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Business Segments (Schedule Of Net Sales By Product Group) (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] |  |  |  |  |  |
Net Sales by Product Group | $ 923,033 tg_NetSales | [1],[2] | $ 930,721 tg_NetSales | [1],[2] | $ 857,342 tg_NetSales | [1],[2]
Film Products |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |
Net Sales by Product Group | 578,687 tg_NetSales / us-gaap_StatementBusinessSegmentsAxis = tg_FilmProductsMember |  | 621,239 tg_NetSales / us-gaap_StatementBusinessSegmentsAxis = tg_FilmProductsMember |  | 611,877 tg_NetSales / us-gaap_StatementBusinessSegmentsAxis = tg_FilmProductsMember |
Aluminum Extrusions |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |
Net Sales by Product Group | 344,346 tg_NetSales / us-gaap_StatementBusinessSegmentsAxis = tg_AluminumExtrusionsMember |  | 309,482 tg_NetSales / us-gaap_StatementBusinessSegmentsAxis = tg_AluminumExtrusionsMember |  | 245,465 tg_NetSales / us-gaap_StatementBusinessSegmentsAxis = tg_AluminumExtrusionsMember |
Personal care materials | Film Products |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |
Net Sales by Product Group | 317,080 tg_NetSales / us-gaap_ProductOrServiceAxis = tg_PersonalCareMaterialsMember / us-gaap_StatementBusinessSegmentsAxis = tg_FilmProductsMember |  | 339,559 tg_NetSales / us-gaap_ProductOrServiceAxis = tg_PersonalCareMaterialsMember / us-gaap_StatementBusinessSegmentsAxis = tg_FilmProductsMember |  | 327,161 tg_NetSales / us-gaap_ProductOrServiceAxis = tg_PersonalCareMaterialsMember / us-gaap_StatementBusinessSegmentsAxis = tg_FilmProductsMember |
Flexible packaging films | Film Products |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |
Net Sales by Product Group | 114,348 tg_NetSales / us-gaap_ProductOrServiceAxis = tg_FlexiblePackagingFilmsMember / us-gaap_StatementBusinessSegmentsAxis = tg_FilmProductsMember |  | 125,712 tg_NetSales / us-gaap_ProductOrServiceAxis = tg_FlexiblePackagingFilmsMember / us-gaap_StatementBusinessSegmentsAxis = tg_FilmProductsMember |  | 138,028 tg_NetSales / us-gaap_ProductOrServiceAxis = tg_FlexiblePackagingFilmsMember / us-gaap_StatementBusinessSegmentsAxis = tg_FilmProductsMember |
Surface protection films | Film Products |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |
Net Sales by Product Group | 90,129 tg_NetSales / us-gaap_ProductOrServiceAxis = tg_SurfaceProtectionFilmsMember / us-gaap_StatementBusinessSegmentsAxis = tg_FilmProductsMember |  | 90,182 tg_NetSales / us-gaap_ProductOrServiceAxis = tg_SurfaceProtectionFilmsMember / us-gaap_StatementBusinessSegmentsAxis = tg_FilmProductsMember |  | 69,627 tg_NetSales / us-gaap_ProductOrServiceAxis = tg_SurfaceProtectionFilmsMember / us-gaap_StatementBusinessSegmentsAxis = tg_FilmProductsMember |
Polyethylene overwrap and polypropylene films | Film Products |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |
Net Sales by Product Group | 44,263 tg_NetSales / us-gaap_ProductOrServiceAxis = tg_PolyethyleneOverwrapAndPolypropyleneFilmsMember / us-gaap_StatementBusinessSegmentsAxis = tg_FilmProductsMember |  | 56,590 tg_NetSales / us-gaap_ProductOrServiceAxis = tg_PolyethyleneOverwrapAndPolypropyleneFilmsMember / us-gaap_StatementBusinessSegmentsAxis = tg_FilmProductsMember |  | 63,796 tg_NetSales / us-gaap_ProductOrServiceAxis = tg_PolyethyleneOverwrapAndPolypropyleneFilmsMember / us-gaap_StatementBusinessSegmentsAxis = tg_FilmProductsMember |
Films for other markets | Film Products |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |
Net Sales by Product Group | 12,867 tg_NetSales / us-gaap_ProductOrServiceAxis = tg_FilmsForOtherMarketsMember / us-gaap_StatementBusinessSegmentsAxis = tg_FilmProductsMember |  | 9,196 tg_NetSales / us-gaap_ProductOrServiceAxis = tg_FilmsForOtherMarketsMember / us-gaap_StatementBusinessSegmentsAxis = tg_FilmProductsMember |  | 13,265 tg_NetSales / us-gaap_ProductOrServiceAxis = tg_FilmsForOtherMarketsMember / us-gaap_StatementBusinessSegmentsAxis = tg_FilmProductsMember |
Subtotal | Film Products |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |
Net Sales by Product Group | 578,687 tg_NetSales / us-gaap_ProductOrServiceAxis = tg_FilmProductsSubtotalMember / us-gaap_StatementBusinessSegmentsAxis = tg_FilmProductsMember |  | 621,239 tg_NetSales / us-gaap_ProductOrServiceAxis = tg_FilmProductsSubtotalMember / us-gaap_StatementBusinessSegmentsAxis = tg_FilmProductsMember |  | 611,877 tg_NetSales / us-gaap_ProductOrServiceAxis = tg_FilmProductsSubtotalMember / us-gaap_StatementBusinessSegmentsAxis = tg_FilmProductsMember |
Nonresidential building & construction | Aluminum Extrusions |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |
Net Sales by Product Group | 200,707 tg_NetSales / us-gaap_ProductOrServiceAxis = tg_NonresidentialBuildingAndConstructionMember / us-gaap_StatementBusinessSegmentsAxis = tg_AluminumExtrusionsMember |  | 179,437 tg_NetSales / us-gaap_ProductOrServiceAxis = tg_NonresidentialBuildingAndConstructionMember / us-gaap_StatementBusinessSegmentsAxis = tg_AluminumExtrusionsMember |  | 165,159 tg_NetSales / us-gaap_ProductOrServiceAxis = tg_NonresidentialBuildingAndConstructionMember / us-gaap_StatementBusinessSegmentsAxis = tg_AluminumExtrusionsMember |
Consumer durables | Aluminum Extrusions |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |
Net Sales by Product Group | 44,897 tg_NetSales / us-gaap_ProductOrServiceAxis = tg_ConsumerDurablesMember / us-gaap_StatementBusinessSegmentsAxis = tg_AluminumExtrusionsMember |  | 39,565 tg_NetSales / us-gaap_ProductOrServiceAxis = tg_ConsumerDurablesMember / us-gaap_StatementBusinessSegmentsAxis = tg_AluminumExtrusionsMember |  | 12,259 tg_NetSales / us-gaap_ProductOrServiceAxis = tg_ConsumerDurablesMember / us-gaap_StatementBusinessSegmentsAxis = tg_AluminumExtrusionsMember |
Residential building & construction | Aluminum Extrusions |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |
Net Sales by Product Group | 21,470 tg_NetSales / us-gaap_ProductOrServiceAxis = tg_ResidentialBuildingAndConstructionMember / us-gaap_StatementBusinessSegmentsAxis = tg_AluminumExtrusionsMember |  | 22,055 tg_NetSales / us-gaap_ProductOrServiceAxis = tg_ResidentialBuildingAndConstructionMember / us-gaap_StatementBusinessSegmentsAxis = tg_AluminumExtrusionsMember |  | 23,555 tg_NetSales / us-gaap_ProductOrServiceAxis = tg_ResidentialBuildingAndConstructionMember / us-gaap_StatementBusinessSegmentsAxis = tg_AluminumExtrusionsMember |
Machinery & equipment | Aluminum Extrusions |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |
Net Sales by Product Group | 26,907 tg_NetSales / us-gaap_ProductOrServiceAxis = us-gaap_MachineryAndEquipmentMember / us-gaap_StatementBusinessSegmentsAxis = tg_AluminumExtrusionsMember |  | 21,936 tg_NetSales / us-gaap_ProductOrServiceAxis = us-gaap_MachineryAndEquipmentMember / us-gaap_StatementBusinessSegmentsAxis = tg_AluminumExtrusionsMember |  | 8,773 tg_NetSales / us-gaap_ProductOrServiceAxis = us-gaap_MachineryAndEquipmentMember / us-gaap_StatementBusinessSegmentsAxis = tg_AluminumExtrusionsMember |
Automotive | Aluminum Extrusions |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |
Net Sales by Product Group | 22,272 tg_NetSales / us-gaap_ProductOrServiceAxis = tg_TransportationMember / us-gaap_StatementBusinessSegmentsAxis = tg_AluminumExtrusionsMember |  | 19,919 tg_NetSales / us-gaap_ProductOrServiceAxis = tg_TransportationMember / us-gaap_StatementBusinessSegmentsAxis = tg_AluminumExtrusionsMember |  | 11,757 tg_NetSales / us-gaap_ProductOrServiceAxis = tg_TransportationMember / us-gaap_StatementBusinessSegmentsAxis = tg_AluminumExtrusionsMember |
Distribution | Aluminum Extrusions |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |
Net Sales by Product Group | 15,318 tg_NetSales / us-gaap_ProductOrServiceAxis = tg_DistributionMember / us-gaap_StatementBusinessSegmentsAxis = tg_AluminumExtrusionsMember |  | 13,115 tg_NetSales / us-gaap_ProductOrServiceAxis = tg_DistributionMember / us-gaap_StatementBusinessSegmentsAxis = tg_AluminumExtrusionsMember |  | 15,227 tg_NetSales / us-gaap_ProductOrServiceAxis = tg_DistributionMember / us-gaap_StatementBusinessSegmentsAxis = tg_AluminumExtrusionsMember |
Electrical | Aluminum Extrusions |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |
Net Sales by Product Group | 12,775 tg_NetSales / us-gaap_ProductOrServiceAxis = tg_ElectricalMember / us-gaap_StatementBusinessSegmentsAxis = tg_AluminumExtrusionsMember |  | 13,455 tg_NetSales / us-gaap_ProductOrServiceAxis = tg_ElectricalMember / us-gaap_StatementBusinessSegmentsAxis = tg_AluminumExtrusionsMember |  | 8,735 tg_NetSales / us-gaap_ProductOrServiceAxis = tg_ElectricalMember / us-gaap_StatementBusinessSegmentsAxis = tg_AluminumExtrusionsMember |
Subtotal | Aluminum Extrusions |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |
Net Sales by Product Group | $ 344,346 tg_NetSales / us-gaap_ProductOrServiceAxis = tg_AluminumExtrusionsSubtotalMember / us-gaap_StatementBusinessSegmentsAxis = tg_AluminumExtrusionsMember |  | $ 309,482 tg_NetSales / us-gaap_ProductOrServiceAxis = tg_AluminumExtrusionsSubtotalMember / us-gaap_StatementBusinessSegmentsAxis = tg_AluminumExtrusionsMember |  | $ 245,465 tg_NetSales / us-gaap_ProductOrServiceAxis = tg_AluminumExtrusionsSubtotalMember / us-gaap_StatementBusinessSegmentsAxis = tg_AluminumExtrusionsMember |
[1] | The difference between total consolidated sales as reported in the consolidated statements of income and segment, geographic and product group net sales reported in this note is freight of $28.8 million in 2014, $28.6 million in 2013 and $24.8 million in 2012.
[2] | Information on exports and foreign operations are provided on the previous page. Cash and cash equivalents includes funds held in locations outside the U.S. of $40.5 million and $38.6 million at December 31, 2014 and 2013, respectively. Export sales relate almost entirely to Film Products. Operations outside the U.S. in The Netherlands, Hungary, China, Brazil and India also relate to Film Products. Sales from locations in The Netherlands and Hungary are primarily to customers located in Europe. Sales from locations in China (Guangzhou and Shanghai) are primarily to customers located in China, but also include other customers in Asia.

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