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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
Mar. 31, 2014
Dec. 31, 2013
Derivatives, Fair Value [Line Items]    
Derivative assets $ 790,396 $ 856,050
Not Designated as Hedging Instrument [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative assets 881,962 969,906
Derivative liabilities 4,843,243 4,513,204
Call Options [Member] | Not Designated as Hedging Instrument [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative assets 790,396 856,050
2015 Notes Hedges [Member] | Not Designated as Hedging Instrument [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative assets 86,640 107,041
Interest Rate Cap [Member] | Not Designated as Hedging Instrument [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative assets 4,926 6,103
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative assets 0 712
Derivative liabilities 690 0
Fixed Index Annuities - Embedded Derivatives [Member] | Not Designated as Hedging Instrument [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative liabilities 4,755,913 4,406,163
2015 Notes Embedded Conversion Derivative [Member] | Not Designated as Hedging Instrument [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative liabilities $ 86,640 $ 107,041