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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, 2014
Mar. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items]    
Change in fair value of derivatives $ 48,493 $ 373,962
Change in fair value of embedded derivatives 92,619 363,272
Call Options [Member]
    
Derivative Instruments, Gain (Loss) [Line Items]    
Change in fair value of derivatives 71,473 344,654
2015 Notes Hedges [Member]
    
Derivative Instruments, Gain (Loss) [Line Items]    
Change in fair value of derivatives (20,401) 28,098
Interest Rate Swap [Member]
    
Derivative Instruments, Gain (Loss) [Line Items]    
Change in fair value of derivatives (1,402) 733
Interest Rate Caps [Member]
    
Derivative Instruments, Gain (Loss) [Line Items]    
Change in fair value of derivatives (1,177) 477
2015 Notes Embedded Conversion Derivative [Member]
    
Derivative Instruments, Gain (Loss) [Line Items]    
Change in fair value of embedded derivatives (20,401) 28,098
Fixed Index Annuities - Embedded Derivatives [Member]
    
Derivative Instruments, Gain (Loss) [Line Items]    
Change in fair value of embedded derivatives $ 113,020 $ 335,174