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Segment Reporting Schedule Of Long-Lived Assets By Reportable Segment (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Segment Reporting Information [Line Items] |  |  |  |
Net property, plant and equipment | $ 654,040 us-gaap_PropertyPlantAndEquipmentNet | [1] | $ 820,985 us-gaap_PropertyPlantAndEquipmentNet | [1]
Industrial Materials [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net property, plant and equipment | 552,155 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementBusinessSegmentsAxis = gti_IndustrialMaterialsMember |  | 601,322 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementBusinessSegmentsAxis = gti_IndustrialMaterialsMember |
Engineered Solutions [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net property, plant and equipment | $ 101,885 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementBusinessSegmentsAxis = gti_EngineeredSolutionsMember |  | $ 219,663 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementBusinessSegmentsAxis = gti_EngineeredSolutionsMember |
[1] | Long-lived assets represent fixed assets, net of accumulated depreciation.

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- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 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 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph a -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 7 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=gti_IndustrialMaterialsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |