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Segment Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Summarized financial information for these segments          
Insurance premiums and contract charges earned $ 188,360 $ 182,376 $ 373,810 $ 362,115  
Net investment income 91,179 83,995 175,838 167,308  
Net income (loss) 11,866 16,183 37,019 50,458  
Assets 10,466,302   10,466,302   $ 10,056,972
Intersegment Eliminations [Member]          
Summarized financial information for these segments          
Net investment income (215) (223) (432) (449)  
Assets (31,520)   (31,520)   (37,208)
Property and casualty [Member]          
Summarized financial information for these segments          
Insurance premiums and contract charges earned 153,673 147,657 305,793 294,406  
Net investment income 10,151 9,007 18,979 18,440  
Net income (loss) (4,463) 3,244 9,332 20,867  
Assets 1,137,533   1,137,533   1,098,415
Annuity [Member]          
Summarized financial information for these segments          
Insurance premiums and contract charges earned 6,098 6,516 12,166 12,739  
Net investment income 62,727 57,183 120,776 113,575  
Net income (loss) 13,063 11,747 23,616 24,257  
Assets 7,256,608   7,256,608   7,001,411
Life [Member]          
Summarized financial information for these segments          
Insurance premiums and contract charges earned 28,589 28,203 55,851 54,970  
Net investment income 18,502 18,022 36,486 35,730  
Net income (loss) 4,622 3,643 8,489 7,028  
Assets 1,970,433   1,970,433   1,862,719
Corporate and other [Member]          
Summarized financial information for these segments          
Net investment income 14 6 29 12  
Net income (loss) (1,356) $ (2,451) (4,418) $ (1,694)  
Assets $ 133,248   $ 133,248   $ 131,635