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Investment in Unconsolidated Affiliates (Condensed Balance Sheets of LSV) (Details) - LSV Asset Management - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]
Current assets	$ 138,083	$ 155,239
Non-current assets	1,165	1,407
Total assets	139,248	156,646
Current liabilities	47,874	46,486
Partners’ capital	91,374	110,160
Total liabilities and partners’ capital	$ 139,248	$ 156,646

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