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DEBT - Total Availability Under ABL Agreement (Details) - ABL Credit Agreement - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Maximum aggregate principal allowed $ 150,000 $ 150,000
Outstanding borrowings under the ABL Agreement (1,600) (27,302)
Standby letters of credit (3,311) (2,698)
Total availability under the ABL Agreement $ 145,089 $ 120,000