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Consolidated Statements of Income (Unaudited) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 27, 2014
Sep. 28, 2013
Sep. 27, 2014
Sep. 28, 2013
Total revenue $ 143,497 $ 124,501 $ 397,504 $ 361,058
Total cost of revenue 75,608 70,440 215,784 198,865
Gross margin 67,889 54,061 181,720 162,193
Operating expenses:        
Research and development 17,343 15,212 51,522 [1] 45,617 [1]
Selling and marketing 15,844 16,317 53,911 [1] 49,323 [1]
General and administrative 12,008 11,495 35,938 [1] 39,348 [1]
Total operating expenses 45,195 43,024 141,371 134,288
Operating income 22,694 11,037 40,349 27,905
Other income (expense), net (374) 152 (469) (49)
Income before income taxes 22,320 11,189 39,880 27,856
Income tax expense 7,713 3,385 11,463 3,403
Net income 14,607 7,804 28,417 24,453
Net income per share        
Basic, in dollars per share $ 0.49 $ 0.27 $ 0.97 $ 0.86
Diluted, in dollars per share $ 0.48 $ 0.26 $ 0.94 $ 0.84
Number of shares used in calculations per share        
Basic, in shares 29,595 28,733 29,439 28,359
Diluted, in shares 30,183 29,582 30,169 29,207
Stock-based compensation     10,016 9,669
Cost of Sales [Member]
        
Number of shares used in calculations per share        
Stock-based compensation 291 250 626 496
Research and development
        
Number of shares used in calculations per share        
Stock-based compensation 866 669 2,425 1,963
Selling and marketing
        
Number of shares used in calculations per share        
Stock-based compensation 319 348 860 832
General and administrative
        
Number of shares used in calculations per share        
Stock-based compensation $ 2,315 $ 2,210 $ 6,105 $ 6,378
[1] Total stock-based compensation recorded in the three and nine months ended September 27, 2014 and September 28, 2013 included in the above figures breaks down by expense classification as follows: Three Months Ended Nine Months Ended September 27, 2014 September 28, 2013 September 27, 2014 September 28, 2013Cost of revenue$291 $250 $626 $496Research and development866 669 2,425 1,963Selling and marketing319 348 860 832General and administrative2,315 2,210 6,105 6,378