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Employee benefits - Analysis of net period cost (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Employee benefits      
Current service cost $ 2,187 $ 6,518 $ 425
Interest cost on benefit obligation 1,109 692 127
Net period cost $ 3,296 $ 7,210 $ 552