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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, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | $ 23,473 | $ 14,560 | $ 43,539 | $ 28,646
Depreciation | 6,599 | 6,434 | 13,399 | 12,881
Amortization | 12,565 | 11,284 | 24,587 | 22,296
Private Banks [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 9,479 | 8,454 | 22,329 | 17,166
Depreciation | 4,172 | 3,199 | 8,582 | 6,380
Amortization | 8,876 | 7,769 | 17,339 | 15,480
Investment Advisors [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 3,698 | 3,267 | 8,230 | 6,119
Depreciation | 802 | 964 | 1,535 | 1,940
Amortization | 2,897 | 2,585 | 5,747 | 5,138
Institutional Investors [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 1,086 | 696 | 1,897 | 1,492
Depreciation | 244 | 339 | 471 | 673
Amortization | 426 | 425 | 749 | 824
Investment Managers [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 8,665 | 1,743 | 10,280 | 3,065
Depreciation | 1,028 | 1,172 | 1,944 | 2,362
Amortization | 275 | 275 | 491 | 541
Investments In New Businesses [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 153 | 121 | 259 | 215
Depreciation | 171 | 547 | 539 | 1,095
Amortization | 41 | 40 | 160 | 66
Total From Business Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 23,081 | 14,281 | 42,995 | 28,057
Depreciation | 6,417 | 6,221 | 13,071 | 12,450
Amortization | 12,515 | 11,094 | 24,486 | 22,049
Corporate Overhead [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 392 | 279 | 544 | 589
Depreciation | 182 | 213 | 328 | 431
Amortization | $ 50 | $ 190 | $ 101 | $ 247

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