Net Investment Gains (Losses) (Change in Unrealized Gains (Losses) of Available For Sales Securities) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Realized and Unrealized Investment Gains Losses [Line Items]
Unrealized investment gains, before tax	$ (1,248,128)	$ (254,939)	$ 164,645
Income tax benefit (expense)	264,325	56,127	(24,395)
Noncontrolling interests	(2)	(2)	(2)
Total change in unrealized gains and losses	(983,805)	(198,814)	140,248
Debt Securities
Realized and Unrealized Investment Gains Losses [Line Items]
Unrealized investment gains, before tax	(1,216,292)	(262,221)	134,129
Fixed maturity securities with allowance for expected credit losses
Realized and Unrealized Investment Gains Losses [Line Items]
Unrealized investment gains, before tax	(28,370)	10,124	32,004
Investment funds
Realized and Unrealized Investment Gains Losses [Line Items]
Unrealized investment gains, before tax	(2,019)	(1,270)	2,280
Other
Realized and Unrealized Investment Gains Losses [Line Items]
Unrealized investment gains, before tax	$ (1,447)	$ (1,572)	$ (3,768)