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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, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) | $ 350 | $ (525) | $ 3,905 | $ (368)
Commodity contracts | Principal Transaction Revenue | Futures |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) | 349 | (13) | 3,868 | 482
Other contracts | Principal Transaction Revenue | TBAs |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) | $ 1 | (15) | 57 | 146
Other contracts | Principal Transaction Revenue | Purchase commitments |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) |  | $ (497) |  | (987)
Other contracts | Principal Transaction Revenue | ARS purchase commitments |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) |  |  |  | (1)
Other contracts | Other | Foreign exchange forward contracts |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) |  |  | $ (20) | $ (8)

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