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Earnings per Share (Tables)
 6 Months Ended
Jun. 30, 2015
Earnings per Share [Abstract]  
Calculation of earnings (loss) per share
The following table reconciles the numerators and denominators used to calculate basic and diluted EPS and also indicates the number of antidilutive securities.
 
  
Three months ended June 30,
  
Six months ended June 30,
 
  
2015
  
2014
  
2015
  
2014
 
  
(In thousands, except per share data and as otherwise noted)
 
Basic earnings per share:
        
         
Net income
 
$
113,654
  
$
45,522
  
$
246,730
  
$
105,504
 
                 
Weighted average common shares outstanding
  
339,705
   
338,626
   
339,406
   
338,419
 
                 
Basic income per share
 
$
0.33
  
$
0.13
  
$
0.73
  
$
0.31
 
                 
Diluted earnings per share:
                
                 
Net income
 
$
113,654
  
$
45,522
  
$
246,730
  
$
105,504
 
                 
Interest expense, net of tax:
                
2% Convertible Senior Notes due 2020
  
3,049
   
3,049
   
6,098
   
6,098
 
5% Convertible Senior Notes due 2017
  
4,692
   
-
   
9,384
   
-
 
                 
Diluted income available to common shareholders
 
$
121,395
  
$
48,571
  
$
262,212
  
$
111,602
 
                 
Weighted average shares - basic
  
339,705
   
338,626
   
339,406
   
338,419
 
                 
Effect of dilutive securities:
                
Unvested restricted stock units
  
1,831
   
2,913
   
2,203
   
3,013
 
2% Convertible Senior Notes due 2020
  
71,942
   
71,942
   
71,942
   
71,942
 
5% Convertible Senior Notes due 2017
  
25,670
   
-
   
25,670
   
-
 
                 
Weighted average shares - diluted
  
439,148
   
413,481
   
439,221
   
413,374
 
                 
Diluted income per share
 
$
0.28
  
$
0.12
  
$
0.60
  
$
0.27
 
                 
Antidilutive securities (in millions)
  
28.9
   
54.5
   
28.9
   
54.5