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, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Realized and Unrealized Investment Gains Losses [Line Items]
Total change in unrealized investment gains (losses)	$ 157,858	$ (20,640)	$ 343,713	$ (109,937)
Income tax (expense) benefit	(37,593)	7,302	(75,175)	26,477
Noncontrolling interests	0	1	(1)	1
Total change in unrealized gains	120,265	(13,337)	268,537	(83,459)
Debt securities
Realized and Unrealized Investment Gains Losses [Line Items]
Total change in unrealized investment gains (losses)	152,235	(11,394)	336,222	(99,988)
Fixed maturity securities with allowance for expected credit losses
Realized and Unrealized Investment Gains Losses [Line Items]
Total change in unrealized investment gains (losses)	478	(7,683)	(73)	(6,696)
Investment funds
Realized and Unrealized Investment Gains Losses [Line Items]
Total change in unrealized investment gains (losses)	5,110	(1,338)	7,606	(3,041)
Other
Realized and Unrealized Investment Gains Losses [Line Items]
Total change in unrealized investment gains (losses)	$ 35	$ (225)	$ (42)	$ (212)