Emergence from WIMC Reorganization Proceedings - Additional Information (Details) - USD ($) $ in Thousands		1 Months Ended	11 Months Ended	12 Months Ended
	Feb. 09, 2018	Feb. 09, 2018	Dec. 31, 2018	Dec. 31, 2017	Feb. 10, 2018
Fresh-Start Adjustment [Line Items]
Cash payments made for reorganization items		$ 5,700	$ 11,800	$ 0
Enterprise value					$ 1,464,795
Minimum [Member]
Fresh-Start Adjustment [Line Items]
Enterprise value	$ 1,400,000	1,400,000
Implied Credit Spread	6.00%
Implied Yield	13.50%
Maximum [Member]
Fresh-Start Adjustment [Line Items]
Enterprise value	$ 1,500,000	$ 1,500,000
Implied Credit Spread	8.00%
Implied Yield	15.50%