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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
ASSETS |  |  |  |
Cash equivalents | $ 16,242 |  | $ 13,000 |
Deposits with clearing organizations | 26,437 |  | 31,456 |
Securities owned |  |  |  |
Securities owned, at fair value | 707,108 |  | 734,831 |
Securities Owned and Sold, Not yet Purchased, at Fair Value, Security Owned, Including Disposal Group Securities Owned | 710,668 |  | 735,393 |
Investments | 6,848 |  |  |
Loans held for sale |  |  | 60,234 |
Securities purchased under agreements to resell | 24,006 | [1] | 206,499 | [2]
Derivative contracts |  |  |  |
Derivative contracts, total | 1,663 |  | 15,609 |
Total | 779,174 |  | 1,062,348 |
Securities sold, but not yet purchased |  |  |  |
Securities sold but not yet purchased, at fair value | 85,050 |  | 126,493 |
Derivative contracts: |  |  |  |
Derivative contracts | 2,024 |  | 14,162 |
Total | 87,074 |  | 140,655 |
Futures |  |  |  |
Derivative contracts: |  |  |  |
Derivative contracts | 166 |  |  |
Foreign exchange forward contracts |  |  |  |
Derivative contracts: |  |  |  |
Derivative contracts | 1 |  | 2 |
Eurodollar Future [Member] |  |  |  |
Derivative contracts: |  |  |  |
TBAs |  |  | 11,619 |
TBAs |  |  |  |
Derivative contracts |  |  |  |
Derivative contracts, total | 814 |  | 6,448 |
Derivative contracts: |  |  |  |
Derivative contracts |  |  | 249 |
TBAs | 1,212 |  |  |
Interest Rate Lock Commitments [Member] |  |  |  |
Derivative contracts |  |  |  |
Derivative contracts, total |  |  | 9,161 |
Derivative contracts: |  |  |  |
Derivative contracts |  |  | 923 |
ARS purchase commitments |  |  |  |
Derivative contracts |  |  |  |
Derivative contracts, total | 849 |  |  |
Derivative contracts: |  |  |  |
Derivative contracts | 645 |  | 1,369 |
Investments |  |  |  |
Securities owned |  |  |  |
Investments | 158 | [3] | 157 | [4]
Corporate equities |  |  |  |
Securities owned |  |  |  |
Securities owned, at fair value | 31,174 |  | 34,475 |
Securities sold, but not yet purchased |  |  |  |
Securities sold but not yet purchased, at fair value | 41,689 |  | 41,378 |
Money markets |  |  |  |
Securities owned |  |  |  |
Securities owned, at fair value | 189 |  | 35 |
Auction rate securities |  |  |  |
Securities owned |  |  |  |
Securities owned, at fair value | 84,926 |  | 86,802 |
U.S. Treasury securities (1) |  |  |  |
Securities owned |  |  |  |
Securities owned, at fair value | 418,888 |  | 436,533 |
Securities sold, but not yet purchased |  |  |  |
Securities sold but not yet purchased, at fair value | 28,662 |  | 75,653 |
U.S. Agency securities |  |  |  |
Securities owned |  |  |  |
Securities owned, at fair value | 38,269 |  | 71,416 |
Securities sold, but not yet purchased |  |  |  |
Securities sold but not yet purchased, at fair value | 12 |  | 15 |
Sovereign obligations |  |  |  |
Securities owned |  |  |  |
Securities owned, at fair value | 1,894 |  | 1,665 |
Securities sold, but not yet purchased |  |  |  |
Securities sold but not yet purchased, at fair value |  |  | 1,817 |
Corporate debt and other obligations |  |  |  |
Securities owned |  |  |  |
Securities owned, at fair value | 17,074 |  | 16,138 |
Securities sold, but not yet purchased |  |  |  |
Securities sold but not yet purchased, at fair value | 2,536 |  | 1,652 |
Mortgage and other asset-backed securities |  |  |  |
Securities owned |  |  |  |
Securities owned, at fair value | 5,024 |  | 3,504 |
Securities sold, but not yet purchased |  |  |  |
Securities sold but not yet purchased, at fair value | 31 |  | 27 |
Municipal obligations |  |  |  |
Securities owned |  |  |  |
Securities owned, at fair value | 56,750 |  | 30,132 |
Securities sold, but not yet purchased |  |  |  |
Securities sold but not yet purchased, at fair value | 516 |  | 0 |
Convertible bonds |  |  |  |
Securities owned |  |  |  |
Securities owned, at fair value | 56,480 |  | 54,693 |
Securities sold, but not yet purchased |  |  |  |
Securities sold but not yet purchased, at fair value | 11,604 |  | 5,951 |
Level 1 |  |  |  |
ASSETS |  |  |  |
Cash equivalents | 16,242 |  | 13,000 |
Deposits with clearing organizations | 26,437 |  | 31,456 |
Securities owned |  |  |  |
Securities owned, at fair value | 456,129 |  | 496,283 |
Derivative contracts |  |  |  |
Total | 498,808 |  | 540,739 |
Securities sold, but not yet purchased |  |  |  |
Securities sold but not yet purchased, at fair value | 70,351 |  | 117,031 |
Derivative contracts: |  |  |  |
Derivative contracts | 167 |  | 251 |
Total | 70,518 |  | 117,282 |
Level 1 | Futures |  |  |  |
Derivative contracts: |  |  |  |
Derivative contracts | 166 |  |  |
Level 1 | Foreign exchange forward contracts |  |  |  |
Derivative contracts: |  |  |  |
Derivative contracts | 1 |  | 2 |
Level 1 | TBAs |  |  |  |
Derivative contracts: |  |  |  |
Derivative contracts |  |  | 249 |
Level 1 | Corporate equities |  |  |  |
Securities owned |  |  |  |
Securities owned, at fair value | 31,174 |  | 34,475 |
Securities sold, but not yet purchased |  |  |  |
Securities sold but not yet purchased, at fair value | 41,689 |  | 41,378 |
Level 1 | Money markets |  |  |  |
Securities owned |  |  |  |
Securities owned, at fair value | 189 |  | 35 |
Level 1 | U.S. Treasury securities (1) |  |  |  |
Securities owned |  |  |  |
Securities owned, at fair value | 418,888 |  | 436,533 |
Securities sold, but not yet purchased |  |  |  |
Securities sold but not yet purchased, at fair value | 28,662 |  | 75,653 |
Level 1 | U.S. Agency securities |  |  |  |
Securities owned |  |  |  |
Securities owned, at fair value | 5,878 |  | 25,240 |
Level 2 |  |  |  |
ASSETS |  |  |  |
Cash equivalents | 0 |  |  |
Deposits with clearing organizations | 0 |  |  |
Securities owned |  |  |  |
Securities owned, at fair value | 169,569 |  | 152,227 |
Loans held for sale |  |  | 60,234 |
Securities purchased under agreements to resell | 24,006 | [1] | 206,499 | [2]
Derivative contracts |  |  |  |
Derivative contracts, total | 814 |  | 6,448 |
Total | 194,389 |  | 425,408 |
Securities sold, but not yet purchased |  |  |  |
Securities sold but not yet purchased, at fair value | 14,699 |  | 9,462 |
Derivative contracts: |  |  |  |
Derivative contracts | 1,212 |  | 11,619 |
Total | 15,911 |  | 21,081 |
Level 2 | Eurodollar Future [Member] |  |  |  |
Derivative contracts: |  |  |  |
TBAs |  |  | 11,619 |
Level 2 | TBAs |  |  |  |
Derivative contracts |  |  |  |
Derivative contracts, total | 814 |  | 6,448 |
Derivative contracts: |  |  |  |
TBAs | 1,212 |  |  |
Level 2 | U.S. Agency securities |  |  |  |
Securities owned |  |  |  |
Securities owned, at fair value | 32,391 |  | 46,176 |
Securities sold, but not yet purchased |  |  |  |
Securities sold but not yet purchased, at fair value | 12 |  | 15 |
Level 2 | Sovereign obligations |  |  |  |
Securities owned |  |  |  |
Securities owned, at fair value | 1,894 |  | 1,665 |
Securities sold, but not yet purchased |  |  |  |
Securities sold but not yet purchased, at fair value |  |  | 1,817 |
Level 2 | Corporate debt and other obligations |  |  |  |
Securities owned |  |  |  |
Securities owned, at fair value | 17,074 |  | 16,138 |
Securities sold, but not yet purchased |  |  |  |
Securities sold but not yet purchased, at fair value | 2,536 |  | 1,652 |
Level 2 | Mortgage and other asset-backed securities |  |  |  |
Securities owned |  |  |  |
Securities owned, at fair value | 5,024 |  | 3,504 |
Securities sold, but not yet purchased |  |  |  |
Securities sold but not yet purchased, at fair value | 31 |  | 27 |
Level 2 | Municipal obligations |  |  |  |
Securities owned |  |  |  |
Securities owned, at fair value | 56,706 |  | 30,051 |
Securities sold, but not yet purchased |  |  |  |
Securities sold but not yet purchased, at fair value | 516 |  |  |
Level 2 | Convertible bonds |  |  |  |
Securities owned |  |  |  |
Securities owned, at fair value | 56,480 |  | 54,693 |
Securities sold, but not yet purchased |  |  |  |
Securities sold but not yet purchased, at fair value | 11,604 |  | 5,951 |
Level 3 |  |  |  |
ASSETS |  |  |  |
Cash equivalents | 0 |  |  |
Securities owned |  |  |  |
Securities owned, at fair value | 84,970 |  | 86,883 |
Derivative contracts |  |  |  |
Derivative contracts, total | 849 |  | 9,161 |
Total | 85,977 |  | 96,201 |
Derivative contracts: |  |  |  |
Derivative contracts | 645 |  | 2,292 |
Total | 645 |  | 2,292 |
Level 3 | Interest Rate Lock Commitments [Member] |  |  |  |
Derivative contracts |  |  |  |
Derivative contracts, total |  |  | 9,161 |
Derivative contracts: |  |  |  |
Derivative contracts |  |  | 923 |
Level 3 | ARS purchase commitments |  |  |  |
Derivative contracts |  |  |  |
Derivative contracts, total | 849 |  |  |
Derivative contracts: |  |  |  |
Derivative contracts | 645 |  | 1,369 |
Level 3 | Investments |  |  |  |
Securities owned |  |  |  |
Investments | 158 | [3] | 157 | [4]
Level 3 | Auction rate securities |  |  |  |
Securities owned |  |  |  |
Securities owned, at fair value | 84,926 |  | 86,802 |
Level 3 | Municipal obligations |  |  |  |
Securities owned |  |  |  |
Securities owned, at fair value | $ 44 |  | $ 81 |
[1] | .
[2] | n
[3] | .
[4] | n

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