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Investment In Unconsolidated Affiliates (Condensed Statement Of Operations Of LSV) (Details) (L S V Asset Management [Member], USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
L S V Asset Management [Member]
        
Schedule of Equity Method Investments [Line Items]        
Equity Method Investment, Summarized Financial Information, Revenue $ 105,948 $ 83,682 $ 201,721 $ 164,598
Equity Method Investment, Summarized Financial Information, Net Income (Loss) $ 87,820 $ 70,922 $ 169,743 $ 141,102