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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, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | $ 19,855 | $ 20,173 | $ 46,975 | $ 37,427
Depreciation | 7,640 | 7,422 | 15,113 | 14,753
Amortization | 13,140 | 12,781 | 26,217 | 25,460
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 19,057 | 19,587 | 45,180 | 36,456
Depreciation | 7,383 | 7,094 | 14,600 | 14,089
Amortization | 13,082 | 12,725 | 26,102 | 25,346
Operating Segments | Private Banks |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 6,634 | 8,761 | 16,559 | 17,222
Depreciation | 3,965 | 3,585 | 7,847 | 7,134
Amortization | 7,464 | 7,217 | 14,885 | 14,358
Operating Segments | Investment Advisors |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 3,803 | 4,558 | 9,193 | 8,505
Depreciation | 1,172 | 1,165 | 2,323 | 2,344
Amortization | 2,664 | 2,550 | 5,316 | 5,073
Operating Segments | Institutional Investors |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 1,029 | 1,049 | 2,387 | 1,920
Depreciation | 301 | 414 | 603 | 819
Amortization | 427 | 427 | 854 | 860
Operating Segments | Investment Managers |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 7,259 | 4,875 | 16,291 | 8,224
Depreciation | 1,869 | 1,820 | 3,681 | 3,591
Amortization | 2,342 | 2,346 | 4,677 | 4,685
Operating Segments | Investments In New Businesses |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 332 | 344 | 750 | 585
Depreciation | 76 | 110 | 146 | 201
Amortization | 185 | 185 | 370 | 370
Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 798 | 586 | 1,795 | 971
Depreciation | 257 | 328 | 513 | 664
Amortization | $ 58 | $ 56 | $ 115 | $ 114

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