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Losses Associated With Plant Shutdowns, Asset Impairments And Restructurings, Unusual Items, Gains From Sale Of Assets And Other Items (Details) - USD ($)
 3 Months Ended 12 Months Ended 30 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2017
Dec. 31, 2014
Restructuring Cost and Reserve [Line Items]                                  
Severance and other employee-related costs           $ 300,000     $ 1,100,000 $ 900,000 $ 300,000            
Loss on asset impairments                         $ 101,282,000 $ 1,436,000 $ 403,000    
Severance and other employee-related costs after taxes           200,000     700,000 600,000 200,000            
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                         33,800,000 1,600,000 (20,500,000)    
Losses Associated with Plant Shutdowns, Asset Impairments, Restructurings & Other                         93,992,000 [1] 6,100,000 10,100,000    
Losses Associated with Plant Shutdowns, Asset Impairments, Restructurings & Other After Taxes                         79,204,000 [1] 3,900,000 6,400,000    
Payments for Restructuring                         2,198,000 1,540,000 2,027,000    
Restructuring Reserve $ 1,103,000       $ 2,408,000       1,867,000       1,103,000 2,408,000 1,867,000 $ 1,103,000 $ 447,000
kaleo                                  
Restructuring Cost and Reserve [Line Items]                                  
Unrealized gain (loss) on investments under fair value method         1,600,000               33,800,000 [1] 1,600,000 [1] (20,500,000) [1]    
Unrealized gain (loss) on investments, net of tax         1,200,000               24,000,000   (15,700,000)    
Alleghany and Bath County, Virginia                                  
Restructuring Cost and Reserve [Line Items]                                  
Unrealized gain (loss) on investments under fair value method         1,000,000               0 (1,032,000) 0    
Unrealized Gain (Loss) on Investment Property                         0 (1,032,000) 0    
Unrealized Gain Loss On Investment Property After Tax         (700,000)                 700,000      
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 $ 300,000 200,000 600,000 $ 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     100,000 200,000 200,000 400,000 700,000 400,000           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         800,000 4,300,000   7,300,000  
Plant Shutdown Related Expenditures Net, net of taxes   $ 100,000 200,000 400,000 500,000 700,000 900,000 700,000         500,000 2,800,000      
Severance and other employee-related costs     300,000 200,000 300,000 300,000 400,000 300,000           1,200,000      
Loss on asset impairments         0 100,000 100,000 300,000           400,000      
Accelerated Depreciation Expense     100,000 100,000 300,000 100,000 100,000 100,000           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   200,000 200,000 200,000 200,000           800,000      
Plant Shutdown Related Expenditures Gross   200,000 300,000 700,000                          
Asset impairments after taxes         0 0 100,000 $ 200,000           300,000      
Futura Industries [Member]                                  
Restructuring Cost and Reserve [Line Items]                                  
Net Business Combination Acquisition, Integration Costs and Other Related Costs       3,300,000                          
Net Business Combination Acquisition, Integration Costs and Other Related Costs, Net of Taxes       2,000,000                          
Reversal of Fair Value Inventory Acquisition Write-Up       1,700,000                          
Acquisition-related expenses       1,500,000                          
Business Combination, Integration Related Costs       100,000                          
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Asset     700,000                            
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Asset, Net of Taxes     (500,000)                            
Corporate Segment [Member]                                  
Restructuring Cost and Reserve [Line Items]                                  
Expected future environmental costs 800,000                                
Expected future environmental costs after taxes 500,000                                
Severance and other employee-related costs 100,000     300,000   200,000       26,000              
Severance and other employee-related costs after taxes 100,000     200,000   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 100,000 100,000       100,000       900,000 0            
Loss on asset impairments 0       200,000                        
Severance and other employee-related costs after taxes 100,000 100,000       100,000                      
Production LIne Start-up and Ramp-up Costs 600,000 600,000 900,000 1,400,000                          
Production LIne Start-up and Ramp-up Costs, Net of Taxes 600,000 500,000 800,000 1,300,000                          
Asset impairments after taxes 300,000       100,000                        
PE Films [Member] | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member]                                  
Restructuring Cost and Reserve [Line Items]                                  
Payments for Restructuring                         1,900,000     16,000,000  
Capital Expenditures Restructuring Project                         100,000     11,200,000  
Restructuring Reserve 500,000                       500,000     500,000  
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              
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              
Loss on asset impairments                           400,000      
Accelerated Depreciation Expense                   400,000              
Aluminum Extrusions [Member]                                  
Restructuring Cost and Reserve [Line Items]                                  
Severance and other employee-related costs 100,000                 35,000              
Severance and other employee-related costs after taxes 100,000                                
Business Development Expenses         600,000                        
Business Development Expenses net of taxes         400,000                        
Cast House Explosion pretax income/loss 5,100,000   900,000 400,000 700,000 (1,700,000)             5,300,000 1,900,000 0    
Cast House Explosion income/loss net of taxes 3,200,000       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 200,000     100,000   (50,000) 600,000                    
Loss from Catastrophes net of taxes 100,000   600,000 200,000   (31,525) $ 400,000                    
Insured Event, Gain (Loss) 5,300,000     300,000 100,000 (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                      
Production LIne Start-up and Ramp-up Costs   100,000 100,000 300,000                          
Production LIne Start-up and Ramp-up Costs, Net of Taxes   100,000 100,000 200,000                          
Aluminum Extrusions [Member] | Aluminum Extrusions Manufacturing Facility In Carthage Tennessee [Member] [Member]                                  
Restructuring Cost and Reserve [Line Items]                                  
Expected future environmental costs 1,500,000     400,000                          
Expected future environmental costs after taxes 1,000,000     200,000                          
Professional Fees 400,000                                
Professional Fees, net of taxes 200,000                                
Business Development Expenses 1,300,000 200,000 600,000 300,000                          
Business Development Expenses net of taxes 800,000 100,000 400,000 $ 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                
Expected future environmental costs after taxes         300,000       200,000                
Aluminum Extrusions [Member] | Facility Closing | Aluminum Extrusions Manufacturing Facility In Kentland, Indiana                                  
Restructuring Cost and Reserve [Line Items]                                  
Plant shutdown related expenditures 61,000 200,000       300,000     31,000 300,000 18,000 15,000          
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)          
Net Gain on Disposition of Property Plant Equipment net of shutdown loss, Net of Taxes   $ 100,000                              
Flexible packaging films                                  
Restructuring Cost and Reserve [Line Items]                                  
Loss on asset impairments 101,000,000                       101,000,000        
Application of Prior Period Brazilian Value-added Tax Credits         300,000                        
Application of Prior Period Brazilian Value added Tax Credits after Taxes         200,000                        
Businesss Combination Settlement of Escrow Account     11,900,000                   11,900,000 0 $ 0    
Business Combination Settlement of Escrow Account, Net of Taxes     $ 11,900,000                            
Loss Contingency, Estimate of Possible Loss 3,500,000                       3,500,000     3,500,000  
Asset impairments after taxes 87,000,000                       87,000,000        
Assets, Fair Value Disclosure $ 30,000,000                       $ 30,000,000     $ 30,000,000  
Business Acquisition, Preacquisition Contingency, Amount of Settlement         100,000                 100,000      
Business Acquisition, Preacquisition Contingency, Amount of Settlement, Net of Taxes         $ 0                 $ 0      
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 17 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.