Significant Accounting Policies - Schedule of Deferred Policy Acquisition Costs to Consolidated Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Jan. 01, 2021	Dec. 31, 2020
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs	$ 6,009,477	$ 5,535,697	$ 5,067,539	$ 4,587,547
Revision of Prior Period, Error Correction, Adjustment
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs					$ 4,581,591
Life
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs	5,271,775	4,844,291	4,412,015	3,983,021	3,983,021
Life | Revision of Prior Period, Error Correction, Adjustment
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs					3,982,159
Health
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs	734,735	686,763	649,082	596,217	612,718
Health | Revision of Prior Period, Error Correction, Adjustment
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs					596,216
Annuity
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs	2,967	4,643	6,442	8,309
Annuity | Revision of Prior Period, Error Correction, Adjustment
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs					3,216
American Income | Life
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs	2,573,370	2,258,291	1,960,254	1,647,761	1,647,760
American Income | Life | Revision of Prior Period, Error Correction, Adjustment
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs					1,647,761
American Income | Health
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs	66,783	57,811	49,406	39,477	39,477
American Income | Health | Revision of Prior Period, Error Correction, Adjustment
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs					39,477
Direct to Consumer | Life
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs	1,737,117	1,676,931	1,583,695	1,498,970	1,498,971
Direct to Consumer | Life | Revision of Prior Period, Error Correction, Adjustment
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs					1,498,435
Direct to Consumer | Health
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs	1,679	1,854	2,032	2,215	2,216
Direct to Consumer | Health | Revision of Prior Period, Error Correction, Adjustment
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs					6,520
Liberty National | Life
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs	666,419	610,723	566,419	531,504	531,504
Liberty National | Life | Revision of Prior Period, Error Correction, Adjustment
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs					531,504
Liberty National | Health
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs	139,941	133,096	127,537	124,754	124,754
Liberty National | Health | Revision of Prior Period, Error Correction, Adjustment
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs					124,888
Other premium | Life
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs	294,869	298,346	301,647	304,786	304,786
Other premium | Life | Revision of Prior Period, Error Correction, Adjustment
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs					304,459
United American | Health
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs	73,489	77,394	81,140	65,020	81,520
United American | Health | Revision of Prior Period, Error Correction, Adjustment
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs					60,580
Family Heritage | Health
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs	$ 452,843	$ 416,608	$ 388,967	$ 364,751	364,751
Family Heritage | Health | Revision of Prior Period, Error Correction, Adjustment
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs					$ 364,751