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Summary Of Significant Accounting Policies (Narrative) (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Summary Of Significant Accounting Policies [Line Items]        
Cash and cash equivalents $ 48,822,000 [1] $ 68,939,000 [1] $ 73,191,000 $ 90,663,000
Investments, percentage of voting ownership interest 50.00%      
Percentage estimated fair value of PET Films exceeded carrying value of net assets 23.00%      
Cumulative amount of untaxed earnings 23,000,000      
Incremental shares excluded from the calculation of incremental shares attributable to stock options and restricted stock 632,050 293,704 324,558  
Foreign Country [Member]
        
Summary Of Significant Accounting Policies [Line Items]        
Cash and cash equivalents $ 28,600,000 $ 42,300,000 $ 35,700,000  
Machinery & Equipment [Member]
        
Summary Of Significant Accounting Policies [Line Items]        
Average useful life 10 years      
Minimum [Member] | Buildings And Land Improvements [Member]
        
Summary Of Significant Accounting Policies [Line Items]        
Average useful life 10 years      
Minimum [Member] | Machinery & Equipment [Member]
        
Summary Of Significant Accounting Policies [Line Items]        
Average useful life 2 years      
Maximum [Member] | Buildings And Land Improvements [Member]
        
Summary Of Significant Accounting Policies [Line Items]        
Average useful life 25 years      
Maximum [Member] | Machinery & Equipment [Member]
        
Summary Of Significant Accounting Policies [Line Items]        
Average useful life 15 years      
Aluminum Extrusions [Member]
        
Summary Of Significant Accounting Policies [Line Items]        
Number of reporting units 2      
[1] Information on exports and foreign operations are provided on the next page. Cash and cash equivalents includes funds held in locations outside the U.S. of $28.6 million, $42.3 million and $35.7 million at December 31, 2012, 2011 and 2010, respectively. Export sales relate almost entirely to Film Products. Operations outside the U.S. in The Netherlands, Hungary, China, Italy (sold in 2011), Brazil and India also relate to Film Products. Sales from our locations in The Netherlands, Hungary and Italy are primarily to customers located in Europe. Sales from our locations in China (Guangzhou and Shanghai) are primarily to customers located in China, but also include other customers in Asia. Sales activity at the new film products manufacturing facility in India were not significant in 2011.