Bankruptcy Related Disclosures - Schedule of Reorganization Items Incurred (Details) - USD ($) $ in Thousands	1 Months Ended	2 Months Ended		3 Months Ended	8 Months Ended	9 Months Ended
	Sep. 30, 2017	Aug. 31, 2017	Aug. 31, 2017	Sep. 30, 2016	Aug. 31, 2017	Sep. 30, 2016
Fresh-Start Adjustment [Line Items]
Gain on extinguishment of debt	$ 0
Gain on fresh-start revaluation	0
Write-off of unamortized debt issuance costs and discounts	0
Prepayment penalties and debt-related fees	0
Professional fees	128
Key employee incentive plan	0
Reorganization items, net	$ 128
Predecessor
Fresh-Start Adjustment [Line Items]
Gain on extinguishment of debt		$ (89,989)	$ (89,989)
Gain on fresh-start revaluation		(16,566)	(16,566)
Write-off of unamortized debt issuance costs and discounts		10,262	5,412
Prepayment penalties and debt-related fees		13,191	13,191
Professional fees		7,342	6,690
Key employee incentive plan		1,229	1,229
Reorganization items, net		(74,531)	$ (80,033)	$ 0	$ (74,531)	$ 0
Cash payment professional fees		8,571
Cash used in debtor-in-possession financing costs		$ 3,673