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Cash and cash equivalents (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Cash and cash equivalents [abstract]      
Cash $ 401,327 $ 371,057  
Short-term bank deposits 80,000 80,905  
Cash and cash equivalents $ 481,327 $ 451,962 $ 177,742