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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, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | $ 17,162 | $ 19,855 | $ 27,740 | $ 46,975
Depreciation | 8,424 | 7,640 | 16,733 | 15,113
Amortization | 14,723 | 13,140 | 29,075 | 26,217
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 16,744 | 19,057 | 27,162 | 45,180
Depreciation | 8,075 | 7,383 | 16,053 | 14,600
Amortization | 14,598 | 13,082 | 28,892 | 26,102
Operating Segments | Private Banks |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 8,594 | 6,634 | 14,423 | 16,559
Depreciation | 4,178 | 3,965 | 8,310 | 7,847
Amortization | 8,633 | 7,464 | 17,209 | 14,885
Operating Segments | Investment Advisors |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 3,580 | 3,803 | 5,888 | 9,193
Depreciation | 1,417 | 1,172 | 2,706 | 2,323
Amortization | 2,909 | 2,664 | 5,536 | 5,316
Operating Segments | Institutional Investors |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 884 | 1,029 | 1,395 | 2,387
Depreciation | 353 | 301 | 711 | 603
Amortization | 427 | 427 | 853 | 854
Operating Segments | Investment Managers |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 3,373 | 7,259 | 5,004 | 16,291
Depreciation | 2,027 | 1,869 | 4,080 | 3,681
Amortization | 2,444 | 2,342 | 4,924 | 4,677
Operating Segments | Investments In New Businesses |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 313 | 332 | 452 | 750
Depreciation | 100 | 76 | 246 | 146
Amortization | 185 | 185 | 370 | 370
Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 418 | 798 | 578 | 1,795
Depreciation | 349 | 257 | 680 | 513
Amortization | $ 125 | $ 58 | $ 183 | $ 115

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