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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2016
Earnings Per Share  
Schedule of computation of basic and diluted earnings per share

        The following table sets forth the computation of basic and diluted earnings per share (in thousands, except per share data):

 
   Year Ended  
 
   December 31,
2016		   January 2,
2016		   January 3,
2015		  

Net income

   $ 61,494   $ 29,586   $ 38,021  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Shares used in computing basic earnings per share

     41,713     42,309     42,970  

Effect of dilutive securities:

    
 		    
 		    
 		  

Stock options and other stock-based awards

     663     636     823  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Shares used in computing diluted earnings per share

     42,376     42,945     43,793  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Earnings per share:

                    

Basic

   $ 1.47   $ 0.70   $ 0.88  

Diluted

   $ 1.45   $ 0.69   $ 0.87