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Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2012 | Oct. 02, 2011 | Sep. 30, 2012 | Oct. 02, 2011
Revenue |  |  |  |
Product | $ 72,437 | $ 74,165 | $ 222,293 | $ 220,608
Service | 7,639 | 5,920 | 19,818 | 17,264
Total revenue | 80,076 | 80,085 | 242,111 | 237,872
Cost of revenue |  |  |  |
Product | 15,863 | 15,705 | 49,054 | 47,258
Service | 3,643 | 3,248 | 10,059 | 9,457
Total cost of revenue | 19,506 | 18,953 | 59,113 | 56,715
Gross margin |  |  |  |
Product | 56,574 | 58,460 | 173,239 | 173,350
Service | 3,996 | 2,672 | 9,759 | 7,807
Total gross margin | 60,570 | 61,132 | 182,998 | 181,157
Research, development, and engineering expenses | 10,002 | 10,608 | 30,663 | 30,596
Selling, general, and administrative expenses | 28,765 | 28,135 | 89,441 | 86,762
Operating income | 21,803 | 22,389 | 62,894 | 63,799
Foreign currency loss | (409) | (231) | (1,077) | (80)
Investment income | 823 | 917 | 3,596 | 2,219
Other expense | (131) | (156) | (227) | (509)
Income before income tax expense | 22,086 | 22,919 | 65,186 | 65,429
Income tax expense | 4,281 | 4,882 | 13,332 | 14,659
Net income | $ 17,805 | $ 18,037 | $ 51,854 | $ 50,770
Earnings per weighted-average common and common-equivalent share: |  |  |  |
Basic | $ 0.42 | $ 0.43 | $ 1.21 | $ 1.22
Diluted | $ 0.41 | $ 0.42 | $ 1.19 | $ 1.19
Weighted-average common and common-equivalent shares outstanding: |  |  |  |
Basic | 42,912 | 42,128 | 42,777 | 41,765
Diluted | 43,629 | 42,976 | 43,610 | 42,682
Cash dividends per common share | $ 0.11 | $ 0.09 | $ 0.32 | $ 0.26

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