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Share-Based Compensation And Other Related Information - Options Outstanding and Exercisable (Details)
Dec. 31, 2018
CAD ($)
shares
month
Dec. 31, 2017
CAD ($)
shares
Dec. 31, 2016
CAD ($)
shares
Disclosure of range of exercise prices of outstanding share options [line items]      
Number Outstanding at Year End (shares) | shares 698,387 936,123 1,310,864
Weighted average remaining contractual life of outstanding share options | month 52.29    
Weighted Average Exercise Price (CAD$ per share) $ 15.00 $ 16.56 $ 16.81
Number Exercisable at Year End (shares) | shares 503,254    
Weighted Average Exercise Price (CAD$ per share) $ 13.92    
$9.76 - $11.57 [member]      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number Outstanding at Year End (shares) | shares 232,883    
Weighted average remaining contractual life of outstanding share options | month 43.08    
Weighted Average Exercise Price (CAD$ per share) $ 10.07    
Number Exercisable at Year End (shares) | shares 232,883    
Weighted Average Exercise Price (CAD$ per share) $ 10.07    
$9.76 - $11.57 [member] | Bottom of range [member]      
Disclosure of range of exercise prices of outstanding share options [line items]      
Exercise price of outstanding share options 9.76    
$9.76 - $11.57 [member] | Top of range [member]      
Disclosure of range of exercise prices of outstanding share options [line items]      
Exercise price of outstanding share options $ 11.57    
$11.58 - $17.01 [member]      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number Outstanding at Year End (shares) | shares 97,043    
Weighted average remaining contractual life of outstanding share options | month 40.16    
Weighted Average Exercise Price (CAD$ per share) $ 12.50    
Number Exercisable at Year End (shares) | shares 97,043    
Weighted Average Exercise Price (CAD$ per share) $ 12.50    
$11.58 - $17.01 [member] | Bottom of range [member]      
Disclosure of range of exercise prices of outstanding share options [line items]      
Exercise price of outstanding share options 11.58    
$11.58 - $17.01 [member] | Top of range [member]      
Disclosure of range of exercise prices of outstanding share options [line items]      
Exercise price of outstanding share options $ 17.01    
$17.02 - $18.53 [member]      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number Outstanding at Year End (shares) | shares 230,811    
Weighted average remaining contractual life of outstanding share options | month 57.74    
Weighted Average Exercise Price (CAD$ per share) $ 17.88    
Number Exercisable at Year End (shares) | shares 81,648    
Weighted Average Exercise Price (CAD$ per share) $ 18.53    
$17.02 - $18.53 [member] | Bottom of range [member]      
Disclosure of range of exercise prices of outstanding share options [line items]      
Exercise price of outstanding share options 17.02    
$17.02 - $18.53 [member] | Top of range [member]      
Disclosure of range of exercise prices of outstanding share options [line items]      
Exercise price of outstanding share options $ 18.53    
$18.54 - $24.90 [member]      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number Outstanding at Year End (shares) | shares 137,650    
Weighted average remaining contractual life of outstanding share options | month 67.28    
Weighted Average Exercise Price (CAD$ per share) $ 20.29    
Number Exercisable at Year End (shares) | shares 91,680    
Weighted Average Exercise Price (CAD$ per share) $ 21.12    
$18.54 - $24.90 [member] | Bottom of range [member]      
Disclosure of range of exercise prices of outstanding share options [line items]      
Exercise price of outstanding share options 18.54    
$18.54 - $24.90 [member] | Top of range [member]      
Disclosure of range of exercise prices of outstanding share options [line items]      
Exercise price of outstanding share options $ 24.90