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Rationalizations Rationalization Costs Incurred (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2012 | Dec. 31, 2013
Restructuring Reserve [Roll Forward] |  |  |
Restructuring Reserve | $ 18,421 us-gaap_RestructuringReserve |  |
Charges incurred | 613 us-gaap_RestructuringCharges | 16,159 us-gaap_RestructuringCharges |
Change in estimates | (153)us-gaap_RestructuringReserveAccrualAdjustment | (3,997)us-gaap_RestructuringReserveAccrualAdjustment |
Payments and settlements | (16,494)us-gaap_PaymentsForRestructuring | (1,506)us-gaap_PaymentsForRestructuring |
Effect of change in currency exchange rates | (1,658)us-gaap_RestructuringReserveTranslationAdjustment | (229)us-gaap_RestructuringReserveTranslationAdjustment |
Restructuring Reserve | 1,035 us-gaap_RestructuringReserve | 0 us-gaap_RestructuringReserve |
2014 Engineered Solutions Rationalization [Member] |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring Reserve |  |  | 1,655 us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = gti_A2014EngineeredSolutionsRationalizationMember
Charges incurred |  | 2,611 us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = gti_A2014EngineeredSolutionsRationalizationMember |
Change in estimates |  | (40)us-gaap_RestructuringReserveAccrualAdjustment / us-gaap_RestructuringPlanAxis = gti_A2014EngineeredSolutionsRationalizationMember |
Payments and settlements |  | (916)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringPlanAxis = gti_A2014EngineeredSolutionsRationalizationMember |
Effect of change in currency exchange rates |  | 0 us-gaap_RestructuringReserveTranslationAdjustment / us-gaap_RestructuringPlanAxis = gti_A2014EngineeredSolutionsRationalizationMember |
Restructuring Reserve |  | 0 us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = gti_A2014EngineeredSolutionsRationalizationMember | 1,655 us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = gti_A2014EngineeredSolutionsRationalizationMember
2014 Corporate and Research & Development Rationalization [Member] |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring Reserve | 0 us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = gti_A2014CorporateandResearchDevelopmentRationalizationMember |  |
Charges incurred | 8,159 us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = gti_A2014CorporateandResearchDevelopmentRationalizationMember |  |
Change in estimates | (21)us-gaap_RestructuringReserveAccrualAdjustment / us-gaap_RestructuringPlanAxis = gti_A2014CorporateandResearchDevelopmentRationalizationMember |  |
Payments and settlements | (1,155)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringPlanAxis = gti_A2014CorporateandResearchDevelopmentRationalizationMember |  |
Effect of change in currency exchange rates | (152)us-gaap_RestructuringReserveTranslationAdjustment / us-gaap_RestructuringPlanAxis = gti_A2014CorporateandResearchDevelopmentRationalizationMember |  |
Restructuring Reserve | $ 6,873 us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = gti_A2014CorporateandResearchDevelopmentRationalizationMember |  |

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- Definition Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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- Definition Amount of any reversal and other adjustment made during the period to the amount of a previously accrued liability for a specified type of restructuring cost, excluding adjustments for costs incurred during the period, costs settled during the period, and foreign currency translation adjustments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 40 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6394291&loc=d3e17658-110867 + Details
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