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Other income (expense) and finance costs (gains) - Finance costs (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of other income & finance costs [Line Items]    
Other interest and financing costs $ 9,835 $ 2,189
Interest expense on lease liabilities 1,747 1,642
Asset retirement obligation accretion 4,291 1,980
Total finance costs 49,926 41,625
Less: capitalized interest (17,087) 0
Finance costs 32,839 41,625
Senior Notes due 2029    
Disclosure of other income & finance costs [Line Items]    
Interest cost 31,486 31,385
Term Facility    
Disclosure of other income & finance costs [Line Items]    
Interest cost 4,526 0
Redemption option derivative asset    
Disclosure of other income & finance costs [Line Items]    
(Gain) loss on redemption option derivative $ (1,959) $ 4,429