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LONG-TERM DEBT - Components of Long Term Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Long-term debt $ 453,835 $ 460,228
Less: unamortized discount and fees (5,856) (4,842)
Less: current portion 0 0
Long-term debt 447,979 455,386
Senior Notes due 2025    
Debt Instrument [Line Items]    
Long-term debt 315,000 325,000
New Term Loan Credit Agreement    
Debt Instrument [Line Items]    
Long-term debt $ 138,835 $ 135,228