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Accounts Receivable (Details) - CAD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Trade And Other Receivables [Abstract]    
Trade receivables $ 392,759 $ 236,373
HST/VAT receivables 3,611 3,968
Other receivables 454 2,141
Total $ 396,824 $ 242,482