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Earnings Per Share (Tables)
3 Months Ended
Mar. 31, 2013
Earnings Per Share Abstract  
Earnings per share
  Three Months Ended March 31,
  2013 2012
(Dollars and shares in thousands, except per share amounts)     
Net income attributable to U.S. Cellular shareholders$ 4,914 $ 62,492
       
Weighted average number of shares used in basic earnings per share  83,838   84,570
Effects of dilutive securities:     
 Stock options  44   135
 Restricted stock units  521   428
Weighted average number of shares used in diluted earnings per share  84,403   85,133
       
Basic earnings per share attributable to U.S. Cellular shareholders$ 0.06 $ 0.74
       
Diluted earnings per share attributable to U.S. Cellular shareholders$ 0.06 $ 0.73
Summary of antidilutive shares
  Three Months Ended March 31,
  2013 2012
(Shares in thousands)   
Stock options 2,468  1,444