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v3.19.1

Sales (Schedule of Sales by Product and Geographical Area) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Disclosure of geographical areas [line items] |  |
Sales/Revenue to/from external customers | $ 263,296 | $ 268,111
Provisional pricing adjustment | 5,940 | 176
Silver Gold Concentrates [member] |  |
Disclosure of geographical areas [line items] |  |
Sales/Revenue to/from external customers | 180,151 | 180,491
Silver Lead Concentrates [member] |  |
Disclosure of geographical areas [line items] |  |
Sales/Revenue to/from external customers | 40,254 | 42,144
Zinc Concentrates [member] |  |
Disclosure of geographical areas [line items] |  |
Sales/Revenue to/from external customers | 48,831 | 45,300
PERU |  |
Disclosure of geographical areas [line items] |  |
Sales/Revenue to/from external customers | 87,449 | 88,115
Provisional pricing adjustment | 1,636 | 671
PERU | Silver Lead Concentrates [member] |  |
Disclosure of geographical areas [line items] |  |
Sales/Revenue to/from external customers | 40,254 | 42,144
PERU | Zinc Concentrates [member] |  |
Disclosure of geographical areas [line items] |  |
Sales/Revenue to/from external customers | 48,831 | 45,300
MEXICO |  |
Disclosure of geographical areas [line items] |  |
Sales/Revenue to/from external customers | 12,421 | 179,996
Provisional pricing adjustment | 1,249 | (495)
MEXICO | Silver Gold Concentrates [member] |  |
Disclosure of geographical areas [line items] |  |
Sales/Revenue to/from external customers | 13,670 | $ 180,491
Switzerland |  |
Disclosure of geographical areas [line items] |  |
Sales/Revenue to/from external customers | 163,426 |
Provisional pricing adjustment | 3,055 |
Switzerland | Silver Gold Concentrates [member] |  |
Disclosure of geographical areas [line items] |  |
Sales/Revenue to/from external customers | $ 166,481 |

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