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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
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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Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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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.

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