Net Investment Gains (Net Investment Gains (Losses)) (Details) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended		6 Months Ended
	Jun. 30, 2023	Mar. 31, 2022	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Investments, Debt and Equity Securities [Abstract]
Fixed maturity securities, gains			$ 115	$ 647	$ 1,058	$ 2,352
Fixed maturity securities, losses			(3,640)	(3,459)	(21,770)	(6,443)
Net realized gains on investment sales (2)			111,072	41	112,132	946
Change in unrealized gains (losses)			21,260	(131,530)	64,664	(38,317)
Investment funds			(98)	(2,362)	(88)	(4,524)
Real estate (3) (4)			(55,449)	358	(44,710)	286,550
Loans receivable			0	0	0	(32)
Other			(4,613)	(27,630)	(20,028)	(34,585)
Net realized and unrealized gains (losses) on investments in earnings before allowance for expected credit losses			68,647	(163,935)	91,258	205,947
Fixed maturity securities			(7,052)	(6,874)	(6,835)	(10,780)
Loans receivable			(2,941)	(746)	(2,759)	(457)
Change in allowance for expected credit losses on investments			(9,993)	(7,620)	(9,594)	(11,237)
Net investment gains (losses)			58,654	(171,555)	81,664	194,710
Income tax (expense) benefit			(12,587)	37,519	(17,437)	(40,923)
After-tax net investment gains (losses)			46,067	$ (134,036)	$ 64,227	$ 153,787
Realized gain on sale of real estate investment		$ 251,000
Gain on sale of investment	$ 88,000
Real estate impairment			$ 51,000