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Investment in Unconsolidated Affiliates (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Schedule of Equity Method Investments [Line Items] |  |  |
Company's share in the earnings of LSV | $ 126,930 | $ 120,667 | $ 137,572
Distributions received from LSV | $ 121,582 | 120,849 | 131,170
LSV Asset Management |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership interest in LSV | 38.60% |  |
Total investment in LSV | $ 110,781 |  |
Company's share in the earnings of LSV | 126,930 | 120,667 | 137,572
Distributions received from LSV | $ 121,582 | $ 120,849 | $ 131,170

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