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Lease obligations - Narrative (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
USD ($)
vessel
Dec. 31, 2022
USD ($)
vessel
Disclosure of Leases [Abstract]    
Expense relating to variable lease payments not included in measurement of lease liabilities $ 83,800 $ 81,900
Expense relating to short-term leases for which recognition exemption has been used 200 200
Potential future lease payments not included in lease liabilities (undiscounted) 51,778 53,500
Lease not yet commenced, amount $ 68,700 $ 132,600
Lease not yet commenced, number of vessel, additions | vessel 1  
Lease not yet commenced, term (in years) 5 years  
Lease not yet commenced, number of vessels | vessel   1