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Fair Value Measurements Financial Instruments not Carried at Fair Value (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fixed maturities held-to-maturity $ 265,186   $ 264,966  
Mortgage loans 587   594  
Policy loans 62,011   60,166  
Other Short-term Investments 0   251  
Cash and cash equivalents, at carrying value 45,355 $ 41,430 82,827 $ 50,708
Liability for future policy benefits individual and group annuities $ 65,952   64,933  
Mortgage Loans on Real Estate, Interest Rate 6.30% 6.40%    
Mortgage loan maturity lower end range 1 year 1 year    
Mortgage loan maturity higher end range 30 years 30 years    
Mortgage loans interest rate used to estimate fair value 6.20%      
Insurance policy loans interest rate 7.70% 7.70%    
Fair value minimum interest rate of investment contract 1.60%      
Fair value maximum rate of investment contract 5.71%      
Carrying (Reported) Amount, Fair Value Disclosure [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fixed maturities held-to-maturity $ 255,536   259,953  
Mortgage loans 587   594  
Policy loans 62,011   60,166  
Other Short-term Investments 0   251  
Cash and cash equivalents, at carrying value 45,355   82,827  
Liability for future policy benefits individual and group annuities 47,943   47,222  
Estimate of Fair Value, Fair Value Disclosure [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fixed maturities held-to-maturity 265,186   264,966  
Mortgage loans 608   617  
Policy loans 62,011   60,166  
Other Short-term Investments 0   251  
Cash and cash equivalents, fair value disclosure 45,355   82,827  
Liability for future policy benefits individual and group annuities $ 50,234   $ 46,905