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Share Capital (Schedule of Stock Options Range for Outstanding and Exercisable Shares) (Details)
Dec. 31, 2018
CAD ($)
shares
year
Dec. 31, 2018
USD ($)
shares
year
Dec. 31, 2017
CAD ($)
shares
Dec. 31, 2016
CAD ($)
shares
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]        
Number of options outstanding (in shares) | shares 6,655,455 6,655,455 10,429,345 9,511,636
Outstanding weighted average exercise price (CAD per share) $ 7.38   $ 7.94 $ 10.87
Weighted average remaining contractual life of options outstanding (years) | year 2.65 2.65    
Number of options exercisable (in shares) | shares 4,737,738 4,737,738    
Exercisable weighted average exercise price (CAD per share)) $ 7.79      
$0.82 - $3.00        
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]        
Number of options outstanding (in shares) | shares 213,108 213,108    
Outstanding weighted average exercise price (CAD per share) $ 2.67      
Weighted average remaining contractual life of options outstanding (years) | year 0.04 0.04    
Number of options exercisable (in shares) | shares 213,108 213,108    
Exercisable weighted average exercise price (CAD per share)) $ 2.67      
$3.01 - $7.00        
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]        
Number of options outstanding (in shares) | shares 2,668,070 2,668,070    
Outstanding weighted average exercise price (CAD per share) $ 4.97      
Weighted average remaining contractual life of options outstanding (years) | year 4.52 4.52    
Number of options exercisable (in shares) | shares 1,136,011 1,136,011    
Exercisable weighted average exercise price (CAD per share)) $ 4.18      
$7.01 - $11.00        
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]        
Number of options outstanding (in shares) | shares 3,159,640 3,159,640    
Outstanding weighted average exercise price (CAD per share) $ 8.24      
Weighted average remaining contractual life of options outstanding (years) | year 1.66 1.66    
Number of options exercisable (in shares) | shares 2,773,982 2,773,982    
Exercisable weighted average exercise price (CAD per share)) $ 8.05      
$11.01 - $15.00        
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]        
Number of options outstanding (in shares) | shares 249,777 249,777    
Outstanding weighted average exercise price (CAD per share) $ 13.15      
Weighted average remaining contractual life of options outstanding (years) | year 0.67 0.67    
Number of options exercisable (in shares) | shares 249,777 249,777    
Exercisable weighted average exercise price (CAD per share)) $ 13.15      
$15.01 - $19.00        
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]        
Number of options outstanding (in shares) | shares 364,860 364,860    
Outstanding weighted average exercise price (CAD per share) $ 16.42      
Weighted average remaining contractual life of options outstanding (years) | year 0.56 0.56    
Number of options exercisable (in shares) | shares 364,860 364,860    
Exercisable weighted average exercise price (CAD per share)) $ 16.42      
Bottom of range [member] | $0.82 - $3.00        
Disclosure of range of exercise prices of outstanding share options [line items]        
Exercise price of outstanding share options   $ 0.82    
Bottom of range [member] | $3.01 - $7.00        
Disclosure of range of exercise prices of outstanding share options [line items]        
Exercise price of outstanding share options   3.01    
Bottom of range [member] | $7.01 - $11.00        
Disclosure of range of exercise prices of outstanding share options [line items]        
Exercise price of outstanding share options   7.011    
Bottom of range [member] | $11.01 - $15.00        
Disclosure of range of exercise prices of outstanding share options [line items]        
Exercise price of outstanding share options   11.01    
Bottom of range [member] | $15.01 - $19.00        
Disclosure of range of exercise prices of outstanding share options [line items]        
Exercise price of outstanding share options   15.01    
Bottom of range [member] | $19.01 - $23.00        
Disclosure of range of exercise prices of outstanding share options [line items]        
Exercise price of outstanding share options   19.01    
Top of range [member] | $0.82 - $3.00        
Disclosure of range of exercise prices of outstanding share options [line items]        
Exercise price of outstanding share options   3.00    
Top of range [member] | $3.01 - $7.00        
Disclosure of range of exercise prices of outstanding share options [line items]        
Exercise price of outstanding share options   7.00    
Top of range [member] | $7.01 - $11.00        
Disclosure of range of exercise prices of outstanding share options [line items]        
Exercise price of outstanding share options   11.00    
Top of range [member] | $11.01 - $15.00        
Disclosure of range of exercise prices of outstanding share options [line items]        
Exercise price of outstanding share options   15.00    
Top of range [member] | $15.01 - $19.00        
Disclosure of range of exercise prices of outstanding share options [line items]        
Exercise price of outstanding share options   19.00    
Top of range [member] | $19.01 - $23.00        
Disclosure of range of exercise prices of outstanding share options [line items]        
Exercise price of outstanding share options   $ 23.00