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DEBT - Long-term Debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Long-term debt, gross $ 465,000 $ 460,228
Less: unamortized discount and fees (6,278) (4,842)
Less: current portion (1,500) 0
Long-term debt 457,222 455,386
Senior notes due 2025    
Debt Instrument [Line Items]    
Long-term debt, gross 315,000 325,000
Term loan credit agreement due 2027    
Debt Instrument [Line Items]    
Long-term debt, gross $ 150,000 $ 135,228