Earnings per Share (Tables)

6 Months Ended

Jun. 30, 2015

Earnings Per Share [Abstract]

Schedule Of Net Income Attributable To Common Stockholders

	Three Months Ended June 30,						Six Months Ended June 30,
	2015			2014			2015			2014
Net income attributable to    Westlake Chemical Corporation	$	205,095		$	169,443		$	351,437		$	327,475
Less:
Net income attributable to participating securities	(253		)	(360		)	(457		)	(746		)
Net income attributable to common shareholders	$	204,842		$	169,083		$	350,980		$	326,729

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 June 30,				Six Months Ended June 30,
	2015		2014		2015		2014
Weighted average common shares—basic	132,538,123		133,223,705		132,625,857		133,148,398
Plus incremental shares from:
Assumed exercise of options	506,852		544,185		498,840		542,438
Weighted average common shares—diluted	133,044,975		133,767,890		133,124,697		133,690,836
Earnings per common share attributable to    Westlake Chemical Corporation:
Basic	$	1.55	$	1.27	$	2.65	$	2.45
Diluted	$	1.54	$	1.26	$	2.64	$	2.44