Net Investment Gains (Losses) (Net Investment Gains (Losses)) (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Mar. 31, 2022	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract]
Fixed maturity securities, gains		$ 1,053	$ 2,943	$ 3,405	$ 16,623
Fixed maturity securities, losses		(2,309)	(1,124)	(8,752)	(5,431)
Net realized gains on investment sales		0	2	946	14,830
Change in unrealized losses		(50,384)	(19,244)	(88,701)	(61,818)
Investment funds		(1,717)	2,526	(6,241)	49,897
Real estate (2)		9,026	33,364	295,576	95,765
Loans receivable		0	0	(32)	(881)
Other		(21,951)	(1,280)	(56,537)	(19,578)
Net realized and unrealized (losses) gains on investments in earnings before allowance for expected credit losses		(66,282)	17,187	139,664	89,407
Fixed maturity securities		(1,311)	2,081	(12,091)	(14,703)
Loans receivable		183	233	(274)	3,700
Change in allowance for expected credit losses on investments		(1,128)	2,314	(12,365)	(11,003)
Net investment (losses) gains		(67,410)	19,501	127,299	78,404
Income tax benefit (expense)		14,456	(4,266)	(26,466)	(15,417)
After-tax net investment (losses) gains		$ (52,954)	$ 15,235	$ 100,833	$ 62,987
Realized gain on sale of real estate investment	$ 251,000