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Asset Retirement Obligation | 12 Months Ended
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Dec. 31, 2015
Asset Retirement Obligation [Abstract] |
Asset Retirement Obligation | 11. 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, 201 4 and 201 5 (in thousands):
Balance December 31, 2013 |  | $ | 1,780
Accretion expense |  |  | 114
Liabilities incurred |  |  | 46
Liabilities settled |  |  | (70)
Revision in estimated liabilities |  |  | 138
Balance December 31, 2014 |  | $ | 2,008
Accretion expense |  |  | 126
Liabilities incurred |  |  | —
Liabilities settled |  |  | (24)
Revisions in estimated liabilities |  |  | 112
Balance December 31, 2015 |  | $ | 2,222
The revisions in estimated liabilities in 201 5 and 201 4 resulted primarily from change in timing of wells to be plugged.

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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 + Details
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