INCOME TAXES - Components of Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current:
Federal	$ (6,551)	$ 3,505	$ 3,739
State	49	381	498
Foreign	4,124	4,479	3,788
Total current	(2,378)	8,365	8,025
Deferred:
Federal	(3,622)	(12,481)	2,646
State	(1,719)	(1,442)	380
Foreign	886	(858)	(2,598)
Total deferred	(4,455)	(14,781)	428
Provision (Benefit) for income taxes	$ (6,833)	$ (6,416)	$ 8,453