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Financial risk management (Tables) | 12 Months Ended
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Dec. 31, 2017
Financial Instruments [Abstract] |
Schedule of interest rate risk exposure | The Company’s interest rate risk exposure is mainly related to long-term debt obligations.
As at | Dec 31 2017 |  | Dec 31 2016 |
Fixed interest rate debt: |  |
Unsecured notes | $ | 1,188,163 |  | $ | 1,186,424 |
| $ | 1,188,163 |  | $ | 1,186,424 |
Variable interest rate debt: |  |
Egypt limited recourse debt facilities | $ | 241,190 |  | $ | 288,515 |
Other limited recourse debt facilities | 72,918 |  | 81,267 |
| $ | 314,108 |  | $ | 369,782 |
Expected cash flows of financial liabilities by maturity date | The expected cash flows of financial liabilities from the date of the balance sheet to the contractual maturity date are as follows:
As at December 31, 2017 | Carrying amount |  | Contractual cash flows |  |  | 1 year or less |  | 1-3 years |  | 3-5 years |  | More than 5 years |
Trade and other payables 1 | $ | 519,352 |  | $ | 519,352 |  |  | $ | 519,352 |  | $ | — |  | $ | — |  | $ | — |
Finance lease obligations | 204,242 |  | 397,876 |  |  | 31,447 |  | 64,039 |  | 65,618 |  | 236,772 |
Long-term debt 2 | 1,502,271 |  | 2,178,011 |  |  | 121,689 |  | 586,091 |  | 471,831 |  | 998,400 |
Cash flow hedges | 91,014 |  | 105,120 |  |  | 7,114 |  | 17,057 |  | 28,864 |  | 52,085 |
| $ | 2,316,879 |  | $ | 3,200,359 |  |  | $ | 679,602 |  | $ | 667,187 |  | $ | 566,313 |  | $ | 1,287,257 |
1 | Excludes tax and accrued interest.
2 | Contractual cash flows include contractual interest payments related to debt obligations. Interest rates on variable rate debt are based on prevailing rates as at December 31, 2017.

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- Definition The disclosure of how the entity manages its liquidity risk. [Refer: Liquidity risk [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 39 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_39_c&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The disclosure of information that enables users of financial statements to evaluate the nature and extent of risks arising from financial instruments to which the entity is exposed. [Refer: Financial instruments, class [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 31 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_31&doctype=Standard -URIDate 2017-03-09 + Details
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