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Fair Values of Financial Instruments (Narrative) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
USD ($)
Basis_Points
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets, Level 1 to Level 2 transfers, amount $ 0 $ 0  
Liabilities, Level 1 to Level 2 transfers, amount 0 0  
Assets, Level 2 to Level 1 transfers, amount 0 0  
Liabilities, Level 2 to Level 1 transfers, amount 0 0  
Assets, transfers into Level 3, amount 0 0 $ 0
Liabilities, transfers into Level 3, amount 0 0 0
Assets, transfers out of Level 3, amount 0 0 0
Liabilities, transfers out of Level 3, amount $ 0 $ 0 $ 0
Fair Value, Sensitivity, Increase in Discount Rate by 10 Percent [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value, sensitivity, discount rate adjustment (basis points) | Basis_Points 100    
Fixed index annuities embedded derivative, adjustment due to change in discount rate $ (451,400)    
Deferred policy acquisition costs and deferred sales inducements, combined balance, adjustment due to change in discount rate $ (276,400)    
Fair Value, Sensitivity, Decrease in Discount Rate by 10 Percent [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value, sensitivity, discount rate adjustment (basis points) | Basis_Points 100    
Fixed index annuities embedded derivative, adjustment due to change in discount rate $ 504,500    
Deferred policy acquisition costs and deferred sales inducements, combined balance, adjustment due to change in discount rate $ 299,500