CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Oil, natural gas and natural gas liquids sales:
Oil	$ 288,850	$ 65,670	$ 672,167	$ 109,050
Natural gas	7,457	3,918	19,971	6,875
Natural gas liquids	7,894	3,230	15,976	7,080
Total oil, natural gas and natural gas liquids sales	304,201	72,818	708,114	123,005
Other	806	489	2,090	560
Total operating revenues	305,007	73,307	710,204	123,565
Production:
Lease operating	37,539	14,197	94,676	30,113
Workover and other	2,029	1,123	4,276	2,384
Taxes other than income	26,613	5,814	62,616	9,648
Gathering and other	3,766	167	6,901	274
Restructuring		725	507	1,732
General and administrative	33,762	33,124	98,885	66,327
Depletion, depreciation and accretion	143,091	22,726	320,264	34,661
Full cost ceiling impairment	909,098		909,098
Other operating property and equipment impairment	67,254		67,254
Goodwill impairment	228,875		228,875
Total operating expenses	1,452,027	77,876	1,793,352	145,139
Income (loss) from operations	(1,147,020)	(4,569)	(1,083,148)	(21,574)
Other income (expenses):
Net gain (loss) on derivative contracts	(54,427)	(9,575)	(38,749)	(849)
Interest expense and other, net	(13,663)	(5,074)	(24,245)	(22,250)
Total other income (expenses)	(68,090)	(14,649)	(62,994)	(23,099)
Income (loss) before income taxes	(1,215,110)	(19,218)	(1,146,142)	(44,673)
Income tax benefit (provision)	360,283	(963)	333,868	(1,171)
Net income (loss)	(854,827)	(20,181)	(812,274)	(45,844)
Non-cash preferred dividend				(88,445)
Series A preferred dividends	(5,070)		(5,786)
Net income (loss) available to common stockholders	$ (859,897)	$ (20,181)	$ (818,060)	$ (134,289)
Net income (loss) per share of common stock:
Basic (in dollars per share)	$ (2.19)	$ (0.11)	$ (2.22)	$ (1.01)
Diluted (in dollars per share)	$ (2.19)	$ (0.11)	$ (2.22)	$ (1.01)
Weighted average common shares outstanding:
Basic (in shares)	392,726	191,846	368,696	132,460
Diluted (in shares)	392,726	191,846	368,696	132,460