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Plants Shutdowns, Asset Impairments, Restructurings And Other (Schedule Of Accrued Expenses Associated With Asset Impairments And Exit And Disposal Activities) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 18 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2020
Restructuring Cost and Reserve [Line Items]          
Gain (loss) on investment in kaléo accounted for under fair value method     $ (24,800) $ 6,600  
Severance Costs     245    
Losses Associated With Plant Shutdowns Asset Impairments Restructurings Unusual Items Gains Losses From Sale Of Assets Other Items     11    
Other Restructuring Costs     341    
Restructuring and Related Cost, Incurred Cost     597    
Restructuring Reserve [Roll Forward]          
Balance at January 1, 2020     1,380    
Cash payments     1,534    
Charges against assets     (11)    
Restructuring Reserve, Ending Balance $ 432   432    
Severance          
Restructuring Cost and Reserve [Line Items]          
Severance Costs     77    
Losses Associated With Plant Shutdowns Asset Impairments Restructurings Unusual Items Gains Losses From Sale Of Assets Other Items     0    
Restructuring Reserve [Roll Forward]          
Balance at January 1, 2020     1,294    
Cash payments     (16)    
Charges against assets     0    
Restructuring Reserve, Ending Balance 391   391    
Long Lived Asset Impairment [Member]          
Restructuring Reserve [Roll Forward]          
Balance at January 1, 2020     0    
Cash payments     0    
Charges against assets     (11)    
Restructuring Reserve, Ending Balance 0   0    
Other          
Restructuring Cost and Reserve [Line Items]          
Severance Costs     (1,148)    
Restructuring Reserve [Roll Forward]          
Balance at January 1, 2020     86    
Cash payments     386    
Charges against assets     0    
Restructuring Reserve, Ending Balance 41   41    
PE Films | Other Restructuring [Member]          
Restructuring Cost and Reserve [Line Items]          
Restructuring and Related Cost, Incurred Cost     93    
kaleo [Member]          
Restructuring Cost and Reserve [Line Items]          
Gain (loss) on investment in kaléo accounted for under fair value method $ (1,300) $ (7,100) 24,800 $ 24,182  
Personal Care Materials [Member] | PE Films | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | Other Restructuring [Member]          
Restructuring Cost and Reserve [Line Items]          
Severance Costs     168   $ 1,100
Losses Associated With Plant Shutdowns Asset Impairments Restructurings Unusual Items Gains Losses From Sale Of Assets Other Items     11    
Other Restructuring Costs     325   $ 5,100
Restructuring and Related Cost, Incurred Cost     504    
Restructuring Reserve [Roll Forward]          
Cash payments     $ (700)