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Supplemental Cash Flow Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Other operating activities      
Share-based compensation expense $ 2,957 $ 3,077  
Loss on securities held 3,298 0  
Gains on commodity and foreign currency contracts (Note 8) (4,930) (606)  
Loss (gain) on derivatives (Note 8) 1,078 (64)  
Loss on inventory 4,670 0  
Share of income from associate and dilution gain (Note 13) (13,679) (2,052)  
NRV adjustment for inventories 24,330 12,308  
Other inflows (outflows) of cash, classified as operating activities 17,724 12,663  
Changes in non-cash operating working capital items:      
Trade and other receivables 6,256 9,852  
Inventories (12,128) 10,898  
Prepaid expenses 1,878 (3,096)  
Accounts payable and accrued liabilities 8,053 2,569  
Provisions (8,320) (8,514)  
Changes in non-cash working capital (4,261) 11,709  
Significant non-cash items:      
Assets acquired by finance lease 7,028 5,000  
Shares issued as compensation (Note 25) 1,879 2,020  
Shares issued as consideration for select Argentine projects (Note 11) 0 8,650  
Cash and Cash Equivalents      
Cash in banks 77,735 160,001  
Short-term money market investments 60,775 15,952  
Cash and cash equivalents 138,510 175,953 $ 180,881
Issued capital      
Significant non-cash items:      
Shares issued as compensation (Note 25) $ 1,879 $ 2,020