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Investments - Narrative (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Schedule of Investments [Line Items]
Investments—Affiliates and Other	$ 80,640	$ 76,524
Investments - consolidated investment companies	83,366	108,448
Stocks of Large Companies
Schedule of Investments [Line Items]
Investments - consolidated investment companies	18,600	45,300
Debt Securities
Schedule of Investments [Line Items]
Investments - consolidated investment companies	57,700	57,800
Mutual Fund
Schedule of Investments [Line Items]
Investments - consolidated investment companies	3,500	2,100
Stocks of Small and Mid Sized Companies
Schedule of Investments [Line Items]
Investments - consolidated investment companies	3,500	3,300
Federated Hermes Funds
Schedule of Investments [Line Items]
Investments—Affiliates and Other	73,500	67,000
Separate Accounts
Schedule of Investments [Line Items]
Investments—Affiliates and Other	7,100	9,500
Separate Accounts | Stocks of Large Companies
Schedule of Investments [Line Items]
Investments—Affiliates and Other	3,100	3,400
Separate Accounts | Debt Securities
Schedule of Investments [Line Items]
Investments—Affiliates and Other	$ 2,500	$ 4,600

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