Net Investment Gains (Change in Unrealized Gains (Losses) of Available For Sales Securities) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Realized and Unrealized Investment Gains Losses [Line Items]
Total change in unrealized investment (losses) gains	$ (144,043)	$ (430,784)	$ 87,978	$ (970,232)
Income tax benefit (expense)	30,759	93,776	(20,463)	209,679
Noncontrolling interests	0	0	(1)	(1)
Total change in unrealized gains	(113,284)	(337,008)	67,514	(760,554)
Debt securities
Realized and Unrealized Investment Gains Losses [Line Items]
Total change in unrealized investment (losses) gains	(148,021)	(409,647)	79,094	(949,910)
Fixed maturity securities with allowance for expected credit losses
Realized and Unrealized Investment Gains Losses [Line Items]
Total change in unrealized investment (losses) gains	3,694	(16,878)	7,150	(16,585)
Investment funds
Realized and Unrealized Investment Gains Losses [Line Items]
Total change in unrealized investment (losses) gains	462	(3,302)	2,398	(2,833)
Other
Realized and Unrealized Investment Gains Losses [Line Items]
Total change in unrealized investment (losses) gains	$ (178)	$ (957)	$ (664)	$ (904)