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Net income per ordinary share
 6 Months Ended
Jun. 30, 2020
Earnings Per Share [Abstract]  
Net income per ordinary share Net income per ordinary share
        Basic net income per ordinary share attributable to the Group has been computed by dividing net income available to ordinary shareholders by the weighted average number of ordinary shares outstanding during the period.

        Diluted net income per ordinary share is computed by adjusting the weighted average number of ordinary shares outstanding during the period for all potentially dilutive ordinary shares outstanding during the period and adjusting net income for any changes in income or loss that would result from the conversion of such potential ordinary shares.

        There is no difference in net income used for basic and diluted net income per ordinary share.

         Basic and diluted net income per ordinary share attributable to the Group includes the adjustment to reflect the accretion of the noncontrolling interest in MeDiNova to its redemption value.

         The reconciliation of the number of shares used in the computation of basic and diluted net income per ordinary share is as follows:
Three Months EndedSix Months Ended
June 30, 2020June 30, 2019June 30, 2020June 30, 2019
Weighted average number of ordinary shares outstanding for basic net income per ordinary share52,570,104  53,957,446  52,959,229  53,901,427  
Effect of dilutive share options outstanding458,463  491,671  731,909  454,278  
Weighted average number of ordinary shares outstanding for diluted net income per ordinary share53,028,567  54,449,117  53,691,138  54,355,705  
        The reconciliation of net income attributable to the Group and net income attributable to the group (including NCI redemption amount) as used to calculate net income per ordinary share attributable to the Group is as follows:

Three Months EndedSix Months Ended
June 30, 2020June 30, 2019June 30, 2020June 30, 2019
(in thousands)(in thousands)
Net income attributable to the Group$47,760  $91,857  $139,456  $180,154  
Noncontrolling interest adjustment to redemption amount—  —  (4,522) —  
Net income attributable to the Group (including NCI redemption adjustment)$47,760  $91,857  $134,934  $180,154  
Three Months EndedSix Months Ended
June 30, 2020June 30, 2019June 30, 2020June 30, 2019
Net income per Ordinary Share attributable to the Group (including NCI redemption adjustment):
Basic$0.91  $1.70  $2.55  $3.34  
Diluted$0.90  $1.69  $2.51  $3.31