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Investment In Unconsolidated Affiliates (Condensed Statements of Operations of LSV) (Details) - LSV Asset Management [Member] - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Schedule of Equity Method Investments [Line Items] |  |  |
Revenues | $ 399,462 | $ 427,653 | $ 422,064
Net income | $ 323,381 | $ 352,845 | $ 356,824

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