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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, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | $ 25,352 | $ 31,206 | $ 68,891 | $ 59,852
Depreciation | 6,948 | 6,576 | 20,347 | 19,457
Amortization | 13,745 | 11,388 | 38,332 | 33,684
Private Banks [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 14,671 | 15,018 | 37,000 | 32,184
Depreciation | 4,374 | 3,289 | 12,956 | 9,669
Amortization | 9,125 | 7,972 | 26,464 | 23,452
Investment Advisors [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 5,421 | 6,744 | 13,651 | 12,863
Depreciation | 759 | 940 | 2,294 | 2,880
Amortization | 2,973 | 2,626 | 8,720 | 7,764
Institutional Investors [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 1,260 | 1,744 | 3,157 | 3,236
Depreciation | 248 | 344 | 719 | 1,017
Amortization | 425 | 425 | 1,174 | 1,249
Investment Managers [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 3,450 | 6,210 | 13,730 | 9,275
Depreciation | 1,197 | 1,228 | 3,141 | 3,590
Amortization | 1,132 | 275 | 1,623 | 816
Investments In New Businesses [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 173 | 379 | 432 | 594
Depreciation | 162 | 549 | 701 | 1,644
Amortization | 40 | 40 | 200 | 106
Total From Business Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 24,975 | 30,095 | 67,970 | 58,152
Depreciation | 6,740 | 6,350 | 19,811 | 18,800
Amortization | 13,695 | 11,338 | 38,181 | 33,387
Corporate Overhead [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 377 | 1,111 | 921 | 1,700
Depreciation | 208 | 226 | 536 | 657
Amortization | $ 50 | $ 50 | $ 151 | $ 297

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