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Accounts Receivable (Details) - CAD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Trade And Other Receivables [Abstract]    
Trade receivables $ 321,638 $ 392,865
GST/VAT receivables 4,614 3,711
Other receivables 1,792 5,774
Total $ 328,044 $ 402,350