| Cover | 12 Months Ended |
| Dec. 31, 2023 | |
| Document Information [Line Items] | |
| Document Type | PRE 14A |
| Amendment Flag | false |
| Entity Information [Line Items] | |
| Entity Registrant Name | GRAFTECH INTERNATIONAL LTD. |
| Entity Central Index Key | 0000931148 |
| Pay vs Performance Disclosure - USD ($) | 12 Months Ended | |||
| Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | |
| Pay vs Performance Disclosure | ||||
| Pay vs Performance Disclosure, Table | Pay Versus Performance Year Summary Compensation Table Total for PEO Flanagan (1) ($) Compensation Actually Paid to PEO Flanagan (1)(2) ($) Summary Compensation Table Total for Former PEO Kessler (3) ($) Compensation Actually Paid to Former PEO Kessler (3)(2) ($) Summary Compensation Table Total for Former PEO Rintoul (4) ($) Compensation Actually Paid to Former PEO Rintoul (4)(2) ($) Average Summary Compensation Table Total for Non-PEO Named Executive Officers (5) ($) Average Compensation Actually Paid to Non-PEO Named Executive Officers (5) (6) ($) Value of Initial Fixed $100 Investment Based On: Net (Loss) Income (in 000s) ($) Adjusted EBITDA (7) (in 000s) ($) GrafTech Total Stockholder Return NYSE Arca Steel Index (TR) Total Stockholder Return 2023 1,535,021 808,453 3,521,684 674,631 N/A N/A 1,423,584 727,028 $ 19 $ 238 (255,250 ) 20,484 2022 N/A N/A 1,407,268 1,153,710 1,406,150 1,405,993 1,538,305 1,097,819 $ 42 $ 179 382,962 536,464 2021 N/A N/A N/A N/A 3,445,257 4,377,435 6,471,272 6,656,296 $ 104 $ 156 388,330 669,940 2020 N/A N/A N/A N/A 2,433,525 2,691,429 1,146,426 1,248,844 $ 93 $ 121 434,374 658,946 (1) Mr. Flanagan was appointed Interim Chief Executive Officer and President as of November 15, 2023. Mr. Flanagan previously served as our Chief Financial Officer, Senior Vice President Finance and Treasurer since November 29, 2021. Our principle executive officer is referred to as the “PEO” in this disclosure. Mr. Flanagan was one of our PEOs during 2023. (2) “Compensation actually paid” to our Interim CEO and each of our former CEOs in each of 2023, 2022, 2021, and 2020 (each, a “Covered Year”), as applicable, reflects the respective amounts set forth in the table above, adjusted as set forth in the table below, as determined in accordance with SEC rules. The dollar amounts reflected in the table above do not necessarily reflect the actual amount of compensation earned by or paid to our Interim CEO or each of our former CEOs during the applicable year. For information regarding the decisions made by our Human Resources and Compensation Committee in regards to the Interim CEO’s and each of our former CEOs’ compensation for each fiscal year, please see the “ Compensation Discussion & Analysis 2020 2021 2022 2023 Rintoul Rintoul Rintoul Kessler Flanagan Kessler SCT Total Compensation $ 2,433,525 $ 3,445,257 $ 1,406,150 $ 1,407,268 $ 1,535,021 $ 3,521,684 Less: Stock Award Values Reported in SCT for the Covered Year $ (765,850 ) $ (1,170,960 ) — $ (446,112 ) $ (612,905 ) $ (2,005,011 ) Less: Option Award Values Reported in SCT for the Covered Year $ (259,307 ) $ (662,909 ) — $ (244,961 ) $ (130,866 ) $ (545,275 ) Plus: Covered Year-End $ 1,426,122 $ 903 $ 255 $ 437,515 $ 153,054 $ 421,261 Change in Fair Value (from Prior Year-End Year-End) $ 85,601 — $ (412 ) — $ (148,367 ) — Change in Fair Value (from Prior Year-End $ (145,001 ) $ 675,793 — — $ 12,515 $ 70,374 Fair Value as of Vesting Date for Stock and Option Awards Granted and Vested in the Covered Year $ (83,661 ) $ 2,089,351 — — — — Less: Prior Year-End — — — — — $ (788,402 ) Compensation Actually Paid $ 2,691,429 $ 4,377,435 $ 1,405,993 $ 1,153,710 $ 808,453 $ 674,631 (3) Mr. Kessler was one of our PEOs during each of 2023 and 2022. Mr. Kessler resigned from the Company as our Chief Executive Officer and President as of November 15, 2023. (4) Mr. David J. Rintoul was our PEO during 2020 and 2021, and one of our PEOs during 2022. Mr. Rintoul resigned from the Company as our Chief Executive Officer and President on June 30, 2022. (5) The identity of the non-PEO Year Non-PEO NEOs 2020 Quinn J. Coburn, Jeremy S. Halford, Iñigo Perez Ortiz, Gina K. Gunning 2021 Timothy K. Flanagan, Quinn J. Coburn, Jeremy S. Halford, Iñigo Perez Ortiz, Gina K. Gunning 2022 Timothy K. Flanagan, Jeremy S. Halford, Iñigo Perez Ortiz, Gina K. Gunning 2023 Catherine Hedoux-Delgado, Jeremy S. Halford, Iñigo Perez Ortiz, Gina K. Gunning (6) Average “compensation actually paid” for our non-PEO non-PEO non-PEO Compensation Discussion & Analysis 2020 2021 2022 2023 Non-PEO NEOs Non-PEO NEOs Non-PEO NEOs Non-PEO NEOs SCT Total Compensation $ 1,146,426 $ 6,471,272 $ 1,538,305 $ 1,423,584 Less: Stock Award Values Reported in SCT for the Covered Year $ (238,765 ) $ (334,400 ) $ (525,690 ) $ (547,345 ) Less: Option Award Values Reported in SCT for the Covered Year $ (80,843 ) $ (194,973 ) $ (228,750 ) $ (168,122 ) Plus: Covered Year-End $ 442,880 — $ 331,139 $ 138,925 Change in Fair Value (from Prior Year-End Year-End) $ 5,333 $ (1,126 ) $ (10,251 ) $ (130,762 ) Change in Fair Value (from Prior Year-End $ (26,400 ) $ 108,379 $ (6,934 ) $ 10,748 Fair Value as of Vesting Date for Stock and Option Awards Granted and Vested in the Covered Year $ 213 $ 617,144 — — Less: Prior Year-End — — — — Compensation Actually Paid $ 1,248,844 $ 6,656,296 $ 1,097,819 $ 727,028 (7) A non-GAAP Compensation Discussion and Analysis | |||
| Company Selected Measure Name | adjusted EBITDA | |||
| Named Executive Officers, Footnote | (5) The identity of the non-PEO Year Non-PEO NEOs 2020 Quinn J. Coburn, Jeremy S. Halford, Iñigo Perez Ortiz, Gina K. Gunning 2021 Timothy K. Flanagan, Quinn J. Coburn, Jeremy S. Halford, Iñigo Perez Ortiz, Gina K. Gunning 2022 Timothy K. Flanagan, Jeremy S. Halford, Iñigo Perez Ortiz, Gina K. Gunning 2023 Catherine Hedoux-Delgado, Jeremy S. Halford, Iñigo Perez Ortiz, Gina K. Gunning | |||
| Adjustment To PEO Compensation, Footnote | (2) “Compensation actually paid” to our Interim CEO and each of our former CEOs in each of 2023, 2022, 2021, and 2020 (each, a “Covered Year”), as applicable, reflects the respective amounts set forth in the table above, adjusted as set forth in the table below, as determined in accordance with SEC rules. The dollar amounts reflected in the table above do not necessarily reflect the actual amount of compensation earned by or paid to our Interim CEO or each of our former CEOs during the applicable year. For information regarding the decisions made by our Human Resources and Compensation Committee in regards to the Interim CEO’s and each of our former CEOs’ compensation for each fiscal year, please see the “ Compensation Discussion & Analysis 2020 2021 2022 2023 Rintoul Rintoul Rintoul Kessler Flanagan Kessler SCT Total Compensation $ 2,433,525 $ 3,445,257 $ 1,406,150 $ 1,407,268 $ 1,535,021 $ 3,521,684 Less: Stock Award Values Reported in SCT for the Covered Year $ (765,850 ) $ (1,170,960 ) — $ (446,112 ) $ (612,905 ) $ (2,005,011 ) Less: Option Award Values Reported in SCT for the Covered Year $ (259,307 ) $ (662,909 ) — $ (244,961 ) $ (130,866 ) $ (545,275 ) Plus: Covered Year-End $ 1,426,122 $ 903 $ 255 $ 437,515 $ 153,054 $ 421,261 Change in Fair Value (from Prior Year-End Year-End) $ 85,601 — $ (412 ) — $ (148,367 ) — Change in Fair Value (from Prior Year-End $ (145,001 ) $ 675,793 — — $ 12,515 $ 70,374 Fair Value as of Vesting Date for Stock and Option Awards Granted and Vested in the Covered Year $ (83,661 ) $ 2,089,351 — — — — Less: Prior Year-End — — — — — $ (788,402 ) Compensation Actually Paid $ 2,691,429 $ 4,377,435 $ 1,405,993 $ 1,153,710 $ 808,453 $ 674,631 | |||
| Non-PEO NEO Average Total Compensation Amount | $ 1,423,584 | $ 1,538,305 | $ 6,471,272 | $ 1,146,426 |
| Non-PEO NEO Average Compensation Actually Paid Amount | $ 727,028 | 1,097,819 | 6,656,296 | 1,248,844 |
| Adjustment to Non-PEO NEO Compensation Footnote | (6) Average “compensation actually paid” for our non-PEO non-PEO non-PEO Compensation Discussion & Analysis 2020 2021 2022 2023 Non-PEO NEOs Non-PEO NEOs Non-PEO NEOs Non-PEO NEOs SCT Total Compensation $ 1,146,426 $ 6,471,272 $ 1,538,305 $ 1,423,584 Less: Stock Award Values Reported in SCT for the Covered Year $ (238,765 ) $ (334,400 ) $ (525,690 ) $ (547,345 ) Less: Option Award Values Reported in SCT for the Covered Year $ (80,843 ) $ (194,973 ) $ (228,750 ) $ (168,122 ) Plus: Covered Year-End $ 442,880 — $ 331,139 $ 138,925 Change in Fair Value (from Prior Year-End Year-End) $ 5,333 $ (1,126 ) $ (10,251 ) $ (130,762 ) Change in Fair Value (from Prior Year-End $ (26,400 ) $ 108,379 $ (6,934 ) $ 10,748 Fair Value as of Vesting Date for Stock and Option Awards Granted and Vested in the Covered Year $ 213 $ 617,144 — — Less: Prior Year-End — — — — Compensation Actually Paid $ 1,248,844 $ 6,656,296 $ 1,097,819 $ 727,028 | |||
| Compensation Actually Paid vs. Total Shareholder Return | ||||
| Compensation Actually Paid vs. Net Income | ||||
| Compensation Actually Paid vs. Company Selected Measure | ||||
| Tabular List, Table | Tabular List of Performance Measures Listed below are the performance measures that in our assessment represent the most important performance measures used by us to link compensation actually paid to our named executive officers for 2023 to Company performance. Performance Measure Nature Explanation Adjusted EBITDA Financial Measure A non-GAAP Adjusted Free Cash Flow Financial Measure A non-GAAP Relative Total Shareholder Return Financial Measure Our PSUs are based on our relative total shareholder return achievement, with total shareholder return (measured by stock performance price and any dividends reinvested) for us compared against that for a peer group. | |||
| Total Shareholder Return Amount | $ 19 | 42 | 104 | 93 |
| Peer Group Total Shareholder Return Amount | 238 | 179 | 156 | 121 |
| Net Income (Loss) | $ (255,250,000) | $ 382,962,000 | $ 388,330,000 | $ 434,374,000 |
| Company Selected Measure Amount | 20,484,000 | 536,464,000 | 669,940,000 | 658,946,000 |
| Measure:: 1 | ||||
| Pay vs Performance Disclosure | ||||
| Name | Adjusted EBITDA | |||
| Non-GAAP Measure Description | A non-GAAP | |||
| Measure:: 2 | ||||
| Pay vs Performance Disclosure | ||||
| Name | Adjusted Free Cash Flow | |||
| Measure:: 3 | ||||
| Pay vs Performance Disclosure | ||||
| Name | Relative Total Shareholder Return | |||
| Stock Award Values Reported in SCT for the Covered Year [Member] | ||||
| Pay vs Performance Disclosure | ||||
| Adjustment to Compensation, Amount | $ (547,345) | $ (525,690) | $ (334,400) | $ (238,765) |
| Option Award Values Reported in SCT for the Covered Year [Member] | ||||
| Pay vs Performance Disclosure | ||||
| Adjustment to Compensation, Amount | (168,122) | (228,750) | (194,973) | (80,843) |
| Covered Year End Fair Value for Stock and Option Awards Granted in the Covered Year [Member] | ||||
| Pay vs Performance Disclosure | ||||
| Adjustment to Compensation, Amount | 138,925 | 331,139 | 442,880 | |
| Change in Fair Value (from Prior Year End to Covered Year End) of Outstanding Unvested Stock and Option Awards Granted Prior to Covered Year [Member] | ||||
| Pay vs Performance Disclosure | ||||
| Adjustment to Compensation, Amount | (130,762) | (10,251) | (1,126) | 5,333 |
| Change in Fair Value (from Prior Year End to Vesting Date) of Stock and Option Awards Granted Prior to Covered Year that Vested in the Covered Year [Member] | ||||
| Pay vs Performance Disclosure | ||||
| Adjustment to Compensation, Amount | 10,748 | (6,934) | 108,379 | (26,400) |
| Fair Value as of Vesting Date for Stock and Option Awards Granted and Vested in the Covered Year [Member] | ||||
| Pay vs Performance Disclosure | ||||
| Adjustment to Compensation, Amount | 617,144 | 213 | ||
| Flanagan [Member] | ||||
| Pay vs Performance Disclosure | ||||
| PEO Total Compensation Amount | 1,535,021 | |||
| PEO Actually Paid Compensation Amount | $ 808,453 | |||
| PEO Name | Mr. Flanagan | |||
| Flanagan [Member] | Stock Award Values Reported in SCT for the Covered Year [Member] | ||||
| Pay vs Performance Disclosure | ||||
| Adjustment to Compensation, Amount | $ (612,905) | |||
| Flanagan [Member] | Option Award Values Reported in SCT for the Covered Year [Member] | ||||
| Pay vs Performance Disclosure | ||||
| Adjustment to Compensation, Amount | (130,866) | |||
| Flanagan [Member] | Covered Year End Fair Value for Stock and Option Awards Granted in the Covered Year [Member] | ||||
| Pay vs Performance Disclosure | ||||
| Adjustment to Compensation, Amount | 153,054 | |||
| Flanagan [Member] | Change in Fair Value (from Prior Year End to Covered Year End) of Outstanding Unvested Stock and Option Awards Granted Prior to Covered Year [Member] | ||||
| Pay vs Performance Disclosure | ||||
| Adjustment to Compensation, Amount | (148,367) | |||
| Flanagan [Member] | Change in Fair Value (from Prior Year End to Vesting Date) of Stock and Option Awards Granted Prior to Covered Year that Vested in the Covered Year [Member] | ||||
| Pay vs Performance Disclosure | ||||
| Adjustment to Compensation, Amount | 12,515 | |||
| Kessler [Member] | ||||
| Pay vs Performance Disclosure | ||||
| PEO Total Compensation Amount | 3,521,684 | 1,407,268 | ||
| PEO Actually Paid Compensation Amount | $ 674,631 | 1,153,710 | ||
| PEO Name | Mr. Kessler | |||
| Kessler [Member] | Stock Award Values Reported in SCT for the Covered Year [Member] | ||||
| Pay vs Performance Disclosure | ||||
| Adjustment to Compensation, Amount | $ (2,005,011) | (446,112) | ||
| Kessler [Member] | Option Award Values Reported in SCT for the Covered Year [Member] | ||||
| Pay vs Performance Disclosure | ||||
| Adjustment to Compensation, Amount | (545,275) | (244,961) | ||
| Kessler [Member] | Covered Year End Fair Value for Stock and Option Awards Granted in the Covered Year [Member] | ||||
| Pay vs Performance Disclosure | ||||
| Adjustment to Compensation, Amount | 421,261 | 437,515 | ||
| Kessler [Member] | Change in Fair Value (from Prior Year End to Vesting Date) of Stock and Option Awards Granted Prior to Covered Year that Vested in the Covered Year [Member] | ||||
| Pay vs Performance Disclosure | ||||
| Adjustment to Compensation, Amount | 70,374 | |||
| Kessler [Member] | Fair Value of Stock and Option Awards Forfeited in the Covered Year [Member] | ||||
| Pay vs Performance Disclosure | ||||
| Adjustment to Compensation, Amount | $ (788,402) | |||
| David J. Rintoul [Member] | ||||
| Pay vs Performance Disclosure | ||||
| PEO Total Compensation Amount | 1,406,150 | 3,445,257 | 2,433,525 | |
| PEO Actually Paid Compensation Amount | 1,405,993 | 4,377,435 | 2,691,429 | |
| PEO Name | Mr. David J. Rintoul | |||
| David J. Rintoul [Member] | Stock Award Values Reported in SCT for the Covered Year [Member] | ||||
| Pay vs Performance Disclosure | ||||
| Adjustment to Compensation, Amount | (1,170,960) | (765,850) | ||
| David J. Rintoul [Member] | Option Award Values Reported in SCT for the Covered Year [Member] | ||||
| Pay vs Performance Disclosure | ||||
| Adjustment to Compensation, Amount | (662,909) | (259,307) | ||
| David J. Rintoul [Member] | Covered Year End Fair Value for Stock and Option Awards Granted in the Covered Year [Member] | ||||
| Pay vs Performance Disclosure | ||||
| Adjustment to Compensation, Amount | 255 | 903 | 1,426,122 | |
| David J. Rintoul [Member] | Change in Fair Value (from Prior Year End to Covered Year End) of Outstanding Unvested Stock and Option Awards Granted Prior to Covered Year [Member] | ||||
| Pay vs Performance Disclosure | ||||
| Adjustment to Compensation, Amount | $ (412) | 85,601 | ||
| David J. Rintoul [Member] | Change in Fair Value (from Prior Year End to Vesting Date) of Stock and Option Awards Granted Prior to Covered Year that Vested in the Covered Year [Member] | ||||
| Pay vs Performance Disclosure | ||||
| Adjustment to Compensation, Amount | 675,793 | (145,001) | ||
| David J. Rintoul [Member] | Fair Value as of Vesting Date for Stock and Option Awards Granted and Vested in the Covered Year [Member] | ||||
| Pay vs Performance Disclosure | ||||
| Adjustment to Compensation, Amount | $ 2,089,351 | $ (83,661) | ||
