Segment Reporting (Schedule Of Operating Information, Segment) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 item		Dec. 31, 2012		Dec. 31, 2011
Number of business segments	3
Number of businesses within reportable segment	2
Net revenues	$ 1,973,446	[1]	$ 1,594,113	[1]	$ 1,393,068	[1]
Income before income tax expense	185,229		229,747		138,149
Net revenues accounted for by individual client, maximum percentage	10.00%
Global Wealth Management [Member]
Net revenues	1,117,179	[1]	991,597	[1]	904,967	[1]
Income before income tax expense	299,572		266,669		233,994
Institutional Group [Member]
Net revenues	861,158	[1]	604,654	[1]	487,643	[1]
Income before income tax expense	142,889		101,487		64,315
Other [Member]
Net revenues	(4,891)	[1]	(2,138)	[1]	458	[1]
Income before income tax expense	$ (257,232)		$ (138,409)		$ (160,160)

[1] No individual client accounted for more than 10 percent of total net revenues for the years ended December 31, 2013, 2012, or 2011.