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Segment Information - Summary of Segment Activity (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
segment
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Segment Reporting Information [Line Items]          
Reportable segments | segment     4    
Operating segments | segment     3    
Summarized financial information for these segments          
Insurance premiums and contract charges earned $ 198,935 $ 191,050 $ 590,375 $ 564,860  
Net investment income 92,320 94,847 275,025 270,685  
Net income (loss) 26,551 26,923 44,130 63,942  
Assets 11,044,348   11,044,348   $ 10,576,824
Intersegment eliminations          
Summarized financial information for these segments          
Net investment income (203) (212) (615) (644)  
Assets (30,981)   (30,981)   (36,786)
Property and Casualty          
Summarized financial information for these segments          
Insurance premiums and contract charges earned 163,209 155,727 481,987 461,520  
Property and Casualty | Operating segments          
Summarized financial information for these segments          
Net investment income 9,167 10,018 26,457 28,997  
Net income (loss) 13,407 6,715 2,186 16,047  
Assets 1,156,959   1,156,959   1,110,958
Retirement          
Summarized financial information for these segments          
Insurance premiums and contract charges earned 7,393 6,448 20,753 18,614  
Retirement | Operating segments          
Summarized financial information for these segments          
Net investment income 64,340 66,174 192,921 186,950  
Net income (loss) 13,603 15,732 36,933 39,348  
Assets 7,793,727   7,793,727   7,449,777
Life          
Summarized financial information for these segments          
Insurance premiums and contract charges earned 28,333 28,875 87,635 84,726  
Life | Operating segments          
Summarized financial information for these segments          
Net investment income 18,999 18,852 56,215 55,338  
Net income (loss) 4,788 4,583 14,283 13,072  
Assets 1,988,767   1,988,767   1,912,771
Corporate and Other          
Summarized financial information for these segments          
Net investment income 17 15 47 44  
Net income (loss) (5,247) $ (107) (9,272) $ (4,525)  
Assets $ 135,876   $ 135,876   $ 140,104