Quarterly Financial Information

12 Months Ended

Dec. 31, 2015

Quarterly Financial Information Disclosure [Abstract]

Quarterly Financial Information

Quarterly Financial Information (Unaudited)

	Three Months Ended
	March 31, 2015		June 30, 2015		September 30, 2015		December 31, 2015
Net sales	$	1,103,531	$	1,185,002	$	1,188,037	$	986,766
Gross profit	284,546		353,181		311,276		236,188
Income from operations	229,280		295,374		254,028		181,145
Net income attributable to    Westlake Chemical Corporation	146,342		205,095		183,604		110,969
Earnings per common share attributable to Westlake Chemical Corporation: (1)
Basic	$	1.10	$	1.55	$	1.39	$	0.85
Diluted	$	1.10	$	1.54	$	1.39	$	0.84
	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

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(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.