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Cash and cash equivalents (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Cash and cash equivalents [abstract]        
Cash at banks $ 353,805 $ 375,229    
Cash on vessels 1,746 1,641    
Total cash $ 355,551 $ 376,870 $ 230,415 $ 187,511