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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