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Segment Information (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
Dec. 31, 2011
Summarized financial information for these segments          
Insurance premiums and contract charges earned $ 167,904 $ 167,035 $ 499,743 $ 500,066  
Net investment income 76,649 71,550 228,658 213,708  
Net income (loss) 32,266 23,637 72,040 37,593  
Assets 8,122,176   8,122,176   7,435,169
Property and casualty [Member]
          
Summarized financial information for these segments          
Insurance premiums and contract charges earned 136,809 136,636 407,471 410,456  
Net investment income 9,022 8,927 27,250 27,402  
Net income (loss) 13,529 1,706 22,633 (11,540)  
Assets 1,023,188   1,023,188   957,266
Annuity [Member]
          
Summarized financial information for these segments          
Insurance premiums and contract charges earned 5,551 4,936 16,053 14,443  
Net investment income 50,742 45,582 150,000 135,029  
Net income (loss) 9,918 4,776 29,380 20,544  
Assets 5,451,688   5,451,688   4,926,204
Life [Member]
          
Summarized financial information for these segments          
Insurance premiums and contract charges earned 25,544 25,463 76,219 75,167  
Net investment income 17,131 17,294 52,148 52,040  
Net income (loss) 4,941 3,671 16,236 13,719  
Assets 1,554,969   1,554,969   1,459,919
Corporate and other [Member]
          
Summarized financial information for these segments          
Net investment income    (1) 1 (2)  
Net income (loss) 3,878 13,484 3,791 14,870  
Assets 127,456   127,456   115,367
Intersegment eliminations [Member]
          
Summarized financial information for these segments          
Net investment income (246) (252) (741) (761)  
Assets $ (35,125)   $ (35,125)   $ (23,587)