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Business Segment Information (Schedule Of Additional Information Pertaining To Business Segments) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Segment Reporting Information [Line Items] |  |  |
Capital Expenditures | $ 72,834 | $ 52,536 | $ 78,567
Depreciation | 33,657 | 33,481 | 30,959
Amortization | 54,280 | 59,152 | 52,975
Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital Expenditures | 71,120 | 51,385 | 75,727
Depreciation | 32,944 | 32,463 | 29,918
Amortization | 54,017 | 58,828 | 52,745
Operating Segments | Private Banks |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital Expenditures | 32,454 | 26,472 | 29,061
Depreciation | 21,237 | 19,040 | 16,206
Amortization | 25,886 | 34,159 | 30,240
Operating Segments | Investment Advisors |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital Expenditures | 13,027 | 11,100 | 15,588
Depreciation | 1,933 | 3,646 | 4,821
Amortization | 9,905 | 11,654 | 10,694
Operating Segments | Institutional Investors |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital Expenditures | 3,884 | 2,614 | 3,958
Depreciation | 1,142 | 1,241 | 1,214
Amortization | 8,166 | 2,321 | 1,707
Operating Segments | Investment Managers |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital Expenditures | 20,968 | 10,275 | 25,909
Depreciation | 8,468 | 8,185 | 7,336
Amortization | 9,400 | 9,955 | 9,365
Operating Segments | Investments in New Businesses |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital Expenditures | 787 | 924 | 1,211
Depreciation | 164 | 351 | 341
Amortization | 660 | 739 | 739
Corporate Overhead |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital Expenditures | 1,714 | 1,151 | 2,840
Depreciation | 713 | 1,018 | 1,041
Amortization | $ 263 | $ 324 | $ 230

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