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Rationalizations Total Engeineered Solutions Rationalization and Related Charges (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Restructuring Cost and Reserve [Line Items] |  |  |
Rationalizations | $ 11,625,000 us-gaap_RestructuringAndRelatedCostIncurredCost | $ 20,156,000 us-gaap_RestructuringAndRelatedCostIncurredCost | $ 0 us-gaap_RestructuringAndRelatedCostIncurredCost
2014 Corporate and Research & Development Rationalization [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | 11,813,000 us-gaap_RestructuringCosts / us-gaap_RestructuringPlanAxis = gti_A2014CorporateandResearchDevelopmentRationalizationMember |  |
2014 Corporate and Research & Development Rationalization [Member] | Cost of Sales [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Accelerated depreciation (recorded in Cost of sales) | 20,000 us-gaap_RestructuringReserveAcceleratedDepreciation / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember / us-gaap_RestructuringPlanAxis = gti_A2014CorporateandResearchDevelopmentRationalizationMember |  |
Fixed Asset Write-offs and Other | 178,000 gti_RestructuringandRelatedCostFixedAssetWriteoffsandOther / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember / us-gaap_RestructuringPlanAxis = gti_A2014CorporateandResearchDevelopmentRationalizationMember |  |
2014 Corporate and Research & Development Rationalization [Member] | Selling, General and Administrative Expenses [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Accelerated depreciation (recorded in Cost of sales) | 608,000 us-gaap_RestructuringReserveAcceleratedDepreciation / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember / us-gaap_RestructuringPlanAxis = gti_A2014CorporateandResearchDevelopmentRationalizationMember |  |
Rationalizations | 515,000 us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember / us-gaap_RestructuringPlanAxis = gti_A2014CorporateandResearchDevelopmentRationalizationMember |  |
2014 Engineered Solutions Rationalization [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | 141,336,000 us-gaap_RestructuringCosts / us-gaap_RestructuringPlanAxis = gti_A2014EngineeredSolutionsRationalizationMember |  |
2014 Engineered Solutions Rationalization [Member] | Cost of Sales [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Accelerated depreciation (recorded in Cost of sales) | 2,802,000 us-gaap_RestructuringReserveAcceleratedDepreciation / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember / us-gaap_RestructuringPlanAxis = gti_A2014EngineeredSolutionsRationalizationMember |  |
Other (recorded in Cost of sales) | 13,225,000 us-gaap_OtherRestructuringCosts / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember / us-gaap_RestructuringPlanAxis = gti_A2014EngineeredSolutionsRationalizationMember |  |
2014 Engineered Solutions Rationalization [Member] | Rationalizations [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Severance and related charges (recorded in Rationalizations) | 2,498,000 us-gaap_SeveranceCosts1 / us-gaap_IncomeStatementLocationAxis = gti_RationalizationsMember / us-gaap_RestructuringPlanAxis = gti_A2014EngineeredSolutionsRationalizationMember |  |
Contract terminations and other (recorded in Rationalizations) | 195,000 gti_Restructuringandrelatedseveranceandcontractterminationcosts / us-gaap_IncomeStatementLocationAxis = gti_RationalizationsMember / us-gaap_RestructuringPlanAxis = gti_A2014EngineeredSolutionsRationalizationMember |  |
2014 Engineered Solutions Rationalization [Member] | Impairments [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Impairments (recorded in Impairments) | 121,570,000 gti_RestructuringCostsAssetImpairment / us-gaap_IncomeStatementLocationAxis = gti_ImpairmentsMember / us-gaap_RestructuringPlanAxis = gti_A2014EngineeredSolutionsRationalizationMember |  |
2013 Rationalization Initiatives [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Accelerated depreciation (recorded in Cost of sales) | 23,200,000 us-gaap_RestructuringReserveAcceleratedDepreciation / us-gaap_RestructuringPlanAxis = gti_A2013RationalizationInitiativesMember | 28,300,000 us-gaap_RestructuringReserveAcceleratedDepreciation / us-gaap_RestructuringPlanAxis = gti_A2013RationalizationInitiativesMember |
Rationalizations | 31,231,000 us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_RestructuringPlanAxis = gti_A2013RationalizationInitiativesMember | 65,701,000 us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_RestructuringPlanAxis = gti_A2013RationalizationInitiativesMember |
2013 Rationalization Initiatives [Member] | Cost of Sales [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Accelerated depreciation (recorded in Cost of sales) | 23,215,000 us-gaap_RestructuringReserveAcceleratedDepreciation / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember / us-gaap_RestructuringPlanAxis = gti_A2013RationalizationInitiativesMember | 28,326,000 us-gaap_RestructuringReserveAcceleratedDepreciation / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember / us-gaap_RestructuringPlanAxis = gti_A2013RationalizationInitiativesMember |
Fixed Asset Write-offs and Other | 5,607,000 gti_RestructuringandRelatedCostFixedAssetWriteoffsandOther / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember / us-gaap_RestructuringPlanAxis = gti_A2013RationalizationInitiativesMember | 8,378,000 gti_RestructuringandRelatedCostFixedAssetWriteoffsandOther / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember / us-gaap_RestructuringPlanAxis = gti_A2013RationalizationInitiativesMember |
2013 Rationalization Initiatives [Member] | Selling, General and Administrative Expenses [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Rationalizations | 89,000 us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember / us-gaap_RestructuringPlanAxis = gti_A2013RationalizationInitiativesMember | 59,000 us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember / us-gaap_RestructuringPlanAxis = gti_A2013RationalizationInitiativesMember |
Employee Severance [Member] | 2014 Corporate and Research & Development Rationalization [Member] | Rationalizations [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Rationalizations | 8,096,000 us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_IncomeStatementLocationAxis = gti_RationalizationsMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = gti_A2014CorporateandResearchDevelopmentRationalizationMember |  |
Employee Severance [Member] | 2013 Rationalization Initiatives [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Rationalizations |  | 20,200,000 us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = gti_A2013RationalizationInitiativesMember |
Employee Severance [Member] | 2013 Rationalization Initiatives [Member] | Rationalizations [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Rationalizations | 405,000 us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_IncomeStatementLocationAxis = gti_RationalizationsMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = gti_A2013RationalizationInitiativesMember | 19,346,000 us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_IncomeStatementLocationAxis = gti_RationalizationsMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = gti_A2013RationalizationInitiativesMember |
Special Termination Benefits [Member] | 2014 Corporate and Research & Development Rationalization [Member] | Rationalizations [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Rationalizations | 84,000 us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_IncomeStatementLocationAxis = gti_RationalizationsMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_SpecialTerminationBenefitsMember / us-gaap_RestructuringPlanAxis = gti_A2014CorporateandResearchDevelopmentRationalizationMember |  |
Special Termination Benefits [Member] | 2013 Rationalization Initiatives [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Rationalizations | 900,000 us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_RestructuringCostAndReserveAxis = us-gaap_SpecialTerminationBenefitsMember / us-gaap_RestructuringPlanAxis = gti_A2013RationalizationInitiativesMember |  |
Special Termination Benefits [Member] | 2013 Rationalization Initiatives [Member] | Rationalizations [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Rationalizations | $ 469,000 us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_IncomeStatementLocationAxis = gti_RationalizationsMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_SpecialTerminationBenefitsMember / us-gaap_RestructuringPlanAxis = gti_A2013RationalizationInitiativesMember | $ 810,000 us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_IncomeStatementLocationAxis = gti_RationalizationsMember / us-gaap_RestructuringCostAndReserveAxis = us-gaap_SpecialTerminationBenefitsMember / us-gaap_RestructuringPlanAxis = gti_A2013RationalizationInitiativesMember |

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- Definition Amount of other expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses 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 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 Discloses the amount charged against the accrued restructuring reserves, or earnings if not previously accrued, during the period for the specified type of 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 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 + Details
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- Definition Amount, after cash payment, 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 + Details
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- Definition Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, 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 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(10) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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