Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Earnings per share
Net income attributable to U.S. Cellular shareholders	$ 4,914	$ 62,492
Weighted average number of shares used in basic earnings per share
Weighted average number of shares used in basic earnings per share	83,838	84,570
Effect 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
Common Shares \| Stock Options Member
Effect of dilutive securities:
Antidilutive securities	2,468	1,444

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