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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 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net $ 64,040 $ (150,847) $ 438,002 $ 108,314
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net (408,409) (80,989) (45,137) 278,077
Call Option [Member]
        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 58,200 (122,241) 402,854 119,279
Option on Securities [Member]
        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 197 (24,163) 28,295 (7,412)
Interest Rate Swap [Member]
        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 3,802 (4,038) 4,535 (3,148)
Interest Rate Cap [Member]
        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 1,841 (405) 2,318 (405)
2015 Notes Embedded Conversion Derivative [Member]
        
Derivative Instruments, Gain (Loss) [Line Items]        
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net (197) 24,163 (28,295) 7,412
Fixed Index Annuity Embedded Derivative Financial Instruments [Member]
        
Derivative Instruments, Gain (Loss) [Line Items]        
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net $ 408,606 $ 56,826 $ 73,432 $ (285,489)