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Fair Values of Financial Instruments (Narrative) (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
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 221,459,000   221,459,000   215,042,000
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) 100   100    
Fixed index annuities embedded derivative, adjustment due to change in discount rate     (350,000,000)    
Deferred policy scquisition costs and deferred sales inducements, combined balance, adjustment due to change in discount rate     (209,200,000)    
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) 100   100    
Fixed index annuities embedded derivative, adjustment due to change in discount rate     391,700,000    
Deferred policy scquisition costs and deferred sales inducements, combined balance, adjustment due to change in discount rate     230,400,000    
Fair Value, Measurements, Recurring [Member]
          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Other investments $ 0   $ 0