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DEBT Summary of Long-term Debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Long-term debt $ 510,228 $ 510,699
Less: unamortized discount and fees (5,591) (5,801)
Less: current portion (1,880) (1,880)
Long-term debt 502,757 503,018
Senior notes due 2025    
Debt Instrument [Line Items]    
Long-term debt 325,000 325,000
Term loan credit agreement    
Debt Instrument [Line Items]    
Long-term debt $ 185,228 $ 185,699