Segment and Other Operating Information - Balance Sheet Items (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022
Segment Reporting Information [Line Items]
Market risk benefit assets	$ 40,073	$ 48,759	$ 42,358
Total segment assets	12,454,386	12,782,945
Future policyholder obligations	908,212		998,603
Market risk benefits liability	248,876	215,777	219,116
Other policyholder liabilities	3,542,663		$ 3,908,617
Funds withheld liability	1,243,314	1,333,036
Total segment assets
Segment Reporting Information [Line Items]
Deferred transaction costs	929,515	966,008
Market risk benefit assets	40,073	48,759
Total segment assets	11,968,465	12,292,874
Future policyholder obligations	8,345,128	8,710,639
Market risk benefits liability	248,876	215,777
Other policyholder liabilities	148,113	175,089
Funds withheld liability	1,243,314	1,333,036
Total segment assets | Domestic Life Insurance
Segment Reporting Information [Line Items]
Deferred transaction costs	180,049	179,193
Market risk benefit assets	0	0
Total segment assets	1,868,280	1,803,876
Future policyholder obligations	1,574,178	1,553,624
Market risk benefits liability	0	0
Other policyholder liabilities	25,080	25,596
Funds withheld liability	0	0
Total segment assets | International Life Insurance
Segment Reporting Information [Line Items]
Deferred transaction costs	155,665	163,438
Market risk benefit assets	0	0
Total segment assets	869,799	889,022
Future policyholder obligations	643,096	675,786
Market risk benefits liability	0	0
Other policyholder liabilities	12,490	15,560
Funds withheld liability	0	0
Total segment assets | Annuities
Segment Reporting Information [Line Items]
Deferred transaction costs	443,207	470,120
Market risk benefit assets	40,073	48,759
Total segment assets	7,919,330	8,270,315
Future policyholder obligations	5,543,613	5,907,974
Market risk benefits liability	248,876	215,777
Other policyholder liabilities	96,355	118,615
Funds withheld liability	1,243,314	1,333,036
Total segment assets | ONL & Affiliates
Segment Reporting Information [Line Items]
Deferred transaction costs	150,594	153,257
Market risk benefit assets	0	0
Total segment assets	962,050	994,318
Future policyholder obligations	584,241	573,255
Market risk benefits liability	0	0
Other policyholder liabilities	14,188	15,318
Funds withheld liability	0	0
Total segment assets | All Others
Segment Reporting Information [Line Items]
Deferred transaction costs	0	0
Market risk benefit assets	0	0
Total segment assets	349,006	335,343
Future policyholder obligations	0	0
Market risk benefits liability	0	0
Other policyholder liabilities	0	0
Funds withheld liability	$ 0	$ 0