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Financial risks - Disclosure of detailed information about foreign currency risk (Details)
$ in Thousands, $ in Thousands
Dec. 31, 2019
CAD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
CAD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
CAD ($)
Disclosure Of Financial Risks [Line Items]          
Cash $ 108,223   $ 174,265   $ 333,705
Amounts receivable 6,330   12,321    
Accounts payable and accrued liabilities (18,772)   (11,732)    
Revolving credit facility (19,482)   (30,000)    
Equivalent in CDN [Member]          
Disclosure Of Financial Risks [Line Items]          
Net exposure in foreign currencies $ 41,234   $ 54,987    
Amounts held in US dollars [Member]          
Disclosure Of Financial Risks [Line Items]          
Cash   $ 46,267   $ 38,677  
Amounts receivable   0   1,011  
Other assets   567   641  
Accounts payable and accrued liabilities   (86)   (22)  
Revolving credit facility   (15,000)   0  
Net exposure in foreign currencies   $ 31,748   $ 40,307