Related Party Transactions (Debt Payable to Related Parties) (Details) - USD ($) $ in Thousands |
3 Months Ended | ||
|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
Dec. 31, 2025 |
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| Related Party Transaction [Line Items] | |||
| Interest expense—Westlake | $ 5,085 | $ 5,537 | |
| Affiliated Entity | |||
| Related Party Transaction [Line Items] | |||
| Accrued interest on related party debt | 5,085 | $ 5,508 | |
| Affiliated Entity | Westlake | |||
| Related Party Transaction [Line Items] | |||
| Interest expense—Westlake | 5,085 | $ 5,537 | |
| Accrued interest on related party debt | 5,085 | 5,508 | |
| Long-term debt payable to Westlake | $ 399,674 | $ 399,674 | |
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- Definition Amount of interest expense classified as nonoperating. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of long-term debt classified as other, payable after one year or the operating cycle, if longer. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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