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Fair Values of Financial Instruments (Narrative) (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
Basis_Points
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Basis_Points
Sep. 30, 2019
USD ($)
Dec. 31, 2019
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, Level 3 transfers, amount, net 0 $ 0 0 $ 0  
Liabilities, Level 3 transfers, amount, net $ 0 $ 0 $ 0 $ 0  
Maximum | Measurement Input, Discount Rate          
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     $ (579,100)    
Deferred policy scquisition costs and deferred sales inducements, combined balance, adjustment due to change in discount rate     $ (243,800)    
Minimum | Measurement Input, Discount Rate          
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     $ 622,200    
Deferred policy scquisition costs and deferred sales inducements, combined balance, adjustment due to change in discount rate     $ 266,400