Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 302,994	$ 257,083	$ 815,566	$ 695,953
Unrealized gains (losses) on fixed maturities:
Unrealized holding gains (losses) arising during period	869,743	(1,068,091)	301,715	(932,301)
Other reclassification adjustments included in net income	(2,408)	851	2,580	82,866
Foreign exchange adjustment on fixed maturities recorded at fair value	(954)	1,603	546	603
Total unrealized investment gains (losses)	866,381	(1,065,637)	304,841	(848,832)
Less applicable tax (expense) benefit	(181,941)	223,782	(64,018)	178,250
Unrealized gains (losses) on investments, net of tax	684,440	(841,855)	240,823	(670,582)
Future Policy Benefits:
Change in discount rate on future policy benefits	(1,247,366)	1,687,310	63,614	1,272,631
Less applicable tax (expense) benefit	261,946	(354,334)	(13,360)	(267,252)
Future policy benefit adjustments, net of tax	(985,420)	1,332,976	50,254	1,005,379
Foreign exchange translation:
Foreign exchange translation adjustments, other than securities	7,296	(7,881)	(4,660)	(4,039)
Less applicable tax (expense) benefit	(1,532)	1,655	979	847
Foreign exchange translation adjustments, other than securities, net of tax	5,764	(6,226)	(3,681)	(3,192)
Pension:
Pension adjustments	118	35	354	(336)
Less applicable tax (expense) benefit	(25)	(7)	(74)	70
Pension adjustments, net of tax	93	28	280	(266)
Other comprehensive income (loss)	(295,123)	484,923	287,676	331,339
Comprehensive income (loss)	$ 7,871	$ 742,006	$ 1,103,242	$ 1,027,292