Business Segments - Segment Premium Income by Distribution Channel and Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) segment	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Segment Reporting [Abstract]
Number of segments | segment	4
Segment Reporting Information [Line Items]
Revenue	$ 4,302,709	$ 4,099,887	$ 3,813,905
% of Total	100.00%	100.00%	100.00%
Life
Segment Reporting Information [Line Items]
Revenue	$ 3,023,296	$ 2,898,210	$ 2,672,804
% of Total	100.00%	100.00%	100.00%
Health
Segment Reporting Information [Line Items]
Revenue	$ 1,279,412	$ 1,201,676	$ 1,141,097
% of Total	100.00%	100.00%	100.00%
Annuity
Segment Reporting Information [Line Items]
Revenue	$ 1	$ 1	$ 4
% of Total	100.00%	100.00%	100.00%
American Income
Segment Reporting Information [Line Items]
Revenue	$ 1,622,733	$ 1,517,828	$ 1,363,460
% of Total	38.00%	37.00%	36.00%
American Income | Life
Segment Reporting Information [Line Items]
Revenue	$ 1,505,425	$ 1,402,878	$ 1,257,726
% of Total	50.00%	48.00%	47.00%
American Income | Health
Segment Reporting Information [Line Items]
Revenue	$ 117,308	$ 114,950	$ 105,734
% of Total	9.00%	9.00%	9.00%
American Income | Annuity
Segment Reporting Information [Line Items]
Revenue	$ 0	$ 0	$ 0
% of Total	0.00%	0.00%	0.00%
Direct to Consumer
Segment Reporting Information [Line Items]
Revenue	$ 1,052,612	$ 1,045,407	$ 983,486
% of Total	24.00%	25.00%	26.00%
Direct to Consumer | Life
Segment Reporting Information [Line Items]
Revenue	$ 981,517	$ 971,461	$ 906,959
% of Total	32.00%	34.00%	34.00%
Direct to Consumer | Health
Segment Reporting Information [Line Items]
Revenue	$ 71,095	$ 73,946	$ 76,527
% of Total	6.00%	6.00%	7.00%
Direct to Consumer | Annuity
Segment Reporting Information [Line Items]
Revenue	$ 0	$ 0	$ 0
% of Total	0.00%	0.00%	0.00%
Liberty National
Segment Reporting Information [Line Items]
Revenue	$ 512,403	$ 498,408	$ 482,732
% of Total	12.00%	12.00%	13.00%
Liberty National | Life
Segment Reporting Information [Line Items]
Revenue	$ 326,642	$ 311,081	$ 293,897
% of Total	11.00%	11.00%	11.00%
Liberty National | Health
Segment Reporting Information [Line Items]
Revenue	$ 185,761	$ 187,327	$ 188,835
% of Total	14.00%	16.00%	16.00%
Liberty National | Annuity
Segment Reporting Information [Line Items]
Revenue	$ 0	$ 0	$ 0
% of Total	0.00%	0.00%	0.00%
United American
Segment Reporting Information [Line Items]
Revenue	$ 546,342	$ 490,437	$ 462,672
% of Total	13.00%	12.00%	12.00%
United American | Life
Segment Reporting Information [Line Items]
Revenue	$ 7,913	$ 8,822	$ 9,688
% of Total	0.00%	0.00%	0.00%
United American | Health
Segment Reporting Information [Line Items]
Revenue	$ 538,428	$ 481,614	$ 452,980
% of Total	42.00%	40.00%	40.00%
United American | Annuity
Segment Reporting Information [Line Items]
Revenue	$ 1	$ 1	$ 4
% of Total	100.00%	100.00%	100.00%
Family Heritage
Segment Reporting Information [Line Items]
Revenue	$ 372,407	$ 348,796	$ 321,274
% of Total	9.00%	9.00%	8.00%
Family Heritage | Life
Segment Reporting Information [Line Items]
Revenue	$ 5,587	$ 4,957	$ 4,253
% of Total	0.00%	0.00%	0.00%
Family Heritage | Health
Segment Reporting Information [Line Items]
Revenue	$ 366,820	$ 343,839	$ 317,021
% of Total	29.00%	29.00%	28.00%
Family Heritage | Annuity
Segment Reporting Information [Line Items]
Revenue	$ 0	$ 0	$ 0
% of Total	0.00%	0.00%	0.00%
Other
Segment Reporting Information [Line Items]
Revenue	$ 196,212	$ 199,011	$ 200,281
% of Total	4.00%	5.00%	5.00%
Other | Life
Segment Reporting Information [Line Items]
Revenue	$ 196,212	$ 199,011	$ 200,281
% of Total	7.00%	7.00%	8.00%
Other | Health
Segment Reporting Information [Line Items]
Revenue	$ 0	$ 0	$ 0
% of Total	0.00%	0.00%	0.00%
Other | Annuity
Segment Reporting Information [Line Items]
Revenue	$ 0	$ 0	$ 0
% of Total	0.00%	0.00%	0.00%