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Related Party Transactions (Services from Related Parties Included in SG&A Expenses) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Related Party Transaction [Line Items] |  |  |
Services received from Westlake and included in selling, general and administrative expenses | $ 28,271 | $ 28,495 | $ 29,751
Affiliated Entity | Westlake |  |  |
Related Party Transaction [Line Items] |  |  |
Services received from Westlake and included in selling, general and administrative expenses | $ 25,017 | $ 25,654 | $ 27,085

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