Net Investment (Losses) Gains (Net Investment Gains (Losses)) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Investments, Debt and Equity Securities [Abstract]
Fixed maturity securities, gains	$ 4,209	$ 3,092	$ 6,841	$ 6,649
Fixed maturity securities, losses	(5,654)	(5,362)	(8,366)	(7,685)
Net realized (losses) gains on investment sales	(1,100)	61,521	(3,695)	101,798
Change in unrealized gains (losses)	63,630	(66,717)	83,577	(40,905)
Investment funds	808	217	822	1,210
Real estate	(5,256)	(1,958)	(1,313)	(4,174)
Other (2)	(26,104)	(51,099)	(31,622)	(105,696)
Net realized and unrealized gains (losses) on investments in earnings before allowance for expected credit losses	30,533	(60,306)	46,244	(48,803)
Fixed maturity securities	21	998	339	14,879
Loans receivable	419	796	745	1,191
Change in allowance for expected credit losses on investments	440	1,794	1,084	16,070
Net investment gains (losses)	30,973	(58,512)	47,328	(32,733)
Income tax (expense) benefit	(6,685)	12,401	(10,213)	5,769
After-tax net investment gains (losses)	$ 24,288	$ (46,111)	$ 37,115	$ (26,964)