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Vessel Operating Costs (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Vessel Operating Costs      
Crew costs $ 40,019 $ 38,768 $ 36,881
Technical maintenance expenses 16,030 19,342 21,295
Other operating expenses 16,314 17,223 16,622
Total $ 72,363 $ 75,333 $ 74,798