Unaudited Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Revenues
Crude oil and natural gas sales	$ 790,102	$ 1,112,998	$ 1,371,294	$ 2,085,145
Crude oil and natural gas sales to affiliates	0	25,087	1,400	55,273
Gain (loss) on derivative instruments, net	(4,737)	(262,524)	28,018	(302,198)
Crude oil and natural gas service operations	11,009	10,534	21,306	20,370
Total revenues	796,374	886,095	1,422,018	1,858,590
Operating costs and expenses
Production expenses	91,667	84,236	183,021	160,211
Production expenses to affiliates	68	285	1,654	1,196
Production taxes and other expenses	61,545	97,025	109,908	175,327
Exploration expenses	109	11,205	14,449	16,018
Crude oil and natural gas service operations	7,092	5,979	10,986	14,053
Depreciation, depletion, amortization and accretion	452,957	326,871	839,469	599,732
Property impairments	76,872	79,316	224,432	137,524
General and administrative expenses	44,190	46,919	89,571	90,455
(Gain) loss on sale of assets, net	(20,573)	(2,135)	(22,643)	6,363
Total operating costs and expenses	713,927	649,701	1,450,847	1,200,879
Income (loss) from operations	82,447	236,394	(28,829)	657,711
Other income (expense):
Interest expense	(78,442)	(72,841)	(153,505)	(135,816)
Other	540	793	886	1,552
Total other income (expense)	(77,902)	(72,048)	(152,619)	(134,264)
Income (loss) before income taxes	4,545	164,346	(181,448)	523,447
Provision (benefit) for income taxes	4,142	60,808	(49,880)	193,675
Net income (loss)	403	103,538	(131,568)	329,772
Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	625	0	(2,480)	0
Other Comprehensive Income (Loss), Net of Tax (unaudited)	625	0	(2,480)	0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$ 1,028	$ 103,538	$ (134,048)	$ 329,772
Basic net income (loss) per share (in dollars per share)	$ 0.00	$ 0.28	$ (0.36)	$ 0.89
Diluted net income (loss) per share (in dollars per share)	$ 0.00	$ 0.28	$ (0.36)	$ 0.89