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Segment Reporting (Schedule Of Operating Information, Segment) (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2016 USD ($) Segment | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of reporting segments | Segment |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |
Net revenues |  | $ 661,391 | $ 641,986 | $ 652,145 | $ 619,974 | $ 581,286 | $ 591,575 | $ 597,751 | $ 560,982 | $ 2,575,496 | [1] | $ 2,331,594 | [1] | $ 2,208,424 | [1]
Income/(loss) before income taxes |  |  |  |  |  |  |  |  |  | $ 142,582 |  | $ 141,567 |  | $ 290,794 |
Net revenues accounted for by individual client, maximum percentage |  |  |  |  |  |  |  |  |  | 10.00% |  | 10.00% |  | 10.00% |
Global Wealth Management [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of operating segments | Segment |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |
Net revenues | [1] |  |  |  |  |  |  |  |  | $ 1,563,410 |  | $ 1,377,313 |  | $ 1,232,651 |
Income/(loss) before income taxes |  |  |  |  |  |  |  |  |  | 430,318 |  | 382,126 |  | 346,978 |
Institutional Group [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues | [1] |  |  |  |  |  |  |  |  | 1,014,164 |  | 975,594 |  | 997,071 |
Income/(loss) before income taxes |  |  |  |  |  |  |  |  |  | 164,143 |  | 141,042 |  | 165,546 |
Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues | [1] |  |  |  |  |  |  |  |  | (2,078) |  | (21,313) |  | (21,298) |
Income/(loss) before income taxes |  |  |  |  |  |  |  |  |  | $ (451,879) |  | $ (381,601) |  | $ (221,730) |
[1] | No individual client accounted for more than 10 percent of total net revenues for the years ended December 31, 2016, 2015, and 2014.

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