Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenues:
Crude oil and natural gas sales	$ 2,551,131	$ 4,107,894	$ 3,473,026
Crude oil and natural gas sales to affiliates	1,400	95,128	100,405
Gain (loss) on derivative instruments, net	91,085	559,759	(191,751)
Crude oil and natural gas service operations	36,551	38,837	40,127
Total revenues	2,680,167	4,801,618	3,421,807
Operating costs and expenses:
Production expenses	347,243	347,349	280,789
Production expenses to affiliates	1,654	5,123	1,408
Production taxes and other expenses	200,637	349,760	298,787
Exploration expenses	19,413	50,067	34,947
Crude oil and natural gas service operations	17,337	21,871	29,665
Depreciation, depletion, amortization and accretion	1,749,056	1,358,669	965,645
Property impairments	402,131	616,888	220,508
General and administrative expenses	189,846	184,655	144,379
Gain on sale of assets, net	(23,149)	(600)	(88)
Total operating costs and expenses	2,904,168	2,933,782	1,976,040
Income (loss) from operations	(224,001)	1,867,836	1,445,767
Other income (expense):
Interest expense	(313,079)	(283,928)	(235,275)
Loss on extinguishment of debt	0	(24,517)	0
Other	1,995	2,647	2,557
Total other income (expense)	(311,084)	(305,798)	(232,718)
Income (loss) before income taxes	(535,085)	1,562,038	1,213,049
Provision (benefit) for income taxes	(181,417)	584,697	448,830
Net income (loss)	$ (353,668)	$ 977,341	$ 764,219
Basic net income per share (in dollars per share)	$ (0.96)	$ 2.65	$ 2.08
Diluted net income per share (in dollars per share)	$ (0.96)	$ 2.64	$ 2.07
Foreign currency translation adjustments	$ (2,969)	$ (385)	$ 0
Other Comprehensive Income (Loss), Net of Tax	(2,969)	(385)	0
Comprehensive Income (Loss), Net of Tax	$ (356,637)	$ 976,956	$ 764,219