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Recoverable from Reinsurers (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Ceded Credit Risk [Line Items]    
Recoverable from reinsurers $ 524,201 $ 522,562
% of Total | Reinsurer Concentration Risk    
Ceded Credit Risk [Line Items]    
Reinsurer, % of Total 100.00% 100.00%
Loyal American Life Insurance Co (Cigna) | A-    
Ceded Credit Risk [Line Items]    
Recoverable from reinsurers $ 139,269 $ 133,646
Loyal American Life Insurance Co (Cigna) | A- | % of Total | Reinsurer Concentration Risk    
Ceded Credit Risk [Line Items]    
Reinsurer, % of Total 26.50% 25.50%
Great American Life Insurance Co | A    
Ceded Credit Risk [Line Items]    
Recoverable from reinsurers $ 46,965 $ 44,748
Great American Life Insurance Co | A | % of Total | Reinsurer Concentration Risk    
Ceded Credit Risk [Line Items]    
Reinsurer, % of Total 9.00% 8.60%
Hannover Life Reassurance Co | A    
Ceded Credit Risk [Line Items]    
Recoverable from reinsurers $ 337,967 $ 344,168
Hannover Life Reassurance Co | A | % of Total | Reinsurer Concentration Risk    
Ceded Credit Risk [Line Items]    
Reinsurer, % of Total 64.50% 65.90%