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Asset retirement obligations - Summary of asset retirement obligations (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of Asset Retirement Obligations [line items]    
Beginning Balance $ 135,455 $ 111,378
Acquired during the year   3,300
Accretion during the year 2,242 1,412
Revisions to estimate (14,311) 21,678
Settlements (3,202) (2,313)
Reclassified to liabilities associated with assets held for sale (10,311)  
Ending Balance 109,873 135,455
Less: Current portion (3,980) (4,088)
Long term portion 105,893 131,367
Estimated undiscounted amount 185,668 177,586
Turkiye    
Disclosure of Asset Retirement Obligations [line items]    
Beginning Balance 54,594 44,816
Acquired during the year   0
Accretion during the year 965 608
Revisions to estimate 161 10,209
Settlements (1,199) (1,039)
Reclassified to liabilities associated with assets held for sale 0  
Ending Balance 54,521 54,594
Less: Current portion 0 0
Long term portion 54,521 54,594
Estimated undiscounted amount 92,673 71,404
Canada    
Disclosure of Asset Retirement Obligations [line items]    
Beginning Balance 15,838 12,961
Acquired during the year   3,300
Accretion during the year 144 131
Revisions to estimate (1,767) (554)
Settlements 0 0
Reclassified to liabilities associated with assets held for sale 0  
Ending Balance 14,215 15,838
Less: Current portion 0 0
Long term portion 14,215 15,838
Estimated undiscounted amount 20,022 18,416
Greece    
Disclosure of Asset Retirement Obligations [line items]    
Beginning Balance 51,535 51,940
Acquired during the year   0
Accretion during the year 871 649
Revisions to estimate (9,266) 220
Settlements (2,003) (1,274)
Reclassified to liabilities associated with assets held for sale 0  
Ending Balance 41,137 51,535
Less: Current portion (3,980) (4,088)
Long term portion 37,157 47,447
Estimated undiscounted amount 72,973 68,704
Romania    
Disclosure of Asset Retirement Obligations [line items]    
Beginning Balance 13,488 1,661
Acquired during the year   0
Accretion during the year 262 24
Revisions to estimate (3,439) 11,803
Settlements 0 0
Reclassified to liabilities associated with assets held for sale (10,311)  
Ending Balance 0 13,488
Less: Current portion 0 0
Long term portion 0 13,488
Estimated undiscounted amount $ 0 $ 19,062