Segmented Information - Revenue by Product (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Disclosure of products and services [line items]
Revenue	$ 816,828	$ 774,775
Refined silver and gold [member]
Disclosure of products and services [line items]
Revenue	345,756	399,339
Zinc concentrate [member]
Disclosure of products and services [line items]
Revenue	140,315	93,237
Lead concentrate [member]
Disclosure of products and services [line items]
Revenue	161,981	125,123
Copper concentrate [member]
Disclosure of products and services [line items]
Revenue	114,564	95,123
Silver Concentrate [member]
Disclosure of products and services [line items]
Revenue	$ 54,212	$ 61,953

The income arising in the course of an entity's ordinary activities. Income is increases in economic benefits during the accounting period in the form of inflows or enhancements of assets or decreases of liabilities that result in an increase in equity, other than those relating to contributions from equity participants.

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+ Details