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Stockholders' Equity (Tables)
 6 Months Ended
Jun. 30, 2013
Equity [Abstract]  
Activity Relating to Common Shares

The following table summarizes the activity relating to shares of the Company’s common stock during the periods presented (in thousands):

 

     Issued
Shares		     Treasury
Shares		     Outstanding
Shares		  

Balance, as of December 31, 2012

      41,889        (1,018 )      40,871   
  

 

 

    

 

 

    

 

 

  

Shares repurchased

      —          (6,666 )      (6,666 ) 

Options exercised

      1,925        —          1,925   

Restricted stock grant

      850        —          850   

Shares acquired through cashless exercise (1)

      —          (1,683 )      (1,683 ) 

Shares cancelled

      (1,683 )      1,683        —     
  

 

 

    

 

 

    

 

 

  

Balance, as of June 30, 2013

      42,981        (7,684 )      35,297   
  

 

 

    

 

 

    

 

 

  

 

(1) All shares acquired represent shares tendered to cover the strike price for options and tax withholdings on the intrinsic value of options exercised or restricted stock vested. These shares have been cancelled by the Company.