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Plants Shutdowns, Asset Impairments, Restructurings And Other (Narrative) (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended 27 Months Ended
Sep. 30, 2017
Jun. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Sep. 30, 2017
Restructuring Cost and Reserve [Line Items]              
Payments to Acquire Property, Plant, and Equipment       $ 37,245,000 $ 30,912,000    
Production LIne Start-up and Ramp-up Costs $ 700,000     3,500,000      
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 12,696,000   $ 9,379,000 65,847,000 24,602,000    
Business Development Expenses 200,000     1,100,000 400,000    
Pretax charges for severance and other employee-related costs     300,000 400,000 300,000    
(Gain)/loss on asset impairments and divestitures       50,000 412,000    
Other Non-Operating and Non-Recurring Charges [Abstract]              
Unrealized gain (loss) on investment under fair value method       24,800,000 (200,000)    
Gain (Loss) on Disposition of Assets       412,000 0    
Payments for Restructuring       1,375,000      
Restructuring Reserve 1,636,000     1,636,000   $ 2,408,000 $ 1,636,000
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Other Non-Operating and Non-Recurring Charges [Abstract]              
Unrealized gain (loss) on investment under fair value method 0   (1,300,000) 24,800,000 (200,000)    
Unrealized gain (loss) on investment under fair value method, after taxes     (1,000,000) $ 18,200,000 (200,000)    
Fair Value Inputs, Discount Rate       45.00%   45.00%  
Futura Industries [Member]              
Restructuring Cost and Reserve [Line Items]              
Net Business Combination Acquisition, Integration Costs and Other Related Costs       $ 3,300,000      
Business Combination, Inventory FV Adj       1,700,000      
Business Combination, Acquisition Related Costs       1,500,000      
Business Combination, Integration Related Costs       100,000      
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Asset   $ (700,000)   (700,000)      
Futura Industries [Member]              
Restructuring Cost and Reserve [Line Items]              
Payments to Acquire Property, Plant, and Equipment 500,000     1,300,000      
Flexible Packaging Films [Member]              
Restructuring Cost and Reserve [Line Items]              
Businesss Combination Settlement of Escrow Account       11,900,000      
Loss Contingency, Estimate of Possible Loss 3,500,000     3,500,000     3,500,000
Foreign Income Tax Expense (Benefit), Continuing Operations   $ 400,000          
PE Films              
Restructuring Cost and Reserve [Line Items]              
Production LIne Start-up and Ramp-up Costs 600,000     3,000,000      
Pretax charges for severance and other employee-related costs 100,000   100,000 100,000 100,000    
Aluminum Extrusions              
Restructuring Cost and Reserve [Line Items]              
Production LIne Start-up and Ramp-up Costs 100,000     500,000      
Cast House Explosion pretax income     (1,700,000) 500,000 (1,100,000)    
Insured Event, Gain (Loss)     1,900,000   1,900,000 $ 600,000  
Tangible Asset Impairment Charges     (300,000)   (300,000)    
Loss from Catastrophes     (50,000) 100,000 (500,000)    
Corporate Segment [Member]              
Restructuring Cost and Reserve [Line Items]              
Pretax charges for severance and other employee-related costs     200,000 300,000 200,000    
Severance (a)              
Other Non-Operating and Non-Recurring Charges [Abstract]              
Payments for Restructuring       1,068,000      
Restructuring Reserve 1,086,000     1,086,000   $ 1,854,000 1,086,000
Aluminum Extrusions Manufacturing Facility In Kentland Indiana [Member] | Facility Closing | Aluminum Extrusions              
Restructuring Cost and Reserve [Line Items]              
Plant shutdown related expenditures 200,000   300,000 200,000 300,000    
Aluminum Extrusions Manufacturing Facility In Newnan Georgia [Member] | Aluminum Extrusions              
Other Non-Operating and Non-Recurring Charges [Abstract]              
Environmental Exit Costs, Anticipated Cost       400,000      
FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | PE Films              
Other Non-Operating and Non-Recurring Charges [Abstract]              
Payments for Restructuring       1,400,000     15,500,000
Capital Expenditures Restructuring Project       100,000     11,200,000
Restructuring Reserve 1,000,000     1,000,000     1,000,000
FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | Other Restructuring [Member]              
Restructuring Cost and Reserve [Line Items]              
Plant Shutdown Related Expenditures Gross $ 200,000     800,000      
Plant shutdown related expenditures     1,100,000 800,000 3,600,000   $ 7,300,000
Pretax charges for severance and other employee-related costs     300,000 100,000 900,000    
(Gain)/loss on asset impairments and divestitures     100,000 100,000 400,000    
Accelerated Depreciation Expense     100,000 200,000 400,000    
Other Restructuring Costs     600,000 500,000 1,900,000    
Other Plant Consolidation Expenses - Cost of Goods Sold     $ 400,000   $ 1,400,000    
Pension Plan [Member]              
Restructuring Cost and Reserve [Line Items]              
Defined Benefit Plan Estimated Required Future Employer Contributions In Current Fiscal Year       $ 6,000,000