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Losses Associated With Plant Shutdowns, Asset Impairments And Restructurings, Unusual Items, Gains From Sale Of Assets And Other Items Shanghai Plant Shutdown (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended 19 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2019
Dec. 31, 2019
Restructuring Cost and Reserve [Line Items]                          
Payments for Restructuring                 $ 3,099 $ 2,198 $ 1,540    
Severance Costs               $ 300          
Severance Costs After Taxes               200          
Loss on asset impairments                 223 $ 101,282 $ 1,436    
PE Films [Member]                          
Restructuring Cost and Reserve [Line Items]                          
Severance Costs $ 300 $ 300   $ 100 $ 100 $ 100   100          
Severance Costs After Taxes 300 200   100 100 $ 100   $ 100          
Loss on asset impairments         0   $ 200            
Asset Impairment Charges After Taxes         $ 300   $ 100            
Other Restructuring [Member] | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member]                          
Restructuring Cost and Reserve [Line Items]                          
Severance Costs 500 1,300 $ 400 0         2,200        
Severance Costs After Taxes 500 1,300 400 0         2,200        
Accelerated Depreciation Expense 100 400 100 0         600        
Accelerated Depreciation Expense taxes 100 400 100 0         600        
Other Restructuring Costs 300 100 100 0         500        
Other Restructuring Costs after Taxes 300 100 100 0         500        
Plant Shutdown Related Expenditures Net 900 1,800 600 0         3,300        
Plant Shutdown Related Expenditures Net, net of taxes 900 1,800 600 0         3,300        
Other Plant Consolidation Expenses - Cost of Goods Sold 300 700 200 0         1,200        
Other Plant Consolidation Expenses - Cost of Goods Sold, Net of Taxes $ 300 $ 700 $ 200 $ 0         1,200        
Other Restructuring [Member] | PE Films [Member] | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member]                          
Restructuring Cost and Reserve [Line Items]                          
Restructuring, Settlement and Impairment Provisions                       $ 5,000 $ 7,100
Asset Impairment And Costs Associated With Exit And Disposal Activities - impairment Line                 2,100        
Asset Impairment And Costs Associated With Exit And Disposal Activities - Cost of Goods Sold                 1,200        
Payments for Restructuring                 $ 2,500        
Severance Costs                         2,900
Accelerated Depreciation Expense                       $ 600 900
Restructuring and Disposal Activities - Anticipated Cash Cost Savings                         1,700
Other Restructuring Costs                         1,600
Other Plant Consolidation Expenses - Cost of Goods Sold                         $ 500