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Investment In Unconsolidated Affiliate (Statement of Operations) (Details) - LSV Asset Management - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Schedule of Equity Method Investments [Line Items] |  |  |  |
Revenues | $ 121,232 | $ 133,921 | $ 365,164 | $ 397,750
Net income | $ 96,699 | $ 107,284 | $ 289,918 | $ 317,295

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