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Investment in Unconsolidated Affiliate (Balance Sheets) (Details) - LSV Asset Management - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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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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