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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
ASSETS |  |  |  |
Cash equivalents | $ 13,000 |  | $ 31,175 |
Deposits With Clearing Organizations Fair Value | 31,456 |  | 24,188 |
Securities owned: |  |  |  |
Securities owned | 735,393 |  | 843,155 |
Investments | 7,627 |  |  |
Loans held for sale | 60,234 |  | 19,243 |
Securities purchased under agreements to resell | 206,499 | [1] | 250,000 | [2]
Derivative contracts: |  |  |  |
Derivative contracts, total | 15,609 |  | 12,111 |
Total | 1,070,454 |  | 1,189,380 |
Liabilities |  |  |  |
Securities sold, but not yet purchased, at fair value | 126,493 |  | 92,510 |
Derivative contracts: |  |  |  |
Derivative contracts | 14,162 |  | 3,505 |
Total | 140,655 |  | 96,015 |
Futures |  |  |  |
Derivative contracts: |  |  |  |
Derivative contracts | 249 |  | 353 |
Foreign currency forward contracts |  |  |  |
Derivative contracts: |  |  |  |
Derivative contracts | 2 |  | 10 |
TBAs |  |  |  |
Derivative contracts: |  |  |  |
Derivative contracts, total | 6,448 |  | 4,535 |
Derivative contracts: |  |  |  |
Derivative contracts | 11,619 |  | 1,018 |
Interest rate lock commitments |  |  |  |
Derivative contracts: |  |  |  |
Derivative contracts, total | 9,161 |  | 7,576 |
Derivative contracts: |  |  |  |
Derivative contracts | 923 |  | 1,222 |
ARS purchase commitments |  |  |  |
Derivative contracts: |  |  |  |
Derivative contracts | 1,369 |  | 902 |
Investments |  |  |  |
Securities owned: |  |  |  |
Investments | 8,263 | [3] | 9,508 | [4]
Equity securities |  |  |  |
Securities owned: |  |  |  |
Securities owned | 34,475 |  | 42,751 |
Liabilities |  |  |  |
Securities sold, but not yet purchased, at fair value | 41,378 |  | 47,574 |
Money markets |  |  |  |
Securities owned: |  |  |  |
Securities owned | 35 |  | 1,245 |
Auction rate securities |  |  |  |
Securities owned: |  |  |  |
Securities owned | 86,802 |  | 91,422 |
U.S. Treasury securities |  |  |  |
Securities owned: |  |  |  |
Securities owned | 436,533 |  | 540,223 |
Liabilities |  |  |  |
Securities sold, but not yet purchased, at fair value | 75,653 |  | 30,581 |
Agency Securities [Member] |  |  |  |
Securities owned: |  |  |  |
Securities owned | 71,416 |  | 26,261 |
Liabilities |  |  |  |
Securities sold, but not yet purchased, at fair value | 15 |  | 34 |
Sovereign obligations |  |  |  |
Securities owned: |  |  |  |
Securities owned | 1,665 |  | 4,123 |
Liabilities |  |  |  |
Securities sold, but not yet purchased, at fair value | 1,817 |  |  |
Corporate debt and other obligations |  |  |  |
Securities owned: |  |  |  |
Securities owned | 16,138 |  | 19,795 |
Liabilities |  |  |  |
Securities sold, but not yet purchased, at fair value | 1,652 |  | 2,646 |
Mortgage and other asset-backed securities |  |  |  |
Securities owned: |  |  |  |
Securities owned | 3,504 |  | 6,689 |
Liabilities |  |  |  |
Securities sold, but not yet purchased, at fair value | 27 |  | 255 |
Municipal obligations |  |  |  |
Securities owned: |  |  |  |
Securities owned | 30,132 |  | 60,833 |
Liabilities |  |  |  |
Securities sold, but not yet purchased, at fair value | 0 |  | 51 |
Convertible bonds |  |  |  |
Securities owned: |  |  |  |
Securities owned | 54,693 |  | 49,813 |
Liabilities |  |  |  |
Securities sold, but not yet purchased, at fair value | 5,951 |  | 11,369 |
Level 1 |  |  |  |
ASSETS |  |  |  |
Cash equivalents | 13,000 |  | 31,175 |
Deposits With Clearing Organizations Fair Value | 31,456 |  | 24,188 |
Securities owned: |  |  |  |
Securities owned | 496,283 |  | 584,219 |
Derivative contracts: |  |  |  |
Total | 540,739 |  | 639,582 |
Liabilities |  |  |  |
Securities sold, but not yet purchased, at fair value | 117,031 |  | 78,155 |
Derivative contracts: |  |  |  |
Derivative contracts | 251 |  | 363 |
Total | 117,282 |  | 78,518 |
Level 1 | Futures |  |  |  |
Derivative contracts: |  |  |  |
Derivative contracts | 249 |  | 353 |
Level 1 | Foreign currency forward contracts |  |  |  |
Derivative contracts: |  |  |  |
Derivative contracts | 2 |  | 10 |
Level 1 | Equity securities |  |  |  |
Securities owned: |  |  |  |
Securities owned | 34,475 |  | 42,751 |
Liabilities |  |  |  |
Securities sold, but not yet purchased, at fair value | 41,378 |  | 47,574 |
Level 1 | Money markets |  |  |  |
Securities owned: |  |  |  |
Securities owned | 35 |  | 1,245 |
Level 1 | U.S. Treasury securities |  |  |  |
Securities owned: |  |  |  |
Securities owned | 436,533 |  | 540,223 |
Liabilities |  |  |  |
Securities sold, but not yet purchased, at fair value | 75,653 |  | 30,581 |
Level 1 | Agency Securities [Member] |  |  |  |
Securities owned: |  |  |  |
Securities owned | 25,240 |  |  |
Level 2 |  |  |  |
Securities owned: |  |  |  |
Securities owned | 152,227 |  | 167,350 |
Loans held for sale | 60,234 |  | 19,243 |
Securities purchased under agreements to resell | 206,499 | [1] | 250,000 | [2]
Derivative contracts: |  |  |  |
Derivative contracts, total | 6,448 |  | 4,535 |
Total | 425,408 |  | 441,128 |
Liabilities |  |  |  |
Securities sold, but not yet purchased, at fair value | 9,462 |  | 14,355 |
Derivative contracts: |  |  |  |
Derivative contracts | 11,619 |  | 1,018 |
Total | 21,081 |  | 15,373 |
Level 2 | TBAs |  |  |  |
Derivative contracts: |  |  |  |
Derivative contracts, total | 6,448 |  | 4,535 |
Derivative contracts: |  |  |  |
Derivative contracts | 11,619 |  | 1,018 |
Level 2 | Agency Securities [Member] |  |  |  |
Securities owned: |  |  |  |
Securities owned | 46,176 |  | 26,261 |
Liabilities |  |  |  |
Securities sold, but not yet purchased, at fair value | 15 |  | 34 |
Level 2 | Sovereign obligations |  |  |  |
Securities owned: |  |  |  |
Securities owned | 1,665 |  | 4,123 |
Liabilities |  |  |  |
Securities sold, but not yet purchased, at fair value | 1,817 |  |  |
Level 2 | Corporate debt and other obligations |  |  |  |
Securities owned: |  |  |  |
Securities owned | 16,138 |  | 19,795 |
Liabilities |  |  |  |
Securities sold, but not yet purchased, at fair value | 1,652 |  | 2,646 |
Level 2 | Mortgage and other asset-backed securities |  |  |  |
Securities owned: |  |  |  |
Securities owned | 3,504 |  | 6,689 |
Liabilities |  |  |  |
Securities sold, but not yet purchased, at fair value | 27 |  | 255 |
Level 2 | Municipal obligations |  |  |  |
Securities owned: |  |  |  |
Securities owned | 30,051 |  | 60,669 |
Liabilities |  |  |  |
Securities sold, but not yet purchased, at fair value |  |  | 51 |
Level 2 | Convertible bonds |  |  |  |
Securities owned: |  |  |  |
Securities owned | 54,693 |  | 49,813 |
Liabilities |  |  |  |
Securities sold, but not yet purchased, at fair value | 5,951 |  | 11,369 |
Level 3 |  |  |  |
Securities owned: |  |  |  |
Securities owned | 86,883 |  | 91,586 |
Derivative contracts: |  |  |  |
Derivative contracts, total | 9,161 |  | 7,576 |
Total | 104,307 |  | 108,670 |
Derivative contracts: |  |  |  |
Derivative contracts | 2,292 |  | 2,124 |
Total | 2,292 |  | 2,124 |
Level 3 | Interest rate lock commitments |  |  |  |
Derivative contracts: |  |  |  |
Derivative contracts, total | 9,161 |  | 7,576 |
Derivative contracts: |  |  |  |
Derivative contracts | 923 |  | 1,222 |
Level 3 | ARS purchase commitments |  |  |  |
Derivative contracts: |  |  |  |
Derivative contracts | 1,369 |  | 902 |
Level 3 | Investments |  |  |  |
Securities owned: |  |  |  |
Investments | 8,263 | [3] | 9,508 | [4]
Level 3 | Auction rate securities |  |  |  |
Securities owned: |  |  |  |
Securities owned | 86,802 |  | 91,422 |
Level 3 | Municipal obligations |  |  |  |
Securities owned: |  |  |  |
Securities owned | $ 81 |  | $ 164 |
[1] | Included in securities purchased under agreements to resell where the Company has elected fair value option treatment.
[2] | Included in securities purchased under agreements to resell where the Company has elected fair value option treatment.
[3] | Included in other assets on the consolidated balance sheet.
[4] | Included in other assets on the consolidated balance sheet.

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