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Convertible Senior Notes (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Net carrying amount $ 1,324,992 $ 1,292,953
Senior Notes Due 2019    
Debt Instrument [Line Items]    
Principal 1,437,500  
Less: note discount (112,508)  
Net carrying amount 1,324,992  
Equity component [1] $ 162,869  
[1] Recorded in the consolidated balance sheet within additional paid-in capital.