Investments (Major Categories of Net Investment Gains (Losses) on Investments) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Gain (Loss) on Securities [Line Items]
Gain on equity securities	$ (11)	$ 1,011	$ 613	$ 1,140
(Loss) Gain on investments	(120)	1,017	(730)	1,163
Unrealized gains (losses) on equity securities	368	(5,011)	338	(5,106)
Investment gains (losses), net	248	(3,994)	(392)	(3,943)
U.S. Treasury securities and obligations of U.S. Government [Member]
Gain (Loss) on Securities [Line Items]
Gain (loss) on debt securities			(22)
Corporate bonds [Member]
Gain (Loss) on Securities [Line Items]
Gain (loss) on debt securities	(45)	1	(1,162)	13
Corporate bank loans [Member]
Gain (Loss) on Securities [Line Items]
Gain (loss) on debt securities	$ (64)	21	(155)	26
Municipal bonds [Member]
Gain (Loss) on Securities [Line Items]
Gain (loss) on debt securities		(7)	$ (4)	(7)
Mortgage-backed [Member]
Gain (Loss) on Securities [Line Items]
Gain (loss) on debt securities		$ (9)		$ (9)