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Debt - ABL Credit Facility (Details) - Revolving Credit Facility - USD ($)
Jun. 30, 2021
Dec. 31, 2020
ABL Revolver    
Debt Instrument [Line Items]    
Outstanding receivable advance balance $ 0  
Line of credit facility, borrowing base 85,000,000.0  
ABL Credit Facility due 2022    
Debt Instrument [Line Items]    
Letters of credit outstanding, amount $ 19,500,000 $ 1,700,000