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Fair Value Disclosures (Schedule Of Assets And Liabilities Measured With Level 3 Inputs) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2013
Trading Securities [Member]
Jun. 30, 2012
Trading Securities [Member]
Jun. 30, 2013
Trading Securities [Member]
Jun. 30, 2012
Trading Securities [Member]
Jun. 30, 2013
Trading Securities [Member]
Trading Revenue [Member]
Jun. 30, 2012
Trading Securities [Member]
Trading Revenue [Member]
Jun. 30, 2013
Trading Securities [Member]
Trading Revenue [Member]
Jun. 30, 2012
Trading Securities [Member]
Trading Revenue [Member]
Jun. 30, 2013
Alternative Investments [Member]
Jun. 30, 2012
Alternative Investments [Member]
Jun. 30, 2013
Alternative Investments [Member]
Jun. 30, 2012
Alternative Investments [Member]
Jun. 30, 2013
Alternative Investments [Member]
Principal Investing [Member]
Jun. 30, 2012
Alternative Investments [Member]
Principal Investing [Member]
Jun. 30, 2013
Alternative Investments [Member]
Principal Investing [Member]
Jun. 30, 2012
Alternative Investments [Member]
Principal Investing [Member]
Jun. 30, 2013
Equity Method Investments [Member]
Jun. 30, 2012
Equity Method Investments [Member]
Jun. 30, 2013
Equity Method Investments [Member]
Jun. 30, 2012
Equity Method Investments [Member]
Jun. 30, 2013
Equity Method Investments [Member]
Principal Investing [Member]
Jun. 30, 2012
Equity Method Investments [Member]
Principal Investing [Member]
Jun. 30, 2013
Equity Method Investments [Member]
Principal Investing [Member]
Jun. 30, 2012
Equity Method Investments [Member]
Principal Investing [Member]
Jun. 30, 2013
EuroDekania Management Limited [Member]
Equity Method Investments [Member]
Jun. 30, 2012
EuroDekania Management Limited [Member]
Equity Method Investments [Member]
Jun. 30, 2013
EuroDekania Management Limited [Member]
Equity Method Investments [Member]
Jun. 30, 2012
EuroDekania Management Limited [Member]
Equity Method Investments [Member]
Jun. 30, 2013
EuroDekania Management Limited [Member]
Equity Method Investments [Member]
Principal Investing [Member]
Jun. 30, 2012
EuroDekania Management Limited [Member]
Equity Method Investments [Member]
Principal Investing [Member]
Jun. 30, 2013
EuroDekania Management Limited [Member]
Equity Method Investments [Member]
Principal Investing [Member]
Jun. 30, 2012
EuroDekania Management Limited [Member]
Equity Method Investments [Member]
Principal Investing [Member]
Jun. 30, 2013
Star Asia [Member]
Equity Method Investments [Member]
Jun. 30, 2012
Star Asia [Member]
Equity Method Investments [Member]
Jun. 30, 2013
Star Asia [Member]
Equity Method Investments [Member]
Jun. 30, 2012
Star Asia [Member]
Equity Method Investments [Member]
Jun. 30, 2013
Star Asia [Member]
Equity Method Investments [Member]
Principal Investing [Member]
Jun. 30, 2012
Star Asia [Member]
Equity Method Investments [Member]
Principal Investing [Member]
Jun. 30, 2013
Star Asia [Member]
Equity Method Investments [Member]
Principal Investing [Member]
Jun. 30, 2012
Star Asia [Member]
Equity Method Investments [Member]
Principal Investing [Member]
Jun. 30, 2013
Tiptree Financial Partners L.P. [Member]
Equity Method Investments [Member]
Jun. 30, 2012
Tiptree Financial Partners L.P. [Member]
Equity Method Investments [Member]
Jun. 30, 2013
Tiptree Financial Partners L.P. [Member]
Equity Method Investments [Member]
Jun. 30, 2012
Tiptree Financial Partners L.P. [Member]
Equity Method Investments [Member]
Jun. 30, 2012
Tiptree Financial Partners L.P. [Member]
Equity Method Investments [Member]
Principal Investing [Member]
Jun. 30, 2012
Tiptree Financial Partners L.P. [Member]
Equity Method Investments [Member]
Principal Investing [Member]
Jun. 30, 2013
Star Asia Special Situations Fund [Member]
Equity Method Investments [Member]
Jun. 30, 2013
Star Asia Special Situations Fund [Member]
Equity Method Investments [Member]
Jun. 30, 2013
Star Asia Special Situations Fund [Member]
Equity Method Investments [Member]
Principal Investing [Member]
Jun. 30, 2013
Star Asia Special Situations Fund [Member]
Equity Method Investments [Member]
Principal Investing [Member]
Jun. 30, 2012
Other Equity Securities [Member]
Equity Method Investments [Member]
Jun. 30, 2012
Other Equity Securities [Member]
Equity Method Investments [Member]
Jun. 30, 2012
Other Equity Securities [Member]
Equity Method Investments [Member]
Principal Investing [Member]
Jun. 30, 2012
Other Equity Securities [Member]
Equity Method Investments [Member]
Principal Investing [Member]
Jun. 30, 2012
Residential Mortgage [Member]
Alternative Investments [Member]
Jun. 30, 2012
RMBS [Member]
Trading Securities [Member]
Jun. 30, 2012
RMBS [Member]
Trading Securities [Member]
Trading Revenue [Member]
Jun. 30, 2013
Interests in securitizations [Member]
Trading Securities [Member]
Jun. 30, 2012
Interests in securitizations [Member]
Trading Securities [Member]
Jun. 30, 2013
Interests in securitizations [Member]
Trading Securities [Member]
Jun. 30, 2012
Interests in securitizations [Member]
Trading Securities [Member]
Jun. 30, 2013
Interests in securitizations [Member]
Trading Securities [Member]
Trading Revenue [Member]
Jun. 30, 2012
Interests in securitizations [Member]
Trading Securities [Member]
Trading Revenue [Member]
Jun. 30, 2013
Interests in securitizations [Member]
Trading Securities [Member]
Trading Revenue [Member]
Jun. 30, 2012
Interests in securitizations [Member]
Trading Securities [Member]
Trading Revenue [Member]
Jun. 30, 2013
Interests in securitizations [Member]
Alternative Investments [Member]
Jun. 30, 2013
Interests in securitizations [Member]
Alternative Investments [Member]
Jun. 30, 2012
Interests in securitizations [Member]
Alternative Investments [Member]
Mar. 31, 2012
Interests in securitizations [Member]
Alternative Investments [Member]
Jun. 30, 2013
Interests in securitizations [Member]
Alternative Investments [Member]
Principal Investing [Member]
Jun. 30, 2013
Interests in securitizations [Member]
Alternative Investments [Member]
Principal Investing [Member]
Jun. 30, 2012
Interests in securitizations [Member]
Alternative Investments [Member]
Principal Investing [Member]
Jun. 30, 2012
Equity securities [Member]
Trading Securities [Member]
Jun. 30, 2012
Equity securities [Member]
Trading Securities [Member]
Jun. 30, 2012
Equity securities [Member]
Trading Securities [Member]
Trading Revenue [Member]
Jun. 30, 2012
Equity securities [Member]
Trading Securities [Member]
Trading Revenue [Member]
Schedule of additional information about assets and liabilities measured at fair value on a recurring basis level 3 inputs                                                                                                                                                        
Level 3 inputs, Beginning balance $ 259 $ 2,576 $ 295 $ 5,188         $ 32,294 $ 37,295 $ 37,637 $ 42,748         $ 32,212 $ 37,198 $ 37,560 $ 42,393         $ 2,394 [1] $ 2,348 [1] $ 2,054 [1] $ 2,370 [1]         $ 24,136 [2] $ 32,118 [2] $ 30,169 [2] $ 37,358 [2]         $ 2,834 [3] $ 2,650 [3] $ 2,834 [3] $ 2,533 [3]     $ 2,848 $ 2,503 [2]     $ 82 $ 132     $ 267 $ 4,932   $ 259 [4] $ 2,409 [4] $ 295 [4] $ 221 [4]         $ 82 [4] $ 77 [4] $ 88 [4] $ 97 [4]       $ 167 $ 35    
Transactions included in income         72 (125) 36 (139)         (3,652) (5) (9,297) (5,191)         (3,628) (5) (9,278) (5,200)         (354) [1] (245) [1] (14) [1] (267) [1]         (3,201) [2] 181 [2] (9,234) [2] (5,059) [2]         53 [3] 170 [3]     (73) (30) [2]     6 (44)     17         72 [4] (21) [4] 36 [4] (58) [4]         (24) [4] (19) [4] 9 [4]     (104) (98)
Transfers into Level 3 0 0 0 0           0                                                                                                                                    
Transfers out of Level 3 0 0 0 0         (2,834) 0 (2,834) (267)         (2,834)   (2,834)                                           (2,834) [3]   (2,834) [3]                       (267)                                          
Purchases       2,522             302               302                                                         302 [2]               171         2,225 [4]                         126    
Sales (110) (2,203) (110) (7,323)                                                                                                       (5,120)   (110) [4] (2,203) [4] (110) [4] (2,203) [4]                              
Level 3 inputs, Ending balance 221 248 221 248         25,808 37,290 25,808 37,290         25,750 37,193 25,750 37,193         2,040 [1] 2,103 [1] 2,040 [1] 2,103 [1]         20,935 [2] 32,299 [2] 20,935 [2] 32,299 [2]           2,703 [3]   2,703 [3]     2,775 [2] 2,775 [2]     88 88           221 [4] 185 [4] 221 [4] 185 [4]         58 [4] 58 [4] 97 [4] 97 [4]       63 63    
Change in unrealized gains /(losses) for the period included in earnings $ (38) [5] $ (104) [5] $ (74) [5] $ (135) [5]         $ (3,652) [5] $ (5) [5] $ (9,297) [5] $ (5,191) [5]         $ (3,628) [5] $ (5) [5] $ (9,278) [5] $ (5,200) [5]         $ (354) [1],[5] $ (245) [1],[5] $ (14) [1],[5] $ (267) [1],[5]         $ (3,201) [2],[5] $ 181 [2],[5] $ (9,234) [2],[5] $ (5,059) [2],[5]           $ 53 [3],[5]   $ 170 [3],[5]     $ (73) [5] $ (30) [2],[5]     $ 6 [5] $ (44) [5]           $ (38) [4],[5]   $ (74) [4],[5] $ (37) [4],[5]         $ (24) [4],[5] $ (19) [4],[5] $ 9 [4],[5]         $ (104) [5] $ (98) [5]    
[1] Hybrid Securities Fund—European.
[2] Real Estate Fund—Asian.
[3] Diversified Fund.
[4] Primarily comprised of CDOs, CLOs, and ABS.
[5] Represents the change in unrealized gains and losses for the period included in earnings for assets held at the end of the reporting period.