INCOME TAXES - Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current income tax provision (benefit) :
Federal		$ (443)	$ 13,440
State	$ (20)	21	2,274
Foreign	905	(334)	(161)
Current income tax provision (benefit)	885	(756)	15,553
Deferred income tax benefit
Federal	(5,549)	(38,587)	(2,483)
State	(1,100)	(8,467)	(775)
Foreign	(1,719)	(1,296)	(461)
Deferred income tax benefit	(8,368)	(48,350)	(3,719)
Income tax (benefit) provision	$ (7,483)	$ (49,106)	$ 11,834