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Business Segment Information (Schedule Of Financial Information About Business Segments) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Segment Reporting Information [Line Items]                      
Revenues $ 299,024 $ 280,655 $ 274,574 $ 271,879 $ 261,635 $ 251,752 $ 241,237 $ 237,898 $ 1,126,132 $ 992,522 $ 929,727
Expenses                 824,279 736,172 683,884
Operating profit (loss)                 301,853 256,350 245,843
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal                 22,112    
Total Profit (Loss)                 323,965    
Private Banks [Member]
                      
Segment Reporting Information [Line Items]                      
Revenues                 397,138 364,788 348,122
Expenses                 392,399 357,001 339,339
Operating profit (loss)                 4,739 7,787 8,783
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal                 22,112    
Total Profit (Loss)                 26,851    
Investment Advisors [Member]
                      
Segment Reporting Information [Line Items]                      
Revenues                 241,252 202,703 189,780
Expenses                 133,962 120,146 110,438
Operating profit (loss)                 107,290 82,557 79,342
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal                 0    
Total Profit (Loss)                 107,290    
Institutional Investors [Member]
                      
Segment Reporting Information [Line Items]                      
Revenues                 257,658 227,889 210,027
Expenses                 133,218 116,546 106,585
Operating profit (loss)                 124,440 111,343 103,442
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal                 0    
Total Profit (Loss)                 124,440    
Investment Managers [Member]
                      
Segment Reporting Information [Line Items]                      
Revenues                 226,081 193,484 177,975
Expenses                 148,977 127,525 115,963
Operating profit (loss)                 77,104 65,959 62,012
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal                 0    
Total Profit (Loss)                 77,104    
Investments In New Businesses [Member]
                      
Segment Reporting Information [Line Items]                      
Revenues                 4,003 3,658 3,823
Expenses                 15,723 14,954 11,559
Operating profit (loss)                 (11,720) (11,296) (7,736)
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal                 0    
Total Profit (Loss)                 $ (11,720)