Income Taxes - Schedule of Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Deferred tax assets:
Future policy benefit reserves and unpaid policy claims	$ 492,138	$ 368,283
Net operating loss and interest carryforwards	19,219	28,675
Investments	41,590	59,085
Future deductible liabilities	21,791	23,217
Foreign tax credits	26,637	36,424
Other	31,437	23,809
Total deferred tax assets before valuation allowance	632,812	539,493
Valuation allowance	(26,724)	(36,511)
Total deferred tax assets after valuation allowance	606,088	502,982
Deferred tax liabilities:
Deferred policy acquisition costs	(441,730)	(408,582)
Renewal commissions receivable	(50,911)	(53,874)
Intangibles	(45,734)	(47,806)
Reinsurance deposit asset	(39,349)	(47,118)
Other	(24,348)	(19,112)
Total deferred tax liabilities	(602,072)	(576,492)
Net deferred tax assets	$ 4,016
Net deferred tax liabilities		$ (73,510)