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Accounts Receivable (Details) - CAD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Trade And Other Receivables [Abstract]    
Trade receivables $ 392,865 $ 392,759
GST/VAT receivables 3,711 3,611
Other receivables 5,774 454
Total $ 402,350 $ 396,824