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v2.4.1.9

Guarantor Infromation (Cash Flows) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Jun. 30, 2013 | Dec. 31, 2012
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Net cash (used in) provided by operating activities | $ 22,718 us-gaap_NetCashProvidedByUsedInOperatingActivities | $ 22,090 us-gaap_NetCashProvidedByUsedInOperatingActivities |  |
Cash flow from investing activities: |  |  |  |
(Loans to) repayments from affiliates | 0 gti_RepaymentsFromLoansToAffiliates | 0 gti_RepaymentsFromLoansToAffiliates |  |
Capital expenditures | (13,601)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | (21,728)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment |  |
Proceeds from derivative instruments | (7,603)us-gaap_PaymentsForProceedsFromDerivativeInstrumentInvestingActivities | (367)us-gaap_PaymentsForProceedsFromDerivativeInstrumentInvestingActivities |  |
Proceeds from the sale of assets | 521 us-gaap_ProceedsFromSaleOfProductiveAssets | 1,895 us-gaap_ProceedsFromSaleOfProductiveAssets |  |
Insurance recoveries | 0 us-gaap_ProceedsFromInsuranceSettlementInvestingActivities | 3,057 us-gaap_ProceedsFromInsuranceSettlementInvestingActivities |  |
Net cash used in investing activities | (20,683)us-gaap_NetCashProvidedByUsedInInvestingActivities | (17,143)us-gaap_NetCashProvidedByUsedInInvestingActivities |  |
Cash flow from financing activities: |  |  |  |
Repayments to affiliates | 0 us-gaap_PaymentsForProceedsFromBusinessesAndInterestInAffiliates |  |  |
Loans from (repayments to) affiliates |  | 0 us-gaap_ProceedsFromRepaymentsOfRelatedPartyDebt |  |
Short-term debt borrowings | 1 us-gaap_ProceedsFromRepaymentsOfShortTermDebt | (994)us-gaap_ProceedsFromRepaymentsOfShortTermDebt |  |
Revolving Facility borrowings | 27,000 us-gaap_ProceedsFromLinesOfCredit | 75,000 us-gaap_ProceedsFromLinesOfCredit |  |
Revolving Facility reductions | (32,000)us-gaap_RepaymentsOfLinesOfCredit | (65,000)us-gaap_RepaymentsOfLinesOfCredit |  |
Principal payments on long term debt | (33)us-gaap_RepaymentsOfLongTermDebt | (92)us-gaap_RepaymentsOfLongTermDebt |  |
Supply chain financing | 0 gti_SupplyChainFinancing | (9,455)gti_SupplyChainFinancing |  |
Proceeds from exercise of stock options | 0 us-gaap_ProceedsFromStockOptionsExercised | 82 us-gaap_ProceedsFromStockOptionsExercised |  |
Purchase of treasury shares | (41)us-gaap_PaymentsForRepurchaseOfCommonStock | (141)us-gaap_PaymentsForRepurchaseOfCommonStock |  |
Revolving Facility refinancing | (2,247)us-gaap_PaymentsOfFinancingCosts | 0 us-gaap_PaymentsOfFinancingCosts |  |
Other | (54)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities | 918 us-gaap_ProceedsFromPaymentsForOtherFinancingActivities |  |
Net cash provided by financing activities | (7,374)us-gaap_NetCashProvidedByUsedInFinancingActivities | 318 us-gaap_NetCashProvidedByUsedInFinancingActivities |  |
Net (decrease) increase in cash and cash equivalents | (5,339)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | 5,265 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease |  |
Effect of exchange rate changes on cash and cash equivalents | (1,250)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents | 171 us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents |  |
Cash and cash equivalents at beginning of period | 17,550 us-gaap_CashAndCashEquivalentsAtCarryingValue | 11,888 us-gaap_CashAndCashEquivalentsAtCarryingValue | 17,324 us-gaap_CashAndCashEquivalentsAtCarryingValue | 11,888 us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of period | 10,961 us-gaap_CashAndCashEquivalentsAtCarryingValue | 17,324 us-gaap_CashAndCashEquivalentsAtCarryingValue | 17,324 us-gaap_CashAndCashEquivalentsAtCarryingValue | 11,888 us-gaap_CashAndCashEquivalentsAtCarryingValue
Parent Company [Member] |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Net cash (used in) provided by operating activities | 1,136 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 496 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Cash flow from investing activities: |  |  |  |
(Loans to) repayments from affiliates | (1,095)gti_RepaymentsFromLoansToAffiliates / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (1,355)gti_RepaymentsFromLoansToAffiliates / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Capital expenditures | 0 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Proceeds from derivative instruments | 0 us-gaap_PaymentsForProceedsFromDerivativeInstrumentInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_PaymentsForProceedsFromDerivativeInstrumentInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Proceeds from the sale of assets | 0 us-gaap_ProceedsFromSaleOfProductiveAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |
Insurance recoveries | 0 us-gaap_ProceedsFromInsuranceSettlementInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_ProceedsFromInsuranceSettlementInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Net cash used in investing activities | (1,095)us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (1,355)us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Cash flow from financing activities: |  |  |  |
Repayments to affiliates | 0 us-gaap_PaymentsForProceedsFromBusinessesAndInterestInAffiliates / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |
Loans from (repayments to) affiliates |  | 0 us-gaap_ProceedsFromRepaymentsOfRelatedPartyDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Short-term debt borrowings | 0 us-gaap_ProceedsFromRepaymentsOfShortTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_ProceedsFromRepaymentsOfShortTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Revolving Facility borrowings | 0 us-gaap_ProceedsFromLinesOfCredit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_ProceedsFromLinesOfCredit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Revolving Facility reductions | 0 us-gaap_RepaymentsOfLinesOfCredit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_RepaymentsOfLinesOfCredit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Principal payments on long term debt | 0 us-gaap_RepaymentsOfLongTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_RepaymentsOfLongTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Supply chain financing | 0 gti_SupplyChainFinancing / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 gti_SupplyChainFinancing / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Proceeds from exercise of stock options | 0 us-gaap_ProceedsFromStockOptionsExercised / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 82 us-gaap_ProceedsFromStockOptionsExercised / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Purchase of treasury shares | (41)us-gaap_PaymentsForRepurchaseOfCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (141)us-gaap_PaymentsForRepurchaseOfCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Revolving Facility refinancing | 0 us-gaap_PaymentsOfFinancingCosts / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |
Other | 0 us-gaap_ProceedsFromPaymentsForOtherFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 918 us-gaap_ProceedsFromPaymentsForOtherFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Net cash provided by financing activities | (41)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 859 us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Net (decrease) increase in cash and cash equivalents | 0 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Effect of exchange rate changes on cash and cash equivalents | 0 us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Cash and cash equivalents at beginning of period | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Cash and cash equivalents at end of period | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Guarantor Subsidiaries [Member] |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Net cash (used in) provided by operating activities | 17,731 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 31,748 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Cash flow from investing activities: |  |  |  |
(Loans to) repayments from affiliates | 0 gti_RepaymentsFromLoansToAffiliates / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 0 gti_RepaymentsFromLoansToAffiliates / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Capital expenditures | (8,777)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (16,486)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Proceeds from derivative instruments | (6,776)us-gaap_PaymentsForProceedsFromDerivativeInstrumentInvestingActivities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (258)us-gaap_PaymentsForProceedsFromDerivativeInstrumentInvestingActivities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Proceeds from the sale of assets | 394 us-gaap_ProceedsFromSaleOfProductiveAssets / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 714 us-gaap_ProceedsFromSaleOfProductiveAssets / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Insurance recoveries | 0 us-gaap_ProceedsFromInsuranceSettlementInvestingActivities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 0 us-gaap_ProceedsFromInsuranceSettlementInvestingActivities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Net cash used in investing activities | (15,159)us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (16,030)us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Cash flow from financing activities: |  |  |  |
Repayments to affiliates | 1,095 us-gaap_PaymentsForProceedsFromBusinessesAndInterestInAffiliates / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |
Loans from (repayments to) affiliates |  | 1,355 us-gaap_ProceedsFromRepaymentsOfRelatedPartyDebt / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Short-term debt borrowings | 1 us-gaap_ProceedsFromRepaymentsOfShortTermDebt / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (11)us-gaap_ProceedsFromRepaymentsOfShortTermDebt / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Revolving Facility borrowings | 27,000 us-gaap_ProceedsFromLinesOfCredit / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 30,000 us-gaap_ProceedsFromLinesOfCredit / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Revolving Facility reductions | (32,000)us-gaap_RepaymentsOfLinesOfCredit / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (46,000)us-gaap_RepaymentsOfLinesOfCredit / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Principal payments on long term debt | (33)us-gaap_RepaymentsOfLongTermDebt / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (32)us-gaap_RepaymentsOfLongTermDebt / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Supply chain financing | 0 gti_SupplyChainFinancing / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 0 gti_SupplyChainFinancing / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Proceeds from exercise of stock options | 0 us-gaap_ProceedsFromStockOptionsExercised / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 0 us-gaap_ProceedsFromStockOptionsExercised / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Purchase of treasury shares | 0 us-gaap_PaymentsForRepurchaseOfCommonStock / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 0 us-gaap_PaymentsForRepurchaseOfCommonStock / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Revolving Facility refinancing | (2,247)us-gaap_PaymentsOfFinancingCosts / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |
Other | (54)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 0 us-gaap_ProceedsFromPaymentsForOtherFinancingActivities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Net cash provided by financing activities | (6,238)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (14,688)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Net (decrease) increase in cash and cash equivalents | (3,666)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 1,030 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Effect of exchange rate changes on cash and cash equivalents | 0 us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 0 us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Cash and cash equivalents at beginning of period | 5,503 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 4,752 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Cash and cash equivalents at end of period | 1,837 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 5,782 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Non-Guarantor Subsidiaries [Member] |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Net cash (used in) provided by operating activities | 3,851 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (10,154)us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Cash flow from investing activities: |  |  |  |
(Loans to) repayments from affiliates | 0 gti_RepaymentsFromLoansToAffiliates / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 0 gti_RepaymentsFromLoansToAffiliates / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Capital expenditures | (4,824)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (5,242)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Proceeds from derivative instruments | (827)us-gaap_PaymentsForProceedsFromDerivativeInstrumentInvestingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (109)us-gaap_PaymentsForProceedsFromDerivativeInstrumentInvestingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Proceeds from the sale of assets | 127 us-gaap_ProceedsFromSaleOfProductiveAssets / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 1,181 us-gaap_ProceedsFromSaleOfProductiveAssets / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Insurance recoveries | 0 us-gaap_ProceedsFromInsuranceSettlementInvestingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 3,057 us-gaap_ProceedsFromInsuranceSettlementInvestingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Net cash used in investing activities | (5,524)us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (1,113)us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Cash flow from financing activities: |  |  |  |
Repayments to affiliates | 0 us-gaap_PaymentsForProceedsFromBusinessesAndInterestInAffiliates / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |
Loans from (repayments to) affiliates |  | 0 us-gaap_ProceedsFromRepaymentsOfRelatedPartyDebt / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Short-term debt borrowings | 0 us-gaap_ProceedsFromRepaymentsOfShortTermDebt / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (983)us-gaap_ProceedsFromRepaymentsOfShortTermDebt / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Revolving Facility borrowings | 0 us-gaap_ProceedsFromLinesOfCredit / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 45,000 us-gaap_ProceedsFromLinesOfCredit / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Revolving Facility reductions | 0 us-gaap_RepaymentsOfLinesOfCredit / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (19,000)us-gaap_RepaymentsOfLinesOfCredit / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Principal payments on long term debt | 0 us-gaap_RepaymentsOfLongTermDebt / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (60)us-gaap_RepaymentsOfLongTermDebt / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Supply chain financing | 0 gti_SupplyChainFinancing / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (9,455)gti_SupplyChainFinancing / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Proceeds from exercise of stock options | 0 us-gaap_ProceedsFromStockOptionsExercised / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 0 us-gaap_ProceedsFromStockOptionsExercised / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Purchase of treasury shares | 0 us-gaap_PaymentsForRepurchaseOfCommonStock / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 0 us-gaap_PaymentsForRepurchaseOfCommonStock / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Revolving Facility refinancing | 0 us-gaap_PaymentsOfFinancingCosts / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |
Other | 0 us-gaap_ProceedsFromPaymentsForOtherFinancingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 0 us-gaap_ProceedsFromPaymentsForOtherFinancingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Net cash provided by financing activities | 0 us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 15,502 us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Net (decrease) increase in cash and cash equivalents | (1,673)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 4,235 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Effect of exchange rate changes on cash and cash equivalents | (1,250)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 171 us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Cash and cash equivalents at beginning of period | 12,047 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 7,136 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Cash and cash equivalents at end of period | 9,124 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 11,542 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Consolidating Entries and Eliminations [Member] |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Net cash (used in) provided by operating activities | 0 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |
Cash flow from investing activities: |  |  |  |
(Loans to) repayments from affiliates | 1,095 gti_RepaymentsFromLoansToAffiliates / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 1,355 gti_RepaymentsFromLoansToAffiliates / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |
Capital expenditures | 0 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |
Proceeds from derivative instruments | 0 us-gaap_PaymentsForProceedsFromDerivativeInstrumentInvestingActivities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_PaymentsForProceedsFromDerivativeInstrumentInvestingActivities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |
Proceeds from the sale of assets | 0 us-gaap_ProceedsFromSaleOfProductiveAssets / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |
Insurance recoveries | 0 us-gaap_ProceedsFromInsuranceSettlementInvestingActivities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_ProceedsFromInsuranceSettlementInvestingActivities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |
Net cash used in investing activities | 1,095 us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 1,355 us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |
Cash flow from financing activities: |  |  |  |
Repayments to affiliates | (1,095)us-gaap_PaymentsForProceedsFromBusinessesAndInterestInAffiliates / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |
Loans from (repayments to) affiliates |  | (1,355)us-gaap_ProceedsFromRepaymentsOfRelatedPartyDebt / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |
Short-term debt borrowings | 0 us-gaap_ProceedsFromRepaymentsOfShortTermDebt / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_ProceedsFromRepaymentsOfShortTermDebt / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |
Revolving Facility borrowings | 0 us-gaap_ProceedsFromLinesOfCredit / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_ProceedsFromLinesOfCredit / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3044-108585 + Details
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- Definition Amount of increase (decrease) from the effect of exchange rate changes on cash and cash equivalent balances held in foreign currencies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 230 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49171198&loc=d3e33268-110906 + Details
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- Definition Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3574-108585 + Details
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- Definition Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3574-108585 + Details
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- Definition Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3521-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3536-108585 + Details
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- Definition The net cash outflow or inflow associated with the acquisition or sale of a business segment during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3179-108585 + Details
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- Definition The net cash outflow or inflow from derivative instruments during the period, which are classified as investing activities, excluding those designated as hedging instruments. + References No definition available. + Details
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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585 + Details
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- Definition The cash outflow for loan and debt issuance costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585 + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585 + Details
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- Definition The cash inflow from the amounts received by the insured under the terms of an insurance contract settlement. This element pertains only to insurance proceeds related to investments, for example fixed assets. It excludes insurance settlements classified as operating cash flows. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3179-108585 + Details
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- Definition Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements. + 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.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3255-108585 + Details
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- Definition The net cash inflow or outflow from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3095-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3098-108585 + Details
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- Definition Amount of cash inflow (outflow) from long-term debt by a related party. Related parties, include, but are not limited to, affiliates, owners or officers and their immediate families, and pension trusts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The net cash inflow or outflow for borrowing having initial term of repayment within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3098-108585 + Details
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- Definition The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3179-108585 + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3255-108585 + Details
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