Net Investment Gains (Losses) (Net Investment Gains (Losses)) (Details) - USD ($) $ in Thousands	1 Months Ended		12 Months Ended
	Jun. 30, 2023	Mar. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]
Fixed maturity securities, Gains			$ 2,003	$ 4,224	$ 18,981
Fixed maturity securities, losses			(25,429)	(11,654)	(6,975)
Net realized gains (losses) on investment sales (2)			161,271	(12,879)	16,365
Change in unrealized gains (losses)			70,448	(632)	(38,455)
Investment funds			(25,625)	12,407	44,778
Real estate (3) (4)			(70,934)	293,525	94,911
Loans receivable			(18,841)	(32)	(881)
Other			(45,353)	(67,648)	(21,766)
Net realized and unrealized gains on investments in earnings before allowance for expected credit losses			47,540	217,311	106,958
Fixed maturity securities			715	(14,841)	(20,045)
Loans receivable			(1,213)	(73)	3,719
Change in allowance for expected credit losses on investments			(498)	(14,914)	(16,326)
Net investment gains			47,042	202,397	90,632
Income tax expense			(10,250)	(42,670)	(17,710)
After-tax net investment gains				$ 159,727	$ 72,922
Gain on Sale of Investments	$ 89,000
Impairment of real estate			$ 72,000
Gains (losses) ion sale of investment real estate		$ 251,000