Consolidated Statement of Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning of period	$ 7,469,237
Other comprehensive (loss) gain	(8,433)	$ 338,745	$ (982,624)
End of period	8,407,439	7,469,237
Unrealized investment gains (losses), before tax	79,738	47,540	217,311
Pre-Tax Income (Loss)	2,264,493	1,754,403	1,719,681
Federal and foreign income taxes	(509,916)	(370,557)	(334,727)
Net income	1,754,577	1,383,846	1,384,954
Unrealized investment gains, before tax	84,474	392,903	(1,248,128)
Currency translation adjustments, before tax	(77,615)	32,192
Other comprehensive income (loss), before tax	6,859	425,095
Unrealized investment gains, tax	(15,292)	(86,350)
Currency translation adjustments, tax	0	0
Other comprehensive income (loss), tax	(15,292)	(86,350)
Unrealized investment gains, net of tax	69,182	306,553
Change in unrealized translation adjustments	(77,615)	32,192	1,179
Unrealized Investment Gains (Losses)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning of period	(586,354)	(892,905)
Other comprehensive income (loss) before reclassifications	(26,128)	252,782
Amounts reclassified from AOCI	95,310	53,771
Other comprehensive (loss) gain	69,182	306,553
Unrealized investment gain related to noncontrolling interest	2	(2)
End of period	(517,170)	(586,354)	(892,905)
Unrealized Investment Gains (Losses) | Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Unrealized investment gains (losses), before tax	120,646	68,065
Federal and foreign income taxes	(25,336)	(14,294)
Net income	95,310	53,771
Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning of period	(339,484)	(371,676)	(372,855)
Other comprehensive income (loss) before reclassifications	(77,615)	32,192
Amounts reclassified from AOCI	0	0
Other comprehensive (loss) gain	(77,615)	32,192
Unrealized investment gain related to noncontrolling interest	0	0
End of period	(417,099)	(339,484)	(371,676)
Change in unrealized translation adjustments	(77,615)	32,192	1,179
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 Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning of period	(925,838)	(1,264,581)
Other comprehensive income (loss) before reclassifications	(103,743)	284,974
Amounts reclassified from AOCI	95,310	53,771
Other comprehensive (loss) gain	(8,433)	338,745
Unrealized investment gain related to noncontrolling interest	2	(2)
End of period	(934,269)	(925,838)	$ (1,264,581)
Accumulated Other Comprehensive Income (Loss) | Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pre-Tax Income (Loss)	120,646	68,065
Federal and foreign income taxes	(25,336)	(14,294)
Net income	$ 95,310	$ 53,771