Net Investment (Losses) Gains (Net Investment Gains (Losses)) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Investments, Debt and Equity Securities [Abstract]
Fixed maturity securities, gains	$ 2,632	$ 3,557
Fixed maturity securities, losses	(2,712)	(2,323)
Net realized (losses) gains on investment sales	(2,595)	40,277
Change in unrealized gains	19,947	25,812
Investment funds	14	993
Real estate	3,943	(2,216)
Loans receivable	0	0
Other (2)	(5,518)	(54,597)
Net realized and unrealized gains on investments in earnings before allowance for expected credit losses	15,711	11,503
Fixed maturity securities	318	13,882
Loans receivable	326	395
Change in allowance for expected credit losses on investments	644	14,277
Net investment gains	16,355	25,780
Income tax expense	(3,528)	(6,633)
After-tax net investment gains	$ 12,827	$ 19,147