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Investments (Cash, Cash Equivalents and Investments) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]        
Fixed maturity securities $ 1,295,514 $ 1,231,039    
Fixed maturity securities, percent 90.00% 88.70%    
Equity security $ 15,672 $ 15,068    
Equity securities, percent 1.10% 1.10%    
Mortgage loans $ 185 $ 186    
Mortgage loans, percent 0.00% 0.00%    
Policy loans $ 81,474 $ 80,825    
Policy loans, percent 5.70% 5.80%    
Real estate and other long-term investments $ 5,715 $ 7,223    
Real estate and other long-term investments, percent 0.40% 0.50%    
Short-term Investments $ 7,914 $ 7,865    
Short-term investments, percent 0.40% 0.60%    
Cash and cash equivalents $ 34,093 $ 45,492 $ 41,247 $ 46,064
Cash and cash equivalents, percent 2.40% 3.30%    
Total cash, cash equivalents and investments $ 1,440,567 $ 1,387,698    
Total cash, cash equivalents and investments, percent 100.00% 100.00%