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Subsequent Event	12 Months Ended
	Dec. 31, 2017
Disclosure of events after reporting period [Abstract]
Subsequent Event	20. SUBSEQUENT EVENT Subsequent to December 31, 2017, AuRico Metals was acquired by a third party for CAD$1.80 per share. The Company received $22.1 million in proceeds on its investment, resulting in a gain of $13.2 million, based on an average cost of CAD$0.72 per share. In addition, the Company disposed of its position in Corex for $2.6 million or CAD$0.13 per share, resulting in a gain of $0.6 million, based on an average cost of CAD$0.10 per share. These gains will be recorded within equity in the first quarter of 2018.

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- Definition

Disclosure of events after reporting period [Abstract]

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No definition available.

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The entire disclosure for events after the reporting period.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 10
-IssueDate 2017-01-01
-Section Disclosure
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-URIDate 2017-03-09

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