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Fair Values of Financial Instruments (Narrative) (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Basis_Points
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Basis_Points
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Assets, Level 1 to Level 2 transfers, amount $ 0   $ 0   $ 0
Liabilities, Level 1 to Level 2 transfers, amount 0   0   0
Assets, Level 2 to Level 1 transfers, amount 0   0   0
Liabilities, Level 2 to Level 1 transfers, amount 0   0   0
Assets, transfers into Level 3, amount 0 $ 0 0 $ 0  
Liabilities, transfers into Level 3, amount 0 0 0 0  
Assets, transfers out of Level 3, amount 0 0 0 0  
Liabilities, transfers out of Level 3, amount 0 $ 0 0 $ 0  
Coinsurance ceded, fixed index annuities embedded derivatives $ 5,017,255   $ 5,017,255   4,858,289
Fair Value, Sensitivity, Increase in Discount Rate by 10 Percent          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fair value, sensitivity, discount rate adjustment (basis points) | Basis_Points 100   100    
Fixed index annuities embedded derivative, adjustment due to change in discount rate     $ (553,900)    
Deferred policy scquisition costs and deferred sales inducements, combined balance, adjustment due to change in discount rate     $ (330,200)    
Fair Value, Sensitivity, Decrease in Discount Rate by 10 Percent          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fair value, sensitivity, discount rate adjustment (basis points) | Basis_Points 100   100    
Fixed index annuities embedded derivative, adjustment due to change in discount rate     $ 614,700    
Deferred policy scquisition costs and deferred sales inducements, combined balance, adjustment due to change in discount rate     352,100    
Fixed Index Annuities - Embedded Derivatives          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Coinsurance ceded, fixed index annuities embedded derivatives $ 592,600   $ 592,600   $ 539,700