Net Investment Gains (Losses) (Net Investment Gains (Losses)) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Investments, Debt and Equity Securities [Abstract]
Fixed maturity securities, gains	$ 647	$ 5,440	$ 2,352	$ 13,680
Fixed maturity securities, losses	(3,459)	(2,236)	(6,443)	(4,307)
Net realized gains on investment sales	41	6,256	946	14,828
Change in unrealized losses	(131,530)	(18,239)	(38,317)	(42,574)
Investment funds	(2,362)	(300)	(4,524)	47,371
Real estate (2)	358	49,492	286,550	62,401
Loans receivable	0	(881)	(32)	(881)
Other	(27,630)	(19,071)	(34,585)	(18,299)
Net realized and unrealized (losses) gains on investments in earnings before allowance for expected credit losses	(163,935)	20,461	205,947	72,219
Fixed maturity securities	(6,874)	1,375	(10,780)	(16,783)
Loans receivable	(746)	2,228	(457)	3,467
Change in allowance for expected credit losses on investments	(7,620)	3,603	(11,237)	(13,316)
Net investment (losses) gains	(171,555)	24,064	194,710	58,903
Income tax benefit (expense)	37,519	(5,264)	(40,923)	(11,151)
After-tax net investment (losses) gains	$ (134,036)	$ 18,800	$ 153,787	$ 47,752