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Commitments - Future minimum lease revenues receivable under non-cancellable operating leases (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Disclosure of maturity analysis of operating lease payments [line items]    
Total $ 7,699 $ 6,675
Not later than one year [member]    
Disclosure of maturity analysis of operating lease payments [line items]    
Total $ 7,699 $ 6,675