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Business Segment Information (Schedule Of Financial Information About 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] |  |  |  |
Revenues | $ 372,331 | $ 343,831 | $ 732,315 | $ 678,094
Expenses | 259,372 | 236,456 | 511,234 | 470,860
Operating profit (loss) | 112,959 | 107,375 | 221,081 | 207,234
Gain on sale of subsidiary | 0 | 0 | 0 | 2,791
Segment profit (loss) | 112,959 | 107,375 | 221,081 | 210,025
Private Banks [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 116,184 | 114,836 | 228,818 | 228,197
Expenses | 112,353 | 102,862 | 220,903 | 206,603
Operating profit (loss) | 3,831 | 11,974 | 7,915 | 21,594
Gain on sale of subsidiary | 0 | 0 | 0 | 2,791
Segment profit (loss) | 3,831 | 11,974 | 7,915 | 24,385
Investment Advisors [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 92,746 | 81,883 | 180,984 | 158,562
Expenses | 49,380 | 44,721 | 96,919 | 89,495
Operating profit (loss) | 43,366 | 37,162 | 84,065 | 69,067
Gain on sale of subsidiary | 0 | 0 | 0 | 0
Segment profit (loss) | 43,366 | 37,162 | 84,065 | 69,067
Institutional Investors [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 78,068 | 74,674 | 155,072 | 147,571
Expenses | 38,668 | 36,550 | 77,496 | 71,932
Operating profit (loss) | 39,400 | 38,124 | 77,576 | 75,639
Gain on sale of subsidiary | 0 | 0 | 0 | 0
Segment profit (loss) | 39,400 | 38,124 | 77,576 | 75,639
Investment Managers [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 83,616 | 70,938 | 164,103 | 140,856
Expenses | 53,847 | 46,968 | 105,912 | 92,243
Operating profit (loss) | 29,769 | 23,970 | 58,191 | 48,613
Gain on sale of subsidiary | 0 | 0 | 0 | 0
Segment profit (loss) | 29,769 | 23,970 | 58,191 | 48,613
Investments In New Businesses [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 1,717 | 1,500 | 3,338 | 2,908
Expenses | 5,124 | 5,355 | 10,004 | 10,587
Operating profit (loss) | (3,407) | (3,855) | (6,666) | (7,679)
Gain on sale of subsidiary | 0 | 0 | 0 | 0
Segment profit (loss) | $ (3,407) | $ (3,855) | $ (6,666) | $ (7,679)

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