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Shares - Common shares (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance, outstanding (in shares) 25,452,224 28,305,660
Issued upon exercise of stock options (in shares) 297,940 176,800
Issued upon conversion of convertible debentures (in shares) 2,211  
Purchase of treasury shares for settlement of certain equity classified stock-based compensation (in shares) (660,620) (758,271)
Settlement of certain equity classified stock-based compensation (in shares) 1,193,935 353,592
Retired through share purchase programs (in shares) (1,281,485) (2,625,557)
Ending balance, outstanding (in shares) 25,004,205 25,452,224
Shares to satisfy recipient tax withholding requirements (in shares) 553,036,000 161,285,000
Satisfaction of recipient tax withholding $ 4,308 $ 987
Common shares    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance, outstanding (in shares) 28,070,150 30,518,907
Issued upon exercise of stock options (in shares) 297,940 176,800
Issued upon conversion of convertible debentures (in shares) 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) (2,625,557)
Ending balance, outstanding (in shares) 27,088,816 28,070,150
Treasury shares    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance, outstanding (in shares) (2,617,926) (2,213,247)
Issued upon exercise of stock options (in shares) 0 0
Issued upon conversion of convertible debentures (in shares) 0  
Purchase of treasury shares for settlement of certain equity classified stock-based compensation (in shares) (660,620) (758,271)
Settlement of certain equity classified stock-based compensation (in shares) 1,193,935 353,592
Retired through share purchase programs (in shares) 0 0
Ending balance, outstanding (in shares) (2,084,611) (2,617,926)