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Rationalizations and Impairments (Rationalization-Roll-forward) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014
2013 Rationalization Initiatives |  |
Restructuring Reserve [Roll Forward] |  |
Beginning balance | $ 1,035 us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = gti_A2013RationalizationInitiativesMember | $ 18,421 us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = gti_A2013RationalizationInitiativesMember
Charges incurred | 0 us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = gti_A2013RationalizationInitiativesMember | 613 us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = gti_A2013RationalizationInitiativesMember
Change in estimates | (112)us-gaap_RestructuringReserveAccrualAdjustment / us-gaap_RestructuringPlanAxis = gti_A2013RationalizationInitiativesMember | (153)us-gaap_RestructuringReserveAccrualAdjustment / us-gaap_RestructuringPlanAxis = gti_A2013RationalizationInitiativesMember
Payments and settlements | (549)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringPlanAxis = gti_A2013RationalizationInitiativesMember | (16,494)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringPlanAxis = gti_A2013RationalizationInitiativesMember
Effect of change in currency exchange rates | (108)us-gaap_RestructuringReserveTranslationAdjustment / us-gaap_RestructuringPlanAxis = gti_A2013RationalizationInitiativesMember | (1,658)us-gaap_RestructuringReserveTranslationAdjustment / us-gaap_RestructuringPlanAxis = gti_A2013RationalizationInitiativesMember
Ending balance | 490 us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = gti_A2013RationalizationInitiativesMember | 1,035 us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = gti_A2013RationalizationInitiativesMember
2014 Engineered Solutions Rationalization |  |
Restructuring Reserve [Roll Forward] |  |
Beginning balance | 1,655 us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = gti_A2014EngineeredSolutionsRationalizationMember | 0 us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = gti_A2014EngineeredSolutionsRationalizationMember
Charges incurred | 50 us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = gti_A2014EngineeredSolutionsRationalizationMember | 2,611 us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = gti_A2014EngineeredSolutionsRationalizationMember
Change in estimates | (16)us-gaap_RestructuringReserveAccrualAdjustment / us-gaap_RestructuringPlanAxis = gti_A2014EngineeredSolutionsRationalizationMember | (40)us-gaap_RestructuringReserveAccrualAdjustment / us-gaap_RestructuringPlanAxis = gti_A2014EngineeredSolutionsRationalizationMember
Payments and settlements | (434)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringPlanAxis = gti_A2014EngineeredSolutionsRationalizationMember | (916)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringPlanAxis = gti_A2014EngineeredSolutionsRationalizationMember
Ending balance | 1,255 us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = gti_A2014EngineeredSolutionsRationalizationMember | 1,655 us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = gti_A2014EngineeredSolutionsRationalizationMember
2014 Corporate and Research & Development Rationalization |  |
Restructuring Reserve [Roll Forward] |  |
Beginning balance | 6,873 us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = gti_A2014CorporateandResearchDevelopmentRationalizationMember | 0 us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = gti_A2014CorporateandResearchDevelopmentRationalizationMember
Charges incurred | (2)us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = gti_A2014CorporateandResearchDevelopmentRationalizationMember | 8,159 us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = gti_A2014CorporateandResearchDevelopmentRationalizationMember
Change in estimates | 34 us-gaap_RestructuringReserveAccrualAdjustment / us-gaap_RestructuringPlanAxis = gti_A2014CorporateandResearchDevelopmentRationalizationMember | (21)us-gaap_RestructuringReserveAccrualAdjustment / us-gaap_RestructuringPlanAxis = gti_A2014CorporateandResearchDevelopmentRationalizationMember
Payments and settlements | (2,231)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringPlanAxis = gti_A2014CorporateandResearchDevelopmentRationalizationMember | (1,155)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringPlanAxis = gti_A2014CorporateandResearchDevelopmentRationalizationMember
Effect of change in currency exchange rates | (48)us-gaap_RestructuringReserveTranslationAdjustment / us-gaap_RestructuringPlanAxis = gti_A2014CorporateandResearchDevelopmentRationalizationMember | (152)us-gaap_RestructuringReserveTranslationAdjustment / us-gaap_RestructuringPlanAxis = gti_A2014CorporateandResearchDevelopmentRationalizationMember
Ending balance | 4,558 us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = gti_A2014CorporateandResearchDevelopmentRationalizationMember | 6,873 us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = gti_A2014CorporateandResearchDevelopmentRationalizationMember
2015 Advanced Graphite Materials Rationalization |  |
Restructuring Reserve [Roll Forward] |  |
Beginning balance | 0 us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = gti_A2015AdvancedGraphiteMaterialsRationalizationMember |
Charges incurred | 2,382 us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = gti_A2015AdvancedGraphiteMaterialsRationalizationMember |
Payments and settlements | (17)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringPlanAxis = gti_A2015AdvancedGraphiteMaterialsRationalizationMember |
Ending balance | $ 2,329 us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = gti_A2015AdvancedGraphiteMaterialsRationalizationMember |

X
- 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=56944662&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=56944662&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 (expense) reversal of expense related to a previously accrued restructuring cost liability. Excludes adjustments for costs incurred, costs settled, 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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- Definition Amount of gain (loss) from translating a restructuring reserve to the currency of the reporting entity from an amount denominated or measured in a different currency. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 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)(2) -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)(2)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 + Details
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