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Summary Of Significant Accounting Policies (Narrative) (Details). - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2019
Dec. 31, 2016
Summary Of Significant Accounting Policies [Line Items]          
Operating Lease, Right-of-Use Asset $ 19,220 $ 0   $ 21,000  
Interest Costs Capitalized 900 300 $ 400    
Foreign Currency Transaction Gain (Loss), before Tax 700 500 800    
Cash and cash equivalents $ 31,422 [1] 34,397 [1] 36,491   $ 29,511
Investments, percentage of voting ownership interest 50.00%        
Goodwill, Impairment Loss $ 0 46,792 0    
Goodwill $ 81,404 $ 81,404 $ 128,208    
Incremental shares excluded from the calculation of incremental shares attributable to stock options and restricted stock 209,592 726,475 397,669    
Asset Impairment Charges $ 519 $ 223 $ 101,282    
Operating Lease, Liability, Noncurrent 17,689     $ 22,000  
Foreign Country          
Summary Of Significant Accounting Policies [Line Items]          
Cash and cash equivalents $ 23,000 31,100      
Minimum | Buildings And Land Improvements          
Summary Of Significant Accounting Policies [Line Items]          
Average useful life 5 years        
Minimum | Machinery and Equipment          
Summary Of Significant Accounting Policies [Line Items]          
Average useful life 2 years        
Maximum | Buildings And Land Improvements          
Summary Of Significant Accounting Policies [Line Items]          
Average useful life 40 years        
Maximum | Machinery and Equipment          
Summary Of Significant Accounting Policies [Line Items]          
Average useful life 20 years        
Aluminum Extrusions          
Summary Of Significant Accounting Policies [Line Items]          
Goodwill, Impairment Loss $ 0        
Goodwill 24,066 24,066 24,066    
PE Films [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Goodwill, Impairment Loss 0 (46,792)      
Goodwill, Impairment Loss, Net of Tax $ 38,200        
Flexible Packaging Films [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Assets, Fair Value Disclosure   $ 30,000      
Foreign Income Tax Expense (Benefit), Continuing Operations     400    
Asset Impairment Charges     101,000    
Asset Impairment Charges After Taxes     $ 87,000    
Customer Relationships [Member] | Minimum          
Summary Of Significant Accounting Policies [Line Items]          
Finite-Lived Intangible Asset, Useful Life 10 years        
Customer Relationships [Member] | Maximum          
Summary Of Significant Accounting Policies [Line Items]          
Finite-Lived Intangible Asset, Useful Life 12 years        
Customer Relationships [Member] | Flexible Packaging Films [Member] | Minimum          
Summary Of Significant Accounting Policies [Line Items]          
Finite-Lived Intangible Asset, Useful Life   5 years      
Customer Relationships [Member] | Flexible Packaging Films [Member] | Maximum          
Summary Of Significant Accounting Policies [Line Items]          
Finite-Lived Intangible Asset, Useful Life   13 years      
Trade Names [Member] | Minimum          
Summary Of Significant Accounting Policies [Line Items]          
Finite-Lived Intangible Asset, Useful Life 5 years        
Trade Names [Member] | Maximum          
Summary Of Significant Accounting Policies [Line Items]          
Finite-Lived Intangible Asset, Useful Life 13 years        
Goodwill [Member] | Futura [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Goodwill $ 10,400        
Goodwill [Member] | Aacoa [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Goodwill 13,700        
Goodwill [Member] | Surface protection films          
Summary Of Significant Accounting Policies [Line Items]          
Goodwill $ 57,300        
[1] Information on exports and foreign operations are provided on the previous page. Cash and cash equivalents includes funds held in locations outside the U.S. of $23.0 million and $31.1 million at December 31, 2019 and 2018, respectively. Export sales relate almost entirely to PE Films. Operations outside the U.S. in The Netherlands, Hungary, China and India also relate to PE Films. Operations in Brazil are primarily related to Flexible Packaging Films, but also include PE Films operations. Sales from locations in The Netherlands and Hungary are primarily to customers located in Europe. Sales from locations in China (Guangzhou and Shanghai) are primarily to customers located in China, but also include other customers in Asia.