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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) | $ (1,010) | $ 321 | $ 47 | $ (7,647)
Commodity Contracts | Principal Transaction Revenue | Future [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) | (525) | (252) | 495 | (8,346)
Other Contracts | Principal Transaction Revenue | TBAs |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) | 14 | (2) | 51 | (14)
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) | $ (1) | 555 | (1) | 691
Other Contracts | Principal Transaction Revenue | Purchase Commitment |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) |  |  | (490) |
Other Contracts | Other Income [Member] | Foreign exchange forward contracts |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) |  | $ 20 | $ (8) | $ 22

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