INCOME TAXES - Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current income tax provision:
Federal	$ (2,044)	$ 964	$ (688)
State	1,640	342	341
Foreign	28,293	26,527	34,659
Current income tax provision	27,889	27,833	34,312
Deferred income tax benefit:
Federal	21,750	(8,367)	(14,027)
State	(11,575)	(10,345)	(2,343)
Foreign	(5,190)	(896)	(6,635)
Deferred income tax benefit	4,985	(19,608)	(23,005)
Income tax (benefit) provision	$ 32,874	$ 8,225	$ 11,307