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Investment in Unconsolidated Affiliate (Condensed Balance Sheets Of LSV) (Details) - L S V Asset Management [Member] - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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Schedule of Equity Method Investments [Line Items] |  |
Current assets | $ 136,299 | $ 125,872
Non-current assets | 1,553 | 1,927
Total assets | 137,852 | 127,799
Current liabilities | 71,555 | 39,303
Partners’ capital | 66,297 | 88,496
Total liabilities and partners’ capital | $ 137,852 | $ 127,799

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