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Asset retirement obligations (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure of asset retirement obligations [abstract] |
Summary of Asset Retirement Obligations |
| Turkey |  | Canada |  | Greece |  | Romania |  | Brazil |  | Total |
At January 1, 2018 | $ | 37,321 |  | $ | 9,453 |  | $ | 47,461 |  | $ | 1,405 |  | $ | 4,044 |  | $ | 99,684 |
Accretion during the year | 896 |  | — |  | 1,035 |  | 36 |  | 71 |  | 2,038 |
Revisions to estimate | (1,117 | ) | 2,762 |  | (3,512 | ) | (77 | ) | (99 | ) | (2,043 | )
Settlements | (621 | ) | — |  | (4,915 | ) | — |  | — |  | (5,536 | )
At December 31, 2018 | 36,479 |  | 12,215 |  | 40,069 |  | 1,364 |  | 4,016 |  | 94,143 |
Less: Current portion | — |  | — |  | (824 | ) | — |  | — |  | (824 | )
Long term portion | 36,479 |  | 12,215 |  | 39,245 |  | 1,364 |  | 4,016 |  | 93,319 |
Estimated undiscounted amount | $ | 48,454 |  | $ | 14,989 |  | $ | 65,274 |  | $ | 2,335 |  | $ | 4,121 |  | $ | 135,173 |
| Turkey |  | Canada |  | Greece |  | Romania |  | Brazil |  | Total |
At January 1, 2017 | $ | 36,196 |  | $ | — |  | $ | 48,131 |  | $ | 1,359 |  | $ | 4,092 |  | $ | 89,778 |
Acquired during the year | — |  | 9,453 |  | — |  | — |  | — |  | 9,453 |
Accretion during the year | 913 |  | — |  | 1,025 |  | 36 |  | 32 |  | 2,006 |
Revisions to estimate | 502 |  | — |  | 1,112 |  | 10 |  | (80 | ) | 1,544 |
Settlements | (290 | ) | — |  | (2,807 | ) | — |  | — |  | (3,097 | )
At December 31, 2017 | 37,321 |  | 9,453 |  | 47,461 |  | 1,405 |  | 4,044 |  | 99,684 |
Less: Current portion | — |  | — |  | (3,489 | ) | — |  | — |  | (3,489 | )
Long term portion | 37,321 |  | 9,453 |  | 43,972 |  | 1,405 |  | 4,044 |  | 96,195 |
Estimated undiscounted amount | $ | 49,257 |  | $ | 12,286 |  | $ | 71,591 |  | $ | 2,340 |  | $ | 4,117 |  | $ | 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:
| Turkey | Canada | Greece | Romania | Brazil |
| % | % | % | % | % |
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 | 2.3 to 2.5 | 2.3 to 2.5 | 1.5 to 3.0 | 2.7 | 1.8 |
At December 31, 2018 |  |  |  |  |
Inflation rate | 2.2 to 2.3 | 2.2 to 2.3 | 2.2 to 2.3 | 2.2 to 2.3 | 2.2 to 2.3 |
Discount rate | 2.7 | 2.7 | 2.5 to 2.9 | 2.9 | 2.6 |

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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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