Segment Reporting (Schedule Of Operating Information, Segment) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting Information [Line Items]
Net revenues	[1]	$ 821,572	$ 738,342	$ 2,392,779	$ 2,231,432
Income/(loss) before income taxes		150,754	140,530	436,545	378,431
Global Wealth Management [Member]
Segment Reporting Information [Line Items]
Net revenues	[1]	534,571	498,161	1,577,614	1,481,063
Income/(loss) before income taxes		202,823	183,377	589,665	548,043
Institutional Group [Member]
Segment Reporting Information [Line Items]
Net revenues	[1]	290,222	245,952	822,110	768,855
Income/(loss) before income taxes		48,623	34,305	120,129	114,899
Other Segments [Member]
Segment Reporting Information [Line Items]
Net revenues	[1]	(3,221)	(5,771)	(6,945)	(18,486)
Income/(loss) before income taxes		$ (100,692)	$ (77,152)	$ (273,249)	$ (284,511)

[1] No individual client accounted for more than 10 percent of total net revenues for the three and nine months ended September 30, 2019 or 2018.