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Financial Instruments - Exposure to Currency Risk (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Cash and short-term investments $ 138,510 $ 175,953 $ 180,881
Deferred tax assets and liabilities (136,575) (168,549)  
Currency risk [member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Cash and short-term investments 29,595 41,446  
Other current and non-current assets 38,560 44,579  
Income taxes receivable (payable), current and non- current 4,614 (9,140)  
Accounts payable and accrued liabilities and non- current liabilities (76,800) (82,478)  
Deferred tax assets and liabilities (138,759) (168,549)  
Canadian Dollar | Currency risk [member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Cash and short-term investments 22,514 25,062  
Other current and non-current assets 1,793 529  
Income taxes receivable (payable), current and non- current 0 (713)  
Accounts payable and accrued liabilities and non- current liabilities (851) (348)  
Deferred tax assets and liabilities 0 0  
Mexican Peso | Currency risk [member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Cash and short-term investments 2,724 5,188  
Other current and non-current assets 18,873 22,809  
Income taxes receivable (payable), current and non- current 7,240 (242)  
Accounts payable and accrued liabilities and non- current liabilities (31,909) (26,013)  
Deferred tax assets and liabilities (106,383) (141,870)  
Argentinian Peso | Currency risk [member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Cash and short-term investments 2,677 4,239  
Other current and non-current assets 15,038 19,720  
Income taxes receivable (payable), current and non- current 1,134 837  
Accounts payable and accrued liabilities and non- current liabilities (18,739) (28,685)  
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 285 4,659  
Other current and non-current assets 532 495  
Income taxes receivable (payable), current and non- current (6,068) (3,840)  
Accounts payable and accrued liabilities and non- current liabilities (12,167) (13,954)  
Deferred tax assets and liabilities (9,372) (10,076)  
European Euro | Currency risk [member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Cash and short-term investments 127 24  
Other current and non-current assets 0 0  
Income taxes receivable (payable), current and non- current (332) (780)  
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 1,268 2,274  
Other current and non-current assets 2,324 1,026  
Income taxes receivable (payable), current and non- current 2,640 (4,402)  
Accounts payable and accrued liabilities and non- current liabilities (13,134) (13,478)  
Deferred tax assets and liabilities $ (23,004) $ (16,603)