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Employee benefits - Analysis of net period cost (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Employee benefits      
Current service cost $ 6,518 $ 425 $ 398
Interest cost on benefit obligation 692 127 123
Net period cost $ 7,210 $ 552 $ 521