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Accounting for stock-based compensation (Tables)
6 Months Ended
Jun. 30, 2015
Stock-Based Compensation Expense

Total stock-based compensation expense recognized in the accompanying condensed consolidated statements of operations for the three and six months ended June 30, 2015 and 2014 was as follows (in thousands):

 

     Three months ended June 30,      Six months ended June 30,  
     2015      2014      2015      2014  

Stock-based compensation

   $ 1,775       $ 40,644       $ 3,778       $ 51,583