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INCOME TAXES - Components of Income Tax Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Current income tax benefit (expense):      
Federal $ (4,485) $ (1,018)  
State (47) (2) $ (2)
Foreign (12,902) (10,224) (8,363)
Current income tax benefit (expense) (17,434) (11,244) (8,365)
Deferred income tax (expense) benefit:      
Federal (2,683) (7,145) (9,652)
State (503) 51 575
Foreign 92 (43) (31)
Deferred income tax expense, gross (3,094) (7,137) (9,108)
Income tax expense $ (20,528) $ (18,381) $ (17,473)