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Consolidated Statements Of Stockholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified | Total | Common Stock [Member] | Additional Paid-In Capital [Member] | Accumulated Other Comprehensive Loss [Member] | Accumulated Deficit [Member] | Treasury Stock [Member] | Common Stock Held In Employee Benefit & Compensation Trust [Member]
--- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2011 | $ 1,339,944 us-gaap_StockholdersEquity | $ 1,499 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 1,798,161 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ (261,937)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ (50,757)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (146,041)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | $ (981)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = gti_CommonStockHeldInEmployeeBenefitAndCompensationMember
Balance, shares at Dec. 31, 2011 |  | 149,861,081 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Comprehensive income (loss): |  |  |  |  |  |  |
Net income (loss) | 117,641 us-gaap_NetIncomeLoss | 0 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 117,641 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 0 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = gti_CommonStockHeldInEmployeeBenefitAndCompensationMember
Other comprehensive income: |  |  |  |  |  |  |
Unrealized losses on securities, net of tax | (8,823)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax | 0 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (11)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (8,812)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 0 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 0 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = gti_CommonStockHeldInEmployeeBenefitAndCompensationMember
Foreign currency translation adjustments | (9,929)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax | 0 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (9,929)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 0 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 0 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = gti_CommonStockHeldInEmployeeBenefitAndCompensationMember
Total comprehensive income | (18,752)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest |  | (11)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (18,741)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |
Treasury stock | (101,697)us-gaap_TreasuryStockValueAcquiredCostMethod |  |  |  |  | (101,697)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |
Stock-based compensation | 7,964 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation | 6 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 9,720 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | (1,762)us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |
Stock-based compensation, shares |  | 553,614 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Shares issued in lieu of cash for incentive compensation | 0 us-gaap_StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan | 0 us-gaap_StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0 us-gaap_StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 us-gaap_StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 0 us-gaap_StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 us-gaap_StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 0 us-gaap_StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan / us-gaap_StatementEquityComponentsAxis = gti_CommonStockHeldInEmployeeBenefitAndCompensationMember
Shares issued in lieu of cash for incentive compensation, shares |  | 0 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockOwnershipPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Common stock issued to savings and pension plan trusts | 4,594 gti_CommonStockIssuedToSavingsAndPensionPlanTrustsValue | 4 gti_CommonStockIssuedToSavingsAndPensionPlanTrustsValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 4,565 gti_CommonStockIssuedToSavingsAndPensionPlanTrustsValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 gti_CommonStockIssuedToSavingsAndPensionPlanTrustsValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 0 gti_CommonStockIssuedToSavingsAndPensionPlanTrustsValue / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 13 gti_CommonStockIssuedToSavingsAndPensionPlanTrustsValue / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 12 gti_CommonStockIssuedToSavingsAndPensionPlanTrustsValue / us-gaap_StatementEquityComponentsAxis = gti_CommonStockHeldInEmployeeBenefitAndCompensationMember
Common stock issued to savings and pension plan trusts, shares |  | 433,061 gti_CommonStockIssuedToSavingsAndPensionPlanTrustsShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Sale of common stock under stock options | 157 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised | 0 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 157 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 0 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 0 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = gti_CommonStockHeldInEmployeeBenefitAndCompensationMember
Number of Shares, Exercised |  | 21,471 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Balance at Dec. 31, 2012 | 1,349,851 us-gaap_StockholdersEquity | 1,509 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 1,812,592 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (280,678)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 66,884 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (249,487)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | (969)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = gti_CommonStockHeldInEmployeeBenefitAndCompensationMember
Balance, shares at Dec. 31, 2012 |  | 150,869,227 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Comprehensive income (loss): |  |  |  |  |  |  |
Net income (loss) | (27,259)us-gaap_NetIncomeLoss | 0 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (27,259)us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 0 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = gti_CommonStockHeldInEmployeeBenefitAndCompensationMember
Other comprehensive income: |  |  |  |  |  |  |
Unrealized losses on securities, net of tax | 2,035 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax | 0 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 2,035 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 0 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 0 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = gti_CommonStockHeldInEmployeeBenefitAndCompensationMember
Foreign currency translation adjustments | (13,981)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax | 0 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (13,981)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 0 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 0 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = gti_CommonStockHeldInEmployeeBenefitAndCompensationMember
Total comprehensive income | (11,946)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest |  |  | (11,946)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |
Treasury stock | 0 us-gaap_TreasuryStockValueAcquiredCostMethod | 0 us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0 us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 0 us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 0 us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = gti_CommonStockHeldInEmployeeBenefitAndCompensationMember
Treasury stock, shares | 10,000,000 us-gaap_TreasuryStockSharesAcquired |  |  |  |  |  |
Stock-based compensation | 5,151 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation | 4 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 2,850 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 2,297 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |
Stock-based compensation, shares |  | 405,168 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Shares issued in lieu of cash for incentive compensation | 4,504 us-gaap_StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan | 6 us-gaap_StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 4,561 us-gaap_StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 0 us-gaap_StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | (63)us-gaap_StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan / us-gaap_StatementEquityComponentsAxis = gti_CommonStockHeldInEmployeeBenefitAndCompensationMember
Shares issued in lieu of cash for incentive compensation, shares |  | 564,435 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockOwnershipPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Common stock issued to savings and pension plan trusts | 448 gti_CommonStockIssuedToSavingsAndPensionPlanTrustsValue | 0 gti_CommonStockIssuedToSavingsAndPensionPlanTrustsValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 448 gti_CommonStockIssuedToSavingsAndPensionPlanTrustsValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 gti_CommonStockIssuedToSavingsAndPensionPlanTrustsValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 0 gti_CommonStockIssuedToSavingsAndPensionPlanTrustsValue / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 gti_CommonStockIssuedToSavingsAndPensionPlanTrustsValue / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 0 gti_CommonStockIssuedToSavingsAndPensionPlanTrustsValue / us-gaap_StatementEquityComponentsAxis = gti_CommonStockHeldInEmployeeBenefitAndCompensationMember
Common stock issued to savings and pension plan trusts, shares |  | 90,735 gti_CommonStockIssuedToSavingsAndPensionPlanTrustsShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Balance at Dec. 31, 2013 | 1,320,749 us-gaap_StockholdersEquity | 1,519 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 1,820,451 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (292,624)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 39,625 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (247,190)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | (1,032)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = gti_CommonStockHeldInEmployeeBenefitAndCompensationMember
Balance, shares at Dec. 31, 2013 |  | 151,929,565 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Comprehensive income (loss): |  |  |  |  |  |  |
Net income (loss) | (285,376)us-gaap_NetIncomeLoss | 0 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (285,376)us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 0 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = gti_CommonStockHeldInEmployeeBenefitAndCompensationMember
Other comprehensive income: |  |  |  |  |  |  |
Unrealized losses on securities, net of tax | (10,859)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax | 0 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (10,859)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 0 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 0 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = gti_CommonStockHeldInEmployeeBenefitAndCompensationMember
Foreign currency translation adjustments | (33,041)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax | 0 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (33,041)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 0 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 0 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = gti_CommonStockHeldInEmployeeBenefitAndCompensationMember
Total comprehensive income | (43,900)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest |  |  | (43,900)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |
Treasury stock | 0 us-gaap_TreasuryStockValueAcquiredCostMethod | 0 us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0 us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 0 us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 0 us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = gti_CommonStockHeldInEmployeeBenefitAndCompensationMember
Stock-based compensation | 5,614 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation | 0 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (1,765)us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 7,379 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |
Stock-based compensation, shares |  | 322 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Shares issued in lieu of cash for incentive compensation |  |  |  | 0 us-gaap_StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 0 us-gaap_StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | 0 us-gaap_StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan / us-gaap_StatementEquityComponentsAxis = gti_CommonStockHeldInEmployeeBenefitAndCompensationMember
Common stock issued to savings and pension plan trusts | 4,623 gti_CommonStockIssuedToSavingsAndPensionPlanTrustsValue | 6 gti_CommonStockIssuedToSavingsAndPensionPlanTrustsValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 4,381 gti_CommonStockIssuedToSavingsAndPensionPlanTrustsValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 gti_CommonStockIssuedToSavingsAndPensionPlanTrustsValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 0 gti_CommonStockIssuedToSavingsAndPensionPlanTrustsValue / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 gti_CommonStockIssuedToSavingsAndPensionPlanTrustsValue / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 236 gti_CommonStockIssuedToSavingsAndPensionPlanTrustsValue / us-gaap_StatementEquityComponentsAxis = gti_CommonStockHeldInEmployeeBenefitAndCompensationMember
Common stock issued to savings and pension plan trusts, shares |  | 574,973 gti_CommonStockIssuedToSavingsAndPensionPlanTrustsShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Sale of common stock under stock options | 2,816 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised | 3 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 2,813 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 0 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 0 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = gti_CommonStockHeldInEmployeeBenefitAndCompensationMember
Number of Shares, Exercised |  | 316,151 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Balance at Dec. 31, 2014 | $ 1,004,526 us-gaap_StockholdersEquity | $ 1,528 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 1,825,880 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ (336,524)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ (245,751)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (239,811)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | $ (796)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = gti_CommonStockHeldInEmployeeBenefitAndCompensationMember
Balance, shares at Dec. 31, 2014 |  | 152,821,011 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |

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