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Segment Reporting (Schedule Of Operating Information, Segment) (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] |  |  |  |  |
Net revenues | [1] | $ 721,169 | $ 641,986 | $ 2,122,347 | $ 1,914,105
Income/(loss) before income taxes |  | 108,139 | 27,982 | 270,356 | 87,688
Global Wealth Management [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net revenues | [1] | 453,558 | 390,032 | 1,348,280 | 1,155,875
Income/(loss) before income taxes |  | 161,756 | 109,079 | 457,045 | 307,466
Institutional Group [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net revenues | [1] | 264,747 | 258,800 | 778,367 | 760,996
Income/(loss) before income taxes |  | 51,717 | 44,923 | 144,481 | 116,628
Other [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net revenues | [1] | 2,864 | (6,846) | (4,300) | (2,766)
Income/(loss) before income taxes |  | $ (105,334) | $ (126,020) | $ (331,170) | $ (336,406)
[1] | No individual client accounted for more than 10 percent of total net revenues for the three and nine months ended September 30, 2017 or 2016.

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