Net Investment (Losses) Gains (Net Investment Gains (Losses)) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Investments, Debt and Equity Securities [Abstract]
Fixed maturity securities, gains	$ 3,557	$ 943
Fixed maturity securities, losses	(2,323)	(18,130)
Net realized gains on investment sales	40,277	1,060
Change in unrealized gains	25,812	43,404
Investment funds	993	10
Real estate	(2,216)	10,739
Loans receivable	0	0
Other (2)	(54,597)	(15,415)
Net realized and unrealized gains on investments in earnings before allowance for expected credit losses	11,503	22,611
Fixed maturity securities	13,882	217
Loans receivable	395	182
Change in allowance for expected credit losses on investments	14,277	399
Net investment gains	25,780	23,010
Income tax expense	(6,633)	(4,850)
After-tax net investment gains	$ 19,147	$ 18,160