Net Investment Gains (Losses) (Change in Unrealized Gains (Losses) of Available For Sales Securities) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Realized and Unrealized Investment Gains Losses [Line Items]
Total change in unrealized investment losses	$ (539,449)	$ (113,735)
Income tax benefit	115,904	23,605
Noncontrolling interests	(1)	0
Total change in unrealized gains	(423,546)	(90,130)
Debt securities
Realized and Unrealized Investment Gains Losses [Line Items]
Total change in unrealized investment losses	(540,263)	(122,568)
Fixed maturity securities with allowance for expected credit losses
Realized and Unrealized Investment Gains Losses [Line Items]
Total change in unrealized investment losses	293	10,355
Investment funds
Realized and Unrealized Investment Gains Losses [Line Items]
Total change in unrealized investment losses	469	(1,020)
Other
Realized and Unrealized Investment Gains Losses [Line Items]
Total change in unrealized investment losses	$ 52	$ (502)