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Assets held for sale (Details) - CAD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2018
Property, Plant and Equipment [Line Items]    
Assets held for sale $ 5,642 $ 672
Disposal group, held-for-sale, not discontinued operations    
Property, Plant and Equipment [Line Items]    
Assets held for sale 5,642 $ 672
Impairment of equipment assets held for sale $ 1,621