Segment Reporting (Schedule Of Operating Information, Segment) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Segment Reporting Information [Line Items]
Net revenues	[1]	$ 770,420	$ 750,358
Income/(loss) before income taxes		137,809	119,554
Global Wealth Management [Member]
Segment Reporting Information [Line Items]
Net revenues	[1]	510,610	485,575
Income/(loss) before income taxes		194,490	176,771
Institutional Group [Member]
Segment Reporting Information [Line Items]
Net revenues	[1]	261,286	270,078
Income/(loss) before income taxes		32,204	44,570
Other Segments [Member]
Segment Reporting Information [Line Items]
Net revenues	[1]	(1,476)	(5,295)
Income/(loss) before income taxes		$ (88,885)	$ (101,787)

[1] No individual client accounted for more than 10 percent of total net revenues for the three months ended March 31, 2019 or 2018.