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Derivative Instruments (Change in Fair Value of Derivative Instruments) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Derivative Instruments, Gain (Loss) [Line Items]      
Change in fair value of derivatives $ 1,076,015 $ 221,138 $ (114,728)
Change in fair value of embedded derivatives 133,968 286,899 (105,194)
Call Options [Member]
      
Derivative Instruments, Gain (Loss) [Line Items]      
Change in fair value of derivatives 932,003 228,610 (93,582)
2015 Notes Hedges [Member]
      
Derivative Instruments, Gain (Loss) [Line Items]      
Change in fair value of derivatives 145,751 (2,488) (21,002)
2015 Warrants [Member]
      
Derivative Instruments, Gain (Loss) [Line Items]      
Change in fair value of derivatives (9,568) 0 0
Interest Rate Swap [Member]
      
Derivative Instruments, Gain (Loss) [Line Items]      
Change in fair value of derivatives 4,973 (4,261) (144)
Interest Rate Caps [Member]
      
Derivative Instruments, Gain (Loss) [Line Items]      
Change in fair value of derivatives 2,856 (723) 0
2015 Notes Embedded Derivative [Member]
      
Derivative Instruments, Gain (Loss) [Line Items]      
Change in fair value of embedded derivatives 141,974 (2,488) (21,002)
Fixed Index Annuities - Embedded Derivatives [Member]
      
Derivative Instruments, Gain (Loss) [Line Items]      
Change in fair value of embedded derivatives $ (8,006) $ 289,387 $ (84,192)