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Contingencies and Capital Commitments (Narrative) (Details) - USD ($) |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Oct. 27, 2015 | Mar. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 11, 2015
Disclosure of other provisions [line items] |  |  |  |  |  |  |
Guarantees with government current year |  |  | $ 3,179,000 |  |  |  |
Guarantees with government next year |  |  | 4,990,000 |  |  |  |
Guarantees with government in two years |  |  | 6,928,000 |  |  |  |
Tax expense (income) |  |  | 38,646,000 | $ 29,252,000 |  |  |
Value added tax payables |  |  | 1,285,000 | 1,866,000 |  |  |
MEXICO | Tax contingent liability [member] |  |  |  |  |  |  |
Disclosure of other provisions [line items] |  |  |  |  |  |  |
Tax benefit assessment | $ 198,000 |  |  |  |  |  |
General import tax | 30,000 |  |  |  |  |  |
Value added tax payables | 90,000 |  |  |  |  |  |
Custom management tax | 5,000 |  |  |  |  |  |
Tax fines | $ 94,000 |  |  |  |  |  |
Tax effect security bond |  |  |  |  |  |  | $ 211,000
PERU | Tax contingent liability [member] |  |  |  |  |  |  |
Disclosure of other provisions [line items] |  |  |  |  |  |  |
Tax expense (income) |  |  |  |  | $ 1,750,000 | $ 1,750,000 |
Income tax interest and penaltie |  |  |  |  | 573,000 | 573,000 |
Income tax letter bond |  |  |  |  | $ 838,000 | $ 838,000 |
Income tax expense, interest and penalties, accrued |  |  | 0 | 0 |  |  |
Lindero Project [member] |  |  |  |  |  |  |
Disclosure of other provisions [line items] |  |  |  |  |  |  |
Capital commitments |  |  | 5,715,000 |  |  |  |
Provision for credit commitments [member] |  |  |  |  |  |  |
Disclosure of other provisions [line items] |  |  |  |  |  |  |
Undiscounted closure costs |  | $ 9,230,000 |  |  |  |  |
Progressive closure activities |  | 3,646,000 |  |  |  |  |
Final closure activities |  | 4,971,000 |  |  |  |  |
Post closure activities |  | $ 613,000 |  |  |  |  |
Bank letter of guarantee |  |  | $ 4,990,000 | $ 3,179,000 |  |  |

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