Income Taxes - Significant Portions of Deferred Tax Assets and Deferred Tax Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Deferred tax assets:
Unrealized losses	$ 373,175	$ 0
Carryover of tax losses	2,470	5,962
Total gross deferred tax assets	375,645	5,962
Deferred tax liabilities:
Unrealized gains	0	713,879
Employee and agent compensation	86,063	93,738
Deferred acquisition costs	764,813	723,337
Future policy benefits, unearned and advance premiums, and policy claims	216,268	226,943
Other liabilities	17,479	15,738
Total gross deferred tax liabilities	1,084,623	1,773,635
Net deferred tax liability	$ 708,978	$ 1,767,673