SEGMENT REPORTING - Reconciliation of Operating Income to Consolidated Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Adjustment for:
Amortization of intangible assets			$ 11,423	$ 12,575
Income from operations	$ 21,717	$ 16,813	59,380	48,022
Interest expense	4,986	4,781	14,911	15,959
Other income, net	(25)	120	127	(1,318)
Income before income taxes	16,756	11,912	44,342	33,381
Operating Segments
Segment Reporting Information, Operating Income (Loss) [Abstract]
Operating income for reportable segments	38,278	33,249	107,185	94,658
Segment Reconciling Items
Adjustment for:
Amortization of intangible assets	3,806	4,098	11,424	12,575
Corporate
Adjustment for:
Corporate expenses	$ 12,755	$ 12,338	$ 36,381	$ 34,061