Significant Accounting Policies (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) $ / bbl $ / Mcf	Sep. 30, 2014 $ / bbl $ / Mcf
Liabilities Subject to Compromise
Accounts payable	$ (20,094,000)		$ (20,094,000)		$ (20,094,000)
Accrued liabilities	(10,341,000)		(10,341,000)		(10,341,000)
Accrued interest payable	(74,222,000)		(74,222,000)		(74,222,000)
Debt	(2,725,829,000)		(2,725,829,000)		(2,725,829,000)
Other short-term liabilities	(9,400,000)		(9,400,000)		(9,400,000)
Legal and terminated contracts	(36,530,000)		(36,530,000)		(36,530,000)
Liabilities subject to compromise	(2,876,416,000)		(2,876,416,000)		$ (2,876,416,000)
Reorganization Items, net
Professional fees	21,122,000		21,122,000
Deferred financing costs and unamortized discounts	378,705,000		378,705,000
Terminated contracts	33,132,000		33,132,000
Total Reorganization items, net	432,959,000		432,959,000
Oil and Gas Properties
Ceiling test impairment expense	570,500,000		1,300,000,000
Depletion of Oil and Gas Properties	47,100,000	$ 52,100,000	150,000,000	$ 141,000,000
Depletion (per Mcfe)	$ 1.92	$ 2.68	$ 1.90	$ 2.57
Natural Gas | Oil and Gas Properties
Average unweighted first day of the month prices of proved reserves | $ / Mcf					3.06	4.24
Oil. | Oil and Gas Properties
Average unweighted first day of the month prices of proved reserves | $ / bbl					59.21	99.08