Earnings per Share (Tables)

9 Months Ended

Sep. 30, 2015

Earnings Per Share [Abstract]

Schedule Of Net Income Attributable To Common Stockholders

	Three Months Ended September 30,						Nine Months Ended September 30,
	2015			2014			2015			2014
Net income attributable to    Westlake Chemical Corporation	$	183,604		$	167,757		$	535,041		$	495,232
Less:
Net income attributable to participating securities	(195		)	(353		)	(653		)	(1,099		)
Net income attributable to common shareholders	$	183,409		$	167,404		$	534,388		$	494,133

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,
	2015		2014		2015		2014
Weighted average common shares—basic	131,664,296		133,299,458		132,301,814		133,199,304
Plus incremental shares from:
Assumed exercise of options	456,939		546,601		484,720		543,841
Weighted average common shares—diluted	132,121,235		133,846,059		132,786,534		133,743,145
Earnings per common share attributable to    Westlake Chemical Corporation:
Basic	$	1.39	$	1.26	$	4.04	$	3.71
Diluted	$	1.39	$	1.25	$	4.02	$	3.69