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Summary Of Significant Accounting Policies (Narrative) (Details) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2009
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Summary Of Significant Accounting Policies [Line Items]          
Cash and cash equivalents   $ 52,617,000 [1] $ 48,822,000 [1] $ 68,939,000 $ 73,191,000
Investments, percentage of voting ownership interest   50.00%      
Goodwill, Impairment Loss 30,600,000        
Goodwill Impairment Loss Net Of Tax 30,600,000        
Deferred tax liabilities related to undistributed foreign earnings   7,100,000      
Cumulative amount of untaxed earnings   36,000,000      
Incremental shares excluded from the calculation of incremental shares attributable to stock options and restricted stock   31,167 632,050 293,704  
Foreign Country
          
Summary Of Significant Accounting Policies [Line Items]          
Cash and cash equivalents   $ 38,600,000 $ 28,600,000    
Machinery & equipment
          
Summary Of Significant Accounting Policies [Line Items]          
Average useful life   10 years      
Minimum | Buildings And Land Improvements
          
Summary Of Significant Accounting Policies [Line Items]          
Average useful life   10 years      
Minimum | Machinery & 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   30 years      
Maximum | Machinery & equipment
          
Summary Of Significant Accounting Policies [Line Items]          
Average useful life   17 years      
PET Films
          
Summary Of Significant Accounting Policies [Line Items]          
Percentage estimated fair value of PET Films exceeded carrying value of net assets   37.00%      
Aluminum Extrusions
          
Summary Of Significant Accounting Policies [Line Items]          
Number of reporting units   2      
AACOA
          
Summary Of Significant Accounting Policies [Line Items]          
Percentage estimated fair value of PET Films exceeded carrying value of net assets   22.00%      
[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 $38.6 million and $28.6 million at December 31, 2013 and 2012, 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 was not significant in 2011.