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Voyage revenues (Tables)
12 Months Ended
Dec. 31, 2020
Revenue from Contract with Customer [Abstract]  
Voyage revenues (Table)

 

 

             
    Years ended December 31,
    2018   2019   2020
             
Time charters $ 397,499 $ 373,927 $ 309,503
Voyage charters   253,812   437,779   385,482
Pool revenues   250   9,659   (1,744)
  $                      651,561 $                  821,365 $                  693,241