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Asset Retirement Obligation | 12 Months Ended
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Dec. 31, 2012
Asset Retirement Obligation [Abstract] |
Asset Retirement Obligation | 12. Asset Retirement Obligation Our asset retirement obligations represent the estimated present value of the amount we will incur to plug, abandon and remediate our producing properties at the end of their productive lives in accordance with applicable laws. The following table summarizes the Company's Asset Retirement Obligation transactions for the years ended December 31, 2011 and 2012: (in thousands):
Balance December 31, 2010 | $ | 1,437 |
Accretion expense |  | 96 |
Liabilities incurred |  | 57 |
Liabilities settled |  | (165 | )
Revision in estimated liabilities |  | 502 |
Balance December 31, 2011 | $ | 1,927 |
Accretion expense |  | 132 |
Liabilities incurred |  | 92 |
Liabilities settled |  | (52 | )
Revisions in estimated liabilities |  | - |
Balance December 31, 2012 | $ | 2,099 |
The revisions in estimated liabilities in 2011 resulted primarily from increasing estimated plugging cost on Kansas and Tennessee wells based on the actual cost incurred on the wells plugged in 2010 and 2011.

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- Definition The entire disclosure for an asset retirement obligation and the associated long-lived asset. An asset retirement obligation is a legal obligation associated with the disposal or retirement from service of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7569-110849 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 143 -Paragraph 22 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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