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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, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) | $ 179 | $ 12,629 | $ 1,700 | $ 3,935
Commodity Contracts [Member] | Future [Member] | Principal Transaction Revenue [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) | (641) | (657) | (2,121) | (1,329)
Other Contracts [Member] | Principal Transaction Revenue [Member] | Auction Rate Securities Purchase Commitment [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) | (237) | 691 | (132) | 1,086
Other Contracts [Member] | Other [Member] | Tba Sale Agreements [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) | 7,531 | 4,596 | 5,912 | (3,771)
Other Contracts [Member] | Other [Member] | Interest Rate Lock Commitments [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) | (6,503) | 8,059 | (1,977) | 7,973
Other Contracts [Member] | Foreign Exchange Forward [Member] | Other [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) | 28 |  | 31 |
Other Contracts [Member] | To Be Announced Security [Member] | Principal Transaction Revenue [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) | $ 1 | $ (60) | $ (13) | $ (24)

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- Definition Gain (loss) on derivatives pre tax recognized in income. + References No definition available. + Details
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