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Derivative Assets and Derivative Liabilities (Narrative) (Details) $ in Thousands | 1 Months Ended | 11 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jan. 31, 2018 USD ($) | Dec. 31, 2018 | Dec. 31, 2018 USD ($) $ / T | Dec. 31, 2017 USD ($) $ / T | Apr. 01, 2015 USD ($)
Disclosure of financial assets [line items] |  |  |  |  |
Proceeds from sales or maturity of financial instruments, classified as investing activities | $ |  |  | $ 191,632 | $ 160,636 |
Interest rate swap contract [member] | Interest rate risk [member] |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |
Nominal amount of hedging instrument | $ | 40,000 |  |  |  | 40,000
Term (in years) | 4 years |  |  |  |
Derivative contract interest rate | 1.52% | 2.61% |  |  |
Gains (losses) on cash flow hedges, net of tax | $ |  |  | $ 156 | $ 369 |
Proceeds from sales or maturity of financial instruments, classified as investing activities | $ | $ 214 |  |  |  |
Zinc Commodity [member] | Maturing from January to October 2018 | 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 |  |
Zinc Commodity [member] | Maturing between November 2018 and June 2019 |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |
Derivative contract quantity of commodity |  |  | 6,000 |  |
Derivative contract cap price per tonne |  |  | 3,300 |  |
Derivative contract floor price per tonne |  |  | 3,050 |  |
Lead Commodity [member] | Maturing from August 2017 to October 2018 | 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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