Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	4 Months Ended	8 Months Ended	12 Months Ended
	Dec. 31, 2017	Aug. 31, 2017	Dec. 31, 2016
Operating Loss Carryforwards [Line Items]
Federal income tax at statutory rates	$ (5,780)
State income taxes, net of federal income tax benefits	(2,871)
Section 956 inclusions	294
Convertible debt – non-deductible	0
Intercompany bad debt deduction	(11,680)
Other permanent differences	943
Federal and state income tax on joint venture	0
Rate differential on foreign income	(34)
Valuation allowance	19,157
Discrete impact of the Tax Act	(4,799)
Other	1,582
Income tax benefit	$ (3,188)
Effective income tax (benefit) rate (as a percent)	19.30%
Predecessor
Operating Loss Carryforwards [Line Items]
Federal income tax at statutory rates		$ 12,181	$ (39,361)
State income taxes, net of federal income tax benefits		(2,347)	(5,118)
Section 956 inclusions		2,132	13,132
Convertible debt – non-deductible		(29,903)	3,024
Intercompany bad debt deduction		0	0
Other permanent differences		1,941	2,719
Federal and state income tax on joint venture		0	(1,660)
Rate differential on foreign income		(490)	795
Valuation allowance		15,771	23,746
Discrete impact of the Tax Act		0	0
Other		(672)	177
Income tax benefit		$ (1,387)	$ (2,546)
Effective income tax (benefit) rate (as a percent)		(4.00%)	2.30%