Investments (Net Realized Investment Gains (Losses)) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Investments, Debt and Equity Securities [Abstract]
Impairment losses	$ 0	$ (582,000)	$ 0	$ (2,399,000)
Portion of impairment losses recognized in other comprehensive income before taxes:	0	237,000	0	891,000
Net impairment losses recognized in earnings	0	(345,000)	0	(1,508,000)
Gross realized gains, available-for-sale fixed maturities	6,021,000	4,518,000	10,315,000	6,945,000
Gross realized (losses), available-for-sale fixed maturities	(352,000)	(467,000)	(539,000)	(1,870,000)
Net realized gains (losses), trading fixed maturities	(8,000)	49,000	64,000	152,000
Net realized gains (losses), equity investments	2,001,000	(4,633,000)	6,190,000	10,558,000
Net realized gains (losses), other investments	1,297,000	1,864,000	4,493,000	1,912,000
Change in unrealized holding gains (losses), trading fixed maturities	(226,000)	382,000	(440,000)	264,000
Change in unrealized holding gains (losses), equity investments	1,700,000	14,699,000	(1,237,000)	(23,778,000)
Change in unrealized holding gains (losses), convertible securities, carried at fair value	529,000	3,913,000	339,000	(1,360,000)
Other	(129,000)	5,000	497,000	(3,000)
Total net realized investment gains (losses)	$ 10,833,000	$ 19,985,000	$ 19,682,000	$ (8,688,000)