Organization And Summary Of Significant Accounting Policies (Policy)	6 Months Ended
Jun. 30, 2013
Accounting Policies [Abstract]
Basis Of Presentation	A. Organization GrafTech International Ltd. is one of the world’s largest manufacturers and providers of high quality synthetic and natural graphite and carbon based products. References herein to “GTI,” “we,” “our,” or “us” refer collectively to GrafTech International Ltd. and its subsidiaries. We have seven major product categories: graphite electrodes, refractory products, needle coke products, advanced electronics technologies, advanced graphite materials, advanced composite materials and advanced materials, which are reported in the following segments: Industrial Materials includes graphite electrodes, refractory products, and needle coke products, and primarily serves the steel industry. Engineered Solutions includes advanced electronics technologies, advanced graphite materials, advanced composite materials and advanced materials, and provides primary and specialty products to the advanced electronics, industrial, energy, transportation and defense industries. B. Basis of Presentation The interim Consolidated Financial Statements are unaudited; however, in the opinion of management, they have been prepared in accordance with Rule 10-01 of Regulation S-X and in accordance with accounting principles generally accepted in the United States of America (“GAAP”). December 31, 2012 financial position data included herein was derived from the audited consolidated financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2012 (the “Annual Report”) but does not include all disclosures required by GAAP. These interim Consolidated Financial Statements should be read in conjunction with the audited Consolidated Financial Statements, including the accompanying Notes, contained in the Annual Report. The unaudited consolidated financial statements reflect all adjustments (all of which are of a normal, recurring nature) which management considers necessary for a fair statement of financial position, results of operations, comprehensive income and cash flows for the interim period presented. The results for the interim periods are not necessarily indicative of results which may be expected for any other interim period or for the full year. Certain amounts previously reported have been reclassified to conform to the current year presentation. During the three months ended June 30, 2013, the Company recorded additional depreciation expense of $2.9 million ($1.9 million net of tax), to correct certain errors related to prior periods. The impact to the six months ended June 30, 2013 was a net $2.7 million of additional expense ($1.8 million, net of tax). These charges were recorded primarily to release to cost of sales depreciation expenses that were previously incorrectly deferred to inventory. These adjustments were not material to any previously issued or the expected full year 2013 financial statements. C. New Accounting Standards In February 2013, the FASB issued guidance on reporting of amounts reclassified out of accumulated other comprehensive income (“AOCI”). The guidance requires an entity to provide information about the amounts reclassified out of AOCI by component. In addition, an entity is required to present, either on the face of the statement where net income is presented or in the notes, significant amounts reclassified out of AOCI by the respective line items of net income, but only if the amount reclassified is required under GAAP to be reclassified to net income in its entirety in the same reporting period. We disclose our reclassifications within Note 14 "Derivative Instruments", as these are the only material reclassifications out of AOCI. This guidance was adopted by the Company retrospectively as of January 1, 2013. As the accounting standard only impacts disclosures, the new standard does not have an impact on the Company's financial position, results of operations, or cash flows.

A. Organization

GrafTech International Ltd. is one of the world’s largest manufacturers and providers of high quality synthetic and natural graphite and carbon based products. References herein to “GTI,” “we,” “our,” or “us” refer collectively to GrafTech International Ltd. and its subsidiaries. We have seven major product categories: graphite electrodes, refractory products, needle coke products, advanced electronics technologies, advanced graphite materials, advanced composite materials and advanced materials, which are reported in the following segments:

Industrial Materials includes graphite electrodes, refractory products, and needle coke products, and primarily serves the steel industry.

Engineered Solutions includes advanced electronics technologies, advanced graphite materials, advanced composite materials and advanced materials, and provides primary and specialty products to the advanced electronics, industrial, energy, transportation and defense industries.

B. Basis of Presentation

The interim Consolidated Financial Statements are unaudited; however, in the opinion of management, they have been prepared in accordance with Rule 10-01 of Regulation S-X and in accordance with accounting principles generally accepted in the United States of America (“GAAP”). December 31, 2012 financial position data included herein was derived from the audited consolidated financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2012 (the “Annual Report”) but does not include all disclosures required by GAAP. These interim Consolidated Financial Statements should be read in conjunction with the audited Consolidated Financial Statements, including the accompanying Notes, contained in the Annual Report.

The unaudited consolidated financial statements reflect all adjustments (all of which are of a normal, recurring nature) which management considers necessary for a fair statement of financial position, results of operations, comprehensive income and cash flows for the interim period presented. The results for the interim periods are not necessarily indicative of results which may be expected for any other interim period or for the full year. Certain amounts previously reported have been reclassified to conform to the current year presentation.

During the three months ended June 30, 2013, the Company recorded additional depreciation expense of $2.9 million ($1.9 million net of tax), to correct certain errors related to prior periods. The impact to the six months ended June 30, 2013 was a net $2.7 million of additional expense ($1.8 million, net of tax). These charges were recorded primarily to release to cost of sales depreciation expenses that were previously incorrectly deferred to inventory. These adjustments were not material to any previously issued or the expected full year 2013 financial statements.

C. New Accounting Standards

In February 2013, the FASB issued guidance on reporting of amounts reclassified out of accumulated other comprehensive income (“AOCI”). The guidance requires an entity to provide information about the amounts reclassified out of AOCI by component. In addition, an entity is required to present, either on the face of the statement where net income is presented or in the notes, significant amounts reclassified out of AOCI by the respective line items of net income, but only if the amount reclassified is required under GAAP to be reclassified to net income in its entirety in the same reporting period. We disclose our reclassifications within Note 14 "Derivative Instruments", as these are the only material reclassifications out of AOCI. This guidance was adopted by the Company retrospectively as of January 1, 2013. As the accounting standard only impacts disclosures, the new standard does not have an impact on the Company's financial position, results of operations, or cash flows.