Net Investment Gains (Losses) (Net Investment Gains (Losses)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Fixed maturity securities, Gains	$ 4,224	$ 18,981	$ 27,819
Fixed maturity securities, losses	(11,654)	(6,975)	(56,096)
Net realized (losses) gains on investment sales	(12,879)	16,365	32,647
Change in unrealized losses	(632)	(38,455)	(25,868)
Investment funds	12,407	44,778	31,481
Real estate (2)	293,525	94,911	101,554
Loans receivable	(32)	(881)	0
Other	(67,648)	(21,766)	(38,023)
Net realized and unrealized gains on investments in earnings before allowance for expected credit losses	217,311	106,958	73,514
Fixed maturity securities	(14,841)	(20,045)	33,134
Loans receivable	(73)	3,719	(3,648)
Change in allowance for expected credit losses on investments	(14,914)	(16,326)	29,486
Net investment gains	202,397	90,632	103,000
Income tax expense	$ (42,670)	(17,710)	(21,630)
After-tax net investment gains		$ 72,922	$ 81,370