Segment Information - Reconciliation of EBITDA to Net Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting [Abstract]
EBITDA	$ 212,351	$ 191,489	$ 153,594
Less
Income tax expense	12,975	12,596	4,780
Interest expense, net	27,594	29,257	29,145
Depreciation and amortization	68,082	63,067	64,250
Net income	$ 103,700	$ 86,569	$ 55,419