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INCOME TAXES - Components of Income Before Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Domestic $ 46,270 $ 13,183 $ 11,079
Foreign 2,436 3,709 (1,405)
Total income before taxes $ 48,706 $ 16,892 $ 9,674