Deferred Acquisition Costs - Schedule of Deferred Policy Acquisition Costs to Consolidated Balance Sheet (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs	$ 6,754,821		$ 6,495,589	$ 6,260,294
Life
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs	5,931,048	$ 5,814,820	5,700,755	5,495,593	$ 5,378,825	$ 5,271,775
Life \| American Income
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs	3,078,370	2,986,007	2,900,229	2,740,138	2,652,009	2,573,370
Life \| DTC
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs	1,803,138	1,792,790	1,781,230	1,765,673	1,754,184	1,737,117
Life \| Liberty National
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs	757,696	743,388	728,790	696,905	678,885	666,419
Life \| Other premium
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs	291,844	292,635	290,506	292,877	293,747	294,869
Health
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs	823,082	807,773	793,421	762,523	749,844	734,735
Health \| American Income
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs	81,545	78,833	76,319	71,589	68,938	66,783
Health \| DTC
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs	1,459	1,496	1,533	1,608	1,643	1,679
Health \| Liberty National
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs	152,822	150,977	148,920	145,097	144,313	139,941
Health \| United American
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs	69,073	69,755	70,530	71,975	72,604	73,489
Health \| Family Heritage
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs	518,183	$ 506,712	$ 496,119	472,254	$ 462,346	$ 452,843
Annuity Segment
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs	$ 691			$ 2,178