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Schedule IV - Reinsurance (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]      
Gross amount, life insurance in force $ 1,942,129 $ 1,996,446 $ 2,036,690
Ceded to other companies, life insurance in force 9,378 10,045 10,677
Assumed from other companies, life insurance in force 57,965 57,849 56,882
Net amount, life insurance in force 1,990,716 2,044,250 2,082,895
Net amount, insurance premiums and other considerations $ 34,228 $ 43,767 $ 36,048
Percent of amount assumed to net, life insurance in force 2.91% 2.83% 2.73%
Insurance Premiums and Other Considerations [Member]      
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]      
Gross amount, insurance premiums and other considerations $ 240,890 $ 222,466 $ 177,310
Ceded to other companies, insurance premiums and other considerations 6,673 5,617 5,683
Assumed from other companies, insurance premiums and other considerations 505 497 589
Net amount, insurance premiums and other considerations $ 234,722 $ 217,346 $ 172,216
Percent of amount assumed to net, insurance premiums and other considerations 0.22% 0.23% 0.34%
Annuity Product Charges [Member]      
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]      
Gross amount, insurance premiums and other considerations $ 206,952 $ 178,945 $ 141,595
Ceded to other companies, insurance premiums and other considerations 6,458 5,366 5,427
Assumed from other companies, insurance premiums and other considerations 0 0 0
Net amount, insurance premiums and other considerations $ 200,494 $ 173,579 $ 136,168
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 [Member]      
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]      
Gross amount, insurance premiums and other considerations $ 33,938 $ 43,521 $ 35,715
Ceded to other companies, insurance premiums and other considerations 215 251 256
Assumed from other companies, insurance premiums and other considerations 505 497 589
Net amount, insurance premiums and other considerations $ 34,228 $ 43,767 $ 36,048
Percent of amount assumed to net, insurance premiums and other considerations 1.48% 1.14% 1.63%