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Fair value measurements - Fair Value Amounts of Derivative Instruments and their Effect on Statement of Operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) | $ 1,103 | $ 350 | $ 4,872 | $ 3,905
Commodity contracts | Principal Transaction Revenue | Futures |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) | 1,078 | 349 | 4,817 | 3,868
Other contracts | Principal Transaction Revenue | TBAs |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) | $ 25 | $ 1 | 63 | 57
Other contracts | Other | Foreign exchange forward contracts |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) |  |  | $ (8) | $ (20)

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