Basis of Presentation and Significant Accounting Policies - Allowance for Doubtful Accounts Activity (Details) - USD ($) $ in Thousands	4 Months Ended	8 Months Ended	12 Months Ended
	Dec. 31, 2017	Aug. 31, 2017	Dec. 31, 2016
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance, beginning of period	$ 0
Add Provision charged to expense	1,735
Recoveries	13
Less Charges against allowance	(162)
Fresh-start accounting adjustment	0
Balance, end of period	1,586	$ 0
Predecessor
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance, beginning of period	$ 0	1,945	$ 2,380
Add Provision charged to expense		34	37
Recoveries		25	32
Less Charges against allowance		(316)	(504)
Fresh-start accounting adjustment		(1,688)	0
Balance, end of period		$ 0	$ 1,945