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Goodwill And Other Intangible Assets Goodwill and Other Intangible Assets (Rollforward Schedule of Identifiable Intangibles) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Net $ 14,152    
Disposal Group, Including Discontinued Operation, Intangible Assets   $ (490)  
PE Films [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Net 0 0 $ 610
Amortization 0 (120)  
Flexible Packaging Films [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Net 1,165 1,621 2,327
Amortization (392) (397)  
Finite Lived Intangible Assets, Foreign Currency Translation Gain (Loss) (64) (309)  
Aluminum Extrusions [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Net 12,987 17,199 19,699
Amortization (2,259) (2,500)  
Reclassification from customer relationship intangibles to goodwill (2,900)    
Impairment of Intangible Assets, Finite-lived 0 0 (10,040)
Customer Relationships [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Net 13,259 17,551  
Customer Relationships [Member] | PE Films [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Net 0 0 0
Amortization 0 0  
Disposal Group, Including Discontinued Operation, Intangible Assets 0    
Customer Relationships [Member] | Flexible Packaging Films [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Net 287 387 554
Amortization (82) (84)  
Finite Lived Intangible Assets, Foreign Currency Translation Gain (Loss) (18) (83)  
Customer Relationships [Member] | Aluminum Extrusions [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Net 12,972 17,164 19,644
Amortization (2,239) (2,480)  
Reclassification from customer relationships to goodwill, net amortization (1,953)    
Proprietary Technology [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Net 118 194  
Proprietary Technology [Member] | PE Films [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Net 0 0 610
Amortization 0 (120)  
Disposal Group, Including Discontinued Operation, Intangible Assets   (490)  
Proprietary Technology [Member] | Flexible Packaging Films [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Net 103 159 230
Amortization (53) (53)  
Finite Lived Intangible Assets, Foreign Currency Translation Gain (Loss) (3) (18)  
Proprietary Technology [Member] | Aluminum Extrusions [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Net 15 35 55
Amortization (20) (20)  
Trade Names [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Net 775 1,075  
Trade Names [Member] | PE Films [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Net 0 0 0
Amortization 0 0  
Disposal Group, Including Discontinued Operation, Intangible Assets 0    
Finite Lived Intangible Assets, Foreign Currency Translation Gain (Loss) (43)    
Trade Names [Member] | Flexible Packaging Films [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Net 775 1,075 1,543
Amortization (257) (260)  
Finite Lived Intangible Assets, Foreign Currency Translation Gain (Loss)   (208)  
Trade Names [Member] | Aluminum Extrusions [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Net 0 0 $ 0
Amortization $ 0 $ 0