Bankruptcy Related Disclosures Bankruptcy Related Disclosures - Schedule of Reorganization Items (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, 2018	Aug. 31, 2017	Sep. 30, 2018
Schedule of Reorganization Items, Net [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 of penalties and debt-related fees	0
Professional fees	128
Key employee incentive plan	0
Reorganization items, net	$ 128	[1]			$ 0		$ 0
Predecessor
Schedule of Reorganization Items, Net [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			5,412	10,262
Prepayment of penalties and debt-related fees			13,191	13,191
Professional fees			6,690	7,342
Key employee incentive plan			1,229	1,229
Reorganization items, net			$ (80,033)	$ (74,531)		$ (74,531)

[1] * Adjusted due to the adoption of ASU No. 2017-07, "Compensation – Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost." See Note 3 - New Accounting Standards, for additional information.