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Financial Instruments - Exposure to Currency Risk (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Cash and short-term investments $ 167,113 $ 120,564 $ 138,510
Deferred tax assets and   liabilities (117,461) (140,361)  
Currency risk [member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Cash and short-term investments 141,095 138,474  
Other current and non-current assets 78,877 94,177  
Income taxes receivable (payable), current and non- current (32,243) (7,749)  
Accounts payable and accrued liabilities and non- current liabilities (162,536) (153,421)  
Deferred tax assets and   liabilities (117,461) (140,361)  
Canadian Dollar | Currency risk [member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Cash and short-term investments 117,956 123,391  
Other current and non-current assets 4,952 3,897  
Income taxes receivable (payable), current and non- current 3,537 (769)  
Accounts payable and accrued liabilities and non- current liabilities (24,310) (23,387)  
Deferred tax assets and   liabilities 40,600 23,640  
Mexican Peso | Currency risk [member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Cash and short-term investments 1,020 5,222  
Other current and non-current assets 29,895 14,215  
Income taxes receivable (payable), current and non- current 3,657 6,902  
Accounts payable and accrued liabilities and non- current liabilities (45,050) (64,589)  
Deferred tax assets and   liabilities (72,552) (73,938)  
Argentine Peso | Currency risk [member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Cash and short-term investments 7,175 3,652  
Other current and non-current assets 16,878 18,511  
Income taxes receivable (payable), current and non- current 1,513 1,400  
Accounts payable and accrued liabilities and non- current liabilities (14,543) (16,143)  
Deferred tax assets and   liabilities 0 0  
Bolivian Boliviano | Currency risk [member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Cash and short-term investments 571 3,447  
Other current and non-current assets 218 221  
Income taxes receivable (payable), current and non- current (2,443) (3,135)  
Accounts payable and accrued liabilities and non- current liabilities (19,402) (8,749)  
Deferred tax assets and   liabilities (7,700) (9,925)  
European Euro | Currency risk [member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Cash and short-term investments 3 3  
Other current and non-current assets 0 0  
Income taxes receivable (payable), current and non- current 0 0  
Accounts payable and accrued liabilities and non- current liabilities 0 0  
Deferred tax assets and   liabilities 0 0  
Peruvian Sol | Currency risk [member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Cash and short-term investments 13,917 2,406  
Other current and non-current assets 26,257 55,851  
Income taxes receivable (payable), current and non- current (38,507) (12,147)  
Accounts payable and accrued liabilities and non- current liabilities (54,672) (39,884)  
Deferred tax assets and   liabilities (77,810) (80,138)  
Guatemala quetzal | Currency risk [member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Cash and short-term investments 453 353  
Other current and non-current assets 677 1,482  
Income taxes receivable (payable), current and non- current 0 0  
Accounts payable and accrued liabilities and non- current liabilities (4,559) (669)  
Deferred tax assets and   liabilities $ 1 $ 0