CONDENSED CONSOLIDATED STATEMENT OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Operating revenue:
Oil production	$ 105,013	$ 123,795	$ 324,105	$ 404,477
Natural gas production	17,367	30,154	72,611	133,183
Natural gas liquids production	5,980	21,014	29,379	64,920
Other operational income	1,392	2,468	3,184	5,515
Derivative income, net	2,444	5,782	4,871	2,667
Total operating revenue	132,196	183,213	434,150	610,762
Operating expenses:
Lease operating expenses	24,244	43,561	79,250	139,918
Transportation, processing and gathering expenses	18,208	16,721	55,851	45,445
Production taxes	2,052	3,651	6,394	9,970
Depreciation, depletion and amortization	61,936	80,291	226,309	255,772
Write-down of oil and gas properties	295,679	47,130	1,011,385	47,130
Accretion expense	6,498	6,539	19,315	21,827
Salaries, general and administrative expenses	19,552	16,286	52,977	49,252
Incentive compensation expense	794	3,092	3,621	10,129
Other operational expenses	442	298	1,612	510
Total operating expenses	429,405	217,569	1,456,714	579,953
Income (loss) from operations	(297,209)	(34,356)	(1,022,564)	30,809
Other (income) expenses:
Interest expense	10,872	10,323	31,709	28,593
Interest income	(47)	(169)	(235)	(505)
Other income	(411)	(695)	(1,167)	(2,124)
Other expense	148	95	148	274
Total other expenses	10,562	9,554	30,455	26,238
Income (loss) before income taxes	(307,771)	(43,910)	(1,053,019)	4,571
Provision (benefit) for income taxes:
Deferred	(15,806)	(14,495)	(280,760)	3,599
Total income taxes	(15,806)	(14,495)	(280,760)	3,599
Net income (loss)	$ (291,965)	$ (29,415)	$ (772,259)	$ 972
Basic earnings (loss) per share (usd per share)	$ (5.28)	$ (0.54)	$ (13.98)	$ 0.02
Diluted earnings (loss) per share (usd per share)	$ (5.28)	$ (0.54)	$ (13.98)	$ 0.02
Average shares outstanding (in shares)	55,282	54,866	55,238	51,998
Average shares outstanding assuming dilution (in shares)	55,282	54,866	55,238	52,139