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Finance costs (gains) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of other income & finance costs [Line Items]    
Other interest and financing costs $ 3,288 $ 9,835
Asset retirement obligation accretion 4,869 4,291
Interest expense on lease liabilities 1,657 1,747
Total finance costs 56,888 49,926
Less: capitalized interest (33,839) (17,087)
Finance costs 23,049 32,839
Senior Notes    
Disclosure of other income & finance costs [Line Items]    
Interest cost 31,502 31,486
Term Facility    
Disclosure of other income & finance costs [Line Items]    
Interest cost 17,512 4,526
Redemption option derivative asset    
Disclosure of other income & finance costs [Line Items]    
Change in fair value of redemption option derivative (Note 16) $ (1,940) $ 1,959