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Inventories (Tables)
12 Months Ended
Dec. 31, 2017
Inventories [Abstract]  
Schedule of inventories
  
 
 
December 31, 2016
 
 
December 31, 2017
Lubricants
 
$
6,629
 
$
7,604
Bunkers
 
 
7,905
 
 
11,741
Total
 
$
14,534
 
$
19,345