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Business Segment Information (Schedule Of Additional Information Pertaining To Business Segments) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Segment Reporting Information [Line Items] |  |
Capital Expenditures | $ 20,066 | $ 14,086
Depreciation | 6,800 | 6,447
Amortization | 12,022 | 11,012
Private Banks [Member] |  |
Segment Reporting Information [Line Items] |  |
Capital Expenditures | 12,850 | 8,712
Depreciation | 4,410 | 3,181
Amortization | 8,464 | 7,711
Investment Advisors [Member] |  |
Segment Reporting Information [Line Items] |  |
Capital Expenditures | 4,532 | 2,852
Depreciation | 733 | 976
Amortization | 2,850 | 2,553
Institutional Investors [Member] |  |
Segment Reporting Information [Line Items] |  |
Capital Expenditures | 811 | 796
Depreciation | 227 | 334
Amortization | 323 | 399
Investment Managers [Member] |  |
Segment Reporting Information [Line Items] |  |
Capital Expenditures | 1,615 | 1,322
Depreciation | 916 | 1,190
Amortization | 216 | 266
Investments In New Businesses [Member] |  |
Segment Reporting Information [Line Items] |  |
Capital Expenditures | 106 | 94
Depreciation | 368 | 548
Amortization | 119 | 26
Total From Business Segments [Member] |  |
Segment Reporting Information [Line Items] |  |
Capital Expenditures | 19,914 | 13,776
Depreciation | 6,654 | 6,229
Amortization | 11,972 | 10,955
Corporate Overhead [Member] |  |
Segment Reporting Information [Line Items] |  |
Capital Expenditures | 152 | 310
Depreciation | 146 | 218
Amortization | $ 50 | $ 57

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