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Income Taxes (Schedule Of Income Tax Expense (Benefit) Computed By Applying The U.S. Federal Income Tax Rate) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income Tax Disclosure [Abstract] |  |  |
Tax at statutory U.S. federal rate | $ (103,177)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | $ (14,036)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | $ 47,071 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
U.S. valuation allowance, net | 73,350 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | (700)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | (1,800)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
State taxes, net of federal tax benefit | (4,387)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | (371)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | 593 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
U.S. tax return adjustments to estimated taxes | (368)us-gaap_IncomeTaxReconciliationPriorYearIncomeTaxes | (1,032)us-gaap_IncomeTaxReconciliationPriorYearIncomeTaxes | 588 us-gaap_IncomeTaxReconciliationPriorYearIncomeTaxes
Establishment (resolution) of uncertain tax positions | (513)us-gaap_IncomeTaxReconciliationTaxContingencies | (752)us-gaap_IncomeTaxReconciliationTaxContingencies | (8,118)us-gaap_IncomeTaxReconciliationTaxContingencies
Adjustment for foreign income taxed at different rates | 7,376 us-gaap_IncomeTaxReconciliationTaxCreditsForeign | 6,832 us-gaap_IncomeTaxReconciliationTaxCreditsForeign | (15,553)us-gaap_IncomeTaxReconciliationTaxCreditsForeign
U.S. tax credits | (1,000)us-gaap_IncomeTaxReconciliationTaxCredits | (2,577)us-gaap_IncomeTaxReconciliationTaxCredits | (2,200)us-gaap_IncomeTaxReconciliationTaxCredits
Non-U.S. tax exemptions, holidays and credits | 0 us-gaap_IncomeTaxReconciliationTaxHolidays | 0 us-gaap_IncomeTaxReconciliationTaxHolidays | (4,259)us-gaap_IncomeTaxReconciliationTaxHolidays
Goodwill impairment | 17,161 us-gaap_IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses | 0 us-gaap_IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses | 0 us-gaap_IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses
Capital loss expiration | 2,422 gti_EffectiveIncomeTaxRateReconciliationCapitalLossExpirationAmount | 0 gti_EffectiveIncomeTaxRateReconciliationCapitalLossExpirationAmount | 0 gti_EffectiveIncomeTaxRateReconciliationCapitalLossExpirationAmount
Other | (280)us-gaap_IncomeTaxReconciliationOtherAdjustments | (207)us-gaap_IncomeTaxReconciliationOtherAdjustments | 524 us-gaap_IncomeTaxReconciliationOtherAdjustments
Total income tax (benefit) expense | $ (9,416)us-gaap_IncomeTaxExpenseBenefit | $ (12,843)us-gaap_IncomeTaxExpenseBenefit | $ 16,846 us-gaap_IncomeTaxExpenseBenefit

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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