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Asset retirement obligations - Summary of asset retirement obligations (Details) - USD ($)
$ in Thousands
 12 Months Ended
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