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Business Segment Information (Schedule Of Additional Information Pertaining To Business Segments) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Segment Reporting Information [Line Items]        
Capital Expenditures $ 15,707 $ 12,987 $ 41,457 $ 47,545
Depreciation 5,616 5,761 17,050 16,823
Amortization 8,829 10,384 25,498 25,413
Private Banks [Member]
        
Segment Reporting Information [Line Items]        
Capital Expenditures 9,376 8,248 26,079 28,270
Depreciation 3,799 3,911 11,679 11,343
Amortization 5,704 7,660 16,497 17,139
Investment Advisors [Member]
        
Segment Reporting Information [Line Items]        
Capital Expenditures 3,513 2,797 9,480 9,743
Depreciation 521 503 1,547 1,489
Amortization 2,105 1,832 6,063 5,305
Institutional Investors [Member]
        
Segment Reporting Information [Line Items]        
Capital Expenditures 777 647 1,921 2,514
Depreciation 222 252 674 765
Amortization 326 302 937 906
Investment Managers [Member]
        
Segment Reporting Information [Line Items]        
Capital Expenditures 1,596 927 3,071 5,090
Depreciation 525 500 1,461 1,468
Amortization 218 201 626 603
Investments In New Businesses [Member]
        
Segment Reporting Information [Line Items]        
Capital Expenditures 186 140 461 560
Depreciation 442 449 1,350 1,273
Amortization 419 332 1,204 905
Total From Business Segments [Member]
        
Segment Reporting Information [Line Items]        
Capital Expenditures 15,448 12,759 41,012 46,177
Depreciation 5,509 5,615 16,711 16,338
Amortization 8,772 10,327 25,327 24,858
Corporate Overhead [Member]
        
Segment Reporting Information [Line Items]        
Capital Expenditures 259 228 445 1,368
Depreciation 107 146 339 485
Amortization $ 57 $ 57 $ 171 $ 555