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Plants Shutdowns, Asset Impairments, Restructurings And Other (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Jul. 07, 2015
Other Non-Operating and Non-Recurring Charges [Abstract]          
Unrealized gain (loss) on investment under fair value method     $ 0 $ (1,100)  
Gain (Loss) on Disposition of Assets     0 837  
Harbinger Fund          
Other Non-Operating and Non-Recurring Charges [Abstract]          
Cost-method investment, OTTI $ 0 $ 300 0 600  
Cost-method investment, OTTI net of tax   200   400  
kaleo          
Other Non-Operating and Non-Recurring Charges [Abstract]          
Unrealized gain (loss) on investment under fair value method 0 (1,100) 0 (1,100)  
Unrealized gain (loss) on investment under fair value method, after taxes 0 (700) 0 (700)  
Corporate [Member] [Domain]          
Restructuring Cost and Reserve [Line Items]          
Pretax charges for severance and other employee-related costs 3,900   3,900    
Film Products          
Restructuring Cost and Reserve [Line Items]          
Pretax charges for severance and other employee-related costs 300 600 200 1,400  
Film Products Manufacturing Facility In Red Springs North Carolina | Facility Closing          
Restructuring Cost and Reserve [Line Items]          
Plant shutdown related expenditures   300   700  
Pretax charges for severance and other employee-related costs   200   400  
Pretax loss for asset impairments   100   300  
Aluminum Extrusions Manufacturing Facility In Kentland Indiana [Member] | Facility Closing          
Restructuring Cost and Reserve [Line Items]          
Plant shutdown related expenditures 18 24 33 24  
Aluminum Extrusions Manufacturing Facility In Newnan Georgia [Member]          
Other Non-Operating and Non-Recurring Charges [Abstract]          
Environmental Exit Costs, Anticipated Cost   200   200  
Alleghany and Bath County, Virginia [Member]          
Other Non-Operating and Non-Recurring Charges [Abstract]          
Gain (Loss) on Disposition of Assets $ 0 1,208 $ 0 1,208  
Gain (Loss) on Sale of Investment Property, After Tax   800      
3M vs. Tredegar          
Other Non-Operating and Non-Recurring Charges [Abstract]          
Litigation Settlement, Amount   $ 10,000   $ 10,000  
Minimum | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member]          
Restructuring Cost and Reserve [Line Items]          
EstimatedLengthOfRestructuringProject     21 months    
Maximum | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member]          
Restructuring Cost and Reserve [Line Items]          
EstimatedLengthOfRestructuringProject     24 months    
Subsequent Event [Member] | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member]          
Restructuring Cost and Reserve [Line Items]          
AcceleratedDepreciationExpectedCost         $ 3,000
Subsequent Event [Member] | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | Other Restructuring [Member]          
Restructuring Cost and Reserve [Line Items]          
Restructuring and Related Cost, Expected Cost         2,000
Subsequent Event [Member] | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | RestructuringSeverance&EquipmentTransfers [Member]          
Restructuring Cost and Reserve [Line Items]          
RestructuringExpectedCashOutflows         4,000
Subsequent Event [Member] | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | RestructuringCapExEquiptUpgrades [Member]          
Restructuring Cost and Reserve [Line Items]          
RestructuringExpectedCashOutflows         8,000
Subsequent Event [Member] | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | RestructuringSafetyQualityIncentives [Member]          
Restructuring Cost and Reserve [Line Items]          
RestructuringExpectedCashOutflows         1,000
Subsequent Event [Member] | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | RestructuringProductQualifications [Member]          
Restructuring Cost and Reserve [Line Items]          
RestructuringExpectedCashOutflows         1,000
Subsequent Event [Member] | Minimum | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member]          
Restructuring Cost and Reserve [Line Items]          
Restructuring and Related Cost, Expected Cost         4,000
RestructuringExpectedCashOutflows         13,000
Subsequent Event [Member] | Minimum | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | Severance          
Restructuring Cost and Reserve [Line Items]          
Restructuring and Related Cost, Expected Cost         2,000
Subsequent Event [Member] | Maximum | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member]          
Restructuring Cost and Reserve [Line Items]          
Restructuring and Related Cost, Expected Cost         5,000
RestructuringExpectedCashOutflows         14,000
Subsequent Event [Member] | Maximum | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | Severance          
Restructuring Cost and Reserve [Line Items]          
Restructuring and Related Cost, Expected Cost         $ 3,000