Deferred Acquisition Costs - Schedule of Deferred Policy Acquisition Costs to Consolidated Balance Sheet (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs	$ 6,623,644	$ 6,495,589	$ 6,131,237
Life
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs	5,814,820	5,700,755	5,378,825	$ 5,271,775
Life | American Income
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs	2,986,007	2,900,229	2,652,009	2,573,370
Life | DTC
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs	1,792,790	1,781,230	1,754,184	1,737,117
Life | Liberty National
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs	743,388	728,790	678,885	666,419
Life | Other premium
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs	292,635	290,506	293,747	294,869
Health
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs	807,773	793,421	749,844	734,735
Health | American Income
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs	78,833	76,319	68,938	66,783
Health | DTC
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs	1,496	1,533	1,643	1,679
Health | Liberty National
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs	150,977	148,920	144,313	139,941
Health | United American
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs	69,755	70,530	72,604	73,489
Health | Family Heritage
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs	506,712	$ 496,119	462,346	$ 452,843
Annuity Segment
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs	$ 1,051		$ 2,568