XML 34 R89.htm IDEA: XBRL DOCUMENT v2.4.1.9
Retirement Plans And Postretirement Benefits (Components Of Net Postretirement Costs) (Details) (Postretirement Benefit Costs [Member], USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
U.S. [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 0us-gaap_DefinedBenefitPlanServiceCost
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PostretirementBenefitCostsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
$ 0us-gaap_DefinedBenefitPlanServiceCost
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PostretirementBenefitCostsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
$ 0us-gaap_DefinedBenefitPlanServiceCost
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PostretirementBenefitCostsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
Interest cost 396us-gaap_DefinedBenefitPlanInterestCost
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PostretirementBenefitCostsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
371us-gaap_DefinedBenefitPlanInterestCost
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PostretirementBenefitCostsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
497us-gaap_DefinedBenefitPlanInterestCost
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PostretirementBenefitCostsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
Amortization of prior service (credit) cost 0us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PostretirementBenefitCostsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
0us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PostretirementBenefitCostsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
0us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PostretirementBenefitCostsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
Curtailment (gain) loss 0us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToCurtailments
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PostretirementBenefitCostsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
0us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToCurtailments
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PostretirementBenefitCostsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
0us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToCurtailments
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PostretirementBenefitCostsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
Mark-to-market loss (gain) loss 1,151gti_MarkToMarketAdjustment
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PostretirementBenefitCostsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
(1,284)gti_MarkToMarketAdjustment
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PostretirementBenefitCostsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
60gti_MarkToMarketAdjustment
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PostretirementBenefitCostsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
Net Cost 1,547us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PostretirementBenefitCostsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
(913)us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PostretirementBenefitCostsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
557us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PostretirementBenefitCostsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
Foreign [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Service cost 71us-gaap_DefinedBenefitPlanServiceCost
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PostretirementBenefitCostsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
105us-gaap_DefinedBenefitPlanServiceCost
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PostretirementBenefitCostsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
183us-gaap_DefinedBenefitPlanServiceCost
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PostretirementBenefitCostsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
Interest cost 976us-gaap_DefinedBenefitPlanInterestCost
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PostretirementBenefitCostsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
994us-gaap_DefinedBenefitPlanInterestCost
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PostretirementBenefitCostsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
1,024us-gaap_DefinedBenefitPlanInterestCost
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PostretirementBenefitCostsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
Amortization of prior service (credit) cost (180)us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PostretirementBenefitCostsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
(193)us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PostretirementBenefitCostsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
(199)us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PostretirementBenefitCostsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
Curtailment (gain) loss (294)us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToCurtailments
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PostretirementBenefitCostsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
0us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToCurtailments
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PostretirementBenefitCostsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
1,170us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToCurtailments
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PostretirementBenefitCostsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
Mark-to-market loss (gain) loss 1,456gti_MarkToMarketAdjustment
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PostretirementBenefitCostsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
(1,210)gti_MarkToMarketAdjustment
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PostretirementBenefitCostsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
551gti_MarkToMarketAdjustment
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PostretirementBenefitCostsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
Net Cost $ 2,029us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PostretirementBenefitCostsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
$ (304)us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PostretirementBenefitCostsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
$ 2,729us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PostretirementBenefitCostsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember