Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenues:
Oil and gas sales	$ 246,270	$ 547,790	$ 585,229
Price-risk management and other, net	(1,549)	1,666	(828)
Total Revenues	244,721	549,456	584,401
Costs and Expenses:
General and administrative, net	42,611	39,629	45,423
Depreciation, depletion, and amortization	177,512	267,590	252,769
Accretion of asset retirement obligation	5,572	5,712	6,181
Lease operating cost	70,188	93,214	99,731
Transportation and gas processing	21,741	21,140	21,044
Severance and other taxes	17,090	37,038	42,725
Interest expense, net	75,870	73,207	69,382
Write-down of oil and gas properties	1,562,086	445,396	46,948
Reorganization items	6,565	0	0
Total Costs and Expenses	1,979,235	982,926	584,203
Income (Loss) Before Income Taxes	(1,734,514)	(433,470)	198
Provision (Benefit) for Income Taxes	(80,543)	(150,043)	2,640
Net Income (Loss)	$ (1,653,971)	$ (283,427)	$ (2,442)
Per Share Amounts-
Earnings (Loss) Per Share, Basic	$ (37.20)	$ (6.47)	$ (0.06)
Earnings (Loss) Per Share, Diluted	$ (37.20)	$ (6.47)	$ (0.06)
Weighted Average Shares Outstanding - Basic	44,463	43,795	43,331
Weighted Average Shares Outstanding - Diluted	44,463	43,795	43,331