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Asset retirement obligations - Additional information (Details) € in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020 EUR (€)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Disclosure of Asset Retirement Obligations [line items]
Restricted cash | $		$ 2,097	$ 3,080
Environmental Guarantee Deposit
Disclosure of Asset Retirement Obligations [line items]
Restricted cash | $		$ 2,060	$ 3,080
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	1.87%
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	1.87%

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- Definition

Disclosure of asset retirement obligations [Line Items]

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- Definition

Letters of Guarantee.

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- Definition

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- Definition

The amount of cash and cash equivalents whose use or withdrawal is restricted. [Refer: Cash and cash equivalents]

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_55&doctype=Standard
-URIDate 2020-01-01

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