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Business Segment Information (Schedule Of Additional Information Pertaining To Business Segments) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Segment Reporting Information [Line Items] |  |  |
Capital Expenditures | $ 59,143 | $ 72,834 | $ 52,536
Depreciation | 35,300 | 33,657 | 33,481
Amortization | 38,669 | 54,280 | 59,152
Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital Expenditures | 57,759 | 71,120 | 51,385
Depreciation | 34,433 | 32,944 | 32,463
Amortization | 38,388 | 54,017 | 58,828
Operating Segments | Private Banks |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital Expenditures | 19,331 | 32,454 | 26,472
Depreciation | 21,888 | 21,237 | 19,040
Amortization | 19,094 | 25,886 | 34,159
Operating Segments | Investment Advisors |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital Expenditures | 9,329 | 13,027 | 11,100
Depreciation | 2,040 | 1,933 | 3,646
Amortization | 7,620 | 9,905 | 11,654
Operating Segments | Institutional Investors |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital Expenditures | 1,639 | 3,884 | 2,614
Depreciation | 1,207 | 1,142 | 1,241
Amortization | 7,324 | 8,166 | 2,321
Operating Segments | Investment Managers |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital Expenditures | 26,643 | 20,968 | 10,275
Depreciation | 9,013 | 8,468 | 8,185
Amortization | 3,771 | 9,400 | 9,955
Operating Segments | Investments in New Businesses |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital Expenditures | 817 | 787 | 924
Depreciation | 285 | 164 | 351
Amortization | 579 | 660 | 739
Corporate Overhead |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital Expenditures | 1,384 | 1,714 | 1,151
Depreciation | 867 | 713 | 1,018
Amortization | $ 281 | $ 263 | $ 324

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