Segment Reporting - Reconciliation of EBITDA from Continuing Operations to "Net income (loss) from continuing operations" (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Reconciliation of total segment EBITDA to income before taxes
Total segment EBITDA from continuing operations									$ 41,215	$ 22,698
Interest, net									(24,891)	(23,431)
Income tax (expense) benefit									(3,652)	4,339
Depreciation and amortization									(17,002)	(18,405)
Net loss from continuing operations	$ (2,129)	$ (656)	$ 1,552	$ (3,097)	$ (7,235)	$ (1,085)	$ (802)	$ (5,677)	$ (4,330)	$ (14,799)