Net Investment Gains (Losses) (Change in Unrealized Gains (Losses) of Available For Sales Securities) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Realized and Unrealized Investment Gains Losses [Line Items]
Total change in unrealized investment (losses) gains	$ (45,270)	$ 48,980	$ (130,201)	$ 111,756
Income tax benefit (expense)	9,674	(10,707)	27,747	(13,740)
Noncontrolling interests	0	(3)	(1)	(2)
Total change in unrealized gains	(35,596)	38,270	(102,455)	98,014
Debt securities
Realized and Unrealized Investment Gains Losses [Line Items]
Total change in unrealized investment (losses) gains	(41,041)	46,164	(135,099)	89,363
Fixed maturity securities with allowance for expected credit losses
Realized and Unrealized Investment Gains Losses [Line Items]
Total change in unrealized investment (losses) gains	111	5,036	10,397	30,027
Investment funds
Realized and Unrealized Investment Gains Losses [Line Items]
Total change in unrealized investment (losses) gains	(4,098)	(198)	(4,355)	(3,632)
Other
Realized and Unrealized Investment Gains Losses [Line Items]
Total change in unrealized investment (losses) gains	$ (242)	$ (2,022)	$ (1,144)	$ (4,002)