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Segment Information (Details 1) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Additional significant financial information for these segments      
Policy acquisition expenses amortized $ 79,519 $ 83,398 $ 77,347
Income tax expense (benefit) 45,307 24,412 30,037
Property and casualty [Member]
      
Additional significant financial information for these segments      
Policy acquisition expenses amortized 63,768 61,374 60,866
Income tax expense (benefit) 10,849 (5,183) 4,291
Annuity [Member]
      
Additional significant financial information for these segments      
Policy acquisition expenses amortized 6,868 12,334 7,026
Income tax expense (benefit) 19,046 13,499 12,580
Life [Member]
      
Additional significant financial information for these segments      
Policy acquisition expenses amortized 8,883 9,690 9,455
Income tax expense (benefit) 12,305 11,366 10,986
Corporate and other [Member]
      
Additional significant financial information for these segments      
Income tax expense (benefit) $ 3,107 $ 4,730 $ 2,180