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, 2014	Dec. 31, 2013	Dec. 31, 2012
LSV Asset Management [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Summarized Financial Information, Revenue	$ 422,064	$ 354,094	$ 296,261
Equity Method Investment, Summarized Financial Information, Net Income (Loss)	$ 356,824	$ 302,316	$ 250,165