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Reinsurance (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Effects of reinsurance on premiums and benefits    
Premiums written and contract deposits, Gross Amount $ 301,512 $ 287,992
Premiums written and contract deposits, Ceded to Other Companies 5,510 5,768
Premiums written and contract deposits, Assumed from Other Companies 730 945
Premiums written and contract deposits, Net Amount 296,732 283,169
Premiums and contract charges earned, Gross Amount 200,455 190,233
Premiums and contract charges earned, Ceded to Other Companies 5,534 5,769
Premiums and contract charges earned, Assumed from Other Companies 801 986
Premiums and contract charges earned, Net Amount 195,722 185,450
Benefits, claims and settlement expenses, Gross Amount 147,271 131,240
Benefits, claims and settlement expenses, Ceded to Other Companies 3,883 12,662
Benefits, claims and settlement expenses, Assumed from Other Companies 708 935
Benefits, claims and settlement expenses, Net Amount $ 144,096 $ 119,513