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Income Taxes - Net Operating Loss Carryforwards (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses $ 131,179 $ 165,180
Expiring 2017    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses   176
Expiring 2018    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 134 180
Expiring 2019    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 148  
Expiring 2020 - and After    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 130,897  
Expiring 2019 - and After    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses   164,824
CANADA    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 114,466 122,853
CANADA | Expiring 2017    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses   0
CANADA | Expiring 2018    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 0 0
CANADA | Expiring 2019    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 0  
CANADA | Expiring 2020 - and After    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 114,466  
CANADA | Expiring 2019 - and After    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses   122,853
UNITED STATES    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 13,634 13,495
UNITED STATES | Expiring 2017    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses   120
UNITED STATES | Expiring 2018    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 85 86
UNITED STATES | Expiring 2019    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 80  
UNITED STATES | Expiring 2020 - and After    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 13,469  
UNITED STATES | Expiring 2019 - and After    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses   13,289
PERU    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 250 0
PERU | Expiring 2017    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses   0
PERU | Expiring 2018    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 0 0
PERU | Expiring 2019    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 0  
PERU | Expiring 2020 - and After    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 250  
PERU | Expiring 2019 - and After    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses   0
MEXICO    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 2,456 20,925
MEXICO | Expiring 2017    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses   0
MEXICO | Expiring 2018    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 0 0
MEXICO | Expiring 2019    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 0  
MEXICO | Expiring 2020 - and After    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 2,456  
MEXICO | Expiring 2019 - and After    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses   20,925
BARBADOS    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 116 103
BARBADOS | Expiring 2017    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses   6
BARBADOS | Expiring 2018    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 4 4
BARBADOS | Expiring 2019    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 7  
BARBADOS | Expiring 2020 - and After    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 105  
BARBADOS | Expiring 2019 - and After    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses   93
ARGENTINA    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 257 7,804
ARGENTINA | Expiring 2017    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses   50
ARGENTINA | Expiring 2018    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 45 90
ARGENTINA | Expiring 2019    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 61  
ARGENTINA | Expiring 2020 - and After    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses $ 151  
ARGENTINA | Expiring 2019 - and After    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses   $ 7,664