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Income tax and deferred taxes (Details 4) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Deferred tax liability (asset) at beginning of period | $ 205,455 | $ 219,230
Deferred tax expense (income) recognised in profit or loss | (440) | (14,624)
Deferred tax relating to items credited (charged) directly to equity | 268 | 849
Increase (decrease) in deferred tax liability (asset) | (172) | (13,775)
Deferred tax liability (asset) at end of period | 205,283 | 205,455
Unrealized loss [Member] |  |
Deferred tax liability (asset) at beginning of period | (86,156) | (87,440)
Deferred tax expense (income) recognised in profit or loss | 17,612 | 1,284
Deferred tax relating to items credited (charged) directly to equity | 0 | 0
Increase (decrease) in deferred tax liability (asset) | 17,612 | 1,284
Deferred tax liability (asset) at end of period | (68,544) | (86,156)
Property, plant and equipment and capitalized interest [Member] |  |
Deferred tax liability (asset) at beginning of period | 225,124 | 236,094
Deferred tax expense (income) recognised in profit or loss | (13,689) | (10,970)
Deferred tax relating to items credited (charged) directly to equity | 0 | 0
Increase (decrease) in deferred tax liability (asset) | (13,689) | (10,970)
Deferred tax liability (asset) at end of period | 211,435 | 225,124
Facility closure provision [Member] |  |
Deferred tax liability (asset) at beginning of period | (1,590) | 0
Deferred tax expense (income) recognised in profit or loss | (1,879) | (1,590)
Deferred tax relating to items credited (charged) directly to equity | 0 | 0
Increase (decrease) in deferred tax liability (asset) | (1,879) | (1,590)
Deferred tax liability (asset) at end of period | (3,469) | (1,590)
Manufacturing expenses [Member] |  |
Deferred tax liability (asset) at beginning of period | 110,630 | 109,134
Deferred tax expense (income) recognised in profit or loss | (7,882) | 1,496
Deferred tax relating to items credited (charged) directly to equity | 0 | 0
Increase (decrease) in deferred tax liability (asset) | (7,882) | 1,496
Deferred tax liability (asset) at end of period | 102,748 | 110,630
Staff severance indemnities, unemployment insurance [Member] |  |
Deferred tax liability (asset) at beginning of period | 5,214 | 4,155
Deferred tax expense (income) recognised in profit or loss | 1,876 | 1,980
Deferred tax relating to items credited (charged) directly to equity | (298) | (921)
Increase (decrease) in deferred tax liability (asset) | 1,578 | 1,059
Deferred tax liability (asset) at end of period | 6,792 | 5,214
Vacation accrual [Member] |  |
Deferred tax liability (asset) at beginning of period | (4,061) | (3,372)
Deferred tax expense (income) recognised in profit or loss | (826) | (689)
Deferred tax relating to items credited (charged) directly to equity | 0 | 0
Increase (decrease) in deferred tax liability (asset) | (826) | (689)
Deferred tax liability (asset) at end of period | (4,887) | (4,061)
Inventory provision [Member] |  |
Deferred tax liability (asset) at beginning of period | (20,608) | (29,428)
Deferred tax expense (income) recognised in profit or loss | (4,490) | 8,820
Deferred tax relating to items credited (charged) directly to equity | 0 | 0
Increase (decrease) in deferred tax liability (asset) | (4,490) | 8,820
Deferred tax liability (asset) at end of period | (25,098) | (20,608)
Materials provision [Member] |  |
Deferred tax liability (asset) at beginning of period | (7,776) | 0
Deferred tax expense (income) recognised in profit or loss | 669 | (7,776)
Deferred tax relating to items credited (charged) directly to equity | 0 | 0
Increase (decrease) in deferred tax liability (asset) | 669 | (7,776)
Deferred tax liability (asset) at end of period | (7,107) | (7,776)
Forwards [Member] |  |
Deferred tax liability (asset) at beginning of period | (10,206) | (12,322)
Deferred tax expense (income) recognised in profit or loss | 9,582 | 1,646
Deferred tax relating to items credited (charged) directly to equity | 0 | 470
Increase (decrease) in deferred tax liability (asset) | 9,582 | 2,116
Deferred tax liability (asset) at end of period | (624) | (10,206)
Employee benefits [Member] |  |
Deferred tax liability (asset) at beginning of period | (6,783) | (1,956)
Deferred tax expense (income) recognised in profit or loss | 4,466 | (4,827)
Deferred tax relating to items credited (charged) directly to equity | 0 | 0
Increase (decrease) in deferred tax liability (asset) | 4,466 | (4,827)
Deferred tax liability (asset) at end of period | (2,317) | (6,783)
Research and development expenses [Member] |  |
Deferred tax liability (asset) at beginning of period | 4,641 | 8,247
Deferred tax expense (income) recognised in profit or loss | (1,140) | (3,606)
Deferred tax relating to items credited (charged) directly to equity | 0 | 0
Increase (decrease) in deferred tax liability (asset) | (1,140) | (3,606)
Deferred tax liability (asset) at end of period | 3,501 | 4,641
Provision for legal complaints and expenses [Member] |  |
Deferred tax liability (asset) at beginning of period | (7,686) | (7,357)
Deferred tax expense (income) recognised in profit or loss | (3,064) | (329)
Deferred tax relating to items credited (charged) directly to equity | 0 | 0
Increase (decrease) in deferred tax liability (asset) | (3,064) | (329)
Deferred tax liability (asset) at end of period | (10,750) | (7,686)
Loan approval expenses [Member] |  |
Deferred tax liability (asset) at beginning of period | 3,115 | 3,651
Deferred tax expense (income) recognised in profit or loss | (445) | (536)
Deferred tax relating to items credited (charged) directly to equity | 0 | 0
Increase (decrease) in deferred tax liability (asset) | (445) | (536)
Deferred tax liability (asset) at end of period | 2,670 | 3,115
Junior mining companies valued based on stock price [Member] |  |
Deferred tax liability (asset) at beginning of period | 1,300 | 0
Deferred tax expense (income) recognised in profit or loss | 624 | 0
Deferred tax relating to items credited (charged) directly to equity | 550 | 1,300
Increase (decrease) in deferred tax liability (asset) | 1,174 | 1,300
Deferred tax liability (asset) at end of period | 2,474 | 1,300
Royalty [Member] |  |
Deferred tax liability (asset) at beginning of period | 6,457 | 6,410
Deferred tax expense (income) recognised in profit or loss | (2,389) | 47
Deferred tax relating to items credited (charged) directly to equity | 16 | 0
Increase (decrease) in deferred tax liability (asset) | (2,373) | 47
Deferred tax liability (asset) at end of period | 4,084 | 6,457
Tax loss benefit [Member] |  |
Deferred tax liability (asset) at beginning of period | (1,302) | (1,525)
Deferred tax expense (income) recognised in profit or loss | (135) | 223
Deferred tax relating to items credited (charged) directly to equity | 0 | 0
Increase (decrease) in deferred tax liability (asset) | (135) | 223
Deferred tax liability (asset) at end of period | (1,437) | (1,302)
Other deferred tax assets [Member] |  |
Deferred tax liability (asset) at beginning of period | 79 | 97
Deferred tax expense (income) recognised in profit or loss | 465 | (18)
Deferred tax relating to items credited (charged) directly to equity | 0 | 0
Increase (decrease) in deferred tax liability (asset) | 465 | (18)
Deferred tax liability (asset) at end of period | 544 | 79
Foreign items other [Member] |  |
Deferred tax liability (asset) at beginning of period | (664) | (82)
Deferred tax expense (income) recognised in profit or loss | 154 | (582)
Deferred tax relating to items credited (charged) directly to equity | 0 | 0
Increase (decrease) in deferred tax liability (asset) | 154 | (582)
Deferred tax liability (asset) at end of period | (510) | (664)
Accounts Receivable [Member] |  |
Deferred tax liability (asset) at beginning of period | (4,273) | (5,076)
Deferred tax expense (income) recognised in profit or loss | 51 | 803
Deferred tax relating to items credited (charged) directly to equity | 0 | 0
Increase (decrease) in deferred tax liability (asset) | 51 | 803
Deferred tax liability (asset) at end of period | $ (4,222) | $ (4,273)

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