Revenue From Contracts With Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Disaggregation of Revenue [Line Items]
Total Revenues	$ 504,134	$ 538,782	$ 620,500
Graphite Electrodes
Disaggregation of Revenue [Line Items]
Total Revenues	460,638	493,644	592,008
By- Products and Other
Disaggregation of Revenue [Line Items]
Total Revenues	$ 43,496	$ 45,138	$ 28,492

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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+ Details

- 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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