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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jul. 02, 2016
Jul. 04, 2015
Jul. 02, 2016
Jul. 04, 2015
Earnings Per Share        
Net income $ 15,559 $ 7,575 $ 21,367 $ 13,953
Shares used in computing basic earnings per share (in shares) 41,775 42,823 41,702 42,617
Effect of dilutive securities:        
Stock options and other stock-based awards (in shares) 509 638 540 688
Shares used in computing diluted earnings per share (in shares0 42,284 43,461 42,242 43,305
Earnings per share:        
Basic (in dollars per share) $ 0.37 $ 0.18 $ 0.51 $ 0.33
Diluted (in dollars per share) $ 0.37 $ 0.17 $ 0.51 $ 0.32
Shares excluded from computation of diluted earning per share (in shares) 200 100 300 100