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Net income per ordinary share (Tables)
 6 Months Ended
Jun. 30, 2021
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
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, 2021June 30, 2020June 30, 2021June 30, 2020
Weighted average number of ordinary shares outstanding for basic net income per ordinary share52,909,368 52,570,104 52,860,414 52,959,229 
Effect of dilutive share options outstanding472,133 458,463 434,021 731,909 
Weighted average number of ordinary shares outstanding for diluted net income per ordinary share53,381,501 53,028,567 53,294,435 53,691,138 
    
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, 2021June 30, 2020June 30, 2021June 30, 2020
(in thousands)(in thousands)
Net income attributable to the Group$73,865 $47,760 $170,987 $139,456 
Noncontrolling interest adjustment to redemption amount— — — (4,522)
Net income attributable to the Group (including NCI redemption adjustment)$73,865 $47,760 $170,987 $134,934 
Three Months EndedSix Months Ended
June 30, 2021June 30, 2020June 30, 2021June 30, 2020
Net income per Ordinary Share attributable to the Group (including NCI redemption adjustment):
Basic$1.40 $0.91 $3.23 $2.55 
Diluted$1.38 $0.90 $3.21 $2.51