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INCOME TAXES - Components of Income Tax Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Current income tax expense:      
Federal $ (20,108) $ (9,097) $ (5,817)
State (755) (511) (54)
Foreign (16,514) (8,677) (15,406)
Current income tax benefit (expense) (37,377) (18,285) (21,277)
Deferred income tax benefit (expense):      
Federal 5,208 12,622 (24,425)
State 1,054 611 (23)
Foreign (486) (419) 73
Deferred income tax expense, gross 5,776 12,814 (24,375)
Income tax expense $ (31,601) $ (5,471) $ (45,652)