Segment Reporting (Schedule Of Operating Information, Segment) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Segment Reporting Information [Line Items]
Net revenues		$ 1,045,051	$ 1,045,139	$ 3,202,565	$ 3,269,792
Income/(loss) before income taxes		109,429	205,769	500,697	651,419
Global Wealth Management [Member]
Segment Reporting Information [Line Items]
Net revenues	[1]	768,558	701,820	2,283,934	2,081,525
Income/(loss) before income taxes		298,449	279,935	914,462	750,500
Institutional Group [Member]
Segment Reporting Information [Line Items]
Net revenues	[1]	256,888	339,408	867,025	1,182,135
Income/(loss) before income taxes		(27,804)	40,000	(5,671)	209,620
Other Segments [Member]
Segment Reporting Information [Line Items]
Net revenues	[1]	19,605	3,911	51,606	6,132
Income/(loss) before income taxes		$ (161,216)	$ (114,166)	$ (408,094)	$ (308,701)

[1] No individual client accounted for more than 10 percent of total net revenues for the three and nine months ended September 30, 2023 and 2022.