Consolidated Statement of Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning of period	$ 6,667,730
Other comprehensive (loss) gain	(982,624)	$ (219,781)	$ 170,177
End of period	6,768,161	6,667,730
Unrealized investment gains (losses), before tax	217,311	106,958	73,514
Pre-Tax Income (Loss)	1,719,681	1,282,905	704,802
Federal and foreign income taxes	(334,727)	(251,890)	(171,817)
Net income	1,384,954	1,031,015	532,985
Unrealized investment gains, before tax	(1,248,128)	(254,939)	164,645
Currency translation adjustments, before tax	1,179	(20,969)
Other comprehensive income (loss), before tax	(1,246,949)	(275,908)
Unrealized investment gains, tax	264,325	56,127
Currency translation adjustments, tax	0	0
Other comprehensive income (loss), tax	264,325	56,127
Unrealized investment gains, net of tax	(983,803)	(198,812)
Change in unrealized translation adjustments	1,179	(20,969)	29,927
Unrealized Investment (Losses) Gains
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning of period	90,900	289,714
Other comprehensive (loss) income before reclassifications	(1,054,838)	(222,359)
Amounts reclassified from AOCI	71,035	23,547
Other comprehensive (loss) gain	(983,803)	(198,812)
Unrealized investment loss related to noncontrolling interest	(2)	(2)
End of period	(892,905)	90,900	289,714
Unrealized Investment (Losses) Gains | Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Unrealized investment gains (losses), before tax	89,918	29,806
Federal and foreign income taxes	(18,883)	(6,259)
Net income	71,035	23,547
Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning of period	(372,855)	(351,886)	(381,813)
Other comprehensive (loss) income before reclassifications	1,179	(20,969)
Amounts reclassified from AOCI	0	0
Other comprehensive (loss) gain	1,179	(20,969)
Unrealized investment loss related to noncontrolling interest	0	0
End of period	(371,676)	(372,855)	(351,886)
Change in unrealized translation adjustments	1,179	(20,969)	29,927
Currency Translation Adjustments | Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pre-Tax Income (Loss)	0	0
Federal and foreign income taxes	0	0
Net income	0	0
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning of period	(281,955)	(62,172)
Other comprehensive (loss) income before reclassifications	(1,053,659)	(243,328)
Amounts reclassified from AOCI	71,035	23,547
Other comprehensive (loss) gain	(982,624)	(219,781)
Unrealized investment loss related to noncontrolling interest	(2)	(2)
End of period	(1,264,581)	(281,955)	$ (62,172)
Accumulated Other Comprehensive Loss | Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pre-Tax Income (Loss)	89,918	29,806
Federal and foreign income taxes	(18,883)	(6,259)
Net income	$ 71,035	$ 23,547