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Earnings per Share (Tables)
 3 Months Ended
Mar. 31, 2017
Earnings Per Share [Abstract]  
Schedule Of Net Income Attributable To Common Stockholders
Diluted earnings per share include the effect of certain stock options.
 
 
Three Months Ended March 31,
 
 
2017
 
2016
Net income attributable to Westlake Chemical Corporation
 
$
138,190

 
$
123,128

Less:
 
 
 
 
Net income attributable to participating securities
 
(694
)
 
(549
)
Net income attributable to common shareholders
 
$
137,496

 
$
122,579
Reconciliation Of Denominator For Basic And Diluted Earnings Per Share
The following table reconciles the denominator for the basic and diluted earnings per share computations shown in the consolidated statements of operations:
 
 
Three Months Ended March 31,
 
 
2017
 
2016
Weighted average common shares—basic
 
128,979,357

 
130,189,964

Plus incremental shares from:
 
 
 
 
Assumed exercise of options
 
712,658

 
410,550

Weighted average common shares—diluted
 
129,692,015

 
130,600,514

 
 
 
 
 
Earnings per common share attributable to
   Westlake Chemical Corporation:
 
 
 
 
Basic
 
$
1.07

 
$
0.94

Diluted
 
$
1.06

 
$
0.94