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Business Segments (Schedule Of Identifiable Assets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Revenue from External Customer [Line Items]        
Total assets $ 446,461 $ 542,093    
Cash and cash equivalents 13,455 19,232 $ 30,521 $ 11,846
Operating Segments        
Revenue from External Customer [Line Items]        
Total assets 446,461 542,093    
Cash and cash equivalents 13,455 19,232    
PE Films | Operating Segments        
Revenue from External Customer [Line Items]        
Total assets 56,536 102,431    
General corporate        
Revenue from External Customer [Line Items]        
Total assets 36,652 23,674    
General corporate | Operating Segments        
Revenue from External Customer [Line Items]        
Total assets 36,652 23,674    
Subtotal | Operating Segments        
Revenue from External Customer [Line Items]        
Total assets 396,354 499,187    
Aluminum Extrusions | Operating Segments        
Revenue from External Customer [Line Items]        
Total assets 255,756 293,308    
Flexible Packaging Films | Operating Segments        
Revenue from External Customer [Line Items]        
Total assets $ 84,062 $ 103,448