Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 254,217	$ 223,610
Unrealized gains (losses) on fixed maturities:
Unrealized holding gains (losses) arising during period	(305,016)	469,119
Other reclassification adjustments included in net income	(2,412)	32,590
Foreign exchange adjustment on fixed maturities recorded at fair value	1,617	9,567
Total unrealized investment gains (losses)	(305,811)	511,276
Less applicable tax (expense) benefit	64,222	(107,368)
Unrealized gains (losses) on investments, net of tax	(241,589)	403,908
Future Policy Benefits:
Change in discount rate on future policy benefits	704,596	(720,890)
Less applicable tax (expense) benefit	(147,964)	151,387
Future policy benefit adjustments, net of tax	556,632	(569,503)
Foreign exchange translation:
Foreign exchange translation adjustments, other than securities	(12,597)	(6,516)
Less applicable tax (expense) benefit	2,646	1,368
Foreign exchange translation adjustments, other than securities, net of tax	(9,951)	(5,148)
Pension:
Pension adjustments	118	(48)
Less applicable tax (expense) benefit	(27)	11
Pension adjustments, net of tax	91	(37)
Other comprehensive income (loss)	305,183	(170,780)
Comprehensive income (loss)	$ 559,400	$ 52,830