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Summary of Significant Accounting Policies - Accounts Receivable (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Accounts Receivable, after Allowance for Credit Loss, Current [Abstract]    
Customer receivables $ 164,260 $ 97,723
Other receivables 812 710
Rebates receivable 5,145 1,569
Allowance for credit losses (7,248) (4,861)
Total $ 162,969 $ 95,141