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Derivative Assets and Derivative Liabilities (Narrative) (Details) $ in Thousands | 1 Months Ended | 12 Months Ended | 33 Months Ended |
--- | --- | --- | --- | ---
Jul. 31, 2017 $ / T | Jan. 31, 2017 t $ / T | Dec. 31, 2017 USD ($) | Nov. 30, 2017 t $ / T | Dec. 31, 2016 USD ($) | Dec. 31, 2017 | Apr. 01, 2015 USD ($)
Disclosure of financial assets [line items] |  |  |  |  |  |  |
Proceeds from sales or maturity of financial instruments, classified as investing activities | $ |  |  | $ 160,636 |  | $ 41,845 |  |
Interest rate swap contract [member] | Interest rate risk [member] |  |  |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |  |  |
Nominal amount of hedging instrument | $ |  |  |  |  |  |  | 40,000
Derivative contract interest rate |  |  |  |  |  | 1.52% |
Gains (losses) on cash flow hedges, net of tax | $ |  |  | 369 |  | $ 85 |  |
Proceeds from sales or maturity of financial instruments, classified as investing activities | $ |  |  | $ 214 |  |  |  |
Zinc Commodity [member] | December 2016 One [member] | Forward contract [member] |  |  |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |  |  |
Derivative contract quantity of commodity |  |  |  | 3,900 |  |  |
Derivative contract price per commodity |  |  |  | 2,650 |  |  |
Zinc Commodity [member] | December 2016 Two [member] | Forward contract [member] |  |  |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |  |  |
Derivative contract quantity of commodity |  |  |  | 3,900 |  |  |
Derivative contract price per commodity |  |  |  | 2,750 |  |  |
Derivative contract monthly settled tonnes | t |  |  |  | 650 |  |  |
Zinc Commodity [member] | July 2017 Two [member] | Forward contract [member] |  |  |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |  |  |
Derivative contract quantity of commodity | 6,500 |  |  |  |  |  |
Derivative contract cap price per tonne | 2,965 |  |  |  |  |  |
Derivative contract floor price per tonne | 2,500 |  |  |  |  |  |
Lead Commodity [member] | Forward contract [member] |  |  |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |  |  |
Derivative contract quantity of commodity |  | 2,965 |  |  |  |  |
Derivative contract price per commodity |  | 2,340 |  |  |  |  |
Derivative contract monthly settled tonnes | t |  | 270 |  |  |  |  |
Lead Commodity [member] | July 2017 One [member] | Forward contract [member] |  |  |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |  |  |
Derivative contract quantity of commodity | 7,500 |  |  |  |  |  |
Derivative contract cap price per tonne | 2,500 |  |  |  |  |  |
Derivative contract floor price per tonne | 2,100 |  |  |  |  |  |

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