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Earnings per share ("EPS") (Tables)
 12 Months Ended
Dec. 31, 2020
Earnings per share ("EPS") [Abstract]  
Calculation of Basic and Diluted Earnings Per Share
The components of the calculation of basic EPS and diluted EPS are as follows:
 
(Dollars in thousands)
 
2020
  
2019
  
2018
Profit/(loss) for the period used for calculation of EPS - basic
 
$
266,266
  
$
73,679
  
$
(46,927
)
Interest and amortization on the convertible notes
 
$
6,766
  
$
12,177
  
$
-
 
Profit/(loss) for the period used for calculation of EPS - dilutive
 
$
273,032
  
$
85,856
  
$
(46,927
)
             
Basic earnings per share:
            
Weighted average shares outstanding - basic
  
155,712,886
   
143,437,164
   
143,429,610
 
             
Diluted earnings per share:
            
Weighted average shares outstanding - basic
  
155,712,886
   
143,437,164
   
143,429,610
 
Dilutive equity awards
  
65,873
   
133,342
   
5,311
 
Dilutive shares related to convertible notes
  
14,275,217
   
24,589,370
   
-
 
Weighted average shares outstanding - dilutive
  
170,053,975
   
168,159,876
   
143,434,921