Policy Liabilities - Schedule of Liability For Future Policy Benefits To Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024	Sep. 30, 2024
At Original Discount Rates
Deferred profit liability	$ 184,563		$ 177,108
Deferred annuity	595,506		680,849
Interest sensitive life	714,012		725,857
Other	8,870		8,983
Total future policy benefits	17,933,726		17,402,917
At Current Discount Rates
Deferred profit liability	184,563		177,108
Deferred annuity	595,506		680,849
Interest sensitive life	714,012		725,857
Other	8,868		8,980
Net liability for future policy benefits—long duration health	19,301,965	$ 18,457,263	19,814,913
Life
At Original Discount Rates
Net liability for future policy benefits—long duration life	13,842,435		13,293,880
At Current Discount Rates
Net liability for future policy benefits—long duration health	15,334,987		15,744,284
Net liability for future policy benefits—long duration health	15,334,987		15,744,284
Life | American Income
At Original Discount Rates
Net liability for future policy benefits—long duration life	5,091,655		4,781,464
At Current Discount Rates
Net liability for future policy benefits—long duration health	5,592,465		5,667,941
Net liability for future policy benefits—long duration health	5,592,465		5,667,941
Life | Direct to Consumer
At Original Discount Rates
Net liability for future policy benefits—long duration life	3,251,154		3,106,582
At Current Discount Rates
Net liability for future policy benefits—long duration health	3,687,291		3,767,409
Net liability for future policy benefits—long duration health	3,687,291		3,767,409
Life | Liberty National
At Original Discount Rates
Net liability for future policy benefits—long duration life	2,287,776		2,277,415
At Current Discount Rates
Net liability for future policy benefits—long duration health	2,383,656		2,498,275
Net liability for future policy benefits—long duration health	2,383,656		2,498,275
Life | Other premium
At Original Discount Rates
Net liability for future policy benefits—long duration life	3,211,850		3,128,419
At Current Discount Rates
Net liability for future policy benefits—long duration health	3,671,575		3,810,659
Net liability for future policy benefits—long duration health	3,671,575		3,810,659
Health
At Original Discount Rates
Net liability for future policy benefits—long duration life	2,588,340		2,516,240
At Current Discount Rates
Net liability for future policy benefits—long duration health	2,464,029		2,477,835
Net liability for future policy benefits—long duration health	2,464,029		2,477,835
Health | American Income
At Original Discount Rates
Net liability for future policy benefits—long duration life	134,125		124,534
At Current Discount Rates
Net liability for future policy benefits—long duration health	146,377		140,681
Net liability for future policy benefits—long duration health	146,377		140,681
Health | Direct to Consumer
At Original Discount Rates
Net liability for future policy benefits—long duration life	669		877
At Current Discount Rates
Net liability for future policy benefits—long duration health	696		911
Net liability for future policy benefits—long duration health	696		911
Health | Liberty National
At Original Discount Rates
Net liability for future policy benefits—long duration life	450,490		466,474
At Current Discount Rates
Net liability for future policy benefits—long duration health	477,579		508,632
Net liability for future policy benefits—long duration health	477,579		508,632
Health | United American
At Original Discount Rates
Net liability for future policy benefits—long duration life	84,212		110,384
At Current Discount Rates
Net liability for future policy benefits—long duration health	84,322		114,081
Net liability for future policy benefits—long duration health	84,322		114,081
Health | Family Heritage
At Original Discount Rates
Net liability for future policy benefits—long duration life	1,918,844		1,813,971
At Current Discount Rates
Net liability for future policy benefits—long duration health	1,755,055		1,713,530
Net liability for future policy benefits—long duration health	$ 1,755,055		$ 1,713,530