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Prepaid expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Prepaid expenses    
Right to use facilities paid in advance $ 23,920 $ 24,806
Prepaid insurance 15,065 15,588
Deferred costs of works for taxes 1,929 2,934
Other prepaid expenses 1,452 986
Prepaid expenses 42,366 44,314
Classification by maturity:    
Current portion 19,333 20,394
Non-current portion 23,033 23,920
Prepaid expenses $ 42,366 $ 44,314