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Segment Reporting (Schedule Of Operating Information, Segment) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues |  | $ 793,449 | $ 738,342 | $ 742,732 | $ 750,358 | $ 804,085 | $ 721,169 | $ 725,647 | $ 675,531 | $ 3,024,881 | [1] | $ 2,926,432 | [1] | $ 2,575,496 | [1]
Income/(loss) before income taxes |  |  |  |  |  |  |  |  |  | 534,362 |  | 269,536 |  | 142,582 |
Global Wealth Management [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues | [1] |  |  |  |  |  |  |  |  | 1,990,319 |  | 1,822,218 |  | 1,563,410 |
Income/(loss) before income taxes |  |  |  |  |  |  |  |  |  | 737,003 |  | 626,906 |  | 430,318 |
Institutional Group [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues | [1] |  |  |  |  |  |  |  |  | 1,055,495 |  | 1,110,768 |  | 1,014,164 |
Income/(loss) before income taxes |  |  |  |  |  |  |  |  |  | 157,051 |  | 217,981 |  | 164,143 |
Other Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues | [1] |  |  |  |  |  |  |  |  | (20,933) |  | (6,554) |  | (2,078) |
Income/(loss) before income taxes |  |  |  |  |  |  |  |  |  | $ (359,692) |  | $ (575,351) |  | $ (451,879) |
[1] | No individual client accounted for more than 10 percent of total net revenues for the years ended December 31, 2018, 2017, and 2016.

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