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Segment Reporting Revenue from External Customers by Products and Services (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Revenue from External Customer [Line Items] |  |  |
Revenue, Net | $ 1,085,304 us-gaap_SalesRevenueNet | $ 1,166,674 us-gaap_SalesRevenueNet | $ 1,248,264 us-gaap_SalesRevenueNet
UNITED STATES |  |  |
Revenue from External Customer [Line Items] |  |  |
Revenue, Net | 284,209 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US | 289,866 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US | 372,014 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US
Americas [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Revenue, Net | 180,070 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_AmericasMember | 177,602 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_AmericasMember | 195,748 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_AmericasMember
Asia Pacific [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Revenue, Net | 192,230 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember | 220,945 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember | 235,658 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember
Europe Middle East Africa [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Revenue, Net | $ 428,795 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = gti_EuropeMiddleEastAfricaMember | $ 478,261 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = gti_EuropeMiddleEastAfricaMember | $ 444,844 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = gti_EuropeMiddleEastAfricaMember

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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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