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Accounting for stock-based compensation (Tables)
6 Months Ended
Jun. 30, 2014
Stock-Based Compensation Expense Recognized in Condensed Consolidated Statements of Operations

Total stock-based compensation expense recognized in the accompanying condensed consolidated statements of operations for the three and six months ended June 30, 2014 and 2013 was as follows (in thousands):

 

     Three months ended
June 30,
     Six months ended
June 30,
 
     2014      2013      2014      2013  

Stock-based compensation

   $ 40,644       $ 10,172       $ 51,583       $ 15,362