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DEBT - Long-term Debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Long-term debt, gross $ 423,835 $ 453,835
Less: unamortized discount and fees (4,705) (5,856)
Less: current portion 0 0
Long-term debt 419,130 447,979
Senior Notes due 2025    
Debt Instrument [Line Items]    
Long-term debt, gross 315,000 315,000
New Term Loan Credit Agreement due 2027    
Debt Instrument [Line Items]    
Long-term debt, gross $ 108,835 $ 138,835