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DEBT - Schedule of Interest Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Debt Disclosure [Abstract]      
Interest expense on Credit Agreement $ 9,064 $ 8,986 $ 3,773
Amortization of deferred financing costs 861 861 659
Total interest expense $ 9,925 $ 9,847 $ 4,432