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Earnings Per Share (Tables)
3 Months Ended
Mar. 31, 2015
Earnings Per Share  
Earnings per share
  Three Months Ended
  March 31,
  2015 2014
(Dollars and shares in thousands, except per share amounts)     
Net income attributable to U.S. Cellular shareholders$ 160,064 $ 19,482
       
Weighted average number of shares used in basic earnings per share  84,042   84,213
Effects of dilutive securities:     
 Stock options  157   203
 Restricted stock units  639   649
Weighted average number of shares used in diluted earnings per share  84,838   85,065
       
Basic earnings per share attributable to U.S. Cellular shareholders$ 1.90 $ 0.23
       
Diluted earnings per share attributable to U.S. Cellular shareholders$ 1.89 $ 0.23
Summary of antidilutive shares
  Three Months Ended
  March 31,
  2015 2014
(Shares in thousands)   
Stock options 2,360  1,276