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Long-Term Debt (Tables) | 3 Months Ended
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Mar. 31, 2017
Debt Disclosure [Abstract] |
Schedule Of Long-Term Debt | Long-term debt consists of the following:
|  | March 31, 2017 |  | December 31, 2016
|  | Principal Amount |  | Unamortized Premium, Discount and Debt Issuance Costs |  | Net Long-term Debt |  | Principal Amount |  | Unamortized Premium, Discount and Debt Issuance Costs |  | Net Long-term Debt
Revolving credit facility |  | $ | 250,000 |  |  | $ | — |  |  | $ | 250,000 |  |  | $ | 325,000 |  |  | $ | — |  |  | $ | 325,000 |
4.625% senior notes due 2021 (the "4.625% Westlake 2021 Senior Notes") |  | 624,793 |  |  | 25,123 |  |  | 649,916 |  |  | 624,793 |  |  | 26,837 |  |  | 651,630 |
4.625% senior notes due 2021 (the "4.625% Subsidiary 2021 Senior Notes") |  | 63,207 |  |  | 2,690 |  |  | 65,897 |  |  | 63,207 |  |  | 2,862 |  |  | 66,069 |
3.60% senior notes due 2022 |  | 250,000 |  |  | (1,806 | ) |  | 248,194 |  |  | 250,000 |  |  | (1,891 | ) |  | 248,109 |
4.875% senior notes due 2023 (the "4.875% Westlake 2023 Senior Notes") |  | 433,793 |  |  | 12,840 |  |  | 446,633 |  |  | 433,793 |  |  | 13,431 |  |  | 447,224 |
4.875% senior notes due 2023 (the "4.875% Subsidiary 2023 Senior Notes") |  | 16,207 |  |  | 519 |  |  | 16,726 |  |  | 16,207 |  |  | 540 |  |  | 16,747 |
3.60% senior notes due 2026 (the "3.60% 2026 Senior Notes") |  | 750,000 |  |  | (10,564 | ) |  | 739,436 |  |  | 750,000 |  |  | (10,757 | ) |  | 739,243 |
Loan related to tax-exempt waste disposal revenue bonds due 2027 |  | 10,889 |  |  | — |  |  | 10,889 |  |  | 10,889 |  |  | — |  |  | 10,889 |
6 ½% senior notes due 2029 |  | 100,000 |  |  | (898 | ) |  | 99,102 |  |  | 100,000 |  |  | (916 | ) |  | 99,084 |
6 ¾% senior notes due 2032 |  | 250,000 |  |  | (1,853 | ) |  | 248,147 |  |  | 250,000 |  |  | (1,883 | ) |  | 248,117 |
6 ½% senior notes due 2035 (the "6 ½% 2035 GO Zone Senior Notes") |  | 89,000 |  |  | (828 | ) |  | 88,172 |  |  | 89,000 |  |  | (839 | ) |  | 88,161 |
6 ½% senior notes due 2035 (the "6 ½% 2035 IKE Zone Senior Notes") |  | 65,000 |  |  | (594 | ) |  | 64,406 |  |  | 65,000 |  |  | (602 | ) |  | 64,398 |
5.0% senior notes due 2046 (the "5.0% 2046 Senior Notes") |  | 700,000 |  |  | (25,876 | ) |  | 674,124 |  |  | 700,000 |  |  | (26,017 | ) |  | 673,983 |
Long-term debt, net |  | $ | 3,602,889 |  |  | $ | (1,247 | ) |  | $ | 3,601,642 |  |  | $ | 3,677,889 |  |  | $ | 765 |  |  | $ | 3,678,654 |

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