Investments (Major Categories of Net Investment Gains (Losses) on Investments) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Gain (Loss) on Securities [Line Items]
Gain on equity securities	$ (153)		$ 460	$ 1,141
(Loss) Gain on investments	6	$ 504	(724)	1,667
Unrealized gains (losses) on equity securities	138	(3,325)	476	(8,431)
Investment gains (losses), net	144	(2,821)	(248)	(6,764)
U.S. Treasury securities and obligations of U.S. Government [Member]
Gain (Loss) on Securities [Line Items]
Gain (loss) on debt securities		300	(22)	300
Corporate bonds [Member]
Gain (Loss) on Securities [Line Items]
Gain (loss) on debt securities	(13)	160	(1,175)	172
Corporate bank loans [Member]
Gain (Loss) on Securities [Line Items]
Gain (loss) on debt securities	4	39	(151)	66
Municipal bonds [Member]
Gain (Loss) on Securities [Line Items]
Gain (loss) on debt securities	$ 168	(4)	$ 164	$ (12)
Mortgage-backed [Member]
Gain (Loss) on Securities [Line Items]
Gain (loss) on debt securities		$ 9