Basis of Presentation and Significant Accounting Policies - Excess and Obsolete Inventory Allowance Activity (Details) - USD ($) $ in Thousands	4 Months Ended	8 Months Ended	12 Months Ended
	Dec. 31, 2017	Aug. 31, 2017	Dec. 31, 2016
Inventory Adjustments [Roll Forward]
Balance, beginning of period	$ 0
Adjustments to provision	1,736
Charges against allowance	(56)
Fresh-start accounting adjustment	0
Balance, end of period	1,680	$ 0
Predecessor
Inventory Adjustments [Roll Forward]
Balance, beginning of period	$ 0	7,877	$ 13,075
Adjustments to provision		(945)	5,857
Charges against allowance		(1,661)	(11,055)
Fresh-start accounting adjustment		(5,271)	0
Balance, end of period		$ 0	$ 7,877