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Long-term debt (Narrative) (Details)
$ in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2021
CAD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
CAD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2017
CAD ($)
$ / shares
Dec. 31, 2016
CAD ($)
Disclosure of detailed information about borrowings [line items]            
Accordion feature $ 100,000   $ 100,000      
Revolving credit facility 113,389   63,659      
Convertible debenture 300,000   350,000      
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]            
Increase in revolving credit facility available balance 150,000          
Revolving credit facility, available balance 550,000          
Accordion feature 100,000          
Revolving credit facility $ 113,400          
Revolving credit facility drawn during period   $ 50 $ 63,400 $ 50    
Borrowings, interest rate 2.25%          
Additional amount withdrawn to repay Investissement Quebec convertible debenture $ 50,000          
Revolving credit facility [Member] | Top of range [Member]            
Disclosure of detailed information about borrowings [line items]            
Revolving credit facility, available balance $ 650,000