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Voyage revenues (Table) (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]    
Voyage revenues $ 324,282 $ 253,661
Time charters    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Voyage revenues 176,709 152,079
Voyage charters    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Voyage revenues 145,443 99,029
Pool revenues    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Voyage revenues $ 2,130 $ 2,553