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Stockholders' equity and dividend payment, Stockholders' equity (Details)
 12 Months Ended
Dec. 31, 2021
Vote
$ / shares
shares
Dec. 31, 2020
shares
Common Stock [Abstract]    
Number of vote per common stock | Vote 1  
Common Stock [Member]    
Stockholders' Equity [Abstract]    
Issued, Beginning balance (in shares) 170,798,328 146,819,401
Restricted stock issued (in shares) 841,696 601,530
Conversion of convertible bonds (in shares)   23,377,397
Retirement of treasury shares (in shares) (5,513,254)  
Issued, Ending balance (in shares) 166,126,770 170,798,328
Par value (in dollars per share) | $ / shares $ 0.01  
Number of shares authorized for issue (in shares) 250,000,000  
Preference Stock [Member]    
Stockholders' Equity [Abstract]    
Par value (in dollars per share) | $ / shares $ 0.01