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Operating expenses, Vessel Operating Expenses (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Operating expense [Abstract]      
Operating expenses $ 67,846 $ 71,609 $ 75,944
Insurance 5,963 6,198 6,244
Total vessel operating expenses $ 73,809 $ 77,807 $ 82,188