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Preferred Share Issuance and Merger (Details) - USD ($) $ / shares in Units, shares in Thousands			3 Months Ended
	Aug. 11, 2015	May. 18, 2015	Sep. 30, 2015	May. 17, 2015	Dec. 31, 2014
Goodwill			$ 170,021,000		$ 420,129,000
Preferred stock, par value			$ 0.01		$ 0.01
Max Reimbursement to Acquiror			$ 500,000
Common Stock, Par or Stated Value Per Share			$ 0.01	$ 0.01	$ 0.01
Preferred Stock [Member]
Convertible Preferred Stock, Conversion Price				$ 5.05
BCP IV GrafTech Holdings LP [Member]
Goodwill		$ 170,418,000
Amount		$ 854,337,000
Convertible Preferred Stock [Member] | BCP IV GrafTech Holdings LP [Member]
Shares		150
Amount	$ 150,000,000	$ 150,000,000
Series A Preferred Stock [Member] | Convertible Preferred Stock [Member] | BCP IV GrafTech Holdings LP [Member]
Shares		137
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
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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