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Risks and uncertainties (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Loans and notes receivable from distributors, allowances for uncollectible accounts [Line Items]        
Loans and notes receivable from distributors $ 21,729 $ 37,076    
Loans and notes receivable from distributors [Member]        
Loans and notes receivable from distributors, allowances for uncollectible accounts [Line Items]        
Allowance for uncollectible accounts $ 2,837 $ 3,995 $ 4,278 $ 284