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Inventories (Schedule of Inventories) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Inventories [abstract] |  |
Concentrate stockpiles | $ 1,671 | $ 2,594
Ore stockpiles | 3,166 | 4,144
Materials and supplies | 9,549 | 11,015
Total current inventories | 14,386 | 17,753
Cost of inventories recognised as expense during period | 162,751 | 156,614
Inventories write down of materials and supplies to net realizable value | $ 206 | $ 985

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- Definition Inventories [abstract]. + References No definition available. + Details
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