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INCOME TAXES - Reconciliation of Tax Contingencies (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Contingency [Line Items]
Balance at beginning of period	$ 13,009	$ 13,162	$ 15,990
Additions based on tax positions taken during a prior period	219	484	94
Reductions based on tax positions taken during a prior period		(4,295)	(153)
Reductions related to a lapse of applicable statute of limitations	(3,555)	(821)	(3,144)
Reductions related to a settlement with taxing authorities			(382)
Balance at end of period	$ 9,673	13,009	13,162
Acquisitions [Member]
Income Tax Contingency [Line Items]
Additions based on tax positions taken during a prior period		$ 4,479	$ 757

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