Segment Reporting - Reconciliation of EBITDA to net income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Reconciliation of total segment EBITDA to income before taxes
Total segment EBITDA	$ 20,266	$ 17,489	$ 56,842	$ 38,290
Interest, net	(7,183)	(6,298)	(23,196)	(19,158)
Income tax (expense) benefit	(2,887)	(1,402)	(6,769)	2,178
Depreciation and amortization	(3,570)	(3,980)	(11,609)	(12,436)
Net loss from discontinued operations				(30)
Net income	$ 6,626	$ 5,809	$ 15,268	$ 8,844