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Summary Of Significant Accounting Policies (Narrative) (Details). - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Summary Of Significant Accounting Policies [Line Items]                
Effect of Adoption on Share-Based Compensation           $ 1,100    
Foreign Income Tax Expense (Benefit), Continuing Operations         $ 13,300      
Interest Costs Capitalized         300 400 $ 300  
Foreign Currency Transaction Gain (Loss), before Tax         500 800 3,600  
Cash and cash equivalents $ 34,397 [1]     $ 36,491 [1] $ 34,397 [1] 36,491 [1] 29,511 $ 44,156
Investments, percentage of voting ownership interest 50.00%       50.00%      
Goodwill, Impairment Loss         $ 46,792 0 0  
Goodwill $ 81,404     128,208 $ 81,404 $ 128,208 $ 117,822  
Incremental shares excluded from the calculation of incremental shares attributable to stock options and restricted stock         128,200 397,669 726,475  
Asset Impairment Charges         $ 223 $ 101,282 $ 1,436  
Foreign Country                
Summary Of Significant Accounting Policies [Line Items]                
Cash and cash equivalents 31,100     32,700 $ 31,100 32,700    
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 24,066 13,696  
PE Films [Member]                
Summary Of Significant Accounting Policies [Line Items]                
Goodwill, Impairment Loss         (46,800) 0 $ 0  
Goodwill, Impairment Loss, Net of Tax   $ 38,200     38,200      
Flexible Packaging Films [Member]                
Summary Of Significant Accounting Policies [Line Items]                
Assets, Fair Value Disclosure 30,000     30,000 30,000 30,000    
Foreign Income Tax Expense (Benefit), Continuing Operations     $ 400          
Asset Impairment Charges 101,000     101,000 101,000 101,000    
Asset Impairment Charges After Taxes       $ 87,000 $ 87,000 $ 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 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 13 years    
Other Intangible Assets [Member] | Flexible Packaging Films [Member]                
Summary Of Significant Accounting Policies [Line Items]                
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)         $ 14,000      
Trade Names [Member] | Minimum                
Summary Of Significant Accounting Policies [Line Items]                
Finite-Lived Intangible Asset, Useful Life         2 years      
Trade Names [Member] | Maximum                
Summary Of Significant Accounting Policies [Line Items]                
Finite-Lived Intangible Asset, Useful Life         12 years      
Trade Names [Member] | Flexible Packaging Films [Member]                
Summary Of Significant Accounting Policies [Line Items]                
Finite-Lived Trade Names, Gross 2,400       $ 2,400      
Trade Names [Member] | Flexible Packaging Films [Member]                
Summary Of Significant Accounting Policies [Line Items]                
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)         4,000      
Goodwill [Member] | Futura [Member]                
Summary Of Significant Accounting Policies [Line Items]                
Goodwill 10,400       10,400      
Goodwill [Member] | Aacoa [Member]                
Summary Of Significant Accounting Policies [Line Items]                
Goodwill 13,700       13,700      
Goodwill [Member] | Surface protection films                
Summary Of Significant Accounting Policies [Line Items]                
Goodwill $ 57,300       $ 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 $31.1 million and $32.7 million at December 31, 2018 and 2017, 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.