CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Revenues:
Oil, natural gas, and natural gas liquids sales	$ 60,106	$ 116,786	$ 124,563	$ 234,828
Interest and other	329	28	1,066	160
Total revenues	60,435	116,814	125,629	234,988
Costs, expenses, and other:
Lease operating expenses	14,295	19,167	28,805	40,371
Production and property taxes	2,740	5,029	5,965	7,245
Transportation and processing costs	2,379	3,098	4,894	6,378
General and administrative	8,260	13,114	16,500	33,128
Depreciation, depletion, and amortization	20,303	43,804	41,718	92,347
Ceiling test write-down of oil and natural gas properties	77,176	0	77,176	0
Interest expense	15,738	29,392	31,749	65,520
Realized and unrealized losses (gains) on derivative instruments, net	11,641	(31,610)	24,492	(6,030)
Other, net	(9,302)	1,593	(654)	30,413
Total costs, expenses, and other	143,230	83,587	230,645	269,372
Earnings (loss) before income taxes	(82,795)	33,227	(105,016)	(34,384)
Income tax (benefit) expense	(78)	(212)	(1,292)	125
Net earnings (loss)	$ (82,717)	$ 33,439	$ (103,724)	$ (34,509)
Basic earnings (loss) per common share (in dollars per share)	$ (0.71)	$ 0.28	$ (0.89)	$ (0.30)
Diluted earnings (loss) per common share (in dollars per share)	$ (0.71)	$ 0.28	$ (0.89)	$ (0.30)