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Marketable Securities (Narrative) (Details) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2017 CAD ($) shares | Feb. 28, 2017 | Jun. 30, 2016 shares | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Disclosure of financial assets [line items] |  |  |  |  |  |
Gain (loss) unrealized in profit loss |  |  |  | $ (85) |  | $ 80
Gain (loss) unrealized in other comprehensive income |  |  |  | (307) | $ 334 |
Gain (loss) unrealized in OCI including reversals |  |  |  | $ (555) | $ 334 |
Medgold Resources Corporation [member] |  |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |  |
Number of shares acquired by entity | shares |  |  | 10,000,000 |  |  |
Number of warrants acquired by entity | shares |  |  | 10,000,000 |  |  |
Medgold Resources Corporation [member] | Associates [member] |  |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |  |
Proportion of ownership interest in associate |  | 24.00% |  |  |  |
Proportion of ownership interest including diluted portion in associate |  | 20.40% |  |  |  |
Prospero Silver Corporation [member] |  |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |  |
Number of units acquired by entity | shares | 5,357,142 |  |  |  |  |
Proportion of ownership interest | 15.00% |  |  |  |  |
Proportion of ownership interest if all warrants exercised | 25.95% |  |  |  |  |
Purchased per unit price paid by entity | 0.28 |  |  |  |  |
Available for sale interest in investment | $ 1,500,000 |  |  |  |  |
Strike price per warrant | 0.35 |  |  |  |  |
Approved amount of ownership percentage authorized by the board of directors | 19.9 |  |  |  |  |

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