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Asset Retirement Obligation (Tables) | 12 Months Ended
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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.

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- Definition Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13201-110859 + Details
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