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Asset Retirement Obligation (Tables) | 12 Months Ended
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Dec. 31, 2012
Asset Retirement Obligation [Abstract] |
Schedule of Change in Asset Retirement Obligation [Table Text Block] |
| (In thousands) |  | Years Ended December 31,
|  |  | 2012 |  |  | 2011
Beginning balance | $ | 51,295 |  | $ | 52,099
| Adjustment due to change in estimate of related costs |  | 3,570 |  |  | (3,174)
| Accretion of liability |  | 4,920 |  |  | 5,001
| Liabilities settled |  | (2,936) |  |  | (2,631)
Ending balance | $ | 56,849 |  | $ | 51,295

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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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