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Shares - Common shares (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance, outstanding (in shares) 25,004,205 25,452,224
Issued upon exercise of stock options (in shares) 327,000 297,940
Issued upon conversion of convertible debentures (in shares) 87,096 2,211
Purchase of treasury shares for settlement of certain equity classified stock-based compensation (in shares) (735,857) (660,620)
Settlement of certain equity classified stock-based compensation (in shares) 1,095,001 1,193,935
Retired through share purchase programs (in shares)   (1,281,485)
Ending balance, outstanding (in shares) 25,777,445 25,004,205
Shares to satisfy recipient tax withholding requirements (in shares) 513,540,000 553,036,000
Satisfaction of recipient tax withholding $ 7,246 $ 4,308
Common shares    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance, outstanding (in shares) 27,088,816 28,070,150
Issued upon exercise of stock options (in shares) 327,000 297,940
Issued upon conversion of convertible debentures (in shares) 87,096 2,211
Purchase of treasury shares for settlement of certain equity classified stock-based compensation (in shares) 0 0
Settlement of certain equity classified stock-based compensation (in shares) 0 0
Retired through share purchase programs (in shares)   (1,281,485)
Ending balance, outstanding (in shares) 27,502,912 27,088,816
Treasury shares    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance, outstanding (in shares) (2,084,611) (2,617,926)
Issued upon exercise of stock options (in shares) 0 0
Issued upon conversion of convertible debentures (in shares) 0 0
Purchase of treasury shares for settlement of certain equity classified stock-based compensation (in shares) (735,857) (660,620)
Settlement of certain equity classified stock-based compensation (in shares) 1,095,001 1,193,935
Retired through share purchase programs (in shares)   0
Ending balance, outstanding (in shares) (1,725,467) (2,084,611)