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Earnings / Loss per share (Tables)
 12 Months Ended
Dec. 31, 2017
Earnings / Loss per Share [Abstract]  
Schedule of Earnings / (Loss) per share
 
 
Year ended December 31,
 
 
 
2015
 
 
2016
 
 
2017
Income / (Loss) :
 
 
 
 
 
 
 
 
 
Net income / (loss)
 
$
(458,177
 ) 
$
(154,228
 ) 
$
(9,771
)
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Basic earnings / (loss) per share:
 
 
 
 
 
 
 
 
 
Weighted average common shares outstanding, basic
 
 
39,124,673  
 
 
47,574,454  
 
 
63,034,394  
Basic earnings / (loss) per share
 
$
(11.71)  
 
$
(3.24)  
 
$
(0.16)  
 
 
 
 
 
 
 
 
 
 
Effect of dilutive securities:
 
 
 
 
 
 
 
 
 
Dillutive effect of non vested shares
 
 
                          -   
 
 
                          -   
 
 
                          -   
Weighted average common shares outstanding, diluted
 
 
39,124,673  
 
 
47,574,454  
 
 
63,034,394  
 
 
 
 
 
 
 
 
 
 
Diluted earnings / (loss) per share
 
$
(11.71)
 
$
(3.24)
 
$
(0.16)