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Asset Retirement Obligations (Table) | 12 Months Ended
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Dec. 31, 2014
Asset Retirement Obligations |
Asset retirement obligations |
(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 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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