Segment Reporting (Schedule Of Operating Information, Segment) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Segment Reporting Information [Line Items]
Net revenues		$ 1,050,721	$ 1,108,126	$ 2,157,514	$ 2,224,653
Income/(loss) before income taxes		181,385	218,541	391,268	445,650
Global Wealth Management [Member]
Segment Reporting Information [Line Items]
Net revenues	[1]	758,190	697,980	1,515,376	1,379,705
Income/(loss) before income taxes		299,904	245,152	616,013	470,565
Institutional Group [Member]
Segment Reporting Information [Line Items]
Net revenues	[1]	276,244	411,364	608,857	842,727
Income/(loss) before income taxes		(12,895)	72,992	20,825	169,620
Other Segments [Member]
Segment Reporting Information [Line Items]
Net revenues	[1]	16,287	(1,218)	33,281	2,221
Income/(loss) before income taxes		$ (105,624)	$ (99,603)	$ (245,570)	$ (194,535)

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