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Rationalizations and Impairments (Narrative) (Details) (USD $) | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 0 Months Ended
--- | --- | --- | --- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2014 | Sep. 30, 2014 | Dec. 31, 2015 | Mar. 02, 2015 employee
2013 Rationalization Initiatives |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Expected cash outlay | $ 549,000 us-gaap_PaymentsForRestructuring / us-gaap_RestructuringPlanAxis = gti_A2013RationalizationInitiativesMember | $ 16,494,000 us-gaap_PaymentsForRestructuring / us-gaap_RestructuringPlanAxis = gti_A2013RationalizationInitiativesMember |  |  |  |
Industrial Materials Segment |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Estimated reduction in capacity (metric tons) | 60,000 gti_EstimatedReductioninCapacity / us-gaap_RestructuringPlanAxis = gti_A2013IndustrialMaterialsRationalizationMember |  |  |  |  |
Expected number of positions eliminated (employees) | 600 us-gaap_RestructuringAndRelatedCostExpectedNumberOfPositionsEliminated / us-gaap_RestructuringPlanAxis = gti_A2013IndustrialMaterialsRationalizationMember |  |  |  |  |
Number of positions eliminated (percent) |  |  | 20.00%us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminatedPeriodPercent / us-gaap_RestructuringPlanAxis = gti_A2013IndustrialMaterialsRationalizationMember |  |  |
Engineered Solutions Segment |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Expected number of positions eliminated (employees) | 40 us-gaap_RestructuringAndRelatedCostExpectedNumberOfPositionsEliminated / us-gaap_RestructuringPlanAxis = gti_A2013EngineeredSolutionsRationalizationMember |  |  |  |  |
2014 Engineered Solutions Rationalization |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Expected cash outlay | 434,000 us-gaap_PaymentsForRestructuring / us-gaap_RestructuringPlanAxis = gti_A2014EngineeredSolutionsRationalizationMember | 916,000 us-gaap_PaymentsForRestructuring / us-gaap_RestructuringPlanAxis = gti_A2014EngineeredSolutionsRationalizationMember |  |  |  |
2014 Corporate and Research & Development Rationalization |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Number of positions eliminated (percent) |  |  |  | 25.00%us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminatedPeriodPercent / us-gaap_RestructuringPlanAxis = gti_A2014CorporateandResearchDevelopmentRationalizationMember |  |
Expected cost |  |  |  | 20,000,000 us-gaap_RestructuringAndRelatedCostExpectedCost1 / us-gaap_RestructuringPlanAxis = gti_A2014CorporateandResearchDevelopmentRationalizationMember |  |
Expected cash outlay | 2,231,000 us-gaap_PaymentsForRestructuring / us-gaap_RestructuringPlanAxis = gti_A2014CorporateandResearchDevelopmentRationalizationMember | 1,155,000 us-gaap_PaymentsForRestructuring / us-gaap_RestructuringPlanAxis = gti_A2014CorporateandResearchDevelopmentRationalizationMember |  |  |  |
2014 Corporate and Research & Development Rationalization | Scenario, Plan |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Expected cash outlay |  |  |  |  | 12,000,000 us-gaap_PaymentsForRestructuring / us-gaap_RestructuringPlanAxis = gti_A2014CorporateandResearchDevelopmentRationalizationMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPlanMember |
2015 Advanced Graphite Materials Rationalization |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Expected number of positions eliminated (employees) |  |  |  |  |  | 85 us-gaap_RestructuringAndRelatedCostExpectedNumberOfPositionsEliminated / us-gaap_RestructuringPlanAxis = gti_A2015AdvancedGraphiteMaterialsRationalizationMember
Expected cost |  |  |  |  |  | 10,000,000 us-gaap_RestructuringAndRelatedCostExpectedCost1 / us-gaap_RestructuringPlanAxis = gti_A2015AdvancedGraphiteMaterialsRationalizationMember
Expected cash outlay | 17,000 us-gaap_PaymentsForRestructuring / us-gaap_RestructuringPlanAxis = gti_A2015AdvancedGraphiteMaterialsRationalizationMember |  |  |  |  |
2015 Advanced Graphite Materials Rationalization | Scenario, Plan |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Expected cash outlay |  |  |  |  | $ 8,000,000 us-gaap_PaymentsForRestructuring / us-gaap_RestructuringPlanAxis = gti_A2015AdvancedGraphiteMaterialsRationalizationMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPlanMember |

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- Definition Estimated Reduction in Capacity + References No definition available. + Details
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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=56944662&loc=d3e3602-108585 + Details
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- Definition Amount expected to be recognized in earnings for the specified restructuring cost. + 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 SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 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 + Details
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- Definition The expected number of positions to be eliminated as a result of restructuring activities. + References No definition available. + Details
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- Definition The number of positions eliminated during the period as a percentage of total positions eliminated during the period in connection with the restructuring plan(s). + References No definition available. + Details
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