Bill Barrett (BBG) 10-Q 5 May 16 2016 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2016	Apr. 22, 2016
Document Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2016
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q1
Trading Symbol	BBG
Entity Registrant Name	BILL BARRETT CORPORATION
Entity Central Index Key	1,172,139
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		50,315,695

CONSOLIDATED BALANCE SHEETS (UN

CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 105,563	$ 128,836
Accounts receivable, net of allowance for doubtful accounts	31,048	43,461
Derivative assets	80,374	99,809
Assets held for sale, net of amortization and impairment	33,717	0
Prepayments and other current assets	2,661	2,211
Total current assets	253,363	274,317
Property and equipment - at cost, successful efforts method for oil and gas properties:
Proved oil and gas properties	1,426,985	2,000,210
Unproved oil and gas properties, excluded from amortization	121,454	79,198
Furniture, equipment and other	26,698	26,021
Property, plant and equipment, gross	1,575,137	2,105,429
Accumulated depreciation, depletion, amortization and impairment	(433,508)	(934,745)
Total property and equipment, net	1,141,629	1,170,684
Deferred income taxes	30,849	38,219
Derivative assets	14,803	19,662
Deferred financing costs and other noncurrent assets	3,566	3,638
Total	1,444,210	1,506,520
Current liabilities:
Accounts payable and accrued liabilities	59,171	64,337
Amounts payable to oil and gas property owners	11,621	15,657
Production taxes payable	22,714	26,578
Deferred income taxes	30,849	38,219
Current portion of long-term debt	443	440
Liabilities associated with assets held for sale	4,785	0
Total current liabilities	129,583	145,231
Long-term debt, net of debt issuance costs	794,972	794,652
Asset retirement obligations	10,103	14,066
Derivatives and other noncurrent liabilities	3,575	3,155
Stockholders' equity:
Common stock, $0.001 par value; authorized 150,000,000 shares; 50,326,243 and 49,864,512 shares issued and outstanding at March 31, 2016 and December 31, 2015, respectively, with 1,707,252 and 1,471,508 shares subject to restrictions, respectively	49	48
Additional paid-in capital	924,374	921,318
Retained earnings (Accumulated deficit)	(418,446)	(371,950)
Treasury stock, at cost: zero shares at March 31, 2016 and December 31, 2015, respectively	0	0
Total stockholders' equity	505,977	549,416
Total liabilities and stockholders' equity	$ 1,444,210	$ 1,506,520

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Mar. 31, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	150,000,000	150,000,000
Common stock, shares issued (in shares)	50,326,243	49,864,512
Common stock, shares outstanding (in shares)	50,326,243	49,864,512
Common stock, shares subject to restrictions (in shares)	1,707,252	1,471,508
Treasury stock, shares (in shares)	0	0

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Operating and Other Revenues:
Oil, gas and NGL production	$ 29,121	$ 48,486
Other	313	548
Total operating and other revenues	29,434	49,034
Operating Expenses:
Lease operating expense	8,827	13,791
Gathering, transportation and processing expense	788	942
Production tax expense	(315)	2,534
Exploration expense	27	33
Impairment, dry hole costs and abandonment expense	558	1,255
(Gain) Loss on divestitures	0	(38)
Depreciation, depletion and amortization	42,016	52,254
Unused commitments	4,568	4,388
General and administrative expense	12,420	13,329
Total operating expenses	68,889	88,488
Operating Income (Loss)	(39,455)	(39,454)
Other Income and Expense:
Interest and other income	37	275
Interest expense	(15,746)	(16,430)
Commodity derivative gain (loss)	8,668	34,438
Gain (Loss) on extinguishment of debt	0	2,567
Total other income and expense	(7,041)	20,850
Income (Loss) before Income Taxes	(46,496)	(18,604)
(Provision for) Benefit from Income Taxes	0	6,873
Net Income (Loss)	$ (46,496)	$ (11,731)
Net Income (Loss) Per Common Share, Basic (in dollars per share)	$ (0.96)	$ (0.24)
Net Income (Loss) Per Common Share, Diluted (in dollars per share)	$ (0.96)	$ (0.24)
Weighted Average Common Shares Outstanding, Basic (in shares)	48,499,296	48,198,948
Weighted Average Common Shares Outstanding, Diluted (in shares)	48,499,296	48,198,948

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Net Income (Loss)	$ (46,496)	$ (11,731)	$ (487,771)
Other Comprehensive Income (Loss), net of tax:
Other comprehensive income (loss)	0	0
Comprehensive Income (Loss)	$ (46,496)	$ (11,731)

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Operating Activities:
Net Income (Loss)	$ (46,496)	$ (11,731)
Adjustments to reconcile to net cash provided by operations:
Depreciation, depletion and amortization	42,016	52,254
Deferred income tax benefit	0	(6,873)
Impairment, dry hole costs and abandonment expense	558	1,255
Total commodity derivative (gain) loss	(8,668)	(34,438)
Gain (Loss) on settlements of commodity derivatives	32,962	46,375
Stock compensation and other non-cash charges	3,329	2,743
Amortization of deferred financing costs	639	1,067
(Gain) Loss on extinguishment of debt	0	(2,567)
(Gain) Loss on sale of properties	0	(38)
Change in operating assets and liabilities:
Accounts receivable	12,413	9,064
Prepayments and other assets	(591)	(1,364)
Accounts payable, accrued and other liabilities	12,253	(1,661)
Amounts payable to oil and gas property owners	(4,036)	6,838
Production taxes payable	(3,864)	(7,099)
Net cash provided by (used in) operating activities	40,515	53,825
Investing Activities:
Additions to oil and gas properties, including acquisitions	(61,261)	(111,009)
Additions of furniture, equipment and other	(782)	(609)
Proceeds from sale of properties and other investing activities	(1,238)	66,415
Cash paid for short-term investments	0	(114,883)
Net cash provided by (used in) investing activities	(63,281)	(160,086)
Financing Activities:
Principal payments on debt	(109)	(24,871)
Deferred financing costs and other	(398)	(1,000)
Net cash provided by (used in) financing activities	(507)	(25,871)
Increase (Decrease) in Cash and Cash Equivalents	(23,273)	(132,132)
Beginning Cash and Cash Equivalents	128,836	165,904
Ending Cash and Cash Equivalents	$ 105,563	$ 33,772

CONSOLIDATED STATEMENTS OF STOC

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings (Accumulated Deficit)	Treasury Stock	Accumulated Other Comprehensive Income
Balance at Dec. 31, 2014	$ 1,029,488	$ 48	$ 913,619	$ 115,821	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of options, restricted stock activity and shares exchanged for exercise and tax withholding	(1,173)				(1,173)
Stock-based compensation	10,468		10,468
Retirement of treasury stock	0		(1,173)		1,173
Settlement of convertible notes	(1,596)	0	(1,596)	0	0	$ 0
Net income (loss)	(487,771)			(487,771)
Balance at Dec. 31, 2015	549,416	48	921,318	(371,950)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of options, restricted stock activity and shares exchanged for exercise and tax withholding	(383)	1			(384)
Stock-based compensation	3,440		3,440
Retirement of treasury stock	0		(384)		384
Net income (loss)	(46,496)			(46,496)
Balance at Mar. 31, 2016	$ 505,977	$ 49	$ 924,374	$ (418,446)	$ 0

Organization

Organization	3 Months Ended
	Mar. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization	Organization Bill Barrett Corporation, a Delaware corporation, together with its wholly-owned subsidiaries (collectively, the "Company"), is an independent oil and gas company engaged in the exploration, development and production of crude oil, natural gas and natural gas liquids ("NGLs"). Since its inception in January 2002, the Company has conducted its activities principally in the Rocky Mountain region of the United States.

Summary of Significant Accounti

Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2016
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Basis of Presentation. The accompanying Unaudited Consolidated Financial Statements include the accounts of the Company. These statements have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP"). All intercompany accounts and transactions have been eliminated in consolidation. In the opinion of management, the accompanying financial statements include all adjustments (consisting of normal recurring accruals and adjustments) necessary to present fairly, in all material respects, the Company's interim results. However, operating results for the periods presented are not necessarily indicative of the results that may be expected for the full year. The Company's Annual Report on Form 10-K includes certain definitions and a summary of significant accounting policies and should be read in conjunction with this Quarterly Report on Form 10-Q. Except as disclosed herein, there have been no material changes to the information disclosed in the notes to the consolidated financial statements included in the Company's 2015 Annual Report on Form 10-K. Use of Estimates. In the course of preparing the Company's financial statements in accordance with GAAP, management makes various assumptions, judgments and estimates to determine the reported amount of assets, liabilities, revenues and expenses and in the disclosure of commitments and contingencies. Changes in these assumptions, judgments and estimates will occur as a result of the passage of time and the occurrence of future events and, accordingly, actual results could differ from amounts initially established. Areas requiring the use of assumptions, judgments and estimates relate to volumes of oil, natural gas and NGL reserves used in calculating depreciation, depletion and amortization ("DD&A"), the amount of expected future cash flows used in determining possible impairments of proved oil and gas properties and the amount of future capital costs used in these calculations. Assumptions, judgments and estimates also are required in determining asset retirement obligations, the timing of dry hole costs, impairments of unproved oil and gas properties, valuing deferred tax assets and estimating fair values of derivative instruments and stock-based payment awards. Accounts Receivable. Accounts receivable is comprised of the following: As of March 31, 2016 As of December 31, 2015 (in thousands) Accrued oil, gas and NGL sales $ 22,775 $ 33,594 Due from joint interest owners 6,434 8,373 Other 1,839 1,508 Allowance for doubtful accounts — (14 ) Total accounts receivable $ 31,048 $ 43,461 Oil and Gas Properties. The Company's oil, gas and NGL exploration and production activities are accounted for using the successful efforts method. Under this method, all property acquisition costs and costs of exploratory and development wells are capitalized when incurred, pending determination of whether the well has found proved reserves. If an exploratory well does not find proved reserves, the costs of drilling the well are charged to expense and remain within cash flows from investing activities in the Unaudited Consolidated Statements of Cash Flows. If an exploratory well does find proved reserves, the costs remain capitalized and are included within additions to oil and gas properties and remain within cash flows from investing activities in the Unaudited Consolidated Statements of Cash Flows. The costs of development wells are capitalized whether proved reserves are added or not. Oil and gas lease acquisition costs are also capitalized. Upon sale or retirement of depreciable or depletable property, the cost and related accumulated DD&A are eliminated from the accounts and the resulting gain or loss is recognized. Other exploration costs, including certain geological and geophysical expenses and delay rentals for oil and gas leases, are charged to expense as incurred. The sale of a partial interest in a proved property is accounted for as a cost recovery and no gain or loss is recognized as long as this treatment does not significantly affect the unit-of-production amortization rate. Maintenance and repairs are charged to expense, and renewals and betterments are capitalized to the appropriate property and equipment accounts. Unproved oil and gas property costs are transferred to proved oil and gas properties if the properties are subsequently determined to be productive or are assigned proved reserves. Proceeds from sales of partial interests in unproved leases are accounted for as a recovery of cost without recognizing any gain until all costs are recovered. Unproved oil and gas properties are assessed periodically for impairment based on remaining lease terms, drilling results, reservoir performance, commodity price outlooks, future plans to develop acreage and other relevant matters. Materials and supplies consist primarily of tubular goods and well equipment to be used in future drilling operations or repair operations and are carried at the lower of cost or market value, on a first-in, first-out basis. The following table sets forth the net capitalized costs and associated accumulated DD&A and non-cash impairments relating to the Company's oil, natural gas and NGL producing activities: As of March 31, 2016 As of December 31, 2015 (in thousands) Proved properties $ 300,444 $ 320,538 Wells and related equipment and facilities 1,064,556 1,592,716 Support equipment and facilities 56,149 77,785 Materials and supplies 5,836 9,171 Total proved oil and gas properties (1) $ 1,426,985 $ 2,000,210 Unproved properties 31,554 33,336 Wells and facilities in progress 89,900 45,862 Total unproved oil and gas properties, excluded from amortization (1) $ 121,454 $ 79,198 Accumulated depreciation, depletion, amortization and impairment (1) (416,336 ) (918,510 ) Total oil and gas properties, net (1) $ 1,132,103 $ 1,160,898 (1) Excludes oil and gas properties held for sale of $33.7 million , comprised of $572.2 million of proved oil and gas properties and $4.3 million of unproved oil and gas properties, net of accumulated depreciation, depletion, amortization and impairment of $542.8 million . Held for sale balances are included in current assets as assets held for sale, net of amortization and impairment, in the Unaudited Consolidated Balance Sheet as of March 31, 2016. See Note 4 for additional information on assets held for sale. The Company reviews proved oil and gas properties on a field-by-field basis for impairment on a quarterly basis or whenever events and circumstances indicate that a decline in the recoverability of their carrying value may have occurred. The Company estimates the expected undiscounted future net cash flows of its oil and gas properties based on the Company's best estimate of development plans, future production, commodity pricing, gathering and transportation deductions, production tax rates, lease operating expenses and future development costs. The Company compares such undiscounted future net cash flows to the carrying amount of the oil and gas properties to determine if the carrying amount is recoverable. If the undiscounted future net cash flows exceed the carrying amount of the proved oil and gas properties, no impairment is taken. If the carrying value of a property exceeds the undiscounted future net cash flows, the Company will impair the carrying value to fair value based on an analysis of quantitative and qualitative factors existing as of the balance sheet date. The Company does not believe that the undiscounted future net cash flows analysis of its proved property represents the applicable market value. The factors used to determine fair value include, but are not limited to, recent sales prices of comparable properties, indications from marketing activities, the present value of future revenues, net of estimated operating and development costs using estimates of reserves, future commodity pricing, future production estimates, anticipated capital expenditures and various discount rates commensurate with the risk and current market conditions associated with realizing the projected cash flows. Oil and gas properties are assessed for impairment once they meet the criteria to be classified as held for sale. Assets held for sale are carried at the lower of carrying cost or fair value less costs to sell. The fair value of the assets is determined using a market approach, based on an estimated selling price, as evidenced by current marketing activities, if possible. If an estimated selling price is not available, the Company utilizes the income valuation technique which involves calculating the present value of future revenues, as discussed above. If the carrying amount of the assets exceeds the fair value less costs to sell, an impairment will result to reduce the value of the properties down to fair value less costs to sell. The Company recognized non-cash impairment, dry hole costs and abandonment expense in the Unaudited Consolidated Statements of Operations, as follows: Three Months Ended March 31, 2016 2015 (in thousands) Non-cash impairment of proved oil and gas properties $ — $ — Non-cash impairment of unproved oil and gas properties 183 58 Dry hole costs 57 15 Abandonment expense and lease expirations 318 1,182 Total non-cash impairment, dry hole costs and abandonment expense $ 558 $ 1,255 The provision for DD&A of oil and gas properties is calculated on a field-by-field basis using the unit-of-production method. Natural gas and NGLs are converted to an oil equivalent, Boe, at the standard rate of six Mcf to one Boe and forty-two gallons to one Boe, respectively. Estimated future dismantlement, restoration and abandonment costs are taken into consideration by this calculation. Accounts Payable and Accrued Liabilities. Accounts payable and accrued liabilities are comprised of the following: As of March 31, 2016 As of December 31, 2015 (in thousands) Accrued drilling, completion and facility costs $ 16,296 $ 32,895 Accrued lease operating, gathering, transportation and processing expenses 5,031 4,930 Accrued general and administrative expenses 5,282 10,962 Accrued interest payable 28,545 13,918 Trade payables and other 4,017 1,632 Total accounts payable and accrued liabilities $ 59,171 $ 64,337 Environmental Liabilities. Environmental expenditures that relate to an existing condition caused by past operations and that do not contribute to current or future revenue generation are expensed. Environmental liabilities are accrued when environmental assessments and/or clean-ups are probable, and the costs can be reasonably estimated. Revenue Recognition. Oil, gas and NGL revenues are recognized when production is sold to a purchaser at a fixed or determinable price, when delivery has occurred and title has transferred, and collectability of the revenue is reasonably assured. The Company uses the sales method to account for gas and NGL imbalances. Under this method, revenues are recorded on the basis of gas and NGLs actually sold by the Company. In addition, the Company records revenues for its share of gas and NGLs sold by other owners that cannot be volumetrically balanced in the future due to insufficient remaining reserves. The Company also reduces revenues for other owners' volumetric share of gas and NGLs sold by the Company that cannot be volumetrically balanced in the future due to insufficient remaining reserves. The Company's remaining over- and under-produced gas and NGLs balancing positions are taken into account in determining the Company's proved oil, gas and NGL reserves. Imbalances at March 31, 2016 and 2015 were not material. Derivative Instruments and Hedging Activities. The Company periodically uses derivative financial instruments to achieve a more predictable cash flow from its oil, natural gas and NGL sales by reducing its exposure to price fluctuations. Derivative instruments are recorded at fair market value and are included in the Unaudited Consolidated Balance Sheets as assets or liabilities and in the Unaudited Consolidated Statements of Operations as commodity derivative gain (loss). Income Taxes. Income taxes are provided for the tax effects of transactions reported in the financial statements and consist of taxes currently payable plus deferred income taxes related to certain income and expenses recognized in different periods for financial and income tax reporting purposes. Deferred income tax assets and liabilities represent the future tax return consequences of those differences, which will either be taxable or deductible when assets are recovered or liabilities are settled. Deferred income taxes also include tax credits and net operating losses that are available to offset future income taxes. Deferred income taxes are measured by applying currently enacted tax rates. Deferred tax assets are regularly reviewed, considering all positive and negative evidence, including scheduled reversals of deferred tax liabilities, projected future taxable income, taxable strategies and results of recent operations. The assumptions about future taxable income require significant judgment to determine whether it is more likely than not that the deferred tax asset will be realized. The Company accounts for uncertainty in income taxes for tax positions taken or expected to be taken in a tax return. Only tax positions that meet the more-likely-than-not recognition threshold are recognized. The Company does not have any uncertain tax positions recorded as of March 31, 2016 . Earnings/Loss Per Share. Basic net income (loss) per common share is calculated by dividing net income (loss) attributable to common stock by the weighted average number of common shares outstanding during each period. Diluted net income per common share is calculated by dividing net income attributable to common stock by the weighted average number of common shares outstanding and other dilutive securities. Potentially dilutive securities for the diluted net income per common share calculations consist of nonvested equity shares of common stock, in-the-money outstanding stock options to purchase the Company's common stock and shares into which the Convertible Notes are convertible. No potential common shares are included in the computation of any diluted per share amount when a net loss exists, as was the case for the three months ended March 31, 2016 and 2015 . The following table sets forth the calculation of basic and diluted income (loss) per share: Three Months Ended March 31, 2016 2015 (in thousands, except per share amounts) Net income (loss) $ (46,496 ) $ (11,731 ) Basic weighted-average common shares outstanding in period 48,499 48,199 Diluted weighted-average common shares outstanding in period 48,499 48,199 Basic net income (loss) per common share $ (0.96 ) $ (0.24 ) Diluted net income (loss) per common share $ (0.96 ) $ (0.24 ) New Accounting Pronouncements. In March 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2016-09, Improvements to Employee Share-Based Payment Accounting . The objective of this update is to simplify the current guidance for stock compensation. The areas for simplification involve several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities and classification on the statement of cash flows. ASU 2016-09 is effective for the annual periods beginning after December 15, 2016, and interim periods within those annual periods. The Company is currently evaluating the impact of adopting this standard. In February 2016, the FASB issued ASU 2016-02, Leases . The objective of this update is to increase transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. ASU 2016-02 is effective for the annual periods beginning after December 15, 2018, and interim periods within those annual periods. The Company is currently evaluating the impact of adopting this standard. In November 2015, the FASB issued ASU 2015-17, Balance Sheet Classification of Deferred Taxes . The objective of this update is to require deferred tax liabilities and assets be classified as noncurrent in a classified statement of financial position. ASU 2015-17 is effective for the annual periods beginning after December 15, 2016, and interim periods within those annual periods. The standard will be adopted retrospectively and will not have a significant impact on the Company's disclosures and financial statements. In April 2015, the FASB issued ASU 2015-03, Simplifying the Presentation of Debt Issuance Costs . The objective of this update is to require that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct reduction from the carrying amount of that debt liability, consistent with debt discounts. In August 2015, the FASB issued ASU 2015-15, Presentation and Subsequent Measurement of Debt Issuance Costs Associated with Line-of-Credit Arrangements . This ASU amends ASU 2015-03 which had not addressed the balance sheet presentation of debt issuance costs incurred in connection with line-of-credit arrangements. Under ASU 2015-15, a Company may defer debt issuance costs associated with line-of-credit arrangements and present such costs as an asset, subsequently amortizing the deferred debt issuance costs ratably over the term of the line-of-credit arrangement, regardless of whether there are any outstanding borrowings. ASU 2015-03 and ASU 2015-15 are effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015, should be applied retrospectively and represent a change in accounting principle. The Company adopted ASU 2015-03 and ASU 2015-15 as of March 31, 2016, and as a result, $8.7 million of debt issuance costs related to the Company’s senior notes and convertible senior notes was reclassified from deferred financing costs and other noncurrent assets to long-term debt in the Company’s consolidated balance sheets as of December 31, 2015. The Company elected to continue presenting the debt issuance costs associated with its credit facility within deferred financing costs and other noncurrent assets in the consolidated balance sheets. In August 2014, the FASB issued ASU 2014-15, Disclosure of Uncertainties about an Entity's Ability to Continue as a Going Concern. The objective of this update is to provide guidance in GAAP about management's responsibility to evaluate whether there is substantial doubt about an entity's ability to continue as a going concern and to provide related footnote disclosures. ASU 2014-15 is effective for the annual period ending after December 15, 2016, and for annual periods and interim periods thereafter. The standard will be adopted prospectively. In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers. The objective of this update is to clarify the principles for recognizing revenue and to develop a common revenue standard. ASU 2015-14 deferred the effective reporting periods of ASU 2014-09, and it is now effective for annual reporting periods beginning after December 15, 2017, including interim periods within that reporting period. The Company is currently evaluating the impact of adopting this standard.

Supplemental Disclosures of Cas

Supplemental Disclosures of Cash Flow Information	3 Months Ended
	Mar. 31, 2016
Supplemental Cash Flow Elements [Abstract]
Supplemental Disclosures of Cash Flow Information	Supplemental Disclosures of Cash Flow Information Supplemental cash flow information is as follows: Three Months Ended March 31, 2016 2015 (in thousands) Cash paid for interest $ 480 $ 1,105 Cash paid for income taxes — 1,050 Supplemental disclosures of non-cash investing and financing activities: Accrued liabilities - oil and gas properties 17,518 74,984 Change in asset retirement obligations, net of disposals (60 ) (525 ) Retirement of treasury stock (384 ) (975 )

Assets Held for Sale

Assets Held for Sale	3 Months Ended
	Mar. 31, 2016
Property, Plant and Equipment [Abstract]
Assets Held for Sale	Assets Held for Sale Assets are classified as held for sale when the Company commits to a plan to sell the assets and there is reasonable certainty the sale will take place within one year. Upon classification as held for sale, long-lived assets are analyzed for impairment to identify and expense any excess of carrying value over fair value less costs to sell. In addition, the assets are no longer depreciated or depleted. During the three months ended March 31, 2016, the Company committed to a plan to sell certain non-core assets in the Uinta Basin. Therefore, the related assets and liabilities were classified as held for sale in the Unaudited Consolidated Balance Sheet as of March 31, 2016. Assets held for sale are recorded at the lesser of their respective carrying value or fair value less estimated costs to sell. The fair value of the net assets held for sale was $28.9 million and was presented as assets held for sale, net of amortization and impairment, of $33.7 million and liabilities associated with assets held for sale of $4.8 million on the Unaudited Consolidated Balance Sheet as of March 31, 2016.

Long-Term Debt

Long-Term Debt	3 Months Ended
	Mar. 31, 2016
Debt Disclosure [Abstract]
Long-Term Debt	Long-Term Debt The Company's outstanding debt is summarized below: As of March 31, 2016 As of December 31, 2015 Maturity Date Principal Debt Issuance Costs Carrying Amount Principal Debt Issuance Costs Carrying Amount (in thousands) Amended Credit Facility April 9, 2020 $ — $ — $ — $ — $ — $ — Convertible Notes (1)(2) March 15, 2028 579 — 579 579 — 579 7.625% Senior Notes (3) October 1, 2019 400,000 (3,502 ) 396,498 400,000 (3,752 ) 396,248 7.0% Senior Notes (4) October 15, 2022 400,000 (4,771 ) 395,229 400,000 (4,953 ) 395,047 Lease Financing Obligation (5) August 10, 2020 3,113 (4 ) 3,109 3,222 (4 ) 3,218 Total Debt $ 803,692 $ (8,277 ) $ 795,415 $ 803,801 $ (8,709 ) $ 795,092 Less: Current Portion of Long-Term Debt (6) 443 — 443 440 — 440 Total Long-Term Debt $ 803,249 $ (8,277 ) $ 794,972 $ 803,361 $ (8,709 ) $ 794,652 (1) The aggregate estimated fair value of the Convertible Notes was approximately $0.5 million as of March 31, 2016 and December 31, 2015 based on reported market trades of these instruments. (2) The Company has the right at any time, with at least 30 days' notice, to call the remaining Convertible Notes, and the holders have the right to require the Company to purchase the notes on each of March 20, 2018 and March 20, 2023. (3) The aggregate estimated fair value of the 7.625% Senior Notes was approximately $270.0 million and $270.2 million as of March 31, 2016 and December 31, 2015 , respectively, based on reported market trades of these instruments. (4) The aggregate estimated fair value of the 7.0% Senior Notes was approximately $242.0 million and $272.0 million as of March 31, 2016 and December 31, 2015 , respectively, based on reported market trades of these instruments. (5) The aggregate estimated fair value of the Lease Financing Obligation was approximately $3.0 million as of March 31, 2016 and $3.1 million as of December 31, 2015 . Because there is no active, public market for the Lease Financing Obligation, the aggregate estimated fair value was based on market-based parameters of comparable term secured financing instruments. (6) The current portion of the long-term debt as of March 31, 2016 and December 31, 2015 includes the current portion of the Lease Financing Obligation. Amended Credit Facility The Amended Credit Facility had commitments and a borrowing base of $375.0 million from 13 lenders as of March 31, 2016 . As of March 31, 2016 , the Company had no amounts outstanding under the Amended Credit Facility. As credit support for future payment under a contractual obligation, a $26.0 million letter of credit was issued under the Amended Credit Facility, which reduced the available borrowing capacity of the Amended Credit Facility as of March 31, 2016 to $349.0 million . Interest rates are LIBOR plus applicable margins of 1.5% to 2.5% or ABR plus 0.5% to 1.5% and the unused commitment fee is between 0.375% and 0.5% based on borrowing base utilization. There have not been any borrowings under the Amended Credit Facility in 2016. The borrowing base under the Amended Credit Facility is determined at the discretion of the lenders, based on the collateral value of our proved reserves that have been mortgaged to such lenders, and is subject to regular re-determinations on or about April 1 and October 1 of each year, as well as following any property sales. On April 11, 2016, the borrowing base was reduced to $335.0 million based on proved reserves and commodity hedge position in place at December 31, 2015. The Company's re-determined borrowing capacity of $335.0 million is reduced by $26.0 million to $309.0 million due to an outstanding irrevocable letter of credit related to a firm transportation agreement. Future borrowing bases will be computed based on proved oil, natural gas and NGL reserves, hedge positions and estimated future cash flows from those reserves calculated using future commodity pricing provided by our lenders, as well as any other outstanding debt. Lower commodity prices will impact the amount lenders will provide for a borrowing base. The Amended Credit Facility also contains certain financial covenants. The Company is currently in compliance with all financial covenants and has complied with all financial covenants since issuance. If the Company fails to comply with the covenants or other terms of any agreements governing the Company's debt, the Company's lenders and holders of the Company's convertible notes and senior notes may have the right to accelerate the maturity of that debt and foreclose upon the collateral, if any, securing that debt. Realization of any of these factors could adversely affect the Company's financial condition. In September 2015, the Company obtained an amendment to the Amended Credit Facility that replaced the Company's debt-to-EBITDAX covenant in the facility with a secured debt-to-EBITDAX covenant and an EBITDAX-to-interest covenant through March 31, 2018. There can be no assurance that the Company will be able to obtain similar amendments, or waivers of covenant breaches, in the future if needed. 5% Convertible Senior Notes Due 2028 On March 12, 2008, the Company issued $172.5 million aggregate principal amount of Convertible Notes. On March 20, 2012, $147.2 million of the outstanding principal amount, or approximately 85% of the outstanding Convertible Notes, were put to the Company and redeemed by the Company at par. On March 20, 2015, $24.8 million of the remaining outstanding principal amount, or approximately 98% of the remaining outstanding Convertible Notes, were put to the Company and redeemed by the Company at par. After the redemption, $0.6 million aggregate principal amount of the Convertible Notes were outstanding as of March 31, 2016 . The Convertible Notes mature on March 15, 2028 , unless earlier converted, redeemed or purchased by the Company. The Convertible Notes are senior unsecured obligations and rank equal in right of payment to all of the Company's existing and future senior unsecured indebtedness, are senior in right of payment to all of the Company's future subordinated indebtedness, and are effectively subordinated to all of the Company's secured indebtedness with respect to the collateral securing such indebtedness. The Convertible Notes are structurally subordinated to all present and future secured and unsecured debt and other obligations of the Company's subsidiaries. The Convertible Notes are fully and unconditionally guaranteed by the subsidiaries that guarantee the Company's indebtedness under the Amended Credit Facility, the 7.625% Senior Notes and the 7.0% Senior Notes. The Convertible Notes bear interest at a rate of 5% per annum, payable semi-annually in arrears on March 15 and September 15 of each year. Holders of the remaining Convertible Notes may require the Company to purchase all or a portion of their Convertible Notes for cash on each of March 20, 2018 and March 20, 2023 at a purchase price equal to 100% of the principal amount of the Convertible Notes to be repurchased, plus accrued and unpaid interest, if any, up to but excluding the applicable purchase date. The Company has the right with at least 30 days' notice to call the Convertible Notes. 7.625% Senior Notes Due 2019 On September 27, 2011, the Company issued $400.0 million in principal amount of 7.625% Senior Notes due 2019 at par. The 7.625% Senior Notes mature on October 1, 2019 . Interest is payable in arrears semi-annually on April 1 and October 1 of each year. The 7.625% Senior Notes are senior unsecured obligations of the Company and rank equal in right of payment with all of the Company's other existing and future senior unsecured indebtedness, including the Convertible Notes and 7.0% Senior Notes. The 7.625% Senior Notes are currently redeemable at the Company's option at a specified redemption price. The 7.625% Senior Notes are fully and unconditionally guaranteed by the subsidiaries that guarantee the Company's indebtedness under the Amended Credit Facility, the Convertible Notes and the 7.0% Senior Notes. The 7.625% Senior Notes include certain covenants that limit the Company's ability to incur additional indebtedness, make restricted payments, create liens or sell assets and that generally prohibit the Company from paying dividends. The Company is currently in compliance with all financial covenants and has complied with all financial covenants since issuance. 7.0% Senior Notes Due 2022 On March 12, 2012, the Company issued $400.0 million in aggregate principal amount of 7.0% Senior Notes due 2022 at par. The 7.0% Senior Notes mature on October 15, 2022 . Interest is payable in arrears semi-annually on April 15 and October 15 of each year. The 7.0% Senior Notes are senior unsecured obligations and rank equal in right of payment with all of the Company's other existing and future senior unsecured indebtedness, including the Convertible Notes and 7.625% Senior Notes. The 7.0% Senior Notes are redeemable at the Company's option beginning on October 15, 2017 at an initial redemption price of 103.5% of the principal amount of the notes. The 7.0% Senior Notes are fully and unconditionally guaranteed by the subsidiaries that guarantee the Company's indebtedness under the Amended Credit Facility, the Convertible Notes and the 7.625% Senior Notes. The 7.0% Senior Notes include certain covenants that limit the Company's ability to incur additional indebtedness, make restricted payments, create liens or sell assets and that generally prohibit the Company from paying dividends. The Company is currently in compliance with all financial covenants and has complied with all financial covenants since issuance. Lease Financing Obligation Due 2020 The Company has a lease financing obligation with a balance of $3.1 million as of March 31, 2016 resulting from the Company's sale and subsequent lease back of certain compressors and related facilities owned by the Company (the "Lease Financing Obligation"). The Lease Financing Obligation expires on August 10, 2020 , and the Company has the option to purchase the equipment at the end of the lease term for the then current fair market value. The Lease Financing Obligation also contains an early buyout option pursuant to which the Company may purchase the equipment for $1.8 million on February 10, 2019. The lease payments related to the equipment are recognized as principal and interest expense based on a weighted average implicit interest rate of 3.3% . See Note 12 for discussion of aggregate minimum future lease payments. The following table summarizes, for the periods indicated, the cash or accrued portion of interest expense related to the Amended Credit Facility, the outstanding Convertible Notes, the 7.625% Senior Notes, the 7.0% Senior Notes and the Lease Financing Obligation along with the non-cash portion resulting from the amortization of the debt discount and transaction costs through interest expense: Three Months Ended March 31, 2016 2015 (in thousands) Amended Credit Facility (1) Cash interest $ 438 $ 433 Non-cash interest $ 207 $ 586 Convertible Notes (2) Cash interest $ 22 $ 276 Non-cash interest $ — $ 3 7.625% Senior Notes (3) Cash interest $ 7,625 $ 7,625 Non-cash interest $ 250 $ 273 7.0% Senior Notes (4) Cash interest $ 7,000 $ 7,000 Non-cash interest $ 181 $ 204 Lease Financing Obligation (5) Cash interest $ 26 $ 29 Non-cash interest $ — $ — (1) Cash interest includes amounts related to interest and commitment fees incurred on the Amended Credit Facility and participation and fronting fees paid on the letter of credit. (2) The stated interest rate for the Convertible Notes is 5% per annum. The effective interest rate of the Convertible Notes includes amortization of the debt discount, which represented the fair value of the equity conversion feature at the time of issue. The stated interest rate of 5% on the Convertible Notes will be the effective interest rate of the $0.6 million remaining principal balance, as the related debt discount was fully amortized as of March 31, 2012. (3) The stated interest rate for the 7.625% Senior Notes is 7.625% per annum with an effective interest rate of 8.0% per annum. (4) The stated interest rate for the 7.0% Senior Notes is 7.0% per annum with an effective interest rate of 7.2% per annum. (5) The effective interest rate for the Lease Financing Obligation is 3.3% per annum.

Asset Retirement Obligations

Asset Retirement Obligations	3 Months Ended
	Mar. 31, 2016
Asset Retirement Obligation Disclosure [Abstract]
Asset Retirement Obligations	Asset Retirement Obligations A reconciliation of the Company's asset retirement obligations for the three months ended March 31, 2016 is as follows (in thousands): As of December 31, 2015 $ 15,176 Liabilities incurred — Liabilities settled (8 ) Disposition of properties (52 ) Accretion expense 274 Revisions to estimate — As of March 31, 2016 $ 15,390 Less: liabilities associated with assets held for sale 4,785 Less: current asset retirement obligations 502 Long-term asset retirement obligations $ 10,103

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2016
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date (exit price). The Company uses market data or assumptions that market participants would use in pricing the asset or liability, including assumptions about risk. These inputs can be readily observable, market corroborated or generally unobservable. A fair value hierarchy was established that prioritizes the inputs used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). Level 1 – Quoted prices are available in active markets for identical assets or liabilities as of the reporting date. Active markets are those in which transactions for the asset or liability occur in sufficient frequency and volume to provide pricing information on an ongoing basis. Level 2 – Quoted prices are available in active markets for similar assets or liabilities and in non-active markets for identical or similar instruments. Model-derived valuations have inputs that are observable or whose significant value drivers are observable. These models are primarily industry-standard models that consider various assumptions, including quoted forward prices for commodities, time value, volatility factors and current market and contractual prices for the underlying instruments, as well as other relevant economic measures. Substantially all of these assumptions are observable in the marketplace throughout the full term of the instrument, can be derived from observable data or are supported by observable levels at which transactions are executed in the marketplace. Level 3 – Pricing inputs include significant inputs that are generally less observable than objective sources. These inputs may be used with internally developed methodologies that result in management's best estimate of fair value. At each balance sheet date, the Company performs an analysis of all applicable instruments and includes in Level 3 all of those whose fair value is based on significant unobservable inputs. The following tables set forth by level within the fair value hierarchy the Company's assets and liabilities that were measured at fair value in the Unaudited Consolidated Balance Sheets. As of March 31, 2016 Level 1 Level 2 Level 3 Total (in thousands) Assets Cash equivalents (1) $ 60,095 $ — $ — $ 60,095 Deferred compensation plan (1) 1,208 — — 1,208 Commodity derivatives (1) — 95,184 — 95,184 Assets held for sale (2) — — 33,717 33,717 Liabilities Commodity derivatives (1) $ — $ 7 $ — $ 7 Liabilities associated with assets held for sale (2) — — 4,785 4,785 (1) This represents a financial asset or liability that is measured at fair value on a recurring basis. (2) This represents a non-financial asset or liability that is measured at fair value on a nonrecurring basis. As of December 31, 2015 Level 1 Level 2 Level 3 Total (in thousands) Assets Cash equivalents (1) $ 60,065 $ — $ — $ 60,065 Deferred compensation plan (1) 1,231 — — 1,231 Commodity derivatives (1) — 119,471 — 119,471 Proved oil and gas properties (2) — — 178,221 178,221 Unproved oil and gas properties (2) — — 5,539 5,539 (1) This represents a financial asset or liability that is measured at fair value on a recurring basis. (2) This represents a non-financial asset or liability that is measured at fair value on a nonrecurring basis. Cash equivalents – The highly liquid cash equivalents are recorded at carrying value, which approximates fair value, which represent Level 1 inputs. Deferred compensation plan – The Company maintains a non-qualified deferred compensation plan which allows certain management employees to defer receipt of a portion of their compensation. The Company maintains assets for the deferred compensation plan in a rabbi trust. The assets of the rabbi trust are invested in publicly traded mutual funds and are recorded in other current and other long-term assets in the Unaudited Consolidated Balance Sheets. The deferred compensation plan financial assets are reported at fair value based on active market quotes, which represent Level 1 inputs. Commodity derivatives – The fair value of crude oil, natural gas and NGL forwards and options are estimated using a combined income and market valuation methodology with a mid-market pricing convention based upon forward commodity price and volatility curves. The curves are obtained from independent pricing services reflecting broker market quotes. The Company did not make any adjustments to the obtained curves. The pricing services publish observable market information from multiple brokers and exchanges. No proprietary models are used by the pricing services for the inputs. The Company utilized the counterparties' valuations to assess the reasonableness of the Company's valuations. The commodity derivatives have been adjusted for non-performance risk. For applicable financial assets carried at fair value, the credit standing of the counterparties is analyzed and factored into the fair value measurement of those assets. In addition, the fair value measurement of a liability has been adjusted to reflect the nonperformance risk of the Company. The following methods and assumptions were used to estimate the fair values of the assets and liabilities in the table above. Oil and gas properties – 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. If an impairment is necessary, the fair value is estimated by using either a market approach based on recent sales prices of comparable properties and/or indications from marketing activities or by using the income valuation technique which involves calculating the present value of future revenues. The present value, net of estimated operating and development costs, is calculated using estimates of reserves, future commodity pricing, future production estimates, anticipated capital expenditures and various discount rates commensurate with the risk and current market conditions associated with realizing the projected cash flows, predominantly all of which are designated as Level 3 inputs within the fair value hierarchy. During the year ended December 31, 2015, the Company reduced its Uinta Oil Program assets to a fair value of $183.8 million , resulting in a non-cash impairment charge of $572.4 million . Properties classified as held for sale are valued using a market approach, based on an estimated selling price, as evidenced by current marketing activities, if possible. If an estimated selling price is not available, the Company utilizes the income valuation technique discussed above. The fair value of net assets classified as held for sale was $28.9 million as of March 31, 2016 . See Note 4 for additional information on assets held for sale. Long-term Debt – Long-term debt is not presented at fair value on the Unaudited Consolidated Balance Sheets, as it is recorded at carrying value, net of unamortized debt issuance costs. The fair values of the Company's fixed rate 7.625% Senior Notes and 7.0% Senior Notes totaled $512.0 million as of March 31, 2016 . The fair values of the Company's fixed rate 7.625% Senior Notes and 7.0% Senior Notes totaled $542.2 million as of December 31, 2015 . The fair values of the Company's fixed rate Senior Notes are based on active market quotes, which represent Level 1 inputs. There is no active, public market for the Amended Credit Facility, Convertible Notes or Lease Financing Obligation. The recorded value of the Amended Credit Facility, approximates its fair value due to its floating rate structure based on the LIBOR spread and the Company's borrowing base utilization. The Amended Credit Facility had a balance of zero as of March 31, 2016 and December 31, 2015 . The Convertible Notes had a fair value of $0.5 million as of March 31, 2016 and December 31, 2015 and are measured based on market-based parameters of the various components of the Convertible Notes and over the counter trades. The Lease Financing Obligation fair values of $3.0 million and $3.1 million as of March 31, 2016 and December 31, 2015 , respectively, are measured based on market-based parameters of comparable term secured financing instruments. The fair value measurements for the Amended Credit Facility, Convertible Notes and Lease Financing Obligation represent Level 2 inputs.

Derivative Instruments

Derivative Instruments	3 Months Ended
	Mar. 31, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments	Derivative Instruments The Company uses financial derivative instruments as part of its price risk management program to achieve a more predictable cash flow from its production revenues by reducing its exposure to commodity price fluctuations. The Company has entered into financial commodity swap contracts related to the sale of a portion of the Company's production. The Company does not enter into derivative instruments for speculative or trading purposes. In addition to financial contracts, the Company may at times be party to various physical commodity contracts for the sale of oil, natural gas and NGLs that have varying terms and pricing provisions. These physical commodity contracts qualify for the normal purchase and normal sale exception and, therefore, are not subject to hedge or mark-to-market accounting. The financial impact of physical commodity contracts is included in oil, natural gas and NGL production revenues at the time of settlement. All derivative instruments, other than those that meet the normal purchase and normal sale exception, as mentioned above, are recorded at fair value and included in the Unaudited Consolidated Balance Sheets as assets or liabilities. The following table summarizes the location, as well as the gross and net fair value amounts of all derivative instruments presented in the Unaudited Consolidated Balance Sheets as of the dates indicated. As of March 31, 2016 Balance Sheet Gross Amounts of Recognized Assets Gross Amounts Offset in the Balance Sheet Net Amounts of Assets Presented in the Balance Sheet (in thousands) Derivative assets (current) $ 80,381 $ (7 ) (1) $ 80,374 Derivative assets (noncurrent) 14,803 — 14,803 Total derivative assets $ 95,184 $ (7 ) $ 95,177 Gross Amounts of Recognized Liabilities Gross Amounts Offset in the Balance Sheet Net Amounts of Liabilities Presented in the Balance Sheet (in thousands) Derivative liabilities $ (7 ) $ 7 (1) $ — Derivatives and other noncurrent liabilities — — — Total derivative liabilities $ (7 ) $ 7 $ — As of December 31, 2015 Balance Sheet Gross Amounts of Recognized Assets Gross Amounts Offset in the Balance Sheet Net Amounts of Assets Presented in the Balance Sheet (in thousands) Derivative assets (current) $ 99,809 $ — $ 99,809 Derivative assets (noncurrent) 19,662 — 19,662 Total derivative assets $ 119,471 $ — $ 119,471 (1) Asset and liability balances with the same counterparty are presented as a net asset or liability on the Unaudited Consolidated Balance Sheets. As of March 31, 2016 , the Company had financial derivative instruments in place related to the sale of a portion of the Company's production for the following volumes for the periods indicated: April – December 2016 For the year 2017 Derivative Weighted Average Price Derivative Volumes Weighted Average Price Oil (Bbls) 1,906,300 $ 78.25 683,250 $ 75.61 Natural Gas (MMbtu) 1,375,000 $ 4.10 — $ — The Company's derivative financial instruments are generally executed with major financial or commodities trading institutions that expose the Company to market and credit risks and may, at times, be concentrated with certain counterparties or groups of counterparties. The Company had derivatives in place with eight different counterparties as of March 31, 2016 . Although notional amounts are used to express the volume of these contracts, the amounts potentially subject to credit risk, in the event of non-performance by the counterparties, are substantially smaller. The creditworthiness of counterparties is subject to continual review by management, and the Company believes all of these institutions currently are acceptable credit risks. Full performance is anticipated, and the Company has no past due receivables from any of these counterparties. It is the Company's policy to enter into derivative contracts with counterparties that are lenders in the Amended Credit Facility or affiliates of lenders in the Amended Credit Facility. The Company's derivative contracts are documented using an industry standard contract known as a Schedule to the Master Agreement and International Swaps and Derivative Association, Inc. ("ISDA") Master Agreement or other contracts. Typical terms for these contracts include credit support requirements, cross default provisions, termination events and set-off provisions. The Company is not required to provide any credit support to its counterparties other than cross collateralization with the properties securing the Amended Credit Facility. The Company has set-off provisions in its derivative contracts with lenders under its Amended Credit Facility which, in the event of a counterparty default, allow the Company to set-off amounts owed to the defaulting counterparty under the Amended Credit Facility or other obligations against monies owed to the Company under the derivative contracts. Where the counterparty is not a lender under the Company's Amended Credit Facility, it may not be able to set-off amounts owed by the Company under the Amended Credit Facility, even if such counterparty is an affiliate of a lender under such facility. The Company does not have any derivative balances that are offset by cash collateral.

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2016
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company accounts for uncertainty in income taxes for tax positions taken or expected to be taken in a tax return in accordance with the FASB’s rules on income taxes. The Company recognizes the tax benefit from an uncertain tax position only if it is more likely than not that the tax position will be sustained upon examination by the taxing authorities. During the three months ended March 31, 2016 , the Company had no uncertain tax positions. The Company’s policy is to classify accrued penalties and interest related to unrecognized tax benefits in the Company’s income tax provision. The Company did not record any accrued interest or penalties associated with unrecognized tax benefits during the three months ended March 31, 2016 and 2015 . Income tax benefit for the three months ended March 31, 2016 and 2015 differs from the amounts that would be provided by applying the U.S. statutory income tax rates to pretax income or loss principally due to the effect of deferred tax asset valuation allowances, stock based compensation, political lobbying expense, political contributions, nondeductible officer compensation and state income taxes. For the three months ended March 31, 2016 , the effective tax rate remains at zero as a result of recording a full valuation allowance against our deferred tax asset balance. The Company considers all available evidence (both positive and negative) to estimate whether sufficient future taxable income will be generated to permit the use of the existing deferred tax assets. Such evidence includes the scheduled reversal of deferred tax liabilities, projected future taxable income and tax planning strategies in making this assessment, and judgment is required in considering the relative weight of negative and positive evidence. The Company continues to monitor facts and circumstances in the reassessment of the likelihood that operating loss carryforwards, credits and other deferred tax assets will be utilized prior to their expiration.

Equity Incentive Compensation P

Equity Incentive Compensation Plans and Other Long-term Incentive Programs	3 Months Ended
	Mar. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Equity Incentive Compensation Plans and Other Long-term Incentive Programs	Equity Incentive Compensation Plans and Other Long-term Incentive Programs The Company maintains various stock-based compensation plans and other employee benefits as discussed below. Stock-based compensation is measured at the grant date based on the value of the awards, and the fair value is recognized on a straight-line basis over the requisite service period (usually the vesting period). Cash-based compensation is measured at fair value at each reporting date and is recognized on a straight-line basis over the requisite service period (usually the vesting period). The following table presents the long-term cash and equity incentive compensation related to awards for the periods indicated: Three Months Ended March 31, 2016 2015 (in thousands) Common stock options (1) $ 69 $ 242 Nonvested common stock (1) 2,404 1,574 Nonvested common stock units (1) 290 261 Nonvested performance-based shares (1) 678 430 Nonvested performance cash units (2) 485 251 Total $ 3,926 $ 2,758 (1) Unrecognized compensation cost as of March 31, 2016 was $9.8 million related to grants of nonvested stock options and nonvested shares of common stock that are expected to be recognized over a weighted-average period of 2.1 years . (2) The nonvested performance-based cash units are liability awards with $0.9 million and $0.4 million in derivatives and other noncurrent liabilities in the Unaudited Consolidated Balance Sheets as of March 31, 2016 and December 31, 2015 , respectively. Nonvested Equity and Cash Awards. The following table presents the equity and cash awards granted pursuant to the Company's various stock compensation plans: Three Months Ended March 31, 2016 Three Months Ended March 31, 2015 Equity Awards Number of Weighted Average Number of Weighted Average Nonvested common stock 686,500 $ 5.11 622,609 $ 12.30 Nonvested common stock units 3,014 $ 6.22 2,259 $ 8.30 Nonvested performance-based shares — $ — — $ — Total granted 689,514 624,868 Three Months Ended March 31, 2016 Three Months Ended March 31, 2015 Cash Awards Number of Fair Value Per Unit Number of Fair Value Per Unit Nonvested performance cash units 646,572 $ 6.22 405,836 $ 12.31 Performance Cash Program 2016 Program. In March 2016, the Compensation Committee approved a performance cash program (the "2016 Program") granting performance cash units that will settle in cash. The performance-based awards contingently vest in February 2019, depending on the level at which the performance goal is achieved. The performance goal, which will be measured over the three year period ending December 31, 2018, will be the Company's total shareholder return ("TSR") based on a matrix measurement of the Company's absolute performance and ranking relative to a defined peer group's individual TSRs ("Relative TSR"). The Company's absolute performance is measured against the December 31, 2015 closing share price of $3.93 and if the Company's absolute performance is lower than the $3.93 share price, the payout is zero . If the Company's absolute performance is greater than the $3.93 share price, then the performance cash units will vest depending on the compound annual growth rate of the Company's absolute performance and the Relative TSR up to 200% of the original grant.

Equity Distribution Agreement

Equity Distribution Agreement	3 Months Ended
	Mar. 31, 2016
Equity Distribution Agreement [Abstract]
Equity Distribution Agreement	Equity Distribution Agreement On June 10, 2015, the Company entered into an Equity Distribution Agreement (the "Agreement") with Goldman, Sachs and Co. (the "Manager"). Pursuant to the terms of the Agreement, the Company may sell, from time to time through or to the Manager, shares of its common stock having an aggregate gross sales price of up to $100.0 million . Sales of the shares, if any, will be made by means of ordinary brokers' transactions through the facilities of the New York Stock Exchange, at market prices, in block transactions, to or through a market maker, through an electronic communications network or as otherwise agreed by the Company and the Manager. As of March 31, 2016 , no shares have been sold pursuant to the Agreement.

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Lease Financing Obligation. The Company has a Lease Financing Obligation with Bank of America Leasing & Capital, LLC as the lead bank as discussed in Note 5 . The aggregate undiscounted minimum future lease payments, including both principal and interest components, are presented below: As of March 31, 2016 (in thousands) 2016 $ 403 2017 537 2018 537 2019 1,825 2020 — Thereafter — Total $ 3,302 Transportation Charges . The Company is party to two firm transportation contracts to provide capacity on natural gas pipeline systems. The remaining term on these contracts is five years. The contracts require the Company to pay transportation charges regardless of the amount of pipeline capacity utilized by the Company. These monthly transportation payments are included in unused commitments expense in the Unaudited Consolidated Statements of Operations. As a result of previous divestitures in 2013 and 2014, the Company will likely not utilize the firm capacity on the natural gas pipelines. The amounts in the table below represent the Company's future minimum transportation charges: As of March 31, 2016 (in thousands) 2016 $ 13,774 2017 18,692 2018 18,692 2019 18,692 2020 18,692 Thereafter 10,902 Total $ 99,444 Lease and Other Commitments. The Company leases office space, vehicles and certain equipment under non-cancelable operating leases. Additionally, the Company has entered into various long-term agreements for telecommunication services as well as other drilling and throughput commitments. Future minimum annual payments under lease and other agreements are as follows: As of March 31, 2016 (in thousands) 2016 (1) $ 5,715 2017 2,882 2018 2,591 2019 633 2020 — Thereafter — Total $ 11,821 (1) Includes a contractual obligation of $3.2 million related to certain drilling commitments on sold properties. Litigation. The Company is subject to litigation, claims and governmental and regulatory proceedings arising in the ordinary course of business. It is the opinion of the Company's management that current claims and litigation involving the Company are not likely to have a material adverse effect on its Unaudited Consolidated Balance Sheet, Cash Flows or Statements of Operations.

Guarantor Subsidiaries

Guarantor Subsidiaries	3 Months Ended
	Mar. 31, 2016
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Guarantor Subsidiaries	Guarantor Subsidiaries In addition to the Amended Credit Facility, the 7.625% Senior Notes, 7.0% Senior Notes and Convertible Notes, which have been registered under the Securities Act of 1933, are jointly and severally guaranteed on a full and unconditional basis by the Company's 100% owned subsidiaries ("Guarantor Subsidiaries"). Presented below are the Company's condensed consolidating balance sheets, statements of operations, statements of other comprehensive income (loss) and statements of cash flows, as required by Securities and Exchange Commission ("SEC") Rule 3-10 of Regulation S-X. The following unaudited condensed consolidating financial statements have been prepared from the Company's financial information on the same basis of accounting as the Unaudited Consolidated Financial Statements. Investments in the subsidiaries are accounted for under the equity method. Accordingly, the entries necessary to consolidate the Company and the Guarantor Subsidiaries are reflected in the intercompany eliminations column. Condensed Consolidating Balance Sheets As of March 31, 2016 Parent Guarantor Intercompany Consolidated (in thousands) Assets: Current assets $ 253,100 $ 263 $ — $ 253,363 Property and equipment, net 1,135,183 6,446 — 1,141,629 Intercompany receivable (payable) 21,316 (21,316 ) — — Investment in subsidiaries (14,660 ) — 14,660 — Noncurrent assets 49,218 — — 49,218 Total assets $ 1,444,157 $ (14,607 ) $ 14,660 $ 1,444,210 Liabilities and Stockholders' Equity: Current liabilities $ 129,530 $ 53 $ — $ 129,583 Long-term debt 794,972 — — 794,972 Other noncurrent liabilities 13,678 — — 13,678 Stockholders' equity 505,977 (14,660 ) 14,660 505,977 Total liabilities and stockholders' equity $ 1,444,157 $ (14,607 ) $ 14,660 $ 1,444,210 As of December 31, 2015 Parent Guarantor Intercompany Consolidated (in thousands) Assets: Current assets $ 274,115 $ 202 $ — $ 274,317 Property and equipment, net 1,164,086 6,598 — 1,170,684 Intercompany receivable (payable) 21,412 (21,412 ) — — Investment in subsidiaries (14,664 ) — 14,664 — Noncurrent assets 61,519 — — 61,519 Total assets $ 1,506,468 $ (14,612 ) $ 14,664 $ 1,506,520 Liabilities and Stockholders' Equity: Current liabilities $ 145,231 $ — $ — $ 145,231 Long-term debt 794,652 — — 794,652 Other noncurrent liabilities 17,169 52 — 17,221 Stockholders' equity 549,416 (14,664 ) 14,664 549,416 Total liabilities and stockholders' equity $ 1,506,468 $ (14,612 ) $ 14,664 $ 1,506,520 Condensed Consolidating Statements of Operations Three Months Ended March 31, 2016 Parent Guarantor Intercompany Consolidated (in thousands) Operating and other revenues $ 29,266 $ 168 $ — $ 29,434 Operating expenses (56,305 ) (164 ) — (56,469 ) General and administrative (12,420 ) — — (12,420 ) Interest income and other income (expense) (7,041 ) — — (7,041 ) Income (loss) before income taxes and equity in earnings of subsidiaries (46,500 ) 4 — (46,496 ) (Provision for) Benefit from income taxes — — — — Equity in earnings (loss) of subsidiaries 4 — (4 ) — Net income (loss) $ (46,496 ) $ 4 $ (4 ) $ (46,496 ) Three Months Ended March 31, 2015 Parent Guarantor Intercompany Consolidated (in thousands) Operating and other revenues $ 48,896 $ 138 $ — $ 49,034 Operating expenses (74,998 ) (161 ) — (75,159 ) General and administrative (13,329 ) — — (13,329 ) Interest and other income (expense) 20,850 — — 20,850 Income (loss) before income taxes and equity in earnings of subsidiaries (18,581 ) (23 ) — (18,604 ) (Provision for) Benefit from income taxes 6,873 — — 6,873 Equity in earnings (loss) of subsidiaries (23 ) — 23 — Net income (loss) $ (11,731 ) $ (23 ) $ 23 $ (11,731 ) Condensed Consolidating Statements of Comprehensive Income (Loss) Three Months Ended March 31, 2016 Parent Issuer Guarantor Subsidiaries Intercompany Eliminations Consolidated (in thousands) Net income (loss) $ (46,496 ) $ 4 $ (4 ) $ (46,496 ) Other comprehensive income (loss) — — — — Comprehensive income (loss) $ (46,496 ) $ 4 $ (4 ) $ (46,496 ) Three Months Ended March 31, 2015 Parent Issuer Guarantor Subsidiaries Intercompany Eliminations Consolidated (in thousands) Net income (loss) $ (11,731 ) $ (23 ) $ 23 $ (11,731 ) Other comprehensive income (loss) — — — — Comprehensive income (loss) $ (11,731 ) $ (23 ) $ 23 $ (11,731 ) Condensed Consolidating Statements of Cash Flows Three Months Ended March 31, 2016 Parent Issuer Guarantor Subsidiaries Intercompany Eliminations Consolidated (in thousands) Cash flows from operating activities $ 40,419 $ 96 $ — $ 40,515 Cash flows from investing activities: Additions to oil and gas properties, including acquisitions (61,261 ) — — (61,261 ) Additions to furniture, fixtures and other (782 ) — — (782 ) Proceeds from sale of properties and other investing activities (1,238 ) — — (1,238 ) Intercompany transfers 96 — (96 ) — Cash flows from financing activities: Principal payments on debt (109 ) — — (109 ) Intercompany transfers — (96 ) 96 — Other financing activities (398 ) — — (398 ) Change in cash and cash equivalents (23,273 ) — — (23,273 ) Beginning cash and cash equivalents 128,836 — — 128,836 Ending cash and cash equivalents $ 105,563 $ — $ — $ 105,563 Three Months Ended March 31, 2015 Parent Issuer Guarantor Subsidiaries Intercompany Eliminations Consolidated (in thousands) Cash flows from operating activities $ 53,788 $ 37 $ — $ 53,825 Cash flows from investing activities: Additions to oil and gas properties, including acquisitions (112,105 ) 1,096 — (111,009 ) Additions to furniture, fixtures and other (609 ) — — (609 ) Proceeds from sale of properties and other investing activities 66,415 — — 66,415 Cash paid for short-term investments (114,883 ) — — (114,883 ) Intercompany transfers 1,133 (1,133 ) — Cash flows from financing activities: Principal payments on debt (24,871 ) — — (24,871 ) Intercompany transfers — (1,133 ) 1,133 — Other financing activities (1,000 ) — — (1,000 ) Change in cash and cash equivalents (132,132 ) — — (132,132 ) Beginning cash and cash equivalents 165,904 — — 165,904 Ending cash and cash equivalents $ 33,772 $ — $ — $ 33,772

Subsequent Events

Subsequent Events	3 Months Ended
	Mar. 31, 2016
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On April 28, 2016, the Company entered into a purchase and sale agreement for the sale of certain non-core assets in the Uinta Basin. Total gross consideration, prior to customary closing adjustments, was $33.7 million , including cash proceeds of $28.9 million and $4.8 million related to the relief of asset retirement obligations. The transaction is expected to close during the three months ended June 30, 2016. The related assets and liabilities were classified as held for sale in the Unaudited Consolidated Balance Sheet as of March 31, 2016.

Summary of Significant Accoun22

Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2016
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation. The accompanying Unaudited Consolidated Financial Statements include the accounts of the Company. These statements have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP"). All intercompany accounts and transactions have been eliminated in consolidation. In the opinion of management, the accompanying financial statements include all adjustments (consisting of normal recurring accruals and adjustments) necessary to present fairly, in all material respects, the Company's interim results. However, operating results for the periods presented are not necessarily indicative of the results that may be expected for the full year. The Company's Annual Report on Form 10-K includes certain definitions and a summary of significant accounting policies and should be read in conjunction with this Quarterly Report on Form 10-Q. Except as disclosed herein, there have been no material changes to the information disclosed in the notes to the consolidated financial statements included in the Company's 2015 Annual Report on Form 10-K.
Use of Estimates	Use of Estimates. In the course of preparing the Company's financial statements in accordance with GAAP, management makes various assumptions, judgments and estimates to determine the reported amount of assets, liabilities, revenues and expenses and in the disclosure of commitments and contingencies. Changes in these assumptions, judgments and estimates will occur as a result of the passage of time and the occurrence of future events and, accordingly, actual results could differ from amounts initially established. Areas requiring the use of assumptions, judgments and estimates relate to volumes of oil, natural gas and NGL reserves used in calculating depreciation, depletion and amortization ("DD&A"), the amount of expected future cash flows used in determining possible impairments of proved oil and gas properties and the amount of future capital costs used in these calculations. Assumptions, judgments and estimates also are required in determining asset retirement obligations, the timing of dry hole costs, impairments of unproved oil and gas properties, valuing deferred tax assets and estimating fair values of derivative instruments and stock-based payment awards.
Oil and Gas Properties	Oil and Gas Properties. The Company's oil, gas and NGL exploration and production activities are accounted for using the successful efforts method. Under this method, all property acquisition costs and costs of exploratory and development wells are capitalized when incurred, pending determination of whether the well has found proved reserves. If an exploratory well does not find proved reserves, the costs of drilling the well are charged to expense and remain within cash flows from investing activities in the Unaudited Consolidated Statements of Cash Flows. If an exploratory well does find proved reserves, the costs remain capitalized and are included within additions to oil and gas properties and remain within cash flows from investing activities in the Unaudited Consolidated Statements of Cash Flows. The costs of development wells are capitalized whether proved reserves are added or not. Oil and gas lease acquisition costs are also capitalized. Upon sale or retirement of depreciable or depletable property, the cost and related accumulated DD&A are eliminated from the accounts and the resulting gain or loss is recognized. Other exploration costs, including certain geological and geophysical expenses and delay rentals for oil and gas leases, are charged to expense as incurred. The sale of a partial interest in a proved property is accounted for as a cost recovery and no gain or loss is recognized as long as this treatment does not significantly affect the unit-of-production amortization rate. Maintenance and repairs are charged to expense, and renewals and betterments are capitalized to the appropriate property and equipment accounts. Unproved oil and gas property costs are transferred to proved oil and gas properties if the properties are subsequently determined to be productive or are assigned proved reserves. Proceeds from sales of partial interests in unproved leases are accounted for as a recovery of cost without recognizing any gain until all costs are recovered. Unproved oil and gas properties are assessed periodically for impairment based on remaining lease terms, drilling results, reservoir performance, commodity price outlooks, future plans to develop acreage and other relevant matters. Materials and supplies consist primarily of tubular goods and well equipment to be used in future drilling operations or repair operations and are carried at the lower of cost or market value, on a first-in, first-out basis. The following table sets forth the net capitalized costs and associated accumulated DD&A and non-cash impairments relating to the Company's oil, natural gas and NGL producing activities: As of March 31, 2016 As of December 31, 2015 (in thousands) Proved properties $ 300,444 $ 320,538 Wells and related equipment and facilities 1,064,556 1,592,716 Support equipment and facilities 56,149 77,785 Materials and supplies 5,836 9,171 Total proved oil and gas properties (1) $ 1,426,985 $ 2,000,210 Unproved properties 31,554 33,336 Wells and facilities in progress 89,900 45,862 Total unproved oil and gas properties, excluded from amortization (1) $ 121,454 $ 79,198 Accumulated depreciation, depletion, amortization and impairment (1) (416,336 ) (918,510 ) Total oil and gas properties, net (1) $ 1,132,103 $ 1,160,898 (1) Excludes oil and gas properties held for sale of $33.7 million , comprised of $572.2 million of proved oil and gas properties and $4.3 million of unproved oil and gas properties, net of accumulated depreciation, depletion, amortization and impairment of $542.8 million . Held for sale balances are included in current assets as assets held for sale, net of amortization and impairment, in the Unaudited Consolidated Balance Sheet as of March 31, 2016. See Note 4 for additional information on assets held for sale. The Company reviews proved oil and gas properties on a field-by-field basis for impairment on a quarterly basis or whenever events and circumstances indicate that a decline in the recoverability of their carrying value may have occurred. The Company estimates the expected undiscounted future net cash flows of its oil and gas properties based on the Company's best estimate of development plans, future production, commodity pricing, gathering and transportation deductions, production tax rates, lease operating expenses and future development costs. The Company compares such undiscounted future net cash flows to the carrying amount of the oil and gas properties to determine if the carrying amount is recoverable. If the undiscounted future net cash flows exceed the carrying amount of the proved oil and gas properties, no impairment is taken. If the carrying value of a property exceeds the undiscounted future net cash flows, the Company will impair the carrying value to fair value based on an analysis of quantitative and qualitative factors existing as of the balance sheet date. The Company does not believe that the undiscounted future net cash flows analysis of its proved property represents the applicable market value. The factors used to determine fair value include, but are not limited to, recent sales prices of comparable properties, indications from marketing activities, the present value of future revenues, net of estimated operating and development costs using estimates of reserves, future commodity pricing, future production estimates, anticipated capital expenditures and various discount rates commensurate with the risk and current market conditions associated with realizing the projected cash flows. Oil and gas properties are assessed for impairment once they meet the criteria to be classified as held for sale. Assets held for sale are carried at the lower of carrying cost or fair value less costs to sell. The fair value of the assets is determined using a market approach, based on an estimated selling price, as evidenced by current marketing activities, if possible. If an estimated selling price is not available, the Company utilizes the income valuation technique which involves calculating the present value of future revenues, as discussed above. If the carrying amount of the assets exceeds the fair value less costs to sell, an impairment will result to reduce the value of the properties down to fair value less costs to sell. The Company recognized non-cash impairment, dry hole costs and abandonment expense in the Unaudited Consolidated Statements of Operations, as follows: Three Months Ended March 31, 2016 2015 (in thousands) Non-cash impairment of proved oil and gas properties $ — $ — Non-cash impairment of unproved oil and gas properties 183 58 Dry hole costs 57 15 Abandonment expense and lease expirations 318 1,182 Total non-cash impairment, dry hole costs and abandonment expense $ 558 $ 1,255 The provision for DD&A of oil and gas properties is calculated on a field-by-field basis using the unit-of-production method. Natural gas and NGLs are converted to an oil equivalent, Boe, at the standard rate of six Mcf to one Boe and forty-two gallons to one Boe, respectively. Estimated future dismantlement, restoration and abandonment costs are taken into consideration by this calculation.
Accounts Payable and Accrued Liabilities	Accounts Payable and Accrued Liabilities. Accounts payable and accrued liabilities are comprised of the following: As of March 31, 2016 As of December 31, 2015 (in thousands) Accrued drilling, completion and facility costs $ 16,296 $ 32,895 Accrued lease operating, gathering, transportation and processing expenses 5,031 4,930 Accrued general and administrative expenses 5,282 10,962 Accrued interest payable 28,545 13,918 Trade payables and other 4,017 1,632 Total accounts payable and accrued liabilities $ 59,171 $ 64,337
Environmental Liabilities	Environmental Liabilities. Environmental expenditures that relate to an existing condition caused by past operations and that do not contribute to current or future revenue generation are expensed. Environmental liabilities are accrued when environmental assessments and/or clean-ups are probable, and the costs can be reasonably estimated.
Revenue Recognition	Revenue Recognition. Oil, gas and NGL revenues are recognized when production is sold to a purchaser at a fixed or determinable price, when delivery has occurred and title has transferred, and collectability of the revenue is reasonably assured. The Company uses the sales method to account for gas and NGL imbalances. Under this method, revenues are recorded on the basis of gas and NGLs actually sold by the Company. In addition, the Company records revenues for its share of gas and NGLs sold by other owners that cannot be volumetrically balanced in the future due to insufficient remaining reserves. The Company also reduces revenues for other owners' volumetric share of gas and NGLs sold by the Company that cannot be volumetrically balanced in the future due to insufficient remaining reserves. The Company's remaining over- and under-produced gas and NGLs balancing positions are taken into account in determining the Company's proved oil, gas and NGL reserves. Imbalances at March 31, 2016 and 2015 were not material.
Derivative Instruments and Hedging Activities	Derivative Instruments and Hedging Activities. The Company periodically uses derivative financial instruments to achieve a more predictable cash flow from its oil, natural gas and NGL sales by reducing its exposure to price fluctuations. Derivative instruments are recorded at fair market value and are included in the Unaudited Consolidated Balance Sheets as assets or liabilities and in the Unaudited Consolidated Statements of Operations as commodity derivative gain (loss).
Income Taxes	Income Taxes. Income taxes are provided for the tax effects of transactions reported in the financial statements and consist of taxes currently payable plus deferred income taxes related to certain income and expenses recognized in different periods for financial and income tax reporting purposes. Deferred income tax assets and liabilities represent the future tax return consequences of those differences, which will either be taxable or deductible when assets are recovered or liabilities are settled. Deferred income taxes also include tax credits and net operating losses that are available to offset future income taxes. Deferred income taxes are measured by applying currently enacted tax rates. Deferred tax assets are regularly reviewed, considering all positive and negative evidence, including scheduled reversals of deferred tax liabilities, projected future taxable income, taxable strategies and results of recent operations. The assumptions about future taxable income require significant judgment to determine whether it is more likely than not that the deferred tax asset will be realized. The Company accounts for uncertainty in income taxes for tax positions taken or expected to be taken in a tax return. Only tax positions that meet the more-likely-than-not recognition threshold are recognized. The Company does not have any uncertain tax positions recorded as of March 31, 2016 .
Earnings/Loss Per Share	Earnings/Loss Per Share. Basic net income (loss) per common share is calculated by dividing net income (loss) attributable to common stock by the weighted average number of common shares outstanding during each period. Diluted net income per common share is calculated by dividing net income attributable to common stock by the weighted average number of common shares outstanding and other dilutive securities. Potentially dilutive securities for the diluted net income per common share calculations consist of nonvested equity shares of common stock, in-the-money outstanding stock options to purchase the Company's common stock and shares into which the Convertible Notes are convertible. No potential common shares are included in the computation of any diluted per share amount when a net loss exists, as was the case for the three months ended March 31, 2016 and 2015 . The following table sets forth the calculation of basic and diluted income (loss) per share: Three Months Ended March 31, 2016 2015 (in thousands, except per share amounts) Net income (loss) $ (46,496 ) $ (11,731 ) Basic weighted-average common shares outstanding in period 48,499 48,199 Diluted weighted-average common shares outstanding in period 48,499 48,199 Basic net income (loss) per common share $ (0.96 ) $ (0.24 ) Diluted net income (loss) per common share $ (0.96 ) $ (0.24 )
New Accounting Pronouncements	New Accounting Pronouncements. In March 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2016-09, Improvements to Employee Share-Based Payment Accounting . The objective of this update is to simplify the current guidance for stock compensation. The areas for simplification involve several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities and classification on the statement of cash flows. ASU 2016-09 is effective for the annual periods beginning after December 15, 2016, and interim periods within those annual periods. The Company is currently evaluating the impact of adopting this standard. In February 2016, the FASB issued ASU 2016-02, Leases . The objective of this update is to increase transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. ASU 2016-02 is effective for the annual periods beginning after December 15, 2018, and interim periods within those annual periods. The Company is currently evaluating the impact of adopting this standard. In November 2015, the FASB issued ASU 2015-17, Balance Sheet Classification of Deferred Taxes . The objective of this update is to require deferred tax liabilities and assets be classified as noncurrent in a classified statement of financial position. ASU 2015-17 is effective for the annual periods beginning after December 15, 2016, and interim periods within those annual periods. The standard will be adopted retrospectively and will not have a significant impact on the Company's disclosures and financial statements. In April 2015, the FASB issued ASU 2015-03, Simplifying the Presentation of Debt Issuance Costs . The objective of this update is to require that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct reduction from the carrying amount of that debt liability, consistent with debt discounts. In August 2015, the FASB issued ASU 2015-15, Presentation and Subsequent Measurement of Debt Issuance Costs Associated with Line-of-Credit Arrangements . This ASU amends ASU 2015-03 which had not addressed the balance sheet presentation of debt issuance costs incurred in connection with line-of-credit arrangements. Under ASU 2015-15, a Company may defer debt issuance costs associated with line-of-credit arrangements and present such costs as an asset, subsequently amortizing the deferred debt issuance costs ratably over the term of the line-of-credit arrangement, regardless of whether there are any outstanding borrowings. ASU 2015-03 and ASU 2015-15 are effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015, should be applied retrospectively and represent a change in accounting principle. The Company adopted ASU 2015-03 and ASU 2015-15 as of March 31, 2016, and as a result, $8.7 million of debt issuance costs related to the Company’s senior notes and convertible senior notes was reclassified from deferred financing costs and other noncurrent assets to long-term debt in the Company’s consolidated balance sheets as of December 31, 2015. The Company elected to continue presenting the debt issuance costs associated with its credit facility within deferred financing costs and other noncurrent assets in the consolidated balance sheets. In August 2014, the FASB issued ASU 2014-15, Disclosure of Uncertainties about an Entity's Ability to Continue as a Going Concern. The objective of this update is to provide guidance in GAAP about management's responsibility to evaluate whether there is substantial doubt about an entity's ability to continue as a going concern and to provide related footnote disclosures. ASU 2014-15 is effective for the annual period ending after December 15, 2016, and for annual periods and interim periods thereafter. The standard will be adopted prospectively. In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers. The objective of this update is to clarify the principles for recognizing revenue and to develop a common revenue standard. ASU 2015-14 deferred the effective reporting periods of ASU 2014-09, and it is now effective for annual reporting periods beginning after December 15, 2017, including interim periods within that reporting period. The Company is currently evaluating the impact of adopting this standard.

Summary of Significant Accoun23

Summary of Significant Accounting Policies (Tables)	3 Months Ended
	Mar. 31, 2016
Accounting Policies [Abstract]
Summary of Accounts Receivable	Accounts receivable is comprised of the following: As of March 31, 2016 As of December 31, 2015 (in thousands) Accrued oil, gas and NGL sales $ 22,775 $ 33,594 Due from joint interest owners 6,434 8,373 Other 1,839 1,508 Allowance for doubtful accounts — (14 ) Total accounts receivable $ 31,048 $ 43,461
Net Capitalized Costs and Associated Accumulated DD&A and Non Cash Impairments	The following table sets forth the net capitalized costs and associated accumulated DD&A and non-cash impairments relating to the Company's oil, natural gas and NGL producing activities: As of March 31, 2016 As of December 31, 2015 (in thousands) Proved properties $ 300,444 $ 320,538 Wells and related equipment and facilities 1,064,556 1,592,716 Support equipment and facilities 56,149 77,785 Materials and supplies 5,836 9,171 Total proved oil and gas properties (1) $ 1,426,985 $ 2,000,210 Unproved properties 31,554 33,336 Wells and facilities in progress 89,900 45,862 Total unproved oil and gas properties, excluded from amortization (1) $ 121,454 $ 79,198 Accumulated depreciation, depletion, amortization and impairment (1) (416,336 ) (918,510 ) Total oil and gas properties, net (1) $ 1,132,103 $ 1,160,898 (1) Excludes oil and gas properties held for sale of $33.7 million , comprised of $572.2 million of proved oil and gas properties and $4.3 million of unproved oil and gas properties, net of accumulated depreciation, depletion, amortization and impairment of $542.8 million . Held for sale balances are included in current assets as assets held for sale, net of amortization and impairment, in the Unaudited Consolidated Balance Sheet as of March 31, 2016. See Note 4 for additional information on assets held for sale.
Non-Cash Impairment Charges, Included within Impairment, Dry Hole Costs and Abandonment Expense in Consolidated Statements of Operations	The Company recognized non-cash impairment, dry hole costs and abandonment expense in the Unaudited Consolidated Statements of Operations, as follows: Three Months Ended March 31, 2016 2015 (in thousands) Non-cash impairment of proved oil and gas properties $ — $ — Non-cash impairment of unproved oil and gas properties 183 58 Dry hole costs 57 15 Abandonment expense and lease expirations 318 1,182 Total non-cash impairment, dry hole costs and abandonment expense $ 558 $ 1,255
Accounts Payable and Accrued Liabilities	Accounts payable and accrued liabilities are comprised of the following: As of March 31, 2016 As of December 31, 2015 (in thousands) Accrued drilling, completion and facility costs $ 16,296 $ 32,895 Accrued lease operating, gathering, transportation and processing expenses 5,031 4,930 Accrued general and administrative expenses 5,282 10,962 Accrued interest payable 28,545 13,918 Trade payables and other 4,017 1,632 Total accounts payable and accrued liabilities $ 59,171 $ 64,337
Calculation of Basic and Diluted Earnings (Loss) Per Share	The following table sets forth the calculation of basic and diluted income (loss) per share: Three Months Ended March 31, 2016 2015 (in thousands, except per share amounts) Net income (loss) $ (46,496 ) $ (11,731 ) Basic weighted-average common shares outstanding in period 48,499 48,199 Diluted weighted-average common shares outstanding in period 48,499 48,199 Basic net income (loss) per common share $ (0.96 ) $ (0.24 ) Diluted net income (loss) per common share $ (0.96 ) $ (0.24 )

Supplemental Disclosures of C24

Supplemental Disclosures of Cash Flow Information (Tables)	3 Months Ended
	Mar. 31, 2016
Supplemental Cash Flow Elements [Abstract]
Supplemental Cash Flow Information	Supplemental cash flow information is as follows: Three Months Ended March 31, 2016 2015 (in thousands) Cash paid for interest $ 480 $ 1,105 Cash paid for income taxes — 1,050 Supplemental disclosures of non-cash investing and financing activities: Accrued liabilities - oil and gas properties 17,518 74,984 Change in asset retirement obligations, net of disposals (60 ) (525 ) Retirement of treasury stock (384 ) (975 )

Long-Term Debt (Tables)

Long-Term Debt (Tables)	3 Months Ended
	Mar. 31, 2016
Debt Disclosure [Abstract]
Outstanding Debt	The Company's outstanding debt is summarized below: As of March 31, 2016 As of December 31, 2015 Maturity Date Principal Debt Issuance Costs Carrying Amount Principal Debt Issuance Costs Carrying Amount (in thousands) Amended Credit Facility April 9, 2020 $ — $ — $ — $ — $ — $ — Convertible Notes (1)(2) March 15, 2028 579 — 579 579 — 579 7.625% Senior Notes (3) October 1, 2019 400,000 (3,502 ) 396,498 400,000 (3,752 ) 396,248 7.0% Senior Notes (4) October 15, 2022 400,000 (4,771 ) 395,229 400,000 (4,953 ) 395,047 Lease Financing Obligation (5) August 10, 2020 3,113 (4 ) 3,109 3,222 (4 ) 3,218 Total Debt $ 803,692 $ (8,277 ) $ 795,415 $ 803,801 $ (8,709 ) $ 795,092 Less: Current Portion of Long-Term Debt (6) 443 — 443 440 — 440 Total Long-Term Debt $ 803,249 $ (8,277 ) $ 794,972 $ 803,361 $ (8,709 ) $ 794,652 (1) The aggregate estimated fair value of the Convertible Notes was approximately $0.5 million as of March 31, 2016 and December 31, 2015 based on reported market trades of these instruments. (2) The Company has the right at any time, with at least 30 days' notice, to call the remaining Convertible Notes, and the holders have the right to require the Company to purchase the notes on each of March 20, 2018 and March 20, 2023. (3) The aggregate estimated fair value of the 7.625% Senior Notes was approximately $270.0 million and $270.2 million as of March 31, 2016 and December 31, 2015 , respectively, based on reported market trades of these instruments. (4) The aggregate estimated fair value of the 7.0% Senior Notes was approximately $242.0 million and $272.0 million as of March 31, 2016 and December 31, 2015 , respectively, based on reported market trades of these instruments. (5) The aggregate estimated fair value of the Lease Financing Obligation was approximately $3.0 million as of March 31, 2016 and $3.1 million as of December 31, 2015 . Because there is no active, public market for the Lease Financing Obligation, the aggregate estimated fair value was based on market-based parameters of comparable term secured financing instruments. (6) The current portion of the long-term debt as of March 31, 2016 and December 31, 2015 includes the current portion of the Lease Financing Obligation.
Cash and Non-Cash Portion of Interest Expense Related to Long Term Debt	The following table summarizes, for the periods indicated, the cash or accrued portion of interest expense related to the Amended Credit Facility, the outstanding Convertible Notes, the 7.625% Senior Notes, the 7.0% Senior Notes and the Lease Financing Obligation along with the non-cash portion resulting from the amortization of the debt discount and transaction costs through interest expense: Three Months Ended March 31, 2016 2015 (in thousands) Amended Credit Facility (1) Cash interest $ 438 $ 433 Non-cash interest $ 207 $ 586 Convertible Notes (2) Cash interest $ 22 $ 276 Non-cash interest $ — $ 3 7.625% Senior Notes (3) Cash interest $ 7,625 $ 7,625 Non-cash interest $ 250 $ 273 7.0% Senior Notes (4) Cash interest $ 7,000 $ 7,000 Non-cash interest $ 181 $ 204 Lease Financing Obligation (5) Cash interest $ 26 $ 29 Non-cash interest $ — $ — (1) Cash interest includes amounts related to interest and commitment fees incurred on the Amended Credit Facility and participation and fronting fees paid on the letter of credit. (2) The stated interest rate for the Convertible Notes is 5% per annum. The effective interest rate of the Convertible Notes includes amortization of the debt discount, which represented the fair value of the equity conversion feature at the time of issue. The stated interest rate of 5% on the Convertible Notes will be the effective interest rate of the $0.6 million remaining principal balance, as the related debt discount was fully amortized as of March 31, 2012. (3) The stated interest rate for the 7.625% Senior Notes is 7.625% per annum with an effective interest rate of 8.0% per annum. (4) The stated interest rate for the 7.0% Senior Notes is 7.0% per annum with an effective interest rate of 7.2% per annum. (5) The effective interest rate for the Lease Financing Obligation is 3.3% per annum.

Asset Retirement Obligations (T

Asset Retirement Obligations (Tables)	3 Months Ended
	Mar. 31, 2016
Asset Retirement Obligation Disclosure [Abstract]
Schedule of Asset Retirement Obligations	A reconciliation of the Company's asset retirement obligations for the three months ended March 31, 2016 is as follows (in thousands): As of December 31, 2015 $ 15,176 Liabilities incurred — Liabilities settled (8 ) Disposition of properties (52 ) Accretion expense 274 Revisions to estimate — As of March 31, 2016 $ 15,390 Less: liabilities associated with assets held for sale 4,785 Less: current asset retirement obligations 502 Long-term asset retirement obligations $ 10,103

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2016
Fair Value Disclosures [Abstract]
Fair Value, Balance Sheet Grouping	The following tables set forth by level within the fair value hierarchy the Company's assets and liabilities that were measured at fair value in the Unaudited Consolidated Balance Sheets. As of March 31, 2016 Level 1 Level 2 Level 3 Total (in thousands) Assets Cash equivalents (1) $ 60,095 $ — $ — $ 60,095 Deferred compensation plan (1) 1,208 — — 1,208 Commodity derivatives (1) — 95,184 — 95,184 Assets held for sale (2) — — 33,717 33,717 Liabilities Commodity derivatives (1) $ — $ 7 $ — $ 7 Liabilities associated with assets held for sale (2) — — 4,785 4,785 (1) This represents a financial asset or liability that is measured at fair value on a recurring basis. (2) This represents a non-financial asset or liability that is measured at fair value on a nonrecurring basis. As of December 31, 2015 Level 1 Level 2 Level 3 Total (in thousands) Assets Cash equivalents (1) $ 60,065 $ — $ — $ 60,065 Deferred compensation plan (1) 1,231 — — 1,231 Commodity derivatives (1) — 119,471 — 119,471 Proved oil and gas properties (2) — — 178,221 178,221 Unproved oil and gas properties (2) — — 5,539 5,539 (1) This represents a financial asset or liability that is measured at fair value on a recurring basis. (2) This represents a non-financial asset or liability that is measured at fair value on a nonrecurring basis.

Derivative Instruments (Tables)

Derivative Instruments (Tables)	3 Months Ended
	Mar. 31, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Fair Value Amounts of Derivative Instruments	The following table summarizes the location, as well as the gross and net fair value amounts of all derivative instruments presented in the Unaudited Consolidated Balance Sheets as of the dates indicated. As of March 31, 2016 Balance Sheet Gross Amounts of Recognized Assets Gross Amounts Offset in the Balance Sheet Net Amounts of Assets Presented in the Balance Sheet (in thousands) Derivative assets (current) $ 80,381 $ (7 ) (1) $ 80,374 Derivative assets (noncurrent) 14,803 — 14,803 Total derivative assets $ 95,184 $ (7 ) $ 95,177 Gross Amounts of Recognized Liabilities Gross Amounts Offset in the Balance Sheet Net Amounts of Liabilities Presented in the Balance Sheet (in thousands) Derivative liabilities $ (7 ) $ 7 (1) $ — Derivatives and other noncurrent liabilities — — — Total derivative liabilities $ (7 ) $ 7 $ — As of December 31, 2015 Balance Sheet Gross Amounts of Recognized Assets Gross Amounts Offset in the Balance Sheet Net Amounts of Assets Presented in the Balance Sheet (in thousands) Derivative assets (current) $ 99,809 $ — $ 99,809 Derivative assets (noncurrent) 19,662 — 19,662 Total derivative assets $ 119,471 $ — $ 119,471 (1) Asset and liability balances with the same counterparty are presented as a net asset or liability on the Unaudited Consolidated Balance Sheets.
Financial Instruments for Hedging Volumes	As of March 31, 2016 , the Company had financial derivative instruments in place related to the sale of a portion of the Company's production for the following volumes for the periods indicated: April – December 2016 For the year 2017 Derivative Weighted Average Price Derivative Volumes Weighted Average Price Oil (Bbls) 1,906,300 $ 78.25 683,250 $ 75.61 Natural Gas (MMbtu) 1,375,000 $ 4.10 — $ —

Equity Incentive Compensation29

Equity Incentive Compensation Plans and Other Long-term Incentive Programs (Tables)	3 Months Ended
	Mar. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Non-Cash Stock-Based Compensation Cost Related to Equity Awards	The following table presents the long-term cash and equity incentive compensation related to awards for the periods indicated: Three Months Ended March 31, 2016 2015 (in thousands) Common stock options (1) $ 69 $ 242 Nonvested common stock (1) 2,404 1,574 Nonvested common stock units (1) 290 261 Nonvested performance-based shares (1) 678 430 Nonvested performance cash units (2) 485 251 Total $ 3,926 $ 2,758 (1) Unrecognized compensation cost as of March 31, 2016 was $9.8 million related to grants of nonvested stock options and nonvested shares of common stock that are expected to be recognized over a weighted-average period of 2.1 years . (2) The nonvested performance-based cash units are liability awards with $0.9 million and $0.4 million in derivatives and other noncurrent liabilities in the Unaudited Consolidated Balance Sheets as of March 31, 2016 and December 31, 2015 , respectively.
Stock Options and Nonvested Equity Shares, Equity Awards Granted	The following table presents the equity and cash awards granted pursuant to the Company's various stock compensation plans: Three Months Ended March 31, 2016 Three Months Ended March 31, 2015 Equity Awards Number of Weighted Average Number of Weighted Average Nonvested common stock 686,500 $ 5.11 622,609 $ 12.30 Nonvested common stock units 3,014 $ 6.22 2,259 $ 8.30 Nonvested performance-based shares — $ — — $ — Total granted 689,514 624,868 Three Months Ended March 31, 2016 Three Months Ended March 31, 2015 Cash Awards Number of Fair Value Per Unit Number of Fair Value Per Unit Nonvested performance cash units 646,572 $ 6.22 405,836 $ 12.31

Commitments and Contingencies (

Commitments and Contingencies (Tables)	3 Months Ended
	Mar. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Schedule of Aggregate Undiscounted Minimum Future Lease Payments	The Company has a Lease Financing Obligation with Bank of America Leasing & Capital, LLC as the lead bank as discussed in Note 5 . The aggregate undiscounted minimum future lease payments, including both principal and interest components, are presented below: As of March 31, 2016 (in thousands) 2016 $ 403 2017 537 2018 537 2019 1,825 2020 — Thereafter — Total $ 3,302
Gross Future Minimum Transportation Demand and Firm Processing Charges	The amounts in the table below represent the Company's future minimum transportation charges: As of March 31, 2016 (in thousands) 2016 $ 13,774 2017 18,692 2018 18,692 2019 18,692 2020 18,692 Thereafter 10,902 Total $ 99,444
Future Minimum Annual Payments Under Drilling, Lease and Other Agreements	Future minimum annual payments under lease and other agreements are as follows: As of March 31, 2016 (in thousands) 2016 (1) $ 5,715 2017 2,882 2018 2,591 2019 633 2020 — Thereafter — Total $ 11,821 (1) Includes a contractual obligation of $3.2 million related to certain drilling commitments on sold properties.

Guarantor Subsidiaries (Tables)

Guarantor Subsidiaries (Tables)	3 Months Ended
	Mar. 31, 2016
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Schedule of Condensed Consolidating Balance Sheets	Condensed Consolidating Balance Sheets As of March 31, 2016 Parent Guarantor Intercompany Consolidated (in thousands) Assets: Current assets $ 253,100 $ 263 $ — $ 253,363 Property and equipment, net 1,135,183 6,446 — 1,141,629 Intercompany receivable (payable) 21,316 (21,316 ) — — Investment in subsidiaries (14,660 ) — 14,660 — Noncurrent assets 49,218 — — 49,218 Total assets $ 1,444,157 $ (14,607 ) $ 14,660 $ 1,444,210 Liabilities and Stockholders' Equity: Current liabilities $ 129,530 $ 53 $ — $ 129,583 Long-term debt 794,972 — — 794,972 Other noncurrent liabilities 13,678 — — 13,678 Stockholders' equity 505,977 (14,660 ) 14,660 505,977 Total liabilities and stockholders' equity $ 1,444,157 $ (14,607 ) $ 14,660 $ 1,444,210 As of December 31, 2015 Parent Guarantor Intercompany Consolidated (in thousands) Assets: Current assets $ 274,115 $ 202 $ — $ 274,317 Property and equipment, net 1,164,086 6,598 — 1,170,684 Intercompany receivable (payable) 21,412 (21,412 ) — — Investment in subsidiaries (14,664 ) — 14,664 — Noncurrent assets 61,519 — — 61,519 Total assets $ 1,506,468 $ (14,612 ) $ 14,664 $ 1,506,520 Liabilities and Stockholders' Equity: Current liabilities $ 145,231 $ — $ — $ 145,231 Long-term debt 794,652 — — 794,652 Other noncurrent liabilities 17,169 52 — 17,221 Stockholders' equity 549,416 (14,664 ) 14,664 549,416 Total liabilities and stockholders' equity $ 1,506,468 $ (14,612 ) $ 14,664 $ 1,506,520
Schedule of Condensed Consolidating Statements of Operations	Condensed Consolidating Statements of Operations Three Months Ended March 31, 2016 Parent Guarantor Intercompany Consolidated (in thousands) Operating and other revenues $ 29,266 $ 168 $ — $ 29,434 Operating expenses (56,305 ) (164 ) — (56,469 ) General and administrative (12,420 ) — — (12,420 ) Interest income and other income (expense) (7,041 ) — — (7,041 ) Income (loss) before income taxes and equity in earnings of subsidiaries (46,500 ) 4 — (46,496 ) (Provision for) Benefit from income taxes — — — — Equity in earnings (loss) of subsidiaries 4 — (4 ) — Net income (loss) $ (46,496 ) $ 4 $ (4 ) $ (46,496 ) Three Months Ended March 31, 2015 Parent Guarantor Intercompany Consolidated (in thousands) Operating and other revenues $ 48,896 $ 138 $ — $ 49,034 Operating expenses (74,998 ) (161 ) — (75,159 ) General and administrative (13,329 ) — — (13,329 ) Interest and other income (expense) 20,850 — — 20,850 Income (loss) before income taxes and equity in earnings of subsidiaries (18,581 ) (23 ) — (18,604 ) (Provision for) Benefit from income taxes 6,873 — — 6,873 Equity in earnings (loss) of subsidiaries (23 ) — 23 — Net income (loss) $ (11,731 ) $ (23 ) $ 23 $ (11,731 )
Schedule of Condensed Consolidating Statements of Comprehensive Income (Loss)	Condensed Consolidating Statements of Comprehensive Income (Loss) Three Months Ended March 31, 2016 Parent Issuer Guarantor Subsidiaries Intercompany Eliminations Consolidated (in thousands) Net income (loss) $ (46,496 ) $ 4 $ (4 ) $ (46,496 ) Other comprehensive income (loss) — — — — Comprehensive income (loss) $ (46,496 ) $ 4 $ (4 ) $ (46,496 ) Three Months Ended March 31, 2015 Parent Issuer Guarantor Subsidiaries Intercompany Eliminations Consolidated (in thousands) Net income (loss) $ (11,731 ) $ (23 ) $ 23 $ (11,731 ) Other comprehensive income (loss) — — — — Comprehensive income (loss) $ (11,731 ) $ (23 ) $ 23 $ (11,731 )
Schedule of Condensed Consolidating Statements of Cash Flows	Condensed Consolidating Statements of Cash Flows Three Months Ended March 31, 2016 Parent Issuer Guarantor Subsidiaries Intercompany Eliminations Consolidated (in thousands) Cash flows from operating activities $ 40,419 $ 96 $ — $ 40,515 Cash flows from investing activities: Additions to oil and gas properties, including acquisitions (61,261 ) — — (61,261 ) Additions to furniture, fixtures and other (782 ) — — (782 ) Proceeds from sale of properties and other investing activities (1,238 ) — — (1,238 ) Intercompany transfers 96 — (96 ) — Cash flows from financing activities: Principal payments on debt (109 ) — — (109 ) Intercompany transfers — (96 ) 96 — Other financing activities (398 ) — — (398 ) Change in cash and cash equivalents (23,273 ) — — (23,273 ) Beginning cash and cash equivalents 128,836 — — 128,836 Ending cash and cash equivalents $ 105,563 $ — $ — $ 105,563 Three Months Ended March 31, 2015 Parent Issuer Guarantor Subsidiaries Intercompany Eliminations Consolidated (in thousands) Cash flows from operating activities $ 53,788 $ 37 $ — $ 53,825 Cash flows from investing activities: Additions to oil and gas properties, including acquisitions (112,105 ) 1,096 — (111,009 ) Additions to furniture, fixtures and other (609 ) — — (609 ) Proceeds from sale of properties and other investing activities 66,415 — — 66,415 Cash paid for short-term investments (114,883 ) — — (114,883 ) Intercompany transfers 1,133 (1,133 ) — Cash flows from financing activities: Principal payments on debt (24,871 ) — — (24,871 ) Intercompany transfers — (1,133 ) 1,133 — Other financing activities (1,000 ) — — (1,000 ) Change in cash and cash equivalents (132,132 ) — — (132,132 ) Beginning cash and cash equivalents 165,904 — — 165,904 Ending cash and cash equivalents $ 33,772 $ — $ — $ 33,772

Summary of Significant Accoun32

Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Non-cash impairment of oil and gas properties			$ 572,400
Assets held for sale, net of amortization and impairment	$ 33,717		$ 0
Impairment of Assets Held For Sale, Long Lived, Fair Value Disclosure	(542,800)
Proved Oil And Gas Properties [Member]
Property, Plant and Equipment [Line Items]
Non-cash impairment of oil and gas properties	0	$ 0
Assets held for sale, net of amortization and impairment	572,200
Unproved Oil And Gas Properties [Member]
Property, Plant and Equipment [Line Items]
Non-cash impairment of oil and gas properties	183	$ 58
Assets held for sale, net of amortization and impairment	$ 4,300

Summary of Significant Accoun33

Summary of Significant Accounting Policies - Summary of Accounts Receivable (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for doubtful accounts	$ 0	$ (14)
Accounts receivable	31,048	43,461
Accrued Oil, Gas, and NGL Sales
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable gross	22,775	33,594
Due from Joint Interest Owners
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable gross	6,434	8,373
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable gross	$ 1,839	$ 1,508

Summary of Significant Accoun34

Summary of Significant Accounting Policies - Net Capitalized Costs and Associated Accumulated Depreciation, Depletion & Amortization and Non Cash Impairments (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Accounting Policies [Abstract]
Proved properties	$ 300,444	$ 320,538
Wells and related equipment and facilities	1,064,556	1,592,716
Support equipment and facilities	56,149	77,785
Materials and supplies	5,836	9,171
Total proved oil and gas properties (1)	1,426,985	2,000,210
Unproved properties	31,554	33,336
Wells and facilities in progress	89,900	45,862
Total unproved oil and gas properties, excluded from amortization (1)	121,454	79,198
Accumulated depreciation, depletion, amortization and impairment (1)	(416,336)	(918,510)
Total oil and gas properties, net (1)	$ 1,132,103	$ 1,160,898

Summary of Significant Accoun35

Summary of Significant Accounting Policies - Non-Cash Impairment Charges, Included within Impairment, Dry Hole Costs and Abandonment Expense in Consolidated Statements of Operations (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Summary Of Significant Accounting Policies [Line Items]
Non-cash impairment of oil and gas properties			$ 572,400
Dry hole costs	$ 57	$ 15
Abandonment expense and lease expirations	318	1,182
Impairment, dry hole costs and abandonment expense	558	1,255
Proved Oil And Gas Properties [Member]
Summary Of Significant Accounting Policies [Line Items]
Non-cash impairment of oil and gas properties	0	0
Unproved Oil And Gas Properties [Member]
Summary Of Significant Accounting Policies [Line Items]
Non-cash impairment of oil and gas properties	$ 183	$ 58

Summary of Significant Accoun36

Summary of Significant Accounting Policies - Accounts Payable and Accrued Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Accounting Policies [Abstract]
Accrued drilling, completion and facility costs	$ 16,296	$ 32,895
Accrued lease operating, gathering, transportation and processing expenses	5,031	4,930
Accrued general and administrative expenses	5,282	10,962
Accrued interest payable	28,545	13,918
Trade payables and other	4,017	1,632
Total accounts payable and accrued liabilities	$ 59,171	$ 64,337

Summary of Significant Accoun37

Summary of Significant Accounting Policies - Calculation of Basic and Diluted Earnings (Loss) Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Accounting Policies [Abstract]
Net Income (Loss)	$ (46,496)	$ (11,731)	$ (487,771)
Basic weighted-average common shares outstanding in period (in shares)	48,499,296	48,198,948
Diluted weighted-average common shares outstanding in period (in shares)	48,499,296	48,198,948
Net Income (Loss) Per Common Share, Basic (in dollars per share)	$ (0.96)	$ (0.24)
Net Income (Loss) Per Common Share, Diluted (in dollars per share)	$ (0.96)	$ (0.24)

Supplemental Disclosures of C38

Supplemental Disclosures of Cash Flow Information - Supplemental Cash Flow Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Supplemental Cash Flow Information [Abstract]
Cash paid for interest	$ 480	$ 1,105
Cash paid for income taxes	0	1,050
Supplemental disclosures of non-cash investing and financing activities:
Accrued liabilities - oil and gas properties	17,518	74,984
Change in asset retirement obligations, net of disposals	(60)	(525)
Retirement of treasury stock	$ (384)	$ (975)

Long-Term Debt - Outstanding De

Long-Term Debt - Outstanding Debt (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Mar. 12, 2012	Sep. 27, 2011
Debt Instrument [Line Items]
Principal amount of debt instrument	$ 803,249	$ 803,361
Unamortized Debt Issuance Expense	8,277	8,709
Carrying Amount	794,972	794,652
Debt, fair value	$ 512,000	542,200
Amended Credit Facility
Debt Instrument [Line Items]
Maturity Date	Apr. 9, 2020
Principal amount of debt instrument	$ 0	0
Unamortized Debt Issuance Expense	0	0
Carrying Amount	0	0
Debt, fair value	$ 0
Convertible Notes
Debt Instrument [Line Items]
Maturity Date	Mar. 15, 2028
Principal amount of debt instrument	$ 579	579
Unamortized Debt Issuance Expense	0	0
Carrying Amount	579	579
Aggregate fair value of convertible notes	$ 500
Debt, stated interest rate	5.00%
Debt, fair value	$ 500
7.625% Senior Notes
Debt Instrument [Line Items]
Maturity Date	Oct. 1, 2019
Principal amount of debt instrument	$ 400,000	400,000		$ 400,000
Unamortized Debt Issuance Expense	3,502	3,752
Carrying Amount	$ 396,498	$ 396,248
Debt, stated interest rate	7.625%	7.625%
Debt, fair value	$ 270,000	$ 270,200
7.0% Senior Notes
Debt Instrument [Line Items]
Maturity Date	Oct. 15, 2022
Principal amount of debt instrument	$ 400,000	400,000	$ 400,000
Unamortized Debt Issuance Expense	4,771	4,953
Carrying Amount	$ 395,229	$ 395,047
Debt, stated interest rate	7.00%	7.00%
Debt, fair value	$ 242,000	$ 272,000
Lease Financing Obligation
Debt Instrument [Line Items]
Maturity Date	Aug. 10, 2020
Principal amount of debt instrument	$ 3,113	3,222
Unamortized Debt Issuance Expense	4	4
Carrying Amount	3,109	3,218
Debt, fair value	3,000	3,100
Long-term Debt
Debt Instrument [Line Items]
Principal amount of debt instrument	803,692	803,801
Unamortized Debt Issuance Expense	8,277	8,709
Carrying Amount	795,415	795,092
Current Portion of Long-Term Debt
Debt Instrument [Line Items]
Principal amount of debt instrument	443	440
Unamortized Debt Issuance Expense	0	0
Carrying Amount	$ 443	$ 440

Long-Term Debt Long-Term Debt -

Long-Term Debt Long-Term Debt - Additional Information (Detail)	1 Months Ended		3 Months Ended
	Mar. 20, 2015USD ($)	Mar. 20, 2012USD ($)	Mar. 31, 2016USD ($)Lenders	Mar. 31, 2015USD ($)	Apr. 11, 2016USD ($)	Dec. 31, 2015USD ($)	Mar. 12, 2012USD ($)	Sep. 27, 2011USD ($)	Mar. 12, 2008USD ($)
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity			$ 375,000,000
Number of Lenders, Credit Facility | Lenders			13
Line of credit facility, remaining borrowing capacity			$ 349,000,000		$ 309,000,000
Principal amount			803,249,000			$ 803,361,000
Gain (Loss) on extinguishment of debt			0	$ 2,567,000
Purchase of equipment			$ 1,800,000
Amended Credit Facility
Debt Instrument [Line Items]
Debt instrument, maturity date			Apr. 9, 2020
Letters of credit issued amount			$ 26,000,000
Principal amount			$ 0			0
5% Convertible Senior Notes
Debt Instrument [Line Items]
Principal amount									$ 172,500,000
Face Amount of Outstanding Convertible Notes Repaid	$ 24,800,000	$ 147,200,000
Percentage of notes put to company	98.00%	85.00%
Debt, stated interest rate			5.00%
Convertible Notes
Debt Instrument [Line Items]
Debt instrument, maturity date			Mar. 15, 2028
Principal amount			$ 579,000			579,000
Debt, stated interest rate			5.00%
Debt instrument conversion price rate of redemption			100.00%
Minimum days notice to call Convertible Notes			30 days
7.625% Senior Notes
Debt Instrument [Line Items]
Debt instrument, maturity date			Oct. 1, 2019
Principal amount			$ 400,000,000			$ 400,000,000		$ 400,000,000
Debt, stated interest rate			7.625%			7.625%
7.0% Senior Notes
Debt Instrument [Line Items]
Debt instrument, maturity date			Oct. 15, 2022
Principal amount			$ 400,000,000			$ 400,000,000	$ 400,000,000
Debt, stated interest rate			7.00%			7.00%
Par value of senior notes			103.50%
Lease Financing Obligation
Debt Instrument [Line Items]
Debt instrument, maturity date			Aug. 10, 2020
Principal amount			$ 3,113,000			$ 3,222,000
Weighted average implicit rate based on interest expense			3.30%
Minimum
Debt Instrument [Line Items]
Revolving credit facility, interest rate above London Interbank Offered Rate			1.50%
Revolving credit facility interest rate percent above LIBOR alternate interest rate			0.50%
Commitment fee percentage			0.375%
Maximum
Debt Instrument [Line Items]
Revolving credit facility, interest rate above London Interbank Offered Rate			2.50%
Revolving credit facility interest rate percent above LIBOR alternate interest rate			1.50%
Commitment fee percentage			0.50%
Subsequent Event [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity					$ 335,000,000

Long-Term Debt - Cash and Non-C

Long-Term Debt - Cash and Non-Cash Portion of Interest Expense Related to Long Term Debt (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Mar. 12, 2012	Sep. 27, 2011
Debt Instrument [Line Items]
Principal amount of debt instrument	$ 803,249		$ 803,361
Cash interest [Member]
Debt Instrument [Line Items]
Amended Credit Facility interest	438	$ 433
Non-cash interest [Member]
Debt Instrument [Line Items]
Amended Credit Facility interest	$ 207	586
Convertible Notes
Debt Instrument [Line Items]
Debt, stated interest rate	5.00%
Effective interest rate of debt instrument	5.00%
Principal amount of debt instrument	$ 579		$ 579
Convertible Notes | Cash interest [Member]
Debt Instrument [Line Items]
Convertible Notes interest	22	276
Convertible Notes | Non-cash interest [Member]
Debt Instrument [Line Items]
Convertible Notes interest	$ 0	3
7.625% Senior Notes
Debt Instrument [Line Items]
Debt, stated interest rate	7.625%		7.625%
Effective interest rate of debt instrument	8.00%
Principal amount of debt instrument	$ 400,000		$ 400,000		$ 400,000
7.625% Senior Notes | Cash interest [Member]
Debt Instrument [Line Items]
Senior Notes interest	7,625	7,625
7.625% Senior Notes | Non-cash interest [Member]
Debt Instrument [Line Items]
Senior Notes interest	$ 250	273
7.0% Senior Notes
Debt Instrument [Line Items]
Debt, stated interest rate	7.00%		7.00%
Effective interest rate of debt instrument	7.20%
Principal amount of debt instrument	$ 400,000		$ 400,000	$ 400,000
7.0% Senior Notes | Cash interest [Member]
Debt Instrument [Line Items]
Senior Notes interest	7,000	7,000
7.0% Senior Notes | Non-cash interest [Member]
Debt Instrument [Line Items]
Senior Notes interest	$ 181	204
Lease Financing Obligation
Debt Instrument [Line Items]
Effective interest rate of debt instrument	3.30%
Principal amount of debt instrument	$ 3,113		$ 3,222
Lease Financing Obligation | Cash interest [Member]
Debt Instrument [Line Items]
Financial Obligation interest	26	29
Lease Financing Obligation | Non-cash interest [Member]
Debt Instrument [Line Items]
Financial Obligation interest	$ 0	$ 0

Asset Retirement Obligations -

Asset Retirement Obligations - Schedule of Asset Retirement Obligations (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2016USD ($)
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
As of December 31, 2015	$ 15,176
Liabilities incurred	0
Liabilities settled	(8)
Disposition of properties	(52)
Accretion expense	274
Revisions to estimate	0
As of March 31, 2016	15,390
Less: liabilities associated with assets held for sale	4,785
Less: current asset retirement obligations	502
Long-term asset retirement obligations	$ 10,103

Fair Value Measurements - Fair

Fair Value Measurements - Fair Value, Balance Sheet Grouping (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Assets
Cash equivalents (1)	$ 105,563	$ 128,836	$ 33,772	$ 165,904
Commodity derivatives (1)	95,177	119,471
Assets held for sale, net of amortization and impairment	33,717	0
Liabilities
Commodity derivatives (1)	0
Total
Assets
Cash equivalents (1)	60,095	60,065
Deferred compensation plan (1)	1,208	1,231
Commodity derivatives (1)	95,184	119,471
Assets held for sale (2)	33,717
Liabilities
Commodity derivatives (1)	7
Level 1
Assets
Cash equivalents (1)	60,095	60,065
Deferred compensation plan (1)	1,208	1,231
Commodity derivatives (1)	0	0
Assets held for sale (2)	0
Liabilities
Commodity derivatives (1)	0
Level 2
Assets
Cash equivalents (1)	0	0
Deferred compensation plan (1)	0	0
Commodity derivatives (1)	95,184	119,471
Assets held for sale (2)	0
Liabilities
Commodity derivatives (1)	7
Level 3
Assets
Cash equivalents (1)	0	0
Deferred compensation plan (1)	0	0
Commodity derivatives (1)	0	0
Liabilities
Commodity derivatives (1)	0
Proved Oil And Gas Properties [Member]
Assets
Assets held for sale, net of amortization and impairment	572,200
Proved Oil And Gas Properties [Member] | Total
Assets
Assets held for sale		178,221
Proved Oil And Gas Properties [Member] | Level 1
Assets
Assets held for sale		0
Proved Oil And Gas Properties [Member] | Level 2
Assets
Assets held for sale		0
Proved Oil And Gas Properties [Member] | Level 3
Assets
Assets held for sale		178,221
Unproved Oil And Gas Properties [Member]
Assets
Assets held for sale, net of amortization and impairment	4,300
Unproved Oil And Gas Properties [Member] | Total
Assets
Assets held for sale		5,539
Unproved Oil And Gas Properties [Member] | Level 1
Assets
Assets held for sale		0
Unproved Oil And Gas Properties [Member] | Level 2
Assets
Assets held for sale		0
Unproved Oil And Gas Properties [Member] | Level 3
Assets
Assets held for sale		$ 5,539
Liabilities of Assets Held-for-Sale [Domain] | Total
Liabilities
Liabilities associated with assets held for sale (2)	4,785
Liabilities of Assets Held-for-Sale [Domain] | Level 1
Liabilities
Liabilities associated with assets held for sale (2)	0
Liabilities of Assets Held-for-Sale [Domain] | Level 2
Liabilities
Liabilities associated with assets held for sale (2)	0
Liabilities of Assets Held-for-Sale [Domain] | Level 3
Liabilities
Liabilities associated with assets held for sale (2)	$ 4,785

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Mar. 31, 2016
Fair Value Measurements [Line Items]
Property, Plant, and Equipment, Fair Value Disclosure	$ 183.8
Debt, fair value	542.2	$ 512
Assets, Fair Value Disclosure, Nonrecurring		$ 28.9
Impairment of Oil and Gas Properties	$ 572.4
7.625% Senior Notes
Fair Value Measurements [Line Items]
Debt, stated interest rate	7.625%	7.625%
Debt, fair value	$ 270.2	$ 270
7.0% Senior Notes
Fair Value Measurements [Line Items]
Debt, stated interest rate	7.00%	7.00%
Debt, fair value	$ 272	$ 242
Amended Credit Facility
Fair Value Measurements [Line Items]
Debt, fair value		$ 0
Convertible Notes
Fair Value Measurements [Line Items]
Debt, stated interest rate		5.00%
Debt, fair value		$ 0.5
Lease Financing Obligation
Fair Value Measurements [Line Items]
Debt, fair value	$ 3.1	$ 3

Fair Value Measurements Fair Va

Fair Value Measurements Fair Value Measurements, Nonrecurring (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Capitalized Costs, Oil and Gas Producing Activities, Net	$ 1,132,103	$ 1,160,898
Impairment of Assets Held For Sale, Long Lived, Fair Value Disclosure	(542,800)
Assets held for sale, net of amortization and impairment	33,717	$ 0
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets held for sale (2)	0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets held for sale (2)	0
Proved Oil And Gas Properties [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets held for sale, net of amortization and impairment	572,200
Unproved Oil And Gas Properties [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets held for sale, net of amortization and impairment	$ 4,300

Derivative Instruments - Fair V

Derivative Instruments - Fair Value Amounts of Derivative Instruments (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Gross Amounts of Recognized Assets	$ 95,184	$ 119,471
Gross Amounts Offset in the Balance Sheet	(7)	0
Net Amounts of Assets Presented in the Balance Sheet	95,177	119,471
Gross Amounts of Recognized Liabilities	7
Gross Amounts Offset in the Balance Sheet	7
Net Amounts of Liabilities Presented in the Balance Sheet	0
Derivative assets (current)
Derivatives, Fair Value [Line Items]
Gross Amounts of Recognized Assets	80,381	99,809
Gross Amounts Offset in the Balance Sheet	(7)	0
Net Amounts of Assets Presented in the Balance Sheet	80,374	99,809
Derivative assets (noncurrent)
Derivatives, Fair Value [Line Items]
Gross Amounts of Recognized Assets	14,803	19,662
Gross Amounts Offset in the Balance Sheet	0	0
Net Amounts of Assets Presented in the Balance Sheet	14,803	$ 19,662
Derivative liabilities
Derivatives, Fair Value [Line Items]
Gross Amounts of Recognized Liabilities	7
Gross Amounts Offset in the Balance Sheet	7
Net Amounts of Liabilities Presented in the Balance Sheet	0
Derivatives and other noncurrent liabilities
Derivatives, Fair Value [Line Items]
Gross Amounts of Recognized Liabilities	0
Gross Amounts Offset in the Balance Sheet	0
Net Amounts of Liabilities Presented in the Balance Sheet	$ 0

Derivative Instruments - Financ

Derivative Instruments - Financial Instruments for Hedging Volume (Detail)	Mar. 31, 2016USD ($)MMBTUbbl
April – December 2016
Derivative Instruments, Gain (Loss) [Line Items]
Oil (Bbls) | bbl	1,906,300
Weighted Average Price, Hedge Backed Oil Volumes	$ 78.25
Natural Gas (MMbtu) | MMBTU	1,375,000
Weighted Average Price, Hedge Backed Gas Volumes	$ 4.10
For the year 2017
Derivative Instruments, Gain (Loss) [Line Items]
Oil (Bbls) | bbl	683,250
Weighted Average Price, Hedge Backed Oil Volumes	$ 75.61
Natural Gas (MMbtu) | MMBTU	0
Weighted Average Price, Hedge Backed Gas Volumes	$ 0

Derivative Instruments - Additi

Derivative Instruments - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2016Counterparty
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Number of counterparties for hedges at period end	8

Income Taxes Income Taxes (Deta

Income Taxes Income Taxes (Details)	3 Months Ended
	Mar. 31, 2016
Income Tax Disclosure [Abstract]
Effective income tax rate (percent)	0.00%

Equity Incentive Compensation50

Equity Incentive Compensation Plans and Other Long-term Incentive Programs - Non-Cash Stock-Based Compensation Cost Related to Equity Awards (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Stock Based Compensation [Line Items]
Non-cash stock-based compensation equity awards	$ 3,926	$ 2,758
Common Stock Options
Stock Based Compensation [Line Items]
Non-cash stock-based compensation equity awards	69	242
Nonvested Equity Common Stock
Stock Based Compensation [Line Items]
Non-cash stock-based compensation equity awards	2,404	1,574
Nonvested Equity Common Stock Units
Stock Based Compensation [Line Items]
Non-cash stock-based compensation equity awards	290	261
Nonvested Performance-Based Equity
Stock Based Compensation [Line Items]
Non-cash stock-based compensation equity awards	678	430
Nonvested Performance Cash Units [Member]
Stock Based Compensation [Line Items]
Cash Unit Based Compensation Awards	$ 485	$ 251

Equity Incentive Compensation51

Equity Incentive Compensation Plans and Other Long-term Incentive Programs - Additional Information (Detail) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2016USD ($)shares$ / shares	Mar. 31, 2015shares	Dec. 31, 2015USD ($)
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Closing Share Price, December 31, 2015 | $ / shares	$ 3.93
Payout If Share Price Less Than $3.93	$ 0
Maximum Number Of Cash Units Vest As Percentage Of Performance Cash Units Granted	200.00%
Unrecognized compensation cost	$ 9.8
Weighted-average period (years)	2 years 1 month
Nonvested Performance Cash Units [Member]
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Number Of Performance Cash Units Granted | shares	646,572	405,836
Deferred Compensation Cash-based Arrangements, Liability, Current and Noncurrent	$ 0.9		$ 0.4

Equity Incentive Compensation52

Equity Incentive Compensation Plans and Other Long-term Incentive Programs - Stock Options and Nonvested Equity Shares, Equity Awards Granted (Detail)	3 Months Ended
	Mar. 31, 2016shares$ / shares$ / unit	Mar. 31, 2015shares$ / shares$ / unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested equity shares, Number of Shares	686,500	622,609
Nonvested equity common stock units, Number of Shares	3,014	2,259
Nonvested performance-based equity shares, Number of Shares	0	0
Total shares granted	689,514	624,868
Nonvested equity shares, Weighted Average Grant Date Fair Value | $ / shares	$ 5.11	$ 12.30
Nonvested equity common stock units, Weighted Average Grant Date Fair Value | $ / shares	6.22	8.30
Nonvested performance-based equity shares, Weighted Average Grant Date Fair Value | $ / shares	$ 0	$ 0
Performance Cash Unit, Fair Value Per Unit | $ / unit	6.22	12.31
Nonvested Performance Cash Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number Of Performance Cash Units Granted	646,572	405,836

Equity Distribution Agreement (

Equity Distribution Agreement (Details) - USD ($)	Jun. 10, 2015	Mar. 31, 2016
Equity Distribution Agreement [Abstract]
Maximum Aggregate Offering Price	$ 100,000,000
Number of Shares Sold, Equity Distribution Agreement		0

Commitments and Contingencies -

Commitments and Contingencies - Schedule of Aggregate Undiscounted Minimum Future Lease Payments (Detail) - Lease Financing Obligation $ in Thousands	Mar. 31, 2016USD ($)
Future Minimum Lease Payments Under Capital Leases And Operating Leases For Continuing Operations [Line Items]
2,016	$ 403
2,017	537
2,018	537
2,019	1,825
2,020	0
Thereafter	0
Total	$ 3,302

Commitments and Contingencies55

Commitments and Contingencies - Additional Information (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2016USD ($)Agreement
Contingencies And Commitments [Line Items]
Drilling Commitment | $	$ 3.2
Number of Firm Transportation Contracts | Agreement	2
Maximum
Contingencies And Commitments [Line Items]
Contract term, years	5 years

Commitments and Contingencies56

Commitments and Contingencies - Gross Future Minimum Transportation Demand and Firm Processing Charges (Detail) $ in Thousands	Mar. 31, 2016USD ($)
Commitments and Contingencies Disclosure [Abstract]
2,016	$ 13,774
2,017	18,692
2,018	18,692
2,019	18,692
2,020	18,692
Thereafter	10,902
Total	$ 99,444

Commitments and Contingencies57

Commitments and Contingencies - Future Minimum Annual Payments under Drilling, Lease and Other Agreements (Detail) - Office & Equipment Leases $ in Thousands	Mar. 31, 2016USD ($)
Operating Leased Assets [Line Items]
2,016	$ 5,715
2,017	2,882
2,018	2,591
2,019	633
2,020	0
Thereafter	0
Total	$ 11,821

Guarantor Subsidiaries - Additi

Guarantor Subsidiaries - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Condensed Financial Statements, Captions [Line Items]
Percentage of Guarantor Subsidiaries	100.00%
7.625% Senior Notes
Condensed Financial Statements, Captions [Line Items]
Debt, stated interest rate	7.625%	7.625%
7.0% Senior Notes
Condensed Financial Statements, Captions [Line Items]
Debt, stated interest rate	7.00%	7.00%

Guarantor Subsidiaries - Schedu

Guarantor Subsidiaries - Schedule of Condensed Consolidating Balance Sheets (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Assets:
Current assets	$ 253,363	$ 274,317
Property and equipment, net	1,141,629	1,170,684
Intercompany receivable (payable)	0	0
Investment in subsidiaries	0	0
Noncurrent assets	49,218	61,519
Total	1,444,210	1,506,520
Liabilities and Stockholders' Equity:
Current liabilities	129,583	145,231
Long-term debt, net of debt issuance costs	794,972	794,652
Other noncurrent liabilities	13,678	17,221
Stockholders' equity	505,977	549,416	$ 1,029,488
Total liabilities and stockholders' equity	1,444,210	1,506,520
Parent Issuer
Assets:
Current assets	253,100	274,115
Property and equipment, net	1,135,183	1,164,086
Intercompany receivable (payable)	21,316	21,412
Investment in subsidiaries	(14,660)	(14,664)
Noncurrent assets	49,218	61,519
Total	1,444,157	1,506,468
Liabilities and Stockholders' Equity:
Current liabilities	129,530	145,231
Long-term debt, net of debt issuance costs	794,972	794,652
Other noncurrent liabilities	13,678	17,169
Stockholders' equity	505,977	549,416
Total liabilities and stockholders' equity	1,444,157	1,506,468
Guarantor Subsidiaries
Assets:
Current assets	263	202
Property and equipment, net	6,446	6,598
Intercompany receivable (payable)	(21,316)	(21,412)
Investment in subsidiaries	0	0
Noncurrent assets	0	0
Total	(14,607)	(14,612)
Liabilities and Stockholders' Equity:
Current liabilities	53	0
Long-term debt, net of debt issuance costs	0	0
Other noncurrent liabilities	0	52
Stockholders' equity	(14,660)	(14,664)
Total liabilities and stockholders' equity	(14,607)	(14,612)
Intercompany Eliminations
Assets:
Current assets	0	0
Property and equipment, net	0	0
Intercompany receivable (payable)	0	0
Investment in subsidiaries	14,660	14,664
Noncurrent assets	0	0
Total	14,660	14,664
Liabilities and Stockholders' Equity:
Current liabilities	0	0
Long-term debt, net of debt issuance costs	0	0
Other noncurrent liabilities	0	0
Stockholders' equity	14,660	14,664
Total liabilities and stockholders' equity	$ 14,660	$ 14,664

Guarantor Subsidiaries - Sche60

Guarantor Subsidiaries - Schedule of Condensed Consolidating Statements of Operations (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Condensed Financial Statements, Captions [Line Items]
Operating and other revenues	$ 29,434	$ 49,034
Operating expenses	(56,469)	(75,159)
General and administrative	(12,420)	(13,329)
Interest and other income (expense)	(7,041)	20,850
Income (loss) before income taxes and equity in earnings (loss) of subsidiaries	(46,496)	(18,604)
(Provision for) Benefit from Income Taxes	0	6,873
Equity in earnings (loss) of subsidiaries	0	0
Net Income (Loss)	(46,496)	(11,731)	$ (487,771)
Parent Issuer
Condensed Financial Statements, Captions [Line Items]
Operating and other revenues	29,266	48,896
Operating expenses	(56,305)	(74,998)
General and administrative	(12,420)	(13,329)
Interest and other income (expense)	(7,041)	20,850
Income (loss) before income taxes and equity in earnings (loss) of subsidiaries	(46,500)	(18,581)
(Provision for) Benefit from Income Taxes	0	6,873
Equity in earnings (loss) of subsidiaries	4	(23)
Net Income (Loss)	(46,496)	(11,731)
Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Operating and other revenues	168	138
Operating expenses	(164)	(161)
General and administrative	0	0
Interest and other income (expense)	0	0
Income (loss) before income taxes and equity in earnings (loss) of subsidiaries	4	(23)
(Provision for) Benefit from Income Taxes	0	0
Equity in earnings (loss) of subsidiaries	0	0
Net Income (Loss)	4	(23)
Intercompany Eliminations
Condensed Financial Statements, Captions [Line Items]
Operating and other revenues	0	0
Operating expenses	0	0
General and administrative	0	0
Interest and other income (expense)	0	0
Income (loss) before income taxes and equity in earnings (loss) of subsidiaries	0	0
(Provision for) Benefit from Income Taxes	0	0
Equity in earnings (loss) of subsidiaries	(4)	23
Net Income (Loss)	$ (4)	$ 23

Guarantor Subsidiaries - Sche61

Guarantor Subsidiaries - Schedule of Condensed Consolidating Statements of Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	$ (46,496)	$ (11,731)	$ (487,771)
Other comprehensive income (loss)	0	0
Comprehensive Income (Loss)	(46,496)	(11,731)
Parent Issuer
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	(46,496)	(11,731)
Other comprehensive income (loss)	0	0
Comprehensive Income (Loss)	(46,496)	(11,731)
Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	4	(23)
Other comprehensive income (loss)	0	0
Comprehensive Income (Loss)	4	(23)
Intercompany Eliminations
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	(4)	23
Other comprehensive income (loss)	0	0
Comprehensive Income (Loss)	$ (4)	$ 23

Guarantor Subsidiaries - Sche62

Guarantor Subsidiaries - Schedule of Condensed Consolidating Statements of Cash Flows (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities	$ 40,515	$ 53,825
Cash flows from investing activities:
Additions to oil and gas properties, including acquisitions	(61,261)	(111,009)
Additions to furniture, fixtures and other	(782)	(609)
Proceeds from sale of properties and other investing activities	(1,238)	66,415
Cash paid for short-term investments	0	(114,883)
Intercompany Transfers Investing Activities	0	0
Cash flows from financing activities:
Principal payments on debt	(109)	(24,871)
Intercompany Transfer Financing Activities	0	0
Other financing activities	(398)	(1,000)
Increase (Decrease) in Cash and Cash Equivalents	(23,273)	(132,132)
Beginning Cash and Cash Equivalents	128,836	165,904
Ending Cash and Cash Equivalents	105,563	33,772
Parent Issuer
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities	40,419	53,788
Cash flows from investing activities:
Additions to oil and gas properties, including acquisitions	(61,261)	(112,105)
Additions to furniture, fixtures and other	(782)	(609)
Proceeds from sale of properties and other investing activities	(1,238)	66,415
Cash paid for short-term investments		(114,883)
Intercompany Transfers Investing Activities	96	1,133
Cash flows from financing activities:
Principal payments on debt	(109)	(24,871)
Intercompany Transfer Financing Activities	0	0
Other financing activities	(398)	(1,000)
Increase (Decrease) in Cash and Cash Equivalents	(23,273)	(132,132)
Beginning Cash and Cash Equivalents	128,836	165,904
Ending Cash and Cash Equivalents	105,563	33,772
Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities	96	37
Cash flows from investing activities:
Additions to oil and gas properties, including acquisitions	0	1,096
Additions to furniture, fixtures and other	0	0
Proceeds from sale of properties and other investing activities	0	0
Cash paid for short-term investments		$ 0
Intercompany Transfers Investing Activities	0
Cash flows from financing activities:
Principal payments on debt	0	$ 0
Intercompany Transfer Financing Activities	(96)	(1,133)
Other financing activities	0	0
Increase (Decrease) in Cash and Cash Equivalents	0	0
Beginning Cash and Cash Equivalents	0	0
Ending Cash and Cash Equivalents	0	0
Intercompany Eliminations
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities	0	0
Cash flows from investing activities:
Additions to oil and gas properties, including acquisitions	0	0
Additions to furniture, fixtures and other	0	0
Proceeds from sale of properties and other investing activities	0	0
Cash paid for short-term investments		0
Intercompany Transfers Investing Activities	(96)	(1,133)
Cash flows from financing activities:
Principal payments on debt	0	0
Intercompany Transfer Financing Activities	96	1,133
Other financing activities	0	0
Increase (Decrease) in Cash and Cash Equivalents	0	0
Beginning Cash and Cash Equivalents	0	0
Ending Cash and Cash Equivalents	$ 0	$ 0

Subsequent Events (Details)

Subsequent Events (Details) - Subsequent Event [Member] $ in Millions	Apr. 28, 2016USD ($)
Subsequent Event [Line Items]
Amortization And Impairment, Assets Held For Sale	$ 33.7
Assets held for sale (2)	28.9
Liabilities associated with assets held for sale	$ 4.8