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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
Mar. 31, 2014
Dec. 31, 2013
Total Fair Value [Member]
   
Assets    
Derivative assets $ 790,396 $ 856,050
Cash and cash equivalents 679,172 897,529
Counterparty collateral 275,558 315,824
Assets 30,159,932 28,801,484
Liabilities    
Fixed index annuities - embedded derivatives 4,755,913 4,406,163
Liabilities 4,843,243 4,513,204
Total Fair Value [Member] | Interest Rate Caps [Member]
   
Assets    
Interest rate derivative assets 4,926 6,103
Total Fair Value [Member] | Interest Rate Swap [Member]
   
Assets    
Interest rate derivative assets   712
Liabilities    
Interest rate derivative liabilities 690  
Total Fair Value [Member] | 2015 Notes Hedges [Member]
   
Assets    
2015 notes hedges 86,640 107,041
Total Fair Value [Member] | 2015 Notes Embedded Conversion Derivative [Member]
   
Liabilities    
2015 notes embedded conversion derivative 86,640 107,041
Total Fair Value [Member] | Equity Securities, Available For Sale [Member]
   
Assets    
Available for sale securities 7,767 7,778
Total Fair Value [Member] | United States Government Full Faith and Credit [Member] | Fixed Maturity Securities [Member]
   
Assets    
Available for sale securities 43,300 42,925
Total Fair Value [Member] | United States Government Sponsored Agencies [Member] | Fixed Maturity Securities [Member]
   
Assets    
Available for sale securities 1,299,454 1,194,289
Total Fair Value [Member] | United States Municipalities, States and Territories [Member] | Fixed Maturity Securities [Member]
   
Assets    
Available for sale securities 3,437,313 3,306,743
Total Fair Value [Member] | Foreign Government Obligations [Member] | Fixed Maturity Securities [Member]
   
Assets    
Available for sale securities 144,023 91,557
Total Fair Value [Member] | Corporate Securities [Member] | Fixed Maturity Securities [Member]
   
Assets    
Available for sale securities 18,441,187 17,233,037
Total Fair Value [Member] | Residential Mortgage Backed Securities [Member] | Fixed Maturity Securities [Member]
   
Assets    
Available for sale securities 1,928,555 1,971,960
Total Fair Value [Member] | Commercial Mortgage Backed Securities [Member] | Fixed Maturity Securities [Member]
   
Assets    
Available for sale securities 1,976,589 1,735,460
Total Fair Value [Member] | Other Asset Backed Securities [Member] | Fixed Maturity Securities [Member]
   
Assets    
Available for sale securities 1,045,052 1,034,476
Quoted Prices in Active Markets (Level 1) [Member]
   
Assets    
Derivative assets 0 0
Cash and cash equivalents 679,172 897,529
Counterparty collateral 0 0
Assets 684,419 902,713
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 Conversion 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 0
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 4,841 4,805
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 37 20
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 369 359
Significant Other Observable Inputs (Level 2) [Member]
   
Assets    
Derivative assets 790,396 856,050
Cash and cash equivalents 0 0
Counterparty collateral 275,558 315,824
Assets 29,474,433 27,897,395
Liabilities    
Fixed index annuities - embedded derivatives 0 0
Liabilities 87,330 107,041
Significant Other Observable Inputs (Level 2) [Member] | Interest Rate Caps [Member]
   
Assets    
Interest rate derivative assets 4,926 6,103
Significant Other Observable Inputs (Level 2) [Member] | Interest Rate Swap [Member]
   
Assets    
Interest rate derivative assets   712
Liabilities    
Interest rate derivative liabilities 690  
Significant Other Observable Inputs (Level 2) [Member] | 2015 Notes Hedges [Member]
   
Assets    
2015 notes hedges 86,640 107,041
Significant Other Observable Inputs (Level 2) [Member] | 2015 Notes Embedded Conversion Derivative [Member]
   
Liabilities    
2015 notes embedded conversion derivative 86,640 107,041
Significant Other Observable Inputs (Level 2) [Member] | Equity Securities, Available For Sale [Member]
   
Assets    
Available for sale securities 7,767 7,778
Significant Other Observable Inputs (Level 2) [Member] | United States Government Full Faith and Credit [Member] | Fixed Maturity Securities [Member]
   
Assets    
Available for sale securities 38,459 38,120
Significant Other Observable Inputs (Level 2) [Member] | United States Government Sponsored Agencies [Member] | Fixed Maturity Securities [Member]
   
Assets    
Available for sale securities 1,299,454 1,194,289
Significant Other Observable Inputs (Level 2) [Member] | United States Municipalities, States and Territories [Member] | Fixed Maturity Securities [Member]
   
Assets    
Available for sale securities 3,437,313 3,306,743
Significant Other Observable Inputs (Level 2) [Member] | Foreign Government Obligations [Member] | Fixed Maturity Securities [Member]
   
Assets    
Available for sale securities 144,023 91,557
Significant Other Observable Inputs (Level 2) [Member] | Corporate Securities [Member] | Fixed Maturity Securities [Member]
   
Assets    
Available for sale securities 18,441,150 17,233,017
Significant Other Observable Inputs (Level 2) [Member] | Residential Mortgage Backed Securities [Member] | Fixed Maturity Securities [Member]
   
Assets    
Available for sale securities 1,927,475 1,970,584
Significant Other Observable Inputs (Level 2) [Member] | Commercial Mortgage Backed Securities [Member] | Fixed Maturity Securities [Member]
   
Assets    
Available for sale securities 1,976,589 1,735,460
Significant Other Observable Inputs (Level 2) [Member] | Other Asset Backed Securities [Member] | Fixed Maturity Securities [Member]
   
Assets    
Available for sale securities 1,044,683 1,034,117
Significant Unobservable Inputs (Level 3) [Member]
   
Assets    
Derivative assets 0 0
Cash and cash equivalents 0 0
Counterparty collateral 0 0
Assets 1,080 1,376
Liabilities    
Fixed index annuities - embedded derivatives 4,755,913 4,406,163
Liabilities 4,755,913 4,406,163
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 Conversion 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 1,080 1,376
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