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Segment Information - Summary of Segment Activity (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
segment
Jun. 30, 2016
USD ($)
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 $ 195,718 $ 188,360 $ 391,440 $ 373,810  
Net investment income 91,994 91,179 182,705 175,838  
Net income (loss) 2,261 11,866 17,579 37,019  
Assets 10,876,135   10,876,135   $ 10,576,824
Intersegment eliminations          
Summarized financial information for these segments          
Net investment income (204) (215) (412) (432)  
Assets (29,222)   (29,222)   (36,786)
Property and Casualty          
Summarized financial information for these segments          
Insurance premiums and contract charges earned 160,460 153,673 318,778 305,793  
Property and Casualty | Operating segments          
Summarized financial information for these segments          
Net investment income 8,113 10,151 17,290 18,979  
Net income (loss) (13,956) (4,463) (11,221) 9,332  
Assets 1,133,015   1,133,015   1,110,958
Retirement          
Summarized financial information for these segments          
Insurance premiums and contract charges earned 6,759 6,098 13,360 12,166  
Retirement | Operating segments          
Summarized financial information for these segments          
Net investment income 65,139 62,727 128,581 120,776  
Net income (loss) 11,800 13,063 23,330 23,616  
Assets 7,671,701   7,671,701   7,449,777
Life          
Summarized financial information for these segments          
Insurance premiums and contract charges earned 28,499 28,589 59,302 55,851  
Life | Operating segments          
Summarized financial information for these segments          
Net investment income 18,928 18,502 37,216 36,486  
Net income (loss) 5,610 4,622 9,495 8,489  
Assets 1,972,540   1,972,540   1,912,771
Corporate and Other          
Summarized financial information for these segments          
Net investment income 18 14 30 29  
Net income (loss) (1,193) $ (1,356) (4,025) $ (4,418)  
Assets $ 128,101   $ 128,101   $ 140,104