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Share Capital (Share Purchase Warrants) (Details)
shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2017
CAD / shares
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
Disclosure of classes of share capital [line items]      
Number of warrants (in shares) 12,232 12,232  
Common shares issuable (in shares) 12,232 12,232  
Gains on derivatives | $   $ 2.3 $ 1.6
Warrants - Esperanza [Member]      
Disclosure of classes of share capital [line items]      
Number of warrants (in shares) 7,167 7,167  
Common shares issuable (in shares) 7,167 7,167  
Exercise price (CAD per share) | CAD / shares CAD 28.46    
Warrants - Carlisle [Member]      
Disclosure of classes of share capital [line items]      
Number of warrants (in shares) 5,065 5,065  
Common shares issuable (in shares) 5,065 5,065  
Exercise price (CAD per share) | CAD / shares CAD 10.00