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Business Segment Information (Schedule Of Additional Information Pertaining To Business Segments) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Segment Reporting Information [Line Items] |  |  |  |
Capital expenditure | $ 15,229 | $ 17,758 | $ 34,850 | $ 33,630
Depreciation | 8,781 | 8,286 | 17,312 | 16,384
Amortization | 9,630 | 16,508 | 19,054 | 33,395
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital expenditure | 14,867 | 17,313 | 33,873 | 32,740
Depreciation | 8,575 | 8,107 | 16,902 | 16,022
Amortization | 9,565 | 16,438 | 18,925 | 33,254
Operating Segments | Private Banks |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital expenditure | 8,001 | 8,541 | 17,072 | 15,763
Depreciation | 5,450 | 5,554 | 10,804 | 10,660
Amortization | 4,718 | 8,261 | 9,364 | 16,800
Operating Segments | Investment Advisors |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital expenditure | 3,615 | 3,423 | 7,954 | 6,450
Depreciation | 549 | 469 | 1,017 | 925
Amortization | 1,945 | 3,158 | 3,763 | 6,391
Operating Segments | Institutional Investors |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital expenditure | 457 | 1,028 | 1,105 | 1,977
Depreciation | 303 | 285 | 585 | 574
Amortization | 1,829 | 2,257 | 3,653 | 4,540
Operating Segments | Investment Managers |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital expenditure | 2,592 | 4,113 | 7,198 | 8,137
Depreciation | 2,210 | 1,755 | 4,365 | 3,775
Amortization | 929 | 2,577 | 1,856 | 5,153
Operating Segments | Investments In New Businesses |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital expenditure | 202 | 208 | 544 | 413
Depreciation | 63 | 44 | 131 | 88
Amortization | 144 | 185 | 289 | 370
Corporate overhead |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital expenditure | 362 | 445 | 977 | 890
Depreciation | 206 | 179 | 410 | 362
Amortization | $ 65 | $ 70 | $ 129 | $ 141

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