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Financial Instruments (Schedule Of Trading Securities Sold, Not Yet Purchased) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]    
Trading securities sold, not yet purchased $ 74,362 $ 44,167
U.S. government agency MBS [Member]
    
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]    
Trading securities sold, not yet purchased 561 [1] 13 [1]
U.S. Treasury securities [Member]
    
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]    
Trading securities sold, not yet purchased 46,958 19,722
Corporate bonds and redeemable preferred stock [Member]
    
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]    
Trading securities sold, not yet purchased 21,184 21,976
Foreign government bonds [Member]
    
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]    
Trading securities sold, not yet purchased 67  
Municipal bonds [Member]
    
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]    
Trading securities sold, not yet purchased 129 128
Exchange Traded Funds [Member]
    
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]    
Trading securities sold, not yet purchased 99  
Certificates of deposit [Member]
    
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]    
Trading securities sold, not yet purchased 5,364 2,325
Equity securities [Member]
    
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]    
Trading securities sold, not yet purchased   $ 3
[1] Represents TBAs. See note 8.