Segment Reporting (Schedule of Operating Information, Segment) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Segment Reporting Information [Line Items]
Net revenues	[1]	$ 1,045,139	$ 1,144,938	$ 3,269,792	$ 3,432,863
Income/(loss) before income taxes		205,769	256,502	651,419	748,419
Global Wealth Management [Member]
Segment Reporting Information [Line Items]
Net revenues	[1]	701,820	655,533	2,081,525	1,924,595
Income/(loss) before income taxes		279,935	232,119	750,500	682,655
Institutional Group [Member]
Segment Reporting Information [Line Items]
Net revenues	[1]	339,408	492,284	1,182,135	1,519,176
Income/(loss) before income taxes		40,000	125,092	209,620	383,774
Other Segments [Member]
Segment Reporting Information [Line Items]
Net revenues	[1]	(3,911)	(2,879)	6,132	(10,908)
Income/(loss) before income taxes		$ (114,166)	$ (100,709)	$ (308,701)	$ (318,010)

[1] No individual client accounted for more than 10 percent of total net revenues for the three and nine months ended September 30, 2022 and 2021.