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Asset Retirement Obligation (Tables) | 6 Months Ended
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Jun. 30, 2013
Changes to Company's Asset Retirement Obligations | The following table describes the changes to the Company’s asset retirement obligations during the six months ended June 30, 2013 and 2012 (in thousands):
|  | Six Months Ended June 30, |
|  | 2013 |  |  | 2012 |
Balance at beginning of year |  | $ | 4,422 |  |  | $ | 3,455 |
Liabilities incurred |  |  | 177 |  |  |  | 182 |
Liabilities settled |  |  | (31 | ) |  |  | (83 | )
Accretion expense |  |  | 82 |  |  |  | 79 |
Revision in estimated costs of plugging oil and natural gas wells |  |  | — |  |  |  | 536 |
Asset retirement obligation at end of period |  | $ | 4,650 |  |  | $ | 4,169 |

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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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