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Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Summarized financial information for these segments          
Insurance premiums and contract charges earned $ 179,138 $ 171,561 $ 354,541 $ 340,719  
Net investment income 81,405 77,361 164,449 154,764  
Net income (loss) 20,452 25,995 48,818 53,007  
Assets 9,446,175   9,446,175   8,826,672
Property and casualty [Member]
          
Summarized financial information for these segments          
Insurance premiums and contract charges earned 144,658 139,457 288,550 277,393  
Net investment income 9,455 9,100 18,740 18,070  
Net income (loss) 4,895 4,166 18,922 14,326  
Assets 1,079,368   1,079,368   1,001,561
Annuity [Member]
          
Summarized financial information for these segments          
Insurance premiums and contract charges earned 6,453 5,747 12,377 10,819  
Net investment income 54,338 51,289 110,195 102,643  
Net income (loss) 11,573 9,230 23,812 20,291  
Assets 6,364,058   6,364,058   5,963,348
Life [Member]
          
Summarized financial information for these segments          
Insurance premiums and contract charges earned 28,027 26,357 53,614 52,507  
Net investment income 17,842 17,210 35,976 34,529  
Net income (loss) 5,015 5,528 8,897 9,868  
Assets 1,882,043   1,882,043   1,743,084
Corporate and other [Member]
          
Summarized financial information for these segments          
Net investment income 2 4 4 4  
Net income (loss) (1,031) 7,071 (2,813) 8,522  
Assets 150,741   150,741   154,557
Intersegment eliminations [Member]
          
Summarized financial information for these segments          
Net investment income (232) (242) (466) (482)  
Assets $ (30,035)   $ (30,035)   $ (35,878)