INTANGIBLE ASSETS - Narrative (Details) - USD ($)	3 Months Ended	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	$ 522,929,000		$ 522,929,000		$ 523,998,000
Write-down of goodwill			1,228,000
Amortization of identifiable intangible assets	6,985,000	$ 6,128,000	13,964,000	$ 11,970,000
Identifiable intangible assets with indefinite useful lives	0	$ 0	0	$ 0
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Remainder of 2020	13,730,000		13,730,000
2021	24,033,000		24,033,000
2022	22,101,000		22,101,000
2023	19,192,000		19,192,000
2024	10,508,000		10,508,000
2025	$ 6,271,000		$ 6,271,000

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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