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Debt And Liquidity (Narrative) (Details) (USD $) | 3 Months Ended | 0 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2015 | Nov. 30, 2010 | Feb. 27, 2015 | Dec. 31, 2014 | Nov. 20, 2012
Debt Instrument [Line Items] |  |  |  |  |
Fair value of debt | $ 459,800,000 us-gaap_LongTermDebtFairValue |  |  | $ 473,300,000 us-gaap_LongTermDebtFairValue |
Book value of debt | 527,800,000 us-gaap_OtherLongTermDebtCurrent |  |  | 529,700,000 us-gaap_OtherLongTermDebtCurrent |
Stated interest rate |  |  |  | 6.375%us-gaap_DebtInstrumentInterestRateStatedPercentage |
Interest rate used to record at present value | 7.00%us-gaap_SubordinatedBorrowingInterestRate |  |  |  |
Loan balance, net of unamortized discount | 191,446,000 us-gaap_LongTermDebtCurrent |  |  | 188,104,000 us-gaap_LongTermDebtCurrent |
Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal amount issued |  |  |  |  | 300,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Stated interest rate |  |  |  |  | 6.375%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Redemption price, percentage of principal, prior to November 15, 2016 |  |  |  |  | 100.00%gti_RedemptionPricePercentageOfPrincipalPriorToNovember152016 / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Redemption price, percentage of principal, prior to November 15, 2015 |  |  |  |  | 106.375%gti_RedemptionPricePercentageOfPrincipalPriorToNovember152015 / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Repurchase price, percentage of principal, due to change in control |  |  |  |  | 101.00%gti_RepurchasePercentagePriceOfAggregatePrincipalDueToChangeInControl / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Senior Notes | Minimum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Unpaid indebtedness or accelerated proceeds exceeds | 50,000,000 gti_UnpaidIndebtnessAfterMaturityOrAcceleration / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |
Unpaid judgment or decree in excess of | 50,000,000 gti_UnpaidJudgmentOrDecree / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |
Senior Notes | Maximum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Percentage of principal allowed to redeem |  |  |  |  | 35.00%gti_AggregatePrincipalRedemptionPercentagePricePriorToNovember152015 / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Senior Subordinated Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Face amount of debt issued in connection with acquisition |  | 200,000,000 us-gaap_NotesIssued1 / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorSubordinatedNotesMember |  |  |
Interest rate used to record at present value |  | 7.00%us-gaap_SubordinatedBorrowingInterestRate / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorSubordinatedNotesMember |  |  |
Amended and Restated Credit Agreement |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Unused borrowing capacity | 329,000,000 us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount / us-gaap_DebtInstrumentAxis = gti_AmendedandRestatedCreditAgreementFebruary2015Member |  |  |  |
Outstanding letters of credit | 5,400,000 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_DebtInstrumentAxis = gti_AmendedandRestatedCreditAgreementFebruary2015Member |  |  |  |
Minimum cash interest coverage ratio |  |  | 2.50 gti_LineofCreditFacilityCovenantTermsMinimumCashInterestCoverageRatio / us-gaap_DebtInstrumentAxis = gti_AmendedandRestatedCreditAgreementFebruary2015Member |  |
Range of maximum senior secured leverage ratio, minimum |  |  | 3.75 gti_LineofCreditFacilityCovenantTermsRangeofMaximumSeniorSecuredLeverageRatioMinimum / us-gaap_DebtInstrumentAxis = gti_AmendedandRestatedCreditAgreementFebruary2015Member |  |
Range of maximum senior secured leverage ratio, maximum |  |  | 3.00 gti_LineofCreditFacilityCovenantTermsRangeofMaximumSeniorSecuredLeverageRatioMaximum / us-gaap_DebtInstrumentAxis = gti_AmendedandRestatedCreditAgreementFebruary2015Member |  |
Amended and Restated Credit Agreement | Minimum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Undrawn commitment fee |  |  | 0.35%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage / us-gaap_DebtInstrumentAxis = gti_AmendedandRestatedCreditAgreementFebruary2015Member / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Amended and Restated Credit Agreement | Maximum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Undrawn commitment fee |  |  | 0.50%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage / us-gaap_DebtInstrumentAxis = gti_AmendedandRestatedCreditAgreementFebruary2015Member / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Amended and Restated Credit Agreement | LIBOR | Minimum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Margin spread on variable interest rate |  |  | 2.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = gti_AmendedandRestatedCreditAgreementFebruary2015Member / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |
Amended and Restated Credit Agreement | LIBOR | Maximum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Margin spread on variable interest rate |  |  | 3.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = gti_AmendedandRestatedCreditAgreementFebruary2015Member / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |
Term Loan Facility | Amended and Restated Credit Agreement |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Borrowing capacity |  |  | 40,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = gti_TermLoanFacilityMember / us-gaap_DebtInstrumentAxis = gti_AmendedandRestatedCreditAgreementFebruary2015Member |  |
Revolving Credit Facility | Amended and Restated Credit Agreement |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Borrowing capacity |  |  | 400,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_DebtInstrumentAxis = gti_AmendedandRestatedCreditAgreementFebruary2015Member |  |

X
- Definition Aggregate Principal Redemption Percentage + References No definition available. + Details
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- Definition Line of Credit Facility, Covenant Terms, Minimum Cash Interest Coverage Ratio + References No definition available. + Details
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- Definition Line of Credit Facility, Covenant Terms, Range of Maximum Senior Secured Leverage Ratio, Maximum + References No definition available. + Details
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- Definition Line of Credit Facility, Covenant Terms, Range of Maximum Senior Secured Leverage Ratio, Minimum + References No definition available. + Details
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- Definition Redemption Price Percentage Of Principal Prior To November 15, 2015 + References No definition available. + Details
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- Definition Redemption Price Percentage Of Principal + References No definition available. + Details
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- Definition Repurchase Percentage Price Of Aggregate Principal Due To Change In Control + References No definition available. + Details
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Namespace Prefix: | gti_
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- Definition Unpaid Indebtness After Maturity Or Acceleration + References No definition available. + Details
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Namespace Prefix: | gti_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Unpaid Judgment Or Decree + References No definition available. + Details
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Namespace Prefix: | gti_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + 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 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Details
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- Definition Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date. + 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 210.5-02.22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Balance Type: | credit
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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- Definition Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + 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 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Balance Type: | credit
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | credit
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- Definition The fair value of notes issued in noncash investing and financing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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Balance Type: | credit
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- Definition Carrying value as of the balance sheet date of the portion of long-term debt not otherwise specified in the taxonomy that is scheduled to be repaid within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Balance Type: | credit
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- Definition Stated interest rate of the subordinated debt. + References No definition available. + Details
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- Details
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- Details
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- Details
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