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Asset Retirement Obligation (Tables) | 12 Months Ended
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Dec. 31, 2015
Asset Retirement Obligation [Abstract] |
Asset retirement obligations | In 2015 and 2014, U.S. Cellular and TDS Telecom performed a review of the assumptions and estimated costs related to asset retirement obligations. The results of the revie ws (identified as “Revisions in estimated cash outflows”) and other changes in asset retirement obligations during 2015 and 2014 were as follows:
| 2015 |  | 2014
(Dollars in thousands) |  |  |  |  |
Balance at beginning of year | $ | 239,032 |  | $ | 275,238
| Additional liabilities accrued |  | 1,661 |  |  | 4,907
| Revisions in estimated cash outflows |  | (3,669) |  |  | (992)
| Disposition of assets |  | (9,684) |  |  | (46,242)
| Accretion expense |  | 15,735 |  |  | 17,506
| Transferred to Liabilities held for sale |  | – |  |  | (11,385)
Balance at end of year¹ | $ | 243,075 |  | $ | 239,032
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 as of December 31, 2014.

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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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