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Investment in Unconsolidated Affiliate (Balance Sheets) (Details) - LSV Asset Management - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]
Current assets	$ 153,014	$ 155,239
Non-current assets	1,520	1,407
Total assets	154,534	156,646
Current liabilities	63,594	46,486
Partners’ capital	90,940	110,160
Total liabilities and partners’ capital	$ 154,534	$ 156,646

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