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Earnings / Loss per share (Tables)
12 Months Ended
Dec. 31, 2019
Earnings Per Share [Abstract]  
Schedule of Earnings / (Loss) per share
Years ended December 31, 
    2017   2018   2019
Income / (Loss) :            
Net income / (loss) $ (9,771) $ 58,397 $ (16,201)
              
             
Basic earnings / (loss) per share:            
Weighted average common shares outstanding, basic   63,034,394   77,061,227   93,735,549
                             Basic earnings / (loss) per share $ (0.16) $ 0.76 $ (0.17)
             
Effect of dilutive securities:            
Dillutive effect of non vested shares   -   264,884   -
Weighted average common shares outstanding, diluted   63,034,394   77,326,111   93,735,549
             
                             Diluted earnings / (loss) per share $ (0.16) $ 0.76 $ (0.17)