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Income taxes (Tables)
9 Months Ended
Sep. 30, 2015
Income taxes [Abstract]  
Schedule of net (benefit) provision for income taxes
    Three Months Ended     Nine Months Ended  
    September 30,     September 30,  
    2015     2014     2015     2014  
(Benefit) Provision for income taxes   $ 6,964     $ (44,938 )   $ 49,922     $ 88,290