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Income Taxes - Net Operating Loss Carryforwards (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses $ 284,626 $ 202,181
Expiring 2020    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses   2,197
Expiring 2021    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 352 355
Expiring 2022    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 544  
Expiring 2023 - and After    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 283,730  
Expiring 2022 - and After    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses   199,629
CANADA    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 269,001 178,339
CANADA | Expiring 2020    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses   0
CANADA | Expiring 2021    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 0 0
CANADA | Expiring 2022    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 0  
CANADA | Expiring 2023 - and After    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 269,001  
CANADA | Expiring 2022 - and After    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses   178,339
UNITED STATES    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 12,592 13,582
UNITED STATES | Expiring 2020    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses   79
UNITED STATES | Expiring 2021    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 317 318
UNITED STATES | Expiring 2022    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 529  
UNITED STATES | Expiring 2023 - and After    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 11,746  
UNITED STATES | Expiring 2022 - and After    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses   13,185
PERU    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 340 3,916
PERU | Expiring 2020    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses   2,110
PERU | Expiring 2021    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 26 28
PERU | Expiring 2022    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 0  
PERU | Expiring 2023 - and After    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 314  
PERU | Expiring 2022 - and After    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses   1,778
MEXICO    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 2,406 2,792
MEXICO | Expiring 2020    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses   0
MEXICO | Expiring 2021    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 0 0
MEXICO | Expiring 2022    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 0  
MEXICO | Expiring 2023 - and After    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 2,406  
MEXICO | Expiring 2022 - and After    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses   2,792
BARBADOS    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 203 120
BARBADOS | Expiring 2020    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses   7
BARBADOS | Expiring 2021    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 8 7
BARBADOS | Expiring 2022    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 12  
BARBADOS | Expiring 2023 - and After    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 183  
BARBADOS | Expiring 2022 - and After    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses   106
ARGENTINA    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 84 3,432
ARGENTINA | Expiring 2020    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses   1
ARGENTINA | Expiring 2021    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 1 2
ARGENTINA | Expiring 2022    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses 3  
ARGENTINA | Expiring 2023 - and After    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses $ 80  
ARGENTINA | Expiring 2022 - and After    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax operating losses   $ 3,429