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Reinsurance (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Effects of reinsurance on premiums and benefits        
Premiums written and contract deposits, Gross Amount $ 356,155 $ 331,223 $ 960,945 $ 966,867
Premiums written and contract deposits, Ceded to Other Companies 5,555 5,952 17,244 18,260
Premiums written and contract deposits, Assumed from Other Companies 934 927 2,881 2,720
Premiums written and contract deposits, Net Amount 351,534 326,198 946,582 951,327
Premiums and contract charges earned, Gross Amount 195,654 187,813 579,283 560,818
Premiums and contract charges earned, Ceded to Other Companies 5,584 5,961 17,305 18,608
Premiums and contract charges earned, Assumed from Other Companies 980 960 2,882 2,717
Premiums and contract charges earned, Net Amount 191,050 182,812 564,860 544,927
Benefits, claims and settlement expenses, Gross Amount 139,114 123,061 422,352 378,939
Benefits, claims and settlement expenses, Ceded to Other Companies 4,642 3,034 21,748 13,397
Benefits, claims and settlement expenses, Assumed from Other Companies 1,238 1,154 3,027 2,597
Benefits, claims and settlement expenses, Net Amount $ 135,710 $ 121,181 $ 403,631 $ 368,139