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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Earnings per share
Net income (loss) attributable to U.S. Cellular shareholders	$ 19,352	$ (18,789)	$ 179,416	$ 693
Weighted average number of shares used in basic earnings (loss) per share
Weighted average number of shares used in basic earnings (loss) per share	84,293	84,341	84,168	84,277
Effects of dilutive securities:
Stock options	166		159	193
Restricted stock units	433		522	571
Weighted average number of shares used in diluted earnings (loss) per share	84,892	84,341	84,849	85,041
Earnings per share, Other disclosures
Basic earnings (loss) per share attributable to U.S. Cellular shareholders	$ 0.23	$ (0.22)	$ 2.13	$ 0.01
Diluted earnings (loss) per share attributable to U.S. Cellular shareholders	$ 0.23	$ (0.22)	$ 2.11	$ 0.01
Stock Options
Earnings per share, Other disclosures
Antidilutive securities	3,539	3,559	2,953	1,820
Restricted Stock Units
Earnings per share, Other disclosures
Antidilutive securities	85	1,191	205	141

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