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Fair Values of Financial Instruments Fair Values of Financial Instruments Reconciliation of Beginning and Ending Balances of Level 3 Liabilities (Details) (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Mar. 31, 2012
Dec. 31, 2011
Mar. 31, 2011
Dec. 31, 2010
Fair Value, Measurements, Recurring [Member]
                
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value $ 3,266,782,000 $ 2,399,097,000 $ 3,266,782,000 $ 2,399,097,000 $ 2,914,948,000 $ 2,530,496,000 $ 2,368,533,000 $ 1,971,383,000
Premiums Less Benefis Level 3 Liabilities 229,340,000 274,579,000 418,845,000 742,255,000        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 122,494,000 (244,015,000) 317,441,000 (314,541,000)        
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   100          
Fair Value Liability Measured on Recurring Basis, Fixed Index Annuities Embedded Derivative 232,600,000   232,600,000          
Deferred Policy Acquisition Costs and Deferred Sales Inducements, Adjustment Due to Change in Discount Rate, Combined Balance 141,600,000   141,600,000          
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   100          
Fair Value Liability Measured on Recurring Basis, Fixed Index Annuities Embedded Derivative 260,400,000   260,400,000          
Deferred Policy Acquisition Costs and Deferred Sales Inducements, Adjustment Due to Change in Discount Rate, Combined Balance $ 159,200,000   $ 159,200,000