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Earnings / Loss per share (Tables)
12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Schedule of Earnings / (Loss) per share
    2016   2017   2018
Income / (Loss) :            
Net income / (loss) $ (154,228) $ (9,771) $ 58,397
              
             
Basic earnings / (loss) per share:            
Weighted average common shares outstanding, basic   47,574,454   63,034,394   77,061,227
                         Basic earnings / (loss) per share $ (3.24) $ (0.16) $ 0.76
             
Effect of dilutive securities:            
Dillutive effect of non vested shares   -   -   264,884
Weighted average common shares outstanding, diluted   47,574,454   63,034,394   77,326,111
             
                         Diluted earnings / (loss) per share $ (3.24) $ (0.16) $ 0.76