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Operating expenses, Prepaid Expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Operating expense [Abstract]    
Prepaid voyage expenses $ 5,678 $ 2,959
Prepaid vessel operating expenses 2,216 1,828
Other 2,655 1,375
Total prepaid expenses $ 10,550 $ 6,162