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Segment Data (Details)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Segment Data      
Number of distinct segments 2    
Revenues | Sales risk | Component Products
     
Concentration of risk      
Percentage of concentration risk 5.20% 5.70% 10.90%
Revenues | Sales risk | Packaging
     
Concentration of risk      
Percentage of concentration risk 10.40% 8.80% 6.90%
Total Sales | Sales risk | Component Products
     
Concentration of risk      
Percentage of concentration risk 3.50% 3.80% 7.20%
Total Sales | Sales risk | Packaging
     
Concentration of risk      
Percentage of concentration risk 3.40% 2.90% 2.30%