Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities:
Net income (loss)	$ (2,239,643)	$ (326,720)	$ 10,577
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depletion, depreciation and amortization	182,417	189,516	137,068
Impairments	1,576,728	423,092	1,125
Gain on sale of assets		(1,375)
Accretion expense	1,930	958	952
Deferred tax expense	3,087	34,987
Accrued interest expense and unamortized debt discount	16,667	9,257	10,328
Amortization of deferred financing costs	16,154	11,341	9,587
Non-cash loss (gain) on derivative instruments	62,790	(125,226)	46,545
Amortization of option premiums	(4,645)	(7,216)	(1,171)
Amortization of prepaid expenses	6,770	2,912	4,787
Non-cash stock based compensation	1,772	1,041
Other, net	(762)	(72)	(249)
Reorganization items, net	434,800
Working capital and other changes:
(Increase) decrease in accounts receivable	85,006	26,286	(38,195)
Increase in other assets	(11,681)	(16,192)	(7,248)
Increase (decrease) in liabilities	3,019	(13,388)	43,092
Net cash provided by operating activities	134,409	209,201	217,198
Cash flows from investing activities:
Oil and natural gas property additions	(332,771)	(548,841)	(360,080)
Oil and natural gas property acquisitions		(36,772)
Cash received in Forest acquisition		134,887
Cash received from insurance proceeds			604
Gas processing equipment additions	(1,497)	(2,988)	(4,014)
Other asset additions	(1,877)	(2,242)	(2,075)
Cash received from sale of assets	6,749	17,342	171,756
Net cash used in investing activities	(329,396)	(438,614)	(193,809)
Cash flows from financing activities:
Borrowings under senior secured revolving credit facility	425,987	1,209,835	193,000
Borrowings under second lien term loan			153,500
Debt repayments for the senior secured revolving credit facility	(24,324)	(969,835)	(348,000)
Debt issuance costs	(1,110)	(19,156)	(6,261)
Shares repurchased	(181)
Distributions			(10,000)
Net cash provided by (used in) financing activities	400,372	220,844	(17,761)
Net increase (decrease) in cash and cash equivalents	205,385	(8,569)	5,628
Cash and cash equivalents, beginning of period	3,252	11,821	6,193
Cash and cash equivalents, end of period	208,637	3,252	11,821
Supplemental cash flow information
Cash paid for interest, net of interest capitalized	60,073	$ 96,701	$ 76,701
Cash paid for reorganization items	$ 24,038