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Income Taxes - Net Operating Loss Carryforwards (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses $ 165,180 $ 171,077
Expiring 2017    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses   5
Expiring 2018    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 176 133
Expiring 2019    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 180  
Expiring 2020 - and After    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 164,824  
Expiring 2019 - and After    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses   170,939
CANADA    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 122,853 116,009
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 122,853  
CANADA | Expiring 2019 - and After    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses   116,009
UNITED STATES    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 13,495 13,762
UNITED STATES | Expiring 2017    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses   0
UNITED STATES | Expiring 2018    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 120 120
UNITED STATES | Expiring 2019    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 86  
UNITED STATES | Expiring 2020 - and After    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 13,289  
UNITED STATES | Expiring 2019 - and After    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses   13,642
PERU    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 0 39,057
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 0  
PERU | Expiring 2019 - and After    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses   39,057
MEXICO    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 20,925 2,160
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 20,925  
MEXICO | Expiring 2019 - and After    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses   2,160
BARBADOS    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 103 58
BARBADOS | Expiring 2017    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses   5
BARBADOS | Expiring 2018    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 6 6
BARBADOS | Expiring 2019    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 4  
BARBADOS | Expiring 2020 - and After    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 93  
BARBADOS | Expiring 2019 - and After    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses   47
ARGENTINA    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 7,804 31
ARGENTINA | Expiring 2017    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses   0
ARGENTINA | Expiring 2018    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 50 7
ARGENTINA | Expiring 2019    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 90  
ARGENTINA | Expiring 2020 - and After    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses $ 7,664  
ARGENTINA | Expiring 2019 - and After    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses   $ 24