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Financial instruments and financial risk management - Fair value (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Level 1    
Financial instruments and financial risk management    
Non-current financial assets $ 10,293 $ 15,528
Cash and cash equivalents 1,307,197 1,678,100
Assets carried at fair value 1,317,490 1,693,628
Level 3    
Financial instruments and financial risk management    
Non-current financial assets 21,715 21,715
Assets carried at fair value $ 21,715 $ 21,715