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INCOME TAXES - Components of Income (Loss) before Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Components of income before income taxes [Abstract]      
United States $ 100,260 $ 69,595 $ 54,338
Foreign 49,277 (997) (21,279)
INCOME BEFORE INCOME TAXES $ 149,537 $ 68,598 $ 33,059