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Business Segment Information (Schedule Of Financial Information About Business Segments) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Segment Reporting Information [Line Items] |  |
Revenues | $ 334,263 | $ 325,444
Expenses | 234,404 | 219,015
Operating profit (loss) | 99,859 | 106,429
Gain on sale of subsidiary | 2,791 | 2,791
Segment profit (loss) | 102,650 | 109,220
Private Banks [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 113,361 | 111,213
Expenses | 103,741 | 99,256
Operating profit (loss) | 9,620 | 11,957
Gain on sale of subsidiary | 2,791 | 2,791
Segment profit (loss) | 12,411 | 14,748
Investment Advisors [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 76,679 | 74,015
Expenses | 44,774 | 39,059
Operating profit (loss) | 31,905 | 34,956
Gain on sale of subsidiary | 0 | 0
Segment profit (loss) | 31,905 | 34,956
Institutional Investors [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 72,897 | 73,548
Expenses | 35,382 | 35,211
Operating profit (loss) | 37,515 | 38,337
Gain on sale of subsidiary | 0 | 0
Segment profit (loss) | 37,515 | 38,337
Investment Managers [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 69,918 | 65,367
Expenses | 45,275 | 40,623
Operating profit (loss) | 24,643 | 24,744
Gain on sale of subsidiary | 0 | 0
Segment profit (loss) | 24,643 | 24,744
Investments In New Businesses [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 1,408 | 1,301
Expenses | 5,232 | 4,866
Operating profit (loss) | (3,824) | (3,565)
Gain on sale of subsidiary | 0 | 0
Segment profit (loss) | $ (3,824) | $ (3,565)

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