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Borrowing costs (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Borrowing costs [abstract]    
Capitalization rate of costs for capitalized interest, property, plant and equipment 4.00% 4.00%
Amount of costs for interest capitalized in ThUS$ $ 7,841 $ 5,021