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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
Revenues from External Customers and Long-Lived Assets [Line Items]
Net property, plant and equipment	$ 654,040us-gaap_PropertyPlantAndEquipmentNet	[1]	$ 820,985us-gaap_PropertyPlantAndEquipmentNet	[1]
United States And Canada [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net property, plant and equipment	431,601us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = gti_UnitedStatesAndCanadaMember	[1]	540,274us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = gti_UnitedStatesAndCanadaMember	[1]
MEXICO
Revenues from External Customers and Long-Lived Assets [Line Items]
Net property, plant and equipment	89,731us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_MX	[1]	83,428us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_MX	[1]
BRAZIL
Revenues from External Customers and Long-Lived Assets [Line Items]
Net property, plant and equipment	9,492us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_BR	[1]	26,008us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_BR	[1]
FRANCE
Revenues from External Customers and Long-Lived Assets [Line Items]
Net property, plant and equipment	49,602us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_FR	[1]	61,264us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_FR	[1]
SPAIN
Revenues from External Customers and Long-Lived Assets [Line Items]
Net property, plant and equipment	70,648us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_ES	[1]	82,051us-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	2,064us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_ZA	[1]	16,408us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_ZA	[1]
SWITZERLAND
Revenues from External Customers and Long-Lived Assets [Line Items]
Net property, plant and equipment	287us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_CH	[1]	4,618us-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	$ 615us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = gti_OtherCountriesMember	[1]	$ 6,934us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = gti_OtherCountriesMember	[1]
[1] Long-lived assets represent fixed assets, net of accumulated depreciation.

X

- 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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