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Segment Information - Summary of Segment Activity (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
segment
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Segment Reporting Information [Line Items]      
Number of reportable segments | segment 4    
Number of operating segments | segment 3    
Summarized financial information for these segments      
Insurance premiums and contract charges earned $ 209,785 $ 202,998  
Net investment income 92,800 91,864  
Net income (loss) 32,166 20,155  
Assets 11,561,080   $ 11,031,896
Intersegment eliminations      
Summarized financial information for these segments      
Net investment income (186) (197)  
Assets (31,328)   (41,800)
Property and Casualty      
Summarized financial information for these segments      
Insurance premiums and contract charges earned 170,840 165,458  
Property and Casualty | Operating segments      
Summarized financial information for these segments      
Net investment income 10,218 9,516  
Net income (loss) 15,052 9,722  
Assets 1,238,041   1,236,362
Retirement      
Summarized financial information for these segments      
Insurance premiums and contract charges earned 8,578 8,068  
Retirement | Operating segments      
Summarized financial information for these segments      
Net investment income 64,739 64,169  
Net income (loss) 12,151 11,421  
Assets 8,307,656   7,866,969
Life      
Summarized financial information for these segments      
Insurance premiums and contract charges earned 30,367 29,472  
Life | Operating segments      
Summarized financial information for these segments      
Net investment income 18,052 18,340  
Net income (loss) 3,277 3,787  
Assets 1,883,554   1,821,351
Corporate and Other      
Summarized financial information for these segments      
Net investment income (23) 36  
Net income (loss) 1,686 $ (4,775)  
Assets $ 163,157   $ 149,014