Segmented Information - Revenue by Product (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Disclosure of products and services [line items]
Revenue	$ 784,495	$ 816,828
Refined silver and gold [member]
Disclosure of products and services [line items]
Revenue	348,717	345,756
Zinc concentrate [member]
Disclosure of products and services [line items]
Revenue	155,412	140,315
Lead concentrate [member]
Disclosure of products and services [line items]
Revenue	150,832	161,981
Copper concentrate [member]
Disclosure of products and services [line items]
Revenue	86,599	114,564
Silver Concentrate [member]
Disclosure of products and services [line items]
Revenue	$ 42,935	$ 54,212

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