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Asset retirement obligations - Additional information (Details) € in Thousands, $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2022 EUR (€) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Disclosure of Asset Retirement Obligations [line items] |  |  |
Restricted cash | $ |  | $ 2,033 | $ 2,674
Environmental Guarantee Deposit |  |  |
Disclosure of Asset Retirement Obligations [line items] |  |  |
Restricted cash | $ |  | $ 1,979 | $ 2,614
Greece | 50.0 million Letter of Credit |  |  |
Disclosure of Asset Retirement Obligations [line items] |  |  |
Letter of guarantee | € | € 50,000 |  |
Letter of guarantee expiration date | Jul. 26, 2026 |  |
Letter of guarantee annual fee | 1.02% |  |
Greece | 7.5 million Letter of Guarantee |  |  |
Disclosure of Asset Retirement Obligations [line items] |  |  |
Letter of guarantee | € | € 7,500 |  |
Letter of guarantee expiration date | Jul. 26, 2026 |  |
Letter of guarantee annual fee | 1.07% |  |

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- Definition The amount of cash and cash equivalents whose use or withdrawal is restricted. [Refer: Cash and cash equivalents] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_55&doctype=Standard -URIDate 2022-03-24 + Details
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