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Stockholders' equity and dividend payment (Tables)
 12 Months Ended
Dec. 31, 2021
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, 2019
    
146,819,401
        
Restricted stock issued
    
601,530
        
Conversion of convertible bonds
    
23,377,397
        
Issued at December 31, 2020
    
170,798,328
        
Restricted stock issued
    
841,696
        
Retirement of treasury shares
    
(5,513,254
)
      
Issued at December 31, 2021
    
166,126,770
        
Par value
  
$
0.01
    
$
0.01
  
Number of shares authorized for issue at December 31, 2021
    
250,000,000
          
Dividend Payment
Dividend payment:
 
Dividend payment as of December 31, 2021:
    
Per share
Payment date:
Total payment
  
Common
February 25, 2021
$ 8.6 million
  
$
0.05
May 26, 2021
$ 6.8 million
  
$
0.04
August 26, 2021
$ 3.3 million
  
$
0.02
November 23, 2021
$ 3.3 million
  
$
0.02
Total payment as of December 31, 2021:
$ 22.1 million
  
$
0.13

Dividend payment as of December 31, 2020:
     Per share
Payment date:
Total payment
  
Common
February 25, 2020
$ 47.0 million
  
$
0.32
May 26, 2020
$ 51.5 million
  
$
0.35
September 2, 2020
$ 82.0 million
  
$
0.48
November 25, 2020
$ 34.2 million
  
$
0.20
Total payment as of December 31, 2020:
$ 214.7 million
  
$
1.35

Dividend payment as of December 31, 2019:
     Per share
Payment date:
  Total payment  
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