Segment Reporting (Schedule Of Operating Information, Segment) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2022	Mar. 31, 2021
Segment Reporting Information [Line Items]
Net revenues	[1]	$ 1,116,527	$ 1,134,789
Income/(loss) before income taxes		227,109	227,892
Global Wealth Management [Member]
Segment Reporting Information [Line Items]
Net revenues	[1]	681,725	631,495
Income/(loss) before income taxes		225,413	223,231
Institutional Group [Member]
Segment Reporting Information [Line Items]
Net revenues	[1]	431,363	506,081
Income/(loss) before income taxes		96,628	117,188
Other Segments [Member]
Segment Reporting Information [Line Items]
Net revenues	[1]	(3,439)	(2,787)
Income/(loss) before income taxes		$ (94,932)	$ (112,527)

[1] No individual client accounted for more than 10 percent of total net revenues for the three months ended March 31, 2022 and 2021.