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Business Segment Information (Schedule Of Financial Information About Business Segments) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Segment Reporting Information [Line Items]    
Revenues $ 302,386 $ 271,879
Expenses 212,295 198,332
Operating profit (loss) 90,091 73,547
Gain on sale of subsidiary 5,582 22,112
Total profit (loss) 95,673 95,659
Private Banks [Member]
    
Segment Reporting Information [Line Items]    
Revenues 105,179 98,746
Expenses 100,190 96,298
Operating profit (loss) 4,989 2,448
Gain on sale of subsidiary 5,582 22,112
Total profit (loss) 10,571 24,560
Investment Advisors [Member]
    
Segment Reporting Information [Line Items]    
Revenues 66,424 55,191
Expenses 34,577 31,625
Operating profit (loss) 31,847 23,566
Gain on sale of subsidiary 0 0
Total profit (loss) 31,847 23,566
Institutional Investors [Member]
    
Segment Reporting Information [Line Items]    
Revenues 68,657 63,162
Expenses 34,095 31,509
Operating profit (loss) 34,562 31,653
Gain on sale of subsidiary 0 0
Total profit (loss) 34,562 31,653
Investment Managers [Member]
    
Segment Reporting Information [Line Items]    
Revenues 61,008 53,820
Expenses 39,184 35,162
Operating profit (loss) 21,824 18,658
Gain on sale of subsidiary 0 0
Total profit (loss) 21,824 18,658
Investments In New Businesses [Member]
    
Segment Reporting Information [Line Items]    
Revenues 1,118 960
Expenses 4,249 3,738
Operating profit (loss) (3,131) (2,778)
Gain on sale of subsidiary 0 0
Total profit (loss) $ (3,131) $ (2,778)