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Asset Retirement Obligations (Tables) | 6 Months Ended
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Jun. 30, 2012
Schedule Of Changes In Asset Retirement Obligations |
|  | (In thousands) |
Balance at December 31, 2011 |  | $ | 13,075 |
Liabilities incurred during period |  |  | 2,812 |
Liabilities settled during period |  |  | — |
Accretion expense during period (1) |  |  | 389 |
Revisions to estimates |  |  | 984 |
Balance at June 30, 2012 |  | $ | 17,260 |
(1) | Included in depreciation, depletion and amortization on the Company’s Condensed Consolidated Statement of Operations.

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- Definition Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13201-110859 + Details
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