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INTANGIBLE ASSETS - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
INTANGIBLE ASSETS - Narrative (Details) - USD ($)	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	$ 506,852,000		$ 506,852,000		$ 447,995,000
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Amortization of identifiable intangible assets	6,128,000	$ 6,279,000	11,970,000	$ 12,472,000
Identifiable intangible assets with indefinite useful lives	0	$ 0	0	$ 0
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Remainder of 2019	13,534,000		13,534,000
2020	24,882,000		24,882,000
2021	21,151,000		21,151,000
2022	19,277,000		19,277,000
2023	17,860,000		17,860,000
2024	9,332,000		9,332,000
Discontinued Operations, Held-for-sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Amount of goodwill reclassified to assets held for sale	$ 1,380,000		$ 1,380,000