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Segment Reporting | 3 Months Ended
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Mar. 31, 2025
Segment Reporting [Abstract] |
Segment Reporting Disclosure | Segment Reporting Our Industrial Materials segment, our only operating and reportable segment, manufactures high-quality graphite electrodes essential to the production of EAF steel and other ferrous and non-ferrous metals. Petroleum needle coke, a crystalline form of carbon derived from decant oil, is a key raw material used in the production of graphite electrodes. We utilize the majority of the needle coke that we produce internally to manufacture our graphite electrodes and as a result approximately 91% of our revenues from external customers are derived from the sale of graphite electrodes. Our chief operating decision maker is our chief executive officer. The chief operating decision maker assesses performance for our Industrial Materials segment and decides how to allocate resources based on net income or losses, which are reported on the Condensed Consolidated Statements of Operations and Comprehensive Loss. The chief operating decision maker uses net loss to evaluate growth trends, establish budgets, assess operational efficiencies and evaluate our overall financial performance. The following table presents selected financial information with respect to the Company’s single operating segment for the three months ended March 31, 2025 and 2024:
| Three Months Ended March 31,
| 2025 | 2024
| (Dollars in thousands)
Net sales | $ | 111,839 |  | $ | 136,584 |
Cash cost of goods sold(1) | 90,206 |  | 110,742 |
Other segment expenses | 20,559 |  | 24,462 |
Lower of cost or market inventory valuation adjustment | 2,783 |  | 2,692 |
Research and development | 1,879 |  | 1,627 |
Selling and administrative expenses | 14,622 |  | 15,277 |
Rationalization expenses | — |  | 3,145 |
Other expense (income), net | 447 |  | (393) |
Interest expense | 29,841 |  | 15,626 |
Interest income | (1,935) |  | (1,524) |
Income tax benefit | (7,212) |  | (4,201) |
Net loss | $ | (39,351) |  | $ | (30,869) |
(1) Cash cost of goods sold is defined as cost of goods sold less depreciation and amortization and less cost of goods sold associated with the portion of our sales that consist of deliveries of by-products of the manufacturing processes, and is the significant expense the chief operating decision maker uses to evaluate segment expenses.

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- Definition The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 48 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482785/280-10-55-48 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards 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