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Investments (Equity Securities) (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Debt and Equity Securities, FV-NI [Line Items] |  |
Equity securities, at fair value | $ 5,716 | $ 5,282
Bond Mutual Funds [Member] |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Equity securities, at fair value | 766 | 740
Common Stock |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Equity securities, at fair value | 774 | 665
Non-redeemable Preferred Stock [Member] |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Equity securities, at fair value | 8 | 7
Nonredeemable Preferred Stock Fund Member [Member] |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Equity securities, at fair value | $ 4,168 | $ 3,870

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