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Earnings Per Share
 9 Months Ended
Sep. 30, 2013
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 variable restricted and variable performance shares. The following is a reconciliation of the denominators of the basic and diluted per share computations for net income attributable to HollyFrontier stockholders:
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
 
2013
 
2012
 
2013
 
2012
 
 
(In thousands, except per share data)
Net income attributable to HollyFrontier stockholders
 
$
82,290

 
$
600,373

 
$
672,940

 
$
1,335,568

Participating securities' share in earnings
 
285

 
2,657

 
2,447

 
5,745

Net income attributable to common shares
 
$
82,005

 
$
597,716

 
$
670,493

 
$
1,329,823

Average number of shares of common stock outstanding
 
199,098

 
202,655

 
201,109

 
205,768

Effect of dilutive variable restricted shares and performance share units (1)
 
411

 
877

 
377

 
886

Average number of shares of common stock outstanding assuming dilution
 
199,509

 
203,532

 
201,486

 
206,654

Basic earnings per share
 
$
0.41

 
$
2.95

 
$
3.33

 
$
6.46

Diluted earnings per share
 
$
0.41

 
$
2.94

 
$
3.33

 
$
6.44

 
 
 
 
 
 
 
 
 
(1) Excludes anti-dilutive restricted and performance share units of:
 
251

 
—

 
1

 
3