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Convertible Senior Notes (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Net carrying amount $ 1,308,852 $ 1,292,953
Senior Notes Due 2019 [Member]    
Debt Instrument [Line Items]    
Principal 1,437,500  
Less: note discount (128,648)  
Equity component [1] 162,869  
Level 2 [Member] | Carrying Value [Member] | Senior Notes Due 2019 [Member]    
Debt Instrument [Line Items]    
Net carrying amount $ 1,308,852  
[1] Recorded in the condensed consolidated balance sheet within additional paid-in capital.