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Income tax and deferred taxes (Details 4) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Deferred tax assets and liabilities, net opening balance | $ (205,283) | $ 205,455
Deferred tax expense (benefit) recognized in profit (loss) for the year | (27,407) | (440)
Deferred taxes related to items credited (charged) directly to equity | (2,515) | 268
Total increases (decreases) in deferred tax liabilities (assets) | (29,922) | (172)
Deferred tax liability (asset) at end of period | (175,361) | (205,283)
Unrealized loss [Member] |  |
Deferred tax assets and liabilities, net opening balance | (68,544) | (86,156)
Deferred tax expense (benefit) recognized in profit (loss) for the year | (7,288) | 17,612
Deferred taxes related to items credited (charged) directly to equity | 0 | 0
Total increases (decreases) in deferred tax liabilities (assets) | (7,288) | 17,612
Deferred tax liability (asset) at end of period | (75,832) | (68,544)
Property, plant and equipment and capitalized interest [Member] |  |
Deferred tax assets and liabilities, net opening balance | 211,374 | 225,124
Deferred tax expense (benefit) recognized in profit (loss) for the year | (14,531) | (13,750)
Deferred taxes related to items credited (charged) directly to equity | 0 | 0
Total increases (decreases) in deferred tax liabilities (assets) | (14,531) | (13,750)
Deferred tax liability (asset) at end of period | 196,843 | 211,374
Facility closure provision [Member] |  |
Deferred tax assets and liabilities, net opening balance | (3,469) | (1,589)
Deferred tax expense (benefit) recognized in profit (loss) for the year | (811) | (1,880)
Deferred taxes related to items credited (charged) directly to equity | 0 | 0
Total increases (decreases) in deferred tax liabilities (assets) | (811) | (1,880)
Deferred tax liability (asset) at end of period | (4,280) | (3,469)
Manufacturing expenses [Member] |  |
Deferred tax assets and liabilities, net opening balance | 102,748 | 110,630
Deferred tax expense (benefit) recognized in profit (loss) for the year | 1,012 | (7,882)
Deferred taxes related to items credited (charged) directly to equity | 0 | 0
Total increases (decreases) in deferred tax liabilities (assets) | 1,012 | (7,882)
Deferred tax liability (asset) at end of period | 103,760 | 102,748
Staff severance indemnities, unemployment insurance [Member] |  |
Deferred tax assets and liabilities, net opening balance | 6,792 | 5,214
Deferred tax expense (benefit) recognized in profit (loss) for the year | (667) | 1,876
Deferred taxes related to items credited (charged) directly to equity | (446) | (298)
Total increases (decreases) in deferred tax liabilities (assets) | (1,113) | 1,578
Deferred tax liability (asset) at end of period | 5,679 | 6,792
Vacation accrual [Member] |  |
Deferred tax assets and liabilities, net opening balance | (4,887) | (4,061)
Deferred tax expense (benefit) recognized in profit (loss) for the year | (268) | (826)
Deferred taxes related to items credited (charged) directly to equity | 0 | 0
Total increases (decreases) in deferred tax liabilities (assets) | (268) | (826)
Deferred tax liability (asset) at end of period | (5,155) | (4,887)
Inventory provision [Member] |  |
Deferred tax assets and liabilities, net opening balance | (25,172) | (20,684)
Deferred tax expense (benefit) recognized in profit (loss) for the year | (2,983) | (4,488)
Deferred taxes related to items credited (charged) directly to equity | 0 | 0
Total increases (decreases) in deferred tax liabilities (assets) | (2,983) | (4,488)
Deferred tax liability (asset) at end of period | (28,155) | (25,172)
Materials provision [Member] |  |
Deferred tax assets and liabilities, net opening balance | (7,107) | (7,776)
Deferred tax expense (benefit) recognized in profit (loss) for the year | 868 | 669
Deferred taxes related to items credited (charged) directly to equity | 0 | 0
Total increases (decreases) in deferred tax liabilities (assets) | 868 | 669
Deferred tax liability (asset) at end of period | (6,239) | (7,107)
Forwards [Member] |  |
Deferred tax assets and liabilities, net opening balance | (624) | (10,206)
Deferred tax expense (benefit) recognized in profit (loss) for the year | (1,545) | 9,582
Deferred taxes related to items credited (charged) directly to equity | 0 | 0
Total increases (decreases) in deferred tax liabilities (assets) | (1,545) | 9,582
Deferred tax liability (asset) at end of period | (2,169) | (624)
Employee benefits [Member] |  |
Deferred tax assets and liabilities, net opening balance | (2,317) | (6,783)
Deferred tax expense (benefit) recognized in profit (loss) for the year | (992) | 4,466
Deferred taxes related to items credited (charged) directly to equity | 0 | 0
Total increases (decreases) in deferred tax liabilities (assets) | (992) | 4,466
Deferred tax liability (asset) at end of period | (3,309) | (2,317)
Research and development expenses [Member] |  |
Deferred tax assets and liabilities, net opening balance | 3,501 | 4,641
Deferred tax expense (benefit) recognized in profit (loss) for the year | (1,285) | (1,140)
Deferred taxes related to items credited (charged) directly to equity | 0 | 0
Total increases (decreases) in deferred tax liabilities (assets) | (1,285) | (1,140)
Deferred tax liability (asset) at end of period | 2,216 | 3,501
Provision for legal complaints and expenses [Member] |  |
Deferred tax assets and liabilities, net opening balance | (5,243) | (7,686)
Deferred tax expense (benefit) recognized in profit (loss) for the year | 1,230 | 2,443
Deferred taxes related to items credited (charged) directly to equity | 0 | 0
Total increases (decreases) in deferred tax liabilities (assets) | 1,230 | 2,443
Deferred tax liability (asset) at end of period | (4,013) | (5,243)
Loan approval expenses [Member] |  |
Deferred tax assets and liabilities, net opening balance | 2,670 | 3,115
Deferred tax expense (benefit) recognized in profit (loss) for the year | (333) | (445)
Deferred taxes related to items credited (charged) directly to equity | 0 | 0
Total increases (decreases) in deferred tax liabilities (assets) | (333) | (445)
Deferred tax liability (asset) at end of period | 2,337 | 2,670
Junior mining companies valued based on stock price [Member] |  |
Deferred tax assets and liabilities, net opening balance | 2,474 | 1,300
Deferred tax expense (benefit) recognized in profit (loss) for the year | 0 | 624
Deferred taxes related to items credited (charged) directly to equity | (1,498) | 550
Total increases (decreases) in deferred tax liabilities (assets) | (1,498) | 1,174
Deferred tax liability (asset) at end of period | 976 | 2,474
Royalties [Member] |  |
Deferred tax assets and liabilities, net opening balance | 4,084 | 6,457
Deferred tax expense (benefit) recognized in profit (loss) for the year | (795) | (2,389)
Deferred taxes related to items credited (charged) directly to equity | (11) | 16
Total increases (decreases) in deferred tax liabilities (assets) | (806) | (2,373)
Deferred tax liability (asset) at end of period | 3,278 | 4,084
Tax loss benefit [Member] |  |
Deferred tax assets and liabilities, net opening balance | (1,437) | (1,302)
Deferred tax expense (benefit) recognized in profit (loss) for the year | 313 | (135)
Deferred taxes related to items credited (charged) directly to equity | 0 | 0
Total increases (decreases) in deferred tax liabilities (assets) | 313 | (135)
Deferred tax liability (asset) at end of period | (1,124) | (1,437)
Other deferred tax assets [Member] |  |
Deferred tax assets and liabilities, net opening balance | (5,002) | (266)
Deferred tax expense (benefit) recognized in profit (loss) for the year | (64) | (4,736)
Deferred taxes related to items credited (charged) directly to equity | 61 | 0
Total increases (decreases) in deferred tax liabilities (assets) | (3) | (4,736)
Deferred tax liability (asset) at end of period | (5,005) | (5,002)
Foreign items other [Member] |  |
Deferred tax assets and liabilities, net opening balance | (305) | (212)
Deferred tax expense (benefit) recognized in profit (loss) for the year | 46 | (93)
Deferred taxes related to items credited (charged) directly to equity | 0 | 0
Total increases (decreases) in deferred tax liabilities (assets) | 46 | (93)
Deferred tax liability (asset) at end of period | (259) | (305)
Accounts Receivable [Member] |  |
Deferred tax assets and liabilities, net opening balance | (4,253) | (4,305)
Deferred tax expense (benefit) recognized in profit (loss) for the year | 686 | 52
Deferred taxes related to items credited (charged) directly to equity | (621) | 0
Total increases (decreases) in deferred tax liabilities (assets) | 65 | 52
Deferred tax liability (asset) at end of period | $ (4,188) | $ (4,253)

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