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Fair Value Disclosures (Schedule Of Assets And Liabilities Measured With Level 3 Inputs) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Schedule of additional information about assets and liabilities measured at fair value on a recurring basis level 3 inputs        
Level 3 inputs, Beginning balance $ 14,651 $ 4,855 $ 6,577 $ 6,761
Transfers into Level 3
Transfers out of Level 3 (11,295) (13,361)
Accretion of income [1] 489 169 1,330 938
Purchases 9,600
Sales and returns of capital (1,103) (306) (1,481) (2,996)
Level 3 inputs, Ending balance 3,161 4,615 3,161 4,615
Change in unrealized gains /(losses) [2] (171) 187 (220) 608
Net Trading [Member]        
Schedule of additional information about assets and liabilities measured at fair value on a recurring basis level 3 inputs        
Transactions included in income - Gains and Losses
Gains and Losses [Member]        
Schedule of additional information about assets and liabilities measured at fair value on a recurring basis level 3 inputs        
Transactions included in income - Gains and Losses [1] 419 $ (103) 496 $ (88)
Alternative Investments [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     4,511  
Level 3 inputs, Ending balance $ 16,064   $ 16,064  
[1] Gains and losses and accretion of income on investments-trading are recorded as a component of net trading in the consolidated statements of operations. Gains and losses and accretion of income on other investments, at fair value are recorded as a component of principal transactions and other income in the consolidated statements of operations.
[2] Represents the change in unrealized gains and losses for the period included in current year earnings for assets held at the end of the reporting period.