XML 78 R63.htm IDEA: XBRL DOCUMENT v3.21.1
Stockholders' equity and dividend payment, Stockholders' equity (Details)
 12 Months Ended
Dec. 31, 2020
Vote
$ / shares
shares
Dec. 31, 2019
shares
Common Stock [Abstract]    
Number of vote per common stock | Vote 1  
Common Stock [Member]    
Stockholders' Equity [Abstract]    
Issued, Beginning balance (in shares) 146,819,401 142,700,046
Restricted stock issued (in shares) 601,530 790,571
Conversion of convertible bonds (in shares) 23,377,397 4,390,025
Retirement of treasury shares (in shares)   (1,061,241)
Issued, Ending balance (in shares) 170,798,328 146,819,401
Par value (in dollars per share) | $ / shares $ 0.01  
Number of shares authorized for issue (in shares) 250,000,000  
Preference Shares [Member]    
Stockholders' Equity [Abstract]    
Par value (in dollars per share) | $ / shares $ 0.01