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Fair Values of Financial Instruments Reconciliation of Beginning and Ending Balances of Level 3 Liabilities (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair Value Liability Measured on Recurring Basis, Fixed Index Annuities Embedded Derivative $ 3,337,556,000 $ 2,530,496,000
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value 2,530,496,000 1,971,383,000
Premiums Less Benefis Level 3 Liabilities 765,942,000 919,375,000
Change in unrealized losses (gains), net 41,118,000 (360,262,000)
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value   2,530,496,000
Fair Value, Sensitivity, Increase in Discount Rate by 10 Percent [Member]
    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair Value, Sensitivity, Discount Rate Adjustment 100  
Fair Value Liability Measured on Recurring Basis, Fixed Index Annuities Embedded Derivative 226,000,000  
Deferred Policy Acquisition Costs and Deferred Sales Inducements, Adjustment Due to Change in Discount Rate, Combined Balance 136,700,000  
Fair Value, Sensitivity, Decrease in Discount Rate by 10 Percent [Member]
    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair Value, Sensitivity, Discount Rate Adjustment 100  
Fair Value Liability Measured on Recurring Basis, Fixed Index Annuities Embedded Derivative 252,200,000  
Deferred Policy Acquisition Costs and Deferred Sales Inducements, Adjustment Due to Change in Discount Rate, Combined Balance $ 152,900,000