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Asset Retirement Obligations (Tables) | 12 Months Ended
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Dec. 31, 2011
Asset Retirement Obligations [Abstract] |
Components Of Changes In Asset Retirement Obligation Liability |
|  | 2011 |  |  | 2010 |
|  | (In thousands) |
Asset retirement obligation, January 1 |  | $ | 4,884 |  |  | $ | 4,521 |
Accretion expense |  |  | 211 |  |  |  | 363 |
Payments |  |  | — |  |  |  | — |
Asset retirement obligation, December 31 |  | $ | 5,095 |  |  | $ | 4,884 |

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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 -Topic 410 -SubTopic 30 -Publisher FASB -Number -Article -Subparagraph -Name Accounting Standards Codification -Paragraph 5 -Section 50 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13201-110859 + Details
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