INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
INTANGIBLE ASSETS [Abstract]
Goodwill	$ 449,015	$ 441,361
Identifiable intangible assets [Abstract]
Gross carrying amount	258,969	257,495
Accumulated amortization	147,827	129,422
Amortization of identifiable finite-lived intangible assets [Abstract]
Amortization of identifiable intangible assets	18,680
Finite-lived intangible assets, future amortization expense [Abstract]
Remainder of 2018	6,246
2019	22,676
2020	20,644
2021	17,437
2022	15,979
2023	14,737
Indefinite-lived intangible assets	$ 0
Customer Relationships & Lists [Member]
Identifiable intangible assets [Abstract]
Amortization period	10 years
Gross carrying amount	$ 191,274	190,061
Accumulated amortization	118,230	105,573
Trademarks & Trade Names [Member]
Identifiable intangible assets [Abstract]
Gross carrying amount	40,471	40,630
Accumulated amortization	$ 15,606	12,895
Trademarks & Trade Names [Member] | Minimum [Member]
Identifiable intangible assets [Abstract]
Amortization period	5 years
Trademarks & Trade Names [Member] | Maximum [Member]
Identifiable intangible assets [Abstract]
Amortization period	17 years
Developed Technology [Member]
Identifiable intangible assets [Abstract]
Amortization period	5 years
Gross carrying amount	$ 13,338	13,338
Accumulated amortization	7,937	5,936
Other [Member]
Identifiable intangible assets [Abstract]
Gross carrying amount	13,886	13,466
Accumulated amortization	$ 6,054	$ 5,018
Other [Member] | Minimum [Member]
Identifiable intangible assets [Abstract]
Amortization period	3 years
Other [Member] | Maximum [Member]
Identifiable intangible assets [Abstract]
Amortization period	18 years