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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2015
Earnings Per Share [Abstract]  
Schedule Of Net Income Attributable To Common Stockholders
 
 
Year Ended December 31,
 
 
2015
 
2014
 
2013
Net income attributable to Westlake Chemical Corporation
 
$
646,010

 
$
678,523

 
$
610,425

Less:
 
 
 
 
 
 
Net income attributable to participating securities
 
(2,825
)
 
(1,502
)
 
(2,562
)
Net income attributable to common shareholders
 
$
643,185

 
$
677,021

 
$
607,863
Reconciliation Of Denominator For Basic And Diluted Earnings (Loss) Per Share
The following table reconciles the denominator for the basic and diluted earnings per share computations shown in the consolidated statements of operations:
 
 
Year Ended December 31,
 
 
2015
 
2014
 
2013
Weighted average common shares—basic (1)
 
131,823,707

 
133,111,230

 
133,224,256

Plus incremental shares from:
 
 
 
 
 
 
Assumed exercise of options (1)
 
478,105

 
532,184

 
554,994

Weighted average common shares—diluted (1)
 
132,301,812

 
133,643,414

 
133,779,250

 
 
 
 
 
 
 
Earnings per common share attributable to
   Westlake Chemical Corporation: (1)
 
 
 
 
 
 
Basic
 
$
4.88

 
$
5.09

 
$
4.57

Diluted
 
$
4.86

 
$
5.07

 
$
4.55