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Shares - Common shares (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance, outstanding (in shares) 25,777,445 25,004,205
Issued upon exercise of stock options (in shares) 109,100 327,000
Issued upon conversion of convertible debentures (in shares) 4,622,916 87,096
Retired through share purchase programs (in shares) (1,223,097)  
Purchase of treasury shares (in shares) (907,462) (735,857)
Settlement of certain equity classified stock-based compensation (in shares) 787,728 1,095,001
Ending balance, outstanding (in shares) 29,166,630 25,777,445
Shares to satisfy recipient tax withholding requirements (in shares) 372,628,000 513,540,000
Satisfaction of recipient tax withholding $ 3,576 $ 7,246
Common shares    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance, outstanding (in shares) 27,502,912 27,088,816
Issued upon exercise of stock options (in shares) 109,100 327,000
Issued upon conversion of convertible debentures (in shares) 4,622,916 87,096
Retired through share purchase programs (in shares) (1,223,097)  
Purchase of treasury shares (in shares) 0 0
Settlement of certain equity classified stock-based compensation (in shares) 0 0
Ending balance, outstanding (in shares) 31,011,831 27,502,912
Treasury shares    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance, outstanding (in shares) (1,725,467) (2,084,611)
Issued upon exercise of stock options (in shares) 0 0
Issued upon conversion of convertible debentures (in shares) 0 0
Retired through share purchase programs (in shares) 0  
Purchase of treasury shares (in shares) (907,462) (735,857)
Settlement of certain equity classified stock-based compensation (in shares) 787,728 1,095,001
Ending balance, outstanding (in shares) (1,845,201) (1,725,467)