10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 10-Q

x	QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
	For the quarterly period ended March 31, 2014

or

¨	TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
	For the Transition Period from                    to

Commission File No. 001-32260

Westlake Chemical Corporation

(Exact name of Registrant as specified in its charter)

Delaware	76-0346924
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification Number)

2801 Post Oak Boulevard, Suite 600

Houston, Texas 77056

(Address of principal executive offices, including zip code)

(713) 960-9111

(Registrant's telephone number, including area code)

Indicate by check mark whether the registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.     YesxNo¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).     YesxNo¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, or a smaller reporting company. See definitions of "large accelerated filer," "accelerated filer" and "smaller reporting company" in Rule 12b-2 of the Exchange Act (Check one):

Large accelerated filer	x	Accelerated filer	¨
Non-accelerated filer	¨  (Do not check if a smaller reporting company)	Smaller reporting company	¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act)     Yes¨Nox

The number of shares outstanding of the registrant's sole class of common stock as of April 29, 2014 was 133,429,082 (on a post-split basis).

INDEX

Item	Page
PART I. FINANCIAL INFORMATION
1) Financial Statements	1
2) Management's Discussion and Analysis of Financial Condition and Results of Operations	22
3) Quantitative and Qualitative Disclosures about Market Risk	30
4) Controls and Procedures	30
PART II. OTHER INFORMATION
1) Legal Proceedings	31
1A) Risk Factors	31
2) Unregistered Sales of Equity Securities and Use of Proceeds	31
6) Exhibits	32

PART I. FINANCIAL INFORMATION

Item 1. Financial Statements

WESTLAKE CHEMICAL CORPORATION

CONSOLIDATED BALANCE SHEETS

(Unaudited)

	March 31, 2014			December 31, 2013
	(in thousands of dollars, except par values and share amounts)
ASSETS
Current assets
Cash and cash equivalents	$	532,643		$	461,301
Marketable securities	243,694			239,388
Accounts receivable, net	421,879			428,457
Inventories	439,009			471,879
Prepaid expenses and other current assets	15,880			13,888
Deferred income taxes	34,158			34,169
Total current assets	1,687,263			1,649,082
Property, plant and equipment, net	2,150,643			2,088,014
Equity investments	67,560			66,875
Other assets, net
Intangible assets, net	157,086			159,046
Deferred charges and other assets, net	109,404			97,892
Total other assets, net	266,490			256,938
Total assets	$	4,171,956		$	4,060,909
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities
Accounts payable	$	211,952		$	249,613
Accrued liabilities	147,982			155,245
Total current liabilities	359,934			404,858
Long-term debt	763,909			763,879
Deferred income taxes	447,203			437,976
Other liabilities	32,338			35,593
Total liabilities	1,603,384			1,642,306
Commitments and contingencies (Notes 7 and 15)
Stockholders' equity
Preferred stock, $0.01 par value, 50,000,000 shares authorized;    no shares issued and outstanding	—			—
Common stock, $0.01 par value, 150,000,000 shares authorized;    134,682,004 and 134,580,208 shares issued at March 31, 2014    and December 31, 2013, respectively (Note 1)	1,347			1,346
Common stock, held in treasury, at cost; 1,252,922 shares    at March 31, 2014 and December 31, 2013 (Note 1)	(46,220		)	(46,220		)
Additional paid-in capital	519,323			511,432
Retained earnings	2,095,904			1,954,661
Accumulated other comprehensive loss	(1,782		)	(2,616		)
Total stockholders' equity	2,568,572			2,418,603
Total liabilities and stockholders' equity	$	4,171,956		$	4,060,909

The accompanying notes are an integral part of these consolidated financial statements.

1

WESTLAKE CHEMICAL CORPORATION

CONSOLIDATED STATEMENTS OF OPERATIONS

(Unaudited)

	Three Months Ended March 31,
	2014			2013
	(in thousands of dollars, except per share data and share amounts)
Net sales	$	1,027,676		$	864,647
Cost of sales	740,666			636,838
Gross profit	287,010			227,809
Selling, general and administrative expenses	38,955			33,754
Income from operations	248,055			194,055
Other income (expense)
Interest expense	(9,157		)	(6,281		)
Other income, net	2,509			3,519
Income before income taxes	241,407			191,293
Provision for income taxes	83,375			67,946
Net income	$	158,032		$	123,347
Earnings per share (Note 1):
Basic	$	1.18		$	0.92
Diluted	$	1.18		$	0.92
Weighted average shares outstanding (Note 1):
Basic	133,072,254			133,251,071
Diluted	133,612,924			133,817,737
Dividends per common share (Note 1)	$	0.1260		$	0.0938

The accompanying notes are an integral part of these consolidated financial statements.

2

WESTLAKE CHEMICAL CORPORATION

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(Unaudited)

	Three Months Ended March 31,
	2014			2013
	(in thousands of dollars)
Net income	$	158,032		$	123,347
Other comprehensive income (loss), net of income taxes
Pension and other post-retirement benefits liability
Amortization of benefits liability	219			614
Income tax provision on pension and other post-retirement benefits liability	(84		)	(236		)
Foreign currency translation adjustments	(898		)	(570		)
Available-for-sale investments
Unrealized holding gains on investments	2,467			—
Reclassification of net realized loss to net income	25			—
Income tax provision on available-for-sale investments	(895		)	—
Other comprehensive income (loss)	834			(192		)
Comprehensive income	$	158,866		$	123,155

The accompanying notes are an integral part of these consolidated financial statements.

3

WESTLAKE CHEMICAL CORPORATION

CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited)

	Three Months Ended March 31,
	2014			2013
	(in thousands of dollars)
Cash flows from operating activities
Net income	$	158,032		$	123,347
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	45,972			35,356
(Recovery of) provision for doubtful accounts	(144		)	393
Amortization of debt issuance costs	365			365
Stock-based compensation expense	2,222			1,499
Loss from disposition of fixed assets	855			2,387
Deferred income taxes	8,275			29,466
Windfall tax benefits from share-based payment arrangements	(3,512		)	(3,844		)
Income from equity method investments, net of dividends	(685		)	(178		)
Other loss, net	444			—
Changes in operating assets and liabilities
Accounts receivable	5,332			(7,917		)
Inventories	32,870			(8,776		)
Prepaid expenses and other current assets	(1,478		)	(2,077		)
Accounts payable	(29,706		)	14,733
Accrued liabilities	(4,952		)	(14,670		)
Other, net	(1,385		)	(53,832		)
Net cash provided by operating activities	212,505			116,252
Cash flows from investing activities
Additions to property, plant and equipment	(110,741		)	(150,784		)
Proceeds from disposition of assets	12			2
Proceeds from repayment of loan to affiliate	—			167
Proceeds from sales and maturities of securities	30,119			124,873
Purchase of securities	(49,025		)	(94,903		)
Settlements of derivative instruments	(409		)	(679		)
Net cash used for investing activities	(130,044		)	(121,324		)
Cash flows from financing activities
Dividends paid	(16,789		)	(12,553		)
Proceeds from exercise of stock options	2,158			1,590
Windfall tax benefits from share-based payment arrangements	3,512			3,844
Net cash used for financing activities	(11,119		)	(7,119		)
Net increase (decrease) in cash and cash equivalents	71,342			(12,191		)
Cash and cash equivalents at beginning of period	461,301			790,078
Cash and cash equivalents at end of period	$	532,643		$	777,887

The accompanying notes are an integral part of these consolidated financial statements.

4

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

1. Basis of Financial Statements

The accompanying unaudited consolidated interim financial statements were prepared in accordance with the rules and regulations of the Securities and Exchange Commission (the "SEC") for interim periods. Accordingly, certain information and footnotes required for complete financial statements under generally accepted accounting principles in the United States ("U.S. GAAP") have not been included. These interim consolidated financial statements should be read in conjunction with the December 31, 2013 financial statements and notes thereto of Westlake Chemical Corporation (the "Company") included in the annual report on Form 10-K for the fiscal year ended December 31, 2013 (the "2013 Form 10-K"), filed with the SEC on February 21, 2014. These financial statements have been prepared in conformity with the accounting principles and practices as disclosed in the notes to the consolidated financial statements of the Company for the fiscal year ended December 31, 2013.

In the opinion of the Company's management, the accompanying unaudited consolidated interim financial statements reflect all adjustments (consisting only of normal recurring adjustments) that are necessary for a fair statement of the Company's financial position as of March 31, 2014, its results of operations for the three months ended March 31, 2014 and 2013 and the changes in its cash position for the three months ended March 31, 2014 and 2013.

Results of operations and changes in cash position for the interim periods presented are not necessarily indicative of the results that will be realized for the fiscal year ending December 31, 2014 or any other interim period. The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses and the disclosure of contingent assets and liabilities. Actual results could differ from those estimates.

On February 14, 2014, the Company's Board of Directors authorized a two-for-one split of the Company's common stock. Stockholders of record as of February 28, 2014 were entitled to one additional share for every share outstanding, which was distributed on March 18, 2014. The total number of authorized common stock shares and associated par value were unchanged by this stock split. All share amounts and per share data included in the accompanying consolidated financial statements and related notes have been restated to reflect the effect of the stock split.

Recent Accounting Pronouncements

There are no recently issued accounting standards which are expected to impact the Company's consolidated financial position, results of operations or cash flows.

2. Financial Instruments

Cash Equivalents

The Company had $411,527 and $263,967 of held-to-maturity securities with original maturities of three months or less, primarily consisting of corporate debt securities, classified as cash equivalents at March 31, 2014 and December 31, 2013, respectively. The Company's investments in held-to-maturity securities are held at amortized cost, which approximates fair value.

Available-for-Sale Marketable Securities

Investments in available-for-sale securities were classified as follows:

	March 31, 2014		December 31, 2013
Current	$	243,694	$	239,388
Non-current	17,195		—
Total available-for-sale securities	$	260,889	$	239,388

5

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

The cost, gross unrealized gains, gross unrealized losses and fair value of the Company’s available-for-sale securities were as follows:

	March 31, 2014
	Cost		Gross Unrealized Gains		Gross Unrealized Losses (1)			Fair Value
Debt securities
Corporate bonds	$	116,669	$	470	$	(41	)	$	117,098
U.S. government debt (2)	102,201		133		(46		)	102,288
Asset-backed securities	24,268		47		(7		)	24,308
Equity securities	14,985		2,210		—			17,195
Total available-for-sale securities	$	258,123	$	2,860	$	(94	)	$	260,889

	December 31, 2013
	Cost		Gross Unrealized Gains		Gross Unrealized Losses (1)			Fair Value
Debt securities
Corporate bonds	$	108,300	$	340	$	(69	)	$	108,571
U.S. government debt (2)	106,335		60		(79		)	106,316
Asset-backed securities	24,478		34		(11		)	24,501
Total available-for-sale securities	$	239,113	$	434	$	(159	)	$	239,388

_____________

(1) All unrealized loss positions were held at a loss for less than 12 months.

(2) U.S. Treasury obligations, U.S. government agency obligations and U.S government agency mortgage-backed securities.

As of March 31, 2014 and December 31, 2013, net unrealized gains on the Company's available-for-sale securities of $1,773 and $176, respectively, net of income tax expense of $993 and $99, respectively, were recorded in accumulated other comprehensive income. See Note 10 for the fair value hierarchy of the Company’s available-for-sale securities.

As of March 31, 2014, the corporate bond securities held by the Company had maturities between one month to five years; U.S. government debt securities, excluding U.S. government agency mortgage-backed securities, had maturities between one month to four years; U.S. government agency mortgage-backed securities had maturities between one to 29 years; and asset-backed securities had maturities between one to six years.

The proceeds from sales and maturities of available-for-sale securities and the gross realized gains and losses included in the consolidated statement of operations are reflected in the table below. The cost of securities sold was determined using the specific identification method. There were no sales or maturities of available-for-sale securities during the three months ended March 31, 2013.

	Three Months Ended March 31,
	2014
Proceeds from sales and maturities of securities	$	30,119
Gross realized gains	13
Gross realized losses	(38		)

6

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

3. Accounts Receivable

Accounts receivable consist of the following:

	March 31, 2014			December 31, 2013
Trade customers	$	415,812		$	410,302
Affiliates	287			315
Allowance for doubtful accounts	(11,592		)	(11,741		)
	404,507			398,876
Federal and state taxes	5,248			20,820
Other	12,124			8,761
Accounts receivable, net	$	421,879		$	428,457

4. Inventories

Inventories consist of the following:

	March 31, 2014		December 31, 2013
Finished products	$	240,339	$	232,658
Feedstock, additives and chemicals	139,189		180,646
Materials and supplies	59,481		58,575
Inventories	$	439,009	$	471,879

5. Property, Plant and Equipment

As of March 31, 2014, the Company had property, plant and equipment, net totaling $2,150,643. The Company assesses these assets for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable, including when negative conditions such as significant current or projected operating losses exist. Other factors considered by the Company when determining if an impairment assessment is necessary include, but are not limited to, significant changes or projected changes in supply and demand fundamentals (which would have a negative impact on operating rates or margins), new technological developments, new competitors with significant raw material or other cost advantages, adverse changes associated with the U.S. and world economies and uncertainties associated with governmental actions. Long-lived assets assessed for impairment are grouped at the lowest level for which identifiable cash flows are largely independent of the cash flows of other assets and liabilities.

Depreciation expense on property, plant and equipment of $38,061 and $30,920 is included in cost of sales in the consolidated statements of operations for the three months ended March 31, 2014 and 2013, respectively.

6. Other Assets

Goodwill for the Olefins segment was $29,990 at March 31, 2014 and December 31, 2013. Goodwill for the Vinyls segment was $32,026 at March 31, 2014 and December 31, 2013. There were no changes in the carrying amount of goodwill by operating segments for the three months ended March 31, 2014.

Amortization expense on intangible and other assets of $8,276 and $4,801 is included in the consolidated statements of operations for the three months ended March 31, 2014 and 2013, respectively.

7

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

7. Long-Term Debt

Long-term debt consists of the following:

	March 31, 2014		December 31, 2013
3.60% senior notes due 2022	$	249,020	$	248,990
6 ½% senior notes due 2029	100,000		100,000
6 ¾% senior notes due 2032	250,000		250,000
6 ½% senior notes due 2035 (the "6 ½% GO Zone Senior Notes Due 2035")	89,000		89,000
6 ½% senior notes due 2035 (the "6 ½% IKE Zone Senior Notes Due 2035")	65,000		65,000
Loan related to tax-exempt waste disposal revenue bonds due 2027	10,889		10,889
Long-term debt, net	$	763,909	$	763,879

Revolving Credit Facility

The Company has a $400,000 senior secured revolving credit facility. The facility includes a provision permitting the Company to increase the size of the facility, up to four times, in increments of at least $25,000 each (up to a maximum of $150,000) under certain circumstances if lenders agree to commit to such an increase. At March 31, 2014, the Company had no borrowings outstanding under the revolving credit facility. Any borrowings under the facility will bear interest at either LIBOR plus a spread ranging from 1.75% to 2.25% or a base rate plus a spread ranging from 0.25% to 0.75%. The revolving credit facility also requires an unused commitment fee of 0.375% per annum. All interest rates under the facility are subject to monthly grid pricing adjustments based on prior month average daily loan availability. The revolving credit facility matures on September 16, 2016. As of March 31, 2014, the Company had outstanding letters of credit totaling $16,921 and borrowing availability of $383,079 under the revolving credit facility.

8. Stock-Based Compensation

Under the Westlake Chemical Corporation 2013 Omnibus Incentive Plan (as amended and restated, the "2013 Plan"), all employees and nonemployee directors of the Company, as well as certain individuals who have agreed to become the Company's employees, are eligible for awards. Shares of common stock may be issued as authorized in the 2013 Plan. At the discretion of the administrator of the 2013 Plan, employees and nonemployee directors may be granted awards in the form of stock options, stock appreciation rights, stock awards, restricted stock units or cash awards (any of which may be a performance award). Total stock-based compensation expense related to the 2013 Plan was $2,222 and $1,499 for the three months ended March 31, 2014 and 2013, respectively.

9. Derivative Instruments

Commodity Risk Management

The Company uses derivative instruments to reduce price volatility risk on raw materials and products as a substantial portion of its raw materials and products are commodities whose prices fluctuate as market supply and demand fundamentals change. Business strategies to protect against such instability include ethylene product feedstock flexibility and moving downstream into the olefins and vinyls products where pricing is more stable. The Company does not use derivative instruments to engage in speculative activities.

For derivative instruments that are designated and qualify as fair value hedges, the gains or losses on the derivative instruments, as well as the offsetting losses or gains on the hedged items attributable to the hedged risk, were included in cost of sales in the consolidated statement of operations for the three months ended March 31, 2013. The Company had no derivative instruments that were designated as fair value hedges for the three months ended March 31, 2014.

Gains and losses from changes in the fair value of derivative instruments that are not designated as hedging instruments were included in gross profit in the consolidated statements of operations for the three months ended March 31, 2014 and 2013.

The exposure on commodity derivatives used for price risk management includes the risk that the counterparty will not pay if the market declines below the established fixed price. In such case, the Company would lose the benefit of the derivative differential on the volume of the commodities covered. In any event, the Company would continue to receive the market price on the actual volume hedged. The Company also bears the risk that it could lose the benefit of market improvements over the

8

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

fixed derivative price for the term and volume of the derivative instruments (as such improvements would accrue to the benefit of the counterparty).

Disclosures related to the Company's derivative assets and derivative liabilities subject to enforceable master netting arrangements have not been presented as they are not material to the Company's consolidated balance sheets at March 31, 2014 and December 31, 2013.

The fair values of derivative instruments in the Company's consolidated balance sheets were as follows:

	Derivative Assets
	Balance Sheet Location	Fair Value as of
		March 31, 2014		December 31, 2013
Not designated as hedging instruments
Commodity forward contracts	Accounts receivable, net	$	248	$	296
Total derivative assets		$	248	$	296

	Derivative Liabilities
	Balance Sheet Location	Fair Value as of
		March 31, 2014		December 31, 2013
Not designated as hedging instruments
Commodity forward contracts	Accrued liabilities	$	54	$	176
Total derivative liabilities		$	54	$	176

The following tables reflect the impact of derivative instruments designated as fair value hedges and the related hedged item on the Company's consolidated statements of operations. For the three months ended March 31, 2013, there was no material ineffectiveness with regard to the Company's qualifying fair value hedges.

Derivatives in Fair Value    Hedging Relationships	Location of Gain (Loss) Recognized in  Income on Derivative	Three Months Ended March 31,
		2014		2013
Commodity forward contracts	Cost of sales	$	—	$	(1,643	)
Hedged Items in Fair Value    Hedging Relationships	Location of Gain (Loss) Recognized in  Income on Hedged Items	Three Months Ended March 31,
		2014		2013
Firm commitment designated as the hedged item	Cost of sales	$	—	$	1,395

The impact of derivative instruments that have not been designated as hedges on the Company's consolidated statements of operations were as follows:

Derivatives Not Designated as    Hedging Instruments	Location of Gain (Loss) Recognized in  Income on Derivative	Three Months Ended March 31,
		2014			2013
Commodity forward contracts	Gross profit	$	(611	)	$	7,335

See Note 10 for the fair value of the Company's derivative instruments.

9

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

10. Fair Value Measurements

The Company reports certain assets and liabilities at fair value, which is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date (exit price). Under the accounting guidance for fair value measurements, inputs used to measure fair value are classified in one of three levels:

Level 1: Quoted market prices in active markets for identical assets or liabilities.

Level 2: Observable market-based inputs or unobservable inputs that are corroborated by market data.

Level 3: Unobservable inputs that are not corroborated by market data.

The following tables summarize, by level within the fair value hierarchy, the Company's assets and liabilities that were accounted for at fair value on a recurring basis:

	March 31, 2014
	Level 1		Level 2			Total
Derivative instruments
Risk management assets - Commodity forward contracts	$	—	$	248		$	248
Risk management liabilities - Commodity forward contracts	—		(54		)	(54		)
Available-for-sale marketable securities	100,603		160,286			260,889
	December 31, 2013
	Level 1		Level 2			Total
Derivative instruments
Risk management assets - Commodity forward contracts	$	48	$	248		$	296
Risk management liabilities - Commodity forward contracts	—		(176		)	(176		)
Available-for-sale marketable securities	91,595		147,793			239,388

The Level 2 measurements for the Company's commodity contracts are derived using forward curves supplied by industry-recognized and unrelated third-party services. The Level 2 measurements for the Company's available-for-sale securities are derived using market-based pricing provided by unrelated third-party services.

There were no transfers in or out of Levels 1 and 2 of the fair value hierarchy for the three months ended March 31, 2014 and 2013.

In addition to the financial assets and liabilities above, the Company has other financial assets and liabilities subject to fair value measures. These financial assets and liabilities include cash and cash equivalents, accounts receivable, net, accounts payable and long-term debt, all of which are recorded at carrying value. The amounts reported in the consolidated balance sheets for cash and cash equivalents, accounts receivable, net and accounts payable approximate their fair value due to the short maturities of these instruments. The carrying and fair values of the Company's long-term debt are summarized in the table below. The Company's long-term debt instruments are publicly-traded. A market approach, based upon quotes from financial reporting services, is used to measure the fair value of the Company's long-term debt. Because the Company's long-term debt instruments may not be actively traded, the inputs used to measure the fair value of the Company's long-term debt are classified as Level 2 inputs within the fair value hierarchy.

	March 31, 2014				December 31, 2013
	Carrying Value		Fair Value		Carrying Value		Fair Value
3.60% senior notes due 2022	$	249,020	$	242,600	$	248,990	$	236,905
6 ½% senior notes due 2029	100,000		113,000		100,000		109,490
6 ¾% senior notes due 2032	250,000		281,775		250,000		265,148
6 ½% GO Zone Senior Notes Due 2035	89,000		101,238		89,000		94,606
6 ½% IKE Zone Senior Notes Due 2035	65,000		73,938		65,000		69,094
Loan related to tax-exempt waste disposal revenue    bonds due 2027	10,889		10,889		10,889		10,889

10

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

11. Income Taxes

The effective income tax rate was 34.5% for the three months ended March 31, 2014. The effective income tax rate for the 2014 period was below the U.S. federal statutory rate of 35.0% primarily due to state tax credits and the domestic manufacturing deduction, mostly offset by state income taxes. The effective income tax rate was 35.5% for the three months ended March 31, 2013. The effective income tax rate for the 2013 period was above the U.S. federal statutory rate of 35.0% primarily due to state income taxes, partially offset by the domestic manufacturing deduction.

There was no material change to the total gross unrecognized tax benefits for the three months ended March 31, 2014. Management anticipates that all of the gross unrecognized tax benefits of $2,501 will be recognized within the next twelve months due to expiring statutes of limitations. The impact from the recognition of these tax benefits on the Company's effective tax rate is expected to be immaterial.

The Company recognizes penalties and interest accrued related to unrecognized tax benefits in income tax expense. As of March 31, 2014, the Company had no material accrued interest and penalties related to uncertain tax positions.

The Company files income tax returns in the U.S. federal jurisdiction, various states and foreign jurisdictions. The Company is no longer subject to examinations by tax authorities before the year 2007.

12. Earnings per Share

The Company has unvested shares of restricted stock and restricted stock units outstanding that are considered participating securities and, therefore, computes basic and diluted earnings per share under the two-class method. Basic earnings per share for the periods are based upon the weighted average number of shares of common stock outstanding during the periods. Diluted earnings per share include the effect of certain stock options.

	Three Months Ended March 31,
	2014			2013
Net income	$	158,032		$	123,347
Less:
Net income attributable to participating securities	(384		)	(568		)
Net income attributable to common shareholders	$	157,648		$	122,779

The following table reconciles the denominator for the basic and diluted earnings per share computations shown in the consolidated statements of operations:

	Three Months Ended March 31,
	2014		2013
Weighted average common shares—basic (1)	133,072,254		133,251,071
Plus incremental shares from:
Assumed exercise of options (1)	540,670		566,666
Weighted average common shares—diluted (1)	133,612,924		133,817,737
Earnings per share: (1)
Basic	$	1.18	$	0.92
Diluted	$	1.18	$	0.92

_____________

(1) Share amounts and per share data for the three months ended March 31, 2013 have been restated to reflect the effect of a two-for-one stock split on March 18, 2014. See Note 1 for additional information.

Excluded from the computation of diluted earnings per share are options to purchase 69,662 and 72,776 shares of common stock for the three months ended March 31, 2014 and 2013, respectively. These options were outstanding during the periods reported but were excluded because the effect of including them would have been antidilutive.

11

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

13. Pension and Post-Retirement Benefit Costs

Components of net periodic benefit cost are as follows:

	Three Months Ended March 31,
	Pension						Post-retirement Healthcare
	2014			2013			2014		2013
Service cost	$	84		$	264		$	5	$	2
Interest cost	595			501			181		147
Expected return on plan assets	(809		)	(714		)	—		—
Amortization of prior service cost	74			74			13		21
Amortization of net loss	63			429			69		90
Net periodic benefit cost	$	7		$	554		$	268	$	260

The Company contributed $388 to the Salaried pension plan in the first three months of 2014, and contributed $290 and $60 to the Wage pension plan in the first three months of 2014 and 2013, respectively. The Company did not contribute to the Salaried pension plan in the first three months of 2013. The Company expects to make additional contributions of $2,389 to the Salaried pension plan and $916 to the Wage pension plan during the fiscal year ending December 31, 2014.

14. Accumulated Other Comprehensive Loss

Changes in accumulated other comprehensive income (loss) by component for the three months ended March 31, 2014 and 2013 were as follows:

	Benefits Liability, Net of Tax			Cumulative Foreign Currency Exchange			Net Unrealized Holding Gains on Investments, Net of Tax		Total
Balances at December 31, 2013	$	(6,696	)	$	3,904		$	176	$	(2,616	)
Other comprehensive (loss) income before    reclassifications	—			(898		)	1,581		683
Amounts reclassified from accumulated other    comprehensive loss	135			—			16		151
Net other comprehensive income (loss) for the period	135			(898		)	1,597		834
Balances at March 31, 2014	$	(6,561	)	$	3,006		$	1,773	$	(1,782	)

	Benefits Liability, Net of Tax			Cumulative Foreign Currency Exchange			Total
Balances at December 31, 2012	$	(16,351	)	$	5,511		$	(10,840	)
Other comprehensive loss before reclassifications	—			(570		)	(570		)
Amounts reclassified from accumulated other comprehensive loss	378			—			378
Net other comprehensive income (loss) for the period	378			(570		)	(192		)
Balances at March 31, 2013	$	(15,973	)	$	4,941		$	(11,032	)

12

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

The following table provides the details of the amounts reclassified from accumulated other comprehensive income (loss) into net income in the consolidated statements of operations for the three months ended March 31, 2014 and 2013:

Details about Accumulated Other Comprehensive    Income (Loss) Components	Location of Reclassification (Income (Expense)) in Consolidated Statements of Operations	Three Months Ended March 31,
		2014			2013
Amortization of pension and other post-retirement items
Prior service costs	(1)	$	(87	)	$	(95	)
Net loss	(1)	(132		)	(519		)
		(219		)	(614		)
	Provision for income taxes	84			236
		(135		)	(378		)
Net unrealized gains on available-for-sale investments
Realized loss on available-for-sale investments	Other income, net	(25		)	—
	Provision for income taxes	9			—
		(16		)	—
Total reclassifications for the period		$	(151	)	$	(378	)

_____________

(1) These accumulated other comprehensive loss components are included in the computation of net periodic benefit cost. For additional information, please read Note 10 (Employee Benefits) to the financial statements included in the 2013 Form 10-K.

15. Commitments and Contingencies

The Company is subject to environmental laws and regulations that can impose civil and criminal sanctions and that may require it to mitigate the effects of contamination caused by the release or disposal of hazardous substances into the environment. Under one law, the U.S. Comprehensive Environmental Response, Compensation, and Liability Act ("CERCLA"), an owner or operator of property may be held strictly liable for remediating contamination without regard to whether that person caused the contamination, and without regard to whether the practices that resulted in the contamination were legal at the time they occurred. Because several of the Company's production sites have a history of industrial use, it is impossible to predict precisely what effect these legal requirements will have on the Company.

Contract Disputes with Goodrich and PolyOne. In connection with the 1990 and 1997 acquisitions of the Goodrich Corporation ("Goodrich") chemical manufacturing complex in Calvert City, Kentucky, Goodrich agreed to indemnify the Company for any liabilities related to preexisting contamination at the complex. For its part, the Company agreed to indemnify Goodrich for post-closing contamination caused by the Company's operations. The soil and groundwater at the complex, which does not include the Company's nearby polyvinyl chloride ("PVC") facility, had been extensively contaminated under Goodrich's operations. In 1993, Goodrich spun off the predecessor of PolyOne Corporation ("PolyOne"), and that predecessor assumed Goodrich's indemnification obligations relating to preexisting contamination.

In 2003, litigation arose among the Company, Goodrich and PolyOne with respect to the allocation of the cost of remediating contamination at the site. The parties settled this litigation in December 2007 and the case was dismissed. In the settlement the parties agreed that, among other things: (1) PolyOne would pay 100% of the costs (with specified exceptions), net of recoveries or credits from third parties, incurred with respect to environmental issues at the Calvert City site from August 1, 2007 forward; (2) either the Company or PolyOne might, from time to time in the future (but not more than once every five years), institute an arbitration proceeding to adjust that percentage; and (3) the Company and PolyOne would negotiate a new environmental remediation utilities and services agreement to cover the Company's provision to, or on behalf of, PolyOne of certain environmental remediation services at the site. The current environmental remediation activities at the Calvert City complex do not have a specified termination date but are expected to last for the foreseeable future. The costs incurred by the Company that have been invoiced to PolyOne to provide the environmental remediation services were $3,284 in 2013. By letter dated March 16, 2010, PolyOne notified the Company that it was initiating an arbitration proceeding under the settlement agreement. In this proceeding, PolyOne seeks to readjust the percentage allocation of costs and to recover approximately $1,400 from the Company in reimbursement of previously paid remediation costs. The arbitration is currently stayed.

13

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

State Administrative Proceedings. There are several administrative proceedings in Kentucky involving the Company, Goodrich and PolyOne related to the same manufacturing complex in Calvert City. In 2003, the Kentucky Environmental and Public Protection Cabinet (the "Cabinet") re-issued Goodrich's Resource Conservation and Recovery Act ("RCRA") permit which requires Goodrich to remediate contamination at the Calvert City manufacturing complex. Both Goodrich and PolyOne challenged various terms of the permit in an attempt to shift Goodrich's clean-up obligations under the permit to the Company. The Company intervened in the proceedings. The Cabinet has suspended all corrective action under the RCRA permit in deference to a remedial investigation and feasibility study ("RIFS") being conducted, under the auspices of the U.S. Environmental Protection Agency ("EPA"), pursuant to an Administrative Settlement Agreement ("AOC"), which became effective on December 9, 2009. See "Federal Administrative Proceedings" below. The proceedings have been postponed. Periodic status conferences will be held to evaluate whether additional proceedings will be required.

Federal Administrative Proceedings. In May 2009, the Cabinet sent a letter to the EPA requesting the EPA's assistance in addressing contamination at the Calvert City site under CERCLA. In its response to the Cabinet also in May 2009, the EPA stated that it concurred with the Cabinet's request and would incorporate work previously conducted under the Cabinet's RCRA authority into the EPA's cleanup efforts under CERCLA. Since 1983, the EPA has been addressing contamination at an abandoned landfill adjacent to the Company's plant which had been operated by Goodrich and which was being remediated pursuant to CERCLA. During the past three years, the EPA has directed Goodrich and PolyOne to conduct additional investigation activities at the landfill and at the Company's plant. In June 2009, the EPA notified the Company that the Company may have potential liability under section 107(a) of CERCLA at its plant site. Liability under section 107(a) of CERCLA is strict and joint and several. The EPA also identified Goodrich and PolyOne, among others, as potentially responsible parties at the plant site. The Company negotiated, in conjunction with the other potentially responsible parties, the AOC and an order to conduct the RIFS. On July 12, 2013, the parties submitted separate draft RIFS reports to the EPA. The EPA has hired a contractor to complete the remedial investigation report.

Monetary Relief. Except as noted above with respect to the settlement of the contract litigation among the Company, Goodrich and PolyOne, none of the court, the Cabinet nor the EPA has established any allocation of the costs of remediation among the various parties that are involved in the judicial and administrative proceedings discussed above. At this time, the Company is not able to estimate the loss or reasonable possible loss, if any, on the Company's financial statements that could result from the resolution of these proceedings. Any cash expenditures that the Company might incur in the future with respect to the remediation of contamination at the complex would likely be spread out over an extended period. As a result, the Company believes it is unlikely that any remediation costs allocable to it will be material in terms of expenditures made in any individual reporting period.

In addition to the matters described above, the Company is involved in various routine legal proceedings incidental to the conduct of its business. The Company does not believe that any of these routine legal proceedings will have a material adverse effect on its financial condition, results of operations or cash flows.

14

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

16. Segment Information

The Company operates in two principal operating segments: Olefins and Vinyls. These segments are strategic business units that offer a variety of different products. The Company manages each segment separately as each business requires different technology and marketing strategies.

	Three Months Ended March 31,
	2014			2013
Net external sales
Olefins
Polyethylene	$	487,144		$	420,768
Styrene, feedstock and other	235,654			162,077
Total Olefins	722,798			582,845
Vinyls
PVC, caustic soda and other	190,527			195,246
Building products	114,351			86,556
Total Vinyls	304,878			281,802
	$	1,027,676		$	864,647
Intersegment sales
Olefins	$	56,853		$	70,283
Vinyls	343			264
	$	57,196		$	70,547
Income (loss) from operations
Olefins	$	272,333		$	161,058
Vinyls	(21,114		)	43,663
Corporate and other	(3,164		)	(10,666		)
	$	248,055		$	194,055
Depreciation and amortization
Olefins	$	26,647		$	23,346
Vinyls	19,168			11,884
Corporate and other	157			126
	$	45,972		$	35,356
Other income (expense), net
Olefins	$	1,454		$	4,010
Vinyls	(34		)	(425		)
Corporate and other	1,089			(66		)
	$	2,509		$	3,519
Provision for (benefit from) income taxes
Olefins	$	93,550		$	55,477
Vinyls	(10,070		)	13,720
Corporate and other	(105		)	(1,251		)
	$	83,375		$	67,946

15

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

	Three Months Ended March 31,
	2014		2013
Capital expenditures
Olefins	$	29,074	$	50,040
Vinyls	81,120		100,317
Corporate and other	547		427
	$	110,741	$	150,784

A reconciliation of total segment income from operations to consolidated income before income taxes is as follows:

	Three Months Ended March 31,
	2014			2013
Income from operations	$	248,055		$	194,055
Interest expense	(9,157		)	(6,281		)
Other income, net	2,509			3,519
Income before income taxes	$	241,407		$	191,293

	March 31, 2014		December 31, 2013
Total assets
Olefins	$	1,556,856	$	1,557,510
Vinyls	1,768,572		1,740,595
Corporate and other	846,528		762,804
	$	4,171,956	$	4,060,909

17. Subsequent Events

Subsequent events were evaluated through the date on which the financial statements were issued.

16

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

18. Guarantor Disclosures

The Company's payment obligations under the 3.60% senior notes due 2022 are fully and unconditionally guaranteed by each of its current and future domestic subsidiaries that guarantee other debt of the Company or of another guarantor of the 3.60% senior notes due 2022 in excess of $5,000 (the "Guarantor Subsidiaries"). Each Guarantor Subsidiary is 100% owned by Westlake Chemical Corporation. These guarantees are the joint and several obligations of the Guarantor Subsidiaries. The following unaudited condensed consolidating financial information presents the financial condition, results of operations and cash flows of Westlake Chemical Corporation, the Guarantor Subsidiaries and the remaining subsidiaries that do not guarantee the 3.60% senior notes due 2022 (the "Non-Guarantor Subsidiaries"), together with consolidating eliminations necessary to present the Company's results on a consolidated basis.

Condensed Consolidating Financial Information as of March 31, 2014

	Westlake Chemical Corporation		Guarantor Subsidiaries		Non- Guarantor Subsidiaries		Eliminations			Consolidated
Balance Sheet
Current assets
Cash and cash equivalents	$	490,508	$	7,896	$	34,239	$	—		$	532,643
Marketable securities	243,694		—		—		—			243,694
Accounts receivable, net	58,050		888,829		3,381		(528,381		)	421,879
Inventories	—		422,166		16,843		—			439,009
Prepaid expenses and other    current assets	889		12,864		2,127		—			15,880
Deferred income taxes	441		33,422		295		—			34,158
Total current assets	793,582		1,365,177		56,885		(528,381		)	1,687,263
Property, plant and equipment, net	—		2,144,266		6,377		—			2,150,643
Equity investments	2,975,949		101,472		31,056		(3,040,917		)	67,560
Other assets, net	31,493		238,867		1,176		(5,046		)	266,490
Total assets	$	3,801,024	$	3,849,782	$	95,494	$	(3,574,344	)	$	4,171,956
Current liabilities
Accounts payable	$	463,650	$	193,020	$	14,351	$	(459,069	)	$	211,952
Accrued liabilities	15,782		200,781		731		(69,312		)	147,982
Total current liabilities	479,432		393,801		15,082		(528,381		)	359,934
Long-term debt	753,020		10,889		—		—			763,909
Deferred income taxes	—		451,597		652		(5,046		)	447,203
Other liabilities	—		32,308		30		—			32,338
Stockholders' equity	2,568,572		2,961,187		79,730		(3,040,917		)	2,568,572
Total liabilities and stockholders' equity	$	3,801,024	$	3,849,782	$	95,494	$	(3,574,344	)	$	4,171,956

17

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

Condensed Consolidating Financial Information as of December 31, 2013

	Westlake Chemical Corporation		Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Eliminations			Consolidated
Balance Sheet
Current assets
Cash and cash equivalents	$	420,948	$	6,227	$	34,126	$	—		$	461,301
Marketable securities	239,388		—		—		—			239,388
Accounts receivable, net	3,879		738,156		2,755		(316,333		)	428,457
Inventories	—		456,306		15,573		—			471,879
Prepaid expenses and other    current assets	778		11,312		1,798		—			13,888
Deferred income taxes	441		33,422		306		—			34,169
Total current assets	665,434		1,245,423		54,558		(316,333		)	1,649,082
Property, plant and equipment, net	—		2,081,091		6,923		—			2,088,014
Equity investments	2,815,752		100,326		31,518		(2,880,721		)	66,875
Other assets, net	15,393		246,125		1,199		(5,779		)	256,938
Total assets	$	3,496,579	$	3,672,965	$	94,198	$	(3,202,833	)	$	4,060,909
Current liabilities
Accounts payable	$	316,652	$	223,134	$	10,649	$	(300,822	)	$	249,613
Accrued liabilities	8,334		161,140		1,282		(15,511		)	155,245
Total current liabilities	324,986		384,274		11,931		(316,333		)	404,858
Long-term debt	752,990		10,889		—		—			763,879
Deferred income taxes	—		443,026		729		(5,779		)	437,976
Other liabilities	—		35,533		60		—			35,593
Stockholders' equity	2,418,603		2,799,243		81,478		(2,880,721		)	2,418,603
Total liabilities and stockholders' equity	$	3,496,579	$	3,672,965	$	94,198	$	(3,202,833	)	$	4,060,909

18

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

Condensed Consolidating Financial Information for the Three Months Ended March 31, 2014

	Westlake Chemical Corporation			Guarantor Subsidiaries			Non- Guarantor Subsidiaries			Eliminations			Consolidated
Statement of Operations
Net sales	$	—		$	1,020,429		$	9,117		$	(1,870	)	$	1,027,676
Cost of sales	—			734,350			8,186			(1,870		)	740,666
Gross profit	—			286,079			931			—			287,010
Selling, general and administrative    expenses	546			37,063			1,346			—			38,955
(Loss) income from operations	(546		)	249,016			(415		)	—			248,055
Interest expense	(8,947		)	(210		)	—			—			(9,157		)
Other income (expense), net	5,006			(1,883		)	(614		)	—			2,509
(Loss) income before income taxes	(4,487		)	246,923			(1,029		)	—			241,407
(Benefit from) provision for income taxes	(1,558		)	85,110			(177		)	—			83,375
Equity in net income of subsidiaries	160,961			—			—			(160,961		)	—
Net income (loss)	$	158,032		$	161,813		$	(852	)	$	(160,961	)	$	158,032
Comprehensive income (loss)	$	158,866		$	161,948		$	(1,750	)	$	(160,198	)	$	158,866

Condensed Consolidating Financial Information for the Three Months Ended March 31, 2013

	Westlake Chemical Corporation			Guarantor Subsidiaries			Non- Guarantor Subsidiaries			Eliminations			Consolidated
Statement of Operations
Net sales	$	—		$	856,085		$	10,540		$	(1,978	)	$	864,647
Cost of sales	—			629,286			9,530			(1,978		)	636,838
Gross profit	—			226,799			1,010			—			227,809
Selling, general and administrative    expenses	510			31,709			1,535			—			33,754
(Loss) income from operations	(510		)	195,090			(525		)	—			194,055
Interest expense	(6,258		)	(23		)	—			—			(6,281		)
Other income (expense), net	4,309			(290		)	(500		)	—			3,519
(Loss) income before income taxes	(2,459		)	194,777			(1,025		)	—			191,293
(Benefit from) provision for income taxes	(874		)	69,051			(231		)	—			67,946
Equity in net income of subsidiaries	124,932			—			—			(124,932		)	—
Net income (loss)	$	123,347		$	125,726		$	(794	)	$	(124,932	)	$	123,347
Comprehensive income (loss)	$	123,155		$	126,104		$	(1,364	)	$	(124,740	)	$	123,155

19

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

Condensed Consolidating Financial Information for the Three Months Ended March 31, 2014

	Westlake Chemical Corporation			Guarantor Subsidiaries			Non- Guarantor Subsidiaries			Eliminations			Consolidated
Statement of Cash Flows
Cash flows from operating activities
Net income (loss)	$	158,032		$	161,813		$	(852	)	$	(160,961	)	$	158,032
Adjustments to reconcile net income    (loss) to net cash (used for) provided    by operating activities
Depreciation and amortization	365			45,408			564			—			46,337
Deferred income taxes	(162		)	8,487			(50		)	—			8,275
Net changes in working capital    and other	(165,553		)	6,263			(1,810		)	160,961			(139		)
Net cash (used for) provided by    operating activities	(7,318		)	221,971			(2,148		)	—			212,505
Cash flows from investing activities
Additions to property, plant and    equipment	—			(110,559		)	(182		)	—			(110,741		)
Proceeds from disposition of assets	—			12			—			—			12
Proceeds from sales and maturities of    securities	30,119			—			—			—			30,119
Purchase of securities	(49,025		)	—			—			—			(49,025		)
Settlements of derivative instruments	—			(409		)	—			—			(409		)
Net cash used for investing    activities	(18,906		)	(110,956		)	(182		)	—			(130,044		)
Cash flows from financing activities
Intercompany financing	106,903			(109,346		)	2,443			—			—
Dividends paid	(16,789		)	—			—			—			(16,789		)
Proceeds from exercise of stock options	2,158			—			—			—			2,158
Windfall tax benefits from share-based    payment arrangements	3,512			—			—			—			3,512
Net cash provided by (used for)    financing activities	95,784			(109,346		)	2,443			—			(11,119		)
Net increase in cash and cash equivalents	69,560			1,669			113			—			71,342
Cash and cash equivalents at beginning    of period	420,948			6,227			34,126			—			461,301
Cash and cash equivalents at end of period	$	490,508		$	7,896		$	34,239		$	—		$	532,643

20

WESTLAKE CHEMICAL CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - Continued

(Unaudited)

(in thousands of dollars, except share amounts and per share data)

Condensed Consolidating Financial Information for the Three Months Ended March 31, 2013

	Westlake Chemical Corporation			Guarantor Subsidiaries			Non- Guarantor Subsidiaries			Eliminations			Consolidated
Statement of Cash Flows
Cash flows from operating activities
Net income (loss)	$	123,347		$	125,726		$	(794	)	$	(124,932	)	$	123,347
Adjustments to reconcile net income    (loss) to net cash (used for) provided    by operating activities
Depreciation and amortization	365			34,766			590			—			35,721
Deferred income taxes	(23		)	29,896			(407		)	—			29,466
Net changes in working capital    and other	(129,403		)	(68,474		)	663			124,932			(72,282		)
Net cash (used for) provided by    operating activities	(5,714		)	121,914			52			—			116,252
Cash flows from investing activities
Additions to property, plant and    equipment	—			(149,113		)	(1,671		)	—			(150,784		)
Proceeds from disposition of assets	—			—			2			—			2
Proceeds from repayment of loan    to affiliate	—			—			167			—			167
Proceeds from sales and maturities of    securities	124,873			—			—			—			124,873
Purchase of securities	(94,903		)	—			—			—			(94,903		)
Settlements of derivative instruments	—			(679		)	—			—			(679		)
Net cash provided by (used for)    investing activities	29,970			(149,792		)	(1,502		)	—			(121,324		)
Cash flows from financing activities
Intercompany financing	(28,120		)	28,553			(433		)	—			—
Dividends paid	(12,553		)	—			—			—			(12,553		)
Proceeds from exercise of stock options	1,590			—			—			—			1,590
Windfall tax benefits from share-based    payment arrangements	3,844			—			—			—			3,844
Net cash (used for) provided by    financing activities	(35,239		)	28,553			(433		)	—			(7,119		)
Net (decrease) increase in cash and    cash equivalents	(10,983		)	675			(1,883		)	—			(12,191		)
Cash and cash equivalents at beginning    of period	753,881			6,973			29,224			—			790,078
Cash and cash equivalents at end of period	$	742,898		$	7,648		$	27,341		$	—		$	777,887

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Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operations

This discussion and analysis should be read in conjunction with information contained in the accompanying unaudited consolidated interim financial statements of Westlake Chemical Corporation and the notes thereto and the consolidated financial statements and notes thereto of Westlake Chemical Corporation included in Westlake Chemical Corporation's Annual Report on Form 10-K for the fiscal year ended December 31, 2013 (the "2013 Form 10-K"). The following discussion contains forward-looking statements. Please read "Forward-Looking Statements" for a discussion of limitations inherent in such statements.

We are a vertically integrated manufacturer and marketer of basic chemicals, vinyls, polymers and fabricated building products. Our two principal operating segments are Olefins and Vinyls. We use the majority of our internally-produced basic chemicals to produce higher value-added chemicals and building products.

Since 2009 and continuing through the first quarter of 2014, a cost advantage for ethane-based ethylene producers over naphtha-based ethylene producers has allowed a strong export market for ethylene derivatives and higher margins for North American chemical producers, including Westlake. Increased global demand for polyethylene in recent years in particular has resulted in improved operating margins and cash flow for our Olefins segment.

Continued slow recovery in the U.S. construction markets and budgetary constraints in municipal spending have contributed to lower domestic demand for our vinyls products. However, since late 2010, the polyvinyl chloride ("PVC") industry has experienced an increase in PVC resin export demand, driven largely by more competitive feedstock and energy cost positions in North America. As a consequence, domestic PVC resin industry operating rates have improved since 2010, largely due to higher PVC resin export shipments. In the fourth quarter of 2013, we started up our new world scale Geismar, Louisiana chlor-alkali plant. In April 2014, we completed the expansion and conversion of our Calvert City, Kentucky ethylene plant to ethane feedstock (see further discussion in "Recent Developments" below). The completion of these two projects is expected to improve the profitability of our Vinyls segment.

The U.S. and global economic environment appears to be slowly improving, but depending on the performance of both economies in the remainder of 2014 and beyond, could still have a negative effect on our financial condition, results of operations or cash flows.

Recent Developments

In April 2014, we completed the previously announced feedstock conversion and ethylene expansion project at our Calvert City ethylene plant. With the completion of this project, our Calvert City ethylene plant now utilizes cost-advantaged ethane feedstock and increased its capacity by approximately 180 million pounds annually. This expansion and feedstock conversion project is expected to enhance our vinyl chain integration and leverage low cost ethane being developed in the Marcellus shale area. The ethylene plant and other production facilities at our Calvert City complex were shut down for approximately 19 days (14 days during the first quarter of 2014) as a result of the feedstock conversion and ethylene expansion project and other planned maintenance turnaround activities. Income from operations for the first quarter of 2014 was negatively impacted by the lost sales, lower production rates, unabsorbed fixed manufacturing costs and other costs associated with the feedstock conversion and ethylene expansion project and maintenance turnaround at the Calvert City complex.

On February 14, 2014, our Board of Directors authorized a two-for-one split of our common stock. Stockholders of record as of February 28, 2014 were entitled to one additional share for every share outstanding, which was distributed on March 18, 2014. The total number of authorized common stock shares and associated par value were unchanged by this stock split.

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Results of Operations

	Three Months Ended March 31,
	2014			2013
	(dollars in thousands, except per share data)
Net external sales
Olefins
Polyethylene	$	487,144		$	420,768
Styrene, feedstock and other	235,654			162,077
Total Olefins	722,798			582,845
Vinyls
PVC, caustic soda and other	190,527			195,246
Building products	114,351			86,556
Total Vinyls	304,878			281,802
Total	$	1,027,676		$	864,647
Income (loss) from operations
Olefins	$	272,333		$	161,058
Vinyls	(21,114		)	43,663
Corporate and other	(3,164		)	(10,666		)
Total income from operations	248,055			194,055
Interest expense	(9,157		)	(6,281		)
Other income, net	2,509			3,519
Provision for income taxes	83,375			67,946
Net income	$	158,032		$	123,347
Diluted earnings per share (1)	$	1.18		$	0.92
_____________
(1) Per share data for the three months ended March 31, 2013 has been restated to reflect the effect of a two-for-one           stock split on March 18, 2014. See Note 1 to the unaudited consolidated financial statements within this Quarterly           Report on Form 10-Q for additional information.
	Three Months Ended March 31, 2014
	Average Sales Price			Volume
Product sales price and volume percentage change from prior year period
Olefins	+13.3		%	+10.7		%
Vinyls	+1.7		%	+4.9		%
Company average	+9.5		%	+8.8		%
	Three Months Ended March 31,
	2014			2013
Average industry prices (1)
Ethane (cents/lb)	11.4			8.7
Propane (cents/lb)	30.8			20.5
Ethylene (cents/lb) (2)	55.1			63.3
Polyethylene (cents/lb) (3)	107.7			97.3
Styrene (cents/lb) (4)	86.9			85.9
Caustic soda ($/short ton) (5)	579.2			602.5
Chlorine ($/short ton) (6)	236.7			255.0
PVC (cents/lb) (7)	66.5			59.2

_____________

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(1) Industry pricing data was obtained from IHS Chemical. We have not independently verified the data.

(2) Represents average North American spot prices of ethylene over the period as reported by IHS Chemical.

(3) Represents average North American contract prices of polyethylene low density film over the period as reported by IHS Chemical.

(4) Represents average North American contract prices of styrene over the period as reported by IHS Chemical.

(5) Represents average North American undiscounted contract prices of caustic soda over the period as reported by IHS Chemical.

(6) Represents average North American contract prices of chlorine (into chemicals) over the period as reported by IHS Chemical.

(7) Represents average North American contract prices of PVC over the period as reported by IHS Chemical.

Summary

For the quarter ended March 31, 2014, net income was $158.0 million, or $1.18 per diluted share, on net sales of $1,027.7 million. This represents an increase in net income of $34.7 million, or $0.26 per diluted share, compared to the quarter ended March 31, 2013 net income of $123.3 million, or $0.92 per diluted share, on net sales of $864.6 million. Net sales for the first quarter of 2014 increased by $163.1 million compared to net sales for the first quarter of 2013, mainly attributable to higher sales volumes for polyethylene and ethylene, higher sales prices for most of our major products and sales contributed by our specialty PVC pipe business, which we acquired in May 2013. Income from operations was $248.1 million for the first quarter of 2014 as compared to $194.1 million for the first quarter of 2013. Income from operations for the first quarter of 2014 benefited primarily from higher olefins volumes and improved olefins integrated product margins, as higher sales prices more than offset the increase in feedstock and energy costs. The increase in first quarter 2014 income from operations as compared to the first quarter of 2013 was partially offset by the lost sales, lower production rates, unabsorbed fixed manufacturing costs and other costs associated with the maintenance turnaround at our Calvert City complex and our Calvert City ethylene plant’s feedstock conversion and expansion project.

RESULTS OF OPERATIONS

First Quarter 2014 Compared with First Quarter 2013

Net Sales. Net sales increased by $163.1 million, or 18.9%, to $1,027.7 million in the first quarter of 2014 from $864.6 million in the first quarter of 2013, primarily attributable to higher sales volumes for polyethylene and ethylene, higher sales prices for most of our major products and sales contributed by our specialty PVC pipe business. Average sales prices for the first quarter of 2014 increased by 9.5% as compared to the first quarter of 2013. Overall sales volumes increased by 8.8% as compared to the first quarter of 2013.

Gross Profit. Gross profit margin percentage increased to 27.9% for the first quarter of 2014 from 26.3% for the first quarter of 2013, driven mainly by improved olefins integrated product margins as an increase in sales prices outpaced increases in feedstock and energy costs. Our raw material cost in both segments normally tracks industry prices, which experienced an increase of 31.0% for ethane and an increase of 50.2% for propane, as compared to the first quarter of 2013. Sales prices increased an average of 9.5% for the first quarter of 2014 as compared to the first quarter of 2013. In addition, our margins benefited from the increased ethylene production at our Lake Charles, Louisiana complex after the first quarter 2013 completion of the Petro 2 ethylene unit expansion and its conversion to 100% ethane feedstock capability. Income from operations for the first quarter of 2014 was negatively impacted by the lost sales, lower production rates, unabsorbed fixed manufacturing costs and other costs associated with the maintenance turnaround at our Calvert City complex and our Calvert City ethylene plant’s feedstock conversion and expansion project.

Selling, General and Administrative Expenses. Selling, general and administrative expenses for the first quarter of 2014 of $39.0 million increased by $5.2 million as compared to the first quarter of 2013, mainly due to an increase in payroll and related labor costs, including incentive compensation.

Interest Expense. Interest expense increased by $2.9 million to $9.2 million in the first quarter of 2014 from $6.3 million in the first quarter of 2013 largely as a result of decreased capitalized interest on major capital projects as compared to the prior year period. Debt balances remained relatively unchanged from the prior year period.

Other Income, Net. Other income, net for the first quarter of 2014 of $2.5 million was mainly comprised of income from our equity method investments. Other income, net for the first quarter of 2013 of $3.5 million included a settlement of a claim, which did not recur in the first quarter of 2014.

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Income Taxes. The effective income tax rate was 34.5% for the first quarter of 2014. The effective income tax rate for the first quarter of 2014 was below the U.S. federal statutory rate of 35.0% primarily due to state tax credits and the domestic manufacturing deduction, mostly offset by state income taxes. The effective income tax rate was 35.5% for the first quarter of 2013. The effective income tax rate for the first quarter of 2013 was above the U.S. federal statutory rate of 35.0% primarily due to state income taxes, partially offset by the domestic manufacturing deduction.

Olefins Segment

Net Sales. Net sales increased by $140.0 million, or 24.0%, to $722.8 million in the first quarter of 2014 from $582.8 million in the first quarter of 2013, predominantly due to higher sales prices for most of our major products and higher sales volumes for polyethylene and ethylene as compared to the prior year period. Olefins sales volumes for the first quarter of 2013 were lower primarily due to the turnaround and expansion of the Lake Charles ethylene unit. Average sales prices for the Olefins segment increased by 13.3% in the first quarter of 2014 as compared to the first quarter of 2013. Average sales volumes for the Olefins segment increased by 10.7% in the first quarter of 2014 as compared to the first quarter of 2013.

Income from Operations. Income from operations increased by $111.2 million, or 69.0%, to $272.3 million in the first quarter of 2014 from $161.1 million in the first quarter of 2013. This increase was mainly attributable to higher olefins integrated product margins in the first quarter of 2014 as compared to the prior year period, as the increase in sales prices outpaced increases in feedstock and energy costs. In addition, first quarter 2014 income from operations benefited from higher polyethylene and ethylene sales volumes and improved production rates for most of our major products as compared to the first quarter of 2013. Trading activity in the first quarter of 2014 resulted in a loss of $0.6 million as compared to a gain of $7.3 million in the first quarter of 2013. Income from operations in the first quarter of 2013 was negatively impacted as a result of the lost production, unabsorbed fixed manufacturing costs and other costs associated with the turnaround and expansion of the Lake Charles Petro 2 ethylene unit.

Vinyls Segment

Net Sales. Net sales increased by $23.1 million, or 8.2%, to $304.9 million in the first quarter of 2014 from $281.8 million in the first quarter of 2013. This increase was mainly attributable to the sales contributed by our specialty PVC pipe business, partially offset by lower ethylene co-product sales volume due to the planned shut down of our Calvert City ethylene plant as a result of the feedstock conversion and expansion project. Average sales prices for the Vinyls segment increased by 1.7% in the first quarter of 2014 as compared to the first quarter of 2013. Average sales volumes for the Vinyls segment increased by 4.9% in the first quarter of 2014 as compared to the first quarter of 2013.

Loss/Income from Operations. The Vinyls segment incurred a loss from operations of $21.1 million in the first quarter of 2014 as compared to income from operations of $43.7 million in the first quarter of 2013, a negative change of $64.8 million. This decrease was primarily driven by the lost sales, lower production rates and the expensing of $16.9 million related to unabsorbed fixed manufacturing costs and other costs associated with the maintenance turnaround at our Calvert City complex and our Calvert City ethylene plant’s feedstock conversion and expansion project. In addition, the Vinyls segment's first quarter 2014 operating results were negatively impacted by the severe winter weather and significantly higher propane costs, as average industry prices for propane increased by 50.2% as compared to the prior year period.

CASH FLOW DISCUSSION FOR THE THREE MONTHS ENDED MARCH 31, 2014 AND 2013

Cash Flows

Operating Activities

Operating activities provided cash of $212.5 million in the first three months of 2014 compared to cash provided of $116.3 million in the first three months of 2013. The $96.2 million increase in cash flows from operating activities was mainly due to an increase in income from operations and a decrease in the use of cash for working capital purposes. Income from operations increased by $54.0 million in the first three months of 2014 primarily as a result of higher olefins integrated product margins as compared to the prior year period. Cash flows from operating activities for the first three months of 2013 was negatively impacted by deferred turnaround costs from the turnaround of one of our Lake Charles ethylene units. Changes in components of working capital, which we define for purposes of this cash flow discussion as accounts receivable, net, inventories, prepaid expenses and other current assets, less accounts payable and accrued liabilities, provided cash of $2.0 million in the first three months of 2014, compared to $18.8 million of cash used in the first three months of 2013, a favorable change of $20.8 million. The change was mainly due to a decrease in inventory during the 2014 period.

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Investing Activities

Net cash used for investing activities during the first three months of 2014 was $130.0 million as compared to net cash used for investing activities of $121.3 million in the first three months of 2013. Capital expenditures were $110.7 million in the first three months of 2014 compared to $150.8 million in the first three months of 2013, a decrease mainly attributable to the completion of the new chlor-alkali plant at our Geismar facility in December 2013. Capital expenditures in the first three months of 2014 were mainly incurred on the feedstock conversion and ethylene expansion project and PVC plant expansion project at our Calvert City complex and the planned upgrade and expansion of the second ethylene unit at our Lake Charles complex. Capital expenditures in the first three months of 2013 were mainly incurred on the construction of the new Geismar chlor-alkali plant, the expansion of the first ethylene unit at our Lake Charles complex and the feedstock conversion and ethylene furnaces modernization projects at our Calvert City complex. The remaining capital expenditures in the first three months of 2014 and 2013 primarily related to projects to improve production capacity or reduce costs, maintenance and safety projects and environmental projects at our various facilities. Purchases of securities in the first three months of 2014 totaled $49.0 million and were comprised of corporate and U.S. government debt securities and equity securities. We also received aggregate proceeds of $30.1 million from the sales and maturities of our investments in the first three months of 2014. The activity during the first three months of 2013 was primarily related to the purchases of, and the receipt of proceeds from the maturities of, short-term commercial paper.

Financing Activities

Net cash used for financing activities during the first three months of 2014 was $11.1 million as compared to net cash used of $7.1 million in the first three months of 2013. The activity during the first three months of 2014 was primarily related to the $16.8 million payment of cash dividends, partially offset by proceeds of $2.2 million from the exercise of stock options. The activity during the first three months of 2013 was mainly related to the $12.6 million payment of cash dividends, partially offset by proceeds from the exercise of stock options.

LIQUIDITY AND CAPITAL RESOURCES

Liquidity and Financing Arrangements

Our principal sources of liquidity are from cash and cash equivalents, investments in current marketable securities, cash from operations, short-term borrowings under our revolving credit facility and our long-term financing.

In April 2011, we announced an expansion program to increase the ethane-based ethylene capacity of both of the ethylene units at our Lake Charles complex. We completed the expansion of the first ethylene unit in the first quarter of 2013. We currently plan to upgrade and expand the capacity of the other ethylene unit at our Lake Charles complex in the late 2015 to early 2016 time frame. This project is currently estimated to cost in the range of $250.0 million to $310.0 million and will add approximately 250 million pounds of ethylene capacity. The additional capacity from this expansion is expected to provide ethylene for existing internal uses and may also be sold in the merchant market. This capital project is expected to be funded with cash on hand, cash flow from operations, and, if necessary, borrowings under our revolving credit facility and other external financing. We have incurred minimal cost on this project as of March 31, 2014.

In August 2011, our Board of Directors authorized a stock repurchase program totaling $100.0 million. As of March 31, 2014, we had repurchased 1,252,922 shares of our common stock (on a post-split basis) for an aggregate purchase price of approximately $46.2 million under this program. We did not repurchase any shares under this program during the three months ended March 31, 2014. Purchases under this program may be made either through the open market or in privately negotiated transactions. Decisions regarding the amount and the timing of purchases under the program will be influenced by our cash on hand, our cash flow from operations, general market conditions and other factors. The program may be discontinued by our Board of Directors at any time.

We believe that our sources of liquidity as described above will be adequate to fund our normal operations and ongoing capital expenditures. Funding of any potential large expansions or any potential acquisitions may depend on our ability to obtain additional financing in the future. We may not be able to access additional liquidity at cost effective interest rates due to the volatility of the commercial credit markets.

Cash, Cash Equivalents and Current Marketable Securities

As of March 31, 2014, our cash, cash equivalents and current marketable securities totaled $776.3 million. In addition, we have a revolving credit facility available to supplement cash if needed, as described under "Debt" below.

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Debt

As of March 31, 2014, our long-term debt, including current maturities, totaled $763.9 million, consisting of $250.0 million principal amount of 3.60% senior notes due 2022 (less the unamortized discount of $1.0 million), $100.0 million of 6 ½% senior notes due 2029, $250.0 million of 6 ¾% senior notes due 2032, $89.0 million of 6 ½% senior notes due 2035 (the "6 ½% GO Zone Senior Notes Due 2035"), $65.0 million of 6 ½% senior notes due 2035 (the "6 ½% IKE Zone Senior Notes Due 2035") (collectively, but excluding the 3.60% senior notes due 2022, the "Senior Notes") and a $10.9 million loan from the proceeds of tax-exempt waste disposal revenue bonds (supported by an $11.3 million letter of credit). The 6 ½% senior notes due 2029, the 6 ¾% senior notes due 2032, the 6 ½% GO Zone Senior Notes Due 2035 and the 6 ½% IKE Zone Senior Notes Due 2035 evidence and secure our obligations to the Louisiana Local Government Environmental Facility and Development Authority (the "Authority"), a political subdivision of the State of Louisiana, under four loan agreements relating to the issuance of $100.0 million, $250.0 million, $89.0 million and $65.0 million aggregate principal amount of the Authority's tax-exempt revenue bonds, respectively. As of March 31, 2014, debt outstanding under the tax-exempt waste disposal revenue bonds bore interest at a variable rate. As of March 31, 2014, we were in compliance with all of the covenants with respect to the 3.60% senior notes due 2022, the Senior Notes, our waste disposal revenue bonds and our revolving credit facility.

Our ability to make payments on our indebtedness and to fund planned capital expenditures will depend on our ability to generate cash in the future, which is subject to general economic, financial, competitive, legislative, regulatory and other factors that are beyond our control. Based on our current level of operations, we believe our cash flow from operations, available cash and available borrowings under our revolving credit facility will be adequate to meet our normal operating needs for the foreseeable future.

Revolving Credit Facility

We have a $400.0 million senior secured revolving credit facility. The facility includes a provision permitting us to increase the size of the facility, up to four times, in increments of at least $25.0 million each (up to a maximum of $150.0 million) under certain circumstances if certain lenders agree to commit to such an increase.

At March 31, 2014, we had no borrowings outstanding under the revolving credit facility. Any borrowings under the facility will bear interest at either LIBOR plus a spread ranging from 1.75% to 2.25% or a base rate plus a spread ranging from 0.25% to 0.75%. The revolving credit facility also requires an unused commitment fee of 0.375% per annum. All interest rates under the facility are subject to monthly grid pricing adjustments based on prior month average daily loan availability. The revolving credit facility matures on September 16, 2016. As of March 31, 2014, we had outstanding letters of credit totaling $16.9 million and borrowing availability of $383.1 million under the revolving credit facility.

Our revolving credit facility requires us to maintain a minimum fixed charge coverage ratio of 1.0:1 for successive 30-day periods after any date on which the borrowing availability under the facility is less than the greater of (1) 12.5% of the commitments under the facility and (2) $50.0 million, until the borrowing availability exceeds the greater of the amount in clause (1) and the amount in clause (2) for a 30-day period.

In order to make acquisitions or investments, our revolving credit facility provides that (1) we must maintain a minimum borrowing availability of at least the greater of $100.0 million or 25% of the total bank commitments under our revolving credit facility or (2) we must maintain a minimum borrowing availability of at least the greater of $70.0 million or 17.5% of the total bank commitments under our revolving credit facility and meet a minimum fixed charge coverage ratio of 1.0:1 under our revolving credit facility. However, we may make specified distributions up to an aggregate of $25.0 million and specified acquisitions up to an aggregate of $25.0 million if either we maintain a minimum borrowing availability of at least the greater of $70.0 million or 17.5% of the total bank commitments under our revolving credit facility or we meet the minimum fixed charge coverage ratio of 1.0:1 under our revolving credit facility. Notwithstanding the foregoing, we may make (1) investments up to $200.0 million in one or more joint ventures that own feedstock, raw material and ethylene pipeline, storage and fractionating facilities and (2) additional investments up to $55.0 million in Suzhou Huasu Plastics Co., Ltd. The revolving credit facility contains other customary covenants and events of default that impose significant operating and financial restrictions on us. These restrictions, among other things, provide limitations on the occurrence of additional indebtedness and our ability to create liens, to engage in certain affiliate transactions and to engage in sale-leaseback transactions. See "Management's Discussion and Analysis of Financial Condition and Results of Operations—Liquidity and Capital Resources—Debt" in the 2013 Form 10-K for more information on the revolving credit facility.

GO Zone and IKE Zone Bonds

As of March 31, 2014, we had drawn all the proceeds from the issuance of the 6 ½% senior notes due 2029, 6 ¾% senior notes due 2032, 6 ½% GO Zone Senior Notes Due 2035 and 6 ½% IKE Zone Senior Notes Due 2035. See "Management's Discussion and Analysis of Financial Condition and Results of Operations—Liquidity and Capital Resources—Debt" in the

27

2013 Form 10-K for more information on the 6 ½% senior notes due 2029, the 6 ¾% senior notes due 2032, the 6 ½% GO Zone Senior Notes Due 2035 and the 6 ½% IKE Zone Senior Notes Due 2035. All domestic restricted subsidiaries that guarantee other debt of ours or of another guarantor of the Senior Notes in excess of $5.0 million are guarantors of these notes.

The indentures governing the Senior Notes contain customary covenants and events of default. Accordingly, these agreements generally impose significant operating and financial restrictions on us. These restrictions, among other things, provide limitations on incurrence of additional indebtedness, the payment of dividends, certain investments and acquisitions and sales of assets. However, the effectiveness of certain of these restrictions is currently suspended because the Senior Notes are currently rated investment grade by at least two nationally recognized credit rating agencies. The most significant of these provisions, if it were currently effective, would restrict us from incurring additional debt, except specified permitted debt (including borrowings under our credit facility), when our fixed charge coverage ratio is below 2.0:1. These limitations are subject to a number of important qualifications and exceptions, including, without limitation, an exception for the payment of our regular quarterly dividend of up to $0.20 per share. If the restrictions were currently effective, distributions in excess of $100.0 million would not be allowed unless, after giving pro forma effect to the distribution, our fixed charge coverage ratio is at least 2.0:1 and such payment, together with the aggregate amount of all other distributions after January 13, 2006, is less than the sum of 50% of our consolidated net income for the period from October 1, 2003 to the end of the most recent quarter for which financial statements have been filed, plus 100% of net cash proceeds received after October 1, 2003 as a contribution to our common equity capital or from the issuance or sale of certain securities, plus several other adjustments.

3.60% Senior Notes due 2022

The 3.60% senior notes due 2022 are unsecured and were issued with an original issue discount of $1.2 million. There is no sinking fund and no scheduled amortization of the 3.60% senior notes due 2022 prior to maturity. See "Management's Discussion and Analysis of Financial Condition and Results of Operations—Liquidity and Capital Resources—Debt" in the 2013 Form 10-K for more information on the 3.60% senior notes due 2022. All of our domestic subsidiaries that guarantee other indebtedness of ours or of another guarantor of the 3.60% senior notes due 2022 in excess of $5.0 million are guarantors of the 3.60% senior notes due 2022.

The indenture governing the 3.60% senior notes due 2022 contains customary events of default and covenants that will restrict our and certain of our subsidiaries' ability to (1) incur certain secured indebtedness, (2) engage in certain sale-leaseback transactions and (3) consolidate, merge or transfer all or substantially all of our assets.

Revenue Bonds

In December 1997, we entered into a loan agreement with a public trust established for public purposes for the benefit of the Parish of Calcasieu, Louisiana. The public trust issued $10.9 million principal amount of tax-exempt waste disposal revenue bonds in order to finance our construction of waste disposal facilities for an ethylene plant. The waste disposal revenue bonds expire in December 2027 and are subject to redemption and mandatory tender for purchase prior to maturity under certain conditions. Interest on the waste disposal revenue bonds accrues at a rate determined by a remarketing agent and is payable quarterly.

Off-Balance Sheet Arrangements

None.

FORWARD-LOOKING STATEMENTS

The Private Securities Litigation Reform Act of 1995 provides safe harbor provisions for forward-looking information. Certain of the statements contained in this report are forward-looking statements. All statements, other than statements of historical facts, included in this report that address activities, events or developments that we expect, project, believe or anticipate will or may occur in the future are forward-looking statements. Forward-looking statements can be identified by the use of words such as "believes," "intends," "may," "should," "could," "anticipates," "expected" or comparable terminology, or by discussions of strategies or trends. Although we believe that the expectations reflected in such forward-looking statements are reasonable, we cannot give any assurances that these expectations will prove to be correct. Forward-looking statements relate to matters such as:

• future operating rates, margins, cash flow and demand for our products;

• industry market outlook;

• production capacities;

• our ability to borrow additional funds under our credit facility;

28

• our ability to meet our liquidity needs;

• our intended quarterly dividends;

• future capacity additions and expansions in the industry;

• timing, funding and results of the expansion programs at our Lake Charles and Calvert City complexes;

• results of the new chlor-alkali plant in Geismar;

• results of the feedstock conversion program at our Calvert City ethylene plant;

• health of our customer base;

• pension plan funding requirements and investment policies;

• compliance with present and future environmental regulations and costs associated with environmentally related penalties, capital expenditures, remedial actions and proceedings, including any new laws, regulations or treaties that may come into force to limit or control carbon dioxide and other greenhouse gases emissions or to address other issues of climate change;

• effects of pending legal proceedings; and

• timing of and amount of capital expenditures.

We have based these statements on assumptions and analyses in light of our experience and perception of historical trends, current conditions, expected future developments and other factors we believe were appropriate in the circumstances when the statements were made. Forward-looking statements by their nature involve substantial risks and uncertainties that could significantly impact expected results, and actual future results could differ materially from those described in such statements. These statements are subject to a number of assumptions, risks and uncertainties, including those described in "Risk Factors" in the 2013 Form 10-K and the following:

• general economic and business conditions;

• the cyclical nature of the chemical industry;

• the availability, cost and volatility of raw materials and energy;

• uncertainties associated with the United States and worldwide economies, including those due to political tensions in the Middle East and elsewhere;

• current and potential governmental regulatory actions in the United States and regulatory actions and political unrest in other countries;

• industry production capacity and operating rates;

• the supply/demand balance for our products;

• competitive products and pricing pressures;

• instability in the credit and financial markets;

• access to capital markets;

• terrorist acts;

• operating interruptions (including leaks, explosions, fires, weather-related incidents, mechanical failure, unscheduled downtime, labor difficulties, transportation interruptions, spills and releases and other environmental risks);

• changes in laws or regulations;

• technological developments;

• our ability to implement our business strategies; and

• creditworthiness of our customers.

Many of these factors are beyond our ability to control or predict. Any of the factors, or a combination of these factors, could materially affect our future results of operations and the ultimate accuracy of the forward-looking statements. These forward-looking statements are not guarantees of our future performance, and our actual results and future developments may differ materially from those projected in the forward-looking statements. Management cautions against putting undue reliance on forward-looking statements or projecting any future results based on such statements or present or prior earnings levels.

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Every forward-looking statement speaks only as of the date of the particular statement, and we undertake no obligation to publicly update or revise any forward-looking statements.

Item 3. Quantitative and Qualitative Disclosures about Market Risk

Commodity Price Risk

A substantial portion of our products and raw materials are commodities whose prices fluctuate as market supply and demand fundamentals change. Accordingly, product margins and the level of our profitability tend to fluctuate with changes in the business cycle. We try to protect against such instability through various business strategies. Our strategies include ethylene feedstock flexibility and moving downstream into the olefins and vinyls products where pricing is more stable. We use derivative instruments in certain instances to reduce price volatility risk on feedstocks and products. Based on our open derivative positions at March 31, 2014, a hypothetical $0.10 increase in the price of a gallon of ethane would have increased our income before taxes by $0.3 million. Additional information concerning derivative commodity instruments appears in Notes 9 and 10 to the unaudited consolidated financial statements within this Quarterly Report on Form 10-Q.

Interest Rate Risk

We are exposed to interest rate risk with respect to fixed and variable rate debt. At March 31, 2014, we had variable rate debt of $10.9 million outstanding. All of the debt outstanding under our revolving credit facility (none was outstanding at March 31, 2014) and our loan relating to the tax-exempt waste disposal revenue bonds are at variable rates. We do not currently hedge our variable interest rate debt, but we may do so in the future. The average variable interest rate for our variable rate debt of $10.9 million as of March 31, 2014 was 0.10%. A hypothetical 100 basis point increase in the average interest rate on our variable rate debt would increase our annual interest expense by approximately $0.1 million. Also, at March 31, 2014, we had $754.0 million aggregate principal amount of fixed rate debt. We are subject to the risk of higher interest cost if and when this debt is refinanced. If interest rates are 1% higher at the time of refinancing, our annual interest expense would increase by approximately $7.5 million.

Item 4. Controls and Procedures

We carried out an evaluation, under the supervision and with the participation of our management, including our President and Chief Executive Officer and our Senior Vice President, Chief Financial Officer and Treasurer, of the effectiveness of our disclosure controls and procedures pursuant to Rules 13a-15 or 15d-15 under the Securities Exchange Act of 1934 as of the end of the period covered by this report. Based upon that evaluation, our President and Chief Executive Officer and our Senior Vice President, Chief Financial Officer and Treasurer concluded that our disclosure controls and procedures are effective with respect to (i) the accumulation and communication to our management, including our Chief Executive Officer and our Chief Financial Officer, of information required to be disclosed by us in the reports that we submit under the Exchange Act, and (ii) the recording, processing, summarizing and reporting of such information within the time periods specified in the SEC's rules and forms.

There were no changes in our internal control over financial reporting that occurred during the three months ended March 31, 2014 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

30

PART II. OTHER INFORMATION

Item 1. Legal Proceedings

The 2013 Form 10-K, filed on February 21, 2014, contained a description of various legal proceedings in which we are involved, including environmental proceedings at our facilities in Calvert City. See Note 15 to the unaudited consolidated financial statements within this Quarterly Report on Form 10-Q for a description of certain of those proceedings, which information is incorporated by reference herein.

Item 1A. Risk Factors

For a discussion of risk factors, please read Item 1A, "Risk Factors" in the 2013 Form 10-K. There have been no material changes from those risk factors.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

The following table provides information on our purchase of equity securities during the quarter ended March 31, 2014. As the transactions presented below were all consummated before the Company’s March 18, 2014 stock-split was effective, all amounts in the table below are presented on a pre-split basis.

Period	Total Number of Shares Purchased (1)	Average Price Paid Per Share		Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs (2)	Maximum Number (or Approximate Dollar Value) of Shares that May Yet Be Purchased Under the Plans or Programs (2)
January 2014	—	$	—	—	$	53,780,000
February 2014	24,723	$	129.13	—	$	53,780,000
March 2014	—	$	—	—	$	53,780,000
	24,723	$	129.13	—

_____________

(1) Represents shares withheld in satisfaction of withholding taxes due upon the vesting of restricted stock and restricted stock units granted to our employees under the 2013 Plan.

(2) On August 22, 2011, we announced the authorization by our Board of Directors of a $100.0 million stock repurchase program. As of March 31, 2014, 1,252,922 shares of common stock (on a post-split basis) had been acquired at an aggregate purchase price of $46.2 million. Decisions regarding the amount and the timing of purchases under the program will be influenced by our cash on hand, our cash flow from operations, general market conditions and other factors. The program may be discontinued by our Board of Directors at any time. None of the purchases during the first quarter of 2014 were pursuant to this program.

31

Item 6. Exhibits

Exhibit No.
31.1	Rule 13a – 14(a) / 15d – 14(a) Certification (Principal Executive Officer)
31.2	Rule 13a – 14(a) / 15d – 14(a) Certification (Principal Financial Officer)
32.1	Section 1350 Certification (Principal Executive Officer and Principal Financial Officer)
101.INS	XBRL Instance Document
101.SCH	XBRL Taxonomy Extension Schema Document
101.CAL	XBRL Taxonomy Extension Calculation Linkbase Document
101.DEF	XBRL Taxonomy Extension Definition Linkbase Document
101.LAB	XBRL Taxonomy Extension Label Linkbase Document
101.PRE	XBRL Taxonomy Extension Presentation Linkbase Document

32

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

		WESTLAKE CHEMICAL CORPORATION
Date:	May 6, 2014	By:	/S/    ALBERT CHAO
			Albert Chao
			President and Chief Executive Officer (Principal Executive Officer)
Date:	May 6, 2014	By:	/S/    M. STEVEN BENDER
			M. Steven Bender
			Senior Vice President, Chief Financial Officer and Treasurer (Principal Financial Officer)

33

EX-31.1

Exhibit 31.1

CERTIFICATIONS

I, Albert Chao, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of Westlake Chemical Corporation;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of registrant's board of directors (or persons performing the equivalent functions):

a) all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

b) any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date:	May 6, 2014	/S/    ALBERT CHAO
		Albert Chao
		President and Chief Executive Officer (Principal Executive Officer)

EX-31.2

Exhibit 31.2

CERTIFICATIONS

I, M. Steven Bender, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of Westlake Chemical Corporation;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of registrant's board of directors (or persons performing the equivalent functions):

a) all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

b) any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date:	May 6, 2014	/S/ M. STEVEN BENDER
		M. Steven Bender
		Senior Vice President, Chief Financial Officer and Treasurer (Principal Financial Officer)

EX-32.1

Exhibit 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Westlake Chemical Corporation (the "Company") on Form 10-Q for the fiscal quarter ended March 31, 2014 as filed with the Securities and Exchange Commission on the date hereof (the "Report"), I, Albert Chao, President and Chief Executive Officer of the Company, and I, M. Steven Bender, Senior Vice President, Chief Financial Officer and Treasurer of the Company, certify, to the best of our knowledge, pursuant to 18 U.S.C. §1350, as adopted pursuant to §906 of the Sarbanes-Oxley Act of 2002, that:

(1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material aspects, the financial condition and results of operations of the Company.

Date:	May 6, 2014	/S/    ALBERT CHAO
		Albert Chao
		President and Chief Executive Officer (Principal Executive Officer)
Date:	May 6, 2014	/S/    M. STEVEN BENDER
		M. Steven Bender
		Senior Vice President, Chief Financial Officer and Treasurer (Principal Financial Officer)

XML

Financial Instruments Marketable Securities (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]
Current	$ 243,694	$ 239,388
Noncurrent	17,195	0
Total Available-for-sale Securities	$ 260,889	$ 239,388

XML

Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Income Tax Disclosure [Abstract]
Effective income tax rate	34.50%	35.50%
U.S. federal statutory income tax rate	35.00%	35.00%
Anticipated reductions to unrecognized tax benefits within next twelve months	$ 2,501

XML

Stock-Based Compensation (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-based compensation expense	$ 2,222	$ 1,499

XML

Guarantor Disclosures (Condensed Consolidating Financial Information Statement of Cash Flows) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Condensed Financial Statements, Captions [Line Items]
Net income	$ 158,032	$ 123,347
Depreciation and amortization	46,337	35,721
Deferred income taxes	8,275	29,466
Net changes in working capital and other	(139)	(72,282)
Net cash provided by operating activities	212,505	116,252
Additions to property, plant and equipment	(110,741)	(150,784)
Proceeds from disposition of assets	12	2
Proceeds from repayment of loan to affiliate	0	167
Proceeds from sales of equity securities	30,119	124,873
Purchase of securities and other investments	(49,025)	(94,903)
Settlements of derivative instruments	(409)	(679)
Net cash used for investing activities	(130,044)	(121,324)
Intercompany financing	0	0
Dividends paid	(16,789)	(12,553)
Proceeds from exercise of stock options	2,158	1,590
Windfall tax benefits from share-based payment arrangements	3,512	3,844
Net cash provided by financing activities	(11,119)	(7,119)
Net increase in cash and cash equivalents	71,342	(12,191)
Cash and cash equivalents at beginning of period	461,301	790,078
Cash and cash equivalents at end of period	532,643	777,887
Westlake Chemical Corporation
Condensed Financial Statements, Captions [Line Items]
Net income	158,032	123,347
Depreciation and amortization	365	365
Deferred income taxes	(162)	(23)
Net changes in working capital and other	(165,553)	(129,403)
Net cash provided by operating activities	(7,318)	(5,714)
Additions to property, plant and equipment	0	0
Proceeds from disposition of assets	0	0
Proceeds from repayment of loan to affiliate		0
Proceeds from sales of equity securities	30,119	124,873
Purchase of securities and other investments	(49,025)	(94,903)
Settlements of derivative instruments	0	0
Net cash used for investing activities	(18,906)	29,970
Intercompany financing	106,903	(28,120)
Dividends paid	(16,789)	(12,553)
Proceeds from exercise of stock options	2,158	1,590
Windfall tax benefits from share-based payment arrangements	3,512	3,844
Net cash provided by financing activities	95,784	(35,239)
Net increase in cash and cash equivalents	69,560	(10,983)
Cash and cash equivalents at beginning of period	420,948	753,881
Cash and cash equivalents at end of period	490,508	742,898
Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net income	161,813	125,726
Depreciation and amortization	45,408	34,766
Deferred income taxes	8,487	29,896
Net changes in working capital and other	6,263	(68,474)
Net cash provided by operating activities	221,971	121,914
Additions to property, plant and equipment	(110,559)	(149,113)
Proceeds from disposition of assets	12	0
Proceeds from repayment of loan to affiliate		0
Proceeds from sales of equity securities	0	0
Purchase of securities and other investments	0	0
Settlements of derivative instruments	(409)	(679)
Net cash used for investing activities	(110,956)	(149,792)
Intercompany financing	(109,346)	28,553
Dividends paid	0	0
Proceeds from exercise of stock options	0	0
Windfall tax benefits from share-based payment arrangements	0	0
Net cash provided by financing activities	(109,346)	28,553
Net increase in cash and cash equivalents	1,669	675
Cash and cash equivalents at beginning of period	6,227	6,973
Cash and cash equivalents at end of period	7,896	7,648
Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net income	(852)	(794)
Depreciation and amortization	564	590
Deferred income taxes	(50)	(407)
Net changes in working capital and other	(1,810)	663
Net cash provided by operating activities	(2,148)	52
Additions to property, plant and equipment	(182)	(1,671)
Proceeds from disposition of assets	0	2
Proceeds from repayment of loan to affiliate		167
Proceeds from sales of equity securities	0	0
Purchase of securities and other investments	0	0
Settlements of derivative instruments	0	0
Net cash used for investing activities	(182)	(1,502)
Intercompany financing	2,443	(433)
Dividends paid	0	0
Proceeds from exercise of stock options	0	0
Windfall tax benefits from share-based payment arrangements	0	0
Net cash provided by financing activities	2,443	(433)
Net increase in cash and cash equivalents	113	(1,883)
Cash and cash equivalents at beginning of period	34,126	29,224
Cash and cash equivalents at end of period	34,239	27,341
Eliminations
Condensed Financial Statements, Captions [Line Items]
Net income	(160,961)	(124,932)
Depreciation and amortization	0	0
Deferred income taxes	0	0
Net changes in working capital and other	160,961	124,932
Net cash provided by operating activities	0	0
Additions to property, plant and equipment	0	0
Proceeds from disposition of assets	0	0
Proceeds from repayment of loan to affiliate		0
Proceeds from sales of equity securities	0	0
Purchase of securities and other investments	0	0
Settlements of derivative instruments	0	0
Net cash used for investing activities	0	0
Intercompany financing	0	0
Dividends paid	0	0
Proceeds from exercise of stock options	0	0
Windfall tax benefits from share-based payment arrangements	0	0
Net cash provided by financing activities	0	0
Net increase in cash and cash equivalents	0	0
Cash and cash equivalents at beginning of period	0	0
Cash and cash equivalents at end of period	$ 0	$ 0

XML

Earnings per Share (Additional Information) (Detail)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Earnings Per Share [Abstract]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	69,662	72,776

XML

Long-Term Debt (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Long-term debt	$ 763,909	$ 763,879
3.60% Senior Notes Due 2022
Debt Instrument [Line Items]
Maturity	2022
Stated interest rate	3.60%
Senior notes	249,020	248,990
6 1/2% Senior Notes Due 2029
Debt Instrument [Line Items]
Maturity	2029
Stated interest rate	6.50%
Senior notes	100,000	100,000
6 3/4% Senior Notes Due 2032
Debt Instrument [Line Items]
Maturity	2032
Stated interest rate	6.75%
Senior notes	250,000	250,000
2035 GO Zone 6 1/2% Notes
Debt Instrument [Line Items]
Maturity	2035
Stated interest rate	6.50%
Senior notes	89,000	89,000
2035 IKE Zone 6 1/2% Notes
Debt Instrument [Line Items]
Maturity	2035
Stated interest rate	6.50%
Senior notes	65,000	65,000
Loan Related To Tax-Exempt Waste Disposal Revenue Bonds Due 2027
Debt Instrument [Line Items]
Maturity	2027
Non-current loan payable	$ 10,889	$ 10,889

XML

Pension and Post-Retirement Benefit Costs (Tables)

3 Months Ended

Mar. 31, 2014

Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]

Components of Net Periodic Benefit Cost

Components of net periodic benefit cost are as follows:

	Three Months Ended March 31,
	Pension						Post-retirement Healthcare
	2014			2013			2014		2013
Service cost	$	84		$	264		$	5	$	2
Interest cost	595			501			181		147
Expected return on plan assets	(809		)	(714		)	—		—
Amortization of prior service cost	74			74			13		21
Amortization of net loss	63			429			69		90
Net periodic benefit cost	$	7		$	554		$	268	$	260

XML

Earnings per Share (Reconciliation of Denominator for Basic and Diluted Earnings Per Share) (Details) (USD $)	0 Months Ended	3 Months Ended
	Feb. 14, 2014	Mar. 31, 2014		Mar. 31, 2013
Earnings Per Share [Abstract]
Basic		133,072,254	[1]	133,251,071	[1]
Plus incremental shares from: Assumed exercise of options		540,670	[1]	566,666	[1]
Weighted average common shares-diluted		133,612,924	[1]	133,817,737	[1]
Earnings per share: Basic		$ 1.18	[1]	$ 0.92	[1]
Earnings per share: Diluted		$ 1.18	[1]	$ 0.92	[1]
Stock split conversion ratio	2
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		69,662		72,776

[1] Share amounts and per share data for the three months ended March 31, 2013 have been restated to reflect the effect of a two-for-one stock split on March 18, 2014. See Note 1 for additional information.

XML

Basis of Financial Statements (Policies)

3 Months Ended

Mar. 31, 2014

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Financial Statements

Basis of Financial Statements

The accompanying unaudited consolidated interim financial statements were prepared in accordance with the rules and regulations of the Securities and Exchange Commission (the "SEC") for interim periods. Accordingly, certain information and footnotes required for complete financial statements under generally accepted accounting principles in the United States ("U.S. GAAP") have not been included. These interim consolidated financial statements should be read in conjunction with the December 31, 2013 financial statements and notes thereto of Westlake Chemical Corporation (the "Company") included in the annual report on Form 10-K for the fiscal year ended December 31, 2013 (the "2013 Form 10-K"), filed with the SEC on February 21, 2014. These financial statements have been prepared in conformity with the accounting principles and practices as disclosed in the notes to the consolidated financial statements of the Company for the fiscal year ended December 31, 2013.

In the opinion of the Company's management, the accompanying unaudited consolidated interim financial statements reflect all adjustments (consisting only of normal recurring adjustments) that are necessary for a fair statement of the Company's financial position as of March 31, 2014, its results of operations for the three months ended March 31, 2014 and 2013 and the changes in its cash position for the three months ended March 31, 2014 and 2013.

Results of operations and changes in cash position for the interim periods presented are not necessarily indicative of the results that will be realized for the fiscal year ending December 31, 2014 or any other interim period. The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses and the disclosure of contingent assets and liabilities. Actual results could differ from those estimates.

On February 14, 2014, the Company's Board of Directors authorized a two-for-one split of the Company's common stock. Stockholders of record as of February 28, 2014 were entitled to one additional share for every share outstanding, which was distributed on March 18, 2014. The total number of authorized common stock shares and associated par value were unchanged by this stock split. All share amounts and per share data included in the accompanying consolidated financial statements and related notes have been restated to reflect the effect of the stock split.

Recent Accounting Pronouncements

Recent Accounting Pronouncements

There are no recently issued accounting standards which are expected to impact the Company's consolidated financial position, results of operations or cash flows.

XML

Derivative Instruments (Fair Values of Derivative Instruments in Consolidated Balance Sheets) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Accrued Liabilities
Derivatives, Fair Value [Line Items]
Total derivative liabilities	$ 54	$ 176
Accounts Receivable
Derivatives, Fair Value [Line Items]
Total derivative assets	248	296
Forward Contracts [Member] | Accrued Liabilities
Derivatives, Fair Value [Line Items]
Not designated as hedging instruments, Derivative Liabilities	54	176
Forward Contracts [Member] | Accounts Receivable
Derivatives, Fair Value [Line Items]
Not designated as hedging instruments, Derivative Assets	$ 248	$ 296

XML

Accounts Receivable (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Accounts Receivable, Net [Abstract]
Trade customers	$ 415,812	$ 410,302
Affiliates	287	315
Allowance for doubtful accounts	(11,592)	(11,741)
Receivables from trade customers and affiliates, net	404,507	398,876
Federal and state taxes	5,248	20,820
Other	12,124	8,761
Accounts receivable, net	$ 421,879	$ 428,457

XML

Basis of Financial Statements Basis (Details)	0 Months Ended
	Feb. 14, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Stock split conversion ratio	2

XML

Fair Value Measurements (Summary of Assets and Liabilities Accounted at Fair Value on Recurring Basis) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for Sale	$ 243,694	$ 239,388
Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for Sale	260,889	239,388
Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for Sale	100,603	91,595
Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for Sale	160,286	147,793
Recurring | Forward Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Risk management assets - Commodity forward contracts	248	296
Risk management liabilities - Commodity forward contracts	(54)	(176)
Recurring | Forward Contracts [Member] | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Risk management assets - Commodity forward contracts	0	48
Risk management liabilities - Commodity forward contracts	0	0
Recurring | Forward Contracts [Member] | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Risk management assets - Commodity forward contracts	248	248
Risk management liabilities - Commodity forward contracts	$ (54)	$ (176)

XML

Guarantor Disclosures (Additional Information) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Condensed Financial Statements, Captions [Line Items]
Ownership interest in guarantor subsidiaries	100.00%
3.60% Senior Notes Due 2022
Condensed Financial Statements, Captions [Line Items]
Stated interest rate	3.60%
Maturity	2022
Minimum debt amount guaranteed by subsidiaries	$ 5,000

XML

Accumulated Other Comprehensive Income Reclassifications in AOCI (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income before income taxes	$ 241,407		$ 191,293
Provision for income taxes	(83,375)		(67,946)
Net income	158,032		123,347
Nonoperating Income (Expense)	2,509		3,519
Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net income	(151)		(378)
Accumulated Defined Benefit Plans Adjustment | Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Prior service costs	(87)	[1]	(95)	[1]
Net loss	(132)	[1]	(519)	[1]
Income before income taxes	(219)		(614)
Provision for income taxes	84		236
Net income	(135)		(378)
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Provision for income taxes	9		0
Net income	(16)		0
Nonoperating Income (Expense)	$ (25)		$ 0

[1] These accumulated other comprehensive loss components are included in the computation of net periodic benefit cost. For additional information, please read Note 10 (Employee Benefits) to the financial statements included in the 2013 Form 10-K.

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Long-Term Debt (Revolving Credit Facility) (Details) (Line of Credit, USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 400,000
Percentage of commitment on borrowing availability	0.375%
Letters of credit outstanding	16,921
Remaining borrowing capacity	383,079
Minimum
Line of Credit Facility [Line Items]
Increase in credit facility borrowings	25,000
Maximum
Line of Credit Facility [Line Items]
Increase in credit facility borrowings	$ 150,000
Plus Libor | Minimum
Line of Credit Facility [Line Items]
Percentage added to basis to find interest rate	1.75%
Plus Libor | Maximum
Line of Credit Facility [Line Items]
Percentage added to basis to find interest rate	2.25%
Plus Base Rate | Minimum
Line of Credit Facility [Line Items]
Percentage added to basis to find interest rate	0.25%
Plus Base Rate | Maximum
Line of Credit Facility [Line Items]
Percentage added to basis to find interest rate	0.75%

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Accounts Receivable

3 Months Ended

Mar. 31, 2014

Accounts Receivable, Net [Abstract]

Accounts Receivable

Accounts Receivable

Accounts receivable consist of the following:

	March 31, 2014			December 31, 2013
Trade customers	$	415,812		$	410,302
Affiliates	287			315
Allowance for doubtful accounts	(11,592		)	(11,741		)
	404,507			398,876
Federal and state taxes	5,248			20,820
Other	12,124			8,761
Accounts receivable, net	$	421,879		$	428,457

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Commitments and Contingencies (Additional Information) (Detail) (USD $) In Thousands, unless otherwise specified	0 Months Ended	1 Months Ended		12 Months Ended
	Mar. 17, 2010	Dec. 31, 2007	Dec. 31, 2007 Polyone	Dec. 31, 2013 Polyone
Commitments and Contingencies Disclosure [Line Items]
Minimum number of years between arbitrations		5 years
Reimbursement of remediation costs sought by PolyOne	$ 1,400
Percentage of costs related to environmental issues to be paid by PolyOne			100.00%
Costs incurred environmental remediation services				$ 3,284

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Inventories (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Inventory Disclosure [Abstract]
Finished products	$ 240,339	$ 232,658
Feedstock, additives and chemicals	139,189	180,646
Materials and supplies	59,481	58,575
Inventories	$ 439,009	$ 471,879

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Long-Term Debt (Tables)

3 Months Ended

Mar. 31, 2014

Debt Disclosure [Abstract]

Schedule Of Long-Term Debt

Long-term debt consists of the following:

	March 31, 2014		December 31, 2013
3.60% senior notes due 2022	$	249,020	$	248,990
6 ½% senior notes due 2029	100,000		100,000
6 ¾% senior notes due 2032	250,000		250,000
6 ½% senior notes due 2035 (the "6 ½% GO Zone Senior Notes Due 2035")	89,000		89,000
6 ½% senior notes due 2035 (the "6 ½% IKE Zone Senior Notes Due 2035")	65,000		65,000
Loan related to tax-exempt waste disposal revenue bonds due 2027	10,889		10,889
Long-term debt, net	$	763,909	$	763,879

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Inventories (Tables)

3 Months Ended

Mar. 31, 2014

Inventory Disclosure [Abstract]

Schedule Of Inventory

Inventories consist of the following:

	March 31, 2014		December 31, 2013
Finished products	$	240,339	$	232,658
Feedstock, additives and chemicals	139,189		180,646
Materials and supplies	59,481		58,575
Inventories	$	439,009	$	471,879

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Earnings per Share (Schedule of Net Income Attributable to Common Stockholders) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Earnings Per Share [Abstract]
Net income	$ 158,032	$ 123,347
Less: Net income attributable to participating securities	(384)	(568)
Net income attributable to common shareholders	$ 157,648	$ 122,779

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Property, Plant and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Property, Plant and Equipment [Abstract]
Property, plant and equipment	$ 2,150,643		$ 2,088,014
Depreciation expense on property, plant and equipment	$ 38,061	$ 30,920

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Derivative Instruments (Tables)

3 Months Ended

Mar. 31, 2014

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Fair Values of Derivatives Instruments in Consolidated Balance Sheets

The fair values of derivative instruments in the Company's consolidated balance sheets were as follows:

	Derivative Assets
	Balance Sheet Location	Fair Value as of
		March 31, 2014		December 31, 2013
Not designated as hedging instruments
Commodity forward contracts	Accounts receivable, net	$	248	$	296
Total derivative assets		$	248	$	296

	Derivative Liabilities
	Balance Sheet Location	Fair Value as of
		March 31, 2014		December 31, 2013
Not designated as hedging instruments
Commodity forward contracts	Accrued liabilities	$	54	$	176
Total derivative liabilities		$	54	$	176

Impact of Derivatives Instruments Designated as Fair Value Hedges

The following tables reflect the impact of derivative instruments designated as fair value hedges and the related hedged item on the Company's consolidated statements of operations. For the three months ended March 31, 2013, there was no material ineffectiveness with regard to the Company's qualifying fair value hedges.

Derivatives in Fair Value    Hedging Relationships	Location of Gain (Loss) Recognized in  Income on Derivative	Three Months Ended March 31,
		2014		2013
Commodity forward contracts	Cost of sales	$	—	$	(1,643	)
Hedged Items in Fair Value    Hedging Relationships	Location of Gain (Loss) Recognized in  Income on Hedged Items	Three Months Ended March 31,
		2014		2013
Firm commitment designated as the hedged item	Cost of sales	$	—	$	1,395

Impact of Derivative Instruments Not Designated as Fair Value Hedges

The impact of derivative instruments that have not been designated as hedges on the Company's consolidated statements of operations were as follows:

Derivatives Not Designated as    Hedging Instruments	Location of Gain (Loss) Recognized in  Income on Derivative	Three Months Ended March 31,
		2014			2013
Commodity forward contracts	Gross profit	$	(611	)	$	7,335

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Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2014

Fair Value Disclosures [Abstract]

Summary Of Assets And Liabilities Accounted At Fair Value On A Recurring Basis

The following tables summarize, by level within the fair value hierarchy, the Company's assets and liabilities that were accounted for at fair value on a recurring basis:

	March 31, 2014
	Level 1		Level 2			Total
Derivative instruments
Risk management assets - Commodity forward contracts	$	—	$	248		$	248
Risk management liabilities - Commodity forward contracts	—		(54		)	(54		)
Available-for-sale marketable securities	100,603		160,286			260,889
	December 31, 2013
	Level 1		Level 2			Total
Derivative instruments
Risk management assets - Commodity forward contracts	$	48	$	248		$	296
Risk management liabilities - Commodity forward contracts	—		(176		)	(176		)
Available-for-sale marketable securities	91,595		147,793			239,388

Summary Of Carrying And Fair Values Of Long-Term Debt

The carrying and fair values of the Company's long-term debt are summarized in the table below. The Company's long-term debt instruments are publicly-traded. A market approach, based upon quotes from financial reporting services, is used to measure the fair value of the Company's long-term debt. Because the Company's long-term debt instruments may not be actively traded, the inputs used to measure the fair value of the Company's long-term debt are classified as Level 2 inputs within the fair value hierarchy.

	March 31, 2014				December 31, 2013
	Carrying Value		Fair Value		Carrying Value		Fair Value
3.60% senior notes due 2022	$	249,020	$	242,600	$	248,990	$	236,905
6 ½% senior notes due 2029	100,000		113,000		100,000		109,490
6 ¾% senior notes due 2032	250,000		281,775		250,000		265,148
6 ½% GO Zone Senior Notes Due 2035	89,000		101,238		89,000		94,606
6 ½% IKE Zone Senior Notes Due 2035	65,000		73,938		65,000		69,094
Loan related to tax-exempt waste disposal revenue    bonds due 2027	10,889		10,889		10,889		10,889

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Financial Instruments

3 Months Ended

Mar. 31, 2014

Investments, Debt and Equity Securities [Abstract]

Financial Instruments

Financial Instruments

Cash Equivalents

The Company had $411,527 and $263,967 of held-to-maturity securities with original maturities of three months or less, primarily consisting of corporate debt securities, classified as cash equivalents at March 31, 2014 and December 31, 2013, respectively. The Company's investments in held-to-maturity securities are held at amortized cost, which approximates fair value.

Available-for-Sale Marketable Securities

Investments in available-for-sale securities were classified as follows:

	March 31, 2014		December 31, 2013
Current	$	243,694	$	239,388
Non-current	17,195		—
Total available-for-sale securities	$	260,889	$	239,388

The cost, gross unrealized gains, gross unrealized losses and fair value of the Company’s available-for-sale securities were as follows:

	March 31, 2014
	Cost		Gross Unrealized Gains		Gross Unrealized Losses (1)			Fair Value
Debt securities
Corporate bonds	$	116,669	$	470	$	(41	)	$	117,098
U.S. government debt (2)	102,201		133		(46		)	102,288
Asset-backed securities	24,268		47		(7		)	24,308
Equity securities	14,985		2,210		—			17,195
Total available-for-sale securities	$	258,123	$	2,860	$	(94	)	$	260,889

	December 31, 2013
	Cost		Gross Unrealized Gains		Gross Unrealized Losses (1)			Fair Value
Debt securities
Corporate bonds	$	108,300	$	340	$	(69	)	$	108,571
U.S. government debt (2)	106,335		60		(79		)	106,316
Asset-backed securities	24,478		34		(11		)	24,501
Total available-for-sale securities	$	239,113	$	434	$	(159	)	$	239,388

_____________

(1) All unrealized loss positions were held at a loss for less than 12 months.

(2) U.S. Treasury obligations, U.S. government agency obligations and U.S government agency mortgage-backed securities.

As of March 31, 2014 and December 31, 2013, net unrealized gains on the Company's available-for-sale securities of $1,773 and $176, respectively, net of income tax expense of $993 and $99, respectively, were recorded in accumulated other comprehensive income. See Note 10 for the fair value hierarchy of the Company’s available-for-sale securities.

As of March 31, 2014, the corporate bond securities held by the Company had maturities between one month to five years; U.S. government debt securities, excluding U.S. government agency mortgage-backed securities, had maturities between one month to four years; U.S. government agency mortgage-backed securities had maturities between one to 29 years; and asset-backed securities had maturities between one to six years.

The proceeds from sales and maturities of available-for-sale securities and the gross realized gains and losses included in the consolidated statement of operations are reflected in the table below. The cost of securities sold was determined using the specific identification method. There were no sales or maturities of available-for-sale securities during the three months ended March 31, 2013.

	Three Months Ended March 31,
	2014
Proceeds from sales and maturities of securities	$	30,119
Gross realized gains	13
Gross realized losses	(38		)

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Earnings per Share (Tables)

3 Months Ended

Mar. 31, 2014

Earnings Per Share [Abstract]

Schedule Of Net Income Attributable To Common Stockholders

	Three Months Ended March 31,
	2014			2013
Net income	$	158,032		$	123,347
Less:
Net income attributable to participating securities	(384		)	(568		)
Net income attributable to common shareholders	$	157,648		$	122,779

Reconciliation Of Denominator For Basic And Diluted Earnings Per Share

The following table reconciles the denominator for the basic and diluted earnings per share computations shown in the consolidated statements of operations:

	Three Months Ended March 31,
	2014		2013
Weighted average common shares—basic (1)	133,072,254		133,251,071
Plus incremental shares from:
Assumed exercise of options (1)	540,670		566,666
Weighted average common shares—diluted (1)	133,612,924		133,817,737
Earnings per share: (1)
Basic	$	1.18	$	0.92
Diluted	$	1.18	$	0.92

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Financial Instruments Available-for-sale Securities (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Cost	$ 258,123	$ 239,113
GrossUnrealizedGain	2,860	434
GrossUnrealizedLoss	(94)	(159)
Fair Value	(260,889)	(239,388)
Available-for-sale Securities, Change in Net Unrealized Holding Gain (Loss), Net of Tax	1,773	176
Available-for-sale Securities, Income Tax Expense on Change in Unrealized Holding Gain (Loss)	993	99
Proceeds from Sale of Available-for-sale Securities	30,119
Gross Realized Gains	13
Gross Realized Losses	38
Corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Cost	116,669	108,300
GrossUnrealizedGain	470	340
GrossUnrealizedLoss	(41)	(69)
Fair Value	(117,098)	(108,571)
U.S. government debt
Schedule of Available-for-sale Securities [Line Items]
Cost	102,201	106,335
GrossUnrealizedGain	133	60
GrossUnrealizedLoss	(46)	(79)
Fair Value	(102,288)	(106,316)
Asset-backed securities
Schedule of Available-for-sale Securities [Line Items]
Cost	24,268	24,478
GrossUnrealizedGain	47	34
GrossUnrealizedLoss	(7)	(11)
Fair Value	(24,308)	(24,501)
Equity Securities
Schedule of Available-for-sale Securities [Line Items]
Cost	14,985
GrossUnrealizedGain	2,210
GrossUnrealizedLoss	0
Fair Value	$ (17,195)

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Fair Value Measurements (Summary of Carrying and Fair Values of Long Term Debt) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended					3 Months Ended					3 Months Ended					3 Months Ended					3 Months Ended					3 Months Ended
	Mar. 31, 2014 3.60% Senior Notes Due 2022	Mar. 31, 2014 3.60% Senior Notes Due 2022 Carrying Value	Dec. 31, 2013 3.60% Senior Notes Due 2022 Carrying Value	Mar. 31, 2014 3.60% Senior Notes Due 2022 Fair Value	Dec. 31, 2013 3.60% Senior Notes Due 2022 Fair Value	Mar. 31, 2014 6 1/2% Senior Notes Due 2029	Mar. 31, 2014 6 1/2% Senior Notes Due 2029 Carrying Value	Dec. 31, 2013 6 1/2% Senior Notes Due 2029 Carrying Value	Mar. 31, 2014 6 1/2% Senior Notes Due 2029 Fair Value	Dec. 31, 2013 6 1/2% Senior Notes Due 2029 Fair Value	Mar. 31, 2014 6 3/4% Senior Notes Due 2032	Mar. 31, 2014 6 3/4% Senior Notes Due 2032 Carrying Value	Dec. 31, 2013 6 3/4% Senior Notes Due 2032 Carrying Value	Mar. 31, 2014 6 3/4% Senior Notes Due 2032 Fair Value	Dec. 31, 2013 6 3/4% Senior Notes Due 2032 Fair Value	Mar. 31, 2014 2035 GO Zone 6 1/2% Notes	Mar. 31, 2014 2035 GO Zone 6 1/2% Notes Carrying Value	Dec. 31, 2013 2035 GO Zone 6 1/2% Notes Carrying Value	Mar. 31, 2014 2035 GO Zone 6 1/2% Notes Fair Value	Dec. 31, 2013 2035 GO Zone 6 1/2% Notes Fair Value	Mar. 31, 2014 2035 IKE Zone 6 1/2% Notes	Mar. 31, 2014 2035 IKE Zone 6 1/2% Notes Carrying Value	Dec. 31, 2013 2035 IKE Zone 6 1/2% Notes Carrying Value	Mar. 31, 2014 2035 IKE Zone 6 1/2% Notes Fair Value	Dec. 31, 2013 2035 IKE Zone 6 1/2% Notes Fair Value	Mar. 31, 2014 Loan Related To Tax-Exempt Waste Disposal Revenue Bonds Due 2027	Mar. 31, 2014 Loan Related To Tax-Exempt Waste Disposal Revenue Bonds Due 2027 Carrying Value	Dec. 31, 2013 Loan Related To Tax-Exempt Waste Disposal Revenue Bonds Due 2027 Carrying Value	Mar. 31, 2014 Loan Related To Tax-Exempt Waste Disposal Revenue Bonds Due 2027 Fair Value	Dec. 31, 2013 Loan Related To Tax-Exempt Waste Disposal Revenue Bonds Due 2027 Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Maturity	2022					2029					2032					2035					2035					2027
Stated interest rate	3.60%					6.50%					6.75%					6.50%					6.50%
Senior notes		$ 249,020	$ 248,990	$ 242,600	$ 236,905		$ 100,000	$ 100,000	$ 113,000	$ 109,490		$ 250,000	$ 250,000	$ 281,775	$ 265,148		$ 89,000	$ 89,000	$ 101,238	$ 94,606		$ 65,000	$ 65,000	$ 73,938	$ 69,094
Loans																											$ 10,889	$ 10,889	$ 10,889	$ 10,889

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Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Current assets
Cash and cash equivalents	$ 532,643	$ 461,301
Marketable Securities, Current	243,694	239,388
Accounts receivable, net	421,879	428,457
Inventories	439,009	471,879
Prepaid expenses and other current assets	15,880	13,888
Deferred income taxes	34,158	34,169
Total current assets	1,687,263	1,649,082
Property, plant and equipment, net	2,150,643	2,088,014
Equity investments	67,560	66,875
Other assets, net
Intangible assets, net	157,086	159,046
Deferred charges and other assets	109,404	97,892
Total other assets, net	266,490	256,938
Total assets	4,171,956	4,060,909
Current liabilities
Accounts payable	211,952	249,613
Accrued liabilities	147,982	155,245
Total current liabilities	359,934	404,858
Long-term debt	763,909	763,879
Deferred income taxes	447,203	437,976
Other liabilities	32,338	35,593
Total liabilities	1,603,384	1,642,306
Commitments and contingencies (Notes 7 and 15)
Stockholders' equity
Preferred stock, $0.01 par value, 50,000,000 shares authorized; no shares issued and outstanding	0	0
Common stock, $0.01 par value, 150,000,000 shares authorized; 134,682,004 and 134,580,208 shares issued at March 31, 2014 and December 31, 2013, respectively (Note 1)	1,347	1,346
Common stock, held in treasury, at cost; 1,252,922 shares at March 31, 2014 and December 31, 2013 (Note 1)	(46,220)	(46,220)
Additional paid-in capital	519,323	511,432
Retained earnings	2,095,904	1,954,661
Accumulated other comprehensive loss	(1,782)	(2,616)
Total stockholders' equity	2,568,572	2,418,603
Total liabilities and stockholders' equity	$ 4,171,956	$ 4,060,909

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Other Assets (Additional Information) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014 Olefins	Dec. 31, 2013 Olefins	Mar. 31, 2014 Vinyls	Dec. 31, 2013 Vinyls
Segment Reporting Information [Line Items]
Goodwill			$ 29,990	$ 29,990	$ 32,026	$ 32,026
Amortization expense on intangible assets, included in other assets	$ 8,276	$ 4,801

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Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Cash flows from operating activities
Net income	$ 158,032	$ 123,347
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	45,972	35,356
Provision for (recovery of) doubtful accounts	(144)	393
Amortization of debt issuance costs	365	365
Stock-based compensation expense	2,222	1,499
Loss from disposition of fixed assets	855	2,387
Deferred income taxes	8,275	29,466
Windfall tax benefits from share-based payment arrangements	(3,512)	(3,844)
Equity in (income) loss of joint ventures	(685)	(178)
Other Operating Activities, Cash Flow Statement	444	0
Changes in operating assets and liabilities
Accounts receivable	5,332	(7,917)
Inventories	32,870	(8,776)
Prepaid expenses and other current assets	(1,478)	(2,077)
Accounts payable	(29,706)	14,733
Accrued liabilities	(4,952)	(14,670)
Other, net	(1,385)	(53,832)
Net cash provided by operating activities	212,505	116,252
Cash flows from investing activities
Additions to property, plant and equipment	(110,741)	(150,784)
Proceeds from disposition of assets	12	2
Proceeds from repayment of loan to affiliate	0	167
Proceeds from sale and maturities of securities	30,119	124,873
Purchase of securities and other investments	(49,025)	(94,903)
Settlements of derivative instruments	(409)	(679)
Net cash used for investing activities	(130,044)	(121,324)
Cash flows from financing activities
Dividends paid	(16,789)	(12,553)
Proceeds from exercise of stock options	2,158	1,590
Windfall tax benefits from share-based payment arrangements	3,512	3,844
Net cash provided by financing activities	(11,119)	(7,119)
Net increase in cash and cash equivalents	71,342	(12,191)
Cash and cash equivalents at beginning of period	461,301	790,078
Cash and cash equivalents at end of period	$ 532,643	$ 777,887

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Pension and Post-Retirement Benefit Costs (Additional Information) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Document Fiscal Year Focus	2014
Salaried Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Employer contribution	$ 388
Expected additional contributions	2,389
Wage Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Employer contribution	290	60
Expected additional contributions	$ 916

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Segment Information (Tables)

3 Months Ended

Mar. 31, 2014

Segment Reporting [Abstract]

Segment Reporting Information

	Three Months Ended March 31,
	2014			2013
Net external sales
Olefins
Polyethylene	$	487,144		$	420,768
Styrene, feedstock and other	235,654			162,077
Total Olefins	722,798			582,845
Vinyls
PVC, caustic soda and other	190,527			195,246
Building products	114,351			86,556
Total Vinyls	304,878			281,802
	$	1,027,676		$	864,647
Intersegment sales
Olefins	$	56,853		$	70,283
Vinyls	343			264
	$	57,196		$	70,547
Income (loss) from operations
Olefins	$	272,333		$	161,058
Vinyls	(21,114		)	43,663
Corporate and other	(3,164		)	(10,666		)
	$	248,055		$	194,055
Depreciation and amortization
Olefins	$	26,647		$	23,346
Vinyls	19,168			11,884
Corporate and other	157			126
	$	45,972		$	35,356
Other income (expense), net
Olefins	$	1,454		$	4,010
Vinyls	(34		)	(425		)
Corporate and other	1,089			(66		)
	$	2,509		$	3,519
Provision for (benefit from) income taxes
Olefins	$	93,550		$	55,477
Vinyls	(10,070		)	13,720
Corporate and other	(105		)	(1,251		)
	$	83,375		$	67,946

	Three Months Ended March 31,
	2014		2013
Capital expenditures
Olefins	$	29,074	$	50,040
Vinyls	81,120		100,317
Corporate and other	547		427
	$	110,741	$	150,784

Reconciliation Of Total Segment Income From Operations To Consolidated Income Before Income Taxes

A reconciliation of total segment income from operations to consolidated income before income taxes is as follows:

	Three Months Ended March 31,
	2014			2013
Income from operations	$	248,055		$	194,055
Interest expense	(9,157		)	(6,281		)
Other income, net	2,509			3,519
Income before income taxes	$	241,407		$	191,293

Total Assets

	March 31, 2014		December 31, 2013
Total assets
Olefins	$	1,556,856	$	1,557,510
Vinyls	1,768,572		1,740,595
Corporate and other	846,528		762,804
	$	4,171,956	$	4,060,909

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Segment Information (Reconciliation of Total Segment Income from Operations to Consolidated Income before Income Taxes) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Segment Reporting [Abstract]
Income from operations	$ 248,055	$ 194,055
Interest expense	(9,157)	(6,281)
Other (expense) income, net	2,509	3,519
Income before income taxes	$ 241,407	$ 191,293

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Segment Information

3 Months Ended

Mar. 31, 2014

Segment Reporting [Abstract]

Segment Information

Segment Information

The Company operates in two principal operating segments: Olefins and Vinyls. These segments are strategic business units that offer a variety of different products. The Company manages each segment separately as each business requires different technology and marketing strategies.

	Three Months Ended March 31,
	2014			2013
Net external sales
Olefins
Polyethylene	$	487,144		$	420,768
Styrene, feedstock and other	235,654			162,077
Total Olefins	722,798			582,845
Vinyls
PVC, caustic soda and other	190,527			195,246
Building products	114,351			86,556
Total Vinyls	304,878			281,802
	$	1,027,676		$	864,647
Intersegment sales
Olefins	$	56,853		$	70,283
Vinyls	343			264
	$	57,196		$	70,547
Income (loss) from operations
Olefins	$	272,333		$	161,058
Vinyls	(21,114		)	43,663
Corporate and other	(3,164		)	(10,666		)
	$	248,055		$	194,055
Depreciation and amortization
Olefins	$	26,647		$	23,346
Vinyls	19,168			11,884
Corporate and other	157			126
	$	45,972		$	35,356
Other income (expense), net
Olefins	$	1,454		$	4,010
Vinyls	(34		)	(425		)
Corporate and other	1,089			(66		)
	$	2,509		$	3,519
Provision for (benefit from) income taxes
Olefins	$	93,550		$	55,477
Vinyls	(10,070		)	13,720
Corporate and other	(105		)	(1,251		)
	$	83,375		$	67,946

	Three Months Ended March 31,
	2014		2013
Capital expenditures
Olefins	$	29,074	$	50,040
Vinyls	81,120		100,317
Corporate and other	547		427
	$	110,741	$	150,784

A reconciliation of total segment income from operations to consolidated income before income taxes is as follows:

	Three Months Ended March 31,
	2014			2013
Income from operations	$	248,055		$	194,055
Interest expense	(9,157		)	(6,281		)
Other income, net	2,509			3,519
Income before income taxes	$	241,407		$	191,293

	March 31, 2014		December 31, 2013
Total assets
Olefins	$	1,556,856	$	1,557,510
Vinyls	1,768,572		1,740,595
Corporate and other	846,528		762,804
	$	4,171,956	$	4,060,909

XML

Guarantor Disclosures (Tables)

3 Months Ended

Mar. 31, 2014

Guarantees [Abstract]

Condensed Consolidating Financial Information Balance Sheet

Condensed Consolidating Financial Information as of March 31, 2014

	Westlake Chemical Corporation		Guarantor Subsidiaries		Non- Guarantor Subsidiaries		Eliminations			Consolidated
Balance Sheet
Current assets
Cash and cash equivalents	$	490,508	$	7,896	$	34,239	$	—		$	532,643
Marketable securities	243,694		—		—		—			243,694
Accounts receivable, net	58,050		888,829		3,381		(528,381		)	421,879
Inventories	—		422,166		16,843		—			439,009
Prepaid expenses and other    current assets	889		12,864		2,127		—			15,880
Deferred income taxes	441		33,422		295		—			34,158
Total current assets	793,582		1,365,177		56,885		(528,381		)	1,687,263
Property, plant and equipment, net	—		2,144,266		6,377		—			2,150,643
Equity investments	2,975,949		101,472		31,056		(3,040,917		)	67,560
Other assets, net	31,493		238,867		1,176		(5,046		)	266,490
Total assets	$	3,801,024	$	3,849,782	$	95,494	$	(3,574,344	)	$	4,171,956
Current liabilities
Accounts payable	$	463,650	$	193,020	$	14,351	$	(459,069	)	$	211,952
Accrued liabilities	15,782		200,781		731		(69,312		)	147,982
Total current liabilities	479,432		393,801		15,082		(528,381		)	359,934
Long-term debt	753,020		10,889		—		—			763,909
Deferred income taxes	—		451,597		652		(5,046		)	447,203
Other liabilities	—		32,308		30		—			32,338
Stockholders' equity	2,568,572		2,961,187		79,730		(3,040,917		)	2,568,572
Total liabilities and stockholders' equity	$	3,801,024	$	3,849,782	$	95,494	$	(3,574,344	)	$	4,171,956

Condensed Consolidating Financial Information as of December 31, 2013

	Westlake Chemical Corporation		Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Eliminations			Consolidated
Balance Sheet
Current assets
Cash and cash equivalents	$	420,948	$	6,227	$	34,126	$	—		$	461,301
Marketable securities	239,388		—		—		—			239,388
Accounts receivable, net	3,879		738,156		2,755		(316,333		)	428,457
Inventories	—		456,306		15,573		—			471,879
Prepaid expenses and other    current assets	778		11,312		1,798		—			13,888
Deferred income taxes	441		33,422		306		—			34,169
Total current assets	665,434		1,245,423		54,558		(316,333		)	1,649,082
Property, plant and equipment, net	—		2,081,091		6,923		—			2,088,014
Equity investments	2,815,752		100,326		31,518		(2,880,721		)	66,875
Other assets, net	15,393		246,125		1,199		(5,779		)	256,938
Total assets	$	3,496,579	$	3,672,965	$	94,198	$	(3,202,833	)	$	4,060,909
Current liabilities
Accounts payable	$	316,652	$	223,134	$	10,649	$	(300,822	)	$	249,613
Accrued liabilities	8,334		161,140		1,282		(15,511		)	155,245
Total current liabilities	324,986		384,274		11,931		(316,333		)	404,858
Long-term debt	752,990		10,889		—		—			763,879
Deferred income taxes	—		443,026		729		(5,779		)	437,976
Other liabilities	—		35,533		60		—			35,593
Stockholders' equity	2,418,603		2,799,243		81,478		(2,880,721		)	2,418,603
Total liabilities and stockholders' equity	$	3,496,579	$	3,672,965	$	94,198	$	(3,202,833	)	$	4,060,909

Condensed Consolidating Financial Information Statement Of Operations

Condensed Consolidating Financial Information for the Three Months Ended March 31, 2014

	Westlake Chemical Corporation			Guarantor Subsidiaries			Non- Guarantor Subsidiaries			Eliminations			Consolidated
Statement of Operations
Net sales	$	—		$	1,020,429		$	9,117		$	(1,870	)	$	1,027,676
Cost of sales	—			734,350			8,186			(1,870		)	740,666
Gross profit	—			286,079			931			—			287,010
Selling, general and administrative    expenses	546			37,063			1,346			—			38,955
(Loss) income from operations	(546		)	249,016			(415		)	—			248,055
Interest expense	(8,947		)	(210		)	—			—			(9,157		)
Other income (expense), net	5,006			(1,883		)	(614		)	—			2,509
(Loss) income before income taxes	(4,487		)	246,923			(1,029		)	—			241,407
(Benefit from) provision for income taxes	(1,558		)	85,110			(177		)	—			83,375
Equity in net income of subsidiaries	160,961			—			—			(160,961		)	—
Net income (loss)	$	158,032		$	161,813		$	(852	)	$	(160,961	)	$	158,032
Comprehensive income (loss)	$	158,866		$	161,948		$	(1,750	)	$	(160,198	)	$	158,866

Condensed Consolidating Financial Information for the Three Months Ended March 31, 2013

	Westlake Chemical Corporation			Guarantor Subsidiaries			Non- Guarantor Subsidiaries			Eliminations			Consolidated
Statement of Operations
Net sales	$	—		$	856,085		$	10,540		$	(1,978	)	$	864,647
Cost of sales	—			629,286			9,530			(1,978		)	636,838
Gross profit	—			226,799			1,010			—			227,809
Selling, general and administrative    expenses	510			31,709			1,535			—			33,754
(Loss) income from operations	(510		)	195,090			(525		)	—			194,055
Interest expense	(6,258		)	(23		)	—			—			(6,281		)
Other income (expense), net	4,309			(290		)	(500		)	—			3,519
(Loss) income before income taxes	(2,459		)	194,777			(1,025		)	—			191,293
(Benefit from) provision for income taxes	(874		)	69,051			(231		)	—			67,946
Equity in net income of subsidiaries	124,932			—			—			(124,932		)	—
Net income (loss)	$	123,347		$	125,726		$	(794	)	$	(124,932	)	$	123,347
Comprehensive income (loss)	$	123,155		$	126,104		$	(1,364	)	$	(124,740	)	$	123,155

Condensed Consolidating Financial Information Statement Of Cash Flows

Condensed Consolidating Financial Information for the Three Months Ended March 31, 2014

	Westlake Chemical Corporation			Guarantor Subsidiaries			Non- Guarantor Subsidiaries			Eliminations			Consolidated
Statement of Cash Flows
Cash flows from operating activities
Net income (loss)	$	158,032		$	161,813		$	(852	)	$	(160,961	)	$	158,032
Adjustments to reconcile net income    (loss) to net cash (used for) provided    by operating activities
Depreciation and amortization	365			45,408			564			—			46,337
Deferred income taxes	(162		)	8,487			(50		)	—			8,275
Net changes in working capital    and other	(165,553		)	6,263			(1,810		)	160,961			(139		)
Net cash (used for) provided by    operating activities	(7,318		)	221,971			(2,148		)	—			212,505
Cash flows from investing activities
Additions to property, plant and    equipment	—			(110,559		)	(182		)	—			(110,741		)
Proceeds from disposition of assets	—			12			—			—			12
Proceeds from sales and maturities of    securities	30,119			—			—			—			30,119
Purchase of securities	(49,025		)	—			—			—			(49,025		)
Settlements of derivative instruments	—			(409		)	—			—			(409		)
Net cash used for investing    activities	(18,906		)	(110,956		)	(182		)	—			(130,044		)
Cash flows from financing activities
Intercompany financing	106,903			(109,346		)	2,443			—			—
Dividends paid	(16,789		)	—			—			—			(16,789		)
Proceeds from exercise of stock options	2,158			—			—			—			2,158
Windfall tax benefits from share-based    payment arrangements	3,512			—			—			—			3,512
Net cash provided by (used for)    financing activities	95,784			(109,346		)	2,443			—			(11,119		)
Net increase in cash and cash equivalents	69,560			1,669			113			—			71,342
Cash and cash equivalents at beginning    of period	420,948			6,227			34,126			—			461,301
Cash and cash equivalents at end of period	$	490,508		$	7,896		$	34,239		$	—		$	532,643

Condensed Consolidating Financial Information for the Three Months Ended March 31, 2013

	Westlake Chemical Corporation			Guarantor Subsidiaries			Non- Guarantor Subsidiaries			Eliminations			Consolidated
Statement of Cash Flows
Cash flows from operating activities
Net income (loss)	$	123,347		$	125,726		$	(794	)	$	(124,932	)	$	123,347
Adjustments to reconcile net income    (loss) to net cash (used for) provided    by operating activities
Depreciation and amortization	365			34,766			590			—			35,721
Deferred income taxes	(23		)	29,896			(407		)	—			29,466
Net changes in working capital    and other	(129,403		)	(68,474		)	663			124,932			(72,282		)
Net cash (used for) provided by    operating activities	(5,714		)	121,914			52			—			116,252
Cash flows from investing activities
Additions to property, plant and    equipment	—			(149,113		)	(1,671		)	—			(150,784		)
Proceeds from disposition of assets	—			—			2			—			2
Proceeds from repayment of loan    to affiliate	—			—			167			—			167
Proceeds from sales and maturities of    securities	124,873			—			—			—			124,873
Purchase of securities	(94,903		)	—			—			—			(94,903		)
Settlements of derivative instruments	—			(679		)	—			—			(679		)
Net cash provided by (used for)    investing activities	29,970			(149,792		)	(1,502		)	—			(121,324		)
Cash flows from financing activities
Intercompany financing	(28,120		)	28,553			(433		)	—			—
Dividends paid	(12,553		)	—			—			—			(12,553		)
Proceeds from exercise of stock options	1,590			—			—			—			1,590
Windfall tax benefits from share-based    payment arrangements	3,844			—			—			—			3,844
Net cash (used for) provided by    financing activities	(35,239		)	28,553			(433		)	—			(7,119		)
Net (decrease) increase in cash and    cash equivalents	(10,983		)	675			(1,883		)	—			(12,191		)
Cash and cash equivalents at beginning    of period	753,881			6,973			29,224			—			790,078
Cash and cash equivalents at end of period	$	742,898		$	7,648		$	27,341		$	—		$	777,887

XML

Guarantor Disclosures

3 Months Ended

Mar. 31, 2014

Guarantees [Abstract]

Guarantor Disclosures

Guarantor Disclosures

The Company's payment obligations under the 3.60% senior notes due 2022 are fully and unconditionally guaranteed by each of its current and future domestic subsidiaries that guarantee other debt of the Company or of another guarantor of the 3.60% senior notes due 2022 in excess of $5,000 (the "Guarantor Subsidiaries"). Each Guarantor Subsidiary is 100% owned by Westlake Chemical Corporation. These guarantees are the joint and several obligations of the Guarantor Subsidiaries. The following unaudited condensed consolidating financial information presents the financial condition, results of operations and cash flows of Westlake Chemical Corporation, the Guarantor Subsidiaries and the remaining subsidiaries that do not guarantee the 3.60% senior notes due 2022 (the "Non-Guarantor Subsidiaries"), together with consolidating eliminations necessary to present the Company's results on a consolidated basis.

Condensed Consolidating Financial Information as of March 31, 2014

	Westlake Chemical Corporation		Guarantor Subsidiaries		Non- Guarantor Subsidiaries		Eliminations			Consolidated
Balance Sheet
Current assets
Cash and cash equivalents	$	490,508	$	7,896	$	34,239	$	—		$	532,643
Marketable securities	243,694		—		—		—			243,694
Accounts receivable, net	58,050		888,829		3,381		(528,381		)	421,879
Inventories	—		422,166		16,843		—			439,009
Prepaid expenses and other    current assets	889		12,864		2,127		—			15,880
Deferred income taxes	441		33,422		295		—			34,158
Total current assets	793,582		1,365,177		56,885		(528,381		)	1,687,263
Property, plant and equipment, net	—		2,144,266		6,377		—			2,150,643
Equity investments	2,975,949		101,472		31,056		(3,040,917		)	67,560
Other assets, net	31,493		238,867		1,176		(5,046		)	266,490
Total assets	$	3,801,024	$	3,849,782	$	95,494	$	(3,574,344	)	$	4,171,956
Current liabilities
Accounts payable	$	463,650	$	193,020	$	14,351	$	(459,069	)	$	211,952
Accrued liabilities	15,782		200,781		731		(69,312		)	147,982
Total current liabilities	479,432		393,801		15,082		(528,381		)	359,934
Long-term debt	753,020		10,889		—		—			763,909
Deferred income taxes	—		451,597		652		(5,046		)	447,203
Other liabilities	—		32,308		30		—			32,338
Stockholders' equity	2,568,572		2,961,187		79,730		(3,040,917		)	2,568,572
Total liabilities and stockholders' equity	$	3,801,024	$	3,849,782	$	95,494	$	(3,574,344	)	$	4,171,956

Condensed Consolidating Financial Information as of December 31, 2013

	Westlake Chemical Corporation		Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Eliminations			Consolidated
Balance Sheet
Current assets
Cash and cash equivalents	$	420,948	$	6,227	$	34,126	$	—		$	461,301
Marketable securities	239,388		—		—		—			239,388
Accounts receivable, net	3,879		738,156		2,755		(316,333		)	428,457
Inventories	—		456,306		15,573		—			471,879
Prepaid expenses and other    current assets	778		11,312		1,798		—			13,888
Deferred income taxes	441		33,422		306		—			34,169
Total current assets	665,434		1,245,423		54,558		(316,333		)	1,649,082
Property, plant and equipment, net	—		2,081,091		6,923		—			2,088,014
Equity investments	2,815,752		100,326		31,518		(2,880,721		)	66,875
Other assets, net	15,393		246,125		1,199		(5,779		)	256,938
Total assets	$	3,496,579	$	3,672,965	$	94,198	$	(3,202,833	)	$	4,060,909
Current liabilities
Accounts payable	$	316,652	$	223,134	$	10,649	$	(300,822	)	$	249,613
Accrued liabilities	8,334		161,140		1,282		(15,511		)	155,245
Total current liabilities	324,986		384,274		11,931		(316,333		)	404,858
Long-term debt	752,990		10,889		—		—			763,879
Deferred income taxes	—		443,026		729		(5,779		)	437,976
Other liabilities	—		35,533		60		—			35,593
Stockholders' equity	2,418,603		2,799,243		81,478		(2,880,721		)	2,418,603
Total liabilities and stockholders' equity	$	3,496,579	$	3,672,965	$	94,198	$	(3,202,833	)	$	4,060,909

Condensed Consolidating Financial Information for the Three Months Ended March 31, 2014

	Westlake Chemical Corporation			Guarantor Subsidiaries			Non- Guarantor Subsidiaries			Eliminations			Consolidated
Statement of Operations
Net sales	$	—		$	1,020,429		$	9,117		$	(1,870	)	$	1,027,676
Cost of sales	—			734,350			8,186			(1,870		)	740,666
Gross profit	—			286,079			931			—			287,010
Selling, general and administrative    expenses	546			37,063			1,346			—			38,955
(Loss) income from operations	(546		)	249,016			(415		)	—			248,055
Interest expense	(8,947		)	(210		)	—			—			(9,157		)
Other income (expense), net	5,006			(1,883		)	(614		)	—			2,509
(Loss) income before income taxes	(4,487		)	246,923			(1,029		)	—			241,407
(Benefit from) provision for income taxes	(1,558		)	85,110			(177		)	—			83,375
Equity in net income of subsidiaries	160,961			—			—			(160,961		)	—
Net income (loss)	$	158,032		$	161,813		$	(852	)	$	(160,961	)	$	158,032
Comprehensive income (loss)	$	158,866		$	161,948		$	(1,750	)	$	(160,198	)	$	158,866

Condensed Consolidating Financial Information for the Three Months Ended March 31, 2013

	Westlake Chemical Corporation			Guarantor Subsidiaries			Non- Guarantor Subsidiaries			Eliminations			Consolidated
Statement of Operations
Net sales	$	—		$	856,085		$	10,540		$	(1,978	)	$	864,647
Cost of sales	—			629,286			9,530			(1,978		)	636,838
Gross profit	—			226,799			1,010			—			227,809
Selling, general and administrative    expenses	510			31,709			1,535			—			33,754
(Loss) income from operations	(510		)	195,090			(525		)	—			194,055
Interest expense	(6,258		)	(23		)	—			—			(6,281		)
Other income (expense), net	4,309			(290		)	(500		)	—			3,519
(Loss) income before income taxes	(2,459		)	194,777			(1,025		)	—			191,293
(Benefit from) provision for income taxes	(874		)	69,051			(231		)	—			67,946
Equity in net income of subsidiaries	124,932			—			—			(124,932		)	—
Net income (loss)	$	123,347		$	125,726		$	(794	)	$	(124,932	)	$	123,347
Comprehensive income (loss)	$	123,155		$	126,104		$	(1,364	)	$	(124,740	)	$	123,155

Condensed Consolidating Financial Information for the Three Months Ended March 31, 2014

	Westlake Chemical Corporation			Guarantor Subsidiaries			Non- Guarantor Subsidiaries			Eliminations			Consolidated
Statement of Cash Flows
Cash flows from operating activities
Net income (loss)	$	158,032		$	161,813		$	(852	)	$	(160,961	)	$	158,032
Adjustments to reconcile net income    (loss) to net cash (used for) provided    by operating activities
Depreciation and amortization	365			45,408			564			—			46,337
Deferred income taxes	(162		)	8,487			(50		)	—			8,275
Net changes in working capital    and other	(165,553		)	6,263			(1,810		)	160,961			(139		)
Net cash (used for) provided by    operating activities	(7,318		)	221,971			(2,148		)	—			212,505
Cash flows from investing activities
Additions to property, plant and    equipment	—			(110,559		)	(182		)	—			(110,741		)
Proceeds from disposition of assets	—			12			—			—			12
Proceeds from sales and maturities of    securities	30,119			—			—			—			30,119
Purchase of securities	(49,025		)	—			—			—			(49,025		)
Settlements of derivative instruments	—			(409		)	—			—			(409		)
Net cash used for investing    activities	(18,906		)	(110,956		)	(182		)	—			(130,044		)
Cash flows from financing activities
Intercompany financing	106,903			(109,346		)	2,443			—			—
Dividends paid	(16,789		)	—			—			—			(16,789		)
Proceeds from exercise of stock options	2,158			—			—			—			2,158
Windfall tax benefits from share-based    payment arrangements	3,512			—			—			—			3,512
Net cash provided by (used for)    financing activities	95,784			(109,346		)	2,443			—			(11,119		)
Net increase in cash and cash equivalents	69,560			1,669			113			—			71,342
Cash and cash equivalents at beginning    of period	420,948			6,227			34,126			—			461,301
Cash and cash equivalents at end of period	$	490,508		$	7,896		$	34,239		$	—		$	532,643

Condensed Consolidating Financial Information for the Three Months Ended March 31, 2013

	Westlake Chemical Corporation			Guarantor Subsidiaries			Non- Guarantor Subsidiaries			Eliminations			Consolidated
Statement of Cash Flows
Cash flows from operating activities
Net income (loss)	$	123,347		$	125,726		$	(794	)	$	(124,932	)	$	123,347
Adjustments to reconcile net income    (loss) to net cash (used for) provided    by operating activities
Depreciation and amortization	365			34,766			590			—			35,721
Deferred income taxes	(23		)	29,896			(407		)	—			29,466
Net changes in working capital    and other	(129,403		)	(68,474		)	663			124,932			(72,282		)
Net cash (used for) provided by    operating activities	(5,714		)	121,914			52			—			116,252
Cash flows from investing activities
Additions to property, plant and    equipment	—			(149,113		)	(1,671		)	—			(150,784		)
Proceeds from disposition of assets	—			—			2			—			2
Proceeds from repayment of loan    to affiliate	—			—			167			—			167
Proceeds from sales and maturities of    securities	124,873			—			—			—			124,873
Purchase of securities	(94,903		)	—			—			—			(94,903		)
Settlements of derivative instruments	—			(679		)	—			—			(679		)
Net cash provided by (used for)    investing activities	29,970			(149,792		)	(1,502		)	—			(121,324		)
Cash flows from financing activities
Intercompany financing	(28,120		)	28,553			(433		)	—			—
Dividends paid	(12,553		)	—			—			—			(12,553		)
Proceeds from exercise of stock options	1,590			—			—			—			1,590
Windfall tax benefits from share-based    payment arrangements	3,844			—			—			—			3,844
Net cash (used for) provided by    financing activities	(35,239		)	28,553			(433		)	—			(7,119		)
Net (decrease) increase in cash and    cash equivalents	(10,983		)	675			(1,883		)	—			(12,191		)
Cash and cash equivalents at beginning    of period	753,881			6,973			29,224			—			790,078
Cash and cash equivalents at end of period	$	742,898		$	7,648		$	27,341		$	—		$	777,887

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Guarantor Disclosures (Condensed Consolidating Financial Information Balance Sheets) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	$ 532,643	$ 461,301	$ 777,887	$ 790,078
Marketable Securities, Current	243,694	239,388
Accounts receivable, net	421,879	428,457
Inventories	439,009	471,879
Prepaid expenses and other current assets	15,880	13,888
Deferred income taxes	34,158	34,169
Total current assets	1,687,263	1,649,082
Property, plant and equipment, net	2,150,643	2,088,014
Equity investments	67,560	66,875
Other assets, net	266,490	256,938
Total assets	4,171,956	4,060,909
Accounts payable	211,952	249,613
Accrued liabilities	147,982	155,245
Total current liabilities	359,934	404,858
Long-term debt	763,909	763,879
Deferred income taxes	447,203	437,976
Other liabilities	32,338	35,593
Stockholders' equity	2,568,572	2,418,603
Total liabilities and stockholders' equity	4,171,956	4,060,909
Westlake Chemical Corporation
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	490,508	420,948	742,898	753,881
Marketable Securities, Current	243,694	239,388
Accounts receivable, net	58,050	3,879
Inventories	0	0
Prepaid expenses and other current assets	889	778
Deferred income taxes	441	441
Total current assets	793,582	665,434
Property, plant and equipment, net	0	0
Equity investments	2,975,949	2,815,752
Other assets, net	31,493	15,393
Total assets	3,801,024	3,496,579
Accounts payable	463,650	316,652
Accrued liabilities	15,782	8,334
Total current liabilities	479,432	324,986
Long-term debt	753,020	752,990
Deferred income taxes	0	0
Other liabilities	0	0
Stockholders' equity	2,568,572	2,418,603
Total liabilities and stockholders' equity	3,801,024	3,496,579
Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	7,896	6,227	7,648	6,973
Marketable Securities, Current	0	0
Accounts receivable, net	888,829	738,156
Inventories	422,166	456,306
Prepaid expenses and other current assets	12,864	11,312
Deferred income taxes	33,422	33,422
Total current assets	1,365,177	1,245,423
Property, plant and equipment, net	2,144,266	2,081,091
Equity investments	101,472	100,326
Other assets, net	238,867	246,125
Total assets	3,849,782	3,672,965
Accounts payable	193,020	223,134
Accrued liabilities	200,781	161,140
Total current liabilities	393,801	384,274
Long-term debt	10,889	10,889
Deferred income taxes	451,597	443,026
Other liabilities	32,308	35,533
Stockholders' equity	2,961,187	2,799,243
Total liabilities and stockholders' equity	3,849,782	3,672,965
Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	34,239	34,126	27,341	29,224
Marketable Securities, Current	0	0
Accounts receivable, net	3,381	2,755
Inventories	16,843	15,573
Prepaid expenses and other current assets	2,127	1,798
Deferred income taxes	295	306
Total current assets	56,885	54,558
Property, plant and equipment, net	6,377	6,923
Equity investments	31,056	31,518
Other assets, net	1,176	1,199
Total assets	95,494	94,198
Accounts payable	14,351	10,649
Accrued liabilities	731	1,282
Total current liabilities	15,082	11,931
Long-term debt	0	0
Deferred income taxes	652	729
Other liabilities	30	60
Stockholders' equity	79,730	81,478
Total liabilities and stockholders' equity	95,494	94,198
Eliminations
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	0	0	0	0
Marketable Securities, Current	0	0
Accounts receivable, net	(528,381)	(316,333)
Inventories	0	0
Prepaid expenses and other current assets	0	0
Deferred income taxes	0	0
Total current assets	(528,381)	(316,333)
Property, plant and equipment, net	0	0
Equity investments	(3,040,917)	(2,880,721)
Other assets, net	(5,046)	(5,779)
Total assets	(3,574,344)	(3,202,833)
Accounts payable	(459,069)	(300,822)
Accrued liabilities	(69,312)	(15,511)
Total current liabilities	(528,381)	(316,333)
Long-term debt	0	0
Deferred income taxes	(5,046)	(5,779)
Other liabilities	0	0
Stockholders' equity	(3,040,917)	(2,880,721)
Total liabilities and stockholders' equity	$ (3,574,344)	$ (3,202,833)

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Basis of Financial Statements

3 Months Ended

Mar. 31, 2014

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Financial Statements

Basis of Financial Statements

The accompanying unaudited consolidated interim financial statements were prepared in accordance with the rules and regulations of the Securities and Exchange Commission (the "SEC") for interim periods. Accordingly, certain information and footnotes required for complete financial statements under generally accepted accounting principles in the United States ("U.S. GAAP") have not been included. These interim consolidated financial statements should be read in conjunction with the December 31, 2013 financial statements and notes thereto of Westlake Chemical Corporation (the "Company") included in the annual report on Form 10-K for the fiscal year ended December 31, 2013 (the "2013 Form 10-K"), filed with the SEC on February 21, 2014. These financial statements have been prepared in conformity with the accounting principles and practices as disclosed in the notes to the consolidated financial statements of the Company for the fiscal year ended December 31, 2013.

In the opinion of the Company's management, the accompanying unaudited consolidated interim financial statements reflect all adjustments (consisting only of normal recurring adjustments) that are necessary for a fair statement of the Company's financial position as of March 31, 2014, its results of operations for the three months ended March 31, 2014 and 2013 and the changes in its cash position for the three months ended March 31, 2014 and 2013.

Results of operations and changes in cash position for the interim periods presented are not necessarily indicative of the results that will be realized for the fiscal year ending December 31, 2014 or any other interim period. The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses and the disclosure of contingent assets and liabilities. Actual results could differ from those estimates.

On February 14, 2014, the Company's Board of Directors authorized a two-for-one split of the Company's common stock. Stockholders of record as of February 28, 2014 were entitled to one additional share for every share outstanding, which was distributed on March 18, 2014. The total number of authorized common stock shares and associated par value were unchanged by this stock split. All share amounts and per share data included in the accompanying consolidated financial statements and related notes have been restated to reflect the effect of the stock split.

Recent Accounting Pronouncements

There are no recently issued accounting standards which are expected to impact the Company's consolidated financial position, results of operations or cash flows.

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Consolidated Balance Sheets (Parenthetical) (USD $)	Mar. 31, 2014	Dec. 31, 2013
Statement of Financial Position [Abstract]
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	50,000,000	50,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	150,000,000	150,000,000
Common stock, shares issued	134,682,004	134,580,208
Common stock, held in treasury	1,252,922	1,252,922

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Income Taxes

3 Months Ended

Mar. 31, 2014

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes

The effective income tax rate was 34.5% for the three months ended March 31, 2014. The effective income tax rate for the 2014 period was below the U.S. federal statutory rate of 35.0% primarily due to state tax credits and the domestic manufacturing deduction, mostly offset by state income taxes. The effective income tax rate was 35.5% for the three months ended March 31, 2013. The effective income tax rate for the 2013 period was above the U.S. federal statutory rate of 35.0% primarily due to state income taxes, partially offset by the domestic manufacturing deduction.

There was no material change to the total gross unrecognized tax benefits for the three months ended March 31, 2014. Management anticipates that all of the gross unrecognized tax benefits of $2,501 will be recognized within the next twelve months due to expiring statutes of limitations. The impact from the recognition of these tax benefits on the Company's effective tax rate is expected to be immaterial.

The Company recognizes penalties and interest accrued related to unrecognized tax benefits in income tax expense. As of March 31, 2014, the Company had no material accrued interest and penalties related to uncertain tax positions.

The Company files income tax returns in the U.S. federal jurisdiction, various states and foreign jurisdictions. The Company is no longer subject to examinations by tax authorities before the year 2007.

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Document and Entity Information	3 Months Ended
	Mar. 31, 2014	Apr. 29, 2014
Document Documentand Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2014
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	Q1
Trading Symbol	WLK
Entity Registrant Name	WESTLAKE CHEMICAL CORP
Entity Central Index Key	0001262823
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		133,429,082

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Earnings per Share

3 Months Ended

Mar. 31, 2014

Earnings Per Share [Abstract]

Earnings per Share

Earnings per Share

The Company has unvested shares of restricted stock and restricted stock units outstanding that are considered participating securities and, therefore, computes basic and diluted earnings per share under the two-class method. Basic earnings per share for the periods are based upon the weighted average number of shares of common stock outstanding during the periods. Diluted earnings per share include the effect of certain stock options.

	Three Months Ended March 31,
	2014			2013
Net income	$	158,032		$	123,347
Less:
Net income attributable to participating securities	(384		)	(568		)
Net income attributable to common shareholders	$	157,648		$	122,779

The following table reconciles the denominator for the basic and diluted earnings per share computations shown in the consolidated statements of operations:

	Three Months Ended March 31,
	2014		2013
Weighted average common shares—basic (1)	133,072,254		133,251,071
Plus incremental shares from:
Assumed exercise of options (1)	540,670		566,666
Weighted average common shares—diluted (1)	133,612,924		133,817,737
Earnings per share: (1)
Basic	$	1.18	$	0.92
Diluted	$	1.18	$	0.92

_____________

(1) Share amounts and per share data for the three months ended March 31, 2013 have been restated to reflect the effect of a two-for-one stock split on March 18, 2014. See Note 1 for additional information.

Excluded from the computation of diluted earnings per share are options to purchase 69,662 and 72,776 shares of common stock for the three months ended March 31, 2014 and 2013, respectively. These options were outstanding during the periods reported but were excluded because the effect of including them would have been antidilutive.

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Consolidated Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Income Statement [Abstract]
Net sales	$ 1,027,676		$ 864,647
Cost of sales	740,666		636,838
Gross profit	287,010		227,809
Selling, general and administrative expenses	38,955		33,754
Income from operations	248,055		194,055
Other income (expense)
Interest expense	(9,157)		(6,281)
Other (expense) income, net	2,509		3,519
Income before income taxes	241,407		191,293
Provision for income taxes	83,375		67,946
Net income	$ 158,032		$ 123,347
Earnings per share:
Basic	$ 1.18	[1]	$ 0.92	[1]
Diluted	$ 1.18	[1]	$ 0.92	[1]
Weighted average shares outstanding:
Basic	133,072,254	[1]	133,251,071	[1]
Diluted	133,612,924	[1]	133,817,737	[1]
Dividends per common share	$ 0.1260		$ 0.0938

[1] Share amounts and per share data for the three months ended March 31, 2013 have been restated to reflect the effect of a two-for-one stock split on March 18, 2014. See Note 1 for additional information.

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Other Assets

3 Months Ended

Mar. 31, 2014

Other Assets [Abstract]

Other Assets

Other Assets

Goodwill for the Olefins segment was $29,990 at March 31, 2014 and December 31, 2013. Goodwill for the Vinyls segment was $32,026 at March 31, 2014 and December 31, 2013. There were no changes in the carrying amount of goodwill by operating segments for the three months ended March 31, 2014.

Amortization expense on intangible and other assets of $8,276 and $4,801 is included in the consolidated statements of operations for the three months ended March 31, 2014 and 2013, respectively.

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Property, Plant and Equipment

3 Months Ended

Mar. 31, 2014

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

Property, Plant and Equipment

As of March 31, 2014, the Company had property, plant and equipment, net totaling $2,150,643. The Company assesses these assets for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable, including when negative conditions such as significant current or projected operating losses exist. Other factors considered by the Company when determining if an impairment assessment is necessary include, but are not limited to, significant changes or projected changes in supply and demand fundamentals (which would have a negative impact on operating rates or margins), new technological developments, new competitors with significant raw material or other cost advantages, adverse changes associated with the U.S. and world economies and uncertainties associated with governmental actions. Long-lived assets assessed for impairment are grouped at the lowest level for which identifiable cash flows are largely independent of the cash flows of other assets and liabilities.

Depreciation expense on property, plant and equipment of $38,061 and $30,920 is included in cost of sales in the consolidated statements of operations for the three months ended March 31, 2014 and 2013, respectively.

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Subsequent Events

3 Months Ended

Mar. 31, 2014

Subsequent Events [Abstract]

Subsequent Events

Subsequent Events

Subsequent events were evaluated through the date on which the financial statements were issued.

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Pension and Post-Retirement Benefit Costs

3 Months Ended

Mar. 31, 2014

Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]

Pension and Post-Retirement Benefit Costs

Pension and Post-Retirement Benefit Costs

Components of net periodic benefit cost are as follows:

	Three Months Ended March 31,
	Pension						Post-retirement Healthcare
	2014			2013			2014		2013
Service cost	$	84		$	264		$	5	$	2
Interest cost	595			501			181		147
Expected return on plan assets	(809		)	(714		)	—		—
Amortization of prior service cost	74			74			13		21
Amortization of net loss	63			429			69		90
Net periodic benefit cost	$	7		$	554		$	268	$	260

The Company contributed $388 to the Salaried pension plan in the first three months of 2014, and contributed $290 and $60 to the Wage pension plan in the first three months of 2014 and 2013, respectively. The Company did not contribute to the Salaried pension plan in the first three months of 2013. The Company expects to make additional contributions of $2,389 to the Salaried pension plan and $916 to the Wage pension plan during the fiscal year ending December 31, 2014.

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Derivative Instruments

3 Months Ended

Mar. 31, 2014

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Instruments

Derivative Instruments

Commodity Risk Management

The Company uses derivative instruments to reduce price volatility risk on raw materials and products as a substantial portion of its raw materials and products are commodities whose prices fluctuate as market supply and demand fundamentals change. Business strategies to protect against such instability include ethylene product feedstock flexibility and moving downstream into the olefins and vinyls products where pricing is more stable. The Company does not use derivative instruments to engage in speculative activities.

For derivative instruments that are designated and qualify as fair value hedges, the gains or losses on the derivative instruments, as well as the offsetting losses or gains on the hedged items attributable to the hedged risk, were included in cost of sales in the consolidated statement of operations for the three months ended March 31, 2013. The Company had no derivative instruments that were designated as fair value hedges for the three months ended March 31, 2014.

Gains and losses from changes in the fair value of derivative instruments that are not designated as hedging instruments were included in gross profit in the consolidated statements of operations for the three months ended March 31, 2014 and 2013.

The exposure on commodity derivatives used for price risk management includes the risk that the counterparty will not pay if the market declines below the established fixed price. In such case, the Company would lose the benefit of the derivative differential on the volume of the commodities covered. In any event, the Company would continue to receive the market price on the actual volume hedged. The Company also bears the risk that it could lose the benefit of market improvements over the fixed derivative price for the term and volume of the derivative instruments (as such improvements would accrue to the benefit of the counterparty).

Disclosures related to the Company's derivative assets and derivative liabilities subject to enforceable master netting arrangements have not been presented as they are not material to the Company's consolidated balance sheets at March 31, 2014 and December 31, 2013.

The fair values of derivative instruments in the Company's consolidated balance sheets were as follows:

	Derivative Assets
	Balance Sheet Location	Fair Value as of
		March 31, 2014		December 31, 2013
Not designated as hedging instruments
Commodity forward contracts	Accounts receivable, net	$	248	$	296
Total derivative assets		$	248	$	296

	Derivative Liabilities
	Balance Sheet Location	Fair Value as of
		March 31, 2014		December 31, 2013
Not designated as hedging instruments
Commodity forward contracts	Accrued liabilities	$	54	$	176
Total derivative liabilities		$	54	$	176

The following tables reflect the impact of derivative instruments designated as fair value hedges and the related hedged item on the Company's consolidated statements of operations. For the three months ended March 31, 2013, there was no material ineffectiveness with regard to the Company's qualifying fair value hedges.

Derivatives in Fair Value    Hedging Relationships	Location of Gain (Loss) Recognized in  Income on Derivative	Three Months Ended March 31,
		2014		2013
Commodity forward contracts	Cost of sales	$	—	$	(1,643	)
Hedged Items in Fair Value    Hedging Relationships	Location of Gain (Loss) Recognized in  Income on Hedged Items	Three Months Ended March 31,
		2014		2013
Firm commitment designated as the hedged item	Cost of sales	$	—	$	1,395

The impact of derivative instruments that have not been designated as hedges on the Company's consolidated statements of operations were as follows:

Derivatives Not Designated as    Hedging Instruments	Location of Gain (Loss) Recognized in  Income on Derivative	Three Months Ended March 31,
		2014			2013
Commodity forward contracts	Gross profit	$	(611	)	$	7,335

See Note 10 for the fair value of the Company's derivative instruments.

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Accumulated Other Comprehensive Income Changes in AOCI (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), beginning balance	$ (2,616)	$ (10,840)
Other comprehensive loss before reclassifications	683	(570)
Amounts reclassified from accumulated other comprehensive loss	151	378
Net other comprehensive income (loss) for the period	834	(192)
Accumulated other comprehensive income (loss), ending balance	(1,782)	(11,032)
Benefits Liability, Net of Tax
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), beginning balance	(6,696)	(16,351)
Other comprehensive loss before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive loss	135	378
Net other comprehensive income (loss) for the period	135	378
Accumulated other comprehensive income (loss), ending balance	(6,561)	(15,973)
Cumulative Foreign Currency Exchange
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), beginning balance	3,904	5,511
Other comprehensive loss before reclassifications	(898)	(570)
Amounts reclassified from accumulated other comprehensive loss	0	0
Net other comprehensive income (loss) for the period	(898)	(570)
Accumulated other comprehensive income (loss), ending balance	3,006	4,941
Net Unrealized Holding Gains on Investmetnts, Net of Tax
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), beginning balance	176
Other comprehensive loss before reclassifications	1,581
Amounts reclassified from accumulated other comprehensive loss	16
Net other comprehensive income (loss) for the period	1,597
Accumulated other comprehensive income (loss), ending balance	$ 1,773

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Long-Term Debt

3 Months Ended

Mar. 31, 2014

Debt Disclosure [Abstract]

Long-Term Debt

Long-Term Debt

Long-term debt consists of the following:

	March 31, 2014		December 31, 2013
3.60% senior notes due 2022	$	249,020	$	248,990
6 ½% senior notes due 2029	100,000		100,000
6 ¾% senior notes due 2032	250,000		250,000
6 ½% senior notes due 2035 (the "6 ½% GO Zone Senior Notes Due 2035")	89,000		89,000
6 ½% senior notes due 2035 (the "6 ½% IKE Zone Senior Notes Due 2035")	65,000		65,000
Loan related to tax-exempt waste disposal revenue bonds due 2027	10,889		10,889
Long-term debt, net	$	763,909	$	763,879

Revolving Credit Facility

The Company has a $400,000 senior secured revolving credit facility. The facility includes a provision permitting the Company to increase the size of the facility, up to four times, in increments of at least $25,000 each (up to a maximum of $150,000) under certain circumstances if lenders agree to commit to such an increase. At March 31, 2014, the Company had no borrowings outstanding under the revolving credit facility. Any borrowings under the facility will bear interest at either LIBOR plus a spread ranging from 1.75% to 2.25% or a base rate plus a spread ranging from 0.25% to 0.75%. The revolving credit facility also requires an unused commitment fee of 0.375% per annum. All interest rates under the facility are subject to monthly grid pricing adjustments based on prior month average daily loan availability. The revolving credit facility matures on September 16, 2016. As of March 31, 2014, the Company had outstanding letters of credit totaling $16,921 and borrowing availability of $383,079 under the revolving credit facility.

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Stock-Based Compensation

3 Months Ended

Mar. 31, 2014

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock-Based Compensation

Stock-Based Compensation

Under the Westlake Chemical Corporation 2013 Omnibus Incentive Plan (as amended and restated, the "2013 Plan"), all employees and nonemployee directors of the Company, as well as certain individuals who have agreed to become the Company's employees, are eligible for awards. Shares of common stock may be issued as authorized in the 2013 Plan. At the discretion of the administrator of the 2013 Plan, employees and nonemployee directors may be granted awards in the form of stock options, stock appreciation rights, stock awards, restricted stock units or cash awards (any of which may be a performance award). Total stock-based compensation expense related to the 2013 Plan was $2,222 and $1,499 for the three months ended March 31, 2014 and 2013, respectively.

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Fair Value Measurements

3 Months Ended

Mar. 31, 2014

Fair Value Disclosures [Abstract]

Fair Value Measurements

Fair Value Measurements

The Company reports certain assets and liabilities at fair value, which is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date (exit price). Under the accounting guidance for fair value measurements, inputs used to measure fair value are classified in one of three levels:

Level 1: Quoted market prices in active markets for identical assets or liabilities.

Level 2: Observable market-based inputs or unobservable inputs that are corroborated by market data.

Level 3: Unobservable inputs that are not corroborated by market data.

The following tables summarize, by level within the fair value hierarchy, the Company's assets and liabilities that were accounted for at fair value on a recurring basis:

	March 31, 2014
	Level 1		Level 2			Total
Derivative instruments
Risk management assets - Commodity forward contracts	$	—	$	248		$	248
Risk management liabilities - Commodity forward contracts	—		(54		)	(54		)
Available-for-sale marketable securities	100,603		160,286			260,889
	December 31, 2013
	Level 1		Level 2			Total
Derivative instruments
Risk management assets - Commodity forward contracts	$	48	$	248		$	296
Risk management liabilities - Commodity forward contracts	—		(176		)	(176		)
Available-for-sale marketable securities	91,595		147,793			239,388

The Level 2 measurements for the Company's commodity contracts are derived using forward curves supplied by industry-recognized and unrelated third-party services. The Level 2 measurements for the Company's available-for-sale securities are derived using market-based pricing provided by unrelated third-party services.

There were no transfers in or out of Levels 1 and 2 of the fair value hierarchy for the three months ended March 31, 2014 and 2013.

In addition to the financial assets and liabilities above, the Company has other financial assets and liabilities subject to fair value measures. These financial assets and liabilities include cash and cash equivalents, accounts receivable, net, accounts payable and long-term debt, all of which are recorded at carrying value. The amounts reported in the consolidated balance sheets for cash and cash equivalents, accounts receivable, net and accounts payable approximate their fair value due to the short maturities of these instruments. The carrying and fair values of the Company's long-term debt are summarized in the table below. The Company's long-term debt instruments are publicly-traded. A market approach, based upon quotes from financial reporting services, is used to measure the fair value of the Company's long-term debt. Because the Company's long-term debt instruments may not be actively traded, the inputs used to measure the fair value of the Company's long-term debt are classified as Level 2 inputs within the fair value hierarchy.

	March 31, 2014				December 31, 2013
	Carrying Value		Fair Value		Carrying Value		Fair Value
3.60% senior notes due 2022	$	249,020	$	242,600	$	248,990	$	236,905
6 ½% senior notes due 2029	100,000		113,000		100,000		109,490
6 ¾% senior notes due 2032	250,000		281,775		250,000		265,148
6 ½% GO Zone Senior Notes Due 2035	89,000		101,238		89,000		94,606
6 ½% IKE Zone Senior Notes Due 2035	65,000		73,938		65,000		69,094
Loan related to tax-exempt waste disposal revenue    bonds due 2027	10,889		10,889		10,889		10,889

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Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Segment Reporting Information [Line Items]
Net external sales	$ 1,027,676	$ 864,647
Income (loss) from operations	248,055	194,055
Depreciation and amortization	45,972	35,356
Other (expense) income, net	2,509	3,519
Provision for (benefit from) income taxes	83,375	67,946
Capital expenditures	110,741	150,784
Olefins
Segment Reporting Information [Line Items]
Net external sales	722,798	582,845
Income (loss) from operations	272,333	161,058
Depreciation and amortization	26,647	23,346
Other (expense) income, net	1,454	4,010
Provision for (benefit from) income taxes	93,550	55,477
Capital expenditures	29,074	50,040
Vinyls
Segment Reporting Information [Line Items]
Net external sales	304,878	281,802
Income (loss) from operations	(21,114)	43,663
Depreciation and amortization	19,168	11,884
Other (expense) income, net	(34)	(425)
Provision for (benefit from) income taxes	(10,070)	13,720
Capital expenditures	81,120	100,317
Corporate and Other
Segment Reporting Information [Line Items]
Income (loss) from operations	(3,164)	(10,666)
Depreciation and amortization	157	126
Other (expense) income, net	1,089	(66)
Provision for (benefit from) income taxes	(105)	(1,251)
Capital expenditures	547	427
Polyethylene | Olefins
Segment Reporting Information [Line Items]
Net external sales	487,144	420,768
Ethylene, Styrene And Other | Olefins
Segment Reporting Information [Line Items]
Net external sales	235,654	162,077
PVC, Caustic Soda And Other | Vinyls
Segment Reporting Information [Line Items]
Net external sales	190,527	195,246
Building Products | Vinyls
Segment Reporting Information [Line Items]
Net external sales	114,351	86,556
Intersegment sales
Segment Reporting Information [Line Items]
Net external sales	57,196	70,547
Intersegment sales | Olefins
Segment Reporting Information [Line Items]
Net external sales	56,853	70,283
Intersegment sales | Vinyls
Segment Reporting Information [Line Items]
Net external sales	$ 343	$ 264

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Segment Information (Total Assets) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 4,171,956	$ 4,060,909
Olefins
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	1,556,856	1,557,510
Vinyls
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	1,768,572	1,740,595
Corporate and Other
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 846,528	$ 762,804

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Segment Information (Additional Information) (Detail)	3 Months Ended
	Mar. 31, 2014 Segment
Segment Reporting [Abstract]
Number of segments	2

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Accumulated Other Comprehensive Income (Tables)

3 Months Ended

Mar. 31, 2014

Equity [Abstract]

Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]

Changes in accumulated other comprehensive income (loss) by component for the three months ended March 31, 2014 and 2013 were as follows:

	Benefits Liability, Net of Tax			Cumulative Foreign Currency Exchange			Net Unrealized Holding Gains on Investments, Net of Tax		Total
Balances at December 31, 2013	$	(6,696	)	$	3,904		$	176	$	(2,616	)
Other comprehensive (loss) income before    reclassifications	—			(898		)	1,581		683
Amounts reclassified from accumulated other    comprehensive loss	135			—			16		151
Net other comprehensive income (loss) for the period	135			(898		)	1,597		834
Balances at March 31, 2014	$	(6,561	)	$	3,006		$	1,773	$	(1,782	)

Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]

The following table provides the details of the amounts reclassified from accumulated other comprehensive income (loss) into net income in the consolidated statements of operations for the three months ended March 31, 2014 and 2013:

Details about Accumulated Other Comprehensive    Income (Loss) Components	Location of Reclassification (Income (Expense)) in Consolidated Statements of Operations	Three Months Ended March 31,
		2014			2013
Amortization of pension and other post-retirement items
Prior service costs	(1)	$	(87	)	$	(95	)
Net loss	(1)	(132		)	(519		)
		(219		)	(614		)
	Provision for income taxes	84			236
		(135		)	(378		)
Net unrealized gains on available-for-sale investments
Realized loss on available-for-sale investments	Other income, net	(25		)	—
	Provision for income taxes	9			—
		(16		)	—
Total reclassifications for the period		$	(151	)	$	(378	)

_____________

(1) These accumulated other comprehensive loss components are included in the computation of net periodic benefit cost. For additional information, please read Note 10 (Employee Benefits) to the financial statements included in the 2013 Form 10-K.

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Derivative Instruments (Impact of Derivative Instruments on Income) (Details) (Cost of Sales, USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Designated As Fair Value Hedges | Firm Commitment Derivative Items Designated As Hedged Item
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivative	$ 0	$ 1,395
Designated As Fair Value Hedges | Forward Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivative	0	(1,643)
Derivatives Not Designated As Hedging Instruments | Forward Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivative	$ (611)	$ 7,335

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Commitments and Contingencies

3 Months Ended

Mar. 31, 2014

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Commitments and Contingencies

The Company is subject to environmental laws and regulations that can impose civil and criminal sanctions and that may require it to mitigate the effects of contamination caused by the release or disposal of hazardous substances into the environment. Under one law, the U.S. Comprehensive Environmental Response, Compensation, and Liability Act ("CERCLA"), an owner or operator of property may be held strictly liable for remediating contamination without regard to whether that person caused the contamination, and without regard to whether the practices that resulted in the contamination were legal at the time they occurred. Because several of the Company's production sites have a history of industrial use, it is impossible to predict precisely what effect these legal requirements will have on the Company.

Contract Disputes with Goodrich and PolyOne. In connection with the 1990 and 1997 acquisitions of the Goodrich Corporation ("Goodrich") chemical manufacturing complex in Calvert City, Kentucky, Goodrich agreed to indemnify the Company for any liabilities related to preexisting contamination at the complex. For its part, the Company agreed to indemnify Goodrich for post-closing contamination caused by the Company's operations. The soil and groundwater at the complex, which does not include the Company's nearby polyvinyl chloride ("PVC") facility, had been extensively contaminated under Goodrich's operations. In 1993, Goodrich spun off the predecessor of PolyOne Corporation ("PolyOne"), and that predecessor assumed Goodrich's indemnification obligations relating to preexisting contamination.

In 2003, litigation arose among the Company, Goodrich and PolyOne with respect to the allocation of the cost of remediating contamination at the site. The parties settled this litigation in December 2007 and the case was dismissed. In the settlement the parties agreed that, among other things: (1) PolyOne would pay 100% of the costs (with specified exceptions), net of recoveries or credits from third parties, incurred with respect to environmental issues at the Calvert City site from August 1, 2007 forward; (2) either the Company or PolyOne might, from time to time in the future (but not more than once every five years), institute an arbitration proceeding to adjust that percentage; and (3) the Company and PolyOne would negotiate a new environmental remediation utilities and services agreement to cover the Company's provision to, or on behalf of, PolyOne of certain environmental remediation services at the site. The current environmental remediation activities at the Calvert City complex do not have a specified termination date but are expected to last for the foreseeable future. The costs incurred by the Company that have been invoiced to PolyOne to provide the environmental remediation services were $3,284 in 2013. By letter dated March 16, 2010, PolyOne notified the Company that it was initiating an arbitration proceeding under the settlement agreement. In this proceeding, PolyOne seeks to readjust the percentage allocation of costs and to recover approximately $1,400 from the Company in reimbursement of previously paid remediation costs. The arbitration is currently stayed.

State Administrative Proceedings. There are several administrative proceedings in Kentucky involving the Company, Goodrich and PolyOne related to the same manufacturing complex in Calvert City. In 2003, the Kentucky Environmental and Public Protection Cabinet (the "Cabinet") re-issued Goodrich's Resource Conservation and Recovery Act ("RCRA") permit which requires Goodrich to remediate contamination at the Calvert City manufacturing complex. Both Goodrich and PolyOne challenged various terms of the permit in an attempt to shift Goodrich's clean-up obligations under the permit to the Company. The Company intervened in the proceedings. The Cabinet has suspended all corrective action under the RCRA permit in deference to a remedial investigation and feasibility study ("RIFS") being conducted, under the auspices of the U.S. Environmental Protection Agency ("EPA"), pursuant to an Administrative Settlement Agreement ("AOC"), which became effective on December 9, 2009. See "Federal Administrative Proceedings" below. The proceedings have been postponed. Periodic status conferences will be held to evaluate whether additional proceedings will be required.

Federal Administrative Proceedings. In May 2009, the Cabinet sent a letter to the EPA requesting the EPA's assistance in addressing contamination at the Calvert City site under CERCLA. In its response to the Cabinet also in May 2009, the EPA stated that it concurred with the Cabinet's request and would incorporate work previously conducted under the Cabinet's RCRA authority into the EPA's cleanup efforts under CERCLA. Since 1983, the EPA has been addressing contamination at an abandoned landfill adjacent to the Company's plant which had been operated by Goodrich and which was being remediated pursuant to CERCLA. During the past three years, the EPA has directed Goodrich and PolyOne to conduct additional investigation activities at the landfill and at the Company's plant. In June 2009, the EPA notified the Company that the Company may have potential liability under section 107(a) of CERCLA at its plant site. Liability under section 107(a) of CERCLA is strict and joint and several. The EPA also identified Goodrich and PolyOne, among others, as potentially responsible parties at the plant site. The Company negotiated, in conjunction with the other potentially responsible parties, the AOC and an order to conduct the RIFS. On July 12, 2013, the parties submitted separate draft RIFS reports to the EPA. The EPA has hired a contractor to complete the remedial investigation report.

Monetary Relief. Except as noted above with respect to the settlement of the contract litigation among the Company, Goodrich and PolyOne, none of the court, the Cabinet nor the EPA has established any allocation of the costs of remediation among the various parties that are involved in the judicial and administrative proceedings discussed above. At this time, the Company is not able to estimate the loss or reasonable possible loss, if any, on the Company's financial statements that could result from the resolution of these proceedings. Any cash expenditures that the Company might incur in the future with respect to the remediation of contamination at the complex would likely be spread out over an extended period. As a result, the Company believes it is unlikely that any remediation costs allocable to it will be material in terms of expenditures made in any individual reporting period.

In addition to the matters described above, the Company is involved in various routine legal proceedings incidental to the conduct of its business. The Company does not believe that any of these routine legal proceedings will have a material adverse effect on its financial condition, results of operations or cash flows.

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Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2014

Mar. 31, 2013

Investments, Debt and Equity Securities [Abstract]

Marketable Securities

Investments in available-for-sale securities were classified as follows:

	March 31, 2014		December 31, 2013
Current	$	243,694	$	239,388
Non-current	17,195		—
Total available-for-sale securities	$	260,889	$	239,388

Available-for-sale Securities

The cost, gross unrealized gains, gross unrealized losses and fair value of the Company’s available-for-sale securities were as follows:

	March 31, 2014
	Cost		Gross Unrealized Gains		Gross Unrealized Losses (1)			Fair Value
Debt securities
Corporate bonds	$	116,669	$	470	$	(41	)	$	117,098
U.S. government debt (2)	102,201		133		(46		)	102,288
Asset-backed securities	24,268		47		(7		)	24,308
Equity securities	14,985		2,210		—			17,195
Total available-for-sale securities	$	258,123	$	2,860	$	(94	)	$	260,889

	December 31, 2013
	Cost		Gross Unrealized Gains		Gross Unrealized Losses (1)			Fair Value
Debt securities
Corporate bonds	$	108,300	$	340	$	(69	)	$	108,571
U.S. government debt (2)	106,335		60		(79		)	106,316
Asset-backed securities	24,478		34		(11		)	24,501
Total available-for-sale securities	$	239,113	$	434	$	(159	)	$	239,388

_____________

(1) All unrealized loss positions were held at a loss for less than 12 months.

(2) U.S. Treasury obligations, U.S. government agency obligations and U.S government agency mortgage-backed securities.

Schedule of Realized Gain (Loss)

	Three Months Ended March 31,
	2014
Proceeds from sales and maturities of securities	$	30,119
Gross realized gains	13
Gross realized losses	(38		)

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Derivative Instruments (Textual) (Detail) (Commodity Forward Contracts [Member], Designated As Fair Value Hedges)	Mar. 31, 2014 customer
Commodity Forward Contracts [Member] | Designated As Fair Value Hedges
Derivative [Line Items]
Derivative, Number of Instruments Held	0

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Financial Instruments Maturity Periods for Investments (Details)	3 Months Ended
	Mar. 31, 2014
Corporate bonds | Minimum
Schedule of Available-for-sale Securities [Line Items]
Investment maturity period	1 month
Corporate bonds | Maximum
Schedule of Available-for-sale Securities [Line Items]
Investment maturity period	5 years
US Government Agencies Debt Securities [Member] | Minimum
Schedule of Available-for-sale Securities [Line Items]
Investment maturity period	1 month
US Government Agencies Debt Securities [Member] | Maximum
Schedule of Available-for-sale Securities [Line Items]
Investment maturity period	4 years
Mortgage-backed securities | Minimum
Schedule of Available-for-sale Securities [Line Items]
Investment maturity period	1 year
Mortgage-backed securities | Maximum
Schedule of Available-for-sale Securities [Line Items]
Investment maturity period	29 years
Asset-backed securities | Minimum
Schedule of Available-for-sale Securities [Line Items]
Investment maturity period	1 year
Asset-backed securities | Maximum
Schedule of Available-for-sale Securities [Line Items]
Investment maturity period	6 years

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Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 158,032	$ 123,347
Pension and other post-retirement benefits liability
Amortization of benefits liability	219	614
Income tax provision on pension and other post-retirement benefits liability	(84)	(236)
Foreign currency translation adjustments	(898)	(570)
Available-for-sale investments
Unrealized holding gains (losses) on investments	2,467	0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax	(25)	0
Other Comprehensive Income (Loss) Income Tax (Provision) Benefit On Available For Sale Investment	895	0
Other comprehensive income (loss)	834	(192)
Comprehensive income	$ 158,866	$ 123,155

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Inventories

3 Months Ended

Mar. 31, 2014

Inventory Disclosure [Abstract]

Inventories

Inventories

Inventories consist of the following:

	March 31, 2014		December 31, 2013
Finished products	$	240,339	$	232,658
Feedstock, additives and chemicals	139,189		180,646
Materials and supplies	59,481		58,575
Inventories	$	439,009	$	471,879

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Pension and Post-Retirement Benefit Costs (Components of Net Periodic Benefit Cost) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Pension
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 84	$ 264
Interest cost	595	501
Expected return on plan assets	(809)	(714)
Amortization of prior service cost	74	74
Amortization of net loss	63	429
Net periodic benefit cost	7	554
Post-Retirement Healthcare
Defined Benefit Plan Disclosure [Line Items]
Service cost	5	2
Interest cost	181	147
Expected return on plan assets	0	0
Amortization of prior service cost	13	21
Amortization of net loss	69	90
Net periodic benefit cost	$ 268	$ 260

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Guarantor Disclosures (Condensed Consolidating Financial Information Statement of Operations) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Condensed Financial Statements, Captions [Line Items]
Net sales	$ 1,027,676	$ 864,647
Cost of sales	740,666	636,838
Gross profit	287,010	227,809
Selling, general and administrative expenses	38,955	33,754
Income from operations	248,055	194,055
Interest expense	(9,157)	(6,281)
Other (expense) income, net	2,509	3,519
Income before income taxes	241,407	191,293
Provision for (benefit from) income taxes	83,375	67,946
Equity in net income of subsidiaries	0	0
Net income	158,032	123,347
Comprehensive income (loss)	158,866	123,155
Westlake Chemical Corporation
Condensed Financial Statements, Captions [Line Items]
Net sales	0	0
Cost of sales	0	0
Gross profit	0	0
Selling, general and administrative expenses	546	510
Income from operations	(546)	(510)
Interest expense	(8,947)	(6,258)
Other (expense) income, net	5,006	4,309
Income before income taxes	(4,487)	(2,459)
Provision for (benefit from) income taxes	(1,558)	(874)
Equity in net income of subsidiaries	160,961	124,932
Net income	158,032	123,347
Comprehensive income (loss)	158,866	123,155
Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net sales	1,020,429	856,085
Cost of sales	734,350	629,286
Gross profit	286,079	226,799
Selling, general and administrative expenses	37,063	31,709
Income from operations	249,016	195,090
Interest expense	(210)	(23)
Other (expense) income, net	(1,883)	(290)
Income before income taxes	246,923	194,777
Provision for (benefit from) income taxes	85,110	69,051
Equity in net income of subsidiaries	0	0
Net income	161,813	125,726
Comprehensive income (loss)	161,948	126,104
Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net sales	9,117	10,540
Cost of sales	8,186	9,530
Gross profit	931	1,010
Selling, general and administrative expenses	1,346	1,535
Income from operations	(415)	(525)
Interest expense	0	0
Other (expense) income, net	(614)	(500)
Income before income taxes	(1,029)	(1,025)
Provision for (benefit from) income taxes	(177)	(231)
Equity in net income of subsidiaries	0	0
Net income	(852)	(794)
Comprehensive income (loss)	(1,750)	(1,364)
Eliminations
Condensed Financial Statements, Captions [Line Items]
Net sales	(1,870)	(1,978)
Cost of sales	(1,870)	(1,978)
Gross profit	0	0
Selling, general and administrative expenses	0	0
Income from operations	0	0
Interest expense	0	0
Other (expense) income, net	0	0
Income before income taxes	0	0
Provision for (benefit from) income taxes	0	0
Equity in net income of subsidiaries	(160,961)	(124,932)
Net income	(160,961)	(124,932)
Comprehensive income (loss)	$ (160,198)	$ (124,740)

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Accounts Receivable (Tables)

3 Months Ended

Mar. 31, 2014

Accounts Receivable, Net [Abstract]

Schedule Of Accounts Receivable

Accounts receivable consist of the following:

	March 31, 2014			December 31, 2013
Trade customers	$	415,812		$	410,302
Affiliates	287			315
Allowance for doubtful accounts	(11,592		)	(11,741		)
	404,507			398,876
Federal and state taxes	5,248			20,820
Other	12,124			8,761
Accounts receivable, net	$	421,879		$	428,457

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Financial Instruments Cash Equivalents (Details) (Held-to-maturity Securities, USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Held-to-maturity Securities
Cash Equivalents [Line Items]
Cash Equivalents, at Carrying Value	$ 411,527	$ 263,967

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Accumulated Other Comprehensive Income

3 Months Ended

Mar. 31, 2014

Equity [Abstract]

Accumulated Other Comprehensive Income

Accumulated Other Comprehensive Loss

Changes in accumulated other comprehensive income (loss) by component for the three months ended March 31, 2014 and 2013 were as follows:

	Benefits Liability, Net of Tax			Cumulative Foreign Currency Exchange			Net Unrealized Holding Gains on Investments, Net of Tax		Total
Balances at December 31, 2013	$	(6,696	)	$	3,904		$	176	$	(2,616	)
Other comprehensive (loss) income before    reclassifications	—			(898		)	1,581		683
Amounts reclassified from accumulated other    comprehensive loss	135			—			16		151
Net other comprehensive income (loss) for the period	135			(898		)	1,597		834
Balances at March 31, 2014	$	(6,561	)	$	3,006		$	1,773	$	(1,782	)

	Benefits Liability, Net of Tax			Cumulative Foreign Currency Exchange			Total
Balances at December 31, 2012	$	(16,351	)	$	5,511		$	(10,840	)
Other comprehensive loss before reclassifications	—			(570		)	(570		)
Amounts reclassified from accumulated other comprehensive loss	378			—			378
Net other comprehensive income (loss) for the period	378			(570		)	(192		)
Balances at March 31, 2013	$	(15,973	)	$	4,941		$	(11,032	)

The following table provides the details of the amounts reclassified from accumulated other comprehensive income (loss) into net income in the consolidated statements of operations for the three months ended March 31, 2014 and 2013:

Details about Accumulated Other Comprehensive    Income (Loss) Components	Location of Reclassification (Income (Expense)) in Consolidated Statements of Operations	Three Months Ended March 31,
		2014			2013
Amortization of pension and other post-retirement items
Prior service costs	(1)	$	(87	)	$	(95	)
Net loss	(1)	(132		)	(519		)
		(219		)	(614		)
	Provision for income taxes	84			236
		(135		)	(378		)
Net unrealized gains on available-for-sale investments
Realized loss on available-for-sale investments	Other income, net	(25		)	—
	Provision for income taxes	9			—
		(16		)	—
Total reclassifications for the period		$	(151	)	$	(378	)

_____________

(1) These accumulated other comprehensive loss components are included in the computation of net periodic benefit cost. For additional information, please read Note 10 (Employee Benefits) to the financial statements included in the 2013 Form 10-K.