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Losses Associated With Plant Shutdowns, Asset Impairments And Restructurings, Unusual Items, Gains From Sale Of Assets And Other Items (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
USD ($)
employee
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Sep. 30, 2014
USD ($)
Jun. 30, 2014
USD ($)
Mar. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Sep. 30, 2013
USD ($)
Jun. 30, 2013
USD ($)
Mar. 31, 2013
USD ($)
Dec. 31, 2015
USD ($)
employee
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Restructuring Cost and Reserve [Line Items]                              
Severance and other employee-related costs $ 1,100 $ 900 $ 300   $ 500 $ 400                  
Asset impairments                         $ 403 $ 993 $ 1,639
Severance and other employee-related costs after taxes 700 600 200   300 200                  
Business Development Expenses 1,000                            
Business Development Expenses Net Of Tax 600                            
Unrealized gain (loss) on investments under fair value method                         (20,500) 2,000 3,400
Losses Associated with Plant Shutdowns, Asset Impairments, Restructurings & Other               $ 13,800         10,100 3,400  
Losses Associated with Plant Shutdowns, Asset Impairments, Restructurings & Other After Taxes               9,300         6,400 2,200  
Payments for Restructuring                         2,027 3,039 1,434
kaleo                              
Restructuring Cost and Reserve [Line Items]                              
Unrealized gain (loss) on investments under fair value method [1]                         (20,500) 2,000 3,400
Unrealized gain (loss) on investments, net of tax                         (15,700) 1,000 2,200
Harbinger                              
Restructuring Cost and Reserve [Line Items]                              
Unrealized loss on investments under fair value method, other than temporary impairment                           800 400
Unrealized loss on investments under fair value method, other than temporary impairment, after taxes                           400 300
Alleghany and Bath County, Virginia                              
Restructuring Cost and Reserve [Line Items]                              
Gain (Loss) on Disposition of Assets                         0 1,208 0
Unrealized Gain (Loss) on Investment Property                         0 0 (1,018)
Unrealized Gain Loss On Investment Property After Tax                             $ (600)
Gain (Loss) on Sale of Investment Property, After Tax                           800  
PE Films [Member]                              
Restructuring Cost and Reserve [Line Items]                              
Severance and other employee-related costs                       $ 100      
Severance and other employee-related costs after taxes                       67      
Aluminum Extrusions                              
Restructuring Cost and Reserve [Line Items]                              
Severance and other employee-related costs                 $ 300            
Severance and other employee-related costs after taxes                 200            
Corporate Segment [Member]                              
Restructuring Cost and Reserve [Line Items]                              
Severance and other employee-related costs   26                          
Corporate [Member] [Domain]                              
Restructuring Cost and Reserve [Line Items]                              
Severance and other employee-related costs     3,900                        
Severance and other employee-related costs after taxes     2,500                        
Flexible Packaging Films [Member] [Domain]                              
Restructuring Cost and Reserve [Line Items]                              
Severance and other employee-related costs     300 $ (100)                      
Severance and other employee-related costs after taxes       0                      
PE Films [Member]                              
Restructuring Cost and Reserve [Line Items]                              
Severance and other employee-related costs   900 0   200 100 $ 600 800              
Severance and other employee-related costs after taxes             400 500              
PE Films [Member] | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member]                              
Restructuring Cost and Reserve [Line Items]                              
AcceleratedDepreciationExpectedCost 3,000                       3,000    
Payments for Restructuring                         3,100    
Capital Expenditures Restructuring Project                         2,500    
PE Films [Member] | Film Products Manufacturing Facility in Shanghai, China                              
Restructuring Cost and Reserve [Line Items]                              
Gain (loss) on sale of equipment                     $ (91)        
Gain (Loss) on Disposition of Property, Plant, and Equipment, Net of Tax                     (91)        
PE Films [Member] | Film Products Manufacturing Facility in LaGrange, Georgia                              
Restructuring Cost and Reserve [Line Items]                              
Gain (loss) on sale of equipment         0                    
Gain (Loss) on Disposition of Property, Plant, and Equipment, Net of Tax         73                    
PE Films [Member] | RestructuringProductQualifications [Member] | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member]                              
Restructuring Cost and Reserve [Line Items]                              
RestructuringExpectedCashOutflows $ 1,000                       1,000    
PE Films [Member] | Facility Closing | Film Products Manufacturing Facility in Red Springs, NC                              
Restructuring Cost and Reserve [Line Items]                              
Plant shutdown related expenditures         100 (37) (300) (500) (300) $ (200)     (700) $ (500)  
Plant shutdown related expenditures after taxes         63 (23) (200) (300) (200) (83)          
Severance and other employee-related costs                 300       400    
Asset Impairment and Other Plant Shutdown Related Costs                         $ 300    
Asset impairments                   200          
Number of employees employed | employee 66                       66    
PE Films [Member] | Other Restructuring [Member] | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member]                              
Restructuring Cost and Reserve [Line Items]                              
Other Restructuring Costs                         $ 600    
Other Plant Consolidation Expenses - Cost of Goods Sold                         100    
Restructuring and Related Cost, Expected Cost $ 2,000                       2,000    
Plant shutdown related expenditures (1,000) (1,200)                          
Plant shutdown related expenditures after taxes (600) (700)                          
Severance and other employee-related costs                         800    
Asset impairments                         400    
Accelerated Depreciation Expense                         400    
PE Films [Member] | RestructuringSeverance&EquipmentTransfers [Member] | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member]                              
Restructuring Cost and Reserve [Line Items]                              
RestructuringExpectedCashOutflows 4,000                       4,000    
PE Films [Member] | RestructuringCapExEquiptUpgrades [Member] | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member]                              
Restructuring Cost and Reserve [Line Items]                              
RestructuringExpectedCashOutflows 10,000                       10,000    
PE Films [Member] | Tredegar vs. 3M [Member]                              
Restructuring Cost and Reserve [Line Items]                              
Litigation Settlement, Amount               10,000              
Litigation Settlement Amount, Net of Tax               $ 6,800              
Aluminum Extrusions                              
Restructuring Cost and Reserve [Line Items]                              
Severance and other employee-related costs   35       0                  
Aluminum Extrusions | Aluminum Extrusions Manufacturing Facility In Newnan Georgia                              
Restructuring Cost and Reserve [Line Items]                              
Expected future environmental costs 300       700 75 200   1,500 100 85        
Expected future environmental costs after taxes 200       400 46 100   $ 900 62 53        
Aluminum Extrusions | Facility Closing | Aluminum Extrusions Manufacturing Facility In Kentland, Indiana                              
Restructuring Cost and Reserve [Line Items]                              
Plant shutdown related expenditures (31) (300) (18) (15) (11) (20) (24)     (45) (400) (200)      
Plant shutdown related expenditures after taxes (19) $ (200) $ (11) $ (9) (7) (12) $ (15)     $ (28) (200) (94)      
Aluminum Extrusions | AACOA                              
Restructuring Cost and Reserve [Line Items]                              
Integration-related expenses and other non-recurring transactions                     90 100      
Integration-related expenses and other non-recurring transactions after taxes                     $ 54 $ 63      
Flexible packaging films                              
Restructuring Cost and Reserve [Line Items]                              
Severance and other employee-related costs         $ 300 $ 300                  
Minimum | PE Films [Member] | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member]                              
Restructuring Cost and Reserve [Line Items]                              
Restructuring and Related Cost, Expected Cost 4,000                       4,000    
RestructuringExpectedCashOutflows 15,000                       15,000    
Restructuring Future Annual Cost Savings 5,000                       5,000    
Minimum | PE Films [Member] | Employee Severance [Member] | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member]                              
Restructuring Cost and Reserve [Line Items]                              
Restructuring and Related Cost, Expected Cost 2,000                       2,000    
Maximum | PE Films [Member] | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member]                              
Restructuring Cost and Reserve [Line Items]                              
Restructuring and Related Cost, Expected Cost 5,000                       5,000    
RestructuringExpectedCashOutflows 16,000                       16,000    
Restructuring Future Annual Cost Savings 6,000                       6,000    
Maximum | PE Films [Member] | Employee Severance [Member] | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member]                              
Restructuring Cost and Reserve [Line Items]                              
Restructuring and Related Cost, Expected Cost 3,000                       $ 3,000    
Selling, General and Administrative Expenses [Member]                              
Restructuring Cost and Reserve [Line Items]                              
Severance and other employee-related costs $ 400                            
[1] See Notes 1, 3, 4 and 18 for more information on losses associated with plant shutdowns, asset impairments and restructurings, unusual items, gains or losses from sale of assets, gains or losses on an investment accounted for under the fair value method and other items.