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Long-term debt (Tables) | 12 Months Ended
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Dec. 31, 2017
Financial Instruments [Abstract] |
Schedule of long-term debt |
As at | Dec 31 2017 |  | Dec 31 2016 |
Unsecured notes |  |
(i) 3.25% due December 15, 2019 | $ | 348,060 |  | $ | 347,126 |
(ii) 5.25% due March 1, 2022 | 248,072 |  | 247,685 |
(iii) 4.25% due December 1, 2024 | 296,873 |  | 296,529 |
(iv) 5.65% due December 1, 2044 | 295,158 |  | 295,084 |
| 1,188,163 |  | 1,186,424 |
Egypt limited recourse debt facilities | 241,190 |  | 288,515 |
Other limited recourse debt facilities | 72,918 |  | 81,267 |
Total long-term debt 1 | 1,502,271 |  | 1,556,206 |
Less current maturities 1 | (55,905 | ) | (53,997 | )
| $ | 1,446,366 |  | $ | 1,502,209 |
1 | Long-term debt and current maturities are presented net of discounts and deferred financing fees of $17.8 million as at December 31, 2017 (2016 - $17.8 million).
Schedule of minimum principal payments for long-term debt | The minimum principal payments for long-term debt in aggregate and for each of the five succeeding years are as follows:
| Limited recourse debt facilities |  | Unsecured notes |  | Total |
2018 | $ | 57,072 |  | $ | — |  | $ | 57,072 |
2019 | 60,100 |  | 350,000 |  | 410,100 |
2020 | 62,115 |  | — |  | 62,115 |
2021 | 109,462 |  | — |  | 109,462 |
2022 | 31,279 |  | 250,000 |  | 281,279 |
Thereafter | — |  | 600,000 |  | 600,000 |
| $ | 320,028 |  | $ | 1,200,000 |  | $ | 1,520,028 |

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