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Business Segment Information (Schedule Of Additional Information Pertaining To Business Segments) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Segment Reporting Information [Line Items] |  |
Capital Expenditures | $ 18,498 | $ 20,066
Depreciation | 7,122 | 6,800
Amortization | 11,854 | 12,022
Operating Segments [Member] |  |
Segment Reporting Information [Line Items] |  |
Capital Expenditures | 18,190 | 19,914
Depreciation | 6,831 | 6,654
Amortization | 11,796 | 11,972
Operating Segments [Member] | Private Banks [Member] |  |
Segment Reporting Information [Line Items] |  |
Capital Expenditures | 10,239 | 12,850
Depreciation | 3,319 | 4,410
Amortization | 6,627 | 8,464
Operating Segments [Member] | Investment Advisors [Member] |  |
Segment Reporting Information [Line Items] |  |
Capital Expenditures | 4,260 | 4,532
Depreciation | 1,105 | 733
Amortization | 2,357 | 2,850
Operating Segments [Member] | Institutional Investors [Member] |  |
Segment Reporting Information [Line Items] |  |
Capital Expenditures | 967 | 811
Depreciation | 448 | 227
Amortization | 427 | 323
Operating Segments [Member] | Investment Managers [Member] |  |
Segment Reporting Information [Line Items] |  |
Capital Expenditures | 2,520 | 1,615
Depreciation | 1,809 | 916
Amortization | 2,345 | 216
Operating Segments [Member] | Investments In New Businesses [Member] |  |
Segment Reporting Information [Line Items] |  |
Capital Expenditures | 204 | 106
Depreciation | 150 | 368
Amortization | 40 | 119
Corporate, Non-Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Capital Expenditures | 308 | 152
Depreciation | 291 | 146
Amortization | $ 58 | $ 50

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