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Preferred Share Issuance and Merger - Purchase Consideration (Details) - BCP IV GrafTech Holdings LP [Member] - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
Aug. 11, 2015
May. 18, 2015
Business Acquisition [Line Items]    
Amount   $ 854,337
Convertible preferred equity - Series A and B    
Business Acquisition [Line Items]    
Shares   150
Unit Price   $ 1,000,000
Amount $ 150,000 $ 150,000
Merger common equity - common shares    
Business Acquisition [Line Items]    
Shares   139,397
Unit Price   $ 5,050
Amount   $ 703,955
Net value of options    
Business Acquisition [Line Items]    
Amount   $ 382