Guarantor Disclosures (Tables)

12 Months Ended

Dec. 31, 2015

Guarantor Disclosures [Abstract]

Condensed Consolidating Financial Information Balance Sheet

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	17,896		450,428		44,157		129,539		(255,232		)	386,788
Total assets	$	5,846,184	$	5,787,649	$	1,283,784	$	1,425,889	$	(8,768,254	)	$	5,575,252
Current liabilities
Accounts and notes 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	753,226		10,889		248,665		—		(248,665		)	764,115
Deferred income taxes	—		532,837		1,392		47,941		(6,567		)	575,603
Other liabilities	—		49,334		—		101,627		—			150,961
Total liabilities	2,580,306		910,665		305,831		325,220		(2,108,701		)	2,013,321
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	$	5,846,184	$	5,787,649	$	1,283,784	$	1,425,889	$	(8,768,254	)	$	5,575,252

Condensed Consolidating Financial Information as of December 31, 2014

	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	$	655,947	$	3,057	$	131,545	$	90,052	$	—		$	880,601
Accounts receivable, net	8,451		1,454,709		56,049		135,133		(1,093,676		)	560,666
Inventories	—		414,975		6,634		104,167		—			525,776
Prepaid expenses and other current assets	172		9,485		212		1,938		—			11,807
Deferred income taxes	409		29,832		—		2,196		—			32,437
Total current assets	664,979		1,912,058		194,440		333,486		(1,093,676		)	2,011,287
Property, plant and equipment, net	—		1,477,515		842,057		437,985		—			2,757,557
Equity investments	4,033,378		1,237,080		—		352,550		(5,561,703		)	61,305
Other assets, net	30,543		387,325		57,733		141,948		(233,708		)	383,841
Total assets	$	4,728,900	$	5,013,978	$	1,094,230	$	1,265,969	$	(6,889,087	)	$	5,213,990
Current liabilities
Accounts payable	$	1,055,527	$	160,834	$	17,680	$	95,856	$	(1,068,835	)	$	261,062
Accrued liabilities	8,754		203,608		11,225		77,372		(24,841		)	276,118
Total current liabilities	1,064,281		364,442		28,905		173,228		(1,093,676		)	537,180
Long-term debt	753,108		10,889		227,638		—		(227,638		)	763,997
Deferred income taxes	—		497,919		1,848		42,369		(6,070		)	536,066
Other liabilities	—		43,452		—		131,407		—			174,859
Total liabilities	1,817,389		916,702		258,391		347,004		(1,327,384		)	2,012,102
Total Westlake Chemical Corporation stockholders' equity	2,911,511		4,097,276		835,839		628,588		(5,561,703		)	2,911,511
Noncontrolling interests	—		—		—		290,377		—			290,377
Total equity	2,911,511		4,097,276		835,839		918,965		(5,561,703		)	3,201,888
Total liabilities and equity	$	4,728,900	$	5,013,978	$	1,094,230	$	1,265,969	$	(6,889,087	)	$	5,213,990

Schedule of Guarantor Obligations

ondensed 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	17,896		450,428		44,157		129,539		(255,232		)	386,788
Total assets	$	5,846,184	$	5,787,649	$	1,283,784	$	1,425,889	$	(8,768,254	)	$	5,575,252
Current liabilities
Accounts and notes 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	753,226		10,889		248,665		—		(248,665		)	764,115
Deferred income taxes	—		532,837		1,392		47,941		(6,567		)	575,603
Other liabilities	—		49,334		—		101,627		—			150,961
Total liabilities	2,580,306		910,665		305,831		325,220		(2,108,701		)	2,013,321
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	$	5,846,184	$	5,787,649	$	1,283,784	$	1,425,889	$	(8,768,254	)	$	5,575,252

Condensed Consolidating Financial Information as of December 31, 2014

	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	$	655,947	$	3,057	$	131,545	$	90,052	$	—		$	880,601
Accounts receivable, net	8,451		1,454,709		56,049		135,133		(1,093,676		)	560,666
Inventories	—		414,975		6,634		104,167		—			525,776
Prepaid expenses and other current assets	172		9,485		212		1,938		—			11,807
Deferred income taxes	409		29,832		—		2,196		—			32,437
Total current assets	664,979		1,912,058		194,440		333,486		(1,093,676		)	2,011,287
Property, plant and equipment, net	—		1,477,515		842,057		437,985		—			2,757,557
Equity investments	4,033,378		1,237,080		—		352,550		(5,561,703		)	61,305
Other assets, net	30,543		387,325		57,733		141,948		(233,708		)	383,841
Total assets	$	4,728,900	$	5,013,978	$	1,094,230	$	1,265,969	$	(6,889,087	)	$	5,213,990
Current liabilities
Accounts payable	$	1,055,527	$	160,834	$	17,680	$	95,856	$	(1,068,835	)	$	261,062
Accrued liabilities	8,754		203,608		11,225		77,372		(24,841		)	276,118
Total current liabilities	1,064,281		364,442		28,905		173,228		(1,093,676		)	537,180
Long-term debt	753,108		10,889		227,638		—		(227,638		)	763,997
Deferred income taxes	—		497,919		1,848		42,369		(6,070		)	536,066
Other liabilities	—		43,452		—		131,407		—			174,859
Total liabilities	1,817,389		916,702		258,391		347,004		(1,327,384		)	2,012,102
Total Westlake Chemical Corporation stockholders' equity	2,911,511		4,097,276		835,839		628,588		(5,561,703		)	2,911,511
Noncontrolling interests	—		—		—		290,377		—			290,377
Total equity	2,911,511		4,097,276		835,839		918,965		(5,561,703		)	3,201,888
Total liabilities and equity	$	4,728,900	$	5,013,978	$	1,094,230	$	1,265,969	$	(6,889,087	)	$	5,213,990

Condensed Consolidating Financial Information for the Year Ended December 31, 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	$	—		$	3,660,393		$	1,007,221		$	1,039,165		$	(1,243,443	)	$	4,463,336
Cost of sales	—			2,944,420			624,339			933,007			(1,223,621		)	3,278,145
Gross profit	—			715,973			382,882			106,158			(19,822		)	1,185,191
Selling, general and administrative expenses	2,478			167,431			20,138			55,139			(19,822		)	225,364
(Loss) income from operations	(2,478		)	548,542			362,744			51,019			—			959,827
Interest expense	(42,197		)	(10		)	(2,691		)	(521		)	10,763			(34,656		)
Other income (expense), net	19,614			1,033			(63		)	28,449			(10,763		)	38,270
(Loss) income before income taxes	(25,061		)	549,565			359,990			78,947			—			963,441
(Benefit from) provision for income taxes	(7,237		)	288,329			672			16,632			—			298,396
Equity in net income of subsidiaries	663,834			314,026			—			45,292			(1,023,152		)	—
Net income	646,010			575,262			359,318			107,607			(1,023,152		)	665,045
Net income attributable to noncontrolling interests	—			—			—			19,035			—			19,035
Net income attributable to Westlake Chemical Corporation	$	646,010		$	575,262		$	359,318		$	88,572		$	(1,023,152	)	$	646,010
Comprehensive income attributable to    Westlake Chemical Corporation	$	596,151		$	572,731		$	359,318		$	42,143		$	(974,192	)	$	596,151

Condensed Consolidating Financial Information for the Year Ended December 31, 2014

	Westlake Chemical Corporation			100% Owned Guarantor Subsidiaries			OpCo (Less Than 100% Owned Guarantor Subsidiary)			Non-Guarantor Subsidiaries			Eliminations			Consolidated
Statement of Operations
Net sales	$	—		$	3,727,361		$	1,749,700		$	475,401		$	(1,537,112	)	$	4,415,350
Cost of sales	—			3,162,246			1,003,888			447,676			(1,515,810		)	3,098,000
Gross profit	—			565,115			745,812			27,725			(21,302		)	1,317,350
Selling, general and administrative expenses	2,082			144,987			26,870			40,722			(21,302		)	193,359
(Loss) income from operations	(2,082		)	420,128			718,942			(12,997		)	—			1,123,991
Interest expense	(39,763		)	(10		)	(10,499		)	(492		)	13,412			(37,352		)
Other income (expense), net	21,001			(4,921		)	3,151			(8,540		)	(13,412		)	(2,721		)
(Loss) income before income taxes	(20,844		)	415,197			711,594			(22,029		)	—			1,083,918
Provision for (benefit from) income taxes	248			202,501			199,388			(3,235		)	—			398,902
Equity in net income of subsidiaries	699,615			496,244			—			15,962			(1,211,821		)	—
Net income (loss)	678,523			708,940			512,206			(2,832		)	(1,211,821		)	685,016
Net income attributable to noncontrolling interests	—			—			—			6,493			—			6,493
Net income (loss) attributable to Westlake Chemical Corporation	$	678,523		$	708,940		$	512,206		$	(9,325	)	$	(1,211,821	)	$	678,523
Comprehensive income (loss) attributable to    Westlake Chemical Corporation	$	601,706		$	703,148		$	512,206		$	(80,407	)	$	(1,134,947	)	$	601,706

Condensed Consolidating Financial Information for the Year Ended December 31, 2013

	Westlake Chemical Corporation			100% Owned Guarantor Subsidiaries			OpCo (Less Than 100% Owned Guarantor Subsidiary)			Non-Guarantor Subsidiaries			Eliminations			Consolidated
Statement of Operations
Net sales	$	—		$	3,195,406		$	2,127,747		$	48,016		$	(1,611,685	)	$	3,759,484
Cost of sales	—			2,971,258			1,255,140			43,333			(1,611,685		)	2,658,046
Gross profit	—			224,148			872,607			4,683			—			1,101,438
Selling, general and administrative expenses	2,128			114,211			25,451			6,184			—			147,974
(Loss) income from operations	(2,128		)	109,937			847,156			(1,501		)	—			953,464
Interest expense	(18,030		)	(52		)	(8,032		)	—			8,032			(18,082		)
Other income (expense), net	11,798			(2,438		)	7,701			(2,239		)	(8,032		)	6,790
(Loss) income before income taxes	(8,360		)	107,447			846,825			(3,740		)	—			942,172
(Benefit from) provision for income taxes	(2,031		)	34,340			300,279			(841		)	—			331,747
Equity in net income of subsidiaries	616,754			546,546			—			—			(1,163,300		)	—
Net income (loss) attributable to Westlake Chemical Corporation	$	610,425		$	619,653		$	546,546		$	(2,899	)	$	(1,163,300	)	$	610,425
Comprehensive income (loss) attributable to    Westlake Chemical Corporation	$	618,649		$	629,308		$	546,546		$	(4,506	)	$	(1,171,348	)	$	618,649

Condensed Consolidating Financial Information for the Year Ended December 31, 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	$	646,010		$	575,262		$	359,318		$	107,607		$	(1,023,152	)	$	665,045
Adjustments to reconcile net income to net cash    (used for) provided by operating activities
Depreciation and amortization	2,004			124,897			81,210			39,650			—			247,761
Deferred income taxes	(285		)	33,369			(456		)	7,156			—			39,784
Net changes in working capital and other	(660,777		)	(368,494		)	19,175			113,190			1,023,152			126,246
Net cash (used for) provided by operating activities	(13,048		)	365,034			459,247			267,603			—			1,078,836
Cash flows from investing activities
Acquisition of business, net of cash acquired	—			—			—			15,782			—			15,782
Additions to property, plant and equipment	—			(215,405		)	(231,185		)	(44,836		)	—			(491,426		)
Proceeds from disposition of assets	—			18			—			31			—			49
Proceeds from disposition of equity method investment	—			27,865			—			—			—			27,865
Proceeds from sales and maturities of securities	48,900			—			—			—			—			48,900
Purchase of securities	(556,211		)	(48,887		)	—			—			—			(605,098		)
Settlements of derivative instruments	—			(2,248		)	—			—			—			(2,248		)
Net cash used for investing activities	(507,311		)	(238,657		)	(231,185		)	(29,023		)	—			(1,006,176		)
Cash flows from financing activities
Intercompany financing	418,844			(585,007		)	156,368			9,795			—			—
Intercompany financing—OpCo	—			135,341			(135,341		)	—			—			—
Dividends paid	(91,551		)	—			—			—			—			(91,551		)
Distributions paid	—			327,060			(352,545		)	10,629			—			(14,856		)
Purchase of limited partner interests	—			—			135,341			(135,341		)	—			—
Proceeds from exercise of stock options	1,063			—			—			—			—			1,063
Proceeds from issuance of notes payable	—			—			—			52,960			—			52,960
Repayment of notes payable	—			—			—			(73,615		)	—			(73,615		)
Repurchase of common stock for treasury	(162,459		)	—			—			—			—			(162,459		)
Windfall tax benefits from share-based payment arrangements	1,646			—			—			—			—			1,646
Net cash provided by (used for) financing activities	$	167,543		$	(122,606	)	$	(196,177	)	$	(135,572	)	$	—		$	(286,812	)

	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	$	—		$	—	$	—	$	(3,924	)	$	—	$	(3,924	)
Net (decrease) increase in cash and cash equivalents	(352,816		)	3,771		31,885		99,084			—		(218,076		)
Cash and cash equivalents at beginning of the year	655,947			3,057		131,545		90,052			—		880,601
Cash and cash equivalents at end of the year	$	303,131		$	6,828	$	163,430	$	189,136		$	—	$	662,525

Condensed Consolidating Financial Information for the Year Ended December 31, 2014

	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 (loss)	$	678,523		$	708,940		$	512,206		$	(2,832	)	$	(1,211,821	)	$	685,016
Adjustments to reconcile net income (loss) to net cash (used for)    provided by operating activities
Depreciation and amortization	1,673			111,389			77,611			19,486			—			210,159
Deferred income taxes	(288		)	55,344			8,608			(4,697		)	—			58,967
Net changes in working capital and other	(706,043		)	(1,077,982		)	4,879			645,559			1,211,821			78,234
Net cash (used for) provided by operating activities	(26,135		)	(202,309		)	603,304			657,516			—			1,032,376
Cash flows from investing activities
Acquisition of business, net of cash acquired	—			—			—			(611,087		)	—			(611,087		)
Additions to property, plant and equipment	—			(209,111		)	(202,823		)	(19,170		)	—			(431,104		)
Proceeds from disposition of assets	—			180			—			1			—			181
Proceeds from repayment of loan acquired	—			—			—			45,923			—			45,923
Proceeds from sales and maturities of securities	342,045			—			—			—			—			342,045
Purchase of securities	(117,332		)	—			—			—			—			(117,332		)
Settlements of derivative instruments	—			(1,698		)	(133		)	—			—			(1,831		)
Net cash provided by (used for) investing activities	224,713			(210,629		)	(202,956		)	(584,333		)	—			(773,205		)
Cash flows from financing activities
Intercompany financing	155,665			(244,122		)	102,702			(14,245		)	—			—
Net distributions prior to Westlake Partners initial public offering	—			448,101			(448,101		)	—			—			—
Capitalized debt issuance costs	(1,186		)	—			—			—			—			(1,186		)
Dividends paid	(77,656		)	151,729			(151,729		)	—			—			(77,656		)
Distributions paid	—			54,060			(57,763		)	1,499			—			(2,204		)
Net proceeds from issuance of Westlake Partners common units	—			—			—			286,088			—			286,088
Purchase of limited partner interests	—			—			286,088			(286,088		)	—			—
Proceeds from exercise of stock options	5,524			—			—			—			—			5,524
Repurchase of common stock for treasury	(52,630		)	—			—			—			—			(52,630		)
Windfall tax benefits from share-based payment arrangements	6,704			—			—			—			—			6,704
Net cash provided by (used for) financing activities	$	36,421		$	409,768		$	(268,803	)	$	(12,746	)	$	—		$	164,640

	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	$	—	$	—		$	—	$	(4,511	)	$	—	$	(4,511	)
Net increase (decrease) in cash and cash equivalents	234,999		(3,170		)	131,545		55,926			—		419,300
Cash and cash equivalents at beginning of the year	420,948		6,227			—		34,126			—		461,301
Cash and cash equivalents at end of the year	$	655,947	$	3,057		$	131,545	$	90,052		$	—	$	880,601

Condensed Consolidating Financial Information for the Year Ended December 31, 2013

	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 (loss)	$	610,425		$	619,653		$	546,546		$	(2,899	)	$	(1,163,300	)	$	610,425
Adjustments to reconcile net income (loss) to net cash (used for)    provided by operating activities
Depreciation and amortization	1,459			81,897			73,463			2,448			—			159,267
Deferred income taxes	74			56,787			37,054			(183		)	—			93,732
Net changes in working capital and other	(622,194		)	(607,033		)	(54,554		)	9,786			1,163,300			(110,695		)
Net cash (used for) provided by operating activities	(10,236		)	151,304			602,509			9,152			—			752,729
Cash flows from investing activities
Acquisition of business	—			(178,309		)	—			—			—			(178,309		)
Additions to equity investments	—			(23,338		)	—			—			—			(23,338		)
Additions to property, plant and equipment	—			(453,538		)	(223,130		)	(2,554		)	—			(679,222		)
Construction of assets pending sale-leaseback	—			(136		)	—			—			—			(136		)
Proceeds from disposition of assets	—			75			—			76			—			151
Proceeds from repayment of loan to affiliate	—			—			—			167			—			167
Proceeds from sales and maturities of securities	252,519			—			—			—			—			252,519
Purchase of securities	(367,150		)	—			—			—			—			(367,150		)
Settlements of derivative instruments	—			—			(6,920		)	—			—			(6,920		)
Net cash used for investing activities	(114,631		)	(655,246		)	(230,050		)	(2,311		)	—			(1,002,238		)
Cash flows from financing activities
Intercompany financing	(128,798		)	(100,330		)	231,067			(1,939		)	—			—
Net distributions prior to Westlake Partners initial public offering	—			603,526			(603,526		)	—			—			—
Dividends paid	(55,236		)	—			—			—			—			(55,236		)
Proceeds from exercise of stock options	3,437			—			—			—			—			3,437
Repurchase of common stock for treasury	(32,918		)	—			—			—			—			(32,918		)
Windfall tax benefits from share-based payment arrangements	5,449			—			—			—			—			5,449
Net cash (used for) provided by financing activities	$	(208,066	)	$	503,196		$	(372,459	)	$	(1,939	)	$	—		$	(79,268	)

	Westlake Chemical Corporation			100% Owned Guarantor Subsidiaries			OpCo (Less Than 100% Owned Guarantor Subsidiary)		Non-Guarantor Subsidiaries		Eliminations		Consolidated
Net (decrease) increase in cash and cash equivalents	$	(332,933	)	$	(746	)	$	—	$	4,902	$	—	$	(328,777	)
Cash and cash equivalents at beginning of the year	753,881			6,973			—		29,224		—		790,078
Cash and cash equivalents at end of the year	$	420,948		$	6,227		$	—	$	34,126	$	—	$	461,301

Condensed Consolidating Financial Information Statement Of Operations

Condensed Consolidating Financial Information for the Year Ended December 31, 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	$	—		$	3,660,393		$	1,007,221		$	1,039,165		$	(1,243,443	)	$	4,463,336
Cost of sales	—			2,944,420			624,339			933,007			(1,223,621		)	3,278,145
Gross profit	—			715,973			382,882			106,158			(19,822		)	1,185,191
Selling, general and administrative expenses	2,478			167,431			20,138			55,139			(19,822		)	225,364
(Loss) income from operations	(2,478		)	548,542			362,744			51,019			—			959,827
Interest expense	(42,197		)	(10		)	(2,691		)	(521		)	10,763			(34,656		)
Other income (expense), net	19,614			1,033			(63		)	28,449			(10,763		)	38,270
(Loss) income before income taxes	(25,061		)	549,565			359,990			78,947			—			963,441
(Benefit from) provision for income taxes	(7,237		)	288,329			672			16,632			—			298,396
Equity in net income of subsidiaries	663,834			314,026			—			45,292			(1,023,152		)	—
Net income	646,010			575,262			359,318			107,607			(1,023,152		)	665,045
Net income attributable to noncontrolling interests	—			—			—			19,035			—			19,035
Net income attributable to Westlake Chemical Corporation	$	646,010		$	575,262		$	359,318		$	88,572		$	(1,023,152	)	$	646,010
Comprehensive income attributable to    Westlake Chemical Corporation	$	596,151		$	572,731		$	359,318		$	42,143		$	(974,192	)	$	596,151

Condensed Consolidating Financial Information for the Year Ended December 31, 2014

	Westlake Chemical Corporation			100% Owned Guarantor Subsidiaries			OpCo (Less Than 100% Owned Guarantor Subsidiary)			Non-Guarantor Subsidiaries			Eliminations			Consolidated
Statement of Operations
Net sales	$	—		$	3,727,361		$	1,749,700		$	475,401		$	(1,537,112	)	$	4,415,350
Cost of sales	—			3,162,246			1,003,888			447,676			(1,515,810		)	3,098,000
Gross profit	—			565,115			745,812			27,725			(21,302		)	1,317,350
Selling, general and administrative expenses	2,082			144,987			26,870			40,722			(21,302		)	193,359
(Loss) income from operations	(2,082		)	420,128			718,942			(12,997		)	—			1,123,991
Interest expense	(39,763		)	(10		)	(10,499		)	(492		)	13,412			(37,352		)
Other income (expense), net	21,001			(4,921		)	3,151			(8,540		)	(13,412		)	(2,721		)
(Loss) income before income taxes	(20,844		)	415,197			711,594			(22,029		)	—			1,083,918
Provision for (benefit from) income taxes	248			202,501			199,388			(3,235		)	—			398,902
Equity in net income of subsidiaries	699,615			496,244			—			15,962			(1,211,821		)	—
Net income (loss)	678,523			708,940			512,206			(2,832		)	(1,211,821		)	685,016
Net income attributable to noncontrolling interests	—			—			—			6,493			—			6,493
Net income (loss) attributable to Westlake Chemical Corporation	$	678,523		$	708,940		$	512,206		$	(9,325	)	$	(1,211,821	)	$	678,523
Comprehensive income (loss) attributable to    Westlake Chemical Corporation	$	601,706		$	703,148		$	512,206		$	(80,407	)	$	(1,134,947	)	$	601,706

Condensed Consolidating Financial Information for the Year Ended December 31, 2013

	Westlake Chemical Corporation			100% Owned Guarantor Subsidiaries			OpCo (Less Than 100% Owned Guarantor Subsidiary)			Non-Guarantor Subsidiaries			Eliminations			Consolidated
Statement of Operations
Net sales	$	—		$	3,195,406		$	2,127,747		$	48,016		$	(1,611,685	)	$	3,759,484
Cost of sales	—			2,971,258			1,255,140			43,333			(1,611,685		)	2,658,046
Gross profit	—			224,148			872,607			4,683			—			1,101,438
Selling, general and administrative expenses	2,128			114,211			25,451			6,184			—			147,974
(Loss) income from operations	(2,128		)	109,937			847,156			(1,501		)	—			953,464
Interest expense	(18,030		)	(52		)	(8,032		)	—			8,032			(18,082		)
Other income (expense), net	11,798			(2,438		)	7,701			(2,239		)	(8,032		)	6,790
(Loss) income before income taxes	(8,360		)	107,447			846,825			(3,740		)	—			942,172
(Benefit from) provision for income taxes	(2,031		)	34,340			300,279			(841		)	—			331,747
Equity in net income of subsidiaries	616,754			546,546			—			—			(1,163,300		)	—
Net income (loss) attributable to Westlake Chemical Corporation	$	610,425		$	619,653		$	546,546		$	(2,899	)	$	(1,163,300	)	$	610,425
Comprehensive income (loss) attributable to    Westlake Chemical Corporation	$	618,649		$	629,308		$	546,546		$	(4,506	)	$	(1,171,348	)	$	618,649

Condensed Consolidating Financial Information Statement Of Cash Flows

Condensed Consolidating Financial Information for the Year Ended December 31, 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	$	646,010		$	575,262		$	359,318		$	107,607		$	(1,023,152	)	$	665,045
Adjustments to reconcile net income to net cash    (used for) provided by operating activities
Depreciation and amortization	2,004			124,897			81,210			39,650			—			247,761
Deferred income taxes	(285		)	33,369			(456		)	7,156			—			39,784
Net changes in working capital and other	(660,777		)	(368,494		)	19,175			113,190			1,023,152			126,246
Net cash (used for) provided by operating activities	(13,048		)	365,034			459,247			267,603			—			1,078,836
Cash flows from investing activities
Acquisition of business, net of cash acquired	—			—			—			15,782			—			15,782
Additions to property, plant and equipment	—			(215,405		)	(231,185		)	(44,836		)	—			(491,426		)
Proceeds from disposition of assets	—			18			—			31			—			49
Proceeds from disposition of equity method investment	—			27,865			—			—			—			27,865
Proceeds from sales and maturities of securities	48,900			—			—			—			—			48,900
Purchase of securities	(556,211		)	(48,887		)	—			—			—			(605,098		)
Settlements of derivative instruments	—			(2,248		)	—			—			—			(2,248		)
Net cash used for investing activities	(507,311		)	(238,657		)	(231,185		)	(29,023		)	—			(1,006,176		)
Cash flows from financing activities
Intercompany financing	418,844			(585,007		)	156,368			9,795			—			—
Intercompany financing—OpCo	—			135,341			(135,341		)	—			—			—
Dividends paid	(91,551		)	—			—			—			—			(91,551		)
Distributions paid	—			327,060			(352,545		)	10,629			—			(14,856		)
Purchase of limited partner interests	—			—			135,341			(135,341		)	—			—
Proceeds from exercise of stock options	1,063			—			—			—			—			1,063
Proceeds from issuance of notes payable	—			—			—			52,960			—			52,960
Repayment of notes payable	—			—			—			(73,615		)	—			(73,615		)
Repurchase of common stock for treasury	(162,459		)	—			—			—			—			(162,459		)
Windfall tax benefits from share-based payment arrangements	1,646			—			—			—			—			1,646
Net cash provided by (used for) financing activities	$	167,543		$	(122,606	)	$	(196,177	)	$	(135,572	)	$	—		$	(286,812	)

	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	$	—		$	—	$	—	$	(3,924	)	$	—	$	(3,924	)
Net (decrease) increase in cash and cash equivalents	(352,816		)	3,771		31,885		99,084			—		(218,076		)
Cash and cash equivalents at beginning of the year	655,947			3,057		131,545		90,052			—		880,601
Cash and cash equivalents at end of the year	$	303,131		$	6,828	$	163,430	$	189,136		$	—	$	662,525

Condensed Consolidating Financial Information for the Year Ended December 31, 2014

	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 (loss)	$	678,523		$	708,940		$	512,206		$	(2,832	)	$	(1,211,821	)	$	685,016
Adjustments to reconcile net income (loss) to net cash (used for)    provided by operating activities
Depreciation and amortization	1,673			111,389			77,611			19,486			—			210,159
Deferred income taxes	(288		)	55,344			8,608			(4,697		)	—			58,967
Net changes in working capital and other	(706,043		)	(1,077,982		)	4,879			645,559			1,211,821			78,234
Net cash (used for) provided by operating activities	(26,135		)	(202,309		)	603,304			657,516			—			1,032,376
Cash flows from investing activities
Acquisition of business, net of cash acquired	—			—			—			(611,087		)	—			(611,087		)
Additions to property, plant and equipment	—			(209,111		)	(202,823		)	(19,170		)	—			(431,104		)
Proceeds from disposition of assets	—			180			—			1			—			181
Proceeds from repayment of loan acquired	—			—			—			45,923			—			45,923
Proceeds from sales and maturities of securities	342,045			—			—			—			—			342,045
Purchase of securities	(117,332		)	—			—			—			—			(117,332		)
Settlements of derivative instruments	—			(1,698		)	(133		)	—			—			(1,831		)
Net cash provided by (used for) investing activities	224,713			(210,629		)	(202,956		)	(584,333		)	—			(773,205		)
Cash flows from financing activities
Intercompany financing	155,665			(244,122		)	102,702			(14,245		)	—			—
Net distributions prior to Westlake Partners initial public offering	—			448,101			(448,101		)	—			—			—
Capitalized debt issuance costs	(1,186		)	—			—			—			—			(1,186		)
Dividends paid	(77,656		)	151,729			(151,729		)	—			—			(77,656		)
Distributions paid	—			54,060			(57,763		)	1,499			—			(2,204		)
Net proceeds from issuance of Westlake Partners common units	—			—			—			286,088			—			286,088
Purchase of limited partner interests	—			—			286,088			(286,088		)	—			—
Proceeds from exercise of stock options	5,524			—			—			—			—			5,524
Repurchase of common stock for treasury	(52,630		)	—			—			—			—			(52,630		)
Windfall tax benefits from share-based payment arrangements	6,704			—			—			—			—			6,704
Net cash provided by (used for) financing activities	$	36,421		$	409,768		$	(268,803	)	$	(12,746	)	$	—		$	164,640

	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	$	—	$	—		$	—	$	(4,511	)	$	—	$	(4,511	)
Net increase (decrease) in cash and cash equivalents	234,999		(3,170		)	131,545		55,926			—		419,300
Cash and cash equivalents at beginning of the year	420,948		6,227			—		34,126			—		461,301
Cash and cash equivalents at end of the year	$	655,947	$	3,057		$	131,545	$	90,052		$	—	$	880,601

Condensed Consolidating Financial Information for the Year Ended December 31, 2013

	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 (loss)	$	610,425		$	619,653		$	546,546		$	(2,899	)	$	(1,163,300	)	$	610,425
Adjustments to reconcile net income (loss) to net cash (used for)    provided by operating activities
Depreciation and amortization	1,459			81,897			73,463			2,448			—			159,267
Deferred income taxes	74			56,787			37,054			(183		)	—			93,732
Net changes in working capital and other	(622,194		)	(607,033		)	(54,554		)	9,786			1,163,300			(110,695		)
Net cash (used for) provided by operating activities	(10,236		)	151,304			602,509			9,152			—			752,729
Cash flows from investing activities
Acquisition of business	—			(178,309		)	—			—			—			(178,309		)
Additions to equity investments	—			(23,338		)	—			—			—			(23,338		)
Additions to property, plant and equipment	—			(453,538		)	(223,130		)	(2,554		)	—			(679,222		)
Construction of assets pending sale-leaseback	—			(136		)	—			—			—			(136		)
Proceeds from disposition of assets	—			75			—			76			—			151
Proceeds from repayment of loan to affiliate	—			—			—			167			—			167
Proceeds from sales and maturities of securities	252,519			—			—			—			—			252,519
Purchase of securities	(367,150		)	—			—			—			—			(367,150		)
Settlements of derivative instruments	—			—			(6,920		)	—			—			(6,920		)
Net cash used for investing activities	(114,631		)	(655,246		)	(230,050		)	(2,311		)	—			(1,002,238		)
Cash flows from financing activities
Intercompany financing	(128,798		)	(100,330		)	231,067			(1,939		)	—			—
Net distributions prior to Westlake Partners initial public offering	—			603,526			(603,526		)	—			—			—
Dividends paid	(55,236		)	—			—			—			—			(55,236		)
Proceeds from exercise of stock options	3,437			—			—			—			—			3,437
Repurchase of common stock for treasury	(32,918		)	—			—			—			—			(32,918		)
Windfall tax benefits from share-based payment arrangements	5,449			—			—			—			—			5,449
Net cash (used for) provided by financing activities	$	(208,066	)	$	503,196		$	(372,459	)	$	(1,939	)	$	—		$	(79,268	)

	Westlake Chemical Corporation			100% Owned Guarantor Subsidiaries			OpCo (Less Than 100% Owned Guarantor Subsidiary)		Non-Guarantor Subsidiaries		Eliminations		Consolidated
Net (decrease) increase in cash and cash equivalents	$	(332,933	)	$	(746	)	$	—	$	4,902	$	—	$	(328,777	)
Cash and cash equivalents at beginning of the year	753,881			6,973			—		29,224		—		790,078
Cash and cash equivalents at end of the year	$	420,948		$	6,227		$	—	$	34,126	$	—	$	461,301