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LONG-TERM DEBT - Long-Term Debt Balances (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Total debt and finance lease obligations $ 333,075 $ 312,496
Finance lease obligations 5,093 5,153
Current portion of long-term debt and finance lease obligations (352) (337)
Total long-term debt and finance lease obligations, less current portion 332,723 312,159
Secured Debt    
Debt Instrument [Line Items]    
Total debt and finance lease obligations 242,682 222,809
Secured Debt | Term Loan1    
Debt Instrument [Line Items]    
Total debt and finance lease obligations 214,682 213,809
Convertible debt    
Debt Instrument [Line Items]    
Total debt and finance lease obligations 85,300 84,534
Revolving Credit Facility | ABL Facility    
Debt Instrument [Line Items]    
Total debt and finance lease obligations $ 28,000 $ 9,000