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Business Segments (Schedule Of Net Sales By Geographic Area) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Segment Reporting Information [Line Items]      
Net Sales by Geographic Area, Total $ 923,033tg_NetSales [1],[2] $ 930,721tg_NetSales [1],[2] $ 857,342tg_NetSales [1],[2]
United States      
Segment Reporting Information [Line Items]      
Net Sales by Geographic Area, Total 542,395tg_NetSales
/ us-gaap_StatementGeographicalAxis
= country_US		 [2] 534,346tg_NetSales
/ us-gaap_StatementGeographicalAxis
= country_US		 [2] 480,041tg_NetSales
/ us-gaap_StatementGeographicalAxis
= country_US		 [2]
Exports From The United States | Asia      
Segment Reporting Information [Line Items]      
Net Sales by Geographic Area, Total 72,597tg_NetSales
/ us-gaap_StatementBusinessSegmentsAxis
= tg_ExportsFromUnitedStatesMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaMember		 [2] 82,235tg_NetSales
/ us-gaap_StatementBusinessSegmentsAxis
= tg_ExportsFromUnitedStatesMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaMember		 [2] 57,639tg_NetSales
/ us-gaap_StatementBusinessSegmentsAxis
= tg_ExportsFromUnitedStatesMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaMember		 [2]
Exports From The United States | Canada      
Segment Reporting Information [Line Items]      
Net Sales by Geographic Area, Total 47,391tg_NetSales
/ us-gaap_StatementBusinessSegmentsAxis
= tg_ExportsFromUnitedStatesMember
/ us-gaap_StatementGeographicalAxis
= country_CA		 [2] 46,481tg_NetSales
/ us-gaap_StatementBusinessSegmentsAxis
= tg_ExportsFromUnitedStatesMember
/ us-gaap_StatementGeographicalAxis
= country_CA		 [2] 46,948tg_NetSales
/ us-gaap_StatementBusinessSegmentsAxis
= tg_ExportsFromUnitedStatesMember
/ us-gaap_StatementGeographicalAxis
= country_CA		 [2]
Exports From The United States | Europe      
Segment Reporting Information [Line Items]      
Net Sales by Geographic Area, Total 10,874tg_NetSales
/ us-gaap_StatementBusinessSegmentsAxis
= tg_ExportsFromUnitedStatesMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember		 [2] 6,984tg_NetSales
/ us-gaap_StatementBusinessSegmentsAxis
= tg_ExportsFromUnitedStatesMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember		 [2] 5,186tg_NetSales
/ us-gaap_StatementBusinessSegmentsAxis
= tg_ExportsFromUnitedStatesMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember		 [2]
Exports From The United States | Latin America      
Segment Reporting Information [Line Items]      
Net Sales by Geographic Area, Total 3,116tg_NetSales
/ us-gaap_StatementBusinessSegmentsAxis
= tg_ExportsFromUnitedStatesMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_LatinAmericaMember		 [2] 3,505tg_NetSales
/ us-gaap_StatementBusinessSegmentsAxis
= tg_ExportsFromUnitedStatesMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_LatinAmericaMember		 [2] 3,145tg_NetSales
/ us-gaap_StatementBusinessSegmentsAxis
= tg_ExportsFromUnitedStatesMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_LatinAmericaMember		 [2]
Operations Outside The United States | Brazil      
Segment Reporting Information [Line Items]      
Net Sales by Geographic Area, Total 97,954tg_NetSales
/ us-gaap_StatementBusinessSegmentsAxis
= tg_OperationsOutsideUnitedStatesMember
/ us-gaap_StatementGeographicalAxis
= country_BR		 [2] 109,415tg_NetSales
/ us-gaap_StatementBusinessSegmentsAxis
= tg_OperationsOutsideUnitedStatesMember
/ us-gaap_StatementGeographicalAxis
= country_BR		 [2] 121,373tg_NetSales
/ us-gaap_StatementBusinessSegmentsAxis
= tg_OperationsOutsideUnitedStatesMember
/ us-gaap_StatementGeographicalAxis
= country_BR		 [2]
Operations Outside The United States | The Netherlands      
Segment Reporting Information [Line Items]      
Net Sales by Geographic Area, Total 74,329tg_NetSales
/ us-gaap_StatementBusinessSegmentsAxis
= tg_OperationsOutsideUnitedStatesMember
/ us-gaap_StatementGeographicalAxis
= country_NL		 [2] 68,471tg_NetSales
/ us-gaap_StatementBusinessSegmentsAxis
= tg_OperationsOutsideUnitedStatesMember
/ us-gaap_StatementGeographicalAxis
= country_NL		 [2] 67,758tg_NetSales
/ us-gaap_StatementBusinessSegmentsAxis
= tg_OperationsOutsideUnitedStatesMember
/ us-gaap_StatementGeographicalAxis
= country_NL		 [2]
Operations Outside The United States | Hungary      
Segment Reporting Information [Line Items]      
Net Sales by Geographic Area, Total 39,457tg_NetSales
/ us-gaap_StatementBusinessSegmentsAxis
= tg_OperationsOutsideUnitedStatesMember
/ us-gaap_StatementGeographicalAxis
= country_HU		 [2] 43,482tg_NetSales
/ us-gaap_StatementBusinessSegmentsAxis
= tg_OperationsOutsideUnitedStatesMember
/ us-gaap_StatementGeographicalAxis
= country_HU		 [2] 41,285tg_NetSales
/ us-gaap_StatementBusinessSegmentsAxis
= tg_OperationsOutsideUnitedStatesMember
/ us-gaap_StatementGeographicalAxis
= country_HU		 [2]
Operations Outside The United States | China      
Segment Reporting Information [Line Items]      
Net Sales by Geographic Area, Total 26,109tg_NetSales
/ us-gaap_StatementBusinessSegmentsAxis
= tg_OperationsOutsideUnitedStatesMember
/ us-gaap_StatementGeographicalAxis
= country_CN		 [2] 28,702tg_NetSales
/ us-gaap_StatementBusinessSegmentsAxis
= tg_OperationsOutsideUnitedStatesMember
/ us-gaap_StatementGeographicalAxis
= country_CN		 [2] 30,636tg_NetSales
/ us-gaap_StatementBusinessSegmentsAxis
= tg_OperationsOutsideUnitedStatesMember
/ us-gaap_StatementGeographicalAxis
= country_CN		 [2]
Operations Outside The United States | India      
Segment Reporting Information [Line Items]      
Net Sales by Geographic Area, Total $ 8,811tg_NetSales
/ us-gaap_StatementBusinessSegmentsAxis
= tg_OperationsOutsideUnitedStatesMember
/ us-gaap_StatementGeographicalAxis
= country_IN		 [2] $ 7,100tg_NetSales
/ us-gaap_StatementBusinessSegmentsAxis
= tg_OperationsOutsideUnitedStatesMember
/ us-gaap_StatementGeographicalAxis
= country_IN		 [2] $ 3,331tg_NetSales
/ us-gaap_StatementBusinessSegmentsAxis
= tg_OperationsOutsideUnitedStatesMember
/ us-gaap_StatementGeographicalAxis
= country_IN		 [2]
[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.