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Investment in Unconsolidated Affiliate (Balance Sheets) (Details) - LSV Asset Management - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Schedule of Equity Method Investments [Line Items] |  |
Current assets | $ 147,554 | $ 138,083
Non-current assets | 4,777 | 1,165
Total assets | 152,331 | 139,248
Current liabilities | 61,823 | 47,874
Non-current liabilities | 4,881 | 0
Partners’ capital | 85,627 | 91,374
Total liabilities and partners’ capital | $ 152,331 | $ 139,248

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