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Guarantor Disclosures (Condensed Consolidating Financial Information Balance Sheets) (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | --- | --- | ---
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | $ 813,468 | $ 461,301 | $ 591,556 | $ 790,078
Marketable Securities, Current | 0 | 239,388 |  |
Accounts receivable, net | 592,964 | 428,457 |  |
Inventories | 500,552 | 471,879 |  |
Prepaid expenses and other current assets | 18,884 | 13,888 |  |
Deferred income taxes | 26,080 | 34,169 |  |
Total current assets | 1,951,948 | 1,649,082 |  |
Property, plant and equipment, net | 2,710,475 | 2,088,014 |  |
Equity investments | 70,828 | 66,875 |  |
Other assets, net | 393,032 | 256,938 |  |
Total assets | 5,126,283 | 4,060,909 |  |
Accounts payable | 263,365 | 249,613 |  |
Accrued liabilities | 309,671 | 155,245 |  |
Total current liabilities | 573,036 | 404,858 |  |
Long-term debt | 763,968 | 763,879 |  |
Deferred income taxes | 513,773 | 437,976 |  |
Other liabilities | 153,158 | 35,593 |  |
Total liabilities | 2,003,935 | 1,642,306 |  |
Total Westlake Chemical Corporation stockholders' equity | 2,833,861 | 2,418,603 |  |
Noncontrolling interests | 288,487 | 0 |  |
Total equity | 3,122,348 | 2,418,603 |  | 1,872,256
Total liabilities and equity | 5,126,283 | 4,060,909 |  |
Westlake Chemical Corporation |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | 652,709 | 420,948 | 560,261 | 753,881
Marketable Securities, Current |  | 239,388 |  |
Accounts receivable, net | 15,064 | 3,879 |  |
Inventories | 0 | 0 |  |
Prepaid expenses and other current assets | 137 | 778 |  |
Deferred income taxes | 342 | 441 |  |
Total current assets | 668,252 | 665,434 |  |
Property, plant and equipment, net | 0 | 0 |  |
Equity investments | 3,878,703 | 2,815,752 |  |
Other assets, net | 34,847 | 15,393 |  |
Total assets | 4,581,802 | 3,496,579 |  |
Accounts payable | 979,414 | 316,652 |  |
Accrued liabilities | 15,448 | 8,334 |  |
Total current liabilities | 994,862 | 324,986 |  |
Long-term debt | 753,079 | 752,990 |  |
Deferred income taxes | 0 | 0 |  |
Other liabilities | 0 | 0 |  |
Total liabilities | 1,747,941 |  |  |
Total Westlake Chemical Corporation stockholders' equity | 2,833,861 | 2,418,603 |  |
Noncontrolling interests | 0 |  |  |
Total equity | 2,833,861 |  |  |
Total liabilities and equity | 4,581,802 | 3,496,579 |  |
100% Owned Guarantor Subsidiaries |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | 1,644 | 6,227 | 4,494 | 6,973
Marketable Securities, Current |  | 0 |  |
Accounts receivable, net | 1,377,250 | 666,344 |  |
Inventories | 385,826 | 339,929 |  |
Prepaid expenses and other current assets | 14,737 | 11,055 |  |
Deferred income taxes | 25,446 | 28,974 |  |
Total current assets | 1,804,903 | 1,052,529 |  |
Property, plant and equipment, net | 1,451,807 | 1,318,119 |  |
Equity investments | 1,207,569 | 636,461 |  |
Other assets, net | 351,271 | 423,901 |  |
Total assets | 4,815,550 | 3,431,010 |  |
Accounts payable | 157,562 | 100,570 |  |
Accrued liabilities | 238,225 | 134,452 |  |
Total current liabilities | 395,787 | 235,022 |  |
Long-term debt | 10,889 | 10,889 |  |
Deferred income taxes | 473,343 | 260,171 |  |
Other liabilities | 31,616 | 34,571 |  |
Total liabilities | 911,635 |  |  |
Total Westlake Chemical Corporation stockholders' equity | 3,903,915 | 2,890,357 |  |
Noncontrolling interests | 0 |  |  |
Total equity | 3,903,915 |  |  |
Total liabilities and equity | 4,815,550 | 3,431,010 |  |
OpCo (Less Than 100% Owned Guarantor Subsidiary) |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | 89,144 | 0 | 0 | 0
Marketable Securities, Current |  | 0 |  |
Accounts receivable, net | 58,106 | 71,812 |  |
Inventories | 5,551 | 116,377 |  |
Prepaid expenses and other current assets | 303 | 257 |  |
Deferred income taxes | 0 | 4,448 |  |
Total current assets | 153,104 | 192,894 |  |
Property, plant and equipment, net | 806,648 | 762,972 |  |
Equity investments | 0 | 10,411 |  |
Other assets, net | 61,679 | 75,197 |  |
Total assets | 1,021,431 | 1,041,474 |  |
Accounts payable | 29,856 | 122,564 |  |
Accrued liabilities | 3,412 | 26,688 |  |
Total current liabilities | 33,268 | 149,252 |  |
Long-term debt | 188,523 | 252,973 |  |
Deferred income taxes | 1,507 | 182,855 |  |
Other liabilities | 0 | 962 |  |
Total liabilities | 223,298 |  |  |
Total Westlake Chemical Corporation stockholders' equity | 798,133 | 455,432 |  |
Noncontrolling interests | 0 |  |  |
Total equity | 798,133 |  |  |
Total liabilities and equity | 1,021,431 | 1,041,474 |  |
Non-Guarantor Subsidiaries |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | 69,971 | 34,126 | 26,801 | 29,224
Marketable Securities, Current |  | 0 |  |
Accounts receivable, net | 170,833 | 2,755 |  |
Inventories | 109,175 | 15,573 |  |
Prepaid expenses and other current assets | 3,707 | 1,798 |  |
Deferred income taxes | 292 | 306 |  |
Total current assets | 353,978 | 54,558 |  |
Property, plant and equipment, net | 452,020 | 6,923 |  |
Equity investments | 356,286 | 31,518 |  |
Other assets, net | 137,990 | 1,199 |  |
Total assets | 1,300,274 | 94,198 |  |
Accounts payable | 100,129 | 10,649 |  |
Accrued liabilities | 77,279 | 1,282 |  |
Total current liabilities | 177,408 | 11,931 |  |
Long-term debt | 0 | 0 |  |
Deferred income taxes | 43,155 | 729 |  |
Other liabilities | 121,542 | 60 |  |
Total liabilities | 342,105 |  |  |
Total Westlake Chemical Corporation stockholders' equity | 669,682 | 81,478 |  |
Noncontrolling interests | 288,487 |  |  |
Total equity | 958,169 |  |  |
Total liabilities and equity | 1,300,274 | 94,198 |  |
Eliminations |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | 0 | 0 | 0 | 0
Marketable Securities, Current |  | 0 |  |
Accounts receivable, net | (1,028,289) | (316,333) |  |
Inventories | 0 | 0 |  |
Prepaid expenses and other current assets | 0 | 0 |  |
Deferred income taxes | 0 | 0 |  |
Total current assets | (1,028,289) | (316,333) |  |
Property, plant and equipment, net | 0 | 0 |  |
Equity investments | (5,371,730) | (3,427,267) |  |
Other assets, net | (192,755) | (258,752) |  |
Total assets | (6,592,774) | (4,002,352) |  |
Accounts payable | (1,003,596) | (300,822) |  |
Accrued liabilities | (24,693) | (15,511) |  |
Total current liabilities | (1,028,289) | (316,333) |  |
Long-term debt | (188,523) | (252,973) |  |
Deferred income taxes | (4,232) | (5,779) |  |
Other liabilities | 0 | 0 |  |
Total liabilities | (1,221,044) |  |  |
Total Westlake Chemical Corporation stockholders' equity | (5,371,730) | (3,427,267) |  |
Noncontrolling interests | 0 |  |  |
Total equity | (5,371,730) |  |  |
Total liabilities and equity | $ (6,592,774) | $ (4,002,352) |  |

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