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Asset Retirement Obligation (Tables) | 12 Months Ended
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Dec. 31, 2014
Asset Retirement Obligation [Abstract] |
Asset Retirement Obligation Transactions |
Balance December 31, 2012 | $ | 2,099 |
Accretion expense |  | 120 |
Liabilities incurred |  | 26 |
Liabilities settled |  | (417 | )
Revision in estimated liabilities |  | (48 | )
Balance December 31, 2013 | $ | 1,780 |
Accretion expense |  | 114 |
Liabilities incurred |  | 46 |
Liabilities settled |  | (70 | )
Revisions in estimated liabilities |  | 138 |
Balance December 31, 2014 | $ | 2,008 |

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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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