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Investments (Cash, Cash Equivalents and Investments) (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]        
Fixed maturity securities $ 1,341,339 $ 1,231,039    
Fixed maturity securities, percent 90.70% 88.70%    
Equity security $ 15,827 $ 15,068    
Equity securities, percent 1.10% 1.10%    
Mortgage loans $ 182 $ 186    
Mortgage loans, percent 0.00% 0.00%    
Policy loans $ 81,545 $ 80,825    
Policy loans, percent 5.50% 5.80%    
Real estate and other long-term investments $ 2,593 $ 7,223    
Real estate and other long-term investments, percent 0.20% 0.50%    
Short-term investments $ 2,455 $ 7,865    
Short-term investments, percent 0.20% 0.60%    
Cash and cash equivalents $ 34,568 $ 45,492 $ 63,333 $ 46,064
Cash and cash equivalents, percent 2.30% 3.30%    
Total cash, cash equivalents and investments $ 1,478,509 $ 1,387,698    
Total cash, cash equivalents and investments, percent 100.00% 100.00%