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Segment Reporting (Schedule Of Operating Information, Segment) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Segment Reporting Information [Line Items] |  |  |  |  |
Net revenues | [1] | $ 895,817 | $ 800,787 | $ 1,808,851 | $ 1,571,207
Income/(loss) before income taxes |  | 142,960 | 147,982 | 258,066 | 285,791
Global Wealth Management [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net revenues | [1] | 505,782 | 532,433 | 1,088,738 | 1,043,043
Income/(loss) before income taxes |  | 156,325 | 192,352 | 350,492 | 386,842
Institutional Group [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net revenues | [1] | 398,096 | 270,602 | 730,334 | 531,888
Income/(loss) before income taxes |  | 83,049 | 39,302 | 124,789 | 71,506
Other Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net revenues | [1] | (8,061) | (2,248) | (10,221) | (3,724)
Income/(loss) before income taxes |  | $ (96,414) | $ (83,672) | $ (217,215) | $ (172,557)
[1] | No individual client accounted for more than 10 percent of total net revenues for the three and six months ended June 30, 2020 or 2019.

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