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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

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