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Stockholders' Equity (Tables)
9 Months Ended
Sep. 30, 2011
Stockholders' Equity [Abstract] 
Number And Cost Of Common Stock Shares Repurchased
     Nine Months Ended
September 30,
 
     2011      2010  

Common stock repurchased (in shares)

     5,021         2,961   

Common stock repurchased

   $ 134,026       $ 76,753   
Number And Cost Of Employee Stock Plan Repurchases
     Nine Months Ended
September 30,
 
     2011      2010  

Employee stock plan repurchased (in shares)

     216         250   

Employee stock plan repurchased

   $ 6,365       $ 6,435   
Cash Dividends Declared
     Nine Months Ended
September 30,
 
     2011      2010  

Cash dividends declared per share

   $ .42       $ .39