Fresh Start Accounting - Summary of Excess Reorganization Value Fair Value of Identified Tangible and Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Sep. 02, 2016		Aug. 31, 2016
Fresh Start Adjustment [Line Items]
Predecessor, Accumulated depreciation, depletion and amortization	$ (2,810,139)
Fresh Start Adjustments, Accumulated depreciation, depletion and amortization	2,810,139
Predecessor, Property, plant and equipment, net	1,154,866			$ 1,154,866
Fresh-Start Adjustment, Property, plant and equipment, net	(396,661)	$ (396,661)	[1]
Successor, Property, plant and equipment, net	758,205	$ 758,205
Predecessor, total natural gas and oil properties	3,965,005
Fresh Start Adjustment, total natural gas and oil properties	(3,206,800)
Successor, total natural gas and oil properties	758,205
Proved properties
Fresh Start Adjustment [Line Items]
Predecessor, total natural gas and oil properties	3,620,371
Fresh Start Adjustment, total natural gas and oil properties	(2,950,427)
Successor, total natural gas and oil properties	669,944
Unproved properties
Fresh Start Adjustment [Line Items]
Predecessor, total natural gas and oil properties	213,047
Fresh Start Adjustment, total natural gas and oil properties	(138,613)
Successor, total natural gas and oil properties	74,434
Support equipment and other
Fresh Start Adjustment [Line Items]
Predecessor, total natural gas and oil properties	131,587
Fresh Start Adjustment, total natural gas and oil properties	(117,760)
Successor, total natural gas and oil properties	$ 13,827

[1] Reflects the adjustment made to record the elimination of $9.6 million of the old first lien credit facility deferred financing costs offset by the recognition of $2.5 million in additional deferred financing costs related to the new First Lien Credit Facility.