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DEBT - Schedule of Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Feb. 11, 2014
Debt Instrument [Line Items]      
Less: Deferred financing costs $ (2,334) $ (3,656)  
Total debt 504,674 480,588  
Less: Current portion of long-term debt (3,179) (1,722)  
Long-term debt, net of current portion 501,495 478,866  
First Lien Note Facility, net of unamortized discount      
Debt Instrument [Line Items]      
Long-term debt 198,962 198,324  
Second Lien Note Facility, net of unamortized discount      
Debt Instrument [Line Items]      
Long-term debt 108,931 85,694  
2021 Notes, net of unamortized discount      
Debt Instrument [Line Items]      
Long-term debt 198,125 197,363  
Less: Deferred financing costs     $ (500)
Capital leases      
Debt Instrument [Line Items]      
Long-term debt $ 990 $ 2,863