Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 258,355	$ 215,260	$ 512,572	$ 438,870
Unrealized gains (losses) on fixed maturities:
Unrealized holding gains (losses) arising during period	(263,012)	(333,329)	(568,028)	135,790
Other reclassification adjustments included in net income	7,400	49,425	4,988	82,015
Foreign exchange adjustment on fixed maturities recorded at fair value	(117)	(10,567)	1,500	(1,000)
Total unrealized investment gains (losses)	(255,729)	(294,471)	(561,540)	216,805
Less applicable tax (expense) benefit	53,701	61,836	117,923	(45,532)
Unrealized gains (losses) on investments, net of tax	(202,028)	(232,635)	(443,617)	171,273
Future Policy Benefits:
Change in discount rate on future policy benefits	606,384	306,211	1,310,980	(414,679)
Less applicable tax (expense) benefit	(127,342)	(64,305)	(275,306)	87,082
Future policy benefit adjustments, net of tax	479,042	241,906	1,035,674	(327,597)
Foreign exchange translation:
Foreign exchange translation adjustments, other than securities	641	10,358	(11,956)	3,842
Less applicable tax (expense) benefit	(135)	(2,176)	2,511	(808)
Foreign exchange translation adjustments, other than securities, net of tax	506	8,182	(9,445)	3,034
Pension:
Pension adjustments	118	(323)	236	(371)
Less applicable tax (expense) benefit	(22)	66	(49)	77
Pension adjustments, net of tax	96	(257)	187	(294)
Other comprehensive income (loss)	277,616	17,196	582,799	(153,584)
Comprehensive income (loss)	$ 535,971	$ 232,456	$ 1,095,371	$ 285,286