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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
Dec. 31, 2013
Dec. 31, 2012
Total Fair Value [Member]
   
Assets    
Derivative assets $ 856,050 $ 415,258
Cash and cash equivalents 897,529 1,268,545
Counterparty collateral 315,824  
Assets 28,801,484 25,955,713
Liabilities    
Fixed index annuities - embedded derivatives 4,406,163 3,337,556
Liabilities 4,513,204 3,384,922
Total Fair Value [Member] | Interest Rate Caps [Member]
   
Assets    
Interest rate derivative assets 6,103 3,247
Total Fair Value [Member] | Interest Rate Swap [Member]
   
Assets    
Interest rate derivative assets 712  
Liabilities    
Interest rate derivative liabilities   4,261
Total Fair Value [Member] | 2015 Notes Hedges [Member]
   
Assets    
2015 notes hedges 107,041 43,105
Total Fair Value [Member] | 2015 Notes Embedded Derivative [Member]
   
Liabilities    
2015 notes embedded conversion derivative 107,041 43,105
Total Fair Value [Member] | Equity Securities, Available For Sale [Member]
   
Assets    
Available for sale securities 7,778 53,422
Total Fair Value [Member] | United States Government Full Faith and Credit [Member] | Fixed Maturity Securities [Member]
   
Assets    
Available for sale securities 42,925 5,154
Total Fair Value [Member] | United States Government Sponsored Agencies [Member] | Fixed Maturity Securities [Member]
   
Assets    
Available for sale securities 1,194,289 1,772,025
Total Fair Value [Member] | United States Municipalities, States and Territories [Member] | Fixed Maturity Securities [Member]
   
Assets    
Available for sale securities 3,306,743 3,578,323
Total Fair Value [Member] | Foreign Government Obligations [Member] | Fixed Maturity Securities [Member]
   
Assets    
Available for sale securities 91,557 105,259
Total Fair Value [Member] | Corporate Securities [Member] | Fixed Maturity Securities [Member]
   
Assets    
Available for sale securities 17,233,037 14,466,772
Total Fair Value [Member] | Residential Mortgage Backed Securities [Member] | Fixed Maturity Securities [Member]
   
Assets    
Available for sale securities 1,971,960 2,888,113
Total Fair Value [Member] | Commercial Mortgage Backed Securities [Member] | Fixed Maturity Securities [Member]
   
Assets    
Available for sale securities 1,735,460 357,982
Total Fair Value [Member] | Other Asset Backed Securities [Member] | Fixed Maturity Securities [Member]
   
Assets    
Available for sale securities 1,034,476 998,508
Quoted Prices in Active Markets (Level 1) [Member]
   
Assets    
Derivative assets 0 0
Cash and cash equivalents 897,529 1,268,545
Counterparty collateral 0  
Assets 902,713 1,344,136
Liabilities    
Fixed index annuities - embedded derivatives 0 0
Liabilities 0 0
Quoted Prices in Active Markets (Level 1) [Member] | Interest Rate Caps [Member]
   
Assets    
Interest rate derivative assets 0 0
Quoted Prices in Active Markets (Level 1) [Member] | Interest Rate Swap [Member]
   
Assets    
Interest rate derivative assets 0  
Liabilities    
Interest rate derivative liabilities   0
Quoted Prices in Active Markets (Level 1) [Member] | 2015 Notes Hedges [Member]
   
Assets    
2015 notes hedges 0 0
Quoted Prices in Active Markets (Level 1) [Member] | 2015 Notes Embedded Derivative [Member]
   
Liabilities    
2015 notes embedded conversion derivative 0 0
Quoted Prices in Active Markets (Level 1) [Member] | Equity Securities, Available For Sale [Member]
   
Assets    
Available for sale securities 0 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 4,805 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 20 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 359 378
Significant Other Observable Inputs (Level 2) [Member]
   
Assets    
Derivative assets 856,050 415,258
Cash and cash equivalents 0 0
Counterparty collateral 315,824  
Assets 27,897,395 24,609,765
Liabilities    
Fixed index annuities - embedded derivatives 0 0
Liabilities 107,041 47,366
Significant Other Observable Inputs (Level 2) [Member] | Interest Rate Caps [Member]
   
Assets    
Interest rate derivative assets 6,103 3,247
Significant Other Observable Inputs (Level 2) [Member] | Interest Rate Swap [Member]
   
Assets    
Interest rate derivative assets 712  
Liabilities    
Interest rate derivative liabilities   4,261
Significant Other Observable Inputs (Level 2) [Member] | 2015 Notes Hedges [Member]
   
Assets    
2015 notes hedges 107,041 43,105
Significant Other Observable Inputs (Level 2) [Member] | 2015 Notes Embedded Derivative [Member]
   
Liabilities    
2015 notes embedded conversion derivative 107,041 43,105
Significant Other Observable Inputs (Level 2) [Member] | Equity Securities, Available For Sale [Member]
   
Assets    
Available for sale securities 7,778 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 38,120 0
Significant Other Observable Inputs (Level 2) [Member] | United States Government Sponsored Agencies [Member] | Fixed Maturity Securities [Member]
   
Assets    
Available for sale securities 1,194,289 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 3,306,743 3,578,323
Significant Other Observable Inputs (Level 2) [Member] | Foreign Government Obligations [Member] | Fixed Maturity Securities [Member]
   
Assets    
Available for sale securities 91,557 105,259
Significant Other Observable Inputs (Level 2) [Member] | Corporate Securities [Member] | Fixed Maturity Securities [Member]
   
Assets    
Available for sale securities 17,233,017 14,433,641
Significant Other Observable Inputs (Level 2) [Member] | Residential Mortgage Backed Securities [Member] | Fixed Maturity Securities [Member]
   
Assets    
Available for sale securities 1,970,584 2,886,301
Significant Other Observable Inputs (Level 2) [Member] | Commercial Mortgage Backed Securities [Member] | Fixed Maturity Securities [Member]
   
Assets    
Available for sale securities 1,735,460 357,982
Significant Other Observable Inputs (Level 2) [Member] | Other Asset Backed Securities [Member] | Fixed Maturity Securities [Member]
   
Assets    
Available for sale securities 1,034,117 998,130
Significant Unobservable Inputs (Level 3) [Member]
   
Assets    
Derivative assets 0 0
Cash and cash equivalents 0 0
Counterparty collateral 0  
Assets 1,376 1,812
Liabilities    
Fixed index annuities - embedded derivatives 4,406,163 3,337,556
Liabilities 4,406,163 3,337,556
Significant Unobservable Inputs (Level 3) [Member] | Interest Rate Caps [Member]
   
Assets    
Interest rate derivative assets 0 0
Significant Unobservable Inputs (Level 3) [Member] | Interest Rate Swap [Member]
   
Assets    
Interest rate derivative assets 0  
Liabilities    
Interest rate derivative liabilities   0
Significant Unobservable Inputs (Level 3) [Member] | 2015 Notes Hedges [Member]
   
Assets    
2015 notes hedges 0 0
Significant Unobservable Inputs (Level 3) [Member] | 2015 Notes Embedded Derivative [Member]
   
Liabilities    
2015 notes embedded conversion derivative 0 0
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 1,376 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