Schedule II. Condensed Financial Information of Registrant (Condensed Statements of Operations) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Condensed Financial Statements, Captions [Line Items]
Net investment income	$ 1,135,631	$ 1,056,884	$ 991,800
Total revenue	5,778,069	5,447,533	5,226,740
General operating expenses	419,143	347,833	353,954
Interest expense	127,092	102,316	90,395
Total benefits and expenses	4,451,432	4,253,267	4,124,629
Income tax benefit (expense)	(255,875)	(223,511)	(207,725)
Net income	1,070,762	970,755	894,386
Other comprehensive income (loss):
Attributable to Parent Company	742,699	17,894	1,444,735
Comprehensive income (loss)	1,813,461	988,649	2,339,121
Parent Company
Condensed Financial Statements, Captions [Line Items]
Net investment income	38,341	36,237	33,664
Realized gains (losses)	4,158	5,924	(9,643)
Total revenue	42,499	42,161	24,021
General operating expenses	75,387	59,051	59,307
Reimbursements from affiliates	(53,136)	(59,796)	(51,312)
Interest expense	125,023	107,180	97,051
Total benefits and expenses	147,274	106,435	105,046
Operating income (loss) before income taxes and equity in earnings of affiliates	(104,775)	(64,274)	(81,025)
Income tax benefit (expense)	19,832	10,706	12,426
Net operating loss before equity in earnings of affiliates	(84,943)	(53,568)	(68,599)
Equity in earnings of affiliates, net of tax	1,155,705	1,024,323	962,985
Net income	1,070,762	970,755	894,386
Other comprehensive income (loss):
Attributable to Parent Company	21,326	1,113	75,076
Attributable to affiliates	721,373	16,781	1,369,659
Comprehensive income (loss)	$ 1,813,461	$ 988,649	$ 2,339,121