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Stockholders' equity and dividend payment, Stockholders' equity (Details)
 12 Months Ended
Dec. 31, 2019
Vote
$ / shares
shares
Dec. 31, 2018
shares
Jan. 31, 2017
$ / shares
Common Stock [Abstract]      
Number of vote per common stock | Vote 1    
Common Stock [Member]      
Stockholders' Equity [Abstract]      
Issued, Beginning balance (in shares) 142,700,046 142,417,407  
Restricted stock issued (in shares) 790,571 1,175,136  
Conversion of convertible bonds (in shares) 4,390,025    
Retirement of treasury shares (in shares) (1,061,241) (892,497)  
Issued, Ending balance (in shares) 146,819,401 142,700,046  
Par value (in dollars per share) | $ / shares $ 0.01   $ 0.01
Shares to be issued assuming conversion of convertible notes due in 2021 (in shares) [1] 31,141,489    
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    
[1] Assuming the maximum fundamental change conversion rate.