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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, 2019 | Dec. 31, 2018
Disclosure of Asset Retirement Obligations [line items] |  |
Beginning Balance | $ 94,143 | $ 99,684
Accretion during the year | 2,532 | 2,038
Revisions to estimate | 6,271 | (2,043)
Settlements | (2,807) | (5,536)
Reclassified to liabilities associated with assets held for sale | (4,122) |
Ending Balance | 96,017 | 94,143
Less: Current portion | (1,782) | (824)
Long term portion | 94,235 | 93,319
Estimated undiscounted amount | 126,232 | 135,173
Turkey |  |
Disclosure of Asset Retirement Obligations [line items] |  |
Beginning Balance | 36,479 | 37,321
Accretion during the year | 981 | 896
Revisions to estimate | 2,330 | (1,117)
Settlements | (594) | (621)
Reclassified to liabilities associated with assets held for sale | 0 |
Ending Balance | 39,196 | 36,479
Less: Current portion | 0 | 0
Long term portion | 39,196 | 36,479
Estimated undiscounted amount | 48,064 | 48,454
Canada |  |
Disclosure of Asset Retirement Obligations [line items] |  |
Beginning Balance | 12,215 | 9,453
Accretion during the year | 316 | 0
Revisions to estimate | 107 | 2,762
Settlements | 0 | 0
Reclassified to liabilities associated with assets held for sale | 0 |
Ending Balance | 12,638 | 12,215
Less: Current portion | 0 | 0
Long term portion | 12,638 | 12,215
Estimated undiscounted amount | 14,998 | 14,989
Greece |  |
Disclosure of Asset Retirement Obligations [line items] |  |
Beginning Balance | 40,069 | 47,461
Accretion during the year | 1,090 | 1,035
Revisions to estimate | 3,704 | (3,512)
Settlements | (2,213) | (4,915)
Reclassified to liabilities associated with assets held for sale | 0 |
Ending Balance | 42,650 | 40,069
Less: Current portion | (1,782) | (824)
Long term portion | 40,868 | 39,245
Estimated undiscounted amount | 56,467 | 65,274
Romania |  |
Disclosure of Asset Retirement Obligations [line items] |  |
Beginning Balance | 1,364 | 1,405
Accretion during the year | 39 | 36
Revisions to estimate | 130 | (77)
Settlements | 0 | 0
Reclassified to liabilities associated with assets held for sale | 0 |
Ending Balance | 1,533 | 1,364
Less: Current portion | 0 | 0
Long term portion | 1,533 | 1,364
Estimated undiscounted amount | 2,287 | 2,335
Brazil |  |
Disclosure of Asset Retirement Obligations [line items] |  |
Beginning Balance | 4,016 | 4,044
Accretion during the year | 106 | 71
Revisions to estimate | 0 | (99)
Settlements | 0 | 0
Reclassified to liabilities associated with assets held for sale | (4,122) |
Ending Balance | 0 | 4,016
Less: Current portion | 0 | 0
Long term portion | 0 | 4,016
Estimated undiscounted amount | $ 4,416 | $ 4,121

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- Definition Asset Retirement Obligations + References No definition available. + Details
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