Segment Reporting (Schedule Of Operating Information, Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012		Mar. 31, 2011
Net revenues	$ 400,333	[1]	$ 366,613	[1]
Income before income tax expense	59,254		50,684
Global Wealth Management [Member]
Net revenues	248,348	[1]	238,446	[1]
Income before income tax expense	69,178		61,472
Institutional Group [Member]
Net revenues	148,504	[1]	126,994	[1]
Income before income tax expense	23,704		21,393
Other [Member]
Net revenues	3,481	[1]	1,173	[1]
Income before income tax expense	$ (33,628)		$ (32,181)

[1] No individual client accounted for more than 10 percent of total net revenues for the three months ended March 31, 2012 or 2011.