Segment Reporting (Schedule of Operating Segments) (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||||||
|---|---|---|---|---|---|---|---|---|
Sep. 30, 2026 |
Jun. 30, 2026 |
Mar. 31, 2026 |
Sep. 30, 2025 |
Jun. 30, 2025 |
Mar. 31, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
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| Segment Reporting [Line Items] | ||||||||
| Net sales | $ 140,163 | $ 143,998 | $ 392,626 | $ 387,677 | ||||
| Lower of cost or market inventory valuation adjustment | 2,013 | 1,650 | 9,792 | 6,326 | ||||
| Research and development | 1,458 | 1,639 | 4,440 | 4,866 | ||||
| Selling and administrative expenses | 12,964 | 13,784 | 39,808 | 41,673 | ||||
| Restructuring Charges | 13,874 | 0 | 13,874 | 0 | ||||
| Other (income) expense, net | (774) | 142 | (12,288) | (1,837) | ||||
| Interest expense | 25,916 | 24,517 | 74,482 | 79,776 | ||||
| Interest income | (1,151) | (1,383) | (2,705) | (5,184) | ||||
| Income tax expense | 105 | 90 | 3,117 | 44,085 | ||||
| Net loss | (46,768) | $ (40,471) | $ (43,277) | (28,482) | $ (86,886) | $ (39,351) | (130,516) | (154,719) |
| Industrial Materials Segment | ||||||||
| Segment Reporting [Line Items] | ||||||||
| Net sales | 140,163 | 143,998 | 392,626 | 387,677 | ||||
| Cash cost of goods sold | 105,220 | 109,296 | 321,660 | 306,856 | ||||
| Other segment expenses | 27,306 | 22,745 | 70,962 | 65,835 | ||||
| Lower of cost or market inventory valuation adjustment | 2,013 | 1,650 | 9,792 | 6,326 | ||||
| Research and development | 1,458 | 1,639 | 4,440 | 4,866 | ||||
| Selling and administrative expenses | 12,964 | 13,784 | 39,808 | 41,673 | ||||
| Restructuring Charges | 13,874 | 0 | 13,874 | 0 | ||||
| Other (income) expense, net | (774) | 142 | (12,288) | (1,837) | ||||
| Interest expense | 25,916 | 24,517 | 74,482 | 79,776 | ||||
| Interest income | (1,151) | (1,383) | (2,705) | (5,184) | ||||
| Income tax expense | 105 | 90 | 3,117 | 44,085 | ||||
| Net loss | $ (46,768) | $ (28,482) | $ (130,516) | $ (154,719) | ||||
| X | ||||||||||
- Definition Cost of goods sold excluding non-cash expenses. No definition available.
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| X | ||||||||||
- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of interest expense classified as operating and nonoperating. Includes, but is not limited to, cost of borrowing accounted for as interest expense. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of interest income earned from interest bearing assets classified as other. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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| X | ||||||||||
- Definition Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business). Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Amount of expense for research and development. Includes, but is not limited to, cost for computer software product to be sold, leased, or otherwise marketed and writeoff of research and development assets acquired in transaction other than business combination or joint venture formation or both. Excludes write-down of intangible asset acquired in business combination or from joint venture formation or both, used in research and development activity. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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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. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition 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. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of other expense (income) and loss (gain) calculated as difference between segment revenue and separately disclosed expense category to arrive at segment profit (loss). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Details
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