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Long-term debt (Narrative) (Details)
$ in Thousands
 1 Months Ended 12 Months Ended
Apr. 30, 2022
CAD ($)
Dec. 31, 2022
CAD ($)
Dec. 31, 2021
CAD ($)
Dec. 31, 2017
CAD ($)
$ / shares
Dec. 31, 2016
CAD ($)
Disclosure of detailed information about borrowings [line items]          
Convertible debenture   $ 0 $ 300,000    
Accordion feature   200,000 100,000    
Repayment of revolving credit facility   113,120 0    
Revolving credit facility   150,000 113,389    
Convertible debenture (2016) [Member]          
Disclosure of detailed information about borrowings [line items]          
Convertible debenture         $ 50,000
Convertible debenture (2017) [Member]          
Disclosure of detailed information about borrowings [line items]          
Convertible debenture       $ 300,000  
Borrowings, interest rate       4.00%  
Conversion price | $ / shares       22.89  
Convertible debenture (2017) [Member] | Public offering [Member]          
Disclosure of detailed information about borrowings [line items]          
Convertible debenture       $ 184,000  
Convertible debenture (2017) [Member] | Private placements offering [Member]          
Disclosure of detailed information about borrowings [line items]          
Convertible debenture       $ 116,000  
Revolving credit facility [Member]          
Disclosure of detailed information about borrowings [line items]          
Revolving credit facility, available balance   550,000      
Accordion feature   200,000 $ 100,000    
Repayment of revolving credit facility $ 113,100        
Revolving credit facility drawn during period   $ 150,000      
Borrowings, interest rate   6.30%      
Revolving credit facility [Member] | Maximum [Member]          
Disclosure of detailed information about borrowings [line items]          
Revolving credit facility, available balance   $ 750,000