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Stockholders' Equity (Tables)
6 Months Ended
Jun. 30, 2011
Stockholders' Equity  
Number and Cost of Common Stock Shares Repurchased
     Six Months Ended
June 30,
 
     2011      2010  

Common stock repurchased (in shares)

     2,958         2,486   

Common stock repurchased

   $ 85,851       $ 65,569   
Number and Cost of Employee Stock Plan Repurchases
     Six Months Ended
June 30,
 
     2011      2010  

Employee stock plan repurchased (in shares)

     193         240   

Employee stock plan repurchased

   $ 5,694       $ 6,192   
Cash Dividends Declared
     Six Months Ended
June  30,
 
       2011          2010    

Cash dividends declared per share

   $ .28       $ .26