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Stock-based compensation - Textuals (Details) (CAD)
 12 Months Ended 0 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Share option plan
Dec. 31, 2012
Share option plan
Dec. 31, 2013
Share option plan
Stock options
Dec. 31, 2012
Share option plan
Stock options
Sep. 22, 2010
Senior executive stock option plan
Dec. 31, 2013
Restricted share unit plan
Restricted share units (RSUs)
Dec. 31, 2012
Restricted share unit plan
Restricted share units (RSUs)
Dec. 31, 2013
Restricted share unit plan
Restricted share units (RSUs)
Accrued liabilities
Dec. 31, 2012
Restricted share unit plan
Restricted share units (RSUs)
Accrued liabilities
Dec. 31, 2013
Restricted share unit plan
Restricted share units (RSUs)
Other long-term liabilities
Dec. 31, 2012
Restricted share unit plan
Restricted share units (RSUs)
Other long-term liabilities
Dec. 31, 2013
Directors' deferred share unit plan
Deferred stock units (DSUs)
Dec. 31, 2012
Directors' deferred share unit plan
Deferred stock units (DSUs)
Dec. 31, 2013
Directors' deferred share unit plan
Deferred stock units (DSUs)
Accrued liabilities
Dec. 31, 2013
Directors' deferred share unit plan
Deferred stock units (DSUs)
Other long-term liabilities
Dec. 31, 2012
Directors' deferred share unit plan
Deferred stock units (DSUs)
Other long-term liabilities
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                    
Number shares acquired per each option exercised     1                              
Years from grant date stock options expire         10 years                          
Stock options annual vesting percentage     20.00%                              
Proceeds from stock options exercised 1,175,000 7,000 1,175,000 7,000                            
Total intrinsic value of options exercised     524,000 5,000                            
Options outstanding, weighted average remaining life     6 years 11 months 7 years 3 months                            
Fair value of options vested during the year     1,278,000 1,436,000                            
Number of options exercisable     892,700 1,106,274                            
Options exercisable, weighted average exercise price     8.00 8.59                            
Total compensation costs related to non-vested awards not yet recognized     1,762,000 2,983,000                            
Total compensation costs related to non-vested awards not yet recognized, weighted average recognition period         3 years 2 months 12 days 3 years 8 months 12 days   1 year 3 months 4 days 1 year 6 months 36 days                  
Stock options reclassified from equity to a long-term liability             550,000                      
Compensation cost related to the senior executive stock option plan transferred from additional paid-in capital to the senior executive stock option liability             2,237,000                      
Service period of award subsequent to year of grant               2 years                    
Award vesting period               3 years                    
Current portion of award obligation               1,933,000 503,000 1,933,000 503,000     0 253,000 0    
Non-current portion of award obligation                       1,734,000 1,239,000       3,662,000 1,817,000
Award units settled during the period (units)               154,330 345,679         179,831 63,413      
Award units settled during the period               727,000 1,677,000         968,000 175,000      
Weighted average remaining contractual life of award               1 year 3 months 4 days 1 year 6 months 36 days                  
Fair market value (CAD per share)               6.24           6.24 3.31      
Total unrecognized compensation costs related to non-vested share-based payment arrangements               2,958,000 1,980,000         0        
Percentage of non-officer directors' fixed remuneration in the form of DDSUs (50% or more)                           50.00%        
Number of trading days used to determine weighted average trading price of common shares               5 days           5 days