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Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
segment
Sep. 30, 2011
Dec. 31, 2011
Dec. 31, 2010
Segment Information            
Number of reportable segments     3      
Segment Information            
Net sales $ 172,113 $ 162,366 $ 512,550 $ 472,713    
Sales to Other Segments 4,968 4,443 16,232 11,660    
Income (Loss) from Operations 21,990 24,882 62,647 68,373    
Total Assets 878,996 855,469 878,996 855,469 836,087  
Cash and short-term investments 187,471 265,162 187,471 265,162 213,817 335,049
North America
            
Segment Information            
Net sales 137,145 127,998 409,644 371,732    
Sales to Other Segments 969 1,093 3,783 3,905    
Income (Loss) from Operations 22,102 23,594 66,558 69,463    
Total Assets 568,878 608,350 568,878 608,350 540,082  
Europe
            
Segment Information            
Net sales 31,880 31,761 94,236 93,206    
Sales to Other Segments 105   258 250    
Income (Loss) from Operations 1,172 2,801 889 3,997    
Total Assets 196,883 131,138 196,883 131,138 180,016  
Asia/Pacific
            
Segment Information            
Net sales 2,851 2,370 7,958 7,062    
Sales to Other Segments 3,894 3,350 12,191 7,505    
Income (Loss) from Operations (1,043) (410) (1,860) (1,674)    
Total Assets 31,067 28,349 31,067 28,349 29,306  
Administrative and all other
            
Segment Information            
Net sales 237 237 712 713    
Income (Loss) from Operations (241) (1,103) (2,940) (3,413)    
Total Assets 82,168 87,632 82,168 87,632 86,683  
Cash and short-term investments $ 107,300 $ 177,500 $ 107,300 $ 177,500 $ 68,500