Deferred Acquisition Costs - Schedule of Deferred Policy Acquisition Costs to Consolidated Balance Sheet (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs	$ 6,386,682		$ 6,009,477	$ 5,889,293
Life
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs	5,607,729	$ 5,495,593	5,271,775	5,163,985	$ 5,065,265	$ 4,844,291
Health
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs	777,162	762,523	734,735	721,931	709,669	686,763
Annuity
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs	1,791			3,377
American Income | Life
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs	2,829,810	2,740,138	2,573,370	2,490,720	2,417,480	2,258,291
American Income | Health
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs	74,399	71,589	66,783	64,346	62,285	57,811
DTC | Life
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs	1,773,417	1,765,673	1,737,117	1,726,209	1,714,715	1,676,931
DTC | Health
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs	1,571	1,608	1,679	1,717	1,760	1,854
Liberty National | Life
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs	712,733	696,905	666,419	651,130	636,209	610,723
Liberty National | Health
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs	146,971	145,097	139,941	137,973	136,276	133,096
Other premium | Life
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs	291,769	292,877	294,869	295,926	296,861	298,346
United American | Health
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs	71,361	71,975	73,489	74,381	75,349	77,394
Family Heritage | Health
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs	$ 482,860	$ 472,254	$ 452,843	$ 443,514	$ 433,999	$ 416,608