INCOME TAXES - Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current income tax provision (benefit):
Federal	$ (43)		$ (443)
State	819	$ (20)	21
Foreign	806	905	(334)
Current income tax provision (benefit)	1,582	885	(756)
Deferred income tax benefit
Federal	(3,416)	(5,549)	(38,587)
State	517	(1,100)	(8,467)
Foreign	(351)	(1,719)	(1,296)
Deferred income tax benefit	(3,250)	(8,368)	(48,350)
Income tax benefit	$ (1,668)	$ (7,483)	$ (49,106)