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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 18 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2020
Restructuring Cost and Reserve [Line Items]      
Gain (loss) on investment in kaléo accounted for under fair value method $ (26,100) $ 17,082  
Severance Costs 175    
Losses Associated With Plant Shutdowns Asset Impairments Restructurings Unusual Items Gains Losses From Sale Of Assets Other Items 239    
Other Restructuring Costs 47    
Restructuring and Related Cost, Incurred Cost 461    
Restructuring Reserve [Roll Forward]      
Balance at January 1, 2020 1,380    
Cash payments 793    
(239)    
Balance at March 31, 2020 809    
Severance      
Restructuring Cost and Reserve [Line Items]      
Severance Costs 47    
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 (28)    
0    
Balance at March 31, 2020 748    
Long Lived Asset Impairment [Member]      
Restructuring Reserve [Roll Forward]      
Balance at January 1, 2020 0    
Cash payments 0    
(239)    
Balance at March 31, 2020 0    
Other      
Restructuring Cost and Reserve [Line Items]      
Severance Costs (721)    
Restructuring Reserve [Roll Forward]      
Balance at January 1, 2020 86    
Cash payments 72    
0    
Balance at March 31, 2020 61    
PE Films | Other Restructuring [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring and Related Cost, Incurred Cost 75    
kaleo [Member]      
Restructuring Cost and Reserve [Line Items]      
Gain (loss) on investment in kaléo accounted for under fair value method 26,100 $ (17,082)  
Personal Care Materials [Member] | PE Films | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | Other Restructuring [Member]      
Restructuring Cost and Reserve [Line Items]      
Severance Costs 128   $ 1,100
Losses Associated With Plant Shutdowns Asset Impairments Restructurings Unusual Items Gains Losses From Sale Of Assets Other Items 239    
Other Restructuring Costs 19   $ 5,100
Restructuring and Related Cost, Incurred Cost 386    
Restructuring Reserve [Roll Forward]      
Cash payments $ (300)