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Segment Information - Summary of Segment Activity (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
segment
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Segment Reporting Information [Line Items]          
Number of reportable segments | segment     5    
Number of operating segments | segment     4    
Summarized financial information for these segments          
Insurance premiums and contract charges earned $ 239,681 $ 206,820 $ 657,562 $ 615,428  
Net investment income 93,071 99,083 279,329 288,048  
Net income 25,454 12,528 151,442 38,600  
Assets 12,332,545   12,332,545   $ 11,031,896
Intersegment eliminations          
Summarized financial information for these segments          
Net investment income (569) (192) (934) (583)  
Assets (52,744)   (52,744)   (41,800)
Property and Casualty          
Summarized financial information for these segments          
Insurance premiums and contract charges earned 170,483 168,653 512,626 501,444  
Property and Casualty | Operating segments          
Summarized financial information for these segments          
Net investment income 10,726 12,361 33,587 32,177  
Net income 14,194 (3,190) 34,347 (4,364)  
Assets 1,297,585   1,297,585   1,236,362
Supplemental          
Summarized financial information for these segments          
Insurance premiums and contract charges earned 32,921   32,921    
Net investment income 3,691   3,691    
Net income 6,943   6,943    
Assets 745,345   745,345    
Retirement          
Summarized financial information for these segments          
Insurance premiums and contract charges earned 6,624 8,031 22,133 23,924  
Retirement | Operating segments          
Summarized financial information for these segments          
Net investment income 60,770 67,750 188,193 199,706  
Net income 5,915 12,120 (6,979) 37,682  
Assets 8,328,718   8,328,718   7,866,969
Life          
Summarized financial information for these segments          
Insurance premiums and contract charges earned 29,653 30,136 89,882 90,060  
Life | Operating segments          
Summarized financial information for these segments          
Net investment income 18,453 19,123 54,829 56,629  
Net income 5,101 5,331 13,617 14,997  
Assets 1,857,331   1,857,331   1,821,351
Corporate and Other          
Summarized financial information for these segments          
Net investment income 0 41 (37) 119  
Net income (6,699) $ (1,733) 103,514 $ (9,715)  
Assets $ 156,310   $ 156,310   $ 149,014