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Stockholders' Equity (Tables)
3 Months Ended
Mar. 31, 2016
Stockholders' Equity  
Reconciliation of number of shares outstanding with the number of shares used in computing basic and diluted earnings per share

 

        The following table reconciles the number of shares outstanding with the number of shares used in computing basic and diluted earnings per share for each of the periods presented (in thousands):

                                                                                                                                                                                    

 

 

Three Months Ended
March 31,

 

 

 

2016

 

2015

 

Common shares outstanding, end of period

 

 

37,392

 

 

37,307

 

Effect of using weighted average common shares outstanding

 

 

(48

)

 

(26

)

​  

​  

​  

​  

Shares used in computing earnings per share—basic

 

 

37,344

 

 

37,281

 

Effect of shares issuable under stock option plans based on the treasury stock method

 

 

241

 

 

233

 

Effect of contingently issuable restricted shares

 

 

145

 

 

91

 

​  

​  

​  

​  

Shares used in computing earnings per share—diluted

 

 

37,730

 

 

37,605

 

​  

​  

​  

​  

​  

​  

​  

​