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Interest expense net (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Schedule of Interest Expense [Line Items]    
Amortization of deferred financing costs $ 1,091 $ 969
Interest expense 18,691 21,730
Other interest income (10) (107)
Total interest expense, net 18,681 21,623
Credit Facility    
Schedule of Interest Expense [Line Items]    
Interest on long term debt 8,189 9,826
Convertible debentures    
Schedule of Interest Expense [Line Items]    
Interest on long term debt 3,299 4,318
Finance lease obligations    
Schedule of Interest Expense [Line Items]    
Interest on long term debt 3,184 3,691
Mortgages    
Schedule of Interest Expense [Line Items]    
Interest on long term debt 999 963
Promissory notes    
Schedule of Interest Expense [Line Items]    
Interest on long term debt 664 1,691
Financing obligations    
Schedule of Interest Expense [Line Items]    
Interest on long term debt $ 1,265 $ 272