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Business Segments (Schedule Of Net Sales By Product Group) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Revenue from External Customer [Line Items]      
Net Sales by Product Group $ 857,342 [1],[2] $ 775,932 [1],[2] $ 720,388 [1],[2]
Personal Care Materials [Member] | Film Products [Member]
      
Revenue from External Customer [Line Items]      
Net Sales by Product Group 327,161 352,376 358,597
Flexible Packaging Films [Member] | Film Products [Member]
      
Revenue from External Customer [Line Items]      
Net Sales by Product Group 138,028 28,256  
Surface Protection Films [Member] | Film Products [Member]
      
Revenue from External Customer [Line Items]      
Net Sales by Product Group 69,627 69,452 85,451
Polyethylene Overwrap And Polypropylene Films [Member] | Film Products [Member]
      
Revenue from External Customer [Line Items]      
Net Sales by Product Group 63,796 67,282 61,148
Films For Other Markets [Member] | Film Products [Member]
      
Revenue from External Customer [Line Items]      
Net Sales by Product Group 13,265 18,174 15,553
Subtotal [Member] | Film Products [Member]
      
Revenue from External Customer [Line Items]      
Net Sales by Product Group 611,877 535,540 520,749
Nonresidential Building & Construction [Member] | Aluminum Extrusions [Member]
      
Revenue from External Customer [Line Items]      
Net Sales by Product Group 165,159 166,229 134,467
Residential Building & Construction [Member] | Aluminum Extrusions [Member]
      
Revenue from External Customer [Line Items]      
Net Sales by Product Group 23,555 31,444 29,554
Distribution [Member] | Aluminum Extrusions [Member]
      
Revenue from External Customer [Line Items]      
Net Sales by Product Group 15,227 14,700 9,793
Consumer Durables [Member] | Aluminum Extrusions [Member]
      
Revenue from External Customer [Line Items]      
Net Sales by Product Group 12,259 4,784 3,532
Transportation [Member] | Aluminum Extrusions [Member]
      
Revenue from External Customer [Line Items]      
Net Sales by Product Group 11,757 13,176 15,058
Machinery & Equipment [Member] | Aluminum Extrusions [Member]
      
Revenue from External Customer [Line Items]      
Net Sales by Product Group 8,773 5,665 2,571
Electrical [Member] | Aluminum Extrusions [Member]
      
Revenue from External Customer [Line Items]      
Net Sales by Product Group 6,140 4,394 4,664
Other [Member] | Aluminum Extrusions [Member]
      
Revenue from External Customer [Line Items]      
Net Sales by Product Group 2,595    
Subtotal [Member] | Aluminum Extrusions [Member]
      
Revenue from External Customer [Line Items]      
Net Sales by Product Group $ 245,465 $ 240,392 $ 199,639
[1] The difference between total consolidated sales as reported in the consolidated statements of income and segment and geographic net sales reported in this note is freight of $24.8 million in 2012, $18.5 million in 2011 and $17.8 million in 2010.
[2] 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.