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Segment Reporting (Schedule Of Financial Information Concerning Reportable Segments) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 segment | Mar. 31, 2014
Segment Reporting Information [Line Items] |  |
Number of reportable segments | 2 us-gaap_NumberOfReportableSegments |
Total net sales | $ 207,211 us-gaap_SalesRevenueNet | $ 280,791 us-gaap_SalesRevenueNet
Total operating loss | (45,833)us-gaap_OperatingIncomeLoss | (7,069)us-gaap_OperatingIncomeLoss
Other expense (income), net | 393 us-gaap_OtherNonoperatingIncomeExpense | 794 us-gaap_OtherNonoperatingIncomeExpense
Interest expense | 8,921 us-gaap_InterestExpense | 8,999 us-gaap_InterestExpense
Interest income | (73)us-gaap_InvestmentIncomeInterest | (58)us-gaap_InvestmentIncomeInterest
Loss before provision for income taxes | (55,074)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | (16,804)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Industrial Materials |  |
Segment Reporting Information [Line Items] |  |
Total net sales | 165,037 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = gti_IndustrialMaterialsMember | 218,776 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = gti_IndustrialMaterialsMember
Total operating loss | (25,898)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = gti_IndustrialMaterialsMember | 1,600 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = gti_IndustrialMaterialsMember
Engineered Solutions |  |
Segment Reporting Information [Line Items] |  |
Total net sales | 42,174 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = gti_EngineeredSolutionsMember | 62,015 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = gti_EngineeredSolutionsMember
Total operating loss | $ (4,393)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = gti_EngineeredSolutionsMember | $ 5,406 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = gti_EngineeredSolutionsMember

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- Definition This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=51673353&loc=d3e41242-110953 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 10 -Article 5 + Details
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- Definition Amount of the cost of borrowed funds accounted for as interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.9) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(b)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
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- Definition The net result for the period of deducting operating expenses from operating revenues. + References No definition available. + Details
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- Definition The net amount of other income and expense amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income (expense) recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) net gains or losses on securities, (d) unusual costs, (e) gains or losses on foreign exchange transactions, and (f) miscellaneous other income and expense items. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.9) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Details
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- Details
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