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Voyage revenues: (Tables)
6 Months Ended
Jun. 30, 2020
Revenue from Contract with Customer [Abstract]  
Voyage Revenues (Table)

 

         
  Six months ended June 30,
    2019   2020
         
Time charters $ 176,709 $ 125,619
Voyage charters   145,443   181,781
Pool revenues          2,130           (404)
  $   324,282 $   306,996