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Income Taxes - Net Operating Loss Carryforwards (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses $ 239,216 $ 131,179
Expiring 2017    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses   134
Expiring 2018    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 2,197 148
Expiring 2019    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 355  
Expiring 2020 - and After    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 236,664  
Expiring 2019 - and After    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses   130,897
CANADA    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 215,374 114,466
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 215,374  
CANADA | Expiring 2019 - and After    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses   114,466
UNITED STATES    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 13,582 13,634
UNITED STATES | Expiring 2017    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses   85
UNITED STATES | Expiring 2018    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 79 80
UNITED STATES | Expiring 2019    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 318  
UNITED STATES | Expiring 2020 - and After    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 13,185  
UNITED STATES | Expiring 2019 - and After    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses   13,469
PERU    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 3,916 250
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 2,110 0
PERU | Expiring 2019    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 28  
PERU | Expiring 2020 - and After    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 1,778  
PERU | Expiring 2019 - and After    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses   250
MEXICO    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 2,792 2,456
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 2,792  
MEXICO | Expiring 2019 - and After    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses   2,456
BARBADOS    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 120 116
BARBADOS | Expiring 2017    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses   4
BARBADOS | Expiring 2018    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 7 7
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 106  
BARBADOS | Expiring 2019 - and After    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses   105
ARGENTINA    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 3,432 257
ARGENTINA | Expiring 2017    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses   45
ARGENTINA | Expiring 2018    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 1 61
ARGENTINA | Expiring 2019    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 2  
ARGENTINA | Expiring 2020 - and After    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses $ 3,429  
ARGENTINA | Expiring 2019 - and After    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses   $ 151