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Cost of sales (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of cost of sales [Line Items] |  |  |  |
Depreciation and amortization |  | $ 241,286 | $ 213,722 | $ 192,647
Third parties services |  | (4,318) | (12,954) | (10,754)
Other costs |  | 13,595 | 15,028 | 24,107,000
Cost of sales |  | 982,957 | 980,254 | 824,973
Sociedad Minera Cerro Verde S.A.A. [Member] |  |  |  |
Disclosure of cost of sales [Line Items] |  |  |  |
Materials and supplies |  | 693,316 | 556,022 | 496,918
Depreciation and amortization |  | 0 | 0 | 0
Labor (a) | [1] | 357,692 | 286,058 | 215,839
Energy |  | 254,243 | 229,272 | 229,035
Third parties services |  | 0 | 0 | 0
Change in work in process inventory |  | (8,513) | 51,412 | (3,789)
Management Fees |  | 2,743 | 2,867 | 2,793
Change in finished goods inventory |  | (5,723) | 2,060 | (3,951)
Other costs |  | 45,402 | 39,251 | 42,301
Cost of sales |  | $ 2,216,663 | $ 1,768,238 | $ 1,553,040
[1] | Labor includes an expense of US$60.2 million related to profit sharing for the year ended December 31, 2018 (US$86.4 million for the year ended December 31, 2017). Additionally, it includes an expense of US$69.0 million related to the Union Agreement bonus payment obtained by workers as part of the new collective labor agreement, which is effective from September 1, 2018, through August 31, 2021

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