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Earnings Per Share (Details) (USD $) In Thousands, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Earnings per share
Net income attributable to U.S. Cellular shareholders	$ 62,140	$ 38,296	$ 172,240	$ 128,292
Weighted average number of shares used in basic earnings per share	84,547	85,992	84,984	86,329
Effect of dilutive securities:
Stock options	86	104	124	80
Restricted stock units	307	332	340	297
Weighted average number of shares used in diluted earnings per share	84,940	86,428	85,448	86,706
Basic earnings per share attributable to U.S. Cellular shareholders	$ 0.73	$ 0.45	$ 2.03	$ 1.49
Diluted earnings per share attributable to U.S. Cellular shareholders	$ 0.73	$ 0.44	$ 2.02	$ 1.48
Common Shares | Stock Options
Effect of dilutive securities:
Antidilutive securities	1,605	1,836	1,357	1,768
Common Shares | Restricted Stock
Effect of dilutive securities:
Antidilutive securities	1		193	195

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