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Accounting for stock-based compensation (Tables)
6 Months Ended
Jun. 30, 2013
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, 2013 and 2012 was as follows (in thousands):

 

     Three months ended
June 30,
     Six months ended
June 30,
 
     2013      2012      2013      2012  

Stock-based compensation

   $ 10,172       $ 3,072       $ 15,362       $ 5,951