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Business Segment Information (Schedule Of Additional Information Pertaining To Business Segments) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | $ 26,431 | $ 15,721 | $ 58,227 | $ 52,615
Depreciation | 6,108 | 5,579 | 17,946 | 16,494
Amortization | 10,837 | 9,813 | 31,806 | 28,611
Private Banks [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 12,707 | 7,797 | 31,317 | 26,105
Depreciation | 3,141 | 2,922 | 9,214 | 10,211
Amortization | 7,604 | 6,342 | 22,300 | 18,485
Investment Advisors [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 4,899 | 3,731 | 11,060 | 11,381
Depreciation | 864 | 759 | 2,527 | 1,762
Amortization | 2,512 | 2,341 | 7,371 | 6,825
Institutional Investors [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 1,955 | 239 | 3,970 | 3,169
Depreciation | 302 | 295 | 903 | 714
Amortization | 383 | 363 | 1,133 | 1,058
Investment Managers [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 5,286 | 3,115 | 9,128 | 8,337
Depreciation | 1,039 | 907 | 3,029 | 1,931
Amortization | 255 | 242 | 755 | 706
Investments In New Businesses [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 379 | 498 | 662 | 1,694
Depreciation | 572 | 511 | 1,706 | 1,461
Amortization | 26 | 468 | 76 | 1,366
Total From Business Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 25,226 | 15,380 | 56,137 | 50,686
Depreciation | 5,918 | 5,394 | 17,379 | 16,079
Amortization | 10,780 | 9,756 | 31,635 | 28,440
Corporate Overhead [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 1,205 | 341 | 2,090 | 1,929
Depreciation | 190 | 185 | 567 | 415
Amortization | $ 57 | $ 57 | $ 171 | $ 171

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