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Stockholders' equity and dividend payment (Tables)
 12 Months Ended
Dec. 31, 2019
Stockholders' equity and dividend payment [Abstract]  
Stockholders' Equity
Stockholders’ equity:
 
(Dollars in thousands, except per share data)
 
Common stock
  Preferred stock 
Issued at December 31, 2017
  
142,417,407
    
Restricted stock issued
  
1,175,136
    
Retirement of treasury shares
  
(892,497
)
   
Issued at December 31, 2018
  
142,700,046
    
Restricted stock issued
  
790,571
    
Conversion of convertible bonds
  
4,390,025
    
Retirement of treasury shares
  
(1,061,241
)
   
Issued at December 31, 2019
  
146,819,401
    
Par value
 
$
0.01
  
$
0.01
 
Shares to be issued assuming conversion of convertible notes due 2021*
  
31,141,489
     
Number of shares authorized for issue at December 31, 2019
  
250,000,000
     

* Assuming the maximum fundamental change conversion rate.
Dividend Payment
Dividend payment:
 
Dividend payment as of December 31, 2019:
   

 
Payment date:
 
Total payment
 
Per share
Common
 
February 26, 2019
 
$
7.1 million 
$
0.05
 
May 28, 2019
 
$
11.4 million 
$
0.08
 
August 29, 2019
 
$
2.8 million 
$
0.02
 
November 14, 2019
 
$
7.3 million 
$
0.05
 
Total payment as of December 31, 2019:
 
$
28.7 million 
$
0.20
 

Dividend payment as of December 31, 2018:
   

 
Payment date:
 
Total payment
 
Per share
Common
 
February 28, 2018
 
$
2.9 million 
$
0.02
 
May 30, 2018
 
$
2.9 million 
$
0.02
 
August 31, 2018
 
$
2.9 million 
$
0.02
 
November 23, 2018
 
$
2.9 million 
$
0.02
 
Total payment as of December 31, 2018:
 
$
11.5 million 
$
0.08
 

Dividend payment as of December 31, 2017:
   

 
Payment date:
 
Total payment
 
Per share
Common
 
February 22, 2017
 
$
7.6 million 
$
0.08
 
May 31, 2017
 
$
10.1 million 
$
0.08
 
August 31, 2017
 
$
2.8 million 
$
0.02
 
December 6, 2017
 
$
2.8 million 
$
0.02
 
Total payment as of December 31, 2017:
 
$
23.3 million 
$
0.20