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Earnings Per Share
 12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
Earnings Per Share
Earnings Per Share

Basic earnings per share is calculated as net income (loss) 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 (loss) attributable to HollyFrontier stockholders:
 
 
Years Ended December 31,
 
 
2017
 
2016
 
2015
 
 
(In thousands, except per share data)
Net income (loss) attributable to HollyFrontier stockholders
 
$
805,395

 
$
(260,453
)
 
$
740,101

Participating securities’ (restricted stock) share in earnings
 
5,047

 
1,003

 
2,306

Net income (loss) attributable to common shares
 
$
800,348

 
$
(261,456
)
 
$
737,795

Average number of shares of common stock outstanding
 
176,174

 
176,101

 
188,731

Effect of dilutive variable restricted shares and performance share units (1)
 
1,022

 
—

 
209

Average number of shares of common stock outstanding assuming dilution
 
177,196

 
176,101

 
188,940

Basic earnings (loss) per share
 
$
4.54

 
$
(1.48
)
 
$
3.91

Diluted earnings (loss) per share
 
$
4.52

 
$
(1.48
)
 
$
3.90

 
 
 
 
 
 
 
(1) Excludes anti-dilutive restricted and performance share units of:
 
543

 
469

 
89