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Earnings per share (Details 2)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Earnings per share      
Series A, B and C preferred shares, stock options and restricted stock units excluded from calculation of EPS because they are antidilutive 35,775,468 72,938,266 54,293,266