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Cash and cash equivalents - Summary (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Cash and cash equivalents [abstract]        
Cash at bank and on hand $ 146,242 $ 152,721    
Short-term bank deposits 84,411 47,045    
Cash and cash equivalents $ 230,653 $ 199,766 $ 336,282 $ 290,276