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Net income per ordinary share - Reconciliation of Net Income Attributable to the Group and Net Income Attributable To the Group (Including NCI Redemption Amount) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Earnings Per Share [Abstract]        
Net income attributable to the Group $ 73,865 $ 47,760 $ 170,987 $ 139,456
Noncontrolling interest adjustment to redemption amount 0 0 0 (4,522)
Net income attributable to the Group (including NCI redemption adjustment) $ 73,865 $ 47,760 $ 170,987 $ 134,934
Net income per Ordinary Share attributable to the Group (including NCI redemption adjustment):        
Basic (USD per share) $ 1.40 $ 0.91 $ 3.23 $ 2.55
Diluted (USD per share) $ 1.38 $ 0.90 $ 3.21 $ 2.51