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v2.4.1.9

Long-Term Debt And Liquidity Long-Term Debt And Liquidity (Senior Notes) (Details) (Senior Notes [Member], USD $) In Millions, unless otherwise specified | Nov. 20, 2012 | Dec. 31, 2014
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Debt Instrument [Line Items] |  |
Principal amount issued | $ 300 us-gaap_DebtInstrumentFaceAmount |
Stated interest rate | 6.375%us-gaap_DebtInstrumentInterestRateStatedPercentage |
Redemption price percentage of principal prior to November 15, 2016 | 100.00%gti_RedemptionPricePercentageOfPrincipalPriorToNovember152016 |
Redemption price percentage of principal prior to November 15, 2015 | 106.375%gti_RedemptionPricePercentageOfPrincipalPriorToNovember152015 |
Repurchase percentage price of aggregate principal due to change in control | 101.00%gti_RepurchasePercentagePriceOfAggregatePrincipalDueToChangeInControl |
Maximum [Member] |  |
Debt Instrument [Line Items] |  |
Redemption percentage price of aggregate principal prior to November 15, 2015 | 35.00%gti_AggregatePrincipalRedemptionPercentagePricePriorToNovember152015 / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember / us-gaap_RangeAxis = us-gaap_MaximumMember |
Minimum [Member] |  |
Debt Instrument [Line Items] |  |
Unpaid indebtness after maturity or acceleration |  | 50.0 gti_UnpaidIndebtnessAfterMaturityOrAcceleration / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Unpaid judgment or decree |  | $ 50.0 gti_UnpaidJudgmentOrDecree / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember / us-gaap_RangeAxis = us-gaap_MinimumMember

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- Definition Aggregate Principal Redemption Percentage + References No definition available. + Details
Name: | gti_AggregatePrincipalRedemptionPercentagePricePriorToNovember152015
Namespace Prefix: | gti_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Redemption Price Percentage Of Principal Prior To November 15, 2015 + References No definition available. + Details
Name: | gti_RedemptionPricePercentageOfPrincipalPriorToNovember152015
Namespace Prefix: | gti_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Redemption Price Percentage Of Principal + References No definition available. + Details
Name: | gti_RedemptionPricePercentageOfPrincipalPriorToNovember152016
Namespace Prefix: | gti_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Repurchase Percentage Price Of Aggregate Principal Due To Change In Control + References No definition available. + Details
Name: | gti_RepurchasePercentagePriceOfAggregatePrincipalDueToChangeInControl
Namespace Prefix: | gti_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Unpaid Indebtness After Maturity Or Acceleration + References No definition available. + Details
Name: | gti_UnpaidIndebtnessAfterMaturityOrAcceleration
Namespace Prefix: | gti_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Unpaid Judgment Or Decree + References No definition available. + Details
Name: | gti_UnpaidJudgmentOrDecree
Namespace Prefix: | gti_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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=6584090&loc=d3e28878-108400 + Details
Name: | us-gaap_DebtInstrumentFaceAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -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 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |