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Business Segment Information (Schedule Of Additional Information Pertaining To Business Segments) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Segment Reporting Information [Line Items] |  |
Capital expenditure | $ 19,621 | $ 15,872
Depreciation | 8,531 | 8,098
Amortization | 9,424 | 16,887
Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Capital expenditure | 19,006 | 15,427
Depreciation | 8,327 | 7,915
Amortization | 9,360 | 16,816
Operating Segments | Private Banks |  |
Segment Reporting Information [Line Items] |  |
Capital expenditure | 9,071 | 7,222
Depreciation | 5,354 | 5,106
Amortization | 4,646 | 8,539
Operating Segments | Investment Advisors |  |
Segment Reporting Information [Line Items] |  |
Capital expenditure | 4,339 | 3,027
Depreciation | 468 | 456
Amortization | 1,818 | 3,233
Operating Segments | Institutional Investors |  |
Segment Reporting Information [Line Items] |  |
Capital expenditure | 648 | 949
Depreciation | 282 | 289
Amortization | 1,824 | 2,283
Operating Segments | Investment Managers |  |
Segment Reporting Information [Line Items] |  |
Capital expenditure | 4,606 | 4,024
Depreciation | 2,155 | 2,020
Amortization | 927 | 2,576
Operating Segments | Investments In New Businesses |  |
Segment Reporting Information [Line Items] |  |
Capital expenditure | 342 | 205
Depreciation | 68 | 44
Amortization | 145 | 185
Corporate overhead |  |
Segment Reporting Information [Line Items] |  |
Capital expenditure | 615 | 445
Depreciation | 204 | 183
Amortization | $ 64 | $ 71

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