Policy Liabilities - Schedule of Liability For Future Policy Benefits To Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Jan. 01, 2021
At Original Discount Rates
Deferred profit liability	$ 173,520		$ 176,296
Deferred annuity	813,275		991,687
Interest sensitive life	735,025		740,513
Other	9,400		9,503
Total future policy benefits	16,757,558	$ 16,306,870	16,138,874
At Current Discount Rates
Deferred profit liability	173,520		176,296
Deferred annuity	813,275		991,687
Interest sensitive life	735,025		740,513
Other	9,405		9,504
Net liability for future policy benefits, after other adjustments, at current discount rates	17,218,098	$ 18,040,042	17,585,172
Life
At Original Discount Rates
Net liability for future policy benefits—long duration life	12,626,672		11,906,692
At Current Discount Rates
Net liability for future policy benefits—long duration health	13,383,098		13,542,376
Net liability for future policy benefits, after other adjustments, at current discount rates	13,383,098		13,542,376	$ 19,987,227
Health
At Original Discount Rates
Net liability for future policy benefits—long duration life	2,399,666		2,314,183
At Current Discount Rates
Net liability for future policy benefits—long duration health	2,103,775		2,124,796
Net liability for future policy benefits, after other adjustments, at current discount rates	2,103,775		2,124,796	2,998,631
American Income | Life
At Original Discount Rates
Net liability for future policy benefits—long duration life	4,435,901		4,070,359
At Current Discount Rates
Net liability for future policy benefits—long duration health	4,672,099		4,666,831
Net liability for future policy benefits, after other adjustments, at current discount rates	4,672,099		4,666,831	6,875,917
American Income | Health
At Original Discount Rates
Net liability for future policy benefits—long duration life	113,340		109,217
At Current Discount Rates
Net liability for future policy benefits—long duration health	117,888		119,287
Net liability for future policy benefits, after other adjustments, at current discount rates	117,888		119,287	162,364
Direct to Consumer | Life
At Original Discount Rates
Net liability for future policy benefits—long duration life	2,943,544		2,750,122
At Current Discount Rates
Net liability for future policy benefits—long duration health	3,207,251		3,211,122
Net liability for future policy benefits, after other adjustments, at current discount rates	3,207,251		3,211,122	4,704,555
Direct to Consumer | Health
At Original Discount Rates
Net liability for future policy benefits—long duration life	752		1,024
At Current Discount Rates
Net liability for future policy benefits—long duration health	764		1,060
Net liability for future policy benefits, after other adjustments, at current discount rates	764		1,060	1,598
Liberty National | Life
At Original Discount Rates
Net liability for future policy benefits—long duration life	2,236,374		2,186,063
At Current Discount Rates
Net liability for future policy benefits—long duration health	2,215,114		2,284,613
Net liability for future policy benefits, after other adjustments, at current discount rates	2,215,114		2,284,613	3,372,114
Liberty National | Health
At Original Discount Rates
Net liability for future policy benefits—long duration life	478,078		495,628
At Current Discount Rates
Net liability for future policy benefits—long duration health	482,368		518,983
Net liability for future policy benefits, after other adjustments, at current discount rates	482,368		518,983	740,628
Other | Life
At Original Discount Rates
Net liability for future policy benefits—long duration life	3,010,853		2,900,148
At Current Discount Rates
Net liability for future policy benefits—long duration health	3,288,634		3,379,810
Net liability for future policy benefits, after other adjustments, at current discount rates	3,288,634		3,379,810
United American | Health
At Original Discount Rates
Net liability for future policy benefits—long duration life	126,105		137,231
At Current Discount Rates
Net liability for future policy benefits—long duration health	120,802		135,542
Net liability for future policy benefits, after other adjustments, at current discount rates	120,802		135,542	213,663
Family Heritage | Health
At Original Discount Rates
Net liability for future policy benefits—long duration life	1,681,391		1,571,083
At Current Discount Rates
Net liability for future policy benefits—long duration health	1,381,953		1,349,924
Net liability for future policy benefits, after other adjustments, at current discount rates	$ 1,381,953		$ 1,349,924	$ 1,880,378