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Earnings per share (Tables)
 12 Months Ended
Dec. 31, 2017
Earnings per share (Tables) [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):
  
2017
    
2016
    
2015
  
Profit/(loss) for the period used for calculation of EPS - basic
  
$
6,602
    
$
9,260
    
$
105,302
  
Interest and amortization on the convertible notes
  
$
-
            
$
11,340
  
Profit/(loss) for the period used for calculation of EPS - dilutive
  
$
6,602
    
$
9,260
    
$
116,641
  
 
                        
Basic earnings per share:
                        
Weighted average shares outstanding - basic
    
124,536,338
      
93,382,757
      
92,793,154
  
 
                        
Diluted earnings per share:
                        
Weighted average shares outstanding - basic
    
124,536,338
      
93,382,757
      
92,793,154
  
Dilutive equity awards
    
-
      
6,853
      
92,827
  
Dilutive shares related to convertible notes
    
-
      
-
      
19,212,240
  
Weighted average shares outstanding - dilutive
    
124,536,338
      
93,389,610
      
112,098,221