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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
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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