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Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Jun. 30, 2017
Sep. 30, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Summary Of Significant Accounting Policies [Line Items]              
Effect of Adoption on Share-Based Compensation         $ 1,100 $ 300  
Foreign Income Tax Expense (Benefit), Continuing Operations       $ 13,300      
Interest Costs Capitalized       400 300 400  
Foreign Currency Transaction Gain (Loss), before Tax       800 3,600 (4,000)  
Cash and cash equivalents $ 36,491 [1]     $ 36,491 [1] 29,511 [1] 44,156 $ 50,056
Investments, percentage of voting ownership interest 50.00%     50.00%      
Goodwill, Impairment Loss       $ 0 0 44,465  
Goodwill $ 128,208     $ 128,208 $ 117,822 $ 117,839  
Incremental shares excluded from the calculation of incremental shares attributable to stock options and restricted stock       397,669 881,513 128,200  
Asset Impairment Charges       $ 101,282 $ 1,436 $ 403  
Foreign Country              
Summary Of Significant Accounting Policies [Line Items]              
Cash and cash equivalents $ 32,700     $ 32,700 23,800    
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      
Futura [Member]              
Summary Of Significant Accounting Policies [Line Items]              
Goodwill Fair Value in Excess of NBV 42.00%     42.00%      
Aacoa [Member]              
Summary Of Significant Accounting Policies [Line Items]              
Goodwill Fair Value in Excess of NBV 61.00%     61.00%      
Flexible Packaging Films [Member] [Domain]              
Summary Of Significant Accounting Policies [Line Items]              
Goodwill, Impairment Loss     $ 44,500 $ 0 0 44,465  
Goodwill, Impairment Loss, Net of Tax     $ 44,500        
Aluminum Extrusions              
Summary Of Significant Accounting Policies [Line Items]              
Goodwill $ 24,066     $ 24,066 $ 13,696 $ 13,696  
PE Films [Member]              
Summary Of Significant Accounting Policies [Line Items]              
Goodwill Fair Value in Excess of NBV 15.00%     15.00%      
Surface protection films              
Summary Of Significant Accounting Policies [Line Items]              
Goodwill Fair Value in Excess of NBV 100.00%     100.00%      
Flexible Packaging Films [Member]              
Summary Of Significant Accounting Policies [Line Items]              
Assets, Fair Value Disclosure $ 30,000     $ 30,000      
Foreign Income Tax Expense (Benefit), Continuing Operations   $ 400          
Asset Impairment Charges 101,000     101,000      
Asset Impairment Charges After Taxes 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      
Customer Relationships [Member] | Flexible Packaging Films [Member] | Maximum              
Summary Of Significant Accounting Policies [Line Items]              
Finite-Lived Intangible Asset, Useful Life       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] | PE Films [Member]              
Summary Of Significant Accounting Policies [Line Items]              
Goodwill 46,800     46,800      
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 $32.7 million and $23.8 million at December 31, 2017 and 2016, 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.