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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, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | $ 18,786 | $ 23,473 | $ 37,284 | $ 43,539
Depreciation | 7,138 | 6,599 | 14,260 | 13,399
Amortization | 12,161 | 12,565 | 24,015 | 24,587
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 18,420 | 23,081 | 36,610 | 42,995
Depreciation | 6,841 | 6,417 | 13,672 | 13,071
Amortization | 12,104 | 12,515 | 23,900 | 24,486
Operating Segments | Private Banks |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 9,529 | 9,479 | 19,768 | 22,329
Depreciation | 3,323 | 4,172 | 6,642 | 8,582
Amortization | 6,747 | 8,876 | 13,374 | 17,339
Operating Segments | Investment Advisors |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 4,284 | 3,698 | 8,544 | 8,230
Depreciation | 1,105 | 802 | 2,210 | 1,535
Amortization | 2,401 | 2,897 | 4,758 | 5,747
Operating Segments | Institutional Investors |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 997 | 1,086 | 1,964 | 1,897
Depreciation | 452 | 244 | 900 | 471
Amortization | 427 | 426 | 854 | 749
Operating Segments | Investment Managers |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 3,370 | 8,665 | 5,890 | 10,280
Depreciation | 1,806 | 1,028 | 3,615 | 1,944
Amortization | 2,345 | 275 | 4,690 | 491
Operating Segments | Investments In New Businesses |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 240 | 153 | 444 | 259
Depreciation | 155 | 171 | 305 | 539
Amortization | 184 | 41 | 224 | 160
Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 366 | 392 | 674 | 544
Depreciation | 297 | 182 | 588 | 328
Amortization | $ 57 | $ 50 | $ 115 | $ 101

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