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Receivables - Narrative (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Other receivables $ 6,898 $ 5,807
Foreign    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Other receivables $ 5,100 $ 4,400