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Asset Retirement Obligation | 12 Months Ended
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Dec. 31, 2014
Disclosure Text Block |
Asset Retirement Obligation | NOTE 10 ASSET RETIREMENT OBLIGATIONS U.S. Cellular is subject to asset retirement obligations associated with its leased cell sites, switching office sites, retail store sites and office locations in its operating markets. Asset retirement obligations generally include obligations to restore leased land and retail store and office premises to their pre-lease conditions. These obligations are included in Other deferred liabilities and credits and Other current liabilities in the Consolidated Balance Sheet. In 2014 and 2013, U.S. Cellular performed a review of the assumptions and estimated costs related to its asset retirement obligations. The results of the reviews (identified as “Revisions in estimated cash outflows”) and other changes in asset retirem ent obligations during 2014 and 2013 were as follows:
(Dollars in thousands) | 2014 |  | 2013
Balance, beginning of period | $ | 195,568 |  | $ | 179,607
| Additional liabilities accrued |  | 2,507 |  |  | 635
| Revisions in estimated cash outflows |  | (2,792) |  |  | 6,268
| Disposition of assets |  | (44,403) |  |  | (3,534)
| Accretion expense |  | 12,534 |  |  | 12,592
| Transferred to Liabilities held for sale |  | (10,902) |  |  | -
Balance, end of period (1) | $ | 152,512 |  | $ | 195,568
(1) | The total amount of asset retirement obligations related to the Divestiture Transaction included in Other current liabilities was $5.9 million and $37.7 million as of December 31, 2014 and 2013, respectively.

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- Definition The entire disclosure for an asset retirement obligation and the associated long-lived asset. An asset retirement obligation is a legal obligation associated with the disposal or retirement from service of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7569-110849 + Details
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