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Accounting for stock-based compensation (Tables)
9 Months Ended
Sep. 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 nine months ended September 30, 2013 and 2012 was as follows (in thousands):

 

     Three months  ended
September 30,
     Nine months ended
September 30,
 
     2013      2012      2013      2012  

Stock-based compensation

   $ 15,943       $ 3,820       $ 31,304       $ 9,770