Fresh Start Accounting - Summary of Reorganization Items Net (Details) - USD ($) $ in Thousands	4 Months Ended		12 Months Ended
	Dec. 31, 2016	[1]	Dec. 31, 2016
Reorganizations [Abstract]
Professional fees and other			$ (33,065)
Accelerated amortization of deferred financing costs			(9,565)
Net gain on reorganization adjustments			361,479
Net loss on fresh start adjustments			(335,463)
Total reorganization items, net	$ (870)		$ (16,614)

[1] Gain (loss) on asset sales and disposal, reorganization items, net, gain on early extinguishment of debt, interest expense and income tax (expense) benefit have not been allocated to reportable segments as it would be impracticable to reasonably do so for the periods presented.