CONDENSED CONSOLIDATED STATEMENT OF OPERATIONS (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Operating revenue:
Oil production	$ 107,507	$ 138,289
Natural gas production	28,337	56,362
Natural gas liquids production	12,366	27,970
Other operational income	2,160	1,209
Derivative income, net	3,128
Total operating revenue	153,498	223,830
Operating expenses:
Lease operating expenses	27,577	46,903
Transportation, processing and gathering expenses	17,703	14,626
Production taxes	2,515	3,062
Depreciation, depletion and amortization	86,422	82,646
Write-down of oil and gas properties	491,412
Accretion expense	6,409	7,555
Salaries, general and administrative expenses	17,007	16,329
Incentive compensation expense	1,563	3,134
Other operational expenses	84	424
Derivative expense, net		599
Total operating expenses	650,692	175,278
Income (loss) from operations	(497,194)	48,552
Other (income) expenses:
Interest expense	10,365	8,357
Interest income	(122)	(143)
Other income	(143)	(707)
Total other (income) expenses	10,100	7,507
Income (loss) before income taxes	(507,294)	41,045
Provision (benefit) for income taxes:
Deferred	(179,906)	15,102
Total income taxes	(179,906)	15,102
Net income (loss)	$ (327,388)	$ 25,943
Basic earnings (loss) per share	$ (5.93)	$ 0.52
Diluted earnings (loss) per share	$ (5.93)	$ 0.52
Average shares outstanding	55,181	49,013
Average shares outstanding assuming dilution	55,181	49,062