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Related Party Transactions (Schedule Of Related Party Transactions) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Related Party Transaction [Line Items] |  |  |
Net trading | $ 31,026 | $ 28,056 | $ 38,528
Income / (loss) from equity method affiliates |  | 27 | 1,828
Professional fees and other operating | 8,504 | 9,062 | 13,410
TBBK [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Net trading |  | 24 | 483
Star Asia [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Management fee revenue |  | 125 | 2,329
Principal transactions and other income, Gain/(Loss) |  |  | (13,065)
Star Asia Manager [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Income / (loss) from equity method affiliates |  |  | 158
Star Asia SPV [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Income / (loss) from equity method affiliates |  |  | 1,287
Star Asia Opportunity [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Income / (loss) from equity method affiliates |  |  | (5)
Star Asia Capital Management [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Income / (loss) from equity method affiliates |  | 13 | 145
Star Asia Special Situations Fund [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Principal transactions and other income, Gain/(Loss) |  |  | 152
S.A.A. Manager [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Income / (loss) from equity method affiliates |  | 14 | 255
EuroDekania [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Principal transactions and other income, Gain/(Loss) |  |  | 1,971
Deep Value [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Income / (loss) from equity method affiliates |  |  | (13)
E.B.C. [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Interest expense incurred | 228 | 224 | 59
Edward E. Cohen IRA [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Interest expense incurred | 210 |  |
Mead Park Capital [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Interest expense incurred | 340 | 547 | 144
Mead Park Advisors LLC [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Professional fees and other operating | 200 |  |
Resource America [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Net trading | 3 |  |
Woodlea [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Professional fees and other operating | 39 |  |
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 |  | 125 | 2,329
Net trading | 3 | 24 | 483
Principal transactions and other income, Gain/(Loss) |  |  | (10,942)
Income / (loss) from equity method affiliates |  | 27 | 1,828
Professional fees and other operating | 239 |  |
Interest expense incurred | $ 778 | $ 771 | $ 203

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