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Segment Reporting Summary Of Information Of Long-Lived Assets In Different Geographic Areas (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Net property, plant and equipment | $ 654,040 us-gaap_PropertyPlantAndEquipmentNet | [1] | $ 820,985 us-gaap_PropertyPlantAndEquipmentNet | [1]
United States And Canada [Member] |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Net property, plant and equipment | 431,601 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = gti_UnitedStatesAndCanadaMember | [1] | 540,274 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = gti_UnitedStatesAndCanadaMember | [1]
MEXICO |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Net property, plant and equipment | 89,731 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_MX | [1] | 83,428 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_MX | [1]
BRAZIL |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Net property, plant and equipment | 9,492 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_BR | [1] | 26,008 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_BR | [1]
FRANCE |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Net property, plant and equipment | 49,602 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_FR | [1] | 61,264 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_FR | [1]
SPAIN |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Net property, plant and equipment | 70,648 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_ES | [1] | 82,051 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_ES | [1]
SOUTH AFRICA |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Net property, plant and equipment | 2,064 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_ZA | [1] | 16,408 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_ZA | [1]
SWITZERLAND |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Net property, plant and equipment | 287 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_CH | [1] | 4,618 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_CH | [1]
Other Countries [Member] |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Net property, plant and equipment | $ 615 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = gti_OtherCountriesMember | [1] | $ 6,934 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = gti_OtherCountriesMember | [1]
[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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