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Segment Reporting (Schedule Of Operating Information, Segment) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Segment Reporting Information [Line Items] |  |  |  |  |
Net revenues | [1] | $ 883,300 | $ 821,572 | $ 2,692,151 | $ 2,392,779
Income/(loss) before income taxes |  | 158,393 | 150,754 | 416,459 | 436,545
Global Wealth Management [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net revenues | [1] | 526,836 | 534,571 | 1,615,574 | 1,577,614
Income/(loss) before income taxes |  | 178,930 | 202,823 | 529,422 | 589,665
Institutional Group [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net revenues | [1] | 363,365 | 290,222 | 1,093,699 | 822,110
Income/(loss) before income taxes |  | 76,841 | 48,623 | 201,630 | 120,129
Other Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net revenues | [1] | (6,901) | (3,221) | (17,122) | (6,945)
Income/(loss) before income taxes |  | $ (97,378) | $ (100,692) | $ (314,593) | $ (273,249)
[1] | No individual client accounted for more than 10 percent of total net revenues for the three and nine months ended September 30, 2020 or 2019.

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