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Operating Expenses, Vessel Operating Expenses (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Operating Expense [Abstract]      
Operating expenses $ 71,609 $ 75,944 $ 72,541
Insurance 6,198 6,244 5,785
Total Vessel Operating Expenses $ 77,807 $ 82,188 $ 78,327