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Stockholders equity and dividend payment, Stockholders equity (Details)
 9 Months Ended
Sep. 30, 2020
Vote
$ / shares
shares
Aug. 31, 2020
shares
Jul. 31, 2020
shares
Common Stock [Abstract]      
Number of vote per common stock | Vote 1    
Common Stock [Member]      
Stockholders' Equity [Abstract]      
Issued (in shares) 170,798,328 170,798,328 147,420,931
Number of shares authorized for issue (in shares) 250,000,000    
Par value (in dollars per share) | $ / shares $ 0.01    
Preferred stock [Abstract]      
Shares outstanding (in shares)   170,798,328 147,420,931
Preference Shares [Member]      
Stockholders' Equity [Abstract]      
Issued (in shares) 0    
Number of shares authorized for issue (in shares) 1,000,000    
Par value (in dollars per share) | $ / shares $ 0.01    
Series C preference shares [Member]      
Preferred stock [Abstract]      
Shares outstanding (in shares) 0    
Series D Preferred Stock [Member]      
Preferred stock [Abstract]      
Shares outstanding (in shares) 0