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Other assets - Intangible assets (Details) (CAD)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]    
Cost 23,063 28,710
Accumulated Amortization 16,020 16,647
Net Book Value 7,043 12,063
Internally developed computer software capitalized during the period 2,826 4,305
Amortization of intangible assets 3,276 3,686
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2014 3,003  
2015 2,198  
2016 1,255  
2017 587  
Net Book Value 7,043 12,063
Customer relationships and backlog
    
Finite-Lived Intangible Assets [Line Items]    
Cost   4,442
Accumulated Amortization   1,960
Net Book Value   2,482
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
Net Book Value   2,482
Other intangible assets
    
Finite-Lived Intangible Assets [Line Items]    
Cost 350 2,364
Accumulated Amortization 350 1,523
Net Book Value 0 841
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
Net Book Value 0 841
Internal-use software
    
Finite-Lived Intangible Assets [Line Items]    
Cost 22,713 19,887
Accumulated Amortization 15,670 12,425
Net Book Value 7,043 7,462
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
Net Book Value 7,043 7,462
Patents
    
Finite-Lived Intangible Assets [Line Items]    
Cost   2,017
Accumulated Amortization   739
Net Book Value   1,278
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
Net Book Value   1,278