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Business Segment Information (Schedule Of Additional Information Pertaining To Business Segments) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Segment Reporting Information [Line Items] |  |
Capital Expenditures | $ 17,254 | $ 18,498
Depreciation | 7,331 | 7,122
Amortization | 12,679 | 11,854
Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Capital Expenditures | 16,869 | 18,190
Depreciation | 6,995 | 6,831
Amortization | 12,621 | 11,796
Operating Segments | Private Banks |  |
Segment Reporting Information [Line Items] |  |
Capital Expenditures | 8,461 | 10,239
Depreciation | 3,549 | 3,319
Amortization | 7,141 | 6,627
Operating Segments | Investment Advisors |  |
Segment Reporting Information [Line Items] |  |
Capital Expenditures | 3,947 | 4,260
Depreciation | 1,179 | 1,105
Amortization | 2,523 | 2,357
Operating Segments | Institutional Investors |  |
Segment Reporting Information [Line Items] |  |
Capital Expenditures | 871 | 967
Depreciation | 405 | 448
Amortization | 433 | 427
Operating Segments | Investment Managers |  |
Segment Reporting Information [Line Items] |  |
Capital Expenditures | 3,349 | 2,520
Depreciation | 1,771 | 1,809
Amortization | 2,339 | 2,345
Operating Segments | Investments In New Businesses |  |
Segment Reporting Information [Line Items] |  |
Capital Expenditures | 241 | 204
Depreciation | 91 | 150
Amortization | 185 | 40
Corporate |  |
Segment Reporting Information [Line Items] |  |
Capital Expenditures | 385 | 308
Depreciation | 336 | 291
Amortization | $ 58 | $ 58

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