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Earnings Per Share
 3 Months Ended
Mar. 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:
 
 
Three Months Ended
March 31,
 
 
2017
 
2016
 
 
(In thousands, except per share data)
Net income (loss) attributable to HollyFrontier stockholders
 
$
(45,468
)
 
$
21,253

Participating securities’ (restricted stock) share in earnings
 
379

 
216

Net income (loss) attributable to common shares
 
$
(45,847
)
 
$
21,037

Average number of shares of common stock outstanding
 
176,210

 
176,737

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

 
47

Average number of shares of common stock outstanding assuming dilution
 
176,210

 
176,784

Basic earnings (loss) per share
 
$
(0.26
)
 
$
0.12

Diluted earnings (loss) per share
 
$
(0.26
)
 
$
0.12

(1) Excludes anti-dilutive restricted and performance share units of:
 
135

 
177