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Segment Reporting (Schedule Of Operating Information, Segment) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Segment Reporting Information [Line Items]    
Net revenues [1] $ 1,106,793 $ 1,116,527
Income/(loss) before income taxes 209,883 227,109
Global Wealth Management [Member]    
Segment Reporting Information [Line Items]    
Net revenues [1] 757,186 681,725
Income/(loss) before income taxes 316,109 225,413
Institutional Group [Member]    
Segment Reporting Information [Line Items]    
Net revenues [1] 332,613 431,363
Income/(loss) before income taxes 33,720 96,628
Other Segments [Member]    
Segment Reporting Information [Line Items]    
Net revenues [1] 16,994 3,439
Income/(loss) before income taxes $ (139,946) $ (94,932)
[1] No individual client accounted for more than 10 percent of total net revenues for the three months ended March 31, 2023 and 2022.