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Other income (expense) and finance costs - Finance costs (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of other income & finance costs [Line Items]    
Other interest and financing costs $ 2,189 $ 4,131
Senior secured notes redemption premium 0 21,400
Amortization of discount and transaction costs due to early redemption of debt 0 9,700
Interest expense on lease liabilities 1,642 2,003
Asset retirement obligation accretion 1,980 1,388
Finance costs 41,625 71,785
Senior Notes due 2029    
Disclosure of other income & finance costs [Line Items]    
Capitalized interest paid 31,385 11,008
Senior Secured Notes due 2024    
Disclosure of other income & finance costs [Line Items]    
Capitalized interest paid 0 17,014
Term loan    
Disclosure of other income & finance costs [Line Items]    
Capitalized interest paid 0 2,456
Redemption option derivative asset    
Disclosure of other income & finance costs [Line Items]    
Loss on redemption option derivative $ 4,429 $ 2,685