Schedule IV - Reinsurance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Gross amount, life insurance in force	$ 64,544	$ 1,942,129	$ 1,996,446
Ceded to other companies, life insurance in force	7,832	9,378	10,045
Assumed from other companies, life insurance in force	53,658	57,965	57,849
Net amount, life insurance in force	110,370	1,990,716	2,044,250
Net amount, insurance premiums and other considerations	$ 26,480	$ 34,228	$ 43,767
Percent of amount assumed to net, life insurance in force	48.62%	2.91%	2.83%
Insurance Premiums and Other Considerations
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Gross amount, insurance premiums and other considerations	$ 257,881	$ 240,890	$ 222,466
Ceded to other companies, insurance premiums and other considerations	7,263	6,673	5,617
Assumed from other companies, insurance premiums and other considerations	350	505	497
Net amount, insurance premiums and other considerations	$ 250,968	$ 234,722	$ 217,346
Percent of amount assumed to net, insurance premiums and other considerations	0.14%	0.22%	0.23%
Fixed Index Annuities
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Gross amount, insurance premiums and other considerations	$ 231,562	$ 206,952	$ 178,945
Ceded to other companies, insurance premiums and other considerations	7,074	6,458	5,366
Assumed from other companies, insurance premiums and other considerations	0	0	0
Net amount, insurance premiums and other considerations	$ 224,488	$ 200,494	$ 173,579
Percent of amount assumed to net, insurance premiums and other considerations	0.00%	0.00%	0.00%
Traditional Life, Accident and Health Insurance, and Life Contingent Immediate Annuity Premiums
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Gross amount, insurance premiums and other considerations	$ 26,319	$ 33,938	$ 43,521
Ceded to other companies, insurance premiums and other considerations	189	215	251
Assumed from other companies, insurance premiums and other considerations	350	505	497
Net amount, insurance premiums and other considerations	$ 26,480	$ 34,228	$ 43,767
Percent of amount assumed to net, insurance premiums and other considerations	1.32%	1.48%	1.14%