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Business Segment Information (Schedule Of Additional Information Pertaining To Business Segments) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Segment Reporting Information [Line Items] |  |
Capital expenditure | $ 15,872 | $ 10,578
Depreciation | 8,098 | 8,309
Amortization | 16,887 | 14,352
Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Capital expenditure | 15,427 | 10,418
Depreciation | 7,915 | 7,978
Amortization | 16,816 | 14,294
Operating Segments | Private Banks |  |
Segment Reporting Information [Line Items] |  |
Capital expenditure | 7,222 | 5,829
Depreciation | 5,106 | 4,132
Amortization | 8,539 | 8,576
Operating Segments | Investment Advisors |  |
Segment Reporting Information [Line Items] |  |
Capital expenditure | 3,027 | 2,308
Depreciation | 456 | 1,289
Amortization | 3,233 | 2,627
Operating Segments | Institutional Investors |  |
Segment Reporting Information [Line Items] |  |
Capital expenditure | 949 | 511
Depreciation | 289 | 358
Amortization | 2,283 | 426
Operating Segments | Investment Managers |  |
Segment Reporting Information [Line Items] |  |
Capital expenditure | 4,024 | 1,631
Depreciation | 2,020 | 2,053
Amortization | 2,576 | 2,480
Operating Segments | Investments In New Businesses |  |
Segment Reporting Information [Line Items] |  |
Capital expenditure | 205 | 139
Depreciation | 44 | 146
Amortization | 185 | 185
Corporate |  |
Segment Reporting Information [Line Items] |  |
Capital expenditure | 445 | 160
Depreciation | 183 | 331
Amortization | $ 71 | $ 58

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