Schedule II. Condensed Financial Information of Registrant - Condensed Statements of Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Condensed Financial Statements, Captions [Line Items]
Net investment income	$ 1,130,198	$ 1,135,631	$ 1,056,884
Total revenue	5,994,318	5,778,069	5,447,533
General operating expenses	442,368	419,143	347,833
Interest expense	141,221	127,092	102,316
Total benefits and expenses	4,558,343	4,451,432	4,253,267
Income tax benefit (expense)	(274,737)	(255,875)	(223,511)
Net income	1,161,238	1,070,762	970,755
Other comprehensive income (loss):
Attributable to Parent Company	258,276	742,699	17,894
Comprehensive income (loss)	1,419,514	1,813,461	988,649
Parent Company
Condensed Financial Statements, Captions [Line Items]
Net investment income	32,889	38,341	36,237
Realized gains (losses)	5,793	4,158	5,924
Total revenue	38,682	42,499	42,161
General operating expenses	94,021	75,387	59,051
Reimbursements from affiliates	(75,504)	(53,136)	(59,796)
Interest expense	147,673	125,023	107,180
Total benefits and expenses	166,190	147,274	106,435
Operating income (loss) before income taxes and equity in earnings of affiliates	(127,508)	(104,775)	(64,274)
Income tax benefit (expense)	16,005	19,832	10,706
Net operating loss before equity in earnings of affiliates	(111,503)	(84,943)	(53,568)
Equity in earnings of affiliates, net of tax	1,272,741	1,155,705	1,024,323
Net income	1,161,238	1,070,762	970,755
Other comprehensive income (loss):
Attributable to Parent Company	10,539	21,326	1,113
Attributable to affiliates	247,737	721,373	16,781
Comprehensive income (loss)	$ 1,419,514	$ 1,813,461	$ 988,649