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Reinsurance (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Effects of reinsurance on premiums and benefits        
Premiums written and contract deposits, Gross Amount $ 312,351 $ 291,732 $ 838,615 $ 808,147
Premiums written and contract deposits, Ceded to Other Companies 7,162 7,407 22,074 22,175
Premiums written and contract deposits, Assumed from Other Companies 844 881 2,273 2,276
Premiums written and contract deposits, Net Amount 306,033 285,206 818,814 788,248
Premiums and contract charges earned, Gross Amount 179,969 174,372 534,621 519,928
Premiums and contract charges earned, Ceded to Other Companies 7,094 7,410 22,455 22,541
Premiums and contract charges earned, Assumed from Other Companies 886 942 2,314 2,356
Premiums and contract charges earned, Net Amount 173,761 167,904 514,480 499,743
Benefits, claims and settlement expenses, Gross Amount 114,261 108,680 351,274 353,029
Benefits, claims and settlement expenses, Ceded to Other Companies 2,602 3,585 7,251 10,365
Benefits, claims and settlement expenses, Assumed from Other Companies 1,042 956 2,142 2,249
Benefits, claims and settlement expenses, Net Amount $ 112,701 $ 106,051 $ 346,165 $ 344,913