Guarantor Disclosures (Tables)

6 Months Ended

Jun. 30, 2015

Guarantees [Abstract]

Condensed Consolidating Financial Information Balance Sheet

Condensed Consolidating Financial Information as of June 30, 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	$	756,385	$	3,923	$	133,890	$	132,371	$	—		$	1,026,569
Accounts receivable, net	13,335		1,995,787		57,957		144,560		(1,610,917		)	600,722
Inventories	—		376,750		3,856		105,691		—			486,297
Prepaid expenses and other current assets	136		20,981		30		4,132		(2,261		)	23,018
Deferred income taxes	409		29,832		—		279		(886		)	29,634
Total current assets	770,265		2,427,273		195,733		387,033		(1,614,064		)	2,166,240
Property, plant and equipment, net	—		1,520,734		914,270		420,504		—			2,855,508
Equity investments	4,690,426		1,228,964		—		467,530		(6,349,174		)	37,746
Other assets, net	18,920		300,172		50,018		133,840		(151,434		)	351,516
Total assets	$	5,479,611	$	5,477,143	$	1,160,021	$	1,408,907	$	(8,114,672	)	$	5,411,010
Current liabilities
Accounts and notes payable	$	1,594,555	$	145,719	$	36,339	$	104,954	$	(1,598,589	)	$	282,978
Accrued liabilities	8,501		173,112		16,441		69,101		(15,475		)	251,680
Total current liabilities	1,603,056		318,831		52,780		174,055		(1,614,064		)	534,658
Long-term debt	753,167		10,889		145,651		—		(145,651		)	764,056
Deferred income taxes	—		498,993		1,614		37,520		(5,783		)	532,344
Other liabilities	—		39,553		—		123,224		—			162,777
Total liabilities	2,356,223		868,266		200,045		334,799		(1,765,498		)	1,993,835
Total Westlake Chemical Corporation stockholders' equity	3,123,388		4,608,877		959,976		780,321		(6,349,174		)	3,123,388
Noncontrolling interests	—		—		—		293,787		—			293,787
Total equity	3,123,388		4,608,877		959,976		1,074,108		(6,349,174		)	3,417,175
Total liabilities and equity	$	5,479,611	$	5,477,143	$	1,160,021	$	1,408,907	$	(8,114,672	)	$	5,411,010

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 Statement Of Operations

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 for the Three Months Ended June 30, 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	$	—		$	879,842		$	524,135		$	11,753		$	(417,154	)	$	998,576
Cost of sales	—			821,234			277,589			10,936			(417,154		)	692,605
Gross profit	—			58,608			246,546			817			—			305,971
Selling, general and administrative expenses	529			31,066			6,165			1,423			—			39,183
(Loss) income from operations	(529		)	27,542			240,381			(606		)	—			266,788
Interest expense	(9,535		)	(4		)	(4,105		)	—			4,105			(9,539		)
Other income (expense), net	7,137			965			1,397			(793		)	(4,105		)	4,601
(Loss) income before income taxes	(2,927		)	28,503			237,673			(1,399		)	—			261,850
(Benefit from) provision for income taxes	(1,039		)	9,766			83,829			(149		)	—			92,407
Equity in net income of subsidiaries	171,331			153,844			—			—			(325,175		)	—
Net income (loss) attributable to Westlake Chemical Corporation	$	169,443		$	172,581		$	153,844		$	(1,250	)	$	(325,175	)	$	169,443
Comprehensive income (loss) attributable to    Westlake Chemical Corporation	$	171,093		$	172,701		$	153,844		$	(442	)	$	(326,103	)	$	171,093

Condensed Consolidating Financial Information Statement Of Cash Flows

Condensed Consolidating Financial Information as of June 30, 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	$	756,385	$	3,923	$	133,890	$	132,371	$	—		$	1,026,569
Accounts receivable, net	13,335		1,995,787		57,957		144,560		(1,610,917		)	600,722
Inventories	—		376,750		3,856		105,691		—			486,297
Prepaid expenses and other current assets	136		20,981		30		4,132		(2,261		)	23,018
Deferred income taxes	409		29,832		—		279		(886		)	29,634
Total current assets	770,265		2,427,273		195,733		387,033		(1,614,064		)	2,166,240
Property, plant and equipment, net	—		1,520,734		914,270		420,504		—			2,855,508
Equity investments	4,690,426		1,228,964		—		467,530		(6,349,174		)	37,746
Other assets, net	18,920		300,172		50,018		133,840		(151,434		)	351,516
Total assets	$	5,479,611	$	5,477,143	$	1,160,021	$	1,408,907	$	(8,114,672	)	$	5,411,010
Current liabilities
Accounts and notes payable	$	1,594,555	$	145,719	$	36,339	$	104,954	$	(1,598,589	)	$	282,978
Accrued liabilities	8,501		173,112		16,441		69,101		(15,475		)	251,680
Total current liabilities	1,603,056		318,831		52,780		174,055		(1,614,064		)	534,658
Long-term debt	753,167		10,889		145,651		—		(145,651		)	764,056
Deferred income taxes	—		498,993		1,614		37,520		(5,783		)	532,344
Other liabilities	—		39,553		—		123,224		—			162,777
Total liabilities	2,356,223		868,266		200,045		334,799		(1,765,498		)	1,993,835
Total Westlake Chemical Corporation stockholders' equity	3,123,388		4,608,877		959,976		780,321		(6,349,174		)	3,123,388
Noncontrolling interests	—		—		—		293,787		—			293,787
Total equity	3,123,388		4,608,877		959,976		1,074,108		(6,349,174		)	3,417,175
Total liabilities and equity	$	5,479,611	$	5,477,143	$	1,160,021	$	1,408,907	$	(8,114,672	)	$	5,411,010

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 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 for the Three Months Ended June 30, 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	$	—		$	879,842		$	524,135		$	11,753		$	(417,154	)	$	998,576
Cost of sales	—			821,234			277,589			10,936			(417,154		)	692,605
Gross profit	—			58,608			246,546			817			—			305,971
Selling, general and administrative expenses	529			31,066			6,165			1,423			—			39,183
(Loss) income from operations	(529		)	27,542			240,381			(606		)	—			266,788
Interest expense	(9,535		)	(4		)	(4,105		)	—			4,105			(9,539		)
Other income (expense), net	7,137			965			1,397			(793		)	(4,105		)	4,601
(Loss) income before income taxes	(2,927		)	28,503			237,673			(1,399		)	—			261,850
(Benefit from) provision for income taxes	(1,039		)	9,766			83,829			(149		)	—			92,407
Equity in net income of subsidiaries	171,331			153,844			—			—			(325,175		)	—
Net income (loss) attributable to Westlake Chemical Corporation	$	169,443		$	172,581		$	153,844		$	(1,250	)	$	(325,175	)	$	169,443
Comprehensive income (loss) attributable to    Westlake Chemical Corporation	$	171,093		$	172,701		$	153,844		$	(442	)	$	(326,103	)	$	171,093

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 Operations
Net sales	$	—		$	1,901,365		$	510,096		$	496,007		$	(618,935	)	$	2,288,533
Cost of sales	—			1,485,728			319,341			454,553			(608,816		)	1,650,806
Gross profit	—			415,637			190,755			41,454			(10,119		)	637,727
Selling, general and administrative expenses	812			86,366			10,237			25,777			(10,119		)	113,073
(Loss) income from operations	(812		)	329,271			180,518			15,677			—			524,654
Interest expense	(21,321		)	(5		)	(2,232		)	(94		)	5,103			(18,549		)
Other income (expense), net	16,387			(6,544		)	39			26,375			(5,103		)	31,154
(Loss) income before income taxes	(5,746		)	322,722			178,325			41,958			—			537,259
(Benefit from) provision for income taxes	(1,976		)	175,170			426			3,171			—			176,791
Equity in net income of subsidiaries	355,207			156,690			—			21,209			(533,106		)	—
Net income	351,437			304,242			177,899			59,996			(533,106		)	360,468
Net income attributable to noncontrolling interests	—			—			—			9,031			—			9,031
Net income attributable to Westlake Chemical Corporation	$	351,437		$	304,242		$	177,899		$	50,965		$	(533,106	)	$	351,437
Comprehensive income attributable to    Westlake Chemical Corporation	$	310,946		$	304,620		$	177,899		$	9,513		$	(492,032	)	$	310,946

Condensed Consolidating Financial Information for the Six Months Ended June 30, 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	$	—		$	1,724,184		$	1,084,149		$	20,870		$	(802,951	)	$	2,026,252
Cost of sales	—			1,611,811			605,289			19,122			(802,951		)	1,433,271
Gross profit	—			112,373			478,860			1,748			—			592,981
Selling, general and administrative expenses	1,075			60,351			13,943			2,769			—			78,138
(Loss) income from operations	(1,075		)	52,022			464,917			(1,021		)	—			514,843
Interest expense	(18,690		)	(6		)	(7,696		)	—			7,696			(18,696		)
Other income (expense), net	12,351			1,213			2,649			(1,407		)	(7,696		)	7,110
(Loss) income before income taxes	(7,414		)	53,229			459,870			(2,428		)	—			503,257
(Benefit from) provision for income taxes	(2,597		)	16,553			162,152			(326		)	—			175,782
Equity in net income of subsidiaries	332,292			297,718			—			—			(630,010		)	—
Net income (loss) attributable to Westlake Chemical Corporation	$	327,475		$	334,394		$	297,718		$	(2,102	)	$	(630,010	)	$	327,475
Comprehensive income (loss) attributable to    Westlake Chemical Corporation	$	329,959		$	334,649		$	297,718		$	(2,192	)	$	(630,175	)	$	329,959

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

Condensed Consolidating Financial Information for the Six Months Ended June 30, 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)	$	327,475		$	334,394		$	297,718		$	(2,102	)	$	(630,010	)	$	327,475
Adjustments to reconcile net income (loss) to net cash (used for)    provided by operating activities
Depreciation and amortization	730			54,121			39,282			1,071			—			95,204
Deferred income taxes	(292		)	12,931			6,813			(93		)	—			19,359
Net changes in working capital and other	(336,669		)	(336,097		)	35,108			(2,148		)	630,010			(9,796		)
Net cash (used for) provided by operating activities	(8,756		)	65,349			378,921			(3,272		)	—			432,242
Cash flows from investing activities
Additions to property, plant and equipment	—			(110,338		)	(106,191		)	(383		)	—			(216,912		)
Proceeds from disposition of assets	—			12			—			1			—			13
Proceeds from sales and maturities of securities	342,045			—			—			—			—			342,045
Purchase of securities	(117,332		)	—			—			—			—			(117,332		)
Settlements of derivative instruments	—			—			(290		)	—			—			(290		)
Net cash provided by (used for) investing activities	224,713			(110,326		)	(106,481		)	(382		)	—			7,524
Cash flows from financing activities
Intercompany financing	221,745			(329,044		)	104,173			3,126			—			—
Net distributions prior to Westlake Partners initial public offering	—			376,613			(376,613		)	—			—			—
Dividends paid	(33,623		)	—			—			—			—			(33,623		)
Proceeds from exercise of stock options	4,187			—			—			—			—			4,187
Windfall tax benefits from share-based payment arrangements	4,436			—			—			—			—			4,436
Net cash provided by (used for) financing activities	196,745			47,569			(272,440		)	3,126			—			(25,000		)
Net increase (decrease) in cash and cash equivalents	412,702			2,592			—			(528		)	—			414,766
Cash and cash equivalents at beginning of period	420,948			6,227			—			34,126			—			461,301
Cash and cash equivalents at end of period	$	833,650		$	8,819		$	—		$	33,598		$	—		$	876,067