Segment Reporting (Schedule Of Operating Information, Segment) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Net revenues	[1]	$ 675,531	$ 619,974
Income/(loss) before income taxes		79,019	43,913
Global Wealth Management [Member]
Segment Reporting Information [Line Items]
Net revenues	[1]	442,732	379,805
Income/(loss) before income taxes		142,052	93,335
Institutional Group [Member]
Segment Reporting Information [Line Items]
Net revenues	[1]	237,467	241,276
Income/(loss) before income taxes		39,872	29,194
Other [Member]
Segment Reporting Information [Line Items]
Net revenues	[1]	(4,668)	(1,107)
Income/(loss) before income taxes		$ (102,905)	$ (78,616)

[1] No individual client accounted for more than 10 percent of total net revenues for the three months ended March 31, 2017 or 2016.