Related Party Transactions (Sales to Related Parties) (Details) - Affiliated Entity - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
Related Party Transaction [Line Items]
Net co-products, ethylene and other sales—third parties	$ 238,030	$ 269,076	$ 501,121	$ 459,857
Buyer deficiency fee					$ 5,835
Fixed cost of production associated with estimated excess quantities			$ 2,100

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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- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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