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Cost of sales, without considering depreciation and amortization - Cost of sales of goods (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Cost of production |  |  |  |
Cost of sales, excluding depreciation and amortization | $ 393,888 | $ 512,874 | $ 613,381 |
cost of sales of products [Member] |  |  |  |
Disclosure of cost of sales [Line Items] |  |  |  |
Beginning balance of finished goods and products in process, net of depreciation and amortization |  | 31,938 | 49,206 | $ 37,640
Cost of production |  |  |  |
Services provided by third parties | 143,652 | 196,895 | 243,410 |
Consumption of materials and supplies | 70,942 | 96,351 | 133,961 |
Disbursement of salaries | 62,885 | 79,076 | 93,122 |
Electricity and water | 36,504 | 44,583 | 50,215 |
Maintenance and repair | 22,235 | 19,729 | 24,415 |
Short-term and low-value lease | 16,289 | 20,784 | 23,539 |
Transport | 12,234 | 16,341 | 30,819 |
Insurances | 12,036 | 12,235 | 11,311 |
Provision (reversal) for impairment of finished goods and product in progress, note 8(c) | 5,054 | (2,143) | 4,521 |
Other production expenses | 11,916 | 11,755 | 9,634 |
Total cost of production of the period | 393,747 | 495,606 | 624,947 |
Final balance of products in process and finished goods, net of depreciation and amortization | $ (31,797) | $ (31,938) | $ (49,206) |

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- Definition The amount of costs relating to expenses directly or indirectly attributed to the goods or services sold, which may include, but are not limited to, costs previously included in the measurement of inventory that has now been sold, unallocated production overheads and abnormal amounts of production costs of inventories excluding depreciation and amortization. + References No definition available. + Details
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