Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Statement of Comprehensive Income [Abstract]
Net income	$ 254,563	$ 254,217
Unrealized gains (losses) on fixed maturities:
Unrealized holding gains (losses) arising during period	215,128	(305,016)
Other reclassification adjustments included in net income	(3,341)	(2,412)
Foreign exchange adjustment on fixed maturities recorded at fair value	(430)	1,617
Total unrealized investment gains (losses)	211,357	(305,811)
Less applicable tax (expense) benefit	(44,387)	64,222
Unrealized gains (losses) on investments, net of tax	166,970	(241,589)
Future Policy Benefits:
Change in discount rate on future policy benefits	(139,352)	704,596
Less applicable tax (expense) benefit	29,263	(147,964)
Future policy benefit adjustments, net of tax	(110,089)	556,632
Foreign exchange translation:
Foreign exchange translation adjustments, other than securities	2,421	(12,597)
Less applicable tax (expense) benefit	(508)	2,646
Foreign exchange translation adjustments, other than securities, net of tax	1,913	(9,951)
Pension:
Pension adjustments	68	118
Less applicable tax (expense) benefit	(15)	(27)
Pension adjustments, net of tax	53	91
Other comprehensive income (loss)	58,847	305,183
Comprehensive income (loss)	$ 313,410	$ 559,400