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Trade and other receivables (Tables) | 12 Months Ended
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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.

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