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Time charter revenue (Table) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
OPERATING REVENUES      
Time charter revenue $ 30,890 $ 35,334 $ 37,881
Time charter revenue-related party 126,207 123,944 128,956
Total operating revenue $ 157,097 $ 159,278 $ 166,837