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Segment Reporting (Schedule Of Operating Information, Segment) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
item
Jun. 30, 2013
Number of business segments     3  
Number of businesses within reportable segment     2  
Net revenues $ 560,147 [1] $ 493,678 [1] $ 1,106,893 [1] $ 932,282 [1]
Income before income tax expense 77,523 52,575 155,651 76,233
Net revenues accounted for by individual client, maximum percentage     10.00%  
Global Wealth Management [Member]
       
Net revenues 307,247 [1] 282,717 [1] 604,430 [1] 549,674 [1]
Income before income tax expense 89,098 78,924 168,774 148,423
Institutional Group [Member]
       
Net revenues 255,712 [1] 215,444 [1] 505,689 [1] 388,744 [1]
Income before income tax expense 42,690 31,083 88,312 59,313
Other [Member]
       
Net revenues (2,812) [1] (4,483) [1] (3,226) [1] (6,136) [1]
Income before income tax expense $ (54,265) $ (57,432) $ (101,435) $ (131,503)
[1] No individual client accounted for more than 10 percent of total net revenues for the three and six months ended June 30, 2014 or 2013.