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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%