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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 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Segment Reporting Information [Line Items]        
Capital Expenditures $ 19,859 $ 17,958 $ 36,894 $ 25,750
Depreciation 5,331 5,730 10,915 11,434
Amortization 9,584 8,427 18,798 16,669
Private Banks [Member]
        
Segment Reporting Information [Line Items]        
Capital Expenditures 9,510 11,852 18,308 16,703
Depreciation 3,557 3,947 7,289 7,880
Amortization 6,192 5,457 12,143 10,793
Investment Advisors [Member]
        
Segment Reporting Information [Line Items]        
Capital Expenditures 4,061 4,192 7,650 5,967
Depreciation 512 517 1,003 1,026
Amortization 2,286 2,001 4,484 3,958
Institutional Investors [Member]
        
Segment Reporting Information [Line Items]        
Capital Expenditures 1,642 781 2,930 1,144
Depreciation 209 222 419 452
Amortization 355 309 695 611
Investment Managers [Member]
        
Segment Reporting Information [Line Items]        
Capital Expenditures 3,087 852 5,222 1,475
Depreciation 512 474 1,024 936
Amortization 236 206 464 408
Investments In New Businesses [Member]
        
Segment Reporting Information [Line Items]        
Capital Expenditures 616 187 1,196 275
Depreciation 420 454 950 908
Amortization 458 397 898 785
Total From Business Segments [Member]
        
Segment Reporting Information [Line Items]        
Capital Expenditures 18,916 17,864 35,306 25,564
Depreciation 5,210 5,614 10,685 11,202
Amortization 9,527 8,370 18,684 16,555
Corporate Overhead [Member]
        
Segment Reporting Information [Line Items]        
Capital Expenditures 943 94 1,588 186
Depreciation 121 116 230 232
Amortization $ 57 $ 57 $ 114 $ 114