Investment In Unconsolidated Affiliates Investment In Unconsolidated Affiliates (Condensed Statements of Operations of LSV) (Details) (LSV Asset Management [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
LSV Asset Management [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Summarized Financial Information, Revenue	$ 296,261	$ 296,397	$ 273,381
Equity Method Investment, Summarized Financial Information, Net Income (Loss)	$ 250,165	$ 257,519	$ 239,981