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Asset Retirement Obligations (Tables) | 12 Months Ended
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Dec. 31, 2013
Changes to Asset Retirement Obligation | The following table describes changes to the asset retirement obligation liability (dollars in thousands):
| Year Ended December 31
| 2013 |  | 2012
Asset retirement obligation at beginning of period | $ | 5,145 |  |  | $ | 5,095 |
Acquisition | 23,841 |  |  | — |
Liabilities incurred | 3,164 |  |  | — |
Accretion expense | 275 |  |  | 50 |
Revisions in estimated cash flows | (378 | ) |  | — |
Asset retirement obligation at end of period | $ | 32,047 |  |  | $ | 5,145 |

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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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