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Allowance for credit losses - Narrative (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 USD ($) category | Dec. 31, 2023 USD ($) category
Credit Loss [Abstract] |  |
Financing receivable, allowance for credit loss, period increase (decrease) | $ 177,000 |
Current period increase (decrease) in provision for expected credit losses | 177,102 | $ 4,022
Write-offs charged against the allowance | $ 0 | $ 107,996
Number of categories of financing receivables | category | 3 | 3

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