INCOME TAXES - Schedule of Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current
U.S. federal	$ 2	$ 2	$ 261
State	(122)	37	(38)
Foreign	(1,542)	(1,914)	(245)
Total Current	(1,662)	(1,875)	(22)
Deferred
U.S. federal	465	3,803	13,028
State	17	146	0
Foreign	(11,278)	(23,360)	(21,659)
Total Deferred	(10,796)	(19,411)	(8,631)
Changes in valuation allowance	(482)	(3,950)	(13,028)
Income tax (expense) benefit	$ (12,940)	$ (25,236)	$ (21,681)