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Investments (Equity Securities) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Debt and Equity Securities, FV-NI [Line Items]          
Equity securities, at fair value $ 5,336   $ 5,336   $ 5,282
Investment related gains (losses), net (253) $ 703 710 $ 415  
Bond Mutual Funds [Member]          
Debt and Equity Securities, FV-NI [Line Items]          
Equity securities, at fair value 738   738   740
Common Stock          
Debt and Equity Securities, FV-NI [Line Items]          
Equity securities, at fair value 693   693   665
Non-redeemable Preferred Stock [Member]          
Debt and Equity Securities, FV-NI [Line Items]          
Equity securities, at fair value 7   7   7
Nonredeemable Preferred Stock Fund Member [Member]          
Debt and Equity Securities, FV-NI [Line Items]          
Equity securities, at fair value 3,898   3,898   $ 3,870
Equity Securities [Member]          
Debt and Equity Securities, FV-NI [Line Items]          
Investment related gains (losses), net $ (100) $ (200) $ 100 $ 100