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Segment Information - Summary of Segment Activity (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
segment
Sep. 30, 2017
USD ($)
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 $ 206,820 $ 198,935 $ 615,428 $ 590,375  
Net investment income 99,083 92,320 288,048 275,025  
Net income (loss) 12,528 26,551 38,600 44,130  
Assets 11,280,765   11,280,765   $ 11,198,340
Intersegment eliminations          
Summarized financial information for these segments          
Net investment income (192) (203) (583) (615)  
Assets (38,111)   (38,111)   (42,482)
Property and Casualty          
Summarized financial information for these segments          
Insurance premiums and contract charges earned 168,653 163,209 501,444 481,987  
Property and Casualty | Operating segments          
Summarized financial information for these segments          
Net investment income 12,361 9,167 32,177 26,457  
Net income (loss) (3,190) 13,407 (4,364) 2,186  
Assets 1,241,538   1,241,538   1,217,394
Retirement          
Summarized financial information for these segments          
Insurance premiums and contract charges earned 8,031 7,393 23,924 20,753  
Retirement | Operating segments          
Summarized financial information for these segments          
Net investment income 67,750 64,340 199,706 192,921  
Net income (loss) 12,120 13,603 37,682 36,933  
Assets 8,143,384   8,143,384   8,063,912
Life          
Summarized financial information for these segments          
Insurance premiums and contract charges earned 30,136 28,333 90,060 87,635  
Life | Operating segments          
Summarized financial information for these segments          
Net investment income 19,123 18,999 56,629 56,215  
Net income (loss) 5,331 4,788 14,997 14,283  
Assets 1,787,361   1,787,361   1,815,732
Corporate and Other          
Summarized financial information for these segments          
Net investment income 41 17 119 47  
Net income (loss) (1,733) $ (5,247) (9,715) $ (9,272)  
Assets $ 146,593   $ 146,593   $ 143,784