Deferred Acquisition Costs - Schedule of Deferred Policy Acquisition Costs to Consolidated Balance Sheet (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Mar. 31, 2026	Dec. 31, 2025	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs	$ 7,230,169		$ 6,999,136	$ 6,754,821
Life
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs	6,351,529	$ 6,253,845	6,147,750	5,931,048	$ 5,814,820	$ 5,700,755
Life \| American Income
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs	3,402,808	3,329,644	3,248,907	3,078,370	2,986,007	2,900,229
Life \| DTC
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs	1,837,987	1,830,728	1,818,120	1,803,138	1,792,790	1,781,230
Life \| Liberty National
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs	822,821	804,800	790,987	757,696	743,388	728,790
Life \| Other
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs	287,913	288,673	289,736	291,844	292,635	290,506
Health
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs	878,640	865,275	851,386	823,082	807,773	793,421
Health \| United American
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs	67,028	67,488	67,952	69,073	69,755	70,530
Health \| Family Heritage
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs	568,538	555,779	543,379	518,183	506,712	496,119
Health \| American Income
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs	90,868	88,822	86,446	81,545	78,833	76,319
Health \| DTC
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs	1,343	1,371	1,399	1,459	1,496	1,533
Health \| Liberty National
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs	150,863	$ 151,815	$ 152,210	152,822	$ 150,977	$ 148,920
Annuity
Deferred Policy Acquisition Cost [Line Items]
Deferred acquisition costs	$ 0			$ 691