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Debt (4.0% Convertible Senior Notes due 2014 - Carrying Value Of Debt) (Details) (USD $)
Sep. 30, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Principal Balance $ 7,559,568,000 $ 5,910,041,000
Carrying Value 7,550,088,000 5,876,607,000
4.0% Convertible Senior Notes [Member]
   
Debt Instrument [Line Items]    
Principal Balance 367,068,000 499,944,000
Carrying Value $ 367,068,000 $ 468,394,000