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Risks and uncertainties (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Dec. 31, 2019
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Loans and notes receivable from distributors, allowances for uncollectible accounts [Line Items] |  |  |  |
Loans and notes receivable from distributors | $ 28,581 | $ 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 | $ 3,337 | $ 3,995 | $ 11,656 | $ 284

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