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Business Segment Information (Schedule Of Additional Information Pertaining To Business Segments) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | $ 14,266 | $ 14,778 | $ 42,006 | $ 61,753
Depreciation | 8,408 | 7,945 | 25,141 | 23,058
Amortization | 14,674 | 13,200 | 43,749 | 39,417
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 13,847 | 14,504 | 41,009 | 59,684
Depreciation | 8,238 | 7,690 | 24,291 | 22,290
Amortization | 14,603 | 13,143 | 43,495 | 39,245
Operating Segments | Private Banks |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 6,173 | 7,652 | 20,596 | 24,211
Depreciation | 4,980 | 4,222 | 13,290 | 12,069
Amortization | 8,526 | 7,505 | 25,735 | 22,390
Operating Segments | Investment Advisors |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 2,896 | 3,234 | 8,784 | 12,427
Depreciation | 499 | 1,255 | 3,205 | 3,578
Amortization | 3,014 | 2,683 | 8,550 | 7,999
Operating Segments | Institutional Investors |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 720 | 698 | 2,115 | 3,085
Depreciation | 271 | 298 | 982 | 901
Amortization | 427 | 426 | 1,280 | 1,280
Operating Segments | Investment Managers |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 3,722 | 2,776 | 8,726 | 19,067
Depreciation | 2,428 | 1,818 | 6,508 | 5,499
Amortization | 2,451 | 2,343 | 7,375 | 7,020
Operating Segments | Investments In New Businesses |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 336 | 144 | 788 | 894
Depreciation | 60 | 97 | 306 | 243
Amortization | 185 | 186 | 555 | 556
Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 419 | 274 | 997 | 2,069
Depreciation | 170 | 255 | 850 | 768
Amortization | $ 71 | $ 57 | $ 254 | $ 172

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