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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, 2021 | Dec. 31, 2020
Disclosure of Asset Retirement Obligations [line items] |  |
Beginning Balance | $ 111,378 | $ 96,017
Acquired during the year | 3,300 |
Accretion during the year | 1,412 | 1,945
Revisions to estimate | 21,678 | 15,769
Settlements | (2,313) | (2,301)
Disposal |  | (52)
Ending Balance | 135,455 | 111,378
Less: Current portion | (4,088) | (4,701)
Long term portion | 131,367 | 106,677
Estimated undiscounted amount | 177,586 | 138,687
Turkey |  |
Disclosure of Asset Retirement Obligations [line items] |  |
Beginning Balance | 44,816 | 39,196
Acquired during the year | 0 |
Accretion during the year | 608 | 753
Revisions to estimate | 10,209 | 5,539
Settlements | (1,039) | (672)
Disposal |  | 0
Ending Balance | 54,594 | 44,816
Less: Current portion | 0 | 0
Long term portion | 54,594 | 44,816
Estimated undiscounted amount | 71,404 | 56,752
Canada |  |
Disclosure of Asset Retirement Obligations [line items] |  |
Beginning Balance | 12,961 | 12,638
Acquired during the year | 3,300 |
Accretion during the year | 131 | 243
Revisions to estimate | (554) | 80
Settlements | 0 | 0
Disposal |  | 0
Ending Balance | 15,838 | 12,961
Less: Current portion | 0 | 0
Long term portion | 15,838 | 12,961
Estimated undiscounted amount | 18,416 | 14,218
Greece |  |
Disclosure of Asset Retirement Obligations [line items] |  |
Beginning Balance | 51,940 | 42,650
Acquired during the year | 0 |
Accretion during the year | 649 | 863
Revisions to estimate | 220 | 10,056
Settlements | (1,274) | (1,629)
Disposal |  | 0
Ending Balance | 51,535 | 51,940
Less: Current portion | (4,088) | (4,701)
Long term portion | 47,447 | 47,239
Estimated undiscounted amount | 68,704 | 65,564
Romania |  |
Disclosure of Asset Retirement Obligations [line items] |  |
Beginning Balance | 1,661 | 1,533
Acquired during the year | 0 |
Accretion during the year | 24 | 34
Revisions to estimate | 11,803 | 94
Settlements | 0 | 0
Disposal |  | 0
Ending Balance | 13,488 | 1,661
Less: Current portion | 0 | 0
Long term portion | 13,488 | 1,661
Estimated undiscounted amount | 19,062 | 2,153
Brazil |  |
Disclosure of Asset Retirement Obligations [line items] |  |
Beginning Balance | 0 | 0
Acquired during the year | 0 |
Accretion during the year | 0 | 52
Revisions to estimate | 0 | 0
Settlements | 0 | 0
Disposal |  | (52)
Ending Balance | 0 | 0
Less: Current portion | 0 | 0
Long term portion | 0 | 0
Estimated undiscounted amount | $ 0 | $ 0

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- Definition Asset Retirement Obligations + References No definition available. + Details
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- Definition Asset retirement obligations, accretion expense during the year. + References No definition available. + Details
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