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Stock-based compensation - Performance and deferred stock unit plan (Details) - CAD
12 Months Ended
Jul. 01, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 02, 2015
Performance restricted share units (PSUs)        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Beginning balance (in shares)   423,592 66,172  
Granted/issued (in shares)   343,706 357,420  
Forfeited (in shares)   (27,998)    
Ending balance (in shares)   739,300 423,592  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Intrinsic Value, Amount Per Share [Abstract]        
Outstanding, beginning of period (CAD per unit)   CAD 4.86 CAD 8.50  
Granted/Issued, Weighted average exercise price (CAD per unit)   4.97 4.19  
Forfeited, Weighted average exercise price (CAD per unit)   4.52    
Outstanding, end of period (CAD per unit)   CAD 4.84 CAD 4.86  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]        
Risk-free interest rate   0.52% 0.47%  
Expected volatility   43.30% 41.64%  
Performance restricted share unit plan | Performance restricted share units (PSUs)        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Intrinsic Value, Amount Per Share [Abstract]        
Award vesting period 3 years      
July 2014 grant | Performance restricted share units (PSUs)        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Intrinsic Value, Amount Per Share [Abstract]        
Total unrecognized compensation costs related to non-vested non-option share-based payment arrangements   CAD 1,878,000 CAD 1,492,000  
Period for award recognition   1 year 9 months 2 years 3 months  
Deferred share unit plan | Deferred stock units (DSUs)        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]        
Annual fixed remuneration   50.00%    
Liability classified deferred stock unit plan | Deferred stock units (DSUs)        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Beginning balance (in shares)   928,874 530,622  
Granted/issued (in shares)   171,980    
Modified (in shares)     571,569  
Redeemed (in shares)   (158,917) (173,317)  
Ending balance (in shares)   941,937 928,874  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Intrinsic Value, Amount Per Share [Abstract]        
Total unrecognized compensation costs related to non-vested non-option share-based payment arrangements   CAD 0    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]        
Fair market value (CAD per share)   CAD 5.25   CAD 2.42
Award units settled during the period   CAD 488,000 CAD 527,000  
Plan modification payout     445,000  
Liability classified deferred stock unit plan | Deferred stock units (DSUs) | Accrued liabilities        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]        
Current portion of award obligation   0 0  
Liability classified deferred stock unit plan | Deferred stock units (DSUs) | Other liabilities        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]        
Non-current portion of award obligation   CAD 4,945,000 CAD 2,246,000  
Equity classified deferred stock unit plan | Deferred stock units (DSUs)        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Beginning balance (in shares)   0    
Granted/issued (in shares)     401,841  
Modified (in shares)     (571,569)  
Ending balance (in shares)   0 0  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]        
Fair market value (CAD per share)     CAD 3.10  
Modified, Weighted average exercise price (CAD per unit)     CAD 2.58