Investments (Equity Securities) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Debt and Equity Securities, FV-NI [Line Items]
Equity securities, at fair value	$ 5,419		$ 5,282
Investment related gains (losses), net	963	$ (288)
Bond Mutual Funds [Member]
Debt and Equity Securities, FV-NI [Line Items]
Equity securities, at fair value	739		740
Common Stock
Debt and Equity Securities, FV-NI [Line Items]
Equity securities, at fair value	664		665
Non-redeemable Preferred Stock [Member]
Debt and Equity Securities, FV-NI [Line Items]
Equity securities, at fair value	7		7
Nonredeemable Preferred Stock Fund Member [Member]
Debt and Equity Securities, FV-NI [Line Items]
Equity securities, at fair value	4,009		$ 3,870
Equity Securities [Member]
Debt and Equity Securities, FV-NI [Line Items]
Investment related gains (losses), net	$ 100	$ 300