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Contingencies and Capital Commitments (Narrative) (Details) - USD ($) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Oct. 27, 2015 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 11, 2015
Disclosure of other provisions [line items] |  |  |  |  |  |
Guarantees with government current year |  | $ 4,990 |  |  |  |
Guarantees with government next year |  | 7,237 |  |  |  |
Guarantees with government in two years |  | 9,704 |  |  |  |
Tax expense (income) |  | $ 33,350 | $ 38,646 |  |  |
SGM Royalty (as percentage) |  | 3.00% |  |  |  |
Value added tax payables |  |  | 1,285 |  |  |
MEXICO | Tax contingent liability [member] |  |  |  |  |  |
Disclosure of other provisions [line items] |  |  |  |  |  |
Tax benefit assessment | $ 198 |  |  |  |  |
General import tax | 30 |  |  |  |  |
Value added tax payables | 90 |  |  |  |  |
Custom management tax | 5 |  |  |  |  |
Tax fines | $ 94 |  |  |  |  |
Tax effect security bond |  |  |  |  |  | $ 211
PERU | Tax contingent liability [member] |  |  |  |  |  |
Disclosure of other provisions [line items] |  |  |  |  |  |
Tax expense (income) |  |  |  | $ 1,313 | $ 1,313 |
Income tax interest and penalties |  |  |  | $ 872 | $ 872 |
Income tax expense, interest and penalties, accrued |  | $ 0 | 0 |  |  |
Lindero Project [member] |  |  |  |  |  |
Disclosure of other provisions [line items] |  |  |  |  |  |
Capital commitments |  | 111,940 |  |  |  |
Provision for credit commitments [member] |  |  |  |  |  |
Disclosure of other provisions [line items] |  |  |  |  |  |
Undiscounted closure costs |  | 11,431 |  |  |  |
Progressive closure activities |  | 3,646 |  |  |  |
Final closure activities |  | 7,156 |  |  |  |
Post closure activities |  | 790 |  |  |  |
Bank letter of guarantee |  | $ 7,237 | $ 4,990 |  |  |

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