Guarantor Disclosures (Tables)

6 Months Ended

Jun. 30, 2016

Guarantees [Abstract]

Condensed Consolidating Financial Information Balance Sheet

Condensed Consolidating Financial Information as of June 30, 2016

	Westlake Chemical Corporation		100% Owned Guarantor Subsidiaries		OpCo (Less Than 100% Owned Guarantor Subsidiary)		Non- Guarantor Subsidiaries		Eliminations			Consolidated
Balance Sheet
Current assets
Cash and cash equivalents	$	412,881	$	1,095	$	142,339	$	214,682	$	—		$	770,997
Marketable securities	352,021		—		—		—		—			352,021
Accounts receivable, net	15,228		2,306,348		68,738		136,839		(1,944,298		)	582,855
Inventories	—		348,372		2,493		97,661		—			448,526
Prepaid expenses and other current assets	11,126		15,861		73		12,820		(4,238		)	35,642
Total current assets	791,256		2,671,676		213,643		462,002		(1,948,536		)	2,190,041
Property, plant and equipment, net	—		1,606,327		1,203,249		420,947		—			3,230,523
Equity investments	5,269,364		1,211,547		—		471,900		(6,943,882		)	8,929
Other assets, net	59,169		587,816		126,424		129,944		(412,282		)	491,071
Total assets	$	6,119,789	$	6,077,366	$	1,543,316	$	1,484,793	$	(9,304,700	)	$	5,920,564
Current liabilities
Accounts and notes payable	$	1,924,189	$	116,376	$	93,294	$	91,435	$	(1,918,178	)	$	307,116
Accrued liabilities	8,873		164,520		75,405		94,545		(30,358		)	312,985
Total current liabilities	1,933,062		280,896		168,699		185,980		(1,948,536		)	620,101
Long-term debt	747,564		10,889		379,997		—		(379,997		)	758,453
Deferred income taxes	—		618,716		1,712		48,596		(4,037		)	664,987
Other liabilities	—		67,744		—		100,091		(28,248		)	139,587
Total liabilities	2,680,626		978,245		550,408		334,667		(2,360,818		)	2,183,128
Total Westlake Chemical Corporation stockholders' equity	3,439,163		5,099,121		992,908		851,853		(6,943,882		)	3,439,163
Noncontrolling interests	—		—		—		298,273		—			298,273
Total equity	3,439,163		5,099,121		992,908		1,150,126		(6,943,882		)	3,737,436
Total liabilities and equity	$	6,119,789	$	6,077,366	$	1,543,316	$	1,484,793	$	(9,304,700	)	$	5,920,564

Condensed Consolidating Financial Information as of December 31, 2015

	Westlake Chemical Corporation		100% Owned Guarantor Subsidiaries		OpCo (Less Than 100% Owned Guarantor Subsidiary)		Non-Guarantor Subsidiaries		Eliminations			Consolidated
Balance Sheet
Current assets
Cash and cash equivalents	$	303,131	$	6,828	$	163,430	$	189,136	$	—		$	662,525
Marketable securities	520,144		—		—		—		—			520,144
Accounts receivable, net	10,943		2,183,276		51,582		113,321		(1,850,590		)	508,532
Inventories	—		326,588		3,879		103,593		—			434,060
Prepaid expenses and other current assets	2,201		12,166		267		2,734		(2,879		)	14,489
Deferred income taxes	702		32,787		—		1,950		—			35,439
Total current assets	837,121		2,561,645		219,158		410,734		(1,853,469		)	2,175,189
Property, plant and equipment, net	—		1,567,897		1,020,469		415,701		—			3,004,067
Equity investments	4,991,167		1,207,679		—		469,915		(6,659,553		)	9,208
Other assets, net	11,929		450,428		44,157		129,539		(255,232		)	380,821
Total assets	$	5,840,217	$	5,787,649	$	1,283,784	$	1,425,889	$	(8,768,254	)	$	5,569,285
Current liabilities
Accounts payable	$	1,817,963	$	121,820	$	33,901	$	87,510	$	(1,825,865	)	$	235,329
Accrued liabilities	9,117		195,785		21,873		88,142		(27,604		)	287,313
Total current liabilities	1,827,080		317,605		55,774		175,652		(1,853,469		)	522,642
Long-term debt	747,259		10,889		248,665		—		(248,665		)	758,148
Deferred income taxes	—		532,837		1,392		47,941		(6,567		)	575,603
Other liabilities	—		49,334		—		101,627		—			150,961
Total liabilities	2,574,339		910,665		305,831		325,220		(2,108,701		)	2,007,354
Total Westlake Chemical Corporation stockholders' equity	3,265,878		4,876,984		977,953		804,616		(6,659,553		)	3,265,878
Noncontrolling interests	—		—		—		296,053		—			296,053
Total equity	3,265,878		4,876,984		977,953		1,100,669		(6,659,553		)	3,561,931
Total liabilities and equity	$	5,840,217	$	5,787,649	$	1,283,784	$	1,425,889	$	(8,768,254	)	$	5,569,285

Condensed Consolidating Financial Information Statement Of Operations

Condensed Consolidating Financial Information for the Three Months Ended June 30, 2016

	Westlake Chemical Corporation			100% Owned Guarantor Subsidiaries			OpCo (Less Than 100% Owned Guarantor Subsidiary)			Non- Guarantor Subsidiaries			Eliminations			Consolidated
Statement of Operations
Net sales	$	—		$	845,088		$	210,841		$	289,520		$	(259,388	)	$	1,086,061
Cost of sales	—			720,774			122,460			255,846			(254,385		)	844,695
Gross profit	—			124,314			88,381			33,674			(5,003		)	241,366
Selling, general and administrative expenses	950			48,331			5,174			11,976			(5,003		)	61,428
(Loss) income from operations	(950		)	75,983			83,207			21,698			—			179,938
Interest expense	(10,688		)	(13		)	(221		)	(50		)	5,057			(5,915		)
Other income, net	3,587			4,900			159			4,592			(5,057		)	8,181
(Loss) income before income taxes	(8,051		)	80,870			83,145			26,240			—			182,204
(Benefit from) provision for income taxes	(2,960		)	62,396			297			6,851			—			66,584
Equity in net income of subsidiaries	116,215			71,849			—			10,999			(199,063		)	—
Net income	111,124			90,323			82,848			30,388			(199,063		)	115,620
Net income attributable to noncontrolling interests	—			—			—			4,496			—			4,496
Net income attributable to Westlake Chemical Corporation	$	111,124		$	90,323		$	82,848		$	25,892		$	(199,063	)	$	111,124
Comprehensive income attributable to    Westlake Chemical Corporation	$	119,686		$	102,001		$	82,848		$	12,392		$	(197,241	)	$	119,686

Condensed Consolidating Financial Information for the Three Months Ended June 30, 2015

	Westlake Chemical Corporation			100% Owned Guarantor Subsidiaries			OpCo (Less Than 100% Owned Guarantor Subsidiary)			Non- Guarantor Subsidiaries			Eliminations			Consolidated
Statement of Operations
Net sales	$	—		$	990,434		$	251,705		$	250,365		$	(307,502	)	$	1,185,002
Cost of sales	—			750,892			157,177			226,283			(302,531		)	831,821
Gross profit	—			239,542			94,528			24,082			(4,971		)	353,181
Selling, general and administrative expenses	399			42,682			5,191			14,506			(4,971		)	57,807
(Loss) income from operations	(399		)	196,860			89,337			9,576			—			295,374
Interest expense	(10,569		)	(4		)	(856		)	(52		)	2,523			(8,958		)
Other income (expense), net	9,776			(9,371		)	34			24,142			(2,523		)	22,058
(Loss) income before income taxes	(1,192		)	187,485			88,515			33,666			—			308,474
(Benefit from) provision for income taxes	(399		)	97,218			(41		)	1,635			—			98,413
Equity in net income of subsidiaries	205,888			76,799			—			11,757			(294,444		)	—
Net income	205,095			167,066			88,556			43,788			(294,444		)	210,061
Net income attributable to noncontrolling interests	—			—			—			4,966			—			4,966
Net income attributable to Westlake Chemical Corporation	$	205,095		$	167,066		$	88,556		$	38,822		$	(294,444	)	$	205,095
Comprehensive income attributable to    Westlake Chemical Corporation	$	222,833		$	167,206		$	88,556		$	56,879		$	(312,641	)	$	222,833

Condensed Consolidating Financial Information Statement Of Cash Flows

Condensed Consolidating Financial Information for the Six Months Ended June 30, 2016

	Westlake Chemical Corporation			100% Owned Guarantor Subsidiaries			OpCo (Less Than 100% Owned Guarantor Subsidiary)			Non- Guarantor Subsidiaries			Eliminations			Consolidated
Statement of Cash Flows
Cash flows from operating activities
Net income	$	234,252		$	198,563		$	187,418		$	57,065		$	(432,742	)	$	244,556
Adjustments to reconcile net income to net cash    provided by operating activities
Depreciation and amortization	417			71,640			41,182			20,142			—			133,381
Deferred income taxes	(4,802		)	105,828			320			1,644			—			102,990
Net changes in working capital and other	(275,002		)	(194,894		)	(40,445		)	(33,436		)	432,742			(111,035		)
Net cash (used for) provided by operating activities	(45,135		)	181,137			188,475			45,415			—			369,892
Cash flows from investing activities
Additions to property, plant and equipment	—			(101,270		)	(168,533		)	(17,357		)	—			(287,160		)
Proceeds from disposition of assets	—			7			98			—			—			105
Proceeds from sales and maturities of securities	302,432			—			—			—			—			302,432
Purchase of securities	(130,830		)	(7,592		)	—			—			—			(138,422		)
Settlements of derivative instruments	—			(3,372		)	—			—			—			(3,372		)
Net cash provided by (used for) investing activities	171,602			(112,227		)	(168,435		)	(17,357		)	—			(126,417		)
Cash flows from financing activities
Intercompany financing	106,904			(233,536		)	131,832			(5,200		)	—			—
Intercompany financing—OpCo	—			500			(500		)	—			—			—
Debt issuance costs	(9,700		)	—			—			—			—			(9,700		)
Dividends paid	(47,317		)	—			—			—			—			(47,317		)
Distributions paid	—			158,393			(172,463		)	5,986			—			(8,084		)
Proceeds from exercise of stock options	481			—			—			—			—			481
Proceeds from issuance of notes payable	—			—			—			3,842			—			3,842
Repayment of notes payable	—			—			—			(8,626		)	—			(8,626		)
Repurchase of common stock for treasury	(67,404		)	—			—			—			—			(67,404		)
Windfall tax benefits from share-based payment arrangements	319			—			—			—			—			319
Net cash used for financing activities	(16,717		)	(74,643		)	(41,131		)	(3,998		)	—			(136,489		)

	Westlake Chemical Corporation		100% Owned Guarantor Subsidiaries			OpCo (Less Than 100% Owned Guarantor Subsidiary)			Non- Guarantor Subsidiaries		Eliminations		Consolidated
Effect of exchange rate changes on cash and cash equivalents	—		—			—			1,486		—		1,486
Net increase (decrease) in cash and cash equivalents	109,750		(5,733		)	(21,091		)	25,546		—		108,472
Cash and cash equivalents at beginning of period	303,131		6,828			163,430			189,136		—		662,525
Cash and cash equivalents at end of period	$	412,881	$	1,095		$	142,339		$	214,682	$	—	$	770,997

Condensed Consolidating Financial Information for the Six Months Ended June 30, 2015

	Westlake Chemical Corporation			100% Owned Guarantor Subsidiaries			OpCo (Less Than 100% Owned Guarantor Subsidiary)			Non- Guarantor Subsidiaries			Eliminations			Consolidated
Statement of Cash Flows
Cash flows from operating activities
Net income	$	351,437		$	304,242		$	177,899		$	59,996		$	(533,106	)	$	360,468
Adjustments to reconcile net income to net cash (used for)    provided by operating activities
Depreciation and amortization	1,002			59,792			40,195			18,994			—			119,983
Deferred income taxes	(40		)	929			(234		)	2,433			—			3,088
Net changes in working capital and other	(371,716		)	(310,600		)	15,748			85,278			533,106			(48,184		)
Net cash (used for) provided by operating activities	(19,317		)	54,363			233,608			166,701			—			435,355
Cash flows from investing activities
Acquisition of business, net of cash acquired	—			—			—			15,782			—			15,782
Additions to property, plant and equipment	—			(95,363		)	(95,514		)	(13,056		)	—			(203,933		)
Proceeds from sales and maturities of securities	15,037			—			—			—			—			15,037
Settlements of derivative instruments	—			(1,174		)	—			—			—			(1,174		)
Net cash provided by (used for) investing activities	15,037			(96,537		)	(95,514		)	2,726			—			(174,288		)
Cash flows from financing activities
Intercompany financing	208,692			(269,281		)	53,354			7,235			—			—
Intercompany financing—OpCo	—			135,341			(135,341		)	—			—			—
Dividends paid	(43,896		)	—			—			—			—			(43,896		)
Distributions paid	—			176,980			(189,103		)	4,905			—			(7,218		)
Purchase of limited partner interests	—			—			135,341			(135,341		)	—			—
Proceeds from exercise of stock options	831			—			—			—			—			831
Proceeds from issuance of notes payable	—			—			—			2,392			—			2,392
Repayment of notes payable	—			—			—			(4,299		)	—			(4,299		)
Repurchase of common stock for treasury	(62,804		)	—			—			—			—			(62,804		)
Windfall tax benefits from share-based payment arrangements	1,895			—			—			—			—			1,895
Net cash provided by (used for) financing activities	104,718			43,040			(135,749		)	(125,108		)	—			(113,099		)

	Westlake Chemical Corporation		100% Owned Guarantor Subsidiaries		OpCo (Less Than 100% Owned Guarantor Subsidiary)		Non- Guarantor Subsidiaries			Eliminations		Consolidated
Effect of exchange rate changes on cash and cash equivalents	—		—		—		(2,000		)	—		(2,000		)
Net increase in cash and cash equivalents	100,438		866		2,345		42,319			—		145,968
Cash and cash equivalents at beginning of period	655,947		3,057		131,545		90,052			—		880,601
Cash and cash equivalents at end of period	$	756,385	$	3,923	$	133,890	$	132,371		$	—	$	1,026,569