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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, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Summary Of Significant Accounting Policies [Line Items]            
Deferred Finance Costs, Net     $ 700 $ 1,100    
Interest Costs Capitalized     400 1,100 $ 900  
Foreign Currency Transaction Gain (Loss), before Tax     (4,000) (1,500) (400)  
Cash and cash equivalents     $ 44,156 [1] 50,056 [1] 52,617 $ 48,822
Investments, percentage of voting ownership interest     50.00%      
Goodwill, Impairment Loss     $ 44,465 $ 0 $ 0  
Incremental shares excluded from the calculation of incremental shares attributable to stock options and restricted stock     881,513 320,849 31,167  
Foreign Country            
Summary Of Significant Accounting Policies [Line Items]            
Cash and cash equivalents     $ 27,700 $ 40,500    
Minimum | Buildings And Land Improvements            
Summary Of Significant Accounting Policies [Line Items]            
Average useful life     5 years      
Minimum | Automotive            
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 | Automotive            
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 $ 44,465   $ 44,465 $ 0 $ 0  
Goodwill, Impairment Loss, Net of Tax $ 44,500          
Aluminum Extrusions            
Summary Of Significant Accounting Policies [Line Items]            
Goodwill, Impairment Loss   $ 30,600 $ 0      
[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 $27.7 million and $40.5 million at December 31, 2015 and 2014, 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.