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Net Income (Loss) Per Share
 12 Months Ended
Dec. 31, 2014
Earnings Per Share [Abstract]  
NET INCOME (LOSS) PER SHARE
NET INCOME (LOSS) PER SHARE
Basic net income (loss) per share is computed by dividing net income (loss) available to common stockholders by the weighted average number of common shares outstanding during the period. Diluted net income (loss) per share reflects the potential dilution that would occur if securities or other contracts to issue common stock were exercised or converted into common stock.
For the years ended December 31, 2014, 2013, and 2012, 1,871,681, 1,111,021, and 479,767 shares, respectively, of common stock equivalents related to equity-based awards were not included in the diluted per share calculation as the shares would be antidilutive.
The 3.25% Convertible Senior Notes were not included in the computation of diluted net income (loss) per share for the years ended December 31, 2014, 2013, and 2012 because there is no excess value upon conversion over the principal amount of the Notes.
 
Year ended December 31,
In thousands except per share amounts
2014
 
2013
 
2012
Net income (loss) available to common stockholders
$
(1,155,884
)
 
$
(650,563
)
 
$
48,677

Weighted average shares:
 
 
 
 
 
Basic
102,441

 
97,864

 
89,437

Effect of stock-based compensation plans
—

 
—

 
166

Diluted
102,441

 
97,864

 
89,603

Income (loss) per share:
 
 
 
 
 
Basic
$
(11.28
)
 
$
(6.65
)
 
$
0.54

Diluted
$
(11.28
)
 
$
(6.65
)
 
$
0.54