Net Investment Gains (Losses) (Net Investment Gains (Losses)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]
Fixed maturity securities, Gains	$ 18,981	$ 27,819	$ 23,900
Fixed maturity securities, losses	(6,975)	(56,096)	(13,636)
Net realized gains on investment sales	16,365	32,647	23,306
Change in unrealized (losses) gains	(38,455)	(25,868)	85,292
Investment funds	44,778	31,481	(2,825)
Real estate	94,911	101,554	5,965
Loans receivable	(881)	0	(970)
Other	(21,766)	(38,023)	(329)
Net realized and unrealized gains on investments in earnings before allowance for expected credit losses	106,958	73,514	120,703
Fixed maturity securities	(20,045)	33,134	0
Loans receivable	3,719	(3,648)	0
Change in allowance for expected credit losses on investments	(16,326)	29,486	0
Net investment gains	90,632	103,000	120,703
Income tax expense	$ (17,710)	(21,630)	(25,348)
After-tax net investment gains		$ 81,370	$ 95,355