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INCOME TAXES - Components of Income (Loss) before Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Components of income before income taxes [Abstract]      
United States $ 69,595 $ 54,338 $ 60,485
Foreign (997) (21,279) (1,158)
INCOME BEFORE INCOME TAXES $ 68,598 $ 33,059 $ 59,327