Consolidated Statements of Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning of period			$ 6,667,730
Other comprehensive loss	$ (356,180)	$ (68,418)	(1,103,854)	$ (128,689)
End of period	6,369,976		6,369,976
Net realized and unrealized (losses) gains on investments	(66,282)	17,187	139,664	89,407
Income before income taxes	286,265	332,281	1,241,260	928,289
Tax effect	(55,791)	(64,963)	(238,290)	(191,577)
Net income before noncontrolling interests	230,474	267,318	1,002,970	736,712
Total change in unrealized investment losses	(394,832)	(45,270)	(1,365,064)	(130,201)
Net change in period	(40,516)	(32,822)	(27,637)	(26,235)
Other comprehensive income (loss), pre-tax	(435,348)	(78,092)	(1,392,701)	(156,436)
Other comprehensive income (loss), tax effect	79,168	9,674	288,847	27,747
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning of period	(1,029,630)	(122,444)	(281,955)	(62,172)
Other comprehensive income (loss) before reclassifications	(375,550)	(69,071)	(1,162,294)	(146,930)
Amounts reclassified from AOCI	19,370	653	58,440	18,241
Other comprehensive loss	(356,180)	(68,418)	(1,103,854)	(128,689)
Unrealized investment loss related to noncontrolling interest	0	0	(1)	(1)
End of period	(1,385,810)	(190,862)	(1,385,810)	(190,862)
Accumulated Other Comprehensive Income (Loss) | Amounts reclassified from AOCI
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Income before income taxes	24,519	827	73,975	23,091
Tax effect	(5,149)	(174)	(15,535)	(4,850)
Net income before noncontrolling interests	19,370	653	58,440	18,241
Unrealized Investment Gains (Losses)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning of period	(669,654)	222,855	90,900	289,714
Other comprehensive income (loss) before reclassifications	(335,034)	(36,249)	(1,134,657)	(120,695)
Amounts reclassified from AOCI	19,370	653	58,440	18,241
Other comprehensive loss	(315,664)	(35,596)	(1,076,217)	(102,454)
Unrealized investment loss related to noncontrolling interest	0	0	(1)	(1)
End of period	(985,318)	187,259	(985,318)	187,259
Total change in unrealized investment losses	(394,832)	(45,270)	(1,365,064)	(130,201)
Unrealized investment gains, tax effect	79,168	9,674	288,847	27,747
Unrealized investment gains (losses), after-tax amounts	(315,664)	(35,596)	(1,076,217)	(102,454)
Unrealized Investment Gains (Losses) | Amounts reclassified from AOCI
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Net realized and unrealized (losses) gains on investments	24,519	827	73,975	23,091
Tax effect	(5,149)	(174)	(15,535)	(4,850)
Net income before noncontrolling interests	19,370	653	58,440	18,241
Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning of period	(359,976)	(345,299)	(372,855)	(351,886)
Other comprehensive income (loss) before reclassifications	(40,516)	(32,822)	(27,637)	(26,235)
Amounts reclassified from AOCI	0	0	0	0
Other comprehensive loss	(40,516)	(32,822)	(27,637)	(26,235)
Unrealized investment loss related to noncontrolling interest	0	0	0	0
End of period	(400,492)	(378,121)	(400,492)	(378,121)
Currency translation adjustment, pre-tax	(40,516)	(32,822)	(27,637)	(26,235)
Currency translation adjustment, tax effect	0	0	0	0
Net change in period	(40,516)	(32,822)	(27,637)	(26,235)
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