CONDENSED CONSOLIDATED STATEMENT OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Operating revenue:
Oil production	$ 60,275	$ 107,507
Natural gas production	15,173	28,337
Natural gas liquids production	4,735	12,366
Other operational income	356	2,160
Derivative income, net	138	3,128
Total operating revenue	80,677	153,498
Operating expenses:
Lease operating expenses	19,547	27,577
Transportation, processing and gathering expenses	841	17,703
Production taxes	481	2,515
Depreciation, depletion and amortization	61,558	86,422
Write-down of oil and gas properties	129,204	491,412
Accretion expense	9,983	6,409
Salaries, general and administrative expenses	13,707	17,007
Incentive compensation expense	4,979	1,563
Other operational expenses	12,527	84
Total operating expenses	252,827	650,692
Loss from operations	(172,150)	(497,194)
Other (income) expenses:
Interest expense	15,241	10,365
Interest income	(114)	(122)
Other income	(298)	(143)
Other expense	2	0
Total other expenses	14,831	10,100
Loss before income taxes	(186,981)	(507,294)
Provision (benefit) for income taxes:
Current	(1,074)	0
Deferred	2,877	(179,906)
Total income taxes	1,803	(179,906)
Net loss	$ (188,784)	$ (327,388)
Basic loss per share (usd per share)	$ (3.39)	$ (5.93)
Diluted loss per share (usd per share)	$ (3.39)	$ (5.93)
Average shares outstanding (in shares)	55,713	55,181
Average shares outstanding assuming dilution (in shares)	55,713	55,181