Income Taxes Income Taxes - Summary of Uncertain Tax Positions (Details) - USD ($) $ in Thousands	5 Months Ended	7 Months Ended	12 Months Ended
	Dec. 31, 2015	Jul. 31, 2015	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning Balance	$ 0		$ 0	$ 0
Additions of tax positions of the current year	0		0	0
Additions to tax positions of the prior years	0		2,884	0
Reductions of tax positions of the prior years	0		0	0
Settlements with taxing authorities	0		0	0
Expiration of statutes of limitations	0		0	0
Provision (benefit) for income taxes	0	$ 0	$ 2,884	$ 0
Predecessor
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning Balance	$ 0	0
Additions of tax positions of the current year		0
Additions to tax positions of the prior years		0
Reductions of tax positions of the prior years		0
Settlements with taxing authorities		0
Expiration of statutes of limitations		0
Provision (benefit) for income taxes		$ 0