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DEBT - Summary of Debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Finance leases $ 1,420  
Less: Deferred financing costs (1,983) $ (2,334)
Total debt 511,255 504,674
Less: Current portion of long-term debt (4,536) (3,179)
Long-term debt, net of current portion 506,719 501,495
First Lien Note Facility, net of unamortized discount    
Debt Instrument [Line Items]    
Long-term debt 199,120 198,962
Second Lien Note Facility, net of unamortized discount    
Debt Instrument [Line Items]    
Long-term debt 114,372 108,931
2021 Notes    
Debt Instrument [Line Items]    
Long-term debt 198,326 198,125
Finance leases    
Debt Instrument [Line Items]    
Finance leases $ 1,420 $ 990