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Sales of goods (Details 1) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of Sales of goods [Line Items] |  |  |
Revenue from sale of goods before deducting royalty expense | $ 3,211,266 | $ 2,390,840 | $ 1,119,370
Royalty Expense | (31,217) | (27,611) | 27,188
Revenue from sale of goods | 1,223,942 | 1,015,670 | 846,269
North Americ [Member] |  |  |
Disclosure of Sales of goods [Line Items] |  |  |
Revenue from sale of goods before deducting royalty expense | 287,174 | 213,002 | 79,244
South America primarily Peru [Member] |  |  |
Disclosure of Sales of goods [Line Items] |  |  |
Revenue from sale of goods before deducting royalty expense | 193,174 | 150,648 | 204,206
Asia [Member] |  |  |
Disclosure of Sales of goods [Line Items] |  |  |
Revenue from sale of goods before deducting royalty expense | 2,416,826 | 1,865,346 | 770,272
Revenue from sale of goods | 77,343 | 94,356 | 21,215
Europe [Member] |  |  |
Disclosure of Sales of goods [Line Items] |  |  |
Revenue from sale of goods before deducting royalty expense | 314,092 | 161,844 | 65,648
Revenue from sale of goods | $ 91,414 | $ 109,788 | $ 60,549

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