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Stockholders' equity and dividend payment (Tables)
 12 Months Ended
Dec. 31, 2020
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, 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
    
Restricted stock issued
  
601,530
    
Conversion of convertible bonds
  
23,377,397
    
Issued at December 31, 2020
  
170,798,328
    
Par value
 
$
0.01
  $
0.01
Number of shares authorized for issue at December 31, 2020
  
250,000,000
    
Dividend Payment
Dividend payment:
 
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

Dividend payment as of December 31, 2018:
  Per share
Payment date:
 Total payment 
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