Segment Operating Results (Reconciliation Of Other Revenue From Segments To Consolidated) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Segment Reporting Information [Line Items]
Total Other Revenue, net	$ (5,494)		$ (636)		$ (2,058)
Investment Banking [Member]
Segment Reporting Information [Line Items]
Total Other Revenue, net	(2,473)	[1]	(84)	[1]	(677)	[1]
Investment Management [Member]
Segment Reporting Information [Line Items]
Total Other Revenue, net	(3,021)	[2]	(552)	[2]	(1,381)	[2]
Senior Notes [Member] | Investment Banking [Member]
Segment Reporting Information [Line Items]
Interest expense on senior notes investment banking	4,238		4,169		2,742
Senior Notes [Member] | Investment Management [Member]
Segment Reporting Information [Line Items]
Interest expense on senior notes investment banking	$ 3,579		$ 3,525		$ 4,853

[1] Investment Banking Other Revenue, net, includes interest expense on the Senior Notes of $4,238, $4,169, and $2,742 for the years ended December 31, 2011, 2010 and 2009, respectively.

[2] Investment Management Other Revenue, net, includes interest expense on the Senior Notes of $3,579, $3,525 and $4,853 for the years ended December 31, 2011, 2010 and 2009, respectively.