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Share capital - Disclosure of dividends (Details) - CAD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of classes of share capital [line items]    
Dividend payable $ 7,874 $ 7,779
February 20, 2019 [Member]    
Disclosure of classes of share capital [line items]    
Dividend per share $ 0.05  
Dividend payable $ 7,757,000  
Shares issued under dividend reinvestment plan 5,087,058  
May 1, 2019 [Member]    
Disclosure of classes of share capital [line items]    
Dividend per share $ 0.05  
Dividend payable $ 7,145,000  
Shares issued under dividend reinvestment plan 8,157,756  
July 31, 2019 [Member]    
Disclosure of classes of share capital [line items]    
Dividend per share $ 0.05  
Dividend payable $ 7,200,000  
Shares issued under dividend reinvestment plan 5,672,755  
November 6, 2019 [Member]    
Disclosure of classes of share capital [line items]    
Dividend per share $ 0.05  
Dividend payable $ 7,874,000  
Shares issued under dividend reinvestment plan 6,666,723  
Year 2019 [Member]    
Disclosure of classes of share capital [line items]    
Dividend per share $ 0.20  
Dividend payable $ 29,976,000  
February 16, 2018 [Member]    
Disclosure of classes of share capital [line items]    
Dividend per share   $ 0.05
Dividend payable   $ 7,811,000
Shares issued under dividend reinvestment plan   27,302,917
May 3, 2018 [Member]    
Disclosure of classes of share capital [line items]    
Dividend per share   $ 0.05
Dividend payable   $ 7,811,000
Shares issued under dividend reinvestment plan   8,097,787
August 2, 2018 [Member]    
Disclosure of classes of share capital [line items]    
Dividend per share   $ 0.05
Dividend payable   $ 7,812,000
Shares issued under dividend reinvestment plan   28,065,085
November 6, 2018 [Member]    
Disclosure of classes of share capital [line items]    
Dividend per share   $ 0.05
Dividend payable   $ 7,779,000
Shares issued under dividend reinvestment plan   29,627,597
Year 2018 [Member]    
Disclosure of classes of share capital [line items]    
Dividend per share   $ 0.20
Dividend payable   $ 31,213,000