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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, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Derivative Instruments, Gain (Loss) [Line Items]        
Change in fair value of derivatives $ 270,883 $ 64,040 $ 319,376 $ 438,002
Change in fair value of embedded derivatives 80,935 (408,409) 173,554 (45,137)
Call Options [Member]
        
Derivative Instruments, Gain (Loss) [Line Items]        
Change in fair value of derivatives 273,769 58,200 345,242 402,854
2015 Notes Hedges [Member]
        
Derivative Instruments, Gain (Loss) [Line Items]        
Change in fair value of derivatives 100 197 (20,301) 28,295
Interest Rate Swap [Member]
        
Derivative Instruments, Gain (Loss) [Line Items]        
Change in fair value of derivatives (1,848) 3,802 (3,250) 4,535
Interest Rate Caps [Member]
        
Derivative Instruments, Gain (Loss) [Line Items]        
Change in fair value of derivatives (1,138) 1,841 (2,315) 2,318
2015 Notes Embedded Conversion Derivative [Member]
        
Derivative Instruments, Gain (Loss) [Line Items]        
Change in fair value of embedded derivatives (4,132) 197 (24,533) 28,295
Fixed Index Annuities - Embedded Derivatives [Member]
        
Derivative Instruments, Gain (Loss) [Line Items]        
Change in fair value of embedded derivatives $ 85,067 $ (408,606) $ 198,087 $ (73,432)