Net Investment (Losses) Gains (Net Investment Gains (Losses)) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Investments, Debt and Equity Securities [Abstract]
Fixed maturity securities, gains	$ 4,799	$ 299	$ 11,448	$ 1,357
Fixed maturity securities, losses	(3,884)	(2,700)	(11,569)	(24,470)
Net realized gains on investment sales (2)	407	23,631	102,205	135,763
Change in unrealized (losses) gains	(1,537)	(19,059)	(42,442)	45,605
Investment funds	(101)	(3,329)	1,109	(3,417)
Real estate (3)	1,470	(24,234)	(2,704)	(68,944)
Loans receivable	0	(1,428)	0	(1,428)
Other (4)	(24,516)	(14,035)	(130,212)	(34,063)
Net realized and unrealized (losses) gains on investments in earnings before allowance for expected credit losses	(23,362)	(40,855)	(72,165)	50,403
Fixed maturity securities	14,888	(2,112)	29,768	(8,946)
Loans receivable	388	541	1,579	(2,218)
Change in allowance for expected credit losses on investments	15,276	(1,571)	31,347	(11,164)
Net investment (losses) gains	(8,086)	(42,426)	(40,818)	39,239
Income tax benefit (expense)	$ 43	9,405	$ 5,810	(8,033)
After-tax net investment (losses) gains		$ (33,021)		$ 31,206