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Consolidated Statements of Operations (Unaudited) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jul. 01, 2012
Jul. 03, 2011
Jul. 01, 2012
Jul. 03, 2011
Revenue        
Product $ 78,449 $ 77,566 $ 149,856 $ 146,443
Service 5,877 5,827 12,179 11,344
Total revenue 84,326 83,393 162,035 157,787
Cost of revenue        
Product 17,635 16,454 33,191 31,553
Service 2,914 2,925 6,416 6,209
Total cost of revenue 20,549 19,379 39,607 37,762
Gross margin        
Product 60,814 61,112 116,665 114,890
Service 2,963 2,902 5,763 5,135
Total gross margin 63,777 64,014 122,428 120,025
Research, development, and engineering expenses 10,300 10,506 20,661 19,988
Selling, general, and administrative expenses 30,127 29,466 60,676 58,627
Operating income 23,350 24,042 41,091 41,410
Foreign currency gain (loss) (30) 210 (668) 151
Investment income 1,801 697 2,773 1,302
Other expense (99) (148) (96) (353)
Income before income tax expense 25,022 24,801 43,100 42,510
Income tax expense 5,255 5,704 9,051 9,777
Net income $ 19,767 $ 19,097 $ 34,049 $ 32,733
Earning per weighted-average common and common-equivalent share:        
Basic $ 0.46 $ 0.46 $ 0.80 $ 0.79
Diluted $ 0.45 $ 0.45 $ 0.78 $ 0.77
Weighted-average common and common-equivalent shares outstanding:        
Basic 42,851 41,842 42,710 41,586
Diluted 43,601 42,810 43,599 42,532
Cash dividends per common share $ 0.11 $ 0.09 $ 0.21 $ 0.17