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Plants Shutdowns, Asset Impairments, Restructurings And Other (Narrative) (Details) - USD ($)
 3 Months Ended 21 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Restructuring Cost and Reserve [Line Items]      
Production LIne Start-up and Ramp-up Costs $ 1,700,000    
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 6,121,000 $ 10,497,000  
Business Development Expenses 300,000 400,000  
Pretax charges for severance and other employee-related costs 300,000    
(Gain)/loss on asset impairments and divestitures 50,000 256,000  
Other Non-Operating and Non-Recurring Charges [Abstract]      
Unrealized gain (loss) on investment under fair value method 3,300,000 800,000  
Gain (Loss) on Disposition of Assets 164,000 0  
Payments for Restructuring 297,000    
kaleo      
Other Non-Operating and Non-Recurring Charges [Abstract]      
Unrealized gain (loss) on investment under fair value method 3,300,000 800,000  
Unrealized gain (loss) on investment under fair value method, after taxes 2,500,000 600,000  
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    
PE Films      
Restructuring Cost and Reserve [Line Items]      
Production LIne Start-up and Ramp-up Costs 1,400,000    
Aluminum Extrusions      
Restructuring Cost and Reserve [Line Items]      
Production LIne Start-up and Ramp-up Costs 300,000    
Cast House Explosion pretax income (400,000)    
Insured Event, Gain (Loss) (300,000)    
Loss from Catastrophes 50,000    
Severance      
Other Non-Operating and Non-Recurring Charges [Abstract]      
Payments for Restructuring 227,000    
Aluminum Extrusions Manufacturing Facility In Newnan Georgia [Member] | Aluminum Extrusions      
Other Non-Operating and Non-Recurring Charges [Abstract]      
Environmental Exit Costs, Anticipated Cost 300,000    
FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | PE Films      
Restructuring Cost and Reserve [Line Items]      
Other Plant Consolidation Expenses - Cost of Goods Sold 300,000    
Pretax loss for asset impairments 400,000    
Other Non-Operating and Non-Recurring Charges [Abstract]      
Payments for Restructuring 400,000   $ 14,100,000
Capital Expenditures Restructuring Project 100,000   11,200,000
FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | Other Restructuring [Member]      
Restructuring Cost and Reserve [Line Items]      
Plant shutdown related expenditures 700,000 1,100,000 7,200,000
Pretax charges for severance and other employee-related costs 200,000 300,000  
(Gain)/loss on asset impairments and divestitures 100,000 200,000  
Accelerated Depreciation Expense 100,000 100,000  
Other Restructuring Costs 300,000 500,000  
Other Plant Consolidation Expenses - Cost of Goods Sold 200,000 $ 400,000  
FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | RestructuringSeverance&EquipmentTransfers [Member] | PE Films      
Restructuring Cost and Reserve [Line Items]      
RestructuringExpectedCashOutflows 5,000,000   5,000,000
FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | RestructuringCapExEquiptUpgrades [Member] | PE Films      
Restructuring Cost and Reserve [Line Items]      
RestructuringExpectedCashOutflows 11,000,000   11,000,000
FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | RestructuringSafetyQualityIncentives [Member] | PE Films      
Restructuring Cost and Reserve [Line Items]      
RestructuringExpectedCashOutflows 1,000,000   1,000,000
FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | RestructuringProductQualifications [Member] | PE Films      
Restructuring Cost and Reserve [Line Items]      
RestructuringExpectedCashOutflows 1,000,000   1,000,000
Minimum | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | PE Films      
Restructuring Cost and Reserve [Line Items]      
Restructuring and Related Cost, Expected Cost 5,000,000   5,000,000
RestructuringExpectedCashOutflows 16,000,000   16,000,000
Minimum | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | Severance | PE Films      
Restructuring Cost and Reserve [Line Items]      
Restructuring and Related Cost, Expected Cost 2,000,000   2,000,000
Maximum | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | PE Films      
Restructuring Cost and Reserve [Line Items]      
Restructuring and Related Cost, Expected Cost 6,000,000   6,000,000
RestructuringExpectedCashOutflows 17,000,000   17,000,000
Maximum | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | Severance | PE Films      
Restructuring Cost and Reserve [Line Items]      
Restructuring and Related Cost, Expected Cost 3,000,000   $ 3,000,000
Pension Plan [Member]      
Restructuring Cost and Reserve [Line Items]      
Defined Benefit Plan Estimated Required Future Employer Contributions In Current Fiscal Year $ 6,000,000