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Share Capital and Employee Compensation Plans - Additional Information (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
shares
year
$ / shares
Dec. 31, 2017
CAD ($)
shares
year
Dec. 31, 2016
USD ($)
shares
year
Dec. 31, 2016
CAD ($)
shares
year
Dec. 31, 2017
CAD ($)
year
shares
Disclosure of non-adjusting events after reporting period [line items]          
Number of shares issued to former employee (shares) 0 0 100,000 100,000  
Holding period for shares awarded | year         2
Number of share options granted in share-based payment arrangement 91,945 91,945 45,705 45,705  
Expected volatility, share options granted 42.00% 42.00% 54.00% 54.00%  
Weighted average exercise price of share options granted in share-based payment arrangement | $   $ 18.64   $ 23.61  
Weighted average fair value at measurement date, share options granted | $       $ 8.94 $ 5.30
Number of shares issued in lieu of directors fees (shares) 12,291 12,291 14,434 14,434  
Directors' remuneration expense | $ $ 200   $ 200    
Share-based compensation | $ $ 3,077   $ 3,826    
Number of shares authorised (shares)         200,000,000
Par value per common share | $ / shares $ 0        
Restricted Shares [Member]          
Disclosure of non-adjusting events after reporting period [line items]          
Granted (shares) 123,113 123,113 82,338 82,338  
Bottom of range [member]          
Disclosure of non-adjusting events after reporting period [line items]          
Risk-free interest rate 2.00% 2.00% 1.20% 1.20%  
Option life, share options granted | year 3.5 3.5 3.5 3.5  
Expected dividend as percentage, share options granted 2.40% 2.40% 1.40% 1.40%  
Top of range [member]          
Disclosure of non-adjusting events after reporting period [line items]          
Risk-free interest rate 2.40% 2.40% 1.30% 1.30%  
Option life, share options granted | year 4.5 4.5 4.5 4.5  
Expected dividend as percentage, share options granted 2.80% 2.80% 1.70% 1.70%