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Asset Retirement Obligations (Tables) | 12 Months Ended
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Dec. 31, 2013
Estimated Fair Value of Company's Asset Retirement Obligations | A summary of the recording of the estimated fair value of the Company’s asset retirement obligations is presented as follows:
(In Thousands) | Year Ended December 31, |
| 2013 |  |  | 2012 |  |  | 2011 |
Balances at January 1, | $ | 10,368 |  |  | $ | 14,528 |  |  | $ | 13,425 |
Accretion Expense |  | 643 |  |  |  | 814 |  |  |  | 1,014 |
Additions |  | 453 |  |  |  | 770 |  |  |  | 96 |
Revisions |  | 0 |  |  |  | (5,744 | ) |  |  | (7 | )
Balance December 31, | $ | 11,464 |  |  | $ | 10,368 |  |  | $ | 14,528 |

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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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