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Salaries and social security expenses - Summary (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Salaries and social security expenses [abstract]      
Wages and salaries $ 127,113 $ 132,010 $ 101,818
Social security costs 41,404 36,932 30,296
Equity-settled share-based compensation 8,581 10,227 6,406
Salaries and social security expenses 177,098 179,169 138,520
Wages and salaries capitalized in property, plant and equipment $ 35,007 $ 30,014 $ 25,105