Investment In Unconsolidated Affiliate (Condensed Statements of Operations of LSV) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Schedule of Equity Method Investments [Line Items]
Revenues	$ 489,057	$ 481,670	$ 958,176	$ 1,063,113
Equity Method Investment, Nonconsolidated Investee
Schedule of Equity Method Investments [Line Items]
Revenues	108,836	99,814	207,028	208,264
Net income	$ 84,779	$ 77,193	$ 159,553	$ 160,984