Segment Reporting (Schedule Of Operating Information, Segment) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Segment Reporting Information [Line Items]
Net revenues		$ 1,217,932	$ 1,050,721	$ 2,380,970	$ 2,157,514
Income/(loss) before income taxes		226,894	181,385	445,585	391,268
Global Wealth Management [Member]
Segment Reporting Information [Line Items]
Net revenues	[1]	801,135	758,190	1,591,635	1,515,376
Income/(loss) before income taxes		299,173	299,904	589,921	616,013
Institutional Group [Member]
Segment Reporting Information [Line Items]
Net revenues	[1]	390,721	277,524	742,097	610,137
Income/(loss) before income taxes		48,813	(11,593)	85,922	22,133
Other Segments [Member]
Segment Reporting Information [Line Items]
Net revenues	[1]	26,076	15,007	47,238	32,001
Income/(loss) before income taxes		$ (121,092)	$ (106,926)	$ (230,258)	$ (246,878)

[1] No individual client accounted for more than 10 percent of total net revenues for the three and six months ended June 30, 2024 and 2023.