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Other assets - Deferred financing costs (Details) (CAD)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Deferred financing costs [Abstract]    
Cost 15,536,000 12,747,000
Accumulated Amortization 11,723,000 7,397,000
Net Book Value 3,813,000 5,350,000
Amortization of deferred financing costs 4,326,000 1,623,000
Interest expense
    
Deferred financing costs [Abstract]    
Amortization of deferred financing costs 4,326,000 1,623,000
Revolving Facilities | Credit facilities
    
Deferred financing costs [Abstract]    
Cost 6,881,000  
Accumulated Amortization 5,994,000  
Net Book Value 887,000  
Revolving Facilities | Credit facilities
    
Deferred financing costs [Abstract]    
Cost   5,861,000
Accumulated Amortization   5,233,000
Net Book Value   628,000
Financing fees incurred in connection with debt modification 1,020,000 439,000
Series 1 Debentures | Corporate debentures
    
Deferred financing costs [Abstract]    
Cost 8,655,000 6,886,000
Accumulated Amortization 5,729,000 2,164,000
Net Book Value 2,926,000 4,722,000
Financing fees incurred in connection with debt issuance 1,769,000 0
Unamortized deferred financing costs expensed upon redemption of notes 2,737,000