Schedule III - Supplementary Insurance Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Supplementary Insurance Information, by Segment [Line Items]
Deferred policy acquisition costs	$ 3,081,886	$ 2,943,782
Liability for future policy benefits, losses, claims and loss expense reserves	7,390,800	7,138,649
Unearned and advance premiums	15,422	16,437
Policy claims and other benefits payable	538,250	585,382
Separate account liabilities	2,305,717	2,799,992
Premium revenue	1,600,228	1,505,884	$ 1,326,383
Net investment income	93,065	80,588	83,814
Benefits, claims, losses and settlement expense	665,749	722,753	615,569
Amortization of deferred policy acquisition costs	356,143	251,179	224,321
Other operating expense	1,204,492	1,224,629	870,921
Premiums written	602	670	701
Term Life Insurance [Member]
Supplementary Insurance Information, by Segment [Line Items]
Deferred policy acquisition costs	3,008,330	2,859,758
Liability for future policy benefits, losses, claims and loss expense reserves	7,181,525	6,927,789
Unearned and advance premiums	14,992	15,982
Policy claims and other benefits payable	525,877	573,316
Premium revenue	1,585,646	1,490,230	1,309,661
Net investment income	51,160	36,486	27,030
Benefits, claims, losses and settlement expense	649,530	703,897	593,948
Amortization of deferred policy acquisition costs	342,925	241,451	216,208
Other operating expense	246,131	215,719	200,063
Investment and Savings Products [Member]
Supplementary Insurance Information, by Segment [Line Items]
Deferred policy acquisition costs	53,127	62,278
Separate account liabilities	2,305,688	2,799,954
Amortization of deferred policy acquisition costs	12,141	8,668	7,055
Other operating expense	611,961	658,595	509,167
Senior Health [Member]
Supplementary Insurance Information, by Segment [Line Items]
Other operating expense	161,355	145,490
Corporate and Other Distributed Products Segment [Member]
Supplementary Insurance Information, by Segment [Line Items]
Deferred policy acquisition costs	20,429	21,746
Liability for future policy benefits, losses, claims and loss expense reserves	209,275	210,860
Unearned and advance premiums	430	455
Policy claims and other benefits payable	12,373	12,066
Separate account liabilities	29	38
Premium revenue	14,582	15,654	16,722
Net investment income	41,905	44,102	56,784
Benefits, claims, losses and settlement expense	16,219	18,856	21,621
Amortization of deferred policy acquisition costs	1,077	1,060	1,058
Other operating expense	185,045	204,825	161,691
Premiums written	$ 602	$ 670	$ 701