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Trade and other receivables (Tables)
 12 Months Ended
Dec. 31, 2017
Subclassifications of assets, liabilities and equities [abstract]  
Schedule of trade and other receivables
As at
Dec 31
2017

Dec 31
2016

Trade
$
429,582

$
335,606

Value-added and other tax receivables
36,584

63,738

Egypt gas contract recoveries(a)
24,466

41,578

Other
46,004

58,681

 
$
536,636

$
499,603


a) Egypt gas contract recoveries:
The natural gas supply agreement in Egypt has a mechanism whereby the Company is partially compensated when gas delivery shortfalls exceed a certain threshold. The receivable is secured by a combination of funds held in escrow and a bank guarantee.