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Prepaid expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Prepaid expenses    
Prepaid energy services(b) $ 24,806 $ 25,692
Prepaid insurance 15,588 15,794
Deferred costs of works for taxes 2,934 4,855
Other prepaid expenses 986 4,174
Prepaid expenses 44,314 50,515
Classification by maturity:    
Current portion 20,394 25,709
Non-current portion 23,920 24,806
Prepaid expenses $ 44,314 $ 50,515