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Derivative Instruments Change in Fair Value of Derivatives Included in the Consolidated Statement of Operations (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net $ 373,962 $ 259,161
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net 363,272 359,066
Call Option [Member]
    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 344,654 241,520
Option on Securities [Member]
    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 28,098 16,751
Interest Rate Swap [Member]
    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 733 890
Interest Rate Cap [Member]
    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 477 0
2015 Notes Embedded Conversion Derivative [Member]
    
Derivative Instruments, Gain (Loss) [Line Items]    
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net (28,098) (16,751)
Fixed Index Annuity Embedded Derivative Financial Instruments [Member]
    
Derivative Instruments, Gain (Loss) [Line Items]    
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net $ (335,174) $ (342,315)