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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2013
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):

 
   Year Ended December 31,  
 
   2013   2012   2011  

Common shares outstanding, end of period(a)

     37,578     37,069     37,050  

Effect of using weighted average common shares outstanding

     (333 )   43     339  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Shares used in computing earnings per share—basic

     37,245     37,112     37,389  

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

     183     87     —  

Effect of contingently issuable restricted shares

     108     60     —  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Shares used in computing earnings per share—diluted

     37,536     37,259     37,389  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
               
(a)
Excludes 0.1 million, 0.2 million and 0.4 million shares of unvested contingently issuable restricted stock outstanding for the years ended December 31, 2013, 2012 and 2011, respectively (see Note 14 "Stock-Based Compensation").