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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, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | $ 17,739 | $ 25,352 | $ 55,023 | $ 68,891
Depreciation | 7,255 | 6,948 | 21,515 | 20,347
Amortization | 12,405 | 13,745 | 36,420 | 38,332
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 17,279 | 24,975 | 53,889 | 67,970
Depreciation | 6,938 | 6,740 | 20,610 | 19,811
Amortization | 12,347 | 13,695 | 36,247 | 38,181
Operating Segments | Private Banks |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 7,999 | 14,671 | 27,767 | 37,000
Depreciation | 3,427 | 4,374 | 10,069 | 12,956
Amortization | 6,943 | 9,125 | 20,317 | 26,464
Operating Segments | Investment Advisors |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 3,927 | 5,421 | 12,471 | 13,651
Depreciation | 1,168 | 759 | 3,378 | 2,294
Amortization | 2,445 | 2,973 | 7,203 | 8,720
Operating Segments | Institutional Investors |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 962 | 1,260 | 2,926 | 3,157
Depreciation | 410 | 248 | 1,310 | 719
Amortization | 427 | 425 | 1,281 | 1,174
Operating Segments | Investment Managers |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 4,104 | 3,450 | 9,994 | 13,730
Depreciation | 1,796 | 1,197 | 5,411 | 3,141
Amortization | 2,346 | 1,132 | 7,036 | 1,623
Operating Segments | Investments In New Businesses |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 287 | 173 | 731 | 432
Depreciation | 137 | 162 | 442 | 701
Amortization | 186 | 40 | 410 | 200
Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 460 | 377 | 1,134 | 921
Depreciation | 317 | 208 | 905 | 536
Amortization | $ 58 | $ 50 | $ 173 | $ 151

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