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Investment In Unconsolidated Affiliate (Statement of Operations) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Schedule of Equity Method Investments [Line Items]
Revenues	$ 485,322	$ 424,927	$ 1,416,659	$ 1,240,335
Equity Method Investment, Nonconsolidated Investee | LSV Asset Management
Schedule of Equity Method Investments [Line Items]
Revenues	115,728	94,902	342,957	289,546
Net income	$ 90,365	$ 70,440	$ 266,805	$ 220,184

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