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Prepaid expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Prepaid expenses    
Prepaid energy services $ 26,582 $ 27,464
Prepaid insurances 13,568 12,486
Deferred costs of works for taxes 4,138 2,407
Other prepaid expenses 2,373 1,366
Prepayments 46,661 43,723
Classification by maturity:    
Current portion 20,969 17,145
Non-current portion 25,692 26,578
Prepayments $ 46,661 $ 43,723