Condensed Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues:
Oil and gas sales	$ 547,790	$ 585,229	$ 558,390
Price-risk management and other, net	1,666	(828)	3,096
Total Revenues	549,456	584,401	561,486
Costs and Expenses:
General and administrative, net	39,629	45,423	47,097
Depreciation, depletion, and amortization	267,590	252,769	249,344
Accretion of asset retirement obligation	5,712	6,181	5,121
Lease operating cost	93,214	99,731	97,835
Transportation and gas processing	21,140	21,044	19,467
Severance and other taxes	37,038	42,725	47,546
Interest expense, net	73,207	69,382	57,303
Write-down of oil and gas properties	445,396	46,948	0
Total Costs and Expenses	982,926	584,203	523,713
Income from Continuing Operations Before Income Taxes	(433,470)	198	37,773
Provision (Benefit) for Income Taxes	(150,043)	2,640	16,072
Net Income (Loss)	$ (283,427)	$ (2,442)	$ 21,701
Per Share Amounts-
Earnings Per Share, Basic	$ (6.47)	$ (0.06)	$ 0.51
Earnings Per Share, Diluted	$ (6.47)	$ (0.06)	$ 0.50
Weighted Average Shares Outstanding - Basic	43,795	43,331	42,840
Weighted Average Shares Outstanding - Diluted	43,795	43,331	43,174