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Voyage revenues (Tables)
6 Months Ended
Jun. 30, 2021
Revenue from Contract with Customer [Abstract]  
Voyage Revenues (Table)

 

         
  Six months ended June 30,
    2020   2021
         
Time charters $ 125,619 $ 248,067
Voyage charters   181,781   268,191
Pool revenues          (404)           (4,380)
  $   306,996 $   511,878