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Convertible Senior Notes (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Net carrying amount $ 1,285,092 $ 0
Senior Notes Due 2019 [Member]
   
Debt Instrument [Line Items]    
Principal 1,437,500  
Less: note discount (152,408)  
Equity component 162,872 [1]  
Level 2 [Member] | Carrying Value [Member] | Senior Notes Due 2019 [Member]
   
Debt Instrument [Line Items]    
Net carrying amount $ 1,285,092  
[1] Recorded in the condensed consolidated balance sheet within additional paid-in capital.