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Asset retirement obligations (Tables) | 12 Months Ended
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Dec. 31, 2017
Text block1 [abstract] |
Summary of Asset Retirement Obligations |
|  | Greece |  |  | Brazil |  |  | Turkey |  |  | Romania |  |  | Canada |  |  | Total |
|  | $ |  |  | $ |  |  | $ |  |  | $ |  |  | $ |  |  | $ |
At January 1, 2017 |  |  | 48,131 |  |  |  | 4,092 |  |  |  | 36,196 |  |  |  | 1,359 |  |  |  | - |  |  |  | 89,778 |
Acquired during the year |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 9,453 |  |  |  | 9,453 |
Accretion during the year |  |  | 1,025 |  |  |  | 32 |  |  |  | 913 |  |  |  | 36 |  |  |  | - |  |  |  | 2,006 |
Revisions to estimate of obligation |  |  | 1,112 |  |  |  | (80 | ) |  |  | 502 |  |  |  | 10 |  |  |  | - |  |  |  | 1,544 |
Settlements |  |  | (2,807 | ) |  |  | - |  |  |  | (290 | ) |  |  | - |  |  |  | - |  |  |  | (3,097 | )
At December 31, 2017 |  |  | 47,461 |  |  |  | 4,044 |  |  |  | 37,321 |  |  |  | 1,405 |  |  |  | 9,453 |  |  |  | 99,684 |
Less: Current portion |  |  | (3,489 | ) |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | (3,489 | )
Long term portion |  |  | 43,972 |  |  |  | 4,044 |  |  |  | 37,321 |  |  |  | 1,405 |  |  |  | 9,453 |  |  |  | 96,195 |
Estimated undiscounted amount |  |  | 71,591 |  |  |  | 4,117 |  |  |  | 49,257 |  |  |  | 2,340 |  |  |  | 12,286 |  |  |  | 139,591 |
Summary of Present Value of Estimated Future Net Cash Outflows | The provision is calculated as the present value of estimated future net cash outflows based on the following key assumptions:
|  | Greece |  |  | Brazil |  |  | Turkey |  |  | Romania |  |  | Canada |
|  | % |  |  | % |  |  | % |  |  | % |  |  | % |
At December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Inflation rate |  |  | 2.0 to 2.4 |  |  |  | 2.0 to 2.4 |  |  |  | 2.0 to 2.4 |  |  |  | 2.0 to 2.4 |  |  |  | - |
Discount rate |  |  | 1.5 to 3.0 |  |  |  | 0.8 |  |  |  | 2.3 to 2.5 |  |  |  | 2.7 |  |  |  | - |
At December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Inflation rate |  |  | 2.0 to 2.2 |  |  |  | 2.0 to 2.2 |  |  |  | 2.0 to 2.2 |  |  |  | 2.0 to 2.2 |  |  |  | 2.0 to 2.2 |
Discount rate |  |  | 1.5 to 3.0 |  |  |  | 1.8 |  |  |  | 2.3 to 2.5 |  |  |  | 2.7 |  |  |  | 2.3 to 2.5 |

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- Definition Disclosure of detailed information about asset retirement obligations explanatory. + References No definition available. + Details
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- Definition Disclosure of key assumptions used to calculate the present value of estimated future net cash outflows from asset retirement obligations explanatory. + References No definition available. + Details
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- Definition Text block1 [abstract] + References No definition available. + Details
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