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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