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Retirement Plans And Postretirement Benefits (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 years | Dec. 31, 2013 | Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percentage of increase in salaries based on the final average wages | 6.00%gti_PercentageOfIncreaseInSalariesBasedOnFinalAverageWages |  |
Percentage of equity in GTI | 50.00%gti_PercentageOfEquityInGti |  |
Option to remain in defined benefit plan for an additional period, in years | 5 years |  |
Percentage of quarterly contributions to each employee's total eligible pay | 1.00%gti_PercentageOfQuarterlyContributionsToEachEmployeesTotalEligiblePay |  |
Pension and other postretirement benefit contributions | $ 0.8 us-gaap_PensionAndOtherPostretirementBenefitContributions | $ 0.9 us-gaap_PensionAndOtherPostretirementBenefitContributions | $ 1.0 us-gaap_PensionAndOtherPostretirementBenefitContributions
Defined benefit plan, accumulated benefit obligation | 237.0 us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation | 213.2 us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation |
Employee retirement age, years | 65 gti_EmployeeRetirementAge |  |
Prior service credit from stockholders' equity | 0.2 us-gaap_DefinedBenefitPlanFutureAmortizationOfPriorServiceCostCredit |  |
Assets of trust approximately | 5.2 us-gaap_CompensationAndBenefitsTrust | 5.3 us-gaap_CompensationAndBenefitsTrust |
Common stock held in employee benefit and compensation trusts, shares | 80,967 us-gaap_CommonStockSharesHeldInEmployeeTrustShares | 87,206 us-gaap_CommonStockSharesHeldInEmployeeTrustShares |
Basic contribution to savings plan by employees in percentage | 5.00%gti_BasicContributionToSavingsPlanByEmployeesInPercentage |  |
Additional basic contribution to savings plan by employees in percentage | 45.00%gti_AdditionalBasicContributionToSavingsPlanByEmployeesInPercentage |  |
Stock issued during period, shares, employee savings plan | 581,006 us-gaap_StockIssuedDuringPeriodSharesEmployeeBenefitPlan | 553,298 us-gaap_StockIssuedDuringPeriodSharesEmployeeBenefitPlan | 433,496 us-gaap_StockIssuedDuringPeriodSharesEmployeeBenefitPlan
Stock issued during period, value, employee benefit plan | $ 4.4 us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan | $ 4.6 us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan | $ 4.6 us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan
First Of Employee Contribution [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Units of fund that invest in our common stock | 100.00%gti_UnitsOfFundThatInvestInOurCommonStockPercentage / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = gti_FirstOfEmployeeContributionMember |  |
Employee contribution percent | 3.00%gti_EmployeeContributionPercent / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = gti_FirstOfEmployeeContributionMember |  |
Next of Employee Contribution [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Units of fund that invest in our common stock | 50.00%gti_UnitsOfFundThatInvestInOurCommonStockPercentage / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = gti_NextOfEmployeeContributionMember |  |
Employee contribution percent | 2.00%gti_EmployeeContributionPercent / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = gti_NextOfEmployeeContributionMember |  |
Equity Securities [Member] | U.S. [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Investment plan percentage | 20.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember |  |
Investment plan maximum | 100.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMaximum / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember |  |
Fixed Income Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Investment plan percentage | 100.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_FixedIncomeSecuritiesMember |  |
Fixed Income Securities [Member] | U.S. [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Investment plan percentage | 80.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_FixedIncomeSecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember |  |

X
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- Definition Basic contribution to savings plan by employees in percentage. + References No definition available. + Details
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- Definition Defined benefit plan option for employees to remain for maximum additional period. + References No definition available. + Details
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- Definition Employee Contribution Percent + References No definition available. + Details
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- Definition Employee retirement age. + References No definition available. + Details
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- Definition Percentage of equity in GTI. + References No definition available. + Details
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- Definition Percentage of increase in salaries based on the final average wages. + References No definition available. + Details
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- Definition Percentage of quarterly contributions to each employee's total eligible pay. + References No definition available. + Details
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- Definition Units of fund that invest in our common stock. + References No definition available. + Details
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- Definition Number of common stock held in a trust that has been set up specifically to accumulate stock for the sole purpose of distribution to participating employees but not yet earned. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 25 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6418455&loc=d3e16701-113920 + Details
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- Definition The value of a trust established to hold the stock of an employee compensation and benefits plan as of the balance sheet date. + References No definition available. + Details
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- Definition For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Accumulated Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6503844 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Details
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- Definition Amount included in accumulated other comprehensive income (AOCI) related to prior service cost (credit) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position. + References No definition available. + Details
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- Definition Target allocation of investments of this type to total plan assets presented on a weighted average basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2446-114920 + Details
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- Definition Target allocation maximum percentage of investments of this type to total plan assets presented on a weighted average basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2446-114920 + Details
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- Definition The amount of cash or cash equivalents contributed during the reporting period by the entity to fund its pension plans and its non-pension postretirement benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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- Definition Number of shares issued during the period to an employee benefit plan, such as a defined contribution or defined benefit plan. + References No definition available. + Details
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- Definition Value of shares issued during the period to an employee benefit plan, such as a defined contribution or defined benefit plan. + References No definition available. + Details
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