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Fair Value Measurements Financial Instruments not Carried at Fair Value (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fixed maturities held-to-maturity, at amortized cost $ 233,961 $ 247,004    
Fixed maturities held-to-maturity, fair value 241,377 252,545    
Mortgage loans 195 232    
Policy loans 73,735 66,672    
Short-term investments 0 508    
Cash and cash equivalents, at carrying value 46,064 35,510 $ 82,827 $ 50,708
Liability for future policy benefits individual and group annuities $ 73,688 $ 69,003    
Mortgage loans on real estate, interest rate 6.60% 6.80%    
Mortgage loan maturity lower end range 21 years      
Mortgage loan maturity higher end range 25 years      
Mortgage loans interest rate used to estimate fair value 6.25% 6.25%    
Insurance policy loans interest rate 7.70% 7.70%    
Fair value minimum interest rate of investment contract 1.84%      
Fair value maximum rate of investment contract 3.34%      
Carrying (Reported) Amount, Fair Value Disclosure [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fixed maturities held-to-maturity, at amortized cost $ 233,961 $ 247,004    
Mortgage loans 195 232    
Policy loans 73,735 66,672    
Short-term investments 0 508    
Cash and cash equivalents, at carrying value 46,064 35,510    
Liability for future policy benefits individual and group annuities 55,035 50,952    
Estimate of Fair Value, Fair Value Disclosure [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fixed maturities held-to-maturity, fair value 241,377 252,545    
Mortgage loans 228 269    
Policy loans 73,735 66,672    
Short-term investments 0 508    
Cash and cash equivalents, fair value disclosure 46,064 35,510    
Liability for future policy benefits individual and group annuities $ 57,575 $ 52,173