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Exploration in operating units (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure Of Exploration In Operating Units [Line Items] |  |  |
Expense arising from exploration for and evaluation of Operating units | $ 94,928 | $ 96,149 | $ 89,699
Services provided by third parties |  |  |
Disclosure Of Exploration In Operating Units [Line Items] |  |  |
Expense arising from exploration for and evaluation of Operating units | 79,837 | 78,996 | 72,613
Consumption of materials and supplies |  |  |
Disclosure Of Exploration In Operating Units [Line Items] |  |  |
Expense arising from exploration for and evaluation of Operating units | 8,236 | 12,779 | 10,298
Direct labor |  |  |
Disclosure Of Exploration In Operating Units [Line Items] |  |  |
Expense arising from exploration for and evaluation of Operating units | 2,373 | 1,989 | 2,287
Rentals |  |  |
Disclosure Of Exploration In Operating Units [Line Items] |  |  |
Expense arising from exploration for and evaluation of Operating units | 1,527 | 1,603 | 859
Electricity and water |  |  |
Disclosure Of Exploration In Operating Units [Line Items] |  |  |
Expense arising from exploration for and evaluation of Operating units | 1,328 | 21 | 7
Transport |  |  |
Disclosure Of Exploration In Operating Units [Line Items] |  |  |
Expense arising from exploration for and evaluation of Operating units | 587 | 321 | 238
Maintenance and repair |  |  |
Disclosure Of Exploration In Operating Units [Line Items] |  |  |
Expense arising from exploration for and evaluation of Operating units | 100 | 62 | 30
Insurance |  |  |
Disclosure Of Exploration In Operating Units [Line Items] |  |  |
Expense arising from exploration for and evaluation of Operating units | 0 | 116 | 135
Other minor expenses |  |  |
Disclosure Of Exploration In Operating Units [Line Items] |  |  |
Expense arising from exploration for and evaluation of Operating units | $ 940 | $ 262 | $ 3,232

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