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Income tax and deferred taxes (Details 3) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred tax assets | $ 334,248 | $ 356,560
Deferred Tax Liabilities, Net | 205,283 | 205,455
Unrealized loss [Member] |  |
Deferred tax assets | 0 | 0
Deferred Tax Liabilities, Net | (68,544) | (86,156)
Property, plant and equipment and capitalized interest [Member] |  |
Deferred tax assets | 211,435 | 225,124
Deferred Tax Liabilities, Net | 0 | 0
Facility closure provision [Member] |  |
Deferred tax assets | 0 | 0
Deferred Tax Liabilities, Net | (3,469) | (1,590)
Manufacturing expenses [Member] |  |
Deferred tax assets | 102,748 | 110,630
Deferred Tax Liabilities, Net | 0 | 0
Staff severance indemnities, unemployment insurance [Member] |  |
Deferred tax assets | 6,792 | 5,214
Deferred Tax Liabilities, Net | 0 | 0
Vacation accrual [Member] |  |
Deferred tax assets | 0 | 0
Deferred Tax Liabilities, Net | (4,887) | (4,061)
Inventory provision [Member] |  |
Deferred tax assets | 0 | 0
Deferred Tax Liabilities, Net | (25,098) | (20,608)
Materials provision [Member] |  |
Deferred tax assets | 0 | 0
Deferred Tax Liabilities, Net | (7,107) | (7,776)
Forwards [Member] |  |
Deferred tax assets | 0 | 0
Deferred Tax Liabilities, Net | (624) | (10,206)
Employee benefits [Member] |  |
Deferred tax assets | 0 | 0
Deferred Tax Liabilities, Net | (2,317) | (6,783)
Research and development expenses [Member] |  |
Deferred tax assets | 3,501 | 4,641
Deferred Tax Liabilities, Net | 0 | 0
Accounts Receivable [Member] |  |
Deferred tax assets | 0 | 0
Deferred Tax Liabilities, Net | (4,222) | (4,273)
Provision for legal complaints and expenses [Member] |  |
Deferred tax assets | 0 | 0
Deferred Tax Liabilities, Net | (10,750) | (7,686)
Loan approval expenses [Member] |  |
Deferred tax assets | 2,670 | 3,115
Deferred Tax Liabilities, Net | 0 | 0
Junior mining companies valued based on stock price [Member] |  |
Deferred tax assets | 2,474 | 1,300
Deferred Tax Liabilities, Net | 0 | 0
Royalty [Member] |  |
Deferred tax assets | 4,084 | 6,457
Deferred Tax Liabilities, Net | 0 | 0
Tax loss benefit [Member] |  |
Deferred tax assets | 0 | 0
Deferred Tax Liabilities, Net | (1,437) | (1,302)
Other deferred tax assets [Member] |  |
Deferred tax assets | 544 | 79
Deferred Tax Liabilities, Net | 0 | 0
Foreign items other [Member] |  |
Deferred tax assets | 0 | 0
Deferred Tax Liabilities, Net | $ (510) | $ (664)

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