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Investment In Unconsolidated Affiliate (Condensed Statements of Operations of LSV) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Schedule of Equity Method Investments [Line Items]        
Revenues $ 476,759 $ 471,334 $ 1,434,935 $ 1,534,447
Equity Method Investment, Nonconsolidated Investee        
Schedule of Equity Method Investments [Line Items]        
Revenues 102,183 91,588 309,211 299,852
Net income $ 77,566 $ 69,013 $ 237,119 $ 229,997