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Long-Term Debt And Liquidity (Narrative) (Details) (USD $) | 12 Months Ended | 0 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2014 | Nov. 30, 2010 | Nov. 19, 2014 | Dec. 31, 2013
Debt Instrument [Line Items] |  |  |  |
Other Long-term Debt, Current |  |  |  | $ 529,719,000 us-gaap_OtherLongTermDebtCurrent
Long-term debt | 341,615,000 us-gaap_LongTermDebtNoncurrent |  |  | 541,593,000 us-gaap_LongTermDebtNoncurrent
Addition to federal effective fund rate to determine base rate | 0.50%gti_PercentageOfFederalEffectiveFundRatePlus |  |  |
Percentage of one-month interest rate plus London interbank offering rate | 1.00%gti_PercentageOfOneMonthInterestRatePlusLondonInterbankOfferingRate |  |  |
Financial covenants, minimum interest coverage ratio | 3.00 gti_DebtInstrumentInterestCoverageRatio |  |  |
Financial covenants, maximum net senior secured leverage ratio |  |  |  | 2.25 gti_DebtInstrumentLeverageRatio
Senior subordinated notes implied rate | 7.00%us-gaap_SubordinatedBorrowingInterestRate |  |  |
Loan balance, net of unamortized discount |  |  |  | 541,593,000 us-gaap_LongTermDebt
Line of Credit Facility, Maximum Borrowing Capacity |  |  | 400,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity |
Minimum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
LIBOR plus margin percentage | 1.50%gti_PercentageOfMarginPlusLondonInterbankOfferedRate / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |
Alternate base rate plus margin percentage | 0.50%gti_PercentageOfMarginPlusAlternateBaseRate / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |
Per annum fee by GrafTech Finance and Swissco | 0.25%us-gaap_LineOfCreditFacilityCommitmentFeePercentage / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |
Maximum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
LIBOR plus margin percentage | 2.25%gti_PercentageOfMarginPlusLondonInterbankOfferedRate / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |
Alternate base rate plus margin percentage | 1.25%gti_PercentageOfMarginPlusAlternateBaseRate / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |
Per annum fee by GrafTech Finance and Swissco | 0.40%us-gaap_LineOfCreditFacilityCommitmentFeePercentage / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |
Senior Subordinated Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Face amount of debt issued in connection with acquisition |  | 200,000,000 us-gaap_NotesIssued1 / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorSubordinatedNotesMember |  |
Senior subordinated notes implied rate |  | 7.00%us-gaap_SubordinatedBorrowingInterestRate / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorSubordinatedNotesMember |  |
Loan balance, net of unamortized discount | 0 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorSubordinatedNotesMember |  |  | 175,675,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorSubordinatedNotesMember
Debt Instrument Loan Balance Net Of Unamortized Discount | 188,000,000 gti_DebtInstrumentLoanBalanceNetOfUnamortizedDiscount / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorSubordinatedNotesMember |  |  |
Level 2 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt |  |  |  | $ 541,593,000 us-gaap_LongTermDebtNoncurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member

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