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Stockholders' Equity (Tables)
3 Months Ended
Mar. 31, 2018
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,

 

 

    

2018

    

2017

 

Common shares outstanding, end of period

 

37,088

 

37,226

 

Effect of using weighted average common shares outstanding

 

104

 

(1)

 

Shares used in computing earnings per share—basic

 

37,192

 

37,225

 

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

 

317

 

335

 

Effect of restricted and contingently issuable shares

 

119

 

164

 

Shares used in computing earnings per share—diluted

 

37,628

 

37,724