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Earnings Per Share (Tables)
 12 Months Ended
Dec. 29, 2018
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 29,
2018		   December 30,
2017		   December 31,
2016		  

Net income

   $ 83,591   $ 47,092   $ 61,494  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Shares used in computing basic earnings per share

     43,159     42,446     41,713  

Effect of dilutive securities:

    
 		    
 		    
 		  

Stock-based awards

     885     886     663  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Shares used in computing diluted earnings per share

     44,044     43,332     42,376  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Earnings per share:

                    

Basic

   $ 1.94   $ 1.11   $ 1.47  

Diluted

   $ 1.90   $ 1.09   $ 1.45