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Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
segment
Mar. 31, 2011
Dec. 31, 2011
Dec. 31, 2010
Segment Information        
Number of reportable segments 3      
Segment Information        
Net sales $ 158,734 $ 132,536    
Sales to Other Segments 5,230 3,514    
Income (Loss) from Operations 13,508 12,283    
Total Assets 867,011 883,170 836,087  
Cash and short-term investments 160,092 301,231 213,817 335,049
North America
        
Segment Information        
Net sales 127,967 104,622    
Sales to Other Segments 1,372 1,322    
Income (Loss) from Operations 17,873 15,091    
Total Assets 546,112 566,939 540,082  
Europe
        
Segment Information        
Net sales 28,237 25,798    
Sales to Other Segments 134 81    
Income (Loss) from Operations (2,372) (1,454)    
Total Assets 201,721 135,146 180,016  
Asia/Pacific
        
Segment Information        
Net sales 2,372 1,877    
Sales to Other Segments 3,724 2,111    
Income (Loss) from Operations (654) (712)    
Total Assets 27,916 24,856 29,306  
Administrative and all other
        
Segment Information        
Net sales 158 239    
Income (Loss) from Operations (1,339) (642)    
Total Assets 91,262 156,229 86,683  
Cash and short-term investments $ 87,400 $ 237,900 $ 68,500