| Three Months Ended \u00a0March 31, | |||||||||||
| 2025 | 2024 | ||||||||||
| (Dollars in thousands) | |||||||||||
| Graphite Electrodes | $ | 101,262\u00a0 | $ | 123,987\u00a0 | |||||||
| By-products and other | 10,577\u00a0 | 12,597\u00a0 | |||||||||
| Total Revenues | $ | 111,839\u00a0 | $ | 136,584\u00a0 |
| Three Months Ended \u00a0March 31, | |||||||||||
| 2025 | 2024 | ||||||||||
| (Dollars in thousands) | |||||||||||
| Graphite Electrodes | $ | 101,262\u00a0 | $ | 123,987\u00a0 | |||||||
| By-products and other | 10,577\u00a0 | 12,597\u00a0 | |||||||||
| Total Revenues | $ | 111,839\u00a0 | $ | 136,584\u00a0 |
| Three Months Ended \u00a0March 31, | ||||||||
| 2025 | 2024 | |||||||
| (Dollars in thousands) | ||||||||
| Net sales | $ | 111,839\u00a0 | $ | 136,584\u00a0 | ||||
Cash cost of goods sold(1) | 90,206\u00a0 | 110,742\u00a0 | ||||||
| Other segment expenses | 20,559\u00a0 | 24,462\u00a0 | ||||||
| Lower of cost or market inventory valuation adjustment | 2,783\u00a0 | 2,692\u00a0 | ||||||
| Research and development | 1,879\u00a0 | 1,627\u00a0 | ||||||
| Selling and administrative expenses | 14,622\u00a0 | 15,277\u00a0 | ||||||
| Rationalization expenses | \u2014\u00a0 | 3,145\u00a0 | ||||||
| Other expense (income), net | 447\u00a0 | (393) | ||||||
| Interest expense | 29,841\u00a0 | 15,626\u00a0 | ||||||
| Interest income | (1,935) | (1,524) | ||||||
| Income tax benefit | (7,212) | (4,201) | ||||||
| Net loss | $ | (39,351) | $ | (30,869) |
| Three Months Ended \u00a0March 31, | ||||||||
| 2025 | 2024 | |||||||
| (Dollars in thousands) | ||||||||
| Net sales | $ | 111,839\u00a0 | $ | 136,584\u00a0 | ||||
Cash cost of goods sold(1) | 90,206\u00a0 | 110,742\u00a0 | ||||||
| Other segment expenses | 20,559\u00a0 | 24,462\u00a0 | ||||||
| Lower of cost or market inventory valuation adjustment | 2,783\u00a0 | 2,692\u00a0 | ||||||
| Research and development | 1,879\u00a0 | 1,627\u00a0 | ||||||
| Selling and administrative expenses | 14,622\u00a0 | 15,277\u00a0 | ||||||
| Rationalization expenses | \u2014\u00a0 | 3,145\u00a0 | ||||||
| Other expense (income), net | 447\u00a0 | (393) | ||||||
| Interest expense | 29,841\u00a0 | 15,626\u00a0 | ||||||
| Interest income | (1,935) | (1,524) | ||||||
| Income tax benefit | (7,212) | (4,201) | ||||||
| Net loss | $ | (39,351) | $ | (30,869) |
| \u00a0 | March 31, 2025 | December 31, 2024 | |||||||||||||||||||||||||||||||||
| Gross Carrying Amount | Accumulated Amortization | Net Carrying Amount | Gross Carrying Amount | Accumulated Amortization | Net Carrying Amount | ||||||||||||||||||||||||||||||
| (Dollars in thousands) | |||||||||||||||||||||||||||||||||||
| Trade names | $ | 22,500\u00a0 | $ | (18,427) | $ | 4,073\u00a0 | $ | 22,500\u00a0 | $ | (18,226) | $ | 4,274\u00a0 | |||||||||||||||||||||||
| Technology and know-how | 55,300\u00a0 | (49,249) | 6,051\u00a0 | 55,300\u00a0 | (48,613) | 6,687\u00a0 | |||||||||||||||||||||||||||||
| Customer-related intangibles | 64,500\u00a0 | (42,123) | 22,377\u00a0 | 64,500\u00a0 | (41,063) | 23,437\u00a0 | |||||||||||||||||||||||||||||
| Total finite-lived intangible assets | $ | 142,300\u00a0 | $ | (109,799) | $ | 32,501\u00a0 | $ | 142,300\u00a0 | $ | (107,902) | $ | 34,398\u00a0 |
| \u00a0 | March 31, 2025 | December 31, 2024 | |||||||||||||||||||||||||||||||||
| Gross Carrying Amount | Accumulated Amortization | Net Carrying Amount | Gross Carrying Amount | Accumulated Amortization | Net Carrying Amount | ||||||||||||||||||||||||||||||
| (Dollars in thousands) | |||||||||||||||||||||||||||||||||||
| Trade names | $ | 22,500\u00a0 | $ | (18,427) | $ | 4,073\u00a0 | $ | 22,500\u00a0 | $ | (18,226) | $ | 4,274\u00a0 | |||||||||||||||||||||||
| Technology and know-how | 55,300\u00a0 | (49,249) | 6,051\u00a0 | 55,300\u00a0 | (48,613) | 6,687\u00a0 | |||||||||||||||||||||||||||||
| Customer-related intangibles | 64,500\u00a0 | (42,123) | 22,377\u00a0 | 64,500\u00a0 | (41,063) | 23,437\u00a0 | |||||||||||||||||||||||||||||
| Total finite-lived intangible assets | $ | 142,300\u00a0 | $ | (109,799) | $ | 32,501\u00a0 | $ | 142,300\u00a0 | $ | (107,902) | $ | 34,398\u00a0 |
| March 31, 2025 | December 31, 2024 | ||||||||||
| \u00a0 | (Dollars in thousands) | ||||||||||
| Initial First Lien Term Loans due 2029 | 175,000\u00a0 | 175,000\u00a0 | |||||||||
| Existing 4.625% Senior Notes due 2028 | 1,755\u00a0 | 1,755\u00a0 | |||||||||
| New 4.625% Second Lien Notes due 2029 | 498,245\u00a0 | 498,245\u00a0 | |||||||||
| Existing 9.875% Senior Notes due 2028 | 3,833\u00a0 | 3,833\u00a0 | |||||||||
| New 9.875% Second Lien Notes due 2029 | 446,167\u00a0 | 446,167\u00a0 | |||||||||
| Unamortized debt discount and issuance costs | (36,137) | (38,085) | |||||||||
| Total long-term debt | $ | 1,088,863\u00a0 | $ | 1,086,915\u00a0 |
| March 31, 2025 | December 31, 2024 | ||||||||||
| \u00a0 | (Dollars in thousands) | ||||||||||
| Initial First Lien Term Loans due 2029 | 175,000\u00a0 | 175,000\u00a0 | |||||||||
| Existing 4.625% Senior Notes due 2028 | 1,755\u00a0 | 1,755\u00a0 | |||||||||
| New 4.625% Second Lien Notes due 2029 | 498,245\u00a0 | 498,245\u00a0 | |||||||||
| Existing 9.875% Senior Notes due 2028 | 3,833\u00a0 | 3,833\u00a0 | |||||||||
| New 9.875% Second Lien Notes due 2029 | 446,167\u00a0 | 446,167\u00a0 | |||||||||
| Unamortized debt discount and issuance costs | (36,137) | (38,085) | |||||||||
| Total long-term debt | $ | 1,088,863\u00a0 | $ | 1,086,915\u00a0 |
| March 31, 2025 | December 31, 2024 | ||||||||||
| \u00a0 | (Dollars in thousands) | ||||||||||
| Inventories: | |||||||||||
| Raw materials and supplies | $ | 87,205\u00a0 | $ | 78,386\u00a0 | |||||||
| Work in process | 133,933\u00a0 | 122,590\u00a0 | |||||||||
| Finished goods | 33,129\u00a0 | 30,265\u00a0 | |||||||||
| \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Total | $ | 254,267\u00a0 | $ | 231,241\u00a0 |
| March 31, 2025 | December 31, 2024 | ||||||||||
| \u00a0 | (Dollars in thousands) | ||||||||||
| Inventories: | |||||||||||
| Raw materials and supplies | $ | 87,205\u00a0 | $ | 78,386\u00a0 | |||||||
| Work in process | 133,933\u00a0 | 122,590\u00a0 | |||||||||
| Finished goods | 33,129\u00a0 | 30,265\u00a0 | |||||||||
| \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Total | $ | 254,267\u00a0 | $ | 231,241\u00a0 |
| Three Months Ended \u00a0March 31, | |||||||||||
| 2025 | 2024 | ||||||||||
| \u00a0 | (Dollars\u00a0in\u00a0thousands) | ||||||||||
| Interest incurred on debt | $ | 22,532\u00a0 | $ | 17,095\u00a0 | |||||||
| Accretion of original issue discount | 1,267\u00a0 | 520\u00a0 | |||||||||
| Amortization of debt issuance costs | 681\u00a0 | 748\u00a0 | |||||||||
| Debt modification costs | 5,361\u00a0 | \u2014\u00a0 | |||||||||
| Amortization of interest rate swap deferred gains | \u2014\u00a0 | (2,737) | |||||||||
| Total interest expense | $ | 29,841\u00a0 | $ | 15,626\u00a0 |
| Three Months Ended \u00a0March 31, | |||||||||||
| 2025 | 2024 | ||||||||||
| \u00a0 | (Dollars\u00a0in\u00a0thousands) | ||||||||||
| Interest incurred on debt | $ | 22,532\u00a0 | $ | 17,095\u00a0 | |||||||
| Accretion of original issue discount | 1,267\u00a0 | 520\u00a0 | |||||||||
| Amortization of debt issuance costs | 681\u00a0 | 748\u00a0 | |||||||||
| Debt modification costs | 5,361\u00a0 | \u2014\u00a0 | |||||||||
| Amortization of interest rate swap deferred gains | \u2014\u00a0 | (2,737) | |||||||||
| Total interest expense | $ | 29,841\u00a0 | $ | 15,626\u00a0 |
| Three Months Ended \u00a0March 31, | |||||||||||
| 2025 | 2024 | ||||||||||
| (Dollars\u00a0in\u00a0thousands) | |||||||||||
| Income tax benefit | $ | (7,212) | $ | (4,201) | |||||||
| Loss before income taxes | (46,563) | (35,070) | |||||||||
| Effective tax rate | 15.5\u00a0 | % | 12.0\u00a0 | % |
| Three Months Ended \u00a0March 31, | |||||||||||
| 2025 | 2024 | ||||||||||
| (Dollars\u00a0in\u00a0thousands) | |||||||||||
| Income tax benefit | $ | (7,212) | $ | (4,201) | |||||||
| Loss before income taxes | (46,563) | (35,070) | |||||||||
| Effective tax rate | 15.5\u00a0 | % | 12.0\u00a0 | % |
| March 31, 2025 | December 31, 2024 | ||||||||||
| \u00a0 | Notional Amount | Notional Amount | |||||||||
| (Dollars in thousands) | |||||||||||
| Derivative instruments not designated as hedges: | |||||||||||
| Foreign currency derivatives | $ | 14,747\u00a0 | $ | 11,918\u00a0 |
| \u00a0 | \u00a0 | Amount\u00a0of\u00a0Gain Recognized | ||||||||||||||||||
| Location of Realized Gain Recognized in the Condensed Consolidated Statement of Operations | Three Months Ended March 31, | |||||||||||||||||||
| 2025 | 2024 | |||||||||||||||||||
| Derivatives designated as cash flow hedges: | (Dollars in thousands) | |||||||||||||||||||
| Foreign currency derivatives | Cost of goods sold | $ | (57) | $ | (68) | |||||||||||||||
| Commodity derivative contracts | Cost of goods sold | \u2014\u00a0 | (2,462) | |||||||||||||||||
| Interest rate swap contracts | Interest expense | \u2014\u00a0 | (2,737) | |||||||||||||||||
| \u00a0 | \u00a0 | Amount\u00a0of\u00a0(Gain)/Loss Recognized | ||||||||||||||||||
| Location of (Gain)/Loss Recognized in the Condensed Consolidated Statement of Operations | Three Months Ended March 31, | |||||||||||||||||||
| 2025 | 2024 | |||||||||||||||||||
| Derivatives not designated as hedges: | (Dollars in thousands) | |||||||||||||||||||
| Foreign currency derivatives | Cost of goods sold, other (income) expense, net | $ | (236) | $ | 127\u00a0 | |||||||||||||||
| March 31, 2025 | December 31, 2024 | ||||||||||
| \u00a0 | \u00a0\u00a0\u00a0Fair\u00a0Value | \u00a0\u00a0\u00a0Fair\u00a0Value | |||||||||
| (Dollars in thousands) | |||||||||||
| Prepaid and other current assets | |||||||||||
| Foreign currency derivatives | 237\u00a0 | 296\u00a0 | |||||||||
| Other accrued liabilities | |||||||||||
| Foreign currency derivatives | (43) | (248) | |||||||||
| Net asset | $ | 194\u00a0 | $ | 48\u00a0 |
| March 31, 2025 | December 31, 2024 | ||||||||||
| \u00a0 | Notional Amount | Notional Amount | |||||||||
| (Dollars in thousands) | |||||||||||
| Derivative instruments not designated as hedges: | |||||||||||
| Foreign currency derivatives | $ | 14,747\u00a0 | $ | 11,918\u00a0 |
| \u00a0 | \u00a0 | Amount\u00a0of\u00a0Gain Recognized | ||||||||||||||||||
| Location of Realized Gain Recognized in the Condensed Consolidated Statement of Operations | Three Months Ended March 31, | |||||||||||||||||||
| 2025 | 2024 | |||||||||||||||||||
| Derivatives designated as cash flow hedges: | (Dollars in thousands) | |||||||||||||||||||
| Foreign currency derivatives | Cost of goods sold | $ | (57) | $ | (68) | |||||||||||||||
| Commodity derivative contracts | Cost of goods sold | \u2014\u00a0 | (2,462) | |||||||||||||||||
| Interest rate swap contracts | Interest expense | \u2014\u00a0 | (2,737) | |||||||||||||||||
| \u00a0 | \u00a0 | Amount\u00a0of\u00a0(Gain)/Loss Recognized | ||||||||||||||||||
| Location of (Gain)/Loss Recognized in the Condensed Consolidated Statement of Operations | Three Months Ended March 31, | |||||||||||||||||||
| 2025 | 2024 | |||||||||||||||||||
| Derivatives not designated as hedges: | (Dollars in thousands) | |||||||||||||||||||
| Foreign currency derivatives | Cost of goods sold, other (income) expense, net | $ | (236) | $ | 127\u00a0 | |||||||||||||||
| March 31, 2025 | December 31, 2024 | ||||||||||
| \u00a0 | \u00a0\u00a0\u00a0Fair\u00a0Value | \u00a0\u00a0\u00a0Fair\u00a0Value | |||||||||
| (Dollars in thousands) | |||||||||||
| Prepaid and other current assets | |||||||||||
| Foreign currency derivatives | 237\u00a0 | 296\u00a0 | |||||||||
| Other accrued liabilities | |||||||||||
| Foreign currency derivatives | (43) | (248) | |||||||||
| Net asset | $ | 194\u00a0 | $ | 48\u00a0 |
| \u00a0 | March 31, 2025 | December 31, 2024 | |||||||||
| \u00a0 | (Dollars\u00a0in\u00a0thousands) | ||||||||||
| Foreign currency translation adjustments, net of tax | $ | (30,977) | $ | (43,573) | |||||||
| Foreign currency derivatives, net of tax | 164\u00a0 | 214\u00a0 | |||||||||
| Total accumulated other comprehensive loss | $ | (30,813) | $ | (43,359) |
| \u00a0 | March 31, 2025 | December 31, 2024 | |||||||||
| \u00a0 | (Dollars\u00a0in\u00a0thousands) | ||||||||||
| Foreign currency translation adjustments, net of tax | $ | (30,977) | $ | (43,573) | |||||||
| Foreign currency derivatives, net of tax | 164\u00a0 | 214\u00a0 | |||||||||
| Total accumulated other comprehensive loss | $ | (30,813) | $ | (43,359) |
| Three Months Ended \u00a0March 31, | |||||||||||
| 2025 | 2024 | ||||||||||
| (Dollars\u00a0in\u00a0thousands, except per share amounts) | |||||||||||
| Numerator for basic and diluted loss per share: | |||||||||||
| Net loss | $ | (39,351) | $ | (30,869) | |||||||
| Denominator: | |||||||||||
| Weighted average common shares outstanding for basic calculation | 258,369,101\u00a0 | 257,399,365\u00a0 | |||||||||
| Weighted average common shares outstanding for diluted calculation | 258,369,101\u00a0 | 257,399,365\u00a0 | |||||||||
| Basic loss per share | $ | (0.15) | $ | (0.12) | |||||||
| Diluted loss per share | $ | (0.15) | $ | (0.12) |
| Three Months Ended \u00a0March 31, | |||||||||||
| 2025 | 2024 | ||||||||||
| (Dollars\u00a0in\u00a0thousands, except per share amounts) | |||||||||||
| Numerator for basic and diluted loss per share: | |||||||||||
| Net loss | $ | (39,351) | $ | (30,869) | |||||||
| Denominator: | |||||||||||
| Weighted average common shares outstanding for basic calculation | 258,369,101\u00a0 | 257,399,365\u00a0 | |||||||||
| Weighted average common shares outstanding for diluted calculation | 258,369,101\u00a0 | 257,399,365\u00a0 | |||||||||
| Basic loss per share | $ | (0.15) | $ | (0.12) | |||||||
| Diluted loss per share | $ | (0.15) | $ | (0.12) |