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v2.4.1.9

Guarantor Information (Income and Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2015 | Mar. 31, 2014
Condensed Financial Statements, Captions [Line Items] |  |
Sales - affiliates | $ 0 us-gaap_RevenueFromRelatedParties | $ 0 us-gaap_RevenueFromRelatedParties
Sales - third party | 207,211 us-gaap_OtherSalesRevenueNet | 280,791 us-gaap_OtherSalesRevenueNet
Net sales | 207,211 us-gaap_SalesRevenueNet | 280,791 us-gaap_SalesRevenueNet
Cost of sales | 186,448 us-gaap_CostOfGoodsAndServicesSold | 255,097 us-gaap_CostOfGoodsAndServicesSold
Gross profit | 20,763 us-gaap_GrossProfit | 25,694 us-gaap_GrossProfit
Research and development | 2,431 us-gaap_ResearchAndDevelopmentExpense | 2,770 us-gaap_ResearchAndDevelopmentExpense
Selling and administrative expenses | 26,290 us-gaap_SellingGeneralAndAdministrativeExpense | 29,907 us-gaap_SellingGeneralAndAdministrativeExpense
Impairments | 35,381 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse | 0 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
Rationalizations | 2,494 us-gaap_RestructuringAndRelatedCostIncurredCost | 86 us-gaap_RestructuringAndRelatedCostIncurredCost
Operating loss | (45,833)us-gaap_OperatingIncomeLoss | (7,069)us-gaap_OperatingIncomeLoss
Other (income) expense, net | 393 us-gaap_OtherNonoperatingIncomeExpense | 794 us-gaap_OtherNonoperatingIncomeExpense
Interest expense - affiliate | 0 us-gaap_InterestExpenseRelatedParty | 0 us-gaap_InterestExpenseRelatedParty
Interest expense - third party | 8,921 us-gaap_InterestExpenseOther | 8,999 us-gaap_InterestExpenseOther
Interest income - affiliate | 0 gti_InvestmentIncomeInterestRelatedParty | 0 gti_InvestmentIncomeInterestRelatedParty
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
(Benefit) provision for income taxes | 534 us-gaap_IncomeTaxExpenseBenefit | (5,287)us-gaap_IncomeTaxExpenseBenefit
Equity in earnings of subsidiary | 0 us-gaap_IncomeLossFromEquityMethodInvestments | 0 us-gaap_IncomeLossFromEquityMethodInvestments
Net loss | (55,608)us-gaap_NetIncomeLoss | (11,517)us-gaap_NetIncomeLoss
Statements of Comprehensive Income |  |
Net income | (55,608)us-gaap_NetIncomeLoss | (11,517)us-gaap_NetIncomeLoss
Other comprehensive income (loss), net of tax: | (28,766)us-gaap_OtherComprehensiveIncomeLossNetOfTax | 2,072 us-gaap_OtherComprehensiveIncomeLossNetOfTax
Comprehensive loss | (84,374)us-gaap_ComprehensiveIncomeNetOfTax | (9,445)us-gaap_ComprehensiveIncomeNetOfTax
Parent Company [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Sales - affiliates | 0 us-gaap_RevenueFromRelatedParties / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_RevenueFromRelatedParties / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Sales - third party | 0 us-gaap_OtherSalesRevenueNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_OtherSalesRevenueNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net sales | 0 us-gaap_SalesRevenueNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_SalesRevenueNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cost of sales | 0 us-gaap_CostOfGoodsAndServicesSold / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_CostOfGoodsAndServicesSold / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Gross profit | 0 us-gaap_GrossProfit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_GrossProfit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Research and development | 0 us-gaap_ResearchAndDevelopmentExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_ResearchAndDevelopmentExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Selling and administrative expenses | 0 us-gaap_SellingGeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_SellingGeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Impairments | 0 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Rationalizations | 0 us-gaap_RestructuringAndRelatedCostIncurredCost / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_RestructuringAndRelatedCostIncurredCost / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Operating loss | 0 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other (income) expense, net | 0 us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Interest expense - affiliate | 0 us-gaap_InterestExpenseRelatedParty / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_InterestExpenseRelatedParty / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Interest expense - third party | 8,162 us-gaap_InterestExpenseOther / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 7,952 us-gaap_InterestExpenseOther / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Interest income - affiliate | (160)gti_InvestmentIncomeInterestRelatedParty / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (226)gti_InvestmentIncomeInterestRelatedParty / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Interest income | 0 us-gaap_InvestmentIncomeInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_InvestmentIncomeInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Loss before provision for income taxes | (8,002)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (7,726)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
(Benefit) provision for income taxes | 0 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (2,781)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Equity in earnings of subsidiary | (47,606)us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (6,572)us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net loss | (55,608)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (11,517)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Statements of Comprehensive Income |  |
Net income | (55,608)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (11,517)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other comprehensive income (loss), net of tax: | (28,766)us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,072 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Comprehensive loss | (84,374)us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (9,445)us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Guarantor Subsidiaries [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Sales - affiliates | 51,184 us-gaap_RevenueFromRelatedParties / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 70,357 us-gaap_RevenueFromRelatedParties / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Sales - third party | 72,021 us-gaap_OtherSalesRevenueNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 111,124 us-gaap_OtherSalesRevenueNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Net sales | 123,205 us-gaap_SalesRevenueNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 181,481 us-gaap_SalesRevenueNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Cost of sales | 116,589 us-gaap_CostOfGoodsAndServicesSold / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 157,029 us-gaap_CostOfGoodsAndServicesSold / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Gross profit | 6,616 us-gaap_GrossProfit / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 24,452 us-gaap_GrossProfit / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Research and development | 2,431 us-gaap_ResearchAndDevelopmentExpense / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 2,770 us-gaap_ResearchAndDevelopmentExpense / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Selling and administrative expenses | 14,441 us-gaap_SellingGeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 9,867 us-gaap_SellingGeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Impairments | 35,381 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |
Rationalizations | 326 us-gaap_RestructuringAndRelatedCostIncurredCost / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 36 us-gaap_RestructuringAndRelatedCostIncurredCost / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Operating loss | (45,963)us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 11,779 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Other (income) expense, net | 309 us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 824 us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Interest expense - affiliate | 160 us-gaap_InterestExpenseRelatedParty / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 226 us-gaap_InterestExpenseRelatedParty / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Interest expense - third party | 665 us-gaap_InterestExpenseOther / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 740 us-gaap_InterestExpenseOther / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Interest income - affiliate | 0 gti_InvestmentIncomeInterestRelatedParty / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 0 gti_InvestmentIncomeInterestRelatedParty / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Interest income | 0 us-gaap_InvestmentIncomeInterest / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 0 us-gaap_InvestmentIncomeInterest / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Loss before provision for income taxes | (47,097)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 9,989 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
(Benefit) provision for income taxes | 351 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 4,552 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Equity in earnings of subsidiary | (158)us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (12,009)us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Net loss | (47,606)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (6,572)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Statements of Comprehensive Income |  |
Net income | (47,606)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (6,572)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Other comprehensive income (loss), net of tax: | (28,766)us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 2,072 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Comprehensive loss | (76,372)us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (4,500)us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Non-Guarantor Subsidiaries [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Sales - affiliates | 26,775 us-gaap_RevenueFromRelatedParties / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 35,207 us-gaap_RevenueFromRelatedParties / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Sales - third party | 135,190 us-gaap_OtherSalesRevenueNet / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 169,667 us-gaap_OtherSalesRevenueNet / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Net sales | 161,965 us-gaap_SalesRevenueNet / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 204,874 us-gaap_SalesRevenueNet / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Cost of sales | 147,818 us-gaap_CostOfGoodsAndServicesSold / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 203,632 us-gaap_CostOfGoodsAndServicesSold / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Gross profit | 14,147 us-gaap_GrossProfit / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 1,242 us-gaap_GrossProfit / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Research and development | 0 us-gaap_ResearchAndDevelopmentExpense / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 0 us-gaap_ResearchAndDevelopmentExpense / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Selling and administrative expenses | 11,849 us-gaap_SellingGeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 20,040 us-gaap_SellingGeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Impairments | 0 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |
Rationalizations | 2,168 us-gaap_RestructuringAndRelatedCostIncurredCost / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 50 us-gaap_RestructuringAndRelatedCostIncurredCost / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Operating loss | 130 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (18,848)us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Other (income) expense, net | 84 us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (30)us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Interest expense - affiliate | 0 us-gaap_InterestExpenseRelatedParty / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 0 us-gaap_InterestExpenseRelatedParty / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Interest expense - third party | 94 us-gaap_InterestExpenseOther / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 307 us-gaap_InterestExpenseOther / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Interest income - affiliate | 0 gti_InvestmentIncomeInterestRelatedParty / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 0 gti_InvestmentIncomeInterestRelatedParty / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Interest income | (73)us-gaap_InvestmentIncomeInterest / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (58)us-gaap_InvestmentIncomeInterest / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Loss before provision for income taxes | 25 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (19,067)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
(Benefit) provision for income taxes | 183 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (7,058)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Equity in earnings of subsidiary | 0 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 0 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Net loss | (158)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (12,009)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Statements of Comprehensive Income |  |
Net income | (158)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (12,009)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Other comprehensive income (loss), net of tax: | (28,830)us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 2,477 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Comprehensive loss | (28,988)us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (9,532)us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Consolidating Entries and Eliminations [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Sales - affiliates | (77,959)us-gaap_RevenueFromRelatedParties / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (105,564)us-gaap_RevenueFromRelatedParties / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Sales - third party | 0 us-gaap_OtherSalesRevenueNet / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_OtherSalesRevenueNet / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Net sales | (77,959)us-gaap_SalesRevenueNet / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (105,564)us-gaap_SalesRevenueNet / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Cost of sales | (77,959)us-gaap_CostOfGoodsAndServicesSold / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (105,564)us-gaap_CostOfGoodsAndServicesSold / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Gross profit | 0 us-gaap_GrossProfit / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_GrossProfit / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Research and development | 0 us-gaap_ResearchAndDevelopmentExpense / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_ResearchAndDevelopmentExpense / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Selling and administrative expenses | 0 us-gaap_SellingGeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_SellingGeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Impairments | 0 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |
Rationalizations | 0 us-gaap_RestructuringAndRelatedCostIncurredCost / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_RestructuringAndRelatedCostIncurredCost / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Operating loss | 0 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Other (income) expense, net | 0 us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Interest expense - affiliate | (160)us-gaap_InterestExpenseRelatedParty / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (226)us-gaap_InterestExpenseRelatedParty / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Interest expense - third party | 0 us-gaap_InterestExpenseOther / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_InterestExpenseOther / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Interest income - affiliate | 160 gti_InvestmentIncomeInterestRelatedParty / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 226 gti_InvestmentIncomeInterestRelatedParty / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Interest income | 0 us-gaap_InvestmentIncomeInterest / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_InvestmentIncomeInterest / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Loss before provision for income taxes | 0 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
(Benefit) provision for income taxes | 0 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Equity in earnings of subsidiary | 47,764 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 18,581 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Net loss | 47,764 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 18,581 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Statements of Comprehensive Income |  |
Net income | 47,764 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 18,581 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Other comprehensive income (loss), net of tax: | 57,596 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (4,549)us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Comprehensive loss | $ 105,360 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | $ 14,032 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember

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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=51831270 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Comprehensive Income -URI http://asc.fasb.org/extlink&oid=51831223 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e557-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=51831255 + Details
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