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Financial - risk management objectives and policies - Financial Position (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Financial - risk management objectives and policies        
Leases $ 10,320 $ 12,953    
Less: cash and short-term deposits $ (219,790) $ (253,918) $ (376,999) $ (235,449)