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Net Income (Loss) Per Share (Notes)
 6 Months Ended
Jun. 30, 2017
Earnings Per Share [Abstract]  
Net Income (Loss) Per Share
  Net Income (Loss) Per Share

The following table sets forth the computation of Net Income (Loss) Per Share for the three-month and six-month periods ended June 30, 2017 and 2016 (in thousands, except per share data):
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
 
2017
 
2016
 
2017
 
2016
Numerator for Basic and Diluted Earnings Per Share -
 
 
 
 
 
 
 
Net Income (Loss)
$
23,053

 
$
(292,558
)
 
$
51,570

 
$
(764,334
)
Denominator for Basic Earnings Per Share -
 

 
 

 
 

 
 

Weighted Average Shares
574,439

 
547,335

 
574,162

 
547,029

Potential Dilutive Common Shares -
 

 
 

 
 

 
 

Stock Options/SARs
1,452

 
—

 
1,669

 
—

Restricted Stock/Units and Performance Units/Stock
2,592

 
—

 
2,742

 
—

Denominator for Diluted Earnings Per Share -
 

 
 

 
 

 
 

Adjusted Diluted Weighted Average Shares
578,483

 
547,335

 
578,573

 
547,029

Net Income (Loss) Per Share
 

 
 

 
 

 
 

Basic
$
0.04

 
$
(0.53
)
 
$
0.09

 
$
(1.40
)
Diluted
$
0.04

 
$
(0.53
)
 
$
0.09

 
$
(1.40
)


The diluted earnings per share calculation excludes stock options, SARs, restricted stock and units and performance units that were anti-dilutive. Shares underlying the excluded stock options and SARs totaled 3.4 million and 10.2 million shares for the three months ended June 30, 2017 and 2016, respectively, and 2.0 million and 10.4 million shares for the six months ended June 30, 2017 and 2016, respectively. For both the three months and six months ended June 30, 2016, 4.6 million shares of restricted stock, restricted stock units and performance units were excluded.