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Reinsurance (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Effects of reinsurance on premiums and benefits        
Premiums written and contract deposits, Gross Amount $ 291,732 $ 305,476 $ 808,147 $ 823,557
Premiums written and contract deposits, Ceded to Other Companies 7,407 7,484 22,175 23,698
Premiums written and contract deposits, Assumed from Other Companies 881 918 2,276 2,477
Premiums written and contract deposits, Net Amount 285,206 298,910 788,248 802,336
Premiums and contract charges earned, Gross Amount 174,372 173,537 519,928 522,207
Premiums and contract charges earned, Ceded to Other Companies 7,410 7,480 22,541 24,702
Premiums and contract charges earned, Assumed from other Companies 942 978 2,356 2,561
Premiums and contract charges earned, Net Amount 167,904 167,035 499,743 500,066
Benefits, claims and settlement expenses, Gross Amount 108,680 127,524 353,029 413,909
Benefits, claims and settlement expenses, Ceded to Other Companies 3,585 4,278 10,365 17,478
Benefits, claims and settlement expenses, Assumed from Other Companies 956 1,166 2,249 2,391
Benefits, claims and settlement expenses, Net Amount $ 106,051 $ 124,412 $ 344,913 $ 398,822