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Asset Retirement Obligation (Tables) | 9 Months Ended
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Sep. 30, 2015
Asset Retirement Obligation Disclosure [Abstract] |
Changes to Company's Asset Retirement Obligations | The following table describes the changes to the Company’s asset retirement obligations during the nine months ended September 30, 2015 and 2014 (in thousands):
| Nine Months Ended |
| September 30, |
| 2015 |  |  | 2014 |
Balance at beginning of year | $ | 5,301 |  |  | $ | 4,837 |
Liabilities incurred |  | 322 |  |  |  | 411 |
Liabilities settled |  | (118 | ) |  |  | (68 | )
Accretion expense |  | 129 |  |  |  | 126 |
Revision in estimated costs of plugging oil and natural gas wells |  | — |  |  |  | 19 |
Asset retirement obligation at end of period | $ | 5,634 |  |  | $ | 5,325 |

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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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