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Net sales (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure Of Net Sales [Line Items] |  |  |
Revenue from sale of goods | $ 1,223,942 | $ 1,015,670 | $ 846,269
Revenue from rendering of services | 29,697 | 28,782 | 50,839
Revenue arising from rendering of services, sale of goods | 1,253,639 | 1,044,452 | 897,108
Gold | 511,434 | 440,603 | 419,541
Silver | 409,775 | 385,989 | 313,418
Copper | 268,527 | 224,649 | 131,356
Zinc | 188,023 | 142,425 | 102,110
Lead | 94,955 | 58,690 | 55,445
Manganese sulfate | 6,317 | 5,982 | 3,649
Revenue from sale of goods before commercial deductions | 1,479,097 | 1,258,338 | 1,025,519
Commercial deductions | (253,939) | (244,414) | (196,145)
Adjustments to prior period liquidations | 919 | 4,611 | 7,467
Embedded derivatives from sale of concentrate | 8,786 | 880 | (388)
Hedge operations | (10,921) | (3,745) | 9,816
Indium | 66 | 0 | 0
America [Member] |  |  |
Disclosure Of Net Sales [Line Items] |  |  |
Revenue from sale of goods | 464,000 | 410,154 | 419,359
Revenue from rendering of services | 14,794 | 0 | 0
Peru [Member] |  |  |
Disclosure Of Net Sales [Line Items] |  |  |
Revenue from sale of goods | 591,185 | 401,372 | 345,146
Revenue from rendering of services | 14,903 | 28,782 | 50,839
Europe [Member] |  |  |
Disclosure Of Net Sales [Line Items] |  |  |
Revenue from sale of goods | 91,414 | 109,788 | 60,549
Asia [Member] |  |  |
Disclosure Of Net Sales [Line Items] |  |  |
Revenue from sale of goods | $ 77,343 | $ 94,356 | $ 21,215

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