Consolidated Statements of Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning of period	$ 6,768,161
Other comprehensive income (loss)	185,665	$ (367,273)
End of period	6,965,623
Net realized and unrealized gains on investments	22,611	369,882
Income before income taxes	376,071	732,433
Tax effect	(80,342)	(139,403)
Net income before noncontrolling interests	295,729	593,030
Total change in unrealized investment gains (losses)	232,021	(539,449)
Net change in period	4,866	56,272
Other comprehensive income (loss), pre-tax	236,887	(483,177)
Other comprehensive income (loss), tax effect	(51,222)	115,904
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning of period	(1,264,581)	(281,955)
Other comprehensive income (loss) before reclassifications	160,081	(376,864)
Amounts reclassified from AOCI	25,584	9,591
Other comprehensive income (loss)	185,665	(367,273)
Unrealized investment loss related to noncontrolling interest	(1)	(1)
End of period	(1,078,917)	(649,229)
Accumulated Other Comprehensive Income (Loss) | Amounts reclassified from AOCI
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Income before income taxes	32,385	12,141
Tax effect	(6,801)	(2,550)
Net income before noncontrolling interests	25,584	9,591
Unrealized Investment Gains (Losses)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning of period	(892,905)	90,900
Other comprehensive income (loss) before reclassifications	155,215	(433,136)
Amounts reclassified from AOCI	25,584	9,591
Other comprehensive income (loss)	180,799	(423,545)
Unrealized investment loss related to noncontrolling interest	(1)	(1)
End of period	(712,107)	(332,646)
Total change in unrealized investment gains (losses)	232,021	(539,449)
Unrealized investment gains, tax effect	(51,222)	115,904
Unrealized investment gains (losses), after-tax amounts	180,799	(423,545)
Unrealized Investment Gains (Losses) | Amounts reclassified from AOCI
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Net realized and unrealized gains on investments	32,385	12,141
Tax effect	(6,801)	(2,550)
Net income before noncontrolling interests	25,584	9,591
Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning of period	(371,676)	(372,855)
Other comprehensive income (loss) before reclassifications	4,866	56,272
Amounts reclassified from AOCI	0	0
Other comprehensive income (loss)	4,866	56,272
Unrealized investment loss related to noncontrolling interest	0	0
End of period	(366,810)	(316,583)
Currency translation adjustment, pre-tax	4,866	56,272
Currency translation adjustment, tax effect	0	0
Net change in period	4,866	56,272
Currency Translation Adjustments | Amounts reclassified from AOCI
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Income before income taxes	0	0
Tax effect	0	0
Net income before noncontrolling interests	$ 0	$ 0