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Business Segment Information (Schedule Of Additional Information Pertaining To Business Segments) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Segment Reporting Information [Line Items] |  |
Capital Expenditures | $ 14,086 | $ 15,375
Depreciation | 6,447 | 5,995
Amortization | 11,012 | 10,358
Private Banks [Member] |  |
Segment Reporting Information [Line Items] |  |
Capital Expenditures | 8,712 | 8,502
Depreciation | 3,181 | 3,097
Amortization | 7,711 | 7,251
Investment Advisors [Member] |  |
Segment Reporting Information [Line Items] |  |
Capital Expenditures | 2,852 | 3,318
Depreciation | 976 | 838
Amortization | 2,553 | 2,400
Institutional Investors [Member] |  |
Segment Reporting Information [Line Items] |  |
Capital Expenditures | 796 | 947
Depreciation | 334 | 303
Amortization | 399 | 375
Investment Managers [Member] |  |
Segment Reporting Information [Line Items] |  |
Capital Expenditures | 1,322 | 2,048
Depreciation | 1,190 | 999
Amortization | 266 | 250
Investments In New Businesses [Member] |  |
Segment Reporting Information [Line Items] |  |
Capital Expenditures | 94 | 151
Depreciation | 548 | 563
Amortization | 26 | 25
Total From Business Segments [Member] |  |
Segment Reporting Information [Line Items] |  |
Capital Expenditures | 13,776 | 14,966
Depreciation | 6,229 | 5,800
Amortization | 10,955 | 10,301
Corporate Overhead [Member] |  |
Segment Reporting Information [Line Items] |  |
Capital Expenditures | 310 | 409
Depreciation | 218 | 195
Amortization | $ 57 | $ 57

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