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Related Party Transactions (Accounts Receivable from and Accounts Payable to Related Parties) (Details) - Affiliated Entity - USD ($) $ in Thousands | Dec. 31, 2025 | Dec. 31, 2024
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Related Party Transaction [Line Items] |  |
Accounts receivable, net—Westlake | $ 63,571 | $ 31,975
Accounts payable—third parties | $ 19,132 | $ 20,744

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