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Asset retirement obligations - Summary of asset retirement obligations (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Disclosure of Asset Retirement Obligations [line items] |  |
Beginning Balance | $ 96,017 | $ 94,143
Accretion during the year | 1,945 | 2,532
Revisions to estimate | 15,769 | 6,271
Settlements | (2,301) | (2,807)
Disposal | (52) |
Reclassified to liabilities associated with assets held for sale |  | (4,122)
Ending Balance | 111,378 | 96,017
Less: Current portion | (4,701) | (1,782)
Long term portion | 106,677 | 94,235
Estimated undiscounted amount | 138,687 | 126,232
Turkey |  |
Disclosure of Asset Retirement Obligations [line items] |  |
Beginning Balance | 39,196 | 36,479
Accretion during the year | 753 | 981
Revisions to estimate | 5,539 | 2,330
Settlements | (672) | (594)
Disposal | 0 |
Reclassified to liabilities associated with assets held for sale |  | 0
Ending Balance | 44,816 | 39,196
Less: Current portion | 0 | 0
Long term portion | 44,816 | 39,196
Estimated undiscounted amount | 56,752 | 48,064
Canada |  |
Disclosure of Asset Retirement Obligations [line items] |  |
Beginning Balance | 12,638 | 12,215
Accretion during the year | 243 | 316
Revisions to estimate | 80 | 107
Settlements | 0 | 0
Disposal | 0 |
Reclassified to liabilities associated with assets held for sale |  | 0
Ending Balance | 12,961 | 12,638
Less: Current portion | 0 | 0
Long term portion | 12,961 | 12,638
Estimated undiscounted amount | 14,218 | 14,998
Greece |  |
Disclosure of Asset Retirement Obligations [line items] |  |
Beginning Balance | 42,650 | 40,069
Accretion during the year | 863 | 1,090
Revisions to estimate | 10,056 | 3,704
Settlements | (1,629) | (2,213)
Disposal | 0 |
Reclassified to liabilities associated with assets held for sale |  | 0
Ending Balance | 51,940 | 42,650
Less: Current portion | (4,701) | (1,782)
Long term portion | 47,239 | 40,868
Estimated undiscounted amount | 65,564 | 56,467
Romania |  |
Disclosure of Asset Retirement Obligations [line items] |  |
Beginning Balance | 1,533 | 1,364
Accretion during the year | 34 | 39
Revisions to estimate | 94 | 130
Settlements | 0 | 0
Disposal | 0 |
Reclassified to liabilities associated with assets held for sale |  | 0
Ending Balance | 1,661 | 1,533
Less: Current portion | 0 | 0
Long term portion | 1,661 | 1,533
Estimated undiscounted amount | 2,153 | 2,287
Brazil |  |
Disclosure of Asset Retirement Obligations [line items] |  |
Beginning Balance | 0 | 4,016
Accretion during the year | 52 | 106
Revisions to estimate | 0 | 0
Settlements | 0 | 0
Disposal | (52) |
Reclassified to liabilities associated with assets held for sale |  | (4,122)
Ending Balance | 0 | 0
Less: Current portion | 0 | 0
Long term portion | 0 | 0
Estimated undiscounted amount | $ 0 | $ 4,416

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