Significant Accounting Policies (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($) $ / Mcfe $ / bbl $ / Mcf shares	Mar. 31, 2015 USD ($) $ / Mcfe $ / bbl $ / Mcf shares	Dec. 31, 2015 USD ($)
Liabilities Subject to Compromise
Accounts payable	$ 23,649		$ 23,655
Accrued liabilities	12,522		12,108
Accrued interest payable	74,222		74,222
Debt	2,752,149		2,752,149
Other short-term liabilities	9,400		9,400
Legal and terminated contracts	36,596		36,596
Liabilities subject to compromise	2,908,538		$ 2,908,130
Reorganization Items, net
Professional fees	29,388
Interest	(14)
Total Reorganization items, net	$ 29,374
Loss per Share
Number of potential common shares included in computation of diluted per share amount because deemed antidilutive | shares	0	0
Oil and Gas Properties
Oil and Natural Gas Properties and Equipment
Impairment charges	$ 86,000	$ 236,500
Depletion of oil and gas properties	$ 19,100	$ 53,200
Depletion (per Mcfe) | $ / Mcfe	0.90	1.94
Natural Gas | Oil and Gas Properties
Oil and Natural Gas Properties and Equipment
Average unweighted first day of the month prices of proved reserves | $ / Mcf	2.39	3.88
Oil. | Oil and Gas Properties
Oil and Natural Gas Properties and Equipment
Average unweighted first day of the month prices of proved reserves | $ / bbl	46.26	82.72