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

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