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Income tax and deferred taxes (Details 4) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Statement [Line Items] |  |
Deferred tax assets and liabilities, net opening balance | $ 183,411 | $ 175,361
Deferred tax expense (benefit) recognized in profit (loss) for the year | (29,096) | 5,758
Deferred taxes related to items credited (charged) directly to equity | 1,786 | 2,292
Total increases (decreases) in deferred tax liabilities (assets) | (27,310) | 8,050
Deferred tax liability (asset) at end of period | 156,101 | 183,411
Unrealized loss [Member] |  |
Statement [Line Items] |  |
Deferred tax assets and liabilities, net opening balance | (82,075) | (75,832)
Deferred tax expense (benefit) recognized in profit (loss) for the year | (8,509) | (6,243)
Deferred taxes related to items credited (charged) directly to equity | 0 | 0
Total increases (decreases) in deferred tax liabilities (assets) | (8,509) | (6,243)
Deferred tax liability (asset) at end of period | (90,585) | (82,075)
Property, plant and equipment and capitalized interest [Member] |  |
Statement [Line Items] |  |
Deferred tax assets and liabilities, net opening balance | 197,167 | 196,843
Deferred tax expense (benefit) recognized in profit (loss) for the year | (9,999) | 324
Deferred taxes related to items credited (charged) directly to equity | 0 | 0
Total increases (decreases) in deferred tax liabilities (assets) | (9,999) | 324
Deferred tax liability (asset) at end of period | 187,168 | 197,167
Facility closure provision [Member] |  |
Statement [Line Items] |  |
Deferred tax assets and liabilities, net opening balance | (7,313) | (4,280)
Deferred tax expense (benefit) recognized in profit (loss) for the year | 714 | (3,033)
Deferred taxes related to items credited (charged) directly to equity | 0 | 0
Total increases (decreases) in deferred tax liabilities (assets) | 714 | (3,033)
Deferred tax liability (asset) at end of period | (6,598) | (7,313)
Manufacturing expenses [Member] |  |
Statement [Line Items] |  |
Deferred tax assets and liabilities, net opening balance | 106,420 | 103,760
Deferred tax expense (benefit) recognized in profit (loss) for the year | 795 | 2,660
Deferred taxes related to items credited (charged) directly to equity | 0 | 0
Total increases (decreases) in deferred tax liabilities (assets) | 795 | 2,660
Deferred tax liability (asset) at end of period | 107,215 | 106,420
Staff severance indemnities, unemployment insurance [Member] |  |
Statement [Line Items] |  |
Deferred tax assets and liabilities, net opening balance | 6,000 | 5,679
Deferred tax expense (benefit) recognized in profit (loss) for the year | 514 | 1,007
Deferred taxes related to items credited (charged) directly to equity | 155 | (686)
Total increases (decreases) in deferred tax liabilities (assets) | 669 | 321
Deferred tax liability (asset) at end of period | 6,669 | 6,000
Vacation accrual [Member] |  |
Statement [Line Items] |  |
Deferred tax assets and liabilities, net opening balance | (5,591) | (5,155)
Deferred tax expense (benefit) recognized in profit (loss) for the year | (547) | (436)
Deferred taxes related to items credited (charged) directly to equity | 0 | 0
Total increases (decreases) in deferred tax liabilities (assets) | (547) | (436)
Deferred tax liability (asset) at end of period | (6,138) | (5,591)
Inventory provision [Member] |  |
Statement [Line Items] |  |
Deferred tax assets and liabilities, net opening balance | (23,885) | (28,155)
Deferred tax expense (benefit) recognized in profit (loss) for the year | 1,685 | 4,270
Deferred taxes related to items credited (charged) directly to equity | 0 | 0
Total increases (decreases) in deferred tax liabilities (assets) | 1,685 | 4,270
Deferred tax liability (asset) at end of period | (22,200) | (23,885)
Materials provision [Member] |  |
Statement [Line Items] |  |
Deferred tax assets and liabilities, net opening balance | (7,982) | (6,239)
Deferred tax expense (benefit) recognized in profit (loss) for the year | (830) | (1,743)
Deferred taxes related to items credited (charged) directly to equity | 0 | 0
Total increases (decreases) in deferred tax liabilities (assets) | (830) | (1,743)
Deferred tax liability (asset) at end of period | (8,812) | (7,982)
Forwards [Member] |  |
Statement [Line Items] |  |
Deferred tax assets and liabilities, net opening balance | 0 | (2,169)
Deferred tax expense (benefit) recognized in profit (loss) for the year | 1,001 | (514)
Deferred taxes related to items credited (charged) directly to equity | (1,001) | 2,683
Total increases (decreases) in deferred tax liabilities (assets) | 0 | 2,169
Deferred tax liability (asset) at end of period | 0 | 0
Employee benefits [Member] |  |
Statement [Line Items] |  |
Deferred tax assets and liabilities, net opening balance | (2,689) | (3,309)
Deferred tax expense (benefit) recognized in profit (loss) for the year | 2,689 | 620
Deferred taxes related to items credited (charged) directly to equity | 0 | 0
Total increases (decreases) in deferred tax liabilities (assets) | 2,689 | 620
Deferred tax liability (asset) at end of period | 0 | (2,689)
Research and development expenses [Member] |  |
Statement [Line Items] |  |
Deferred tax assets and liabilities, net opening balance | 3,533 | 2,216
Deferred tax expense (benefit) recognized in profit (loss) for the year | 46 | 1,317
Deferred taxes related to items credited (charged) directly to equity | 0 | 0
Total increases (decreases) in deferred tax liabilities (assets) | 46 | 1,317
Deferred tax liability (asset) at end of period | 3,580 | 3,533
bad debt provision [Member] |  |
Statement [Line Items] |  |
Deferred tax assets and liabilities, net opening balance | (3,542) | (4,188)
Deferred tax expense (benefit) recognized in profit (loss) for the year | (1,530) | 646
Deferred taxes related to items credited (charged) directly to equity | 0 | 0
Total increases (decreases) in deferred tax liabilities (assets) | (1,530) | 646
Deferred tax liability (asset) at end of period | (5,072) | (3,542)
Provision for legal complaints and expenses [Member] |  |
Statement [Line Items] |  |
Deferred tax assets and liabilities, net opening balance | (2,546) | (4,013)
Deferred tax expense (benefit) recognized in profit (loss) for the year | (17,091) | 1,467
Deferred taxes related to items credited (charged) directly to equity | 0 | 0
Total increases (decreases) in deferred tax liabilities (assets) | (17,091) | 1,467
Deferred tax liability (asset) at end of period | (19,637) | (2,546)
Loan approval expenses [Member] |  |
Statement [Line Items] |  |
Deferred tax assets and liabilities, net opening balance | 3,856 | 2,337
Deferred tax expense (benefit) recognized in profit (loss) for the year | 1,356 | 1,519
Deferred taxes related to items credited (charged) directly to equity | 0 | 0
Total increases (decreases) in deferred tax liabilities (assets) | 1,356 | 1,519
Deferred tax liability (asset) at end of period | 5,212 | 3,856
Junior mining companies valued based on stock price [Member] |  |
Statement [Line Items] |  |
Deferred tax assets and liabilities, net opening balance | 1,287 | 976
Deferred tax expense (benefit) recognized in profit (loss) for the year | 0 | 0
Deferred taxes related to items credited (charged) directly to equity | 2,642 | 311
Total increases (decreases) in deferred tax liabilities (assets) | 2,642 | 311
Deferred tax liability (asset) at end of period | 3,929 | 1,287
Royalties [Member] |  |
Statement [Line Items] |  |
Deferred tax assets and liabilities, net opening balance | 1,357 | 3,278
Deferred tax expense (benefit) recognized in profit (loss) for the year | 1,668 | (1,905)
Deferred taxes related to items credited (charged) directly to equity | (10) | (16)
Total increases (decreases) in deferred tax liabilities (assets) | 1,658 | (1,921)
Deferred tax liability (asset) at end of period | 3,014 | 1,357
Tax loss benefit [Member] |  |
Statement [Line Items] |  |
Deferred tax assets and liabilities, net opening balance | (2,296) | (1,124)
Deferred tax expense (benefit) recognized in profit (loss) for the year | 1,452 | (1,172)
Deferred taxes related to items credited (charged) directly to equity | 0 | 0
Total increases (decreases) in deferred tax liabilities (assets) | 1,452 | (1,172)
Deferred tax liability (asset) at end of period | (844) | (2,296)
Other deferred tax assets [Member] |  |
Statement [Line Items] |  |
Deferred tax assets and liabilities, net opening balance | 2,021 | (5,005)
Deferred tax expense (benefit) recognized in profit (loss) for the year | (3,475) | 7,026
Deferred taxes related to items credited (charged) directly to equity | 0 | 0
Total increases (decreases) in deferred tax liabilities (assets) | (3,475) | 7,026
Deferred tax liability (asset) at end of period | (1,454) | 2,021
Foreign items other [Member] |  |
Statement [Line Items] |  |
Deferred tax assets and liabilities, net opening balance | (311) | (259)
Deferred tax expense (benefit) recognized in profit (loss) for the year | 965 | (52)
Deferred taxes related to items credited (charged) directly to equity | 0 | 0
Total increases (decreases) in deferred tax liabilities (assets) | 965 | (52)
Deferred tax liability (asset) at end of period | $ 654 | $ (311)

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