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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
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Mar. 31, 2013 | Mar. 31, 2012
L S V Asset Management [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity Method Investment, Summarized Financial Information, Revenue | $ 80,916 | $ 77,465
Equity Method Investment, Summarized Financial Information, Net Income (Loss) | $ 70,180 | $ 66,673

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