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Earnings Per Share (Tables)
9 Months Ended
Sep. 30, 2012
Earnings Per Share Abstract  
Earnings per share
  Three Months Ended Nine Months Ended
  September 30, September 30,
  2012 2011 2012 2011
(Dollars and shares in thousands, except per share amounts)           
Net income attributable to U.S. Cellular shareholders$ 35,451 $ 62,140 $ 150,628 $ 172,240
             
Weighted average number of shares used in basic earnings per share  84,737   84,547   84,671   84,984
Effects of dilutive securities:           
 Stock options  57   86   63   124
 Restricted stock units  358   307   356   340
Weighted average number of shares used in diluted earnings per share  85,152   84,940   85,090   85,448
             
Basic earnings per share attributable to U.S. Cellular shareholders$ 0.42 $ 0.73 $ 1.78 $ 2.03
             
Diluted earnings per share attributable to U.S. Cellular shareholders$ 0.42 $ 0.73 $ 1.77 $2.02
Summary of antidilutive shares
 Three Months Ended Nine Months Ended
  September 30, September 30,
  2012 2011 2012 2011
(Shares in thousands)       
Stock options 2,565  1,605  2,426  1,357
         
Restricted stock units -  1  283  193