INTANGIBLE ASSETS (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	$ 447,995,000	$ 441,361,000	$ 439,811,000
Identifiable intangible assets [Abstract]
Gross carrying amount	260,370,000	257,495,000
Accumulated amortization	154,385,000	129,422,000
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]
Amortization of identifiable intangible assets	24,988,000	26,784,000	$ 29,768,000
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2019	22,928,000
2020	20,870,000
2021	17,639,000
2022	16,156,000
2023	14,861,000
Indefinite-lived intangible assets	$ 0	0
Customer relationships and lists
Identifiable intangible assets [Abstract]
Amortization period	10 years
Gross carrying amount	$ 192,185,000	190,061,000
Accumulated amortization	122,545,000	105,573,000
Trademarks & trade names
Identifiable intangible assets [Abstract]
Gross carrying amount	39,934,000	40,630,000
Accumulated amortization	$ 16,755,000	12,895,000
Trademarks & trade names | Minimum
Identifiable intangible assets [Abstract]
Amortization period	5 years
Trademarks & trade names | Maximum
Identifiable intangible assets [Abstract]
Amortization period	17 years
Developed technology
Identifiable intangible assets [Abstract]
Amortization period	5 years
Gross carrying amount	$ 13,338,000	13,338,000
Accumulated amortization	8,604,000	5,936,000
Other
Identifiable intangible assets [Abstract]
Gross carrying amount	14,913,000	13,466,000
Accumulated amortization	$ 6,481,000	$ 5,018,000
Other | Minimum
Identifiable intangible assets [Abstract]
Amortization period	3 years
Other | Maximum
Identifiable intangible assets [Abstract]
Amortization period	18 years