SEGMENT REPORTING, Reconciliation of operating Income to Consolidated Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Adjustment for [Abstract]
Amortization of intangible assets			$ 8,477	$ 8,607
Income from operations	$ 20,060	$ 10,257	31,209	18,493
Interest expense	6,137	3,992	11,178	7,645
Other (income) expense, net	(1,416)	57	(1,438)	(171)
Income before income taxes	15,339	6,208	21,469	11,019
Reportable Segment [Member]
Segment reporting information [Abstract]
Operating income for reportable segments	35,144	23,890	61,409	44,798
Adjustment for [Abstract]
Income from operations	31,025	19,599	52,932	36,191
Segment Reconciling Items [Member]
Adjustment for [Abstract]
Amortization of intangible assets	4,119	4,291	8,477	8,607
Corporate expenses	$ 10,965	$ 9,342	$ 21,723	$ 17,698