Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenues:
Crude oil and natural gas sales	$ 2,026,958	$ 2,551,131	$ 4,107,894
Crude oil and natural gas sales to affiliates	0	1,400	95,128
Gain (loss) on crude oil and natural gas derivatives, net	(71,859)	91,085	559,759
Crude oil and natural gas service operations	25,174	36,551	38,837
Total revenues	1,980,273	2,680,167	4,801,618
Operating costs and expenses:
Production expenses	289,289	347,243	347,349
Production expenses to affiliates	0	1,654	5,123
Production taxes and other expenses	142,388	200,637	349,760
Exploration expenses	16,972	19,413	50,067
Crude oil and natural gas service operations	11,386	17,337	21,871
Depreciation, depletion, amortization and accretion	1,708,744	1,749,056	1,358,669
Property impairments	237,292	402,131	616,888
General and administrative expenses	169,580	189,846	184,655
Net gain on sale of assets and other	(307,844)	(23,149)	(600)
Total operating costs and expenses	2,267,807	2,904,168	2,933,782
Income (loss) from operations	(287,534)	(224,001)	1,867,836
Other income (expense):
Interest expense	(320,562)	(313,079)	(283,928)
Loss on extinguishment of debt	(26,055)	0	(24,517)
Other	1,697	1,995	2,647
Total other income (expense)	(344,920)	(311,084)	(305,798)
Income (loss) before income taxes	(632,454)	(535,085)	1,562,038
Provision (benefit) for income taxes	(232,775)	(181,417)	584,697
Net income (loss)	$ (399,679)	$ (353,668)	$ 977,341
Basic net income (loss) per share (in dollars per share)	$ (1.08)	$ (0.96)	$ 2.65
Diluted net income (loss) per share (in dollars per share)	$ (1.08)	$ (0.96)	$ 2.64
Foreign currency translation adjustments	$ 3,094	$ (2,969)	$ (385)
Other Comprehensive Income (Loss), Net of Tax	3,094	(2,969)	(385)
Comprehensive Income (Loss)	$ (396,585)	$ (356,637)	$ 976,956