items]
Principal Amount				2,801,392		2,801,392		2,801,392
Unamortized Deferred Financing Costs				(29,097)		(29,097)		(31,729)
Senior Notes, net of unamortized deferred financing costs				$ 2,772,295		$ 2,772,295		2,769,663
Senior Notes [Member] | 6.50% Senior Notes due 2021
Debt Instrument [Line Items]
Senior Notes, interest rate, stated percentage				6.50%		6.50%
Debt Instrument, Redemption Price, Percentage		102.167%
Principal Amount				$ 344,611		$ 344,611		344,611
Current portion of Senior Notes, net of unamortized deferred financing costs (note 5)				$ 342,301		$ 342,301
Senior Notes, net of unamortized deferred financing costs								341,955
Senior Notes [Member] | 6.125% Senior Notes due 2022
Debt Instrument [Line Items]
Senior Notes, interest rate, stated percentage				6.125%		6.125%
Principal Amount				$ 561,796		$ 561,796		561,796
Senior Notes, net of unamortized deferred financing costs				$ 556,585		$ 556,585		555,996
Senior Notes [Member] | 6.50% Senior Notes due 2023
Debt Instrument [Line Items]
Senior Notes, interest rate, stated percentage				6.50%		6.50%
Principal Amount				$ 394,985		$ 394,985		394,985
Senior Notes, net of unamortized deferred financing costs				$ 391,643		$ 391,643		391,278
Senior Notes [Member] | 5.0% Senior Notes due 2024
Debt Instrument [Line Items]
Senior Notes, interest rate, stated percentage				5.00%		5.00%
Principal Amount				$ 500,000		$ 500,000		500,000
Senior Notes, net of unamortized deferred financing costs				$ 494,851		$ 494,851		494,390
Senior Notes [Member] | 5.625% Senior Notes due 2025
Debt Instrument [Line Items]
Senior Notes, interest rate, stated percentage				5.625%		5.625%
Principal Amount				$ 500,000		$ 500,000		500,000
Senior Notes, net of unamortized deferred financing costs				$ 493,739		$ 493,739		493,286
Senior Notes [Member] | 6.75% Senior Notes due 2026
Debt Instrument [Line Items]
Senior Notes, interest rate, stated percentage				6.75%		6.75%
Principal Amount				$ 500,000		$ 500,000		500,000
Senior Notes, net of unamortized deferred financing costs				$ 493,176		$ 493,176		$ 492,758
Subsequent Event [Member] | Senior Notes [Member] | 6.50% Senior Notes due 2021
Debt Instrument [Line Items]
Debt Instrument, Repurchased Settlement Amount	$ 355,900
Loss on extinguishment of debt			$ 9,800
Non-cash loss on extinguishment of debt			2,300
Cash paid for extinguishment of debt			$ 7,500

XML

Long-Term Debt Senior Convertible Notes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Debt Instrument [Line Items]
Senior Convertible Notes, net carrying amount	$ 143,430		$ 143,430		$ 139,107
1.50% Senior Convertible Notes Due 2021 [Member]
Debt Instrument [Line Items]
Senior Convertible Notes, face amount	$ 172,500		$ 172,500		172,500
Senior Convertible Notes, interest rate, stated percentage	1.50%		1.50%
Senior Convertible Notes, interest expense	$ 2,600	$ 2,500	$ 5,200	$ 4,900
Senior Convertible Notes, unamortized debt discount	(26,319)		(26,319)		(30,183)
Unamortized deferred financing costs	(2,751)		(2,751)		(3,210)
Senior Convertible Notes, net carrying amount	$ 143,430		$ 143,430		$ 139,107

XML

Commitments (Details) MMcf in Thousands, $ in Millions	Jun. 30, 2018 USD ($) MMcf MMBbls	Aug. 02, 2018 USD ($)
Water Pipeline Commitment [Member]
Other Commitments [Line Items]
Water delivery commitments, remaining minimum contractual volumes | MMBbls	22
Water Purchase Commitment [Member]
Other Commitments [Line Items]
Water purchase commitment, minimum volume required | MMBbls	7
Gas gathering and Oil and Gas Through-put Commitments [Member]
Other Commitments [Line Items]
Contractual obligation	$ 360.6
Drilling Rig Leasing Contracts [Member] | Subsequent Event [Member]
Other Commitments [Line Items]
Contractual obligation		$ 103.1
Early termination penalties for rig contracts		$ 40.4
Electricity Purchase Agreement [Member]
Other Commitments [Line Items]
Contractual obligation	$ 30.8
Crude Oil Pipeline Commitment [Member]
Other Commitments [Line Items]
Oil and gas delivery commitments, remaining minimum contractual volumes | MMBbls	31
Natural Gas Pipeline Commitment [Member]
Other Commitments [Line Items]
Oil and gas delivery commitments, remaining minimum contractual volumes | MMcf	737

XML

Compensation Plans (Details)	1 Months Ended		3 Months Ended		6 Months Ended
	Aug. 02, 2018 USD ($) shares	Jul. 25, 2018 USD ($) shares	Jun. 30, 2018 USD ($) shares	Jun. 30, 2017 USD ($) shares	Jun. 30, 2018 USD ($) shares	Jun. 30, 2017 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant			6,800,000		6,800,000
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense | $			$ 2,400,000	$ 1,700,000	$ 4,800,000	$ 4,200,000
Unrecognized stock based compensation expense | $			12,400,000		12,400,000
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense | $			2,300,000	$ 2,100,000	5,000,000	$ 4,600,000
Unrecognized stock based compensation expense | $			$ 12,800,000		$ 12,800,000
Number of shares represented by each RSU					1
Subsequent Event [Member] | Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Multiplier applied to PSU awards at settlement	0
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	572,924
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Granted in Period, Total Fair Value | $	$ 14,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period	0
Subsequent Event [Member] | Performance Shares [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Multiplier applied to PSU awards at settlement	0
Subsequent Event [Member] | Performance Shares [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Multiplier applied to PSU awards at settlement	2
Subsequent Event [Member] | Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		534,770
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Granted in Period, Total Fair Value | $		$ 13,700,000
Stock Issued During Period, Shares, Share-based Compensation, Gross		406,013
Restricted Stock, Shares Issued Net of Shares for Tax Withholdings		290,584
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Rate			15.00%		15.00%
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription | $			$ 25,000		$ 25,000
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent					85.00%
Stock Issued During Period, Shares, Employee Stock Purchase Plans					100,249	123,678
Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Excluding Stock Options | $					$ 1,900,000	$ 1,700,000
Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Issued During Period, Shares, Share-based Compensation, Gross			58,572	71,573
Director [Member] | Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period				8,794

XML

Pension Benefits (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Components of Net Periodic Benefit Costs for the Pension Plans
Service cost	$ 1,705	$ 1,269	$ 3,365	$ 3,319
Interest cost	637	617	1,310	1,344
Expected return on plan assets that reduces periodic pension benefit cost	(370)	(563)	(931)	(1,122)
Amortization of prior service cost	5	5	9	9
Amortization of net actuarial loss	340	253	664	649
Net periodic benefit cost	$ 2,317	$ 1,581	$ 4,417	$ 4,199

XML

Pension Benefits Pension (Details) $ in Millions	6 Months Ended
	Jun. 30, 2018 USD ($)
Pension Details [Abstract]
Pension Plans, Gain (Loss) Amortization Threshold	10.00%
Pension Contributions	$ 6.1

XML

Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0	44	0	59
Calculation of basic and diluted earnings per share
Net income (loss)	$ 17,197	$ (119,907)	$ 334,598	$ (45,473)
Basic weighted-average common shares outstanding	111,701	111,277	111,698	111,274
Dilutive effect of non-vested RSUs and contingent PSUs	1,929	0	1,569	0
Dilutive effect of Senior Convertible Notes	0	0	0	0
Diluted weighted-average common shares outstanding	113,630	111,277	113,267	111,274
Basic net income (loss) per common share	$ 0.15	$ (1.08)	$ 3.00	$ (0.41)
Diluted net income (loss) per common share	0.15	$ (1.08)	2.95	$ (0.41)
1.50% Senior Convertible Notes Due 2021 [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Debt Instrument, Convertible, Conversion Price	$ 40.50		$ 40.50

XML

Derivative Financial Instruments (Details) bbl in Thousands, BTU in Billions		Aug. 02, 2018 $ / Barrels bbl	Jun. 30, 2018 BTU $ / Barrels $ / EnergyContent bbl
NYMEX Oil Swap Contract Third Quarter 2018 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl			1,769
Derivative, Swap Type, Average Fixed Price			49.77
NYMEX Oil Swap Contract Fourth Quarter 2018 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl			1,894
Derivative, Swap Type, Average Fixed Price			49.87
NYMEX Oil Swap Contract 2019 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl			1,940
Derivative, Swap Type, Average Fixed Price			50.70
NYMEX Oil Swap Contracts [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl			5,603
NYMEX Oil Collar Contract Third Quarter 2018 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl			1,948
Derivative, Floor Price			50.00
Derivative, Ceiling Price			58.61
NYMEX Oil Collar Contract Fourth Quarter 2018 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl			2,222
Derivative, Floor Price			50.00
Derivative, Ceiling Price			58.44
NYMEX Oil Collar Contract 2019 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl			10,055
Derivative, Floor Price			50.59
Derivative, Ceiling Price			63.62
NYMEX Oil Collar Contract 2020 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl			366
Derivative, Floor Price			55.00
Derivative, Ceiling Price			67.01
NYMEX Oil Collar Contracts [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl			14,591
Gas Swaps Contract Third Quarter 2018 [Member]
Derivative Financial Instruments
Derivative, Swap Type, Average Fixed Price | $ / EnergyContent			3.25
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU			28,218
Derivative, Nonmonetary Notional Amount, Energy Measure, Purchased Volumes | BTU			(7,480)
Derivative, Swap Type, Weighted-Average Fixed Price, Purchased Volumes | $ / EnergyContent			4.23
Derivative, Nonmonetary Notional Amount, Energy Measure, Net Volumes | BTU			20,738
Derivative, Swap Type, Average Fixed Price, Net of Purchased Volumes | $ / EnergyContent			2.90
Gas Swaps Contract Fourth Quarter 2018 [Member]
Derivative Financial Instruments
Derivative, Swap Type, Average Fixed Price | $ / EnergyContent			3.27
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU			28,204
Derivative, Nonmonetary Notional Amount, Energy Measure, Purchased Volumes | BTU			(7,210)
Derivative, Swap Type, Weighted-Average Fixed Price, Purchased Volumes | $ / EnergyContent			4.27
Derivative, Nonmonetary Notional Amount, Energy Measure, Net Volumes | BTU			20,994
Derivative, Swap Type, Average Fixed Price, Net of Purchased Volumes | $ / EnergyContent			2.92
Gas Swaps Contract 2019 [Member]
Derivative Financial Instruments
Derivative, Swap Type, Average Fixed Price | $ / EnergyContent			3.87
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU			41,394
Derivative, Nonmonetary Notional Amount, Energy Measure, Purchased Volumes | BTU			(24,415)
Derivative, Swap Type, Weighted-Average Fixed Price, Purchased Volumes | $ / EnergyContent			4.34
Derivative, Nonmonetary Notional Amount, Energy Measure, Net Volumes | BTU			16,979
Derivative, Swap Type, Average Fixed Price, Net of Purchased Volumes | $ / EnergyContent			2.92
Gas Swaps Contracts [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU			97,816
Derivative, Nonmonetary Notional Amount, Energy Measure, Purchased Volumes | BTU			(39,105)
Derivative, Nonmonetary Notional Amount, Energy Measure, Net Volumes | BTU			58,711
IF HSC Gas Collar Contract 2019 [Member]
Derivative Financial Instruments
Derivative, Floor Price | $ / EnergyContent			2.50
Derivative, Ceiling Price | $ / EnergyContent			2.83
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU			14,242
Gas Collar Contracts [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU			14,242
WTI Midland NYMEX WTI [Member] | Oil Basis Swap Contract Third Quarter 2018 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl			3,018
Weighted-Average Contract Price	[1]		(1.06)
WTI Midland NYMEX WTI [Member] | Oil Basis Swap Contract Fourth Quarter 2018 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl			3,327
Weighted-Average Contract Price	[1]		(1.08)
WTI Midland NYMEX WTI [Member] | Oil Basis Swap Contract 2019 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl			11,217
Weighted-Average Contract Price	[1]		(3.36)
WTI Midland NYMEX WTI [Member] | Oil Basis Swap Contract 2020 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl			7,250
Weighted-Average Contract Price	[1]		(1.13)
WTI Midland NYMEX WTI [Member] | Oil Basis Swap Contract 2021 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl			0
Weighted-Average Contract Price	[1]		0.00
WTI Midland NYMEX WTI [Member] | Oil Basis Swap Contract 2022 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl			0
Weighted-Average Contract Price	[1]		0.00
WTI Midland NYMEX WTI [Member] | Oil Basis Swap [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl			24,812
NYMEX WTI ICE Brent [Member] | Oil Basis Swap Contract Third Quarter 2018 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl			0
Weighted-Average Contract Price	[2]		0.00
NYMEX WTI ICE Brent [Member] | Oil Basis Swap Contract Fourth Quarter 2018 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl			0
Weighted-Average Contract Price	[2]		0.00
NYMEX WTI ICE Brent [Member] | Oil Basis Swap Contract 2019 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl			0
Weighted-Average Contract Price	[2]		0.00
NYMEX WTI ICE Brent [Member] | Oil Basis Swap Contract 2020 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl			1,288
Weighted-Average Contract Price	[2]		(7.97)
NYMEX WTI ICE Brent [Member] | Oil Basis Swap Contract 2021 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl			1,460
Weighted-Average Contract Price	[2]		(7.80)
NYMEX WTI ICE Brent [Member] | Oil Basis Swap Contract 2022 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl			274
Weighted-Average Contract Price	[2]		(7.67)
NYMEX WTI ICE Brent [Member] | Oil Basis Swap [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl			3,022
OPIS Ethane Purity Mont Belvieu [Member] | NGL Swaps Contract Third Quarter 2018 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl			1,033
Derivative, Swap Type, Average Fixed Price			10.99
OPIS Ethane Purity Mont Belvieu [Member] | NGL Swaps Contract Fourth Quarter 2018 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl			1,146
Derivative, Swap Type, Average Fixed Price			11.18
OPIS Ethane Purity Mont Belvieu [Member] | NGL Swaps Contract 2019 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl			3,533
Derivative, Swap Type, Average Fixed Price			12.31
OPIS Ethane Purity Mont Belvieu [Member] | NGL Swaps Contract 2020 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl			539
Derivative, Swap Type, Average Fixed Price			11.13
OPIS Ethane Purity Mont Belvieu [Member] | NGL Swaps Contracts [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl			6,251
OPIS Propane Mont Belvieu Non-TET [Member] | NGL Swaps Contract Third Quarter 2018 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl			610
Derivative, Swap Type, Average Fixed Price			24.27
OPIS Propane Mont Belvieu Non-TET [Member] | NGL Swaps Contract Fourth Quarter 2018 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl			671
Derivative, Swap Type, Average Fixed Price			24.39
OPIS Propane Mont Belvieu Non-TET [Member] | NGL Swaps Contract 2019 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl			1,503
Derivative, Swap Type, Average Fixed Price			27.83
OPIS Propane Mont Belvieu Non-TET [Member] | NGL Swaps Contract 2020 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl			0
Derivative, Swap Type, Average Fixed Price			0.00
OPIS Propane Mont Belvieu Non-TET [Member] | NGL Swaps Contracts [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl			2,784
OPIS Normal Butane Mont Belvieu Non-TET [Member] | NGL Swaps Contract Third Quarter 2018 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl			93
Derivative, Swap Type, Average Fixed Price			35.70
OPIS Normal Butane Mont Belvieu Non-TET [Member] | NGL Swaps Contract Fourth Quarter 2018 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl			102
Derivative, Swap Type, Average Fixed Price			35.70
OPIS Normal Butane Mont Belvieu Non-TET [Member] | NGL Swaps Contract 2019 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl			154
Derivative, Swap Type, Average Fixed Price			35.64
OPIS Normal Butane Mont Belvieu Non-TET [Member] | NGL Swaps Contract 2020 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl			0
Derivative, Swap Type, Average Fixed Price			0.00
OPIS Normal Butane Mont Belvieu Non-TET [Member] | NGL Swaps Contracts [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl			349
OPIS Isobutane Mont Belvieu Non-TET [Member] | NGL Swaps Contract Third Quarter 2018 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl			70
Derivative, Swap Type, Average Fixed Price			35.07
OPIS Isobutane Mont Belvieu Non-TET [Member] | NGL Swaps Contract Fourth Quarter 2018 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl			76
Derivative, Swap Type, Average Fixed Price			35.07
OPIS Isobutane Mont Belvieu Non-TET [Member] | NGL Swaps Contract 2019 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl			117
Derivative, Swap Type, Average Fixed Price			35.70
OPIS Isobutane Mont Belvieu Non-TET [Member] | NGL Swaps Contract 2020 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl			0
Derivative, Swap Type, Average Fixed Price			0.00
OPIS Isobutane Mont Belvieu Non-TET [Member] | NGL Swaps Contracts [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl			263
OPIS Natural Gasoline Mont Belvieu Non-TET [Member] | NGL Swaps Contract Third Quarter 2018 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl			202
Derivative, Swap Type, Average Fixed Price			51.13
OPIS Natural Gasoline Mont Belvieu Non-TET [Member] | NGL Swaps Contract Fourth Quarter 2018 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl			208
Derivative, Swap Type, Average Fixed Price			50.99
OPIS Natural Gasoline Mont Belvieu Non-TET [Member] | NGL Swaps Contract 2019 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl			197
Derivative, Swap Type, Average Fixed Price			50.93
OPIS Natural Gasoline Mont Belvieu Non-TET [Member] | NGL Swaps Contract 2020 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl			0
Derivative, Swap Type, Average Fixed Price			0.00
OPIS Natural Gasoline Mont Belvieu Non-TET [Member] | NGL Swaps Contracts [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl			607
Subsequent Event [Member] | NYMEX Oil Collar Contract 2020 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl		800
Derivative, Floor Price		55.00
Subsequent Event [Member] | NYMEX WTI ICE Brent [Member] | Oil Basis Swap Contract 2020 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl		600
Subsequent Event [Member] | NYMEX WTI ICE Brent [Member] | Oil Basis Swap Contract 2021 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl		1,800
Subsequent Event [Member] | NYMEX WTI ICE Brent [Member] | Oil Basis Swap Contract 2022 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl		2,600
Subsequent Event [Member] | OPIS Propane Mont Belvieu Non-TET [Member] | NGL Swaps Contract 2019 [Member]
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl		500
Minimum [Member] | Subsequent Event [Member] | NYMEX Oil Collar Contract 2020 [Member]
Derivative Financial Instruments
Derivative, Ceiling Price		64.50
Minimum [Member] | Subsequent Event [Member] | NYMEX WTI ICE Brent [Member] | Oil Basis Swap Contract 2020 [Member]
Derivative Financial Instruments
Weighted-Average Contract Price		(8.06)
Minimum [Member] | Subsequent Event [Member] | NYMEX WTI ICE Brent [Member] | Oil Basis Swap Contract 2021 [Member]
Derivative Financial Instruments
Weighted-Average Contract Price		(7.75)
Minimum [Member] | Subsequent Event [Member] | NYMEX WTI ICE Brent [Member] | Oil Basis Swap Contract 2022 [Member]
Derivative Financial Instruments
Weighted-Average Contract Price		(7.60)
Minimum [Member] | Subsequent Event [Member] | OPIS Propane Mont Belvieu Non-TET [Member] | NGL Swaps Contract 2019 [Member]
Derivative Financial Instruments
Derivative, Swap Type, Average Fixed Price		32.21
Maximum [Member] | Subsequent Event [Member] | NYMEX Oil Collar Contract 2020 [Member]
Derivative Financial Instruments
Derivative, Ceiling Price		67.67
Maximum [Member] | Subsequent Event [Member] | NYMEX WTI ICE Brent [Member] | Oil Basis Swap Contract 2020 [Member]
Derivative Financial Instruments
Weighted-Average Contract Price		(8.15)
Maximum [Member] | Subsequent Event [Member] | NYMEX WTI ICE Brent [Member] | Oil Basis Swap Contract 2021 [Member]
Derivative Financial Instruments
Weighted-Average Contract Price		(8.00)
Maximum [Member] | Subsequent Event [Member] | NYMEX WTI ICE Brent [Member] | Oil Basis Swap Contract 2022 [Member]
Derivative Financial Instruments
Weighted-Average Contract Price		(7.90)
Maximum [Member] | Subsequent Event [Member] | OPIS Propane Mont Belvieu Non-TET [Member] | NGL Swaps Contract 2019 [Member]
Derivative Financial Instruments
Derivative, Swap Type, Average Fixed Price		32.26

[1] (1) Represents the price differential between WTI Midland (Midland, Texas) and NYMEX WTI (Cushing, Oklahoma).

[2] (2) Represents the price differential between NYMEX WTI (Cushing, Oklahoma) and ICE Brent (North Sea).

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Derivative Financial Instruments Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2018		Dec. 31, 2017
Fair value of derivative assets and liabilities
Derivative, fair value, net	$ (149,400)		$ (139,400)
Derivative assets, current	146,329		64,266
Derivative assets, noncurrent	31,151		40,362
Total derivative assets	177,480		104,628
Derivative liabilities, current	259,338		172,582
Derivatives liabilities, noncurrent	67,583		71,402
Total derivative liabilities	326,921		243,984
Derivative asset, not offset in the accompanying balance sheets	(147,009)		(100,035)
Derivative liabilities, not offset in the accompanying balance sheets	147,009		100,035
Derivative asset, fair value, net amounts	30,471		4,593
Derivative liabilities, fair value, net amounts	(179,912)		(143,949)
Not Designated as Hedging Instrument [Member]
Fair value of derivative assets and liabilities
Derivative assets, current	146,329		64,266
Derivative assets, noncurrent	31,151		40,362
Derivative liabilities, current	259,338		172,582
Derivatives liabilities, noncurrent	67,583		71,402
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Not Designated as Hedging Instrument [Member]
Fair value of derivative assets and liabilities
Total derivative assets	177,480	[1]	104,628	[2]
Total derivative liabilities	$ 326,921	[1]	$ 243,984	[2]

[1] (1) This represents a financial asset or liability that is measured at fair value on a recurring basis.

[2] (1) This represents a financial asset or liability that is measured at fair value on a recurring basis.

XML

Derivative Financial Instruments Gains and Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Derivative settlement (gain) loss	$ 36,665	$ (16,303)	$ 61,193	$ (16,310)
Net derivative (gain) loss	63,749	(55,189)	71,278	(169,963)
Oil Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative settlement (gain) loss	24,430	2,754	45,178	11,838
Net derivative (gain) loss	22,402	(38,194)	36,368	(87,784)
Gas Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative settlement (gain) loss	757	(21,751)	(5,653)	(39,257)
Net derivative (gain) loss	7,000	(6,038)	16,990	(50,506)
NGL Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative settlement (gain) loss	11,478	2,694	21,668	11,109
Net derivative (gain) loss	$ 34,347	$ (10,957)	$ 17,920	$ (31,673)

XML

Derivative Financial Instruments Credit Facility and Derivative Counterparties (Details)	Jun. 30, 2018
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Percentage of Proved Property Secured for Credit Facility Borrowing	90.00%

XML

Fair Value Measurements Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2018		Dec. 31, 2017
Assets
Derivatives	$ 177,480		$ 104,628
Liabilities
Derivatives	326,921		243,984
Not Designated as Hedging Instrument [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Assets
Derivatives	0	[1]	0	[2]
Liabilities
Derivatives	0	[1]	0	[2]
Not Designated as Hedging Instrument [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Assets
Derivatives	177,480	[1]	104,628	[2]
Liabilities
Derivatives	326,921	[1]	243,984	[2]
Not Designated as Hedging Instrument [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Assets
Derivatives	0	[1]	0	[2]
Liabilities
Derivatives	$ 0	[1]	$ 0	[2]

[1] (1) This represents a financial asset or liability that is measured at fair value on a recurring basis.

[2] (1) This represents a financial asset or liability that is measured at fair value on a recurring basis.

XML

Fair Value Measurements Proved and Unproved Oil and Gas Properties and Other Property and Equipment (Details) - USD ($) $ in Thousands		3 Months Ended			6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of Proved Oil and Gas Properties		$ 0	$ 0		$ 0	$ 0
Abandonment and impairment of unproved oil and gas properties		11,935	157		17,560	157
Oil and gas properties held for sale, net	$ 5,040	5,040			5,040		$ 111,700
Disposal Group, Held-for-sale, Not Discontinued Operations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Oil and gas properties held for sale, net	$ 5,000	$ 5,000			$ 5,000
Divide County Disposal Group [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down			$ 166,900	$ 359,600		$ 526,500
Oil and Gas Properties [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Period of New York Mercantile Exchange Strip Pricing Used for Price Forecast	5 years
Oil and Gas Properties [Member] | Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Inputs, Discount Rate	10.00%
Oil and Gas Properties [Member] | Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Inputs, Discount Rate	15.00%

XML

Fair Value Measurements Long-term Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
6.50% Senior Notes due 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior Notes, interest rate, stated percentage	6.50%
6.125% Senior Notes due 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior Notes, interest rate, stated percentage	6.125%
6.50% Senior Notes due 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior Notes, interest rate, stated percentage	6.50%
5.0% Senior Notes due 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior Notes, interest rate, stated percentage	5.00%
5.625% Senior Notes due 2025
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior Notes, interest rate, stated percentage	5.625%
6.75% Senior Notes due 2026
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior Notes, interest rate, stated percentage	6.75%
Senior Notes [Member] | 6.50% Senior Notes due 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior Notes, interest rate, stated percentage	6.50%
Principal Amount	$ 344,611	$ 344,611
Long-term Debt, Fair Value	$ 352,634	351,682
Senior Notes [Member] | 6.125% Senior Notes due 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior Notes, interest rate, stated percentage	6.125%
Principal Amount	$ 561,796	561,796
Long-term Debt, Fair Value	$ 573,847	571,627
Senior Notes [Member] | 6.50% Senior Notes due 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior Notes, interest rate, stated percentage	6.50%
Principal Amount	$ 394,985	394,985
Long-term Debt, Fair Value	$ 401,380	403,434
Senior Notes [Member] | 5.0% Senior Notes due 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior Notes, interest rate, stated percentage	5.00%
Principal Amount	$ 500,000	500,000
Long-term Debt, Fair Value	$ 468,750	483,440
Senior Notes [Member] | 5.625% Senior Notes due 2025
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior Notes, interest rate, stated percentage	5.625%
Principal Amount	$ 500,000	500,000
Long-term Debt, Fair Value	$ 485,000	494,355
Senior Notes [Member] | 6.75% Senior Notes due 2026
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior Notes, interest rate, stated percentage	6.75%
Principal Amount	$ 500,000	500,000
Long-term Debt, Fair Value	$ 502,350	516,350
Convertible Debt [Member] | 1.50% Senior Convertible Notes Due 2021 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior Notes, interest rate, stated percentage	1.50%
Principal Amount	$ 172,500	172,500
Long-term Debt, Fair Value	$ 178,446	$ 168,291