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Business Segment Information (Schedule Of Additional Information Pertaining To Business Segments) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Segment Reporting Information [Line Items] |  |
Capital Expenditures | $ 27,120 | $ 17,254
Depreciation | 7,473 | 7,331
Amortization | 13,077 | 12,679
Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Capital Expenditures | 26,123 | 16,869
Depreciation | 7,217 | 6,995
Amortization | 13,020 | 12,621
Operating Segments | Private Banks |  |
Segment Reporting Information [Line Items] |  |
Capital Expenditures | 9,925 | 8,461
Depreciation | 3,882 | 3,549
Amortization | 7,421 | 7,141
Operating Segments | Investment Advisors |  |
Segment Reporting Information [Line Items] |  |
Capital Expenditures | 5,390 | 3,947
Depreciation | 1,151 | 1,179
Amortization | 2,652 | 2,523
Operating Segments | Institutional Investors |  |
Segment Reporting Information [Line Items] |  |
Capital Expenditures | 1,358 | 871
Depreciation | 302 | 405
Amortization | 427 | 433
Operating Segments | Investment Managers |  |
Segment Reporting Information [Line Items] |  |
Capital Expenditures | 9,032 | 3,349
Depreciation | 1,812 | 1,771
Amortization | 2,335 | 2,339
Operating Segments | Investments In New Businesses |  |
Segment Reporting Information [Line Items] |  |
Capital Expenditures | 418 | 241
Depreciation | 70 | 91
Amortization | 185 | 185
Corporate |  |
Segment Reporting Information [Line Items] |  |
Capital Expenditures | 997 | 385
Depreciation | 256 | 336
Amortization | $ 57 | $ 58

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