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Business Segment Information (Schedule Of Financial Information About Business Segments) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Segment Reporting Information [Line Items] |  |
Revenues | $ 359,984 | $ 334,263
Expenses | 251,862 | 234,404
Operating profit (loss) | 108,122 | 99,859
Gain on sale of subsidiary | 0 | 2,791
Segment profit (loss) | 108,122 | 102,650
Private Banks [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 112,634 | 113,361
Expenses | 108,550 | 103,741
Operating profit (loss) | 4,084 | 9,620
Gain on sale of subsidiary | 0 | 2,791
Segment profit (loss) | 4,084 | 12,411
Investment Advisors [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 88,238 | 76,679
Expenses | 47,539 | 44,774
Operating profit (loss) | 40,699 | 31,905
Gain on sale of subsidiary | 0 | 0
Segment profit (loss) | 40,699 | 31,905
Institutional Investors [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 77,004 | 72,897
Expenses | 38,828 | 35,382
Operating profit (loss) | 38,176 | 37,515
Gain on sale of subsidiary | 0 | 0
Segment profit (loss) | 38,176 | 37,515
Investment Managers [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 80,487 | 69,918
Expenses | 52,065 | 45,275
Operating profit (loss) | 28,422 | 24,643
Gain on sale of subsidiary | 0 | 0
Segment profit (loss) | 28,422 | 24,643
Investments In New Businesses [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 1,621 | 1,408
Expenses | 4,880 | 5,232
Operating profit (loss) | (3,259) | (3,824)
Gain on sale of subsidiary | 0 | 0
Segment profit (loss) | $ (3,259) | $ (3,824)

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