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Preferred Share Issuance and Merger (Details) - USD ($) |  |  | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Aug. 11, 2015 | May 18, 2015 | Sep. 30, 2015 | Sep. 30, 2016 | Dec. 31, 2015 | Aug. 15, 2015 | May 17, 2015
Goodwill |  |  |  | $ 171,117,000 | $ 172,059,000 |  |
Max Reimbursement to Acquiror |  |  | $ 500,000 |  |  |  |
Common Stock, Par or Stated Value Per Share |  |  |  |  |  |  | $ 0.01
Goodwill, Purchase Accounting Adjustments |  |  |  | 1,100,000 |  |  |
purchase price adjustment, deferred taxes |  |  |  | $ 2,000,000 |  |  |
Preferred Stock [Member] |  |  |  |  |  |  |
Convertible Preferred Stock, Conversion Price |  |  |  |  |  |  | $ 5.05
BCP IV GrafTech Holdings LP [Member] |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | $ 173,117,000 |
Amount |  | $ 854,337,000 |  |  |  |  |
Convertible Preferred Stock [Member] | BCP IV GrafTech Holdings LP [Member] |  |  |  |  |  |  |
Shares |  | 150,000 |  |  |  |  |
Amount | $ 150,000,000 | $ 150,000,000 |  |  |  |  |
Series A Preferred Stock [Member] | Convertible Preferred Stock [Member] | BCP IV GrafTech Holdings LP [Member] |  |  |  |  |  |  |
Shares |  | 136,616 |  |  |  |  |
Preferred stock, par value | $ 0.01 |  |  |  |  |  |
Business Combination, Equity Interest Transferred, Percentage of Common Stock Outstanding Before Transaction | 19.90% |  |  |  |  |  |
Series B Preferred Stock [Member] | Convertible Preferred Stock [Member] | BCP IV GrafTech Holdings LP [Member] |  |  |  |  |  |  |
Shares |  | 13,384 |  |  |  |  |
Preferred stock, par value | $ 0.01 |  |  |  |  |  |
Delayed draw term loan facility | Term Loan Facility |  |  |  |  |  |  |
Unused borrowing capacity | $ 40,000,000 |  |  |  |  |  |
Senior Notes | Senior Subordinated Notes Due Nov 2015 [Member] |  |  |  |  |  |  |
Early Repayment of Subordinated Debt | $ 200,000,000 |  |  |  |  |  |

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