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Fair Values of Financial Instruments (Assets and Liabilities Measured on a Recurring Basis by Fair Value Hierarchy) (Details) (Fair Value, Measurements, Recurring [Member], USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Total Fair Value [Member]
   
Assets    
Derivative assets $ 625,236 $ 415,258
Cash and cash equivalents 934,931 1,268,545
2015 notes hedges 144,904 43,105
Counterparty collateral 240,713  
Assets 28,223,726 25,955,713
Liabilities    
2015 notes embedded derivatives 147,150 43,105
2015 warrants 51,077  
Fixed index annuities - embedded derivatives 3,975,862 3,337,556
Liabilities 4,174,311 3,384,922
Total Fair Value [Member] | Equity Securities, Available For Sale [Member]
   
Assets    
Available for sale securities 9,708 53,422
Total Fair Value [Member] | United States Government Full Faith and Credit [Member] | Fixed Maturity Securities [Member]
   
Assets    
Available for sale securities 4,907 5,154
Total Fair Value [Member] | United States Government Sponsored Agencies [Member] | Fixed Maturity Securities [Member]
   
Assets    
Available for sale securities 1,239,603 1,772,025
Total Fair Value [Member] | United States Municipalities, States and Territories [Member] | Fixed Maturity Securities [Member]
   
Assets    
Available for sale securities 3,461,131 3,578,323
Total Fair Value [Member] | Foreign Government Obligations [Member] | Fixed Maturity Securities [Member]
   
Assets    
Available for sale securities 92,682 105,259
Total Fair Value [Member] | Corporate Securities [Member] | Fixed Maturity Securities [Member]
   
Assets    
Available for sale securities 16,741,581 14,466,772
Total Fair Value [Member] | Residential Mortgage Backed Securities [Member] | Fixed Maturity Securities [Member]
   
Assets    
Available for sale securities 2,118,827 2,888,113
Total Fair Value [Member] | Commercial Mortgage Backed Securities [Member] | Fixed Maturity Securities [Member]
   
Assets    
Available for sale securities 1,590,310 357,982
Total Fair Value [Member] | Other Asset Backed Securities [Member] | Fixed Maturity Securities [Member]
   
Assets    
Available for sale securities 1,013,837 998,508
Total Fair Value [Member] | Interest Rate Caps [Member]
   
Assets    
Derivative assets 5,356 3,247
Total Fair Value [Member] | Interest Rate Swap [Member]
   
Liabilities    
Derivative liabilities 222 4,261
Quoted Prices in Active Markets (Level 1) [Member]
   
Assets    
Derivative assets 0 0
Cash and cash equivalents 934,931 1,268,545
2015 notes hedges 0 0
Counterparty collateral 0  
Assets 950,902 1,344,136
Liabilities    
2015 notes embedded derivatives 0 0
2015 warrants 0  
Fixed index annuities - embedded derivatives 0 0
Liabilities 0 0
Quoted Prices in Active Markets (Level 1) [Member] | Equity Securities, Available For Sale [Member]
   
Assets    
Available for sale securities 1,908 36,928
Quoted Prices in Active Markets (Level 1) [Member] | United States Government Full Faith and Credit [Member] | Fixed Maturity Securities [Member]
   
Assets    
Available for sale securities 4,907 5,154
Quoted Prices in Active Markets (Level 1) [Member] | United States Government Sponsored Agencies [Member] | Fixed Maturity Securities [Member]
   
Assets    
Available for sale securities 0 0
Quoted Prices in Active Markets (Level 1) [Member] | United States Municipalities, States and Territories [Member] | Fixed Maturity Securities [Member]
   
Assets    
Available for sale securities 0 0
Quoted Prices in Active Markets (Level 1) [Member] | Foreign Government Obligations [Member] | Fixed Maturity Securities [Member]
   
Assets    
Available for sale securities 0 0
Quoted Prices in Active Markets (Level 1) [Member] | Corporate Securities [Member] | Fixed Maturity Securities [Member]
   
Assets    
Available for sale securities 8,794 33,131
Quoted Prices in Active Markets (Level 1) [Member] | Residential Mortgage Backed Securities [Member] | Fixed Maturity Securities [Member]
   
Assets    
Available for sale securities 0 0
Quoted Prices in Active Markets (Level 1) [Member] | Commercial Mortgage Backed Securities [Member] | Fixed Maturity Securities [Member]
   
Assets    
Available for sale securities 0 0
Quoted Prices in Active Markets (Level 1) [Member] | Other Asset Backed Securities [Member] | Fixed Maturity Securities [Member]
   
Assets    
Available for sale securities 362 378
Quoted Prices in Active Markets (Level 1) [Member] | Interest Rate Caps [Member]
   
Assets    
Derivative assets 0 0
Quoted Prices in Active Markets (Level 1) [Member] | Interest Rate Swap [Member]
   
Liabilities    
Derivative liabilities 0 0
Significant Other Observable Inputs (Level 2) [Member]
   
Assets    
Derivative assets 625,236 415,258
Cash and cash equivalents 0 0
2015 notes hedges 144,904 43,105
Counterparty collateral 240,713  
Assets 27,271,510 24,609,765
Liabilities    
2015 notes embedded derivatives 147,150 43,105
2015 warrants 51,077  
Fixed index annuities - embedded derivatives 0 0
Liabilities 198,449 47,366
Significant Other Observable Inputs (Level 2) [Member] | Equity Securities, Available For Sale [Member]
   
Assets    
Available for sale securities 7,800 16,494
Significant Other Observable Inputs (Level 2) [Member] | United States Government Full Faith and Credit [Member] | Fixed Maturity Securities [Member]
   
Assets    
Available for sale securities 0 0
Significant Other Observable Inputs (Level 2) [Member] | United States Government Sponsored Agencies [Member] | Fixed Maturity Securities [Member]
   
Assets    
Available for sale securities 1,239,603 1,772,025
Significant Other Observable Inputs (Level 2) [Member] | United States Municipalities, States and Territories [Member] | Fixed Maturity Securities [Member]
   
Assets    
Available for sale securities 3,461,131 3,578,323
Significant Other Observable Inputs (Level 2) [Member] | Foreign Government Obligations [Member] | Fixed Maturity Securities [Member]
   
Assets    
Available for sale securities 92,682 105,259
Significant Other Observable Inputs (Level 2) [Member] | Corporate Securities [Member] | Fixed Maturity Securities [Member]
   
Assets    
Available for sale securities 16,732,787 14,433,641
Significant Other Observable Inputs (Level 2) [Member] | Residential Mortgage Backed Securities [Member] | Fixed Maturity Securities [Member]
   
Assets    
Available for sale securities 2,117,513 2,886,301
Significant Other Observable Inputs (Level 2) [Member] | Commercial Mortgage Backed Securities [Member] | Fixed Maturity Securities [Member]
   
Assets    
Available for sale securities 1,590,310 357,982
Significant Other Observable Inputs (Level 2) [Member] | Other Asset Backed Securities [Member] | Fixed Maturity Securities [Member]
   
Assets    
Available for sale securities 1,013,475 998,130
Significant Other Observable Inputs (Level 2) [Member] | Interest Rate Caps [Member]
   
Assets    
Derivative assets 5,356 3,247
Significant Other Observable Inputs (Level 2) [Member] | Interest Rate Swap [Member]
   
Liabilities    
Derivative liabilities 222 4,261
Significant Unobservable Inputs (Level 3) [Member]
   
Assets    
Derivative assets 0 0
Cash and cash equivalents 0 0
2015 notes hedges 0 0
Counterparty collateral 0  
Assets 1,314 1,812
Liabilities    
2015 notes embedded derivatives 0 0
2015 warrants 0  
Fixed index annuities - embedded derivatives 3,975,862 3,337,556
Liabilities 3,975,862 3,337,556
Significant Unobservable Inputs (Level 3) [Member] | Equity Securities, Available For Sale [Member]
   
Assets    
Available for sale securities 0 0
Significant Unobservable Inputs (Level 3) [Member] | United States Government Full Faith and Credit [Member] | Fixed Maturity Securities [Member]
   
Assets    
Available for sale securities 0 0
Significant Unobservable Inputs (Level 3) [Member] | United States Government Sponsored Agencies [Member] | Fixed Maturity Securities [Member]
   
Assets    
Available for sale securities 0 0
Significant Unobservable Inputs (Level 3) [Member] | United States Municipalities, States and Territories [Member] | Fixed Maturity Securities [Member]
   
Assets    
Available for sale securities 0 0
Significant Unobservable Inputs (Level 3) [Member] | Foreign Government Obligations [Member] | Fixed Maturity Securities [Member]
   
Assets    
Available for sale securities 0 0
Significant Unobservable Inputs (Level 3) [Member] | Corporate Securities [Member] | Fixed Maturity Securities [Member]
   
Assets    
Available for sale securities 0 0
Significant Unobservable Inputs (Level 3) [Member] | Residential Mortgage Backed Securities [Member] | Fixed Maturity Securities [Member]
   
Assets    
Available for sale securities 1,314 1,812
Significant Unobservable Inputs (Level 3) [Member] | Commercial Mortgage Backed Securities [Member] | Fixed Maturity Securities [Member]
   
Assets    
Available for sale securities 0 0
Significant Unobservable Inputs (Level 3) [Member] | Other Asset Backed Securities [Member] | Fixed Maturity Securities [Member]
   
Assets    
Available for sale securities 0 0
Significant Unobservable Inputs (Level 3) [Member] | Interest Rate Caps [Member]
   
Assets    
Derivative assets 0 0
Significant Unobservable Inputs (Level 3) [Member] | Interest Rate Swap [Member]
   
Liabilities    
Derivative liabilities $ 0 $ 0