Subsequent Events Subsequent Events - USD ($) $ in Thousands |
9 Months Ended | |
|---|---|---|
Oct. 04, 2018 |
Sep. 30, 2018 |
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| Subsequent Event [Line Items] | ||
| Subsequent Events [Text Block] | Subsequent Events At-The-Market Program On October 4, 2018, the Partnership and Westlake Chemical Partners GP LLC, the general partner of the Partnership, entered into an Equity Distribution Agreement with UBS Securities LLC, Barclays Capital Inc., Citigroup Global Markets Inc., Deutsche Bank Securities Inc., RBC Capital Markets, LLC, Merrill Lynch, Pierce, Fenner & Smith Incorporated and Wells Fargo Securities, LLC to offer and sell the Partnership's common units, from time to time, up to an aggregate offering amount of $50,000. Ethylene Sales Agreement On November 1, 2018, OpCo and Westlake entered into an amendment to the Ethylene Sales Agreement in order to provide OpCo with the option to curtail up to approximately 5% of its ethylene production annually in the event OpCo reasonably determines that its sales of such ethylene to third parties during the relevant period would be uneconomic. |
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| Subsequent Event [Member] | ||
| Subsequent Event [Line Items] | ||
| Partners Units, Maximum Aggregate Offering Amount, ATM | $ 50,000 |