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Earnings Per Share
 12 Months Ended
Dec. 31, 2014
Earnings Per Share [Abstract]  
Earnings Per Share
Earnings Per Share

Basic earnings per share is calculated as net income attributable to HollyFrontier stockholders divided by the average number of shares of common stock outstanding. Diluted earnings per share assumes, when dilutive, the issuance of the net incremental shares from restricted shares and performance share units. The following is a reconciliation of the denominators of the basic and diluted per share computations for net income attributable to HollyFrontier stockholders:
 
 
Years Ended December 31,
 
 
2014
 
2013
 
2012
 
 
(In thousands, except per share data)
Net income attributable to HollyFrontier stockholders
 
$
281,292

 
$
735,842

 
$
1,727,172

Participating securities' share in earnings
 
820

 
2,754

 
7,648

Net income attributable to common shares
 
280,472

 
733,088

 
1,719,524

Average number of shares of common stock outstanding
 
197,243

 
200,419

 
204,379

Effect of dilutive variable restricted shares and performance share units (1)
 
185

 
815

 
895

Average number of shares of common stock outstanding assuming dilution
 
197,428

 
201,234

 
205,274

Basic earnings per share
 
$
1.42

 
$
3.66

 
$
8.41

Diluted earnings per share
 
$
1.42

 
$
3.64

 
$
8.38

 
 
 
 
 
 
 
(1) Excludes anti-dilutive restricted and performance share units of:
 
356

 
166

 
166