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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
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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

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