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Business And Summary Of Significant Accounting Policies (Narrative) (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Business And Summary Of Significant Accounting Policies [Line Items] |  |  |
Depreciation expense | $ 100,400,000 us-gaap_Depreciation | $ 102,900,000 us-gaap_Depreciation | $ 59,600,000 us-gaap_Depreciation
Capitalized bank fees | 9,700,000 gti_CapitalizedBankFeesUponIncurrenceOfDebt | 9,800,000 gti_CapitalizedBankFeesUponIncurrenceOfDebt |
Amortization of capitalized bank fees | 3,339,000 us-gaap_AmortizationOfFinancingCosts | 2,504,000 us-gaap_AmortizationOfFinancingCosts | 1,712,000 us-gaap_AmortizationOfFinancingCosts
Environmental remediation, compliance and management expenses | 17,000,000 us-gaap_EnvironmentalRemediationExpense | 14,600,000 us-gaap_EnvironmentalRemediationExpense | 15,800,000 us-gaap_EnvironmentalRemediationExpense
Accrued liability relating to environmental remediation | 6,900,000 us-gaap_AccrualForEnvironmentalLossContingenciesProvisionForNewLosses | 7,000,000 us-gaap_AccrualForEnvironmentalLossContingenciesProvisionForNewLosses |
Total costs capitalized | 15,600,000 us-gaap_CapitalizedSoftwareDevelopmentCostsForSoftwareSoldToCustomers | 17,800,000 us-gaap_CapitalizedSoftwareDevelopmentCostsForSoftwareSoldToCustomers |
Amortization expense | 500,000 us-gaap_CapitalizedComputerSoftwareAmortization | 1,000,000 us-gaap_CapitalizedComputerSoftwareAmortization | 1,400,000 us-gaap_CapitalizedComputerSoftwareAmortization
Deferred costs | 13,300,000 us-gaap_OtherDeferredCostsGross | 7,500,000 us-gaap_OtherDeferredCostsGross |
Amortized costs | 6,600,000 us-gaap_AccumulatedAmortizationOfOtherDeferredCosts | 7,800,000 us-gaap_AccumulatedAmortizationOfOtherDeferredCosts |
Quantifying Misstatement in Current Year Financial Statements, Amount | 2,700,000 us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsAmount |  |
Quantifying Misstatement of Current Year Financial Statements, Amount Net of Tax | 1,800,000 gti_QuantifyingMisstatementOfCurrentYearFinancialStatementsAmountNetOfTax |  |
Capitalized Bank Fees [Member] |  |  |
Business And Summary Of Significant Accounting Policies [Line Items] |  |  |
Amortization of capitalized bank fees | $ 3,300,000 us-gaap_AmortizationOfFinancingCosts / us-gaap_IncomeStatementLocationAxis = gti_CapitalizedBankFeesMember | $ 2,500,000 us-gaap_AmortizationOfFinancingCosts / us-gaap_IncomeStatementLocationAxis = gti_CapitalizedBankFeesMember | $ 1,700,000 us-gaap_AmortizationOfFinancingCosts / us-gaap_IncomeStatementLocationAxis = gti_CapitalizedBankFeesMember

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- Definition The amount added to the accrual for newly incurred environmental loss contingencies. These additions include remediation expense and interest accretion. These additions do not relate to changes in the environmental accrual related to a business acquisition or divestiture, to currency movements, or revisions in previously existing estimates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.Y.Q2) -URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 + Details
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- Definition Accumulated amortization of other deferred costs capitalized at the end of the reporting period. Does not include deferred finance costs, deferred acquisition costs of insurance companies, or deferred leasing costs for real estate operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 + Details
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- Definition Amount of noncash expense included in interest expense to issue debt and obtain financing associated with the related debt instruments. Alternate captions include noncash interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -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 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 8 -Article 9 + Details
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- Definition For each income statement presented, the amount charged to expense for amortization of capitalized computer software costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128487-111756 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 + Details
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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + 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 The charge against earnings in the period for known or estimated future costs arising from requirements to perform environmental remediation activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -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 410 -SubTopic 30 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13296-110859 + Details
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- Definition Amount of each individual error being corrected in the correcting adjustment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 1.N.Q3) -URI http://asc.fasb.org/extlink&oid=26874127&loc=d3e30840-122693 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 1 -Section N + Details
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