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Asset Retirement Obligation (Tables) | 6 Months Ended
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Jun. 30, 2012
Asset Retirement Obligation [Abstract] |
Asset Retirement Obligation Transactions |
Balance December 31, 2011 | $ | 1,927 |
Accretion expense |  | 67 |
Liabilities incurred |  | 92 |
Liabilities settled |  | (41 | )
Balance June 30, 2012 | $ | 2,045 |

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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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