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Acquisitions (Summary Of The Third-Party Debt Assumed And Not Repaid In Connection With The Close Of The Acquisitions) (Details) | 0 Months Ended
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Nov. 30, 2010
Pennsylvania Industrial Development Authority Mortgage Note Due Two Thousand Eighteen Interest Rate Of Three Percentage [Member] |
Business Acquisition [Line Items] |
Stated interest rate | 3.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = gti_PennsylvaniaIndustrialDevelopmentAuthorityMortgageNoteDueTwoThousandEighteenInterestRateOfThreePercentageMember
Debt Instrument Maturity Dates | 2018
Secured Promisory Note Due Two Thousand Fourteen Interest Rate Of Six Point Two Five Percent [Member] |
Business Acquisition [Line Items] |
Stated interest rate | 6.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = gti_SecuredPromisoryNoteDueTwoThousandFourteenInterestRateOfSixPointTwoFivePercentMember
Debt Instrument Maturity Dates | 2014

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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
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