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Asset Retirement Obligation (Tables)
 12 Months Ended
Dec. 31, 2014
Asset Retirement Obligation [Abstract]  
Asset retirement obligations
              
    U.S. TDS   TDS
(Dollars in thousands) Cellular Telecom Other Consolidated
Balance December 31, 2013 $ 195,568 $ 75,395 $ 4,275 $ 275,238
 Additional liabilities accrued   2,507   2,400   -   4,907
 Revisions in estimated cash outflows   (2,792)   1,777   23   (992)
 Disposition of assets   (44,403)   (882)   (957)   (46,242)
 Accretion expense   12,534   4,723   249   17,506
 Transferred to Liabilities held for sale   (10,902)   (177)   (306)   (11,385)
Balance December 31, 2014 (1) $ 152,512 $ 83,236 $ 3,284 $ 239,032
               
Balance December 31, 2012 $ 179,607 $ 69,969 $ 4,034 $ 253,610
 Additional liabilities accrued   635   3,667   -   4,302
 Revisions in estimated cash outflows   6,268   (2,562)   -   3,706
 Disposition of assets   (3,534)   (577)   -   (4,111)
 Accretion expense   12,592   4,898   241   17,731
Balance December 31, 2013 (1) $ 195,568 $ 75,395 $ 4,275 $ 275,238
               
(1)The total amount of asset retirement obligations related to the Divestiture Transaction and Airadigm Transaction included in Other current liabilities was $9.1 million and $37.7 million as of December 31, 2014 and 2013, respectively.