INTANGIBLE ASSETS - Narrative (Details) - USD ($)	3 Months Ended	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	$ 526,257,000		$ 526,257,000		$ 523,998,000
Write-down of goodwill			1,228,000
Amortization of identifiable intangible assets	6,911,000	$ 6,753,000	20,875,000	$ 18,723,000
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	6,911,000		6,911,000
2021	24,216,000		24,216,000
2022	22,266,000		22,266,000
2023	19,351,000		19,351,000
2024	10,658,000		10,658,000
2025	$ 6,412,000		$ 6,412,000

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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