Segmented Information - Company's Metal Revenues from Operations (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Products And Services [Abstract]
Gold	$ 104,510	$ 122,916
Silver by-product	652	957
Metal revenues	$ 105,162	$ 123,873

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