Segment Reporting (Schedule of Operating Information, Segment) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Segment Reporting Information [Line Items]
Net revenues	[1]	$ 1,108,126	$ 1,153,136	$ 2,224,653	$ 2,287,925
Income/(loss) before income taxes		218,541	264,025	445,650	491,917
Global Wealth Management [Member]
Segment Reporting Information [Line Items]
Net revenues	[1]	697,980	637,567	1,379,705	1,269,062
Income/(loss) before income taxes		245,152	227,305	470,565	450,536
Institutional Group [Member]
Segment Reporting Information [Line Items]
Net revenues	[1]	411,364	520,811	842,727	1,026,892
Income/(loss) before income taxes		72,992	141,494	169,620	258,682
Other Segments [Member]
Segment Reporting Information [Line Items]
Net revenues	[1]	(1,218)	(5,242)	2,221	(8,029)
Income/(loss) before income taxes		$ (99,603)	$ (104,774)	$ (194,535)	$ (217,301)

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