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Preferred Share Issuance and Merger (Purchase Consideration) (Details) - BCP IV GrafTech Holdings LP [Member] - USD ($)	Aug. 11, 2015	May 18, 2015
Business Acquisition [Line Items]
Amount		$ 854,337,000
Convertible Preferred Stock [Member]
Business Acquisition [Line Items]
Number of Shares		150,000
Unit Price		$ 1,000,000.00
Amount	$ 150,000,000	$ 150,000,000
Common Stock [Member]
Business Acquisition [Line Items]
Number of Shares		139,397,000
Unit Price		$ 5,050.00
Amount		$ 703,955,000
Stock Options [Member]
Business Acquisition [Line Items]
Amount		$ 382,000

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- Definition

Number of shares of equity interests issued or issuable to acquire entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)(4)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477

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-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477

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