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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				$ 529,719,000us-gaap_OtherLongTermDebtCurrent
Long-term debt	341,615,000us-gaap_LongTermDebtNoncurrent			541,593,000us-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	3.00gti_DebtInstrumentInterestCoverageRatio
Financial covenants, maximum net senior secured leverage ratio				2.25gti_DebtInstrumentLeverageRatio
Senior subordinated notes implied rate	7.00%us-gaap_SubordinatedBorrowingInterestRate
Loan balance, net of unamortized discount				541,593,000us-gaap_LongTermDebt
Line of Credit Facility, Maximum Borrowing Capacity			400,000,000us-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		200,000,000us-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	0us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorSubordinatedNotesMember			175,675,000us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorSubordinatedNotesMember
Debt Instrument Loan Balance Net Of Unamortized Discount	188,000,000gti_DebtInstrumentLoanBalanceNetOfUnamortizedDiscount / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorSubordinatedNotesMember
Level 2 [Member]
Debt Instrument [Line Items]
Long-term debt				$ 541,593,000us-gaap_LongTermDebtNoncurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member

X

- Definition

Debt instrument interest coverage ratio.

+ References

No definition available.

+ Details

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X

- Definition

Debt instrument leverage ratio.

+ References

No definition available.

+ Details

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Balance Type:	na
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X

- Definition

Debt instrument loan balance net of unamortized discount.

+ References

No definition available.

+ Details

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Namespace Prefix:	gti_
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Balance Type:	credit
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X

- Definition

Percentage of federal effective fund rate plus

+ References

No definition available.

+ Details

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Balance Type:	na
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X

- Definition

Percentage of margin plus alternate base rate.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

X

- Definition

Percentage of margin plus London interbank offered rate.

+ References

No definition available.

+ Details

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Namespace Prefix:	gti_
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Balance Type:	na
Period Type:	duration

X

- Definition

Percentage Of One Month Interest rate Plus London Interbank Offering Rate

+ References

No definition available.

+ Details

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Namespace Prefix:	gti_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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- Details

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Balance Type:	na
Period Type:	duration

X

- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

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X

- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 7



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

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-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

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Balance Type:	credit
Period Type:	instant

X

- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The fair value of notes issued in noncash investing and financing activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 4

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-Topic 230

-SubTopic 10

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-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

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Balance Type:	credit
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- Definition

Carrying value as of the balance sheet date of the portion of long-term debt not otherwise specified in the taxonomy that is scheduled to be repaid within one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 20

-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Stated interest rate of the subordinated debt.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
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- Details

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