Segment Reporting (Schedule Of Operating Information, Segment) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Net revenues	[1]	$ 1,144,938	$ 883,300	$ 3,432,863	$ 2,692,151
Income/(loss) before income taxes		256,502	158,393	748,419	416,459
Global Wealth Management [Member]
Segment Reporting Information [Line Items]
Net revenues	[1]	655,533	526,836	1,924,595	1,615,574
Income/(loss) before income taxes		232,119	178,930	682,655	529,422
Institutional Group [Member]
Segment Reporting Information [Line Items]
Net revenues	[1]	492,284	363,365	1,519,176	1,093,699
Income/(loss) before income taxes		125,092	76,841	383,774	201,630
Other Segments [Member]
Segment Reporting Information [Line Items]
Net revenues	[1]	(2,879)	(6,901)	(10,908)	(17,122)
Income/(loss) before income taxes		$ (100,709)	$ (97,378)	$ (318,010)	$ (314,593)

[1] No individual client accounted for more than 10 percent of total net revenues for the three and nine months ended September 30, 2021 or 2020.