Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Current assets
Cash and cash equivalents	$ 945,649	$ 880,601
Accounts receivable, net	527,127	560,666
Inventories	480,380	525,776
Prepaid expenses and other current assets	18,018	11,807
Deferred income taxes	30,988	32,437
Total current assets	2,002,162	2,011,287
Property, plant and equipment, net	2,751,486	2,757,557
Equity investments	64,721	61,305
Other assets, net
Intangible assets, net	207,254	218,431
Deferred charges and other assets	154,162	165,410
Total other assets, net	361,416	383,841
Total assets	5,179,785	5,213,990
Current liabilities
Accounts payable	247,493	261,062
Accrued liabilities	205,714	276,118
Total current liabilities	453,207	537,180
Long-term debt	764,027	763,997
Deferred income taxes	534,679	536,066
Other liabilities	157,130	174,859
Total liabilities	1,909,043	2,012,102
Commitments and contingencies (Notes 7 and 16)
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, 300,000,000 shares authorized; 134,679,064 and 134,679,064 shares issued at March 31, 2015 and December 31, 2014, respectively	1,347	1,347
Common stock, held in treasury, at cost; 1,817,122 and 1,787,546 shares at March 31, 2015 and December 31, 2014, respectively	(98,275)	(96,372)
Additional paid-in capital	534,542	530,441
Retained earnings	2,679,906	2,555,528
Accumulated other comprehensive loss	(137,662)	(79,433)
Total Westlake Chemical Corporation stockholders' equity	2,979,858	2,911,511
Noncontrolling interests	290,884	290,377
Total equity	3,270,742	3,201,888
Total liabilities and equity	$ 5,179,785	$ 5,213,990