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Plants Shutdowns, Asset Impairments, Restructurings And Other (Narrative) (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Restructuring Cost and Reserve [Line Items]        
Pretax charges for severance and other employee-related costs $ 900,000 $ 400,000 $ 1,100,000 $ 1,800,000
Loss on asset impairments and divestitures     319,000 993,000
Other Non-Operating and Non-Recurring Charges [Abstract]        
Unrealized gain (loss) on investment under fair value method     0 2,900,000
Gain (Loss) on Disposition of Assets     11,000 919,000
Harbinger Fund        
Other Non-Operating and Non-Recurring Charges [Abstract]        
Cost-method investment, OTTI 0 200,000 0 800,000
Cost-method investment, OTTI net of tax   100,000   500,000
kaleo        
Other Non-Operating and Non-Recurring Charges [Abstract]        
Unrealized gain (loss) on investment under fair value method 0 4,000,000 0 2,900,000
Unrealized gain (loss) on investment under fair value method, after taxes 0 2,500,000 0 1,800,000
Corporate [Member] [Domain]        
Restructuring Cost and Reserve [Line Items]        
Pretax charges for severance and other employee-related costs     3,900,000  
PE Films        
Restructuring Cost and Reserve [Line Items]        
Pretax charges for severance and other employee-related costs 900,000 100,000 900,000 1,500,000
Flexible Packaging Films [Member] [Domain]        
Restructuring Cost and Reserve [Line Items]        
Pretax charges for severance and other employee-related costs   300,000 200,000 300,000
Aluminum Extrusions        
Restructuring Cost and Reserve [Line Items]        
Pretax charges for severance and other employee-related costs 35,000 31,000 35,000 31,000
Corporate Segment [Member]        
Restructuring Cost and Reserve [Line Items]        
Pretax charges for severance and other employee-related costs 26,000   26,000  
Film Products Manufacturing Facility In Red Springs North Carolina | Facility Closing        
Restructuring Cost and Reserve [Line Items]        
Plant shutdown related expenditures   37,000   800,000
Pretax charges for severance and other employee-related costs       500,000
Pretax loss for asset impairments       300,000
Aluminum Extrusions Manufacturing Facility In Kentland Indiana [Member] | Facility Closing        
Restructuring Cost and Reserve [Line Items]        
Plant shutdown related expenditures 300,000 20,000 300,000 43,000
Aluminum Extrusions Manufacturing Facility In Newnan Georgia [Member]        
Restructuring Cost and Reserve [Line Items]        
Environmental Remediation Expense   75,000   200,000
Alleghany and Bath County, Virginia [Member]        
Other Non-Operating and Non-Recurring Charges [Abstract]        
Gain (Loss) on Disposition of Assets 0 $ 0 0 1,208,000
Gain (Loss) on Sale of Investment Property, After Tax       800,000
FilmProductsManufacturingFacilityInLakeZurichIllinois [Member]        
Restructuring Cost and Reserve [Line Items]        
AcceleratedDepreciationExpectedCost 3,000,000   3,000,000  
FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | Other Restructuring [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring and Related Cost, Expected Cost 2,000,000   2,000,000  
Plant shutdown related expenditures 1,200,000   1,200,000  
Pretax charges for severance and other employee-related costs 300,000   300,000  
Loss on asset impairments and divestitures 300,000   300,000  
Accelerated Depreciation Expense 200,000   200,000  
Other Restructuring Costs 300,000   300,000  
Other Plant Consolidation Expenses - Cost of Goods Sold     46,000  
FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | RestructuringSeverance&EquipmentTransfers [Member]        
Restructuring Cost and Reserve [Line Items]        
RestructuringExpectedCashOutflows 4,000,000   4,000,000  
FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | RestructuringCapExEquiptUpgrades [Member]        
Restructuring Cost and Reserve [Line Items]        
RestructuringExpectedCashOutflows 8,000,000   8,000,000  
FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | RestructuringSafetyQualityIncentives [Member]        
Restructuring Cost and Reserve [Line Items]        
RestructuringExpectedCashOutflows 1,000,000   1,000,000  
FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | RestructuringProductQualifications [Member]        
Restructuring Cost and Reserve [Line Items]        
RestructuringExpectedCashOutflows 1,000,000   $ 1,000,000  
3M vs. Tredegar        
Other Non-Operating and Non-Recurring Charges [Abstract]        
Litigation Settlement, Amount       $ 10,000,000
Minimum | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member]        
Restructuring Cost and Reserve [Line Items]        
EstimatedLengthOfRestructuringProject     21 months  
Restructuring and Related Cost, Expected Cost 4,000,000   $ 4,000,000  
RestructuringExpectedCashOutflows 13,000,000   13,000,000  
Minimum | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | Severance        
Restructuring Cost and Reserve [Line Items]        
Restructuring and Related Cost, Expected Cost 2,000,000   $ 2,000,000  
Maximum | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member]        
Restructuring Cost and Reserve [Line Items]        
EstimatedLengthOfRestructuringProject     24 months  
Restructuring and Related Cost, Expected Cost 5,000,000   $ 5,000,000  
RestructuringExpectedCashOutflows 14,000,000   14,000,000  
Maximum | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | Severance        
Restructuring Cost and Reserve [Line Items]        
Restructuring and Related Cost, Expected Cost $ 3,000,000   $ 3,000,000