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Other (expense) income and finance costs - Finance costs (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of other income & finance costs [Line Items]    
Other interest and financing costs $ 4,131 $ 4,380
Senior secured notes redemption premium 21,400 6,275
Amortization of discount and transaction costs of senior secured notes and TARCA due to early redemption 9,700 2,286
Interest expense on lease liabilities 2,003 1,934
Asset retirement obligation accretion 1,412 1,893
Finance costs 71,809 50,874
Senior Notes due 2029    
Disclosure of other income & finance costs [Line Items]    
Capitalized interest paid 11,008 0
Senior Secured Notes due 2024    
Disclosure of other income & finance costs [Line Items]    
Capitalized interest paid 17,014 29,486
Term loan    
Disclosure of other income & finance costs [Line Items]    
Capitalized interest paid 2,456 6,380
Redemption option derivative asset    
Disclosure of other income & finance costs [Line Items]    
Redemption option derivative gain (note 16(a)) $ 2,685 $ (1,760)