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Financial instruments and risk management - Foreign currency risk (Details) - Foreign currency risk - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Euro    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic $ 1,787 $ 0
CAD    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 202,905 40,835
Trade and other payables | Euro    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic (158) (746)
Trade and other payables | CAD    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic (217) (33)
Borrowings | Euro    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 0 0
Borrowings | CAD    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 0 0
Cash and cash equivalents | Euro    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 976 110
Cash and cash equivalents | CAD    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 201,467 38,759
Trade and other receivables | Euro    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 969 636
Trade and other receivables | CAD    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic $ 1,655 $ 2,109