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Share Capital (Stock Options) (Details)
 12 Months Ended
Dec. 31, 2019
shares
$ / shares
Dec. 31, 2018
shares
$ / shares
Disclosure of share capital, reserves and other equity interest [Abstract]    
Number of options outstanding | shares 6,655,455 10,429,345
Granted | shares 965,876 1,009,100
Exercised | shares (1,555,989) (1,984,698)
Expired | shares (1,600,080) (2,798,292)
Number of options outstanding | shares 4,465,262 6,655,455
Beginning balance, Weighted average exercise price (cad per share) $ 7.38 $ 7.94
Granted (cad per share) 6.59 6.56
Exercised (cad per share) 5.93 2.40
Expired (cad per share) 10.52 12.70
Ending balance, Weighted average exercise price (cad per share) 6.59 7.38
Exercise price of outstanding share options $ 9.66 $ 5.89