Long-Term Debt - Schedule Of Interest Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Cash payments for interest	$ 25,616
Commitment and other fees paid	442
Amortization of discount on term loan and capital leases, and debt issuance costs	7,527
Change in accrued interest	4,440
Capitalized interest	(660)
Other	107
Total interest expense	$ 37,472
Predecessor
Debt Instrument [Line Items]
Cash payments for interest		$ 49,621	$ 61,587
Commitment and other fees paid		2,898	2,484
Amortization of discount on term loan and capital leases, and debt issuance costs		9,295	3,362
Change in accrued interest		34,719	563
Capitalized interest		0	(139)
Other		92	107
Total interest expense		$ 96,625	$ 67,964