Consolidated Statements of Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning of period			$ 6,768,161
Other comprehensive (loss) income	$ (102,756)	$ (380,401)	82,909	$ (747,674)
End of period	6,908,352		6,908,352
Net realized and unrealized gains (losses) on investments	68,647	(163,935)	91,258	205,947
Income before income taxes	457,184	222,562	833,256	954,995
Tax effect	(101,460)	(43,095)	(181,803)	(182,499)
Net income before noncontrolling interests	355,724	179,467	651,453	772,496
Total change in unrealized investment (losses) gains	(144,043)	(430,784)	87,978	(970,232)
Net change in period	10,528	(43,393)	15,394	12,879
Other comprehensive income (loss), pre-tax	(133,515)	(474,177)	103,372	(957,353)
Other comprehensive income (loss), tax effect	30,759	93,776	(20,463)	209,679
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning of period	(1,078,917)	(649,229)	(1,264,581)	(281,955)
Other comprehensive income (loss) before reclassifications	(45,594)	(409,881)	114,487	(786,744)
Amounts reclassified from AOCI	(57,162)	29,480	(31,578)	39,070
Other comprehensive (loss) income	(102,756)	(380,401)	82,909	(747,674)
Unrealized investment loss related to noncontrolling interest	0	0	(1)	(1)
End of period	(1,181,673)	(1,029,630)	(1,181,673)	(1,029,630)
Accumulated Other Comprehensive Income (Loss) | Amounts reclassified from AOCI
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Income before income taxes	(72,357)	37,316	(39,972)	49,456
Tax effect	15,195	(7,836)	8,394	(10,386)
Net income before noncontrolling interests	(57,162)	29,480	(31,578)	39,070
Unrealized Investment Gains (Losses)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning of period	(712,107)	(332,646)	(892,905)	90,900
Other comprehensive income (loss) before reclassifications	(56,122)	(366,488)	99,093	(799,623)
Amounts reclassified from AOCI	(57,162)	29,480	(31,578)	39,070
Other comprehensive (loss) income	(113,284)	(337,008)	67,515	(760,553)
Unrealized investment loss related to noncontrolling interest	0	0	(1)	(1)
End of period	(825,391)	(669,654)	(825,391)	(669,654)
Total change in unrealized investment (losses) gains	(144,043)	(430,784)	87,978	(970,232)
Unrealized investment gains, tax effect	30,759	93,776	(20,463)	209,679
Unrealized investment gains (losses), after-tax amounts	(113,284)	(337,008)	67,515	(760,553)
Unrealized Investment Gains (Losses) | Amounts reclassified from AOCI
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Net realized and unrealized gains (losses) on investments	(72,357)	37,316	(39,972)	49,456
Tax effect	15,195	(7,836)	8,394	(10,386)
Net income before noncontrolling interests	(57,162)	29,480	(31,578)	39,070
Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning of period	(366,810)	(316,583)	(371,676)	(372,855)
Other comprehensive income (loss) before reclassifications	10,528	(43,393)	15,394	12,879
Amounts reclassified from AOCI	0	0	0	0
Other comprehensive (loss) income	10,528	(43,393)	15,394	12,879
Unrealized investment loss related to noncontrolling interest	0	0	0	0
End of period	(356,282)	(359,976)	(356,282)	(359,976)
Currency translation adjustment, pre-tax	10,528	(43,393)	15,394	12,879
Currency translation adjustment, tax effect	0	0	0	0
Net change in period	10,528	(43,393)	15,394	12,879
Currency Translation Adjustments | Amounts reclassified from AOCI
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Income before income taxes	0	0	0	0
Tax effect	0	0	0	0
Net income before noncontrolling interests	$ 0	$ 0	$ 0	$ 0