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Condensed Consolidated Statements of Income - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended
Apr. 01, 2017
Apr. 02, 2016
Condensed Consolidated Statements of Income    
Revenues $ 179,028 $ 162,025
Cost of revenues 73,867 66,494
Gross margin 105,161 95,531
Operating expenses:    
Research and development 52,324 49,046
Selling, general and administrative 40,155 39,637
Operating expenses 92,479 88,683
Operating income 12,682 6,848
Other income (expense):    
Interest income 696 271
Interest expense 198 (655)
Other, net (120) (391)
Income before income taxes 13,456 6,073
Provision (benefit) for income taxes (1,970) 265
Net income $ 15,426 $ 5,808
Earnings per share:    
Basic (in dollars per share) $ 0.37 $ 0.14
Diluted (in dollars per share) $ 0.36 $ 0.14
Weighted-average common shares outstanding:    
Basic (in shares) 42,096 41,629
Diluted (in shares) 43,030 42,199