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Related Party Transactions (Schedule Of Related Party Transactions) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Related Party Transaction [Line Items] |  |  |  |  |  |
Net trading | $ 38,528 |  | $ 69,486 |  | $ 73,167 |
Income / (loss) from equity method affiliates | 1,828 |  | 5,052 |  | 6,232 |
Cohen Brothers Financial, L.L.C. [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Management fee revenue |  |  | 64 |  | 273 |
TBBK [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Net trading | 483 |  | 156 |  | 658 |
Star Asia [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Management fee revenue | 2,329 |  |  |  |  |
Principal transactions and other income, Dividend income and other |  |  |  |  | 38 |
Principal transactions and other income, Gain/(Loss) | (13,065) |  | (7,274) |  | (542) |
Star Asia Manager [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Income / (loss) from equity method affiliates | 158 | [1] | 1,101 | [1] | 1,694 | [1]
Star Asia SPV [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Income / (loss) from equity method affiliates | 1,287 |  | 1,581 |  | 702 |
Star Asia Opportunity [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Income / (loss) from equity method affiliates | (5) |  | 544 |  | 405 |
Star Asia Opportunity II [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Income / (loss) from equity method affiliates |  |  | (382) |  |  |
Star Asia Capital Management [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Income / (loss) from equity method affiliates | 145 |  | 504 |  | 44 |
Star Asia Special Situations Fund [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Principal transactions and other income, Gain/(Loss) | 152 |  | 662 |  |  |
S.A.A. Manager [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Income / (loss) from equity method affiliates | 255 |  | (8) |  |  |
EuroDekania [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Management fee revenue |  |  | 139 |  | 667 |
Net trading |  |  |  |  | (101) |
Principal transactions and other income, Dividend income and other | 805 |  | 970 |  | 298 |
Principal transactions and other income, Gain/(Loss) | 1,167 |  | (331) |  | 579 |
MFCA [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Principal transactions and other income, Dividend income and other |  |  |  |  | 32 |
Principal transactions and other income, Gain/(Loss) |  |  |  |  | 71 |
Deep Value [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Management fee revenue |  |  |  |  | 452 |
Principal transactions and other income, Gain/(Loss) |  |  |  |  | (9) |
Income / (loss) from equity method affiliates | (13) |  | 1,712 |  | 4,351 |
E.B.C. [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Interest expense incurred | 59 |  |  |  |  |
Mead Park Capital [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Interest expense incurred | 144 |  |  |  |  |
Duart Fund [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Principal transactions and other income, Gain/(Loss) |  |  |  |  | (456) |
Duart Capital and Other [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Income / (loss) from equity method affiliates |  |  |  |  | (964) |
Other Related Parties [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Income / (loss) from equity method affiliates | 1 |  |  |  |  |
Affiliated Entity [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Management fee revenue | 2,329 |  | 203 |  | 1,392 |
Net trading | 483 |  | 156 |  | 557 |
Principal transactions and other income, Dividend income and other | 805 |  | 970 |  | 368 |
Principal transactions and other income, Gain/(Loss) | (11,746) |  | (6,943) |  | (357) |
Income / (loss) from equity method affiliates | 1,828 |  | 5,052 |  | 6,232 |
Interest expense incurred | $ 203 |  |  |  |  |
[1] | Beginning March 1, 2013, Star Asia Manager was consolidated by the Company. Prior to that, it was treated as an equity method investment. See note A above.

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