Segment Reporting (Schedule Of Operating Information, Segment) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023
Segment Reporting Information [Line Items]
Net revenues	[1]	$ 1,163,038	$ 1,106,793
Income/(loss) before income taxes		218,691	209,883
Global Wealth Management [Member]
Segment Reporting Information [Line Items]
Net revenues	[1]	790,500	757,186
Income/(loss) before income taxes		290,748	316,109
Institutional Group [Member]
Segment Reporting Information [Line Items]
Net revenues	[1]	351,376	332,613
Income/(loss) before income taxes		37,109	33,720
Other Segments [Member]
Segment Reporting Information [Line Items]
Net revenues	[1]	21,162	16,994
Income/(loss) before income taxes		$ (109,166)	$ (139,946)

[1] No individual client accounted for more than 10 percent of total net revenues for the three months ended March 31, 2024 and 2023.