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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
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items] |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) | $ 401 | $ 1,684
Commodity contracts | Principal Transaction Revenue | Futures |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) | (1,472) | (2,109)
Other contracts | Principal Transaction Revenue | ARS purchase commitments |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) | (467) | 1,698
Other contracts | Principal Transaction Revenue | TBAs |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) | (9) | (17)
Other contracts | Other | Options |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) |  | 10
Other contracts | Other | Interest rate lock commitments |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) | 1,884 | 7,632
Other contracts | Other | TBA sale agreements |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) | 440 | $ (5,530)
Other contracts | Other | Foreign currency forward contracts |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) | $ 25 |

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