Income Taxes - Schedule of Significant Portions of Deferred Tax Assets and Deferred Tax Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Deferred tax assets:
Unrealized losses	$ 460,158	$ 532,756
Carryover of tax losses	15,052	10,342
Total gross deferred tax assets	475,210	543,098
Less valuation allowance	(2,632)	(3,383)
Net deferred tax assets	472,578	539,715
Deferred tax liabilities:
Employee and agent compensation	115,604	104,385
Deferred acquisition costs	961,915	961,406
Future policy benefits, unearned and advance premiums, and policy claims	254,277	228,117
Other liabilities	75,843	24,432
Total gross deferred tax liabilities	1,407,639	1,318,340
Net deferred tax liability	$ 935,061	$ 778,625