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v3.20.1

Asset retirement obligations (Tables) | 12 Months Ended
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Dec. 31, 2019
Disclosure of Asset Retirement Obligations [abstract] |
Summary of Asset Retirement Obligations |
| Turkey |  | Canada |  | Greece |  | Romania |  | Brazil |  | Total |
At January 1, 2019 | $ | 36,479 |  | $ | 12,215 |  | $ | 40,069 |  | $ | 1,364 |  | $ | 4,016 |  | $ | 94,143 |
Accretion during the year | 981 |  | 316 |  | 1,090 |  | 39 |  | 106 |  | 2,532 |
Revisions to estimate | 2,330 |  | 107 |  | 3,704 |  | 130 |  | — |  | 6,271 |
Settlements | (594 | ) | — |  | (2,213 | ) | — |  | — |  | (2,807 | )
Reclassified to liabilities associated with assets held for sale | — |  | — |  | — |  | — |  | (4,122 | ) | (4,122 | )
At December 31, 2019 | 39,196 |  | 12,638 |  | 42,650 |  | 1,533 |  | — |  | 96,017 |
Less: Current portion | — |  | — |  | (1,782 | ) | — |  | — |  | (1,782 | )
Long term portion | $ | 39,196 |  | $ | 12,638 |  | $ | 40,868 |  | $ | 1,533 |  | $ | — |  | $ | 94,235 |
Estimated undiscounted amount | $ | 48,064 |  | $ | 14,998 |  | $ | 56,467 |  | $ | 2,287 |  | $ | 4,416 |  | $ | 126,232 |
| 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 |
Summary of Present Value of Estimated Future Net Cash Outflows |
| Turkey | Canada | Greece | Romania | Brazil
| % | % | % | % | %
At December 31, 2019 |  |  |  |  |
Inflation rate | 1.8 | 1.8 | 1.7 to 1.9 | 1.9 | 1.6
Discount rate | 1.9 | 1.9 | 1.7 to 2.3 | 2.3 | 1.6
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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