Income Taxes - Schedule of Significant Portions of Deferred Tax Assets and Deferred Tax Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Deferred tax assets:
Unrealized losses	$ 532,756	$ 732,750
Carryover of tax losses	10,342	4,227
Total gross deferred tax assets	543,098	736,977
Less valuation allowance	(3,383)	0
Net deferred tax assets	539,715	736,977
Deferred tax liabilities:
Employee and agent compensation	104,385	100,689
Deferred acquisition costs	961,406	892,149
Future policy benefits, unearned and advance premiums, and policy claims	228,117	267,564
Other liabilities	24,432	17,466
Total gross deferred tax liabilities	1,318,340	1,277,868
Net deferred tax liability	$ 778,625	$ 540,891