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Business Segments (Schedule Of Identifiable Assets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Revenue from External Customer [Line Items]    
Total assets $ 356,357 $ 446,461
Cash and cash equivalents 7,062 13,051
Discontinued operations 126 84,466
Operating Segments    
Revenue from External Customer [Line Items]    
Total assets 356,357 446,461
Cash and cash equivalents 7,062 13,051
PE Films | Operating Segments    
Revenue from External Customer [Line Items]    
Total assets 55,081 56,536
General corporate    
Revenue from External Customer [Line Items]    
Total assets 46,883 36,652
General corporate | Operating Segments    
Revenue from External Customer [Line Items]    
Total assets 46,883 36,652
Subtotal | Operating Segments    
Revenue from External Customer [Line Items]    
Total assets 302,286 312,292
Aluminum Extrusions | Operating Segments    
Revenue from External Customer [Line Items]    
Total assets $ 247,205 $ 255,756