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Investment in Unconsolidated Affiliate (Balance Sheets) (Details) - LSV Asset Management - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Schedule of Equity Method Investments [Line Items] |  |
Current assets | $ 150,183 | $ 155,239
Non-current assets | 1,383 | 1,407
Total assets | 151,566 | 156,646
Current liabilities | 79,052 | 46,486
Partners’ capital | 72,514 | 110,160
Total liabilities and partners’ capital | $ 151,566 | $ 156,646

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