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Investment in Unconsolidated Affiliate (Balance Sheets) (Details) - LSV Asset Management - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]
Current assets	$ 148,489	$ 138,083
Non-current assets	5,047	1,165
Total assets	153,536	139,248
Current liabilities	47,557	47,874
Non-current liabilities	5,019	0
Partners’ capital	100,960	91,374
Total liabilities and partners’ capital	$ 153,536	$ 139,248

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