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Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2015
Mar. 31, 2009
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
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     300 400 $ 1,100  
Foreign Currency Transaction Gain (Loss), before Tax     3,600 (4,000) (1,500)  
Cash and cash equivalents     $ 29,511 [1] 44,156 [1] 50,056 $ 52,617
Investments, percentage of voting ownership interest     50.00%      
Goodwill, Impairment Loss     $ 0 $ 44,465 $ 0  
Incremental shares excluded from the calculation of incremental shares attributable to stock options and restricted stock     128,200 881,513 320,849  
Foreign Country            
Summary Of Significant Accounting Policies [Line Items]            
Cash and cash equivalents     $ 23,800 $ 27,700    
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      
Flexible Packaging Films [Member] [Domain]            
Summary Of Significant Accounting Policies [Line Items]            
Goodwill, Impairment Loss $ 44,500   $ 0 $ 44,465 $ 0  
Goodwill, Impairment Loss, Net of Tax $ 44,500          
Aluminum Extrusions            
Summary Of Significant Accounting Policies [Line Items]            
Goodwill, Impairment Loss   $ 30,600        
PE Films [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Goodwill Fair Value in Excess of NBV     30.00%      
Surface protection films            
Summary Of Significant Accounting Policies [Line Items]            
Goodwill Fair Value in Excess of NBV     48.00%      
Flexible Packaging Films [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Indefinite Lived Intangibles Fair Value in Excess of NBV     20.00%      
[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 $23.8 million and $27.7 million at December 31, 2016 and 2015, 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.