Quarterly Financial Information

12 Months Ended

Dec. 31, 2014

Quarterly Financial Information Disclosure [Abstract]

Quarterly Financial Information

Quarterly Financial Information (Unaudited)

	Three Months Ended
	March 31, 2014		June 30, 2014		September 30, 2014		December 31, 2014
Net sales	$	1,027,676	$	998,576	$	1,253,227	$	1,135,871
Gross profit	287,010		305,971		361,520		362,849
Income from operations	248,055		266,788		306,761		302,387
Net income attributable to    Westlake Chemical Corporation	158,032		169,443		167,757		183,291
Earnings per common share attributable to Westlake Chemical Corporation: (1)
Basic	$	1.18	$	1.27	$	1.26	$	1.38
Diluted	$	1.18	$	1.26	$	1.25	$	1.37
	Three Months Ended
	March 31, 2013		June 30, 2013		September 30, 2013		December 31, 2013
Net sales	$	864,647	$	939,047	$	1,004,165	$	951,625
Gross profit	227,809		273,487		304,471		295,671
Income from operations	194,055		235,227		266,602		257,580
Net income attributable to    Westlake Chemical Corporation	123,347		145,816		170,290		170,972
Earnings per common share attributable to Westlake Chemical Corporation: (1) (2)
Basic	$	0.92	$	1.09	$	1.28	$	1.28
Diluted	$	0.92	$	1.09	$	1.27	$	1.27

______________________________

(1) Basic and diluted earnings per common share ("EPS") for each quarter is computed using the weighted average shares outstanding during that quarter, while EPS for the year is computed using the weighted average shares outstanding for the year. As a result, the sum of the EPS for each of the four quarters may not equal the EPS for the year.

(2) Per share data for the prior year periods have been restated to reflect the effect of a two-for-one stock split. See Note 8 for additional information.