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Business Segment Information (Schedule Of Financial Information About 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] |  |  |  |
Revenues | $ 386,018 | $ 354,641 | $ 1,118,333 | $ 1,032,735
Expenses | 271,288 | 241,482 | 782,522 | 712,342
Operating profit (loss) | 114,730 | 113,159 | 335,811 | 320,393
Gain on sale of subsidiary | 0 | 0 | 0 | 2,791
Segment profit (loss) | 114,730 | 113,159 | 335,811 | 323,184
Private Banks [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 118,499 | 115,952 | 347,317 | 344,149
Expenses | 115,806 | 105,523 | 336,709 | 312,126
Operating profit (loss) | 2,693 | 10,429 | 10,608 | 32,023
Gain on sale of subsidiary | 0 | 0 | 0 | 2,791
Segment profit (loss) | 2,693 | 10,429 | 10,608 | 34,814
Investment Advisors [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 94,318 | 85,258 | 275,302 | 243,820
Expenses | 50,585 | 45,080 | 147,504 | 134,575
Operating profit (loss) | 43,733 | 40,178 | 127,798 | 109,245
Gain on sale of subsidiary | 0 | 0 | 0 | 0
Segment profit (loss) | 43,733 | 40,178 | 127,798 | 109,245
Institutional Investors [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 80,411 | 76,222 | 235,483 | 223,793
Expenses | 40,003 | 36,943 | 117,499 | 108,875
Operating profit (loss) | 40,408 | 39,279 | 117,984 | 114,918
Gain on sale of subsidiary | 0 | 0 | 0 | 0
Segment profit (loss) | 40,408 | 39,279 | 117,984 | 114,918
Investment Managers [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 91,020 | 75,672 | 255,123 | 216,528
Expenses | 59,831 | 48,588 | 165,743 | 140,831
Operating profit (loss) | 31,189 | 27,084 | 89,380 | 75,697
Gain on sale of subsidiary | 0 | 0 | 0 | 0
Segment profit (loss) | 31,189 | 27,084 | 89,380 | 75,697
Investments In New Businesses [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 1,770 | 1,537 | 5,108 | 4,445
Expenses | 5,063 | 5,348 | 15,067 | 15,935
Operating profit (loss) | (3,293) | (3,811) | (9,959) | (11,490)
Gain on sale of subsidiary | 0 | 0 | 0 | 0
Segment profit (loss) | $ (3,293) | $ (3,811) | $ (9,959) | $ (11,490)

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