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Earnings Per Share (Tables)
12 Months Ended
Dec. 31, 2010
Earnings per share 
Earnings per share
            
 Year ended December 31, 2010 2009 2008
 (Dollars and shares in thousands,       
  except earnings per share)         
 Net income attributable to U.S. Cellular shareholders $136,074 $209,547 $35,705
            
 Weighted average number of shares used        
  in basic earnings per share  86,128  86,946 87,457
 Effect of dilutive securities:         
  Stock options  89  21  150
  Restricted stock units  301  201  147
 Weighted average number of shares used         
  in diluted earnings per share  86,518  87,168  87,754
            
 Basic earnings per share attributable to         
  U.S. Cellular shareholders $1.58 $2.41 $0.41
            
 Diluted earnings per share attributable to         
  U.S. Cellular shareholders $1.57 $2.40 $0.41
Summary of antidilutive shares 
Summary of antidilutive shares
    2010 2009 2008
 (Shares in thousands)     
 Stock options 1,771 2,045 1,103
         
 Restricted stock units 224 193 176