Business Segments - Schedule of Segment Premium Income by Distribution Channel (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2023 USD ($)	Sep. 30, 2023 USD ($)	Jun. 30, 2023 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Sep. 30, 2022 USD ($)	Jun. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2023 USD ($) segment	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Segment Reporting [Abstract]
Number of segments | segment									4
Segment Reporting Information [Line Items]
Premium	$ 1,130,672	$ 1,119,335	$ 1,110,920	$ 1,095,090	$ 1,088,949	$ 1,079,282	$ 1,077,199	$ 1,064,812	$ 4,456,017	$ 4,310,242	$ 4,094,813
% of Total									100.00%	100.00%	100.00%
Life
Segment Reporting Information [Line Items]
Premium									$ 3,137,244	$ 3,027,824	$ 2,893,930
% of Total									100.00%	100.00%	100.00%
Health
Segment Reporting Information [Line Items]
Premium									$ 1,318,773	$ 1,282,417	$ 1,200,882
% of Total									100.00%	100.00%	100.00%
Annuity
Segment Reporting Information [Line Items]
Premium									$ 0	$ 1	$ 1
% of Total									0.00%	100.00%	100.00%
American Income
Segment Reporting Information [Line Items]
Premium									$ 1,709,034	$ 1,622,387	$ 1,516,640
% of Total									38.00%	38.00%	37.00%
American Income | Life
Segment Reporting Information [Line Items]
Premium									$ 1,588,702	$ 1,505,034	$ 1,401,898
% of Total									51.00%	50.00%	48.00%
American Income | Health
Segment Reporting Information [Line Items]
Premium									$ 120,332	$ 117,353	$ 114,742
% of Total									9.00%	9.00%	9.00%
American Income | Annuity
Segment Reporting Information [Line Items]
Premium									$ 0	$ 0	$ 0
% of Total									0.00%	0.00%	0.00%
Direct to Consumer
Segment Reporting Information [Line Items]
Premium									$ 1,059,981	$ 1,056,617	$ 1,042,341
% of Total									24.00%	24.00%	25.00%
Direct to Consumer | Life
Segment Reporting Information [Line Items]
Premium									$ 991,406	$ 985,488	$ 968,365
% of Total									32.00%	33.00%	34.00%
Direct to Consumer | Health
Segment Reporting Information [Line Items]
Premium									$ 68,575	$ 71,129	$ 73,976
% of Total									5.00%	5.00%	6.00%
Direct to Consumer | Annuity
Segment Reporting Information [Line Items]
Premium									$ 0	$ 0	$ 0
% of Total									0.00%	0.00%	0.00%
Liberty National
Segment Reporting Information [Line Items]
Premium									$ 537,670	$ 514,710	$ 498,869
% of Total									12.00%	12.00%	12.00%
Liberty National | Life
Segment Reporting Information [Line Items]
Premium									$ 349,736	$ 327,469	$ 311,200
% of Total									11.00%	11.00%	11.00%
Liberty National | Health
Segment Reporting Information [Line Items]
Premium									$ 187,934	$ 187,241	$ 187,669
% of Total									14.00%	15.00%	16.00%
Liberty National | Annuity
Segment Reporting Information [Line Items]
Premium									$ 0	$ 0	$ 0
% of Total									0.00%	0.00%	0.00%
United American
Segment Reporting Information [Line Items]
Premium									$ 553,034	$ 547,841	$ 489,549
% of Total									13.00%	13.00%	12.00%
United American | Life
Segment Reporting Information [Line Items]
Premium									$ 7,311	$ 7,966	$ 8,892
% of Total									0.00%	0.00%	0.00%
United American | Health
Segment Reporting Information [Line Items]
Premium									$ 545,723	$ 539,874	$ 480,656
% of Total									42.00%	42.00%	40.00%
United American | Annuity
Segment Reporting Information [Line Items]
Premium									$ 0	$ 1	$ 1
% of Total									0.00%	100.00%	100.00%
Family Heritage
Segment Reporting Information [Line Items]
Premium									$ 402,343	$ 372,406	$ 348,796
% of Total									9.00%	9.00%	9.00%
Family Heritage | Life
Segment Reporting Information [Line Items]
Premium									$ 6,134	$ 5,586	$ 4,957
% of Total									0.00%	0.00%	0.00%
Family Heritage | Health
Segment Reporting Information [Line Items]
Premium									$ 396,209	$ 366,820	$ 343,839
% of Total									30.00%	29.00%	29.00%
Family Heritage | Annuity
Segment Reporting Information [Line Items]
Premium									$ 0	$ 0	$ 0
% of Total									0.00%	0.00%	0.00%
Other
Segment Reporting Information [Line Items]
Premium									$ 193,955	$ 196,281	$ 198,618
% of Total									4.00%	4.00%	5.00%
Other | Life
Segment Reporting Information [Line Items]
Premium									$ 193,955	$ 196,281	$ 198,618
% of Total									6.00%	6.00%	7.00%
Other | Health
Segment Reporting Information [Line Items]
Premium									$ 0	$ 0	$ 0
% of Total									0.00%	0.00%	0.00%
Other | Annuity
Segment Reporting Information [Line Items]
Premium									$ 0	$ 0	$ 0
% of Total									0.00%	0.00%	0.00%