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DEBT - Long-term Debt (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Long-term debt, gross $ 495,228 $ 510,699
Less: unamortized discount and fees (5,363) (5,801)
Less: current portion 0 (1,880)
Long-term debt 489,865 503,018
Term loan credit agreement    
Debt Instrument [Line Items]    
Long-term debt, gross 170,228 185,699
Senior notes due 2025    
Debt Instrument [Line Items]    
Long-term debt, gross $ 325,000 $ 325,000