Unaudited Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Revenues
Crude oil and natural gas sales	$ 505,892	$ 628,457	$ 1,435,194	$ 1,999,751
Crude oil and natural gas sales to affiliates	0	0	0	1,400
Gain (loss) on crude oil and natural gas derivatives, net	15,668	46,527	(24,477)	74,545
Crude oil and natural gas service operations	4,639	7,685	19,867	28,991
Total revenues	526,199	682,669	1,430,584	2,104,687
Operating costs and expenses
Production expenses	67,022	84,036	219,745	267,058
Production expenses to affiliates	0	0	0	1,654
Production taxes and other expenses	34,583	47,682	104,216	157,589
Exploration expenses	3,987	232	8,726	14,680
Crude oil and natural gas service operations	2,605	4,059	9,224	15,045
Depreciation, depletion, amortization and accretion	414,671	448,809	1,320,423	1,288,278
Property impairments	57,689	96,697	202,728	321,130
General and administrative expenses	44,389	53,798	113,043	143,368
Net gain on sale of assets and other	(5,564)	(288)	(104,690)	(22,930)
Total operating costs and expenses	619,382	735,025	1,873,415	2,185,872
Loss from operations	(93,183)	(52,356)	(442,831)	(81,185)
Other income (expense):
Interest expense	(82,074)	(79,399)	(244,949)	(232,904)
Other	360	588	1,178	1,474
Total other income (expense)	(81,714)	(78,811)	(243,771)	(231,430)
Loss before income taxes	(174,897)	(131,167)	(686,602)	(312,615)
Benefit for income taxes	(65,276)	(48,744)	(259,254)	(98,623)
Net loss	(109,621)	(82,423)	(427,348)	(213,992)
Foreign currency transaction and translation gain (loss), net of tax	418	(438)	869	(2,918)
Other Comprehensive Income (Loss), Net of Tax (unaudited)	418	(438)	869	(2,918)
Comprehensive loss, net of tax	$ (109,203)	$ (82,861)	$ (426,479)	$ (216,910)
Basic net loss per share (in dollars per share)	$ (0.30)	$ (0.22)	$ (1.15)	$ (0.58)
Diluted net loss per share (in dollars per share)	$ (0.30)	$ (0.22)	$ (1.15)	$ (0.58)