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Goodwill And Other Intangible Assets (Schedule Of Intangible Assets With Determinable Useful Lives By Major Category) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Goodwill [Line Items] |  |
Gross Carrying Amount | $ 162,047 us-gaap_FiniteLivedIntangibleAssetsGross | $ 162,047 us-gaap_FiniteLivedIntangibleAssetsGross
Accumulated Amortization & Impairment | (86,949)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization | (91,293)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Net Carrying Amount | 75,098 us-gaap_FiniteLivedIntangibleAssetsNet | 70,754 us-gaap_FiniteLivedIntangibleAssetsNet
Trade Name |  |
Goodwill [Line Items] |  |
Gross Carrying Amount | 7,900 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember | 7,900 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember
Accumulated Amortization & Impairment | (4,986)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember | (4,817)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember
Net Carrying Amount | 2,914 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember | 3,083 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember
Technological Know-How |  |
Goodwill [Line Items] |  |
Gross Carrying Amount | 43,349 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TechnologyEquipmentMember | 43,349 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TechnologyEquipmentMember
Accumulated Amortization & Impairment | (26,433)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TechnologyEquipmentMember | (24,940)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TechnologyEquipmentMember
Net Carrying Amount | 16,916 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TechnologyEquipmentMember | 18,409 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TechnologyEquipmentMember
Customer-Related Intangible |  |
Goodwill [Line Items] |  |
Gross Carrying Amount | 110,798 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = gti_CustomerRelatedIntangibleMember | 110,798 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = gti_CustomerRelatedIntangibleMember
Accumulated Amortization & Impairment | (59,874)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = gti_CustomerRelatedIntangibleMember | (57,192)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = gti_CustomerRelatedIntangibleMember
Net Carrying Amount | $ 50,924 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = gti_CustomerRelatedIntangibleMember | $ 53,606 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = gti_CustomerRelatedIntangibleMember

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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