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Asset Retirement Obligation (Tables) | 3 Months Ended
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Mar. 31, 2013
Asset Retirement Obligation [Abstract] |
Schedule of asset retirement obligation |
In thousands |  | 2013 |  |  | 2012 |
Balance at January 1, |  | $ | 8,882 |  |  | $ | 9,679 |
Accretion |  |  | 82 |  |  |  | 122 |
Payments |  |  | (662 | ) |  |  | (207 | )
Balance at March 31, |  | $ | 8,302 |  |  | $ | 9,594 |

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- Definition Tabular disclosure of the carrying amount of a liability for asset retirement obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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