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Significant Accounting Policies - Revenues (Table) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]      
Voyage revenues $ 651,561 $ 331,976 $ 221,987
Time charters      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Voyage revenues 397,499 240,529 148,012
Voyage charters      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Voyage revenues 253,812 102,977 82,306
Pool revenues      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Voyage revenues $ 250 574 (588)
Address commissions      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Voyage revenues   $ (12,104) $ (7,743)