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Schedule IV - Reinsurance (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]      
Gross amount, life insurance in force $ 1,996,446 $ 2,036,690 $ 2,171,426
Ceded to other companies, life insurance in force 10,045 10,677 11,548
Assumed from other companies, life insurance in force 57,849 56,882 56,509
Net amount, life insurance in force 2,044,250 2,082,895 2,216,387
Net amount, insurance premiums and other considerations $ 43,767 $ 36,048 $ 32,623
Percent of amount assumed to net, life insurance in force 2.83% 2.73% 2.55%
Insurance Premiums and Other Considerations [Member]      
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]      
Gross amount, insurance premiums and other considerations $ 222,466 $ 177,310 $ 157,254
Ceded to other companies, insurance premiums and other considerations 5,617 5,683 6,292
Assumed from other companies, insurance premiums and other considerations 497 589 651
Net amount, insurance premiums and other considerations $ 217,346 $ 172,216 $ 151,613
Percent of amount assumed to net, insurance premiums and other considerations 0.23% 0.34% 0.43%
Annuity Product Charges [Member]      
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]      
Gross amount, insurance premiums and other considerations $ 178,945 $ 141,595 $ 124,946
Ceded to other companies, insurance premiums and other considerations 5,366 5,427 5,956
Assumed from other companies, insurance premiums and other considerations 0 0 0
Net amount, insurance premiums and other considerations $ 173,579 $ 136,168 $ 118,990
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 $ 43,521 $ 35,715 $ 32,308
Ceded to other companies, insurance premiums and other considerations 251 256 336
Assumed from other companies, insurance premiums and other considerations 497 589 651
Net amount, insurance premiums and other considerations $ 43,767 $ 36,048 $ 32,623
Percent of amount assumed to net, insurance premiums and other considerations 1.14% 1.63% 2.00%