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Earnings Per Share
 6 Months Ended
Jun. 30, 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
June 30,
 
Six Months Ended
June 30,
 
 
2017
 
2016
 
2017
 
2016
 
 
(In thousands, except per share data)
Net income (loss) attributable to HollyFrontier stockholders
 
$
57,767

 
$
(409,368
)
 
$
12,299

 
$
(388,115
)
Participating securities’ (restricted stock) share in earnings
 
373

 
216

 
752

 
432

Net income (loss) attributable to common shares
 
$
57,394

 
$
(409,584
)
 
$
11,547

 
$
(388,547
)
Average number of shares of common stock outstanding
 
176,147

 
175,865

 
176,141

 
176,301

Effect of dilutive variable restricted shares and performance share units (1)
 
155

 
—

 
349

 
—

Average number of shares of common stock outstanding assuming dilution
 
176,302

 
175,865

 
176,490

 
176,301

Basic earnings (loss) per share
 
$
0.33

 
$
(2.33
)
 
$
0.07

 
$
(2.20
)
Diluted earnings (loss) per share
 
$
0.33

 
$
(2.33
)
 
$
0.07

 
$
(2.20
)
(1) Excludes anti-dilutive restricted and performance share units of:
 
140

 
191

 
133

 
183