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Cash and cash equivalents - Summary (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash and cash equivalents [abstract]        
Cash at bank and on hand $ 152,721 $ 178,079    
Short-term bank deposits 47,045 158,203    
Cash and cash equivalents $ 199,766 $ 336,282 $ 290,276 $ 273,635