Income Taxes - Components of Income Tax (Benefit) Expense (Details) - USD ($) $ in Thousands	4 Months Ended	8 Months Ended	12 Months Ended
	Dec. 31, 2017	Aug. 31, 2017	Dec. 31, 2016
Federal
Federal current	$ 0
Federal deferred	(3,106)
State
State current	0
State deferred	(316)
Foreign
Foreign current	249
Foreign deferred	(15)
Income tax benefit	$ (3,188)
Predecessor
Federal
Federal current		$ 0	$ 0
Federal deferred		(1,412)	(4,231)
State
State current		25	25
State deferred		0	(114)
Foreign
Foreign current		953	1,783
Foreign deferred		(953)	(9)
Income tax benefit		$ (1,387)	$ (2,546)