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Financial risk management (Tables) | 12 Months Ended
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Dec. 31, 2018
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 2018 |  | Dec 31 2017 |
Fixed interest rate debt: |  |
Unsecured notes | $ | 1,189,976 |  | $ | 1,188,163 |
Other limited recourse debt facilities | 161,601 |  | — |
| $ | 1,351,577 |  | $ | 1,188,163 |
Variable interest rate debt: |  |
Egypt limited recourse debt facilities | $ | 101,226 |  | $ | 241,190 |
Other limited recourse debt facilities | 5,483 |  | 72,918 |
| $ | 106,709 |  | $ | 314,108 |
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, 2018 | Carrying amount |  | Contractual cash flows |  |  | 1 year or less |  | 1-3 years |  | 3-5 years |  | More than 5 years |
Trade and other payables 1 | $ | 516,153 |  | $ | 516,153 |  |  | $ | 516,153 |  | $ | — |  | $ | — |  | $ | — |
Finance lease obligations | 198,374 |  | 370,274 |  |  | 32,222 |  | 65,628 |  | 66,201 |  | 206,223 |
Long-term debt 2 | 1,458,286 |  | 2,129,284 |  |  | 453,430 |  | 187,564 |  | 365,200 |  | 1,123,090 |
Cash flow hedges 3 | 105,721 |  | 123,615 |  |  | 7,006 |  | 35,551 |  | 40,130 |  | 40,928 |
| $ | 2,278,534 |  | $ | 3,139,326 |  |  | $ | 1,008,811 |  | $ | 288,743 |  | $ | 471,531 |  | $ | 1,370,241 |
1 | Excludes tax and accrued interest.
2 | Contractual cash flows include contractual interest payments related to debt obligations and finance lease obligations. Interest rates on variable rate debt are based on prevailing rates as at December 31, 2018.
3 | Cash flow hedges includes the impact of discounting and credit valuation adjustments

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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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- Definition Financial instruments [Abstract] + References No definition available. + Details
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