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Intangible Assets (Details) (Licenses, USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2014
U.S. Cellular
Mar. 31, 2013
U.S. Cellular
Mar. 31, 2014
Wireline
Dec. 31, 2013
Wireline
Mar. 31, 2013
Wireline
Dec. 31, 2012
Wireline
Mar. 31, 2014
Non-Reportable Segment
Dec. 31, 2013
Non-Reportable Segment
Mar. 31, 2013
Non-Reportable Segment
Dec. 31, 2012
Non-Reportable Segment
Licenses                        
Balance, beginning of period $ 1,423,779 $ 1,480,039 $ 1,405,759 $ 1,462,019 $ 2,800 $ 2,800 $ 2,800 $ 2,800 $ 15,220 $ 15,220 $ 15,220 $ 15,220
Acquisitions 9,100 14,150 9,100 14,150                
Exchanges, net 15,719   15,719                  
Balance, end of period $ 1,448,598 $ 1,494,189 $ 1,430,578 $ 1,476,169 $ 2,800 $ 2,800 $ 2,800 $ 2,800 $ 15,220 $ 15,220 $ 15,220 $ 15,220