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Revenue (Schedule of Disaggregation of Revenue) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |  |
Gross revenue | $ 17,129 | $ 13,689 | $ 68,100 | $ 54,353
Treatment and selling costs | (5,395) | (3,875) | (18,632) | (12,119)
Revenue | 11,734 | 9,814 | 49,468 | 42,234
Silver [Member] |  |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |  |
Provisional sales revenue | 4,563 | 5,813 | 16,501 | 23,986
Derivative pricing adjustments | (298) | 151 | (343) | 1,466
Gross revenue | 4,265 | 5,964 | 16,158 | 25,452
Zinc [Member] |  |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |  |
Provisional sales revenue | 8,941 | 1,406 | 32,104 | 7,655
Derivative pricing adjustments | (2,494) | 330 | (2,726) | 544
Gross revenue | 6,447 | 1,736 | 29,378 | 8,199
Lead [Member] |  |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |  |
Provisional sales revenue | 6,785 | 5,475 | 22,641 | 18,461
Derivative pricing adjustments | (489) | 213 | (440) | 312
Gross revenue | 6,296 | 5,688 | 22,201 | 18,773
Other by-products [Member] |  |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |  |
Provisional sales revenue | 133 | 300 | 360 | 1,927
Derivative pricing adjustments | (12) | 1 | 3 | 2
Gross revenue | $ 121 | $ 301 | $ 363 | $ 1,929

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