Net Investment (Losses) Gains (Change in Unrealized Gains (Losses) of Available For Sales Securities) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Realized and Unrealized Investment Gains Losses [Line Items]
Total change in unrealized investment (losses) gains	$ (59,817)	$ 157,858	$ (245,788)	$ 343,713
Income tax benefit (expense)	12,048	(37,593)	53,063	(75,175)
Noncontrolling interests	0	0	0	(1)
Total change in unrealized gains	(47,769)	120,265	(192,725)	268,537
Debt securities
Realized and Unrealized Investment Gains Losses [Line Items]
Total change in unrealized investment (losses) gains	(59,093)	152,235	(242,571)	336,222
Fixed maturity securities with allowance for expected credit losses
Realized and Unrealized Investment Gains Losses [Line Items]
Total change in unrealized investment (losses) gains	(1)	478	(3)	(73)
Investment funds
Realized and Unrealized Investment Gains Losses [Line Items]
Total change in unrealized investment (losses) gains	(680)	5,110	(3,199)	7,606
Other
Realized and Unrealized Investment Gains Losses [Line Items]
Total change in unrealized investment (losses) gains	$ (43)	$ 35	$ (15)	$ (42)