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Asset Retirement Obligations (Tables) | 12 Months Ended
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Dec. 31, 2012
Asset Retirement Obligation [Abstract] |
Reconciliation of the company's asset retirement obligation | A reconciliation of the Company's liability, which is included in other accrued liabilities and other liabilities on the Consolidated Balance Sheets, for the years ended December 31 was as follows:
| 2012 |  | 2011 |
| (In thousands)
Balance at beginning of year | $ | 98,151 |  | $ | 95,970 |
Liabilities incurred | 6,523 |  | 3,870 |
Liabilities acquired | — |  | — |
Liabilities settled | (10,472 | ) | (10,418 | )
Accretion expense | 4,266 |  | 4,466 |
Revisions in estimates | 3,655 |  | 3,921 |
Other | 422 |  | 342 |
Balance at end of year | $ | 102,545 |  | $ | 98,151 |

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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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