INCOME TAXES - Components of Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current income tax (expense) benefit:
Federal	$ (14,773)	$ (20,108)	$ (9,097)
State	(568)	(755)	(511)
Foreign	(19,262)	(16,514)	(8,677)
Current income tax benefit (expense)	(34,603)	(37,377)	(18,285)
Deferred income tax (expense) benefit:
Federal	4,883	5,208	12,622
State	(34)	1,054	611
Foreign	(403)	(486)	(419)
Deferred income tax expense, gross	4,446	5,776	12,814
Income tax expense	$ (30,157)	$ (31,601)	$ (5,471)