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Derivative Instruments (Fair Value of Derivative Instruments as Presented in the Consolidated Balance Sheets) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Derivatives, Fair Value [Line Items]    
Derivative assets $ 905,688 $ 856,050
Not Designated as Hedging Instrument [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative assets 955,360 969,906
Derivative liabilities 5,167,690 4,513,204
Call Options [Member] | Not Designated as Hedging Instrument [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative assets 905,688 856,050
2015 Notes Hedges [Member] | Not Designated as Hedging Instrument [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative assets 45,884 107,041
Interest Rate Caps [Member] | Not Designated as Hedging Instrument [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative assets 3,788 6,103
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative assets 0 712
Derivative liabilities 1,983 0
Fixed Index Annuities - Embedded Derivatives [Member] | Not Designated as Hedging Instrument [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative liabilities 5,119,823 4,406,163
2015 Notes Embedded Conversion Derivative [Member] | Not Designated as Hedging Instrument [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative liabilities $ 45,884 $ 107,041