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Income Taxes (Schedule Of Valuation Allowance Activity) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2011
Income Tax Disclosure [Abstract] |  |  |
Balance at beginning of year | $ 95,721 us-gaap_ValuationAllowancesAndReservesBalance | $ 26,312 us-gaap_ValuationAllowancesAndReservesBalance |
(Credited) / charged to income | 74,157 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense | (614)us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense | (1,800)us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense
Translation adjustment | (800)us-gaap_ValuationAllowancesAndReservesAdjustments | (746)us-gaap_ValuationAllowancesAndReservesAdjustments | (52)us-gaap_ValuationAllowancesAndReservesAdjustments
Changes attributable to movement in underlying assets | 1,953 gti_ValuationAllowanceChangesinUnderlyingAssets | (4,541)gti_ValuationAllowanceChangesinUnderlyingAssets | 2,655 gti_ValuationAllowanceChangesinUnderlyingAssets
Balance at end of year | $ 20,411 us-gaap_ValuationAllowancesAndReservesBalance | $ 95,721 us-gaap_ValuationAllowancesAndReservesBalance | $ 25,509 us-gaap_ValuationAllowancesAndReservesBalance

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- Definition Valuation Allowance, Changes in Underlying Assets + References No definition available. + Details
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- Details
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- Definition Total of the adjustments in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, charged to costs and expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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