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LONG-TERM DEBT - Long-Term Debt Balances (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Total debt and finance lease obligations $ 363,628 $ 312,496
Finance lease obligations 5,792 5,153
Current portion of long-term debt and finance lease obligations (663) (337)
Total long-term debt and finance lease obligations, less current portion 362,965 312,159
Secured Debt    
Debt Instrument [Line Items]    
Total debt and finance lease obligations 270,977 222,809
Secured Debt | Term Loan    
Debt Instrument [Line Items]    
Total debt and finance lease obligations [1] 216,877 213,809
Convertible debt    
Debt Instrument [Line Items]    
Total debt and finance lease obligations [1] 86,859 84,534
Revolving Credit Facility | ABL Facility    
Debt Instrument [Line Items]    
Total debt and finance lease obligations $ 54,100 $ 9,000
[1] Comprised of principal amount outstanding, less unamortized discount and issuance costs.