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DEBT - Total Availability Under ABL Agreement (Details) - ABL Credit Agreement - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Maximum aggregate principal allowed $ 150,000 $ 150,000
Outstanding borrowings under the ABL Agreement 0 (27,302)
Standby letters of credit (3,391) (2,698)
Total availability under the ABL Agreement $ 146,609 $ 120,000