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INCOME TAXES - Components of Income Tax Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current income tax benefit (expense):      
Federal $ (5,817) $ (4,485) $ (1,018)
State (54) (47) (2)
Foreign (15,406) (12,902) (10,224)
Current income tax benefit (expense) (21,277) (17,434) (11,244)
Deferred income tax (expense) benefit:      
Federal (24,425) (2,683) (7,145)
State (23) (503) 51
Foreign 73 92 (43)
Deferred income tax expense, gross (24,375) (3,094) (7,137)
Income tax expense $ (45,652) $ (20,528) $ (18,381)