Consolidated Statements of Comprehensive Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues:
Crude oil and natural gas sales	$ 4,107,894	$ 3,473,026	$ 2,290,608
Crude oil and natural gas sales to affiliates	95,128	100,405	58,892
Gain (loss) on derivative instruments, net	559,759	(191,751)	154,016
Crude oil and natural gas service operations	38,837	40,127	39,071
Total revenues	4,801,618	3,421,807	2,542,587
Operating costs and expenses:
Production expenses	347,349	280,789	193,466
Production and other expenses to affiliates	5,123	1,408	1,974
Production taxes and other expenses	349,760	298,787	198,505
Exploration expenses	50,067	34,947	23,507
Crude oil and natural gas service operations	21,871	29,665	32,248
Depreciation, depletion, amortization and accretion	1,358,669	965,645	692,118
Property impairments	616,888	220,508	122,274
General and administrative expenses	184,655	144,379	121,735
Gain on sale of assets, net	(600)	(88)	(136,047)
Total operating costs and expenses	2,933,782	1,976,040	1,249,780
Income from operations	1,867,836	1,445,767	1,292,807
Other income (expense):
Interest expense	(283,928)	(235,275)	(140,708)
Loss on extinguishment of debt	(24,517)	0	0
Other	2,647	2,557	3,097
Total other income (expense)	(305,798)	(232,718)	(137,611)
Income before income taxes	1,562,038	1,213,049	1,155,196
Provision for income taxes	584,697	448,830	415,811
Net income	977,341	764,219	739,385
Basic net income per share (in dollars per share)	$ 2.65	$ 2.08	$ 2.04
Diluted net income per share (in dollars per share)	$ 2.64	$ 2.07	$ 2.03
Foreign currency translation adjustments	(385)	0	0
Other Comprehensive Income (Loss), Net of Tax	(385)	0	0
Comprehensive Income (Loss), Net of Tax	$ 976,956	$ 764,219	$ 739,385