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Investment in Unconsolidated Affiliate (Balance Sheets) (Details) - L S V Asset Management [Member] - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]
Current assets	$ 143,922	$ 155,239
Non-current assets	1,444	1,407
Total assets	145,366	156,646
Current liabilities	47,641	46,486
Partners’ capital	97,725	110,160
Total liabilities and partners’ capital	$ 145,366	$ 156,646

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