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Earnings Per Share
 12 Months Ended
Dec. 31, 2013
Earnings Per Share [Abstract]  
Earnings Per Share
(13) Earnings Per Share
The computations of the basic and diluted earnings per share for the years ended December 31, 2013, 2012 and 2011 are as follows:
 
For the Year Ended December 31,
 
2013
 
2012
 
2011
 
(in millions, except per share data)
Net income attributable to CVR Energy stockholders
$
370.7

 
$
378.6

 
$
345.8

Weighted-average number of shares of common stock outstanding
86.8

 
86.8

 
86.5

Effect of dilutive securities:
 
 
 
 
 
Non-vested restricted shares
—

 
0.6

 
1.3

Weighted-average number of shares of common stock outstanding assuming dilution
86.8

 
87.4

 
87.8

Basic earnings per share
$
4.27

 
$
4.36

 
$
4.00

Diluted earnings per share
$
4.27

 
$
4.33

 
$
3.94


Outstanding stock options totaling 18,533 common shares were excluded from the diluted earnings per share calculation for the year ended December 31, 2011, as they were antidilutive. All outstanding stock options totaling 22,900 were exercised in May 2012. There were no dilutive awards outstanding during the year-ended December 31, 2013, as all unvested awards under the LTIP were liability-classified awards. See Note 5 ("Share-Based Compensation").