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Investment in Unconsolidated Affiliates (Condensed Statements of Operations of LSV) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]      
Revenues $ 1,919,793 $ 1,991,037 $ 1,918,309
Equity Method Investment, Nonconsolidated Investee      
Schedule of Equity Method Investments [Line Items]      
Revenues 426,270 406,895 456,259
Net income $ 328,905 $ 312,180 $ 354,964