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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, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | $ 14,778 | $ 19,909 | $ 61,753 | $ 57,336
Depreciation | 7,945 | 7,409 | 23,058 | 22,162
Amortization | 13,200 | 12,947 | 39,417 | 38,407
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 14,504 | 19,246 | 59,684 | 55,702
Depreciation | 7,690 | 7,089 | 22,290 | 21,178
Amortization | 13,143 | 12,890 | 39,245 | 38,236
Operating Segments | Private Banks |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 7,652 | 8,018 | 24,211 | 25,240
Depreciation | 4,222 | 3,640 | 12,069 | 10,774
Amortization | 7,505 | 7,322 | 22,390 | 21,680
Operating Segments | Investment Advisors |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 3,234 | 4,468 | 12,427 | 12,973
Depreciation | 1,255 | 1,162 | 3,578 | 3,506
Amortization | 2,683 | 2,609 | 7,999 | 7,682
Operating Segments | Institutional Investors |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 698 | 1,070 | 3,085 | 2,990
Depreciation | 298 | 393 | 901 | 1,212
Amortization | 426 | 440 | 1,280 | 1,300
Operating Segments | Investment Managers |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 2,776 | 5,311 | 19,067 | 13,535
Depreciation | 1,818 | 1,793 | 5,499 | 5,384
Amortization | 2,343 | 2,334 | 7,020 | 7,019
Operating Segments | Investments In New Businesses |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 144 | 379 | 894 | 964
Depreciation | 97 | 101 | 243 | 302
Amortization | 186 | 185 | 556 | 555
Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 274 | 663 | 2,069 | 1,634
Depreciation | 255 | 320 | 768 | 984
Amortization | $ 57 | $ 57 | $ 172 | $ 171

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