Investments (Major Categories of Net Investment Gains (Losses) on Investments) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Gain (Loss) on Securities [Line Items]
Gain on equity securities	$ 2,931	$ 5,453
Gain on investments	3,144	6,046
Unrealized (losses) gains on equity securities	(8,434)	4,176
Investment gains, net	(5,290)	10,222
Other Investments [Member]
Gain (Loss) on Securities [Line Items]
Gain on equity securities	0	0
U.S. Treasury securities and obligations of U.S. Government [Member]
Gain (Loss) on Securities [Line Items]
Gain (loss) on debt securities	(24)	0
Corporate bonds [Member]
Gain (Loss) on Securities [Line Items]
Gain (loss) on debt securities	183	494
Corporate bank loans [Member]
Gain (Loss) on Securities [Line Items]
Gain (loss) on debt securities	68	124
Municipal bonds [Member]
Gain (Loss) on Securities [Line Items]
Gain (loss) on debt securities	(14)	(25)
Mortgage-backed [Member]
Gain (Loss) on Securities [Line Items]
Gain (loss) on debt securities	$ 0	$ 0