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v3.20.1

Income tax and deferred taxes (Details 3) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Statement [Line Items] |  |  |
Deferred tax assets | $ 138,230 | $ 139,728 |
Deferred Tax Liabilities, Net | (183,411) | (175,361) |
Deferred tax liability (asset) | (183,411) | 175,361 | $ (205,283)
Unrealized loss [Member] |  |  |
Statement [Line Items] |  |  |
Deferred tax assets | 82,075 | 75,832 |
Deferred Tax Liabilities, Net | 0 | 0 |
Deferred tax liability (asset) | (82,075) | (75,832) | (68,544)
Property, plant and equipment and capitalized interest [Member] |  |  |
Statement [Line Items] |  |  |
Deferred tax assets | 0 | 0 |
Deferred Tax Liabilities, Net | (197,167) | (196,843) |
Deferred tax liability (asset) | 197,167 | 196,843 | 211,374
Facility closure provision [Member] |  |  |
Statement [Line Items] |  |  |
Deferred tax assets | 7,313 | 4,280 |
Deferred Tax Liabilities, Net | 0 | 0 |
Deferred tax liability (asset) | (7,313) | (4,280) | (3,469)
Manufacturing expenses [Member] |  |  |
Statement [Line Items] |  |  |
Deferred tax assets | 0 | 0 |
Deferred Tax Liabilities, Net | (106,420) | (103,760) |
Deferred tax liability (asset) | 106,420 | 103,760 | 102,748
Staff severance indemnities, unemployment insurance [Member] |  |  |
Statement [Line Items] |  |  |
Deferred tax assets | 0 | 0 |
Deferred Tax Liabilities, Net | (6,000) | (5,679) |
Deferred tax liability (asset) | 6,000 | 5,679 | 6,792
Vacation accrual [Member] |  |  |
Statement [Line Items] |  |  |
Deferred tax assets | 5,591 | 5,155 |
Deferred Tax Liabilities, Net | 0 | 0 |
Deferred tax liability (asset) | (5,591) | (5,155) | (4,887)
Inventory provision [Member] |  |  |
Statement [Line Items] |  |  |
Deferred tax assets | 23,885 | 28,155 |
Deferred Tax Liabilities, Net | 0 | 0 |
Deferred tax liability (asset) | (23,885) | (28,155) | (25,172)
Materials provision [Member] |  |  |
Statement [Line Items] |  |  |
Deferred tax assets | 7,982 | 6,239 |
Deferred Tax Liabilities, Net | 0 | 0 |
Deferred tax liability (asset) | (7,982) | (6,239) | (7,107)
Forwards [Member] |  |  |
Statement [Line Items] |  |  |
Deferred tax assets | 0 | 2,169 |
Deferred Tax Liabilities, Net | 0 | 0 |
Deferred tax liability (asset) | 0 | (2,169) | (624)
Employee benefits [Member] |  |  |
Statement [Line Items] |  |  |
Deferred tax assets | 2,689 | 3,309 |
Deferred Tax Liabilities, Net | 0 | 0 |
Deferred tax liability (asset) | (2,689) | (3,309) | (2,317)
Research and development expenses [Member] |  |  |
Statement [Line Items] |  |  |
Deferred tax assets | 0 | 0 |
Deferred Tax Liabilities, Net | (3,533) | (2,216) |
Deferred tax liability (asset) | 3,533 | 2,216 | 3,501
Accounts Receivable [Member] |  |  |
Statement [Line Items] |  |  |
Deferred tax assets | 3,542 | 4,188 |
Deferred Tax Liabilities, Net | 0 | 0 |
Deferred tax liability (asset) | (3,542) | (4,188) | (4,253)
Provision for legal complaints and expenses [Member] |  |  |
Statement [Line Items] |  |  |
Deferred tax assets | 2,546 | 4,013 |
Deferred Tax Liabilities, Net | 0 | 0 |
Deferred tax liability (asset) | (2,546) | (4,013) | (5,243)
Loan approval expenses [Member] |  |  |
Statement [Line Items] |  |  |
Deferred tax assets | 0 | 0 |
Deferred Tax Liabilities, Net | (3,856) | (2,337) |
Deferred tax liability (asset) | 3,856 | 2,337 | 2,670
Junior mining companies valued based on stock price [Member] |  |  |
Statement [Line Items] |  |  |
Deferred tax assets | 0 | 0 |
Deferred Tax Liabilities, Net | (1,287) | (976) |
Deferred tax liability (asset) | 1,287 | 976 | 2,474
Royality [Member] |  |  |
Statement [Line Items] |  |  |
Deferred tax assets | 0 | 0 |
Deferred Tax Liabilities, Net | (1,357) | (3,278) |
Deferred tax liability (asset) | 1,357 | 3,278 | 4,084
Tax loss benefit [Member] |  |  |
Statement [Line Items] |  |  |
Deferred tax assets | 2,296 | 1,124 |
Deferred Tax Liabilities, Net | 0 | 0 |
Deferred tax liability (asset) | (2,296) | (1,124) | (1,437)
Other deferred tax assets [Member] |  |  |
Statement [Line Items] |  |  |
Deferred tax assets | 0 | 5,005 |
Deferred Tax Liabilities, Net | (2,021) | 0 |
Deferred tax liability (asset) | 2,021 | (5,005) | (5,002)
Foreign items other [Member] |  |  |
Statement [Line Items] |  |  |
Deferred tax assets | 311 | 259 |
Deferred Tax Liabilities, Net | 0 | 0 |
Deferred tax liability (asset) | $ (311) | $ (259) | $ (305)

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