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Share-Based Compensation And Other Related Information - Option Activity (Details)
12 Months Ended
Dec. 31, 2018
CAD ($)
shares
Dec. 31, 2017
CAD ($)
shares
Disclosure of share-based payment arrangements [Abstract]    
Share options outstanding, beginning (shares) | shares 936,123 1,310,864
Granted (shares) | shares 149,163 91,945
Exercised (shares) | shares (125,762) (307,266)
Expired (shares) | shares (211,614) (61,891)
Forfeited (shares) | shares (49,523) (97,529)
Share options outstanding, ending (shares) | shares 698,387 936,123
Outstanding, beginning of period (CAD$ per share) | $ $ 16.56 $ 16.81
Granted (CAD$ per share) | $ 17.53 18.64
Exercised (CAD$ per share) | $ 11.14 11.24
Expired (CAD$ per share) | $ 24.90 40.22
Forfeited (CAD$ per share) | $ 19.49 23.60
Outstanding, end of period (CAD$ per share) | $ $ 15.00 $ 16.56