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Inventories - Impairment of value of inventory (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Inventories.      
Beginning Balance $ 29,842 $ 30,774 $ 31,117
Provision for finished and in progress goods, note 21(a) (10,536) (7,243) (6,877)
Reversal for finished and in progress goods, note 21(a) (6,685) (8,314) (12,348)
Total of provision (reversal) for finished and in progress goods 3,851 (1,071) (5,471)
Provision for spare parts and supplies, note 28(a) 20,478 22,533 22,394
Reversal for spare parts and supplies, note 28(a) (19,409) (22,394) (17,266)
Provision (reversal) for impairment of spare parts and supplies 1,069 139 5,128
Final balance $ 34,762 $ 29,842 $ 30,774