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Supplemental Cash Flow Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Other operating activities      
Share-based compensation expense $ 3,077 $ 3,826  
Gain on derivatives (Note 7) (64) 0  
Share of loss from associate and dilution gain (Note 12) 2,052 7,946  
Net realizable value adjustment for inventories (Note 21) (12,308) 42,815  
Other inflows (outflows) of cash, classified as operating activities 13,269 (46,935)  
Changes in non-cash operating working capital items:      
Trade and other receivables 9,852 (29,125)  
Inventories 10,898 19,527  
Prepaid expenses (3,096) (3,675)  
Accounts payable and accrued liabilities 2,569 13,722  
Provisions (8,514) (5,994)  
Changes in non-cash working capital 11,709 (5,545)  
Cash and Cash Equivalents      
Cash in banks 160,001 157,778  
Short-term money markets investments 15,952 23,103  
Cash and cash equivalents 175,953 180,881 $ 133,963
Significant non-cash items [Abstract]      
Assets acquired by finance lease 5,000 6,151  
Shares issued as compensation (Note 25) 2,020 2,365  
Shares issued as consideration for Joaquin (Note 10) 8,650 0  
Issued capital      
Significant non-cash items [Abstract]      
Shares issued as compensation (Note 25) $ 2,020 $ 2,365