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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, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) | $ (525) | $ 175 | $ (368) | $ (7,473)
Commodity Contracts | Principal Transaction Revenue | Future [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) | (13) | (15) | 482 | (8,362)
Other Contracts | Principal Transaction Revenue | TBAs |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) | (15) | (17) | 146 | (31)
Other Contracts | Principal Transaction Revenue | Auction Rate Securities Purchase Commitment |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) |  | 140 | (1) | 831
Other Contracts | Principal Transaction Revenue | Purchase Commitment |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) | $ (497) |  | (987) |
Other Contracts | Other Income [Member] | Foreign exchange forward contracts |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) |  | $ 67 | $ (8) | $ 89

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