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Segment Information - Summary of Segment Activity (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2018
USD ($)
segment
Mar. 31, 2017
USD ($)
Dec. 31, 2017
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 $ 202,998 $ 195,722  
Net investment income 91,864 90,711  
Net income (loss) 20,155 15,318  
Assets 11,068,542   $ 11,198,340
Intersegment eliminations      
Summarized financial information for these segments      
Net investment income (197) (208)  
Assets (30,535)   (42,482)
Property and Casualty      
Summarized financial information for these segments      
Insurance premiums and contract charges earned 165,458 158,318  
Property and Casualty | Operating segments      
Summarized financial information for these segments      
Net investment income 9,516 9,177  
Net income (loss) 9,722 2,735  
Assets 1,202,791   1,217,394
Retirement      
Summarized financial information for these segments      
Insurance premiums and contract charges earned 8,068 6,601  
Retirement | Operating segments      
Summarized financial information for these segments      
Net investment income 64,169 63,442  
Net income (loss) 11,421 11,530  
Assets 7,969,848   8,063,912
Life      
Summarized financial information for these segments      
Insurance premiums and contract charges earned 29,472 30,803  
Life | Operating segments      
Summarized financial information for these segments      
Net investment income 18,340 18,288  
Net income (loss) 3,787 3,885  
Assets 1,785,912   1,815,732
Corporate and Other      
Summarized financial information for these segments      
Net investment income 36 12  
Net income (loss) (4,775) $ (2,832)  
Assets $ 140,526   $ 143,784