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DEBT - Summary of Debt (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Finance leases $ 1,132  
Less: Deferred financing costs (1,629) $ (2,334)
Total debt 525,263 504,674
Less: Current portion of long-term debt (5,879) (3,179)
Long-term debt, net of current portion 519,384 501,495
First Lien Note Facility, net of unamortized discount    
Debt Instrument [Line Items]    
Long-term debt 207,209 198,962
Second Lien Note Facility, net of unamortized discount    
Debt Instrument [Line Items]    
Long-term debt 120,017 108,931
2021 Notes    
Debt Instrument [Line Items]    
Long-term debt 198,534 198,125
Finance leases    
Debt Instrument [Line Items]    
Finance leases $ 1,132 $ 990