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Fair Value Measurements - Fair Value Amounts of Derivative Instruments and their Effect on Statement of Operations (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items] |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) | $ (132) | $ 282
Commodity Contracts | Principal Transaction Revenue |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) | 592 | 987
Other Contracts | Principal Transaction Revenue | ERROR in label resolution. |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) | 371 | (167)
Other Contracts | Other | Foreign exchange forward contracts |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) | (7) | 12
Other Contracts | Other | Other TBAs (2) |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) |  | (338)
Other Contracts | Auction Rate Securities Purchase Commitment | Principal Transaction Revenue |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) | $ (1,088) | $ (212)

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