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INCOME TAXES - Schedule of Income Tax Expense (Benefit) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Current:      
Federal $ 561 $ (200) $ 12
State 128 115 24
Foreign 2,198 1,960 1,378
Total current 2,887 1,875 1,414
Deferred:      
Federal (8,481) 49,570 (301)
State (1,414) (4,833) (1,007)
Foreign (1,477) (816) 338
Change in valuation allowance 11,885 (64,236) 2,072
Total deferred 513 (20,315) 1,102
Total $ 3,400 $ (18,440) $ 2,516