Unaudited Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Revenues
Crude oil and natural gas sales	$ 525,711	$ 790,102	$ 929,302	$ 1,371,294
Crude oil and natural gas sales to affiliates	0	0	0	1,400
Gain (loss) on crude oil and natural gas derivatives, net	(82,257)	(4,737)	(40,145)	28,018
Crude oil and natural gas service operations	7,757	11,009	15,227	21,306
Total revenues	451,211	796,374	904,384	1,422,018
Operating costs and expenses
Production expenses	74,083	91,667	152,724	183,021
Production expenses to affiliates	0	68	0	1,654
Production Tax Expense	39,141	61,545	69,634	109,908
Exploration expenses	1,674	109	4,739	14,449
Crude oil and natural gas service operations	3,576	7,092	6,618	10,986
Depreciation, depletion, amortization and accretion	441,761	452,957	905,752	839,469
Property impairments	66,112	76,872	145,039	224,432
General and administrative expenses	36,246	44,190	68,654	89,571
Net gain on sale of assets and other	(100,835)	(20,573)	(99,127)	(22,643)
Total operating costs and expenses	561,758	713,927	1,254,033	1,450,847
Income (loss) from operations	(110,547)	82,447	(349,649)	(28,829)
Other income (expense):
Interest expense	(81,922)	(78,442)	(162,875)	(153,505)
Other	435	540	819	886
Total other income (expense)	(81,487)	(77,902)	(162,056)	(152,619)
Income (loss) before income taxes	(192,034)	4,545	(511,705)	(181,448)
Provision (benefit) for income taxes	(72,632)	4,142	(193,978)	(49,880)
Net income (loss)	(119,402)	403	(317,727)	(131,568)
Foreign Currency Transaction and Translation Loss Arising During Period, Net of Tax	25	625	451	(2,480)
Other Comprehensive Income (Loss), Net of Tax (unaudited)	25	625	451	(2,480)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$ (119,377)	$ 1,028	$ (317,276)	$ (134,048)
Basic net income (loss) per share (in dollars per share)	$ (0.32)	$ 0.00	$ (0.86)	$ (0.36)
Diluted net income (loss) per share (in dollars per share)	$ (0.32)	$ 0.00	$ (0.86)	$ (0.36)