Earnings per Share (Tables)

9 Months Ended

Sep. 30, 2016

Earnings Per Share [Abstract]

Schedule Of Net Income Attributable To Common Stockholders

	Three Months Ended September 30,						Nine Months Ended September 30,
	2016			2015			2016			2015
Net income attributable to    Westlake Chemical Corporation	$	65,662		$	183,604		$	299,914		$	535,041
Less:
Net income attributable to participating securities	(294		)	(195		)	(1,347		)	(653		)
Net income attributable to common shareholders	$	65,368		$	183,409		$	298,567		$	534,388

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 September 30,				Nine Months Ended September 30,
	2016		2015		2016		2015
Weighted average common shares—basic	128,793,661		131,664,296		129,519,577		132,301,814
Plus incremental shares from:
Assumed exercise of options	586,295		456,939		584,320		484,720
Weighted average common shares—diluted	129,379,956		132,121,235		130,103,897		132,786,534
Earnings per common share attributable to    Westlake Chemical Corporation:
Basic	$	0.51	$	1.39	$	2.31	$	4.04
Diluted	$	0.51	$	1.39	$	2.29	$	4.02