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General information and significant accounting policies - Going concern (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 22, 2024
USD ($)
Dec. 31, 2023
USD ($)
vessel
Dec. 31, 2022
USD ($)
vessel
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Disclosure of attribution of expenses by nature to their function [line items]          
Reduction of carrying amount of our outstanding debt and lease obligations | $   $ 343,800      
Cash and cash equivalents | $   355,551 $ 376,870 $ 230,415 $ 187,511
Undrawn borrowing facilities | $   $ 288,200      
Number of vessels | vessel   1      
Repayments and Commitments to Repay Long-Term Debt and Lease Obligations          
Disclosure of attribution of expenses by nature to their function [line items]          
Number of vessels | vessel   24      
Vessels          
Disclosure of attribution of expenses by nature to their function [line items]          
Number of unencumbered vessels | vessel   14      
Number of vessels | vessel   111 113    
Vessels | Repayments and Commitments to Repay Long-Term Debt and Lease Obligations          
Disclosure of attribution of expenses by nature to their function [line items]          
Repayments of borrowings and commitments to repay borrowings | $ $ 380,200