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Segment Information - Summary of Segment Activity (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
segment
Jun. 30, 2017
USD ($)
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 $ 205,610 $ 195,718 $ 408,608 $ 391,440  
Net investment income 97,101 91,994 188,965 182,705  
Net income (loss) 5,917 2,261 26,072 17,579  
Assets 11,156,214   11,156,214   $ 11,198,340
Intersegment eliminations          
Summarized financial information for these segments          
Net investment income (194) (204) (391) (412)  
Assets (33,148)   (33,148)   (42,482)
Property and Casualty          
Summarized financial information for these segments          
Insurance premiums and contract charges earned 167,333 160,460 332,791 318,778  
Property and Casualty | Operating segments          
Summarized financial information for these segments          
Net investment income 10,300 8,113 19,816 17,290  
Net income (loss) (10,896) (13,956) (1,174) (11,221)  
Assets 1,227,650   1,227,650   1,217,394
Retirement          
Summarized financial information for these segments          
Insurance premiums and contract charges earned 7,825 6,759 15,893 13,360  
Retirement | Operating segments          
Summarized financial information for these segments          
Net investment income 67,787 65,139 131,956 128,581  
Net income (loss) 14,141 11,800 25,562 23,330  
Assets 8,033,572   8,033,572   8,063,912
Life          
Summarized financial information for these segments          
Insurance premiums and contract charges earned 30,452 28,499 59,924 59,302  
Life | Operating segments          
Summarized financial information for these segments          
Net investment income 19,166 18,928 37,506 37,216  
Net income (loss) 5,879 5,610 9,666 9,495  
Assets 1,786,525   1,786,525   1,815,732
Corporate and Other          
Summarized financial information for these segments          
Net investment income 42 18 78 30  
Net income (loss) (3,207) $ (1,193) (7,982) $ (4,025)  
Assets $ 141,615   $ 141,615   $ 143,784