Income Taxes (Details) - USD ($) $ in Thousands	2 Months Ended	10 Months Ended	12 Months Ended
	Dec. 31, 2016	Oct. 20, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Taxes
Estimated Amount of Cancellation of Indebtedness Income			$ 1,200,000
Income (loss) before taxes	$ 9,930
Income tax payments expected in the upcoming four quarterly reporting periods			0
Valuation allowance	160,800		160,800
Decreased valuation allowance			532,600
Reconciliation of income tax expense
Income (loss) before taxes	$ 9,930
Statutory rate	35.00%
Income tax provision (benefit) computed at statutory rate	$ 3,475
Reconciling items:
State income taxes, net of federal benefit	296
Valuation allowance in light of the impairment of oil and gas properties	(3,876)
Change in state rate	(1)
Deferred tax true-ups	74
Other, net	32
Deferred tax assets - noncurrent
Employee benefit plans	3,649		3,649
Oil and gas properties and equipment	157,113		157,113
Other	27		27
Less valuation allowance	(160,789)		(160,789)
Property and equipment
Income Taxes
Valuation allowance	$ 157,100		$ 157,100
Predecessor
Income Taxes
Income (loss) before taxes		$ 1,323,079		$ (1,806,836)	$ 123,324
Current
State					809
Total current					809
Deferred
United States				(3,864)	3,863
State				(5,777)	1,723
Total deferred				(9,641)	5,586
Total income tax provision (benefit)				9,641	(6,395)
Reconciliation of income tax expense
Income (loss) before taxes		$ 1,323,079		$ (1,806,836)	$ 123,324
Statutory rate		35.00%		35.00%	35.00%
Income tax provision (benefit) computed at statutory rate		$ 463,078		$ (632,393)	$ 43,164
Reconciling items:
State income taxes, net of federal benefit		39,424		(65,904)	4,398
Valuation allowance in light of the impairment of oil and gas properties		(528,706)		689,419	(42,134)
Change in state rate		(153)		(612)	(414)
Bankruptcy items		12,262
Deferred tax true-ups		9,891
Other, net		$ 4,204		(151)	1,381
Total income tax provision (benefit)				(9,641)	$ 6,395
Deferred tax assets - noncurrent
Federal tax loss carryforwards				146,641
State tax loss carryforwards				13,848
Employee benefit plans				1,160
Oil and gas properties and equipment				465,028
Debt restructuring				66,693
Less valuation allowance				$ (693,370)