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Asset Retirement Obligations (Tables) | 6 Months Ended
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Jun. 30, 2013
Asset Retirement Obligations |
| Six Months Ended June 30, 2013 |
Beginning of period | $ |  | 146,478 |
Liabilities incurred |  | 3,846 |
Liabilities settled |  | (155 | )
Disposition of wells |  | (3,098 | )
Accretion expense |  | 5,324 |
Change in estimate |  | (6,231 | )
End of period |  | 146,164 |
Less current portion |  | (2,366 | )
Long-term asset retirement obligations | $ |  | 143,798 |

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- Definition Tabular disclosure of the carrying amount of a liability for asset retirement obligations. + 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 + Details
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Namespace Prefix: | us-gaap_
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Period Type: | duration