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Fair Values of Financial Instruments (Narrative) (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
Basis_Points
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
Basis_Points
Sep. 30, 2014
USD ($)
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   $ 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  
Other investments 284,994   284,994   $ 286,726
Fair Value, Measurements, Recurring [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Other investments $ 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   100    
Fixed index annuities embedded derivative, adjustment due to change in discount rate     $ (383,900)    
Deferred policy scquisition costs and deferred sales inducements, combined balance, adjustment due to change in discount rate     $ (269,200)    
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   100    
Fixed index annuities embedded derivative, adjustment due to change in discount rate     $ 429,300    
Deferred policy scquisition costs and deferred sales inducements, combined balance, adjustment due to change in discount rate     $ 223,800