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Stockholders' Equity (Tables)
3 Months Ended
Mar. 31, 2012
Stockholders' Equity [Abstract]  
Number And Cost Of Common Stock Shares Repurchased
     Three Months Ended
March 31,
 
     2012      2011  

Common stock repurchased (in shares)

     1,017         958   

Common stock repurchased

   $ 29,487       $ 29,529   
Number And Cost Of Employee Stock Plan Repurchases
     Three Months Ended
March 31,
 
     2012      2011  

Employee stock plan repurchased (in shares)

     909         45   

Employee stock plan repurchased

   $ 26,907       $ 1,438   
Cash Dividends Declared
     Three Months Ended
March 31,
 
         2012              2011      

Cash dividends declared per share

   $ .15       $ .14