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Stock-based compensation - Textuals (Details) - CAD
12 Months Ended
Jul. 01, 2014
Sep. 22, 2010
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares exercised and settled during period       385,880 295,230
Proceeds from options exercised     CAD 82,000 CAD 2,807,000 CAD 1,175,000
Share option plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options outstanding, weighted average remaining life     5 years 5 months 6 years 1 month  
Fair value of options vested during the year     CAD 806,000 CAD 983,000 CAD 1,278,000
Options exercisable     886,220 824,720  
Options exercisable, Weighted average exercise price (in CAD per share)     CAD 6.52 CAD 8.41  
Total compensation costs related to non-vested options not yet recognized     CAD 684,000 CAD 1,223,000  
Options forfeited     287,840 61,480 698,624
Shares exercised and settled during period [1]     30,080 385,880 295,230
Total intrinsic value of options exercised     CAD 16,000 CAD 1,711,000 CAD 524,000
Proceeds from options exercised     CAD 82,000 CAD 1,348,000 1,175,000
Share option plan | Stock options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total compensation costs related to non-vested awards not yet recognized, weighted average recognition period     1 year 8 months 2 years 6 months  
Senior executive stock option plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock options reclassified from equity to a long-term liability   550,000      
Shares exercised and settled during period       291,800  
Total intrinsic value of options exercised       CAD 935,000 0
Proceeds from options exercised       1,459,000 CAD 0
Senior executive stock option plan | Stock options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options forfeited     258,200    
Current portion of award obligation     CAD 0 CAD 22,000  
Liability classified restricted share unit plan | Restricted share units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total compensation costs related to non-vested awards not yet recognized, weighted average recognition period     3 months 9 months  
Service period of award subsequent to year of grant     2 years    
Award vesting period     3 years    
Redeemed (units)     277,707 350,271 154,330
Award units settled during the period     CAD 1,030,000 CAD 2,678,000 CAD 727,000
Fair market value (CAD per share)     CAD 2.42 CAD 3.78  
Total unrecognized compensation costs related to non-vested non-option share-based payment arrangements     CAD 61,000 CAD 641,000  
Liability classified restricted share unit plan | Restricted share units (RSUs) | Accrued liabilities          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Current portion of award obligation     671,000 1,009,000  
Liability classified restricted share unit plan | Restricted share units (RSUs) | Other long-term liabilities          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Non-current portion of award obligation     CAD 0 CAD 770,000  
Equity classified restricted share unit plan | Restricted share units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total compensation costs related to non-vested awards not yet recognized, weighted average recognition period     2 years 1 month 2 years 3 months  
Redeemed (units)     19,798 605  
Total unrecognized compensation costs related to non-vested non-option share-based payment arrangements     CAD 1,877,000 CAD 1,276,000  
Performance restricted share unit plan | Performance restricted share units (PSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period 3 years        
July 2014 Grant | Performance restricted share units (PSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total compensation costs related to non-vested awards not yet recognized, weighted average recognition period     1 year 6 months 2 years 6 months  
Total unrecognized compensation costs related to non-vested non-option share-based payment arrangements     CAD 281,000 CAD 468,000  
July 2015 Grant | Performance restricted share units (PSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total compensation costs related to non-vested awards not yet recognized, weighted average recognition period     2 years 6 months    
Total unrecognized compensation costs related to non-vested non-option share-based payment arrangements     CAD 1,211,000 CAD 0  
Deferred share unit plan | Deferred stock units (DSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percentage of non-officer directors' fixed remuneration in the form of DDSUs (50% or more)     50.00%    
Liability classified deferred stock unit plan | Deferred stock units (DSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Redeemed (units)     173,317 63,886 179,831
Award units settled during the period     CAD 527,000 CAD 557,000 CAD 968,000
Fair market value (CAD per share)     CAD 2.42 CAD 3.78  
Total unrecognized compensation costs related to non-vested non-option share-based payment arrangements     CAD 0    
Liability classified deferred stock unit plan | Deferred stock units (DSUs) | Accrued liabilities          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Current portion of award obligation     0 CAD 408,000  
Liability classified deferred stock unit plan | Deferred stock units (DSUs) | Other long-term liabilities          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Non-current portion of award obligation     2,246,000 CAD 1,597,000  
Pay out to executives     445,000    
Equity classified deferred stock unit plan | Deferred stock units, dividend equivalent rights          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total unrecognized compensation costs related to non-vested non-option share-based payment arrangements     CAD 0    
[1] All stock options exercised resulted in new common shares being issued (note 17(a))