INCOME TAXES - SCHEDULE OF INCOME TAX CONTINGENCIES (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning balance January 1	$ 54	$ 1,293	$ 4,348
Additions based on tax positions related to the current year	14,009	0	0
Unrecognized Tax Benefits, Increase Resulting from Acquisition	68,048	0	0
Reductions for tax positions of prior years	(43)	0	0
Settlements	0	(1,290)	(2,646)
Lapse in statute of limitations	(15,886)	0	(287)
Unrecognized Tax Benefits, Increase Resulting from Foreign Currency Translation	1,893	51
Unrecognized Tax Benefits, Decrease Resulting from Foreign Currency Translation			(122)
Ending balance December 31	$ 68,075	$ 54	$ 1,293