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Financial Instruments (Schedule Of Trading Securities Sold, Not Yet Purchased) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]    
Trading securities sold, not yet purchased $ 49,504 $ 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 121 [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 38,066 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 10,679 21,976
Foreign government bonds [Member]
    
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]    
Trading securities sold, not yet purchased 26  
Municipal bonds [Member]
    
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]    
Trading securities sold, not yet purchased 88 128
Certificates of deposit [Member]
    
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]    
Trading securities sold, not yet purchased 524 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] Includes TBAs. See notes 3-G and 10.