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LONG-TERM DEBT - Components of Long-term Debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Borrowings [Abstract]    
Less: current portion $ (3,300) $ (3,300)
Unamortized debt issuance costs 8,300 9,600
Carrying Value    
Borrowings [Abstract]    
Total long-term debt 327,525 330,000
Less: current portion (3,300) (3,300)
Long-term debt less current maturities 324,225 326,700
Carrying Value | ABL Revolver    
Borrowings [Abstract]    
Total long-term debt 0 0
Carrying Value | Term Loan B    
Borrowings [Abstract]    
Total long-term debt 327,525 330,000
Fair Value    
Borrowings [Abstract]    
Total long-term debt 325,887 325,875
Less: current portion (3,284) (3,259)
Long-term debt less current maturities 322,603 322,616
Fair Value | ABL Revolver    
Borrowings [Abstract]    
Total long-term debt 0 0
Fair Value | Term Loan B    
Borrowings [Abstract]    
Total long-term debt $ 325,887 $ 325,875