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Asset Retirement Obligations (Tables) | 12 Months Ended
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Dec. 31, 2011
Asset Retirement Obligation [Abstract] |
Reconciliation of the Company's Asset Retirement Obligation | A reconciliation of the Company's liability, which is included in other liabilities, for the years ended December 31 was as follows:
| 2011 |  |  | 2010 |
| (In thousands)
Balance at beginning of year | $ | 95,970 |  |  | $ | 76,359 |
Liabilities incurred | 3,870 |  |  | 8,608 |
Liabilities acquired | — |  |  | 5,272 |
Liabilities settled | (10,418 | ) |  | (10,740 | )
Accretion expense | 4,466 |  |  | 3,588 |
Revisions in estimates | 3,921 |  |  | 12,621 |
Other | 342 |  |  | 262 |
Balance at end of year | $ | 98,151 |  |  | $ | 95,970 |

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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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