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Losses Associated With Plant Shutdowns, Asset Impairments And Restructurings, Unusual Items, Gains From Sale Of Assets And Other Items (Details)
 3 Months Ended 9 Months Ended 12 Months Ended 18 Months Ended
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
employee
Sep. 30, 2014
USD ($)
Jun. 30, 2014
USD ($)
Mar. 31, 2014
USD ($)
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
employee
Dec. 31, 2016
USD ($)
Restructuring Cost and Reserve [Line Items]                                  
Severance and other employee-related costs   $ 300,000     $ 1,100,000 $ 900,000 $ 300,000   $ 500,000 $ 400,000              
Asset impairments                           $ 1,436,000 $ 403,000 $ 993,000  
Severance and other employee-related costs after taxes   200,000     700,000 600,000 200,000   300,000 200,000              
Business Development Expenses       $ 400,000 1,000,000                        
Business Development Expenses net of taxes                         $ 200,000        
Business Development Expenses Net Of Tax         600,000                        
Unrealized gain (loss) on investments under fair value method                           1,600,000 (20,500,000) 2,000,000  
Losses Associated with Plant Shutdowns, Asset Impairments, Restructurings & Other                           6,100,000 10,100,000 13,800,000  
Losses Associated with Plant Shutdowns, Asset Impairments, Restructurings & Other After Taxes                           3,900,000 6,400,000 9,300,000  
Payments for Restructuring                           1,540,000 2,027,000 3,039,000  
kaleo                                  
Restructuring Cost and Reserve [Line Items]                                  
Unrealized gain (loss) on investments under fair value method [1]                           1,600,000 (20,500,000) 2,000,000  
Unrealized gain (loss) on investments, net of tax                           1,200,000 (15,700,000) 1,000,000  
Harbinger                                  
Restructuring Cost and Reserve [Line Items]                                  
Unrealized loss on investments under fair value method, other than temporary impairment                               800,000  
Unrealized loss on investments under fair value method, other than temporary impairment, after taxes                               400,000  
Alleghany and Bath County, Virginia                                  
Restructuring Cost and Reserve [Line Items]                                  
Unrealized gain (loss) on investments under fair value method $ 1,000,000                         1,032,000      
Gain (Loss) on Disposition of Assets                           0 0 1,208,000  
Unrealized Gain (Loss) on Investment Property                           (1,032,000) 0 0  
Unrealized Gain Loss On Investment Property After Tax (700,000)                         (700,000)      
Gain (Loss) on Sale of Investment Property, After Tax                               800,000  
Aluminum Extrusions [Member]                                  
Restructuring Cost and Reserve [Line Items]                                  
Gain (loss) on sale of equipment (200,000)                                
Gain (Loss) on Disposition of Property Plant Equipment, Net of Taxes (100,000)                                
Net Gain on Disposition of Property Plant Equipment net of shutdown loss 100,000                                
Net Gain on Disposition of Property Plant Equipment net of shutdown loss, Net of Taxes 100,000                                
Other Restructuring [Member] | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member]                                  
Restructuring Cost and Reserve [Line Items]                                  
Other Restructuring Costs 200,000 600,000 $ 800,000 500,000                   2,000,000      
Other Restructuring Costs after Taxes 100,000 400,000 500,000 300,000                   1,300,000      
Other Plant Consolidation Expenses - Cost of Goods Sold 200,000 400,000 700,000 400,000                   1,600,000      
Other Plant Consolidation Expenses - Cost of Goods Sold, Net of Taxes 100,000 200,000 400,000 200,000                   1,000,000      
Plant shutdown related expenditures 800,000 1,100,000 1,300,000 1,100,000                   4,300,000     $ 6,500,000
Plant Shutdown Related Expenditures Net, net of taxes 500,000 700,000 900,000 700,000                   2,800,000     4,100,000
Severance and other employee-related costs 300,000 300,000 400,000 300,000                   1,200,000      
Asset impairments 0 100,000 100,000 300,000                   400,000      
Accelerated Depreciation Expense 300,000 100,000 100,000 100,000                   600,000      
Accelerated Depreciation Expense taxes 200,000 100,000 100,000 100,000                   400,000      
Severance and other employee-related costs after taxes 200,000 200,000 200,000 200,000                   800,000      
Asset impairments after taxes 0 0 100,000 $ 200,000                   300,000      
Corporate Segment [Member]                                  
Restructuring Cost and Reserve [Line Items]                                  
Severance and other employee-related costs   200,000       26,000                      
Severance and other employee-related costs after taxes   100,000                              
Corporate [Member] [Domain]                                  
Restructuring Cost and Reserve [Line Items]                                  
Severance and other employee-related costs             3,900,000                    
Severance and other employee-related costs after taxes             2,500,000                    
Flexible Packaging Films [Member] [Domain]                                  
Restructuring Cost and Reserve [Line Items]                                  
Severance and other employee-related costs             300,000 $ (100,000)                  
Severance and other employee-related costs after taxes               0                  
PE Films [Member]                                  
Restructuring Cost and Reserve [Line Items]                                  
Severance and other employee-related costs   100,000       900,000 0   200,000 100,000 $ 600,000 $ 800,000          
Asset impairments 200,000                                
Severance and other employee-related costs after taxes   100,000                 400,000 500,000          
Asset impairments after taxes 100,000                                
PE Films [Member] | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member]                                  
Restructuring Cost and Reserve [Line Items]                                  
Other Plant Consolidation Expenses - Cost of Goods Sold                           2,200,000      
Other Plant Consolidation Expenses - Cost of Goods Sold, Net of Taxes                           1,400,000      
AcceleratedDepreciationExpectedCost 3,000,000                         3,000,000     3,000,000
Asset Impairment and Other Plant Shutdown Related Costs                           2,100,000      
Asset Impairment and Other Plant Shutdown Related Costs, Net of Taxes                           1,300,000      
Payments for Restructuring                           10,200,000     13,800,000
Capital Expenditures Restructuring Project                           8,200,000     11,100,000
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                 73,000                
PE Films [Member] | RestructuringProductQualifications [Member] | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member]                                  
Restructuring Cost and Reserve [Line Items]                                  
RestructuringExpectedCashOutflows 1,000,000                         1,000,000     1,000,000
PE Films [Member] | Facility Closing | Film Products Manufacturing Facility in Red Springs, NC                                  
Restructuring Cost and Reserve [Line Items]                                  
Plant shutdown related expenditures                 (100,000) 37,000 300,000 500,000       $ 700,000  
Plant shutdown related expenditures after taxes                 $ 63,000 (23,000) (200,000) (300,000)          
Severance and other employee-related costs                       400,000          
Asset Impairment and Other Plant Shutdown Related Costs                       $ 300,000          
Number of employees employed | employee                 66             66  
PE Films [Member] | Other Restructuring [Member] | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member]                                  
Restructuring Cost and Reserve [Line Items]                                  
Other Restructuring Costs                             600,000    
Other Plant Consolidation Expenses - Cost of Goods Sold                             100,000    
Restructuring and Related Cost, Expected Cost 2,000,000                         2,000,000     2,000,000
Plant shutdown related expenditures         1,000,000 1,200,000                      
Plant shutdown related expenditures after taxes         (600,000) (700,000)                      
Severance and other employee-related costs                             800,000    
Asset impairments                             400,000    
Accelerated Depreciation Expense                             $ 400,000    
PE Films [Member] | RestructuringSeverance&EquipmentTransfers [Member] | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member]                                  
Restructuring Cost and Reserve [Line Items]                                  
RestructuringExpectedCashOutflows 5,000,000                         5,000,000     5,000,000
PE Films [Member] | RestructuringCapExEquiptUpgrades [Member] | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member]                                  
Restructuring Cost and Reserve [Line Items]                                  
RestructuringExpectedCashOutflows 11,000,000                         11,000,000     11,000,000
PE Films [Member] | RestructuringSafetyQualityIncentives [Member] | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member]                                  
Restructuring Cost and Reserve [Line Items]                                  
RestructuringExpectedCashOutflows 1,000,000                         1,000,000     1,000,000
PE Films [Member] | Tredegar vs. 3M [Member]                                  
Restructuring Cost and Reserve [Line Items]                                  
Litigation Settlement, Amount                     10,000,000            
Litigation Settlement Amount, Net of Tax                     6,800,000            
Aluminum Extrusions [Member]                                  
Restructuring Cost and Reserve [Line Items]                                  
Severance and other employee-related costs           35,000       0              
Business Development Expenses 600,000                                
Business Development Expenses net of taxes 400,000                                
Cast House Explosion pretax income/loss 700,000 (1,700,000)                              
Cast House Explosion income/loss net of taxes 400,000 (1,100,000)                              
Excess production costs for which recovery from insurance is not assured 600,000                                
Excess production costs for which recovery from insurance is not assured, net of taxes 400,000                                
Loss from Catastrophes   (50,000) 600,000                            
Loss from Catastrophes net of taxes   (31,525) $ 400,000                            
Insured Event, Gain (Loss) 100,000 (1,900,000)                              
Insured Event, Gain (Loss), net of taxes 100,000 (1,200,000)                              
Tangible Asset Impairment Charges   300,000                              
Tangible Asset Impairment Charges net of taxes   200,000                              
Aluminum Extrusions [Member] | Aluminum Extrusions Manufacturing Facility In Newnan Georgia                                  
Restructuring Cost and Reserve [Line Items]                                  
Expected future environmental costs 500,000       300,000       $ 700,000 75,000 200,000            
Expected future environmental costs after taxes 300,000       200,000       400,000 46,000 100,000            
Aluminum Extrusions [Member] | Facility Closing | Aluminum Extrusions Manufacturing Facility In Kentland, Indiana                                  
Restructuring Cost and Reserve [Line Items]                                  
Plant shutdown related expenditures 61,000 300,000     31,000 300,000 18,000 15,000 11,000 20,000 24,000            
Plant Shutdown Related Expenditures Net, net of taxes 39,000 $ 200,000                              
Plant shutdown related expenditures after taxes         (19,000) $ (200,000) $ (11,000) $ (9,000) (7,000) (12,000) $ (15,000)            
Flexible packaging films                                  
Restructuring Cost and Reserve [Line Items]                                  
Severance and other employee-related costs                 $ 300,000 $ 300,000              
Application of Prior Period Brazilian Value-added Tax Credits 300,000                                
Application of Prior Period Brazilian Value added Tax Credits after Taxes 200,000                                
Business Acquisition, Preacquisition Contingency, Amount of Settlement 100,000                         100,000     100,000
Business Acquisition, Preacquisition Contingency, Amount of Settlement, Net of Taxes 0                         0     0
Minimum | PE Films [Member] | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member]                                  
Restructuring Cost and Reserve [Line Items]                                  
Restructuring and Related Cost, Expected Cost 5,000,000                         5,000,000     5,000,000
RestructuringExpectedCashOutflows 16,000,000                         16,000,000     16,000,000
Restructuring Future Annual Cost Savings 5,000,000                         5,000,000     5,000,000
Minimum | PE Films [Member] | Employee Severance [Member] | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member]                                  
Restructuring Cost and Reserve [Line Items]                                  
Restructuring and Related Cost, Expected Cost 3,000,000                         3,000,000     3,000,000
Maximum | PE Films [Member] | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member]                                  
Restructuring Cost and Reserve [Line Items]                                  
Restructuring and Related Cost, Expected Cost 6,000,000                         6,000,000     6,000,000
RestructuringExpectedCashOutflows 17,000,000                         17,000,000     17,000,000
Restructuring Future Annual Cost Savings 6,000,000                         6,000,000     6,000,000
Maximum | PE Films [Member] | Employee Severance [Member] | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member]                                  
Restructuring Cost and Reserve [Line Items]                                  
Restructuring and Related Cost, Expected Cost $ 4,000,000                         $ 4,000,000     $ 4,000,000
Selling, General and Administrative Expenses [Member]                                  
Restructuring Cost and Reserve [Line Items]                                  
Severance and other employee-related costs         $ 400,000                        
[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.